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android/tools/love.app/Contents/Frameworks/Theora.framework/Headers/codec.h Normal file
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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\mainpage
*
* \section intro Introduction
*
* This is the documentation for <tt>libtheora</tt> C API.
* The current reference
* implementation for <a href="http://www.theora.org/">Theora</a>, a free,
* patent-unencumbered video codec.
* Theora is derived from On2's VP3 codec with additional features and
* integration with Ogg multimedia formats by
* <a href="http://www.xiph.org/">the Xiph.Org Foundation</a>.
* Complete documentation of the format itself is available in
* <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>.
*
* \subsection Organization
*
* The functions documented here are actually subdivided into three
* separate libraries:
* - <tt>libtheoraenc</tt> contains the encoder interface,
* described in \ref encfuncs.
* - <tt>libtheoradec</tt> contains the decoder interface and
* routines shared with the encoder.
* You must also link to this if you link to <tt>libtheoraenc</tt>.
* The routines in this library are described in \ref decfuncs and
* \ref basefuncs.
* - <tt>libtheora</tt> contains the \ref oldfuncs.
*
* New code should link to <tt>libtheoradec</tt> and, if using encoder
* features, <tt>libtheoraenc</tt>. Together these two export both
* the standard and the legacy API, so this is all that is needed by
* any code. The older <tt>libtheora</tt> library is provided just for
* compatibility with older build configurations.
*
* In general the recommended 1.x API symbols can be distinguished
* by their <tt>th_</tt> or <tt>TH_</tt> namespace prefix.
* The older, legacy API uses <tt>theora_</tt> or <tt>OC_</tt>
* prefixes instead.
*/
/**\file
* The shared <tt>libtheoradec</tt> and <tt>libtheoraenc</tt> C API.
* You don't need to include this directly.*/
#if !defined(_O_THEORA_CODEC_H_)
# define _O_THEORA_CODEC_H_ (1)
# include <ogg/ogg.h>
#if defined(__cplusplus)
extern "C" {
#endif
/**\name Return codes*/
/*@{*/
/**An invalid pointer was provided.*/
#define TH_EFAULT (-1)
/**An invalid argument was provided.*/
#define TH_EINVAL (-10)
/**The contents of the header were incomplete, invalid, or unexpected.*/
#define TH_EBADHEADER (-20)
/**The header does not belong to a Theora stream.*/
#define TH_ENOTFORMAT (-21)
/**The bitstream version is too high.*/
#define TH_EVERSION (-22)
/**The specified function is not implemented.*/
#define TH_EIMPL (-23)
/**There were errors in the video data packet.*/
#define TH_EBADPACKET (-24)
/**The decoded packet represented a dropped frame.
The player can continue to display the current frame, as the contents of the
decoded frame buffer have not changed.*/
#define TH_DUPFRAME (1)
/*@}*/
/**The currently defined color space tags.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Chapter 4, for exact details on the meaning
* of each of these color spaces.*/
typedef enum{
/**The color space was not specified at the encoder.
It may be conveyed by an external means.*/
TH_CS_UNSPECIFIED,
/**A color space designed for NTSC content.*/
TH_CS_ITU_REC_470M,
/**A color space designed for PAL/SECAM content.*/
TH_CS_ITU_REC_470BG,
/**The total number of currently defined color spaces.*/
TH_CS_NSPACES
}th_colorspace;
/**The currently defined pixel format tags.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 4.4, for details on the precise sample
* locations.*/
typedef enum{
/**Chroma decimation by 2 in both the X and Y directions (4:2:0).
The Cb and Cr chroma planes are half the width and half the
height of the luma plane.*/
TH_PF_420,
/**Currently reserved.*/
TH_PF_RSVD,
/**Chroma decimation by 2 in the X direction (4:2:2).
The Cb and Cr chroma planes are half the width of the luma plane, but full
height.*/
TH_PF_422,
/**No chroma decimation (4:4:4).
The Cb and Cr chroma planes are full width and full height.*/
TH_PF_444,
/**The total number of currently defined pixel formats.*/
TH_PF_NFORMATS
}th_pixel_fmt;
/**A buffer for a single color plane in an uncompressed image.
* This contains the image data in a left-to-right, top-down format.
* Each row of pixels is stored contiguously in memory, but successive
* rows need not be.
* Use \a stride to compute the offset of the next row.
* The encoder accepts both positive \a stride values (top-down in memory)
* and negative (bottom-up in memory).
* The decoder currently always generates images with positive strides.*/
typedef struct{
/**The width of this plane.*/
int width;
/**The height of this plane.*/
int height;
/**The offset in bytes between successive rows.*/
int stride;
/**A pointer to the beginning of the first row.*/
unsigned char *data;
}th_img_plane;
/**A complete image buffer for an uncompressed frame.
* The chroma planes may be decimated by a factor of two in either
* direction, as indicated by th_info#pixel_fmt.
* The width and height of the Y' plane must be multiples of 16.
* They may need to be cropped for display, using the rectangle
* specified by th_info#pic_x, th_info#pic_y, th_info#pic_width,
* and th_info#pic_height.
* All samples are 8 bits.
* \note The term YUV often used to describe a colorspace is ambiguous.
* The exact parameters of the RGB to YUV conversion process aside, in
* many contexts the U and V channels actually have opposite meanings.
* To avoid this confusion, we are explicit: the name of the color
* channels are Y'CbCr, and they appear in that order, always.
* The prime symbol denotes that the Y channel is non-linear.
* Cb and Cr stand for "Chroma blue" and "Chroma red", respectively.*/
typedef th_img_plane th_ycbcr_buffer[3];
/**Theora bitstream information.
* This contains the basic playback parameters for a stream, and corresponds to
* the initial 'info' header packet.
* To initialize an encoder, the application fills in this structure and
* passes it to th_encode_alloc().
* A default encoding mode is chosen based on the values of the #quality and
* #target_bitrate fields.
* On decode, it is filled in by th_decode_headerin(), and then passed to
* th_decode_alloc().
*
* Encoded Theora frames must be a multiple of 16 in size;
* this is what the #frame_width and #frame_height members represent.
* To handle arbitrary picture sizes, a crop rectangle is specified in the
* #pic_x, #pic_y, #pic_width and #pic_height members.
*
* All frame buffers contain pointers to the full, padded frame.
* However, the current encoder <em>will not</em> reference pixels outside of
* the cropped picture region, and the application does not need to fill them
* in.
* The decoder <em>will</em> allocate storage for a full frame, but the
* application <em>should not</em> rely on the padding containing sensible
* data.
*
* It is also generally recommended that the offsets and sizes should still be
* multiples of 2 to avoid chroma sampling shifts when chroma is sub-sampled.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 4.4, for more details.
*
* Frame rate, in frames per second, is stored as a rational fraction, as is
* the pixel aspect ratio.
* Note that this refers to the aspect ratio of the individual pixels, not of
* the overall frame itself.
* The frame aspect ratio can be computed from pixel aspect ratio using the
* image dimensions.*/
typedef struct{
/**\name Theora version
* Bitstream version information.*/
/*@{*/
unsigned char version_major;
unsigned char version_minor;
unsigned char version_subminor;
/*@}*/
/**The encoded frame width.
* This must be a multiple of 16, and less than 1048576.*/
ogg_uint32_t frame_width;
/**The encoded frame height.
* This must be a multiple of 16, and less than 1048576.*/
ogg_uint32_t frame_height;
/**The displayed picture width.
* This must be no larger than width.*/
ogg_uint32_t pic_width;
/**The displayed picture height.
* This must be no larger than height.*/
ogg_uint32_t pic_height;
/**The X offset of the displayed picture.
* This must be no larger than #frame_width-#pic_width or 255, whichever is
* smaller.*/
ogg_uint32_t pic_x;
/**The Y offset of the displayed picture.
* This must be no larger than #frame_height-#pic_height, and
* #frame_height-#pic_height-#pic_y must be no larger than 255.
* This slightly funny restriction is due to the fact that the offset is
* specified from the top of the image for consistency with the standard
* graphics left-handed coordinate system used throughout this API, while
* it is stored in the encoded stream as an offset from the bottom.*/
ogg_uint32_t pic_y;
/**\name Frame rate
* The frame rate, as a fraction.
* If either is 0, the frame rate is undefined.*/
/*@{*/
ogg_uint32_t fps_numerator;
ogg_uint32_t fps_denominator;
/*@}*/
/**\name Aspect ratio
* The aspect ratio of the pixels.
* If either value is zero, the aspect ratio is undefined.
* If not specified by any external means, 1:1 should be assumed.
* The aspect ratio of the full picture can be computed as
* \code
* aspect_numerator*pic_width/(aspect_denominator*pic_height).
* \endcode */
/*@{*/
ogg_uint32_t aspect_numerator;
ogg_uint32_t aspect_denominator;
/*@}*/
/**The color space.*/
th_colorspace colorspace;
/**The pixel format.*/
th_pixel_fmt pixel_fmt;
/**The target bit-rate in bits per second.
If initializing an encoder with this struct, set this field to a non-zero
value to activate CBR encoding by default.*/
int target_bitrate;
/**The target quality level.
Valid values range from 0 to 63, inclusive, with higher values giving
higher quality.
If initializing an encoder with this struct, and #target_bitrate is set
to zero, VBR encoding at this quality will be activated by default.*/
/*Currently this is set so that a qi of 0 corresponds to distortions of 24
times the JND, and each increase by 16 halves that value.
This gives us fine discrimination at low qualities, yet effective rate
control at high qualities.
The qi value 63 is special, however.
For this, the highest quality, we use one half of a JND for our threshold.
Due to the lower bounds placed on allowable quantizers in Theora, we will
not actually be able to achieve quality this good, but this should
provide as close to visually lossless quality as Theora is capable of.
We could lift the quantizer restrictions without breaking VP3.1
compatibility, but this would result in quantized coefficients that are
too large for the current bitstream to be able to store.
We'd have to redesign the token syntax to store these large coefficients,
which would make transcoding complex.*/
int quality;
/**The amount to shift to extract the last keyframe number from the granule
* position.
* This can be at most 31.
* th_info_init() will set this to a default value (currently <tt>6</tt>,
* which is good for streaming applications), but you can set it to 0 to
* make every frame a keyframe.
* The maximum distance between key frames is
* <tt>1<<#keyframe_granule_shift</tt>.
* The keyframe frequency can be more finely controlled with
* #TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE, which can also be adjusted
* during encoding (for example, to force the next frame to be a keyframe),
* but it cannot be set larger than the amount permitted by this field after
* the headers have been output.*/
int keyframe_granule_shift;
}th_info;
/**The comment information.
*
* This structure holds the in-stream metadata corresponding to
* the 'comment' header packet.
* The comment header is meant to be used much like someone jotting a quick
* note on the label of a video.
* It should be a short, to the point text note that can be more than a couple
* words, but not more than a short paragraph.
*
* The metadata is stored as a series of (tag, value) pairs, in
* length-encoded string vectors.
* The first occurrence of the '=' character delimits the tag and value.
* A particular tag may occur more than once, and order is significant.
* The character set encoding for the strings is always UTF-8, but the tag
* names are limited to ASCII, and treated as case-insensitive.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 6.3.3 for details.
*
* In filling in this structure, th_decode_headerin() will null-terminate
* the user_comment strings for safety.
* However, the bitstream format itself treats them as 8-bit clean vectors,
* possibly containing null characters, and so the length array should be
* treated as their authoritative length.
*/
typedef struct th_comment{
/**The array of comment string vectors.*/
char **user_comments;
/**An array of the corresponding length of each vector, in bytes.*/
int *comment_lengths;
/**The total number of comment strings.*/
int comments;
/**The null-terminated vendor string.
This identifies the software used to encode the stream.*/
char *vendor;
}th_comment;
/**A single base matrix.*/
typedef unsigned char th_quant_base[64];
/**A set of \a qi ranges.*/
typedef struct{
/**The number of ranges in the set.*/
int nranges;
/**The size of each of the #nranges ranges.
These must sum to 63.*/
const int *sizes;
/**#nranges <tt>+1</tt> base matrices.
Matrices \a i and <tt>i+1</tt> form the endpoints of range \a i.*/
const th_quant_base *base_matrices;
}th_quant_ranges;
/**A complete set of quantization parameters.
The quantizer for each coefficient is calculated as:
\code
Q=MAX(MIN(qmin[qti][ci!=0],scale[ci!=0][qi]*base[qti][pli][qi][ci]/100),
1024).
\endcode
\a qti is the quantization type index: 0 for intra, 1 for inter.
<tt>ci!=0</tt> is 0 for the DC coefficient and 1 for AC coefficients.
\a qi is the quality index, ranging between 0 (low quality) and 63 (high
quality).
\a pli is the color plane index: 0 for Y', 1 for Cb, 2 for Cr.
\a ci is the DCT coefficient index.
Coefficient indices correspond to the normal 2D DCT block
ordering--row-major with low frequencies first--\em not zig-zag order.
Minimum quantizers are constant, and are given by:
\code
qmin[2][2]={{4,2},{8,4}}.
\endcode
Parameters that can be stored in the bitstream are as follows:
- The two scale matrices ac_scale and dc_scale.
\code
scale[2][64]={dc_scale,ac_scale}.
\endcode
- The base matrices for each \a qi, \a qti and \a pli (up to 384 in all).
In order to avoid storing a full 384 base matrices, only a sparse set of
matrices are stored, and the rest are linearly interpolated.
This is done as follows.
For each \a qti and \a pli, a series of \a n \a qi ranges is defined.
The size of each \a qi range can vary arbitrarily, but they must sum to
63.
Then, <tt>n+1</tt> matrices are specified, one for each endpoint of the
ranges.
For interpolation purposes, each range's endpoints are the first \a qi
value it contains and one past the last \a qi value it contains.
Fractional values are rounded to the nearest integer, with ties rounded
away from zero.
Base matrices are stored by reference, so if the same matrices are used
multiple times, they will only appear once in the bitstream.
The bitstream is also capable of omitting an entire set of ranges and
its associated matrices if they are the same as either the previous
set (indexed in row-major order) or if the inter set is the same as the
intra set.
- Loop filter limit values.
The same limits are used for the loop filter in all color planes, despite
potentially differing levels of quantization in each.
For the current encoder, <tt>scale[ci!=0][qi]</tt> must be no greater
than <tt>scale[ci!=0][qi-1]</tt> and <tt>base[qti][pli][qi][ci]</tt> must
be no greater than <tt>base[qti][pli][qi-1][ci]</tt>.
These two conditions ensure that the actual quantizer for a given \a qti,
\a pli, and \a ci does not increase as \a qi increases.
This is not required by the decoder.*/
typedef struct{
/**The DC scaling factors.*/
ogg_uint16_t dc_scale[64];
/**The AC scaling factors.*/
ogg_uint16_t ac_scale[64];
/**The loop filter limit values.*/
unsigned char loop_filter_limits[64];
/**The \a qi ranges for each \a ci and \a pli.*/
th_quant_ranges qi_ranges[2][3];
}th_quant_info;
/**The number of Huffman tables used by Theora.*/
#define TH_NHUFFMAN_TABLES (80)
/**The number of DCT token values in each table.*/
#define TH_NDCT_TOKENS (32)
/**A Huffman code for a Theora DCT token.
* Each set of Huffman codes in a given table must form a complete, prefix-free
* code.
* There is no requirement that all the tokens in a table have a valid code,
* but the current encoder is not optimized to take advantage of this.
* If each of the five grouops of 16 tables does not contain at least one table
* with a code for every token, then the encoder may fail to encode certain
* frames.
* The complete table in the first group of 16 does not have to be in the same
* place as the complete table in the other groups, but the complete tables in
* the remaining four groups must all be in the same place.*/
typedef struct{
/**The bit pattern for the code, with the LSbit of the pattern aligned in
* the LSbit of the word.*/
ogg_uint32_t pattern;
/**The number of bits in the code.
* This must be between 0 and 32, inclusive.*/
int nbits;
}th_huff_code;
/**\defgroup basefuncs Functions Shared by Encode and Decode*/
/*@{*/
/**\name Basic shared functions*/
/*@{*/
/**Retrieves a human-readable string to identify the library vendor and
* version.
* \return the version string.*/
extern const char *th_version_string(void);
/**Retrieves the library version number.
* This is the highest bitstream version that the encoder library will produce,
* or that the decoder library can decode.
* This number is composed of a 16-bit major version, 8-bit minor version
* and 8 bit sub-version, composed as follows:
* \code
* (VERSION_MAJOR<<16)+(VERSION_MINOR<<8)+(VERSION_SUBMINOR)
* \endcode
* \return the version number.*/
extern ogg_uint32_t th_version_number(void);
/**Converts a granule position to an absolute frame index, starting at
* <tt>0</tt>.
* The granule position is interpreted in the context of a given
* #th_enc_ctx or #th_dec_ctx handle (either will suffice).
* \param _encdec A previously allocated #th_enc_ctx or #th_dec_ctx
* handle.
* \param _granpos The granule position to convert.
* \returns The absolute frame index corresponding to \a _granpos.
* \retval -1 The given granule position was invalid (i.e. negative).*/
extern ogg_int64_t th_granule_frame(void *_encdec,ogg_int64_t _granpos);
/**Converts a granule position to an absolute time in seconds.
* The granule position is interpreted in the context of a given
* #th_enc_ctx or #th_dec_ctx handle (either will suffice).
* \param _encdec A previously allocated #th_enc_ctx or #th_dec_ctx
* handle.
* \param _granpos The granule position to convert.
* \return The absolute time in seconds corresponding to \a _granpos.
* This is the "end time" for the frame, or the latest time it should
* be displayed.
* It is not the presentation time.
* \retval -1 The given granule position was invalid (i.e. negative).*/
extern double th_granule_time(void *_encdec,ogg_int64_t _granpos);
/**Determines whether a Theora packet is a header or not.
* This function does no verification beyond checking the packet type bit, so
* it should not be used for bitstream identification; use
* th_decode_headerin() for that.
* As per the Theora specification, an empty (0-byte) packet is treated as a
* data packet (a delta frame with no coded blocks).
* \param _op An <tt>ogg_packet</tt> containing encoded Theora data.
* \retval 1 The packet is a header packet
* \retval 0 The packet is a video data packet.*/
extern int th_packet_isheader(ogg_packet *_op);
/**Determines whether a theora packet is a key frame or not.
* This function does no verification beyond checking the packet type and
* key frame bits, so it should not be used for bitstream identification; use
* th_decode_headerin() for that.
* As per the Theora specification, an empty (0-byte) packet is treated as a
* delta frame (with no coded blocks).
* \param _op An <tt>ogg_packet</tt> containing encoded Theora data.
* \retval 1 The packet contains a key frame.
* \retval 0 The packet contains a delta frame.
* \retval -1 The packet is not a video data packet.*/
extern int th_packet_iskeyframe(ogg_packet *_op);
/*@}*/
/**\name Functions for manipulating header data*/
/*@{*/
/**Initializes a th_info structure.
* This should be called on a freshly allocated #th_info structure before
* attempting to use it.
* \param _info The #th_info struct to initialize.*/
extern void th_info_init(th_info *_info);
/**Clears a #th_info structure.
* This should be called on a #th_info structure after it is no longer
* needed.
* \param _info The #th_info struct to clear.*/
extern void th_info_clear(th_info *_info);
/**Initialize a #th_comment structure.
* This should be called on a freshly allocated #th_comment structure
* before attempting to use it.
* \param _tc The #th_comment struct to initialize.*/
extern void th_comment_init(th_comment *_tc);
/**Add a comment to an initialized #th_comment structure.
* \note Neither th_comment_add() nor th_comment_add_tag() support
* comments containing null values, although the bitstream format does
* support them.
* To add such comments you will need to manipulate the #th_comment
* structure directly.
* \param _tc The #th_comment struct to add the comment to.
* \param _comment Must be a null-terminated UTF-8 string containing the
* comment in "TAG=the value" form.*/
extern void th_comment_add(th_comment *_tc, char *_comment);
/**Add a comment to an initialized #th_comment structure.
* \note Neither th_comment_add() nor th_comment_add_tag() support
* comments containing null values, although the bitstream format does
* support them.
* To add such comments you will need to manipulate the #th_comment
* structure directly.
* \param _tc The #th_comment struct to add the comment to.
* \param _tag A null-terminated string containing the tag associated with
* the comment.
* \param _val The corresponding value as a null-terminated string.*/
extern void th_comment_add_tag(th_comment *_tc,char *_tag,char *_val);
/**Look up a comment value by its tag.
* \param _tc An initialized #th_comment structure.
* \param _tag The tag to look up.
* \param _count The instance of the tag.
* The same tag can appear multiple times, each with a distinct
* value, so an index is required to retrieve them all.
* The order in which these values appear is significant and
* should be preserved.
* Use th_comment_query_count() to get the legal range for
* the \a _count parameter.
* \return A pointer to the queried tag's value.
* This points directly to data in the #th_comment structure.
* It should not be modified or freed by the application, and
* modifications to the structure may invalidate the pointer.
* \retval NULL If no matching tag is found.*/
extern char *th_comment_query(th_comment *_tc,char *_tag,int _count);
/**Look up the number of instances of a tag.
* Call this first when querying for a specific tag and then iterate over the
* number of instances with separate calls to th_comment_query() to
* retrieve all the values for that tag in order.
* \param _tc An initialized #th_comment structure.
* \param _tag The tag to look up.
* \return The number on instances of this particular tag.*/
extern int th_comment_query_count(th_comment *_tc,char *_tag);
/**Clears a #th_comment structure.
* This should be called on a #th_comment structure after it is no longer
* needed.
* It will free all memory used by the structure members.
* \param _tc The #th_comment struct to clear.*/
extern void th_comment_clear(th_comment *_tc);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.17 2003/12/06 18:06:19 arc Exp $
********************************************************************/
#ifndef _O_THEORA_H_
#define _O_THEORA_H_
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
#include <stddef.h> /* for size_t */
#include <ogg/ogg.h>
/** \file
* The libtheora pre-1.0 legacy C API.
*
* \ingroup oldfuncs
*
* \section intro Introduction
*
* This is the documentation for the libtheora legacy C API, declared in
* the theora.h header, which describes the old interface used before
* the 1.0 release. This API was widely deployed for several years and
* remains supported, but for new code we recommend the cleaner API
* declared in theoradec.h and theoraenc.h.
*
* libtheora is the reference implementation for
* <a href="http://www.theora.org/">Theora</a>, a free video codec.
* Theora is derived from On2's VP3 codec with improved integration with
* Ogg multimedia formats by <a href="http://www.xiph.org/">Xiph.Org</a>.
*
* \section overview Overview
*
* This library will both decode and encode theora packets to/from raw YUV
* frames. In either case, the packets will most likely either come from or
* need to be embedded in an Ogg stream. Use
* <a href="http://xiph.org/ogg/">libogg</a> or
* <a href="http://www.annodex.net/software/liboggz/index.html">liboggz</a>
* to extract/package these packets.
*
* \section decoding Decoding Process
*
* Decoding can be separated into the following steps:
* -# initialise theora_info and theora_comment structures using
* theora_info_init() and theora_comment_init():
\verbatim
theora_info info;
theora_comment comment;
theora_info_init(&info);
theora_comment_init(&comment);
\endverbatim
* -# retrieve header packets from Ogg stream (there should be 3) and decode
* into theora_info and theora_comment structures using
* theora_decode_header(). See \ref identification for more information on
* identifying which packets are theora packets.
\verbatim
int i;
for (i = 0; i < 3; i++)
{
(get a theora packet "op" from the Ogg stream)
theora_decode_header(&info, &comment, op);
}
\endverbatim
* -# initialise the decoder based on the information retrieved into the
* theora_info struct by theora_decode_header(). You will need a
* theora_state struct.
\verbatim
theora_state state;
theora_decode_init(&state, &info);
\endverbatim
* -# pass in packets and retrieve decoded frames! See the yuv_buffer
* documentation for information on how to retrieve raw YUV data.
\verbatim
yuf_buffer buffer;
while (last packet was not e_o_s) {
(get a theora packet "op" from the Ogg stream)
theora_decode_packetin(&state, op);
theora_decode_YUVout(&state, &buffer);
}
\endverbatim
*
*
* \subsection identification Identifying Theora Packets
*
* All streams inside an Ogg file have a unique serial_no attached to the
* stream. Typically, you will want to
* - retrieve the serial_no for each b_o_s (beginning of stream) page
* encountered within the Ogg file;
* - test the first (only) packet on that page to determine if it is a theora
* packet;
* - once you have found a theora b_o_s page then use the retrieved serial_no
* to identify future packets belonging to the same theora stream.
*
* Note that you \e cannot use theora_packet_isheader() to determine if a
* packet is a theora packet or not, as this function does not perform any
* checking beyond whether a header bit is present. Instead, use the
* theora_decode_header() function and check the return value; or examine the
* header bytes at the beginning of the Ogg page.
*/
/** \defgroup oldfuncs Legacy pre-1.0 C API */
/* @{ */
/**
* A YUV buffer for passing uncompressed frames to and from the codec.
* This holds a Y'CbCr frame in planar format. The CbCr planes can be
* subsampled and have their own separate dimensions and row stride
* offsets. Note that the strides may be negative in some
* configurations. For theora the width and height of the largest plane
* must be a multiple of 16. The actual meaningful picture size and
* offset are stored in the theora_info structure; frames returned by
* the decoder may need to be cropped for display.
*
* All samples are 8 bits. Within each plane samples are ordered by
* row from the top of the frame to the bottom. Within each row samples
* are ordered from left to right.
*
* During decode, the yuv_buffer struct is allocated by the user, but all
* fields (including luma and chroma pointers) are filled by the library.
* These pointers address library-internal memory and their contents should
* not be modified.
*
* Conversely, during encode the user allocates the struct and fills out all
* fields. The user also manages the data addressed by the luma and chroma
* pointers. See the encoder_example.c and dump_video.c example files in
* theora/examples/ for more information.
*/
typedef struct {
int y_width; /**< Width of the Y' luminance plane */
int y_height; /**< Height of the luminance plane */
int y_stride; /**< Offset in bytes between successive rows */
int uv_width; /**< Width of the Cb and Cr chroma planes */
int uv_height; /**< Height of the chroma planes */
int uv_stride; /**< Offset between successive chroma rows */
unsigned char *y; /**< Pointer to start of luminance data */
unsigned char *u; /**< Pointer to start of Cb data */
unsigned char *v; /**< Pointer to start of Cr data */
} yuv_buffer;
/**
* A Colorspace.
*/
typedef enum {
OC_CS_UNSPECIFIED, /**< The colorspace is unknown or unspecified */
OC_CS_ITU_REC_470M, /**< This is the best option for 'NTSC' content */
OC_CS_ITU_REC_470BG, /**< This is the best option for 'PAL' content */
OC_CS_NSPACES /**< This marks the end of the defined colorspaces */
} theora_colorspace;
/**
* A Chroma subsampling
*
* These enumerate the available chroma subsampling options supported
* by the theora format. See Section 4.4 of the specification for
* exact definitions.
*/
typedef enum {
OC_PF_420, /**< Chroma subsampling by 2 in each direction (4:2:0) */
OC_PF_RSVD, /**< Reserved value */
OC_PF_422, /**< Horizonatal chroma subsampling by 2 (4:2:2) */
OC_PF_444, /**< No chroma subsampling at all (4:4:4) */
} theora_pixelformat;
/**
* Theora bitstream info.
* Contains the basic playback parameters for a stream,
* corresponding to the initial 'info' header packet.
*
* Encoded theora frames must be a multiple of 16 in width and height.
* To handle other frame sizes, a crop rectangle is specified in
* frame_height and frame_width, offset_x and * offset_y. The offset
* and size should still be a multiple of 2 to avoid chroma sampling
* shifts. Offset values in this structure are measured from the
* upper left of the image.
*
* Frame rate, in frames per second, is stored as a rational
* fraction. Aspect ratio is also stored as a rational fraction, and
* refers to the aspect ratio of the frame pixels, not of the
* overall frame itself.
*
* See <a href="http://svn.xiph.org/trunk/theora/examples/encoder_example.c">
* examples/encoder_example.c</a> for usage examples of the
* other paramters and good default settings for the encoder parameters.
*/
typedef struct {
ogg_uint32_t width; /**< encoded frame width */
ogg_uint32_t height; /**< encoded frame height */
ogg_uint32_t frame_width; /**< display frame width */
ogg_uint32_t frame_height; /**< display frame height */
ogg_uint32_t offset_x; /**< horizontal offset of the displayed frame */
ogg_uint32_t offset_y; /**< vertical offset of the displayed frame */
ogg_uint32_t fps_numerator; /**< frame rate numerator **/
ogg_uint32_t fps_denominator; /**< frame rate denominator **/
ogg_uint32_t aspect_numerator; /**< pixel aspect ratio numerator */
ogg_uint32_t aspect_denominator; /**< pixel aspect ratio denominator */
theora_colorspace colorspace; /**< colorspace */
int target_bitrate; /**< nominal bitrate in bits per second */
int quality; /**< Nominal quality setting, 0-63 */
int quick_p; /**< Quick encode/decode */
/* decode only */
unsigned char version_major;
unsigned char version_minor;
unsigned char version_subminor;
void *codec_setup;
/* encode only */
int dropframes_p;
int keyframe_auto_p;
ogg_uint32_t keyframe_frequency;
ogg_uint32_t keyframe_frequency_force; /* also used for decode init to
get granpos shift correct */
ogg_uint32_t keyframe_data_target_bitrate;
ogg_int32_t keyframe_auto_threshold;
ogg_uint32_t keyframe_mindistance;
ogg_int32_t noise_sensitivity;
ogg_int32_t sharpness;
theora_pixelformat pixelformat; /**< chroma subsampling mode to expect */
} theora_info;
/** Codec internal state and context.
*/
typedef struct{
theora_info *i;
ogg_int64_t granulepos;
void *internal_encode;
void *internal_decode;
} theora_state;
/**
* Comment header metadata.
*
* This structure holds the in-stream metadata corresponding to
* the 'comment' header packet.
*
* Meta data is stored as a series of (tag, value) pairs, in
* length-encoded string vectors. The first occurence of the
* '=' character delimits the tag and value. A particular tag
* may occur more than once. The character set encoding for
* the strings is always UTF-8, but the tag names are limited
* to case-insensitive ASCII. See the spec for details.
*
* In filling in this structure, theora_decode_header() will
* null-terminate the user_comment strings for safety. However,
* the bitstream format itself treats them as 8-bit clean,
* and so the length array should be treated as authoritative
* for their length.
*/
typedef struct theora_comment{
char **user_comments; /**< An array of comment string vectors */
int *comment_lengths; /**< An array of corresponding string vector lengths in bytes */
int comments; /**< The total number of comment string vectors */
char *vendor; /**< The vendor string identifying the encoder, null terminated */
} theora_comment;
/**\name theora_control() codes */
/* \anchor decctlcodes_old
* These are the available request codes for theora_control()
* when called with a decoder instance.
* By convention decoder control codes are odd, to distinguish
* them from \ref encctlcodes_old "encoder control codes" which
* are even.
*
* Note that since the 1.0 release, both the legacy and the final
* implementation accept all the same control codes, but only the
* final API declares the newer codes.
*
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Get the maximum post-processing level.
* The decoder supports a post-processing filter that can improve
* the appearance of the decoded images. This returns the highest
* level setting for this post-processor, corresponding to maximum
* improvement and computational expense.
*/
#define TH_DECCTL_GET_PPLEVEL_MAX (1)
/**Set the post-processing level.
* Sets the level of post-processing to use when decoding the
* compressed stream. This must be a value between zero (off)
* and the maximum returned by TH_DECCTL_GET_PPLEVEL_MAX.
*/
#define TH_DECCTL_SET_PPLEVEL (3)
/**Sets the maximum distance between key frames.
* This can be changed during an encode, but will be bounded by
* <tt>1<<th_info#keyframe_granule_shift</tt>.
* If it is set before encoding begins, th_info#keyframe_granule_shift will
* be enlarged appropriately.
*
* \param[in] buf <tt>ogg_uint32_t</tt>: The maximum distance between key
* frames.
* \param[out] buf <tt>ogg_uint32_t</tt>: The actual maximum distance set.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(ogg_uint32_t)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE (4)
/**Set the granule position.
* Call this after a seek, to update the internal granulepos
* in the decoder, to insure that subsequent frames are marked
* properly. If you track timestamps yourself and do not use
* the granule postion returned by the decoder, then you do
* not need to use this control.
*/
#define TH_DECCTL_SET_GRANPOS (5)
/**\anchor encctlcodes_old */
/**Sets the quantization parameters to use.
* The parameters are copied, not stored by reference, so they can be freed
* after this call.
* <tt>NULL</tt> may be specified to revert to the default parameters.
*
* \param[in] buf #th_quant_info
* \retval OC_FAULT \a theora_state is <tt>NULL</tt>.
* \retval OC_EINVAL Encoding has already begun, the quantization parameters
* are not acceptable to this version of the encoder,
* \a buf is <tt>NULL</tt> and \a buf_sz is not zero,
* or \a buf is non-<tt>NULL</tt> and \a buf_sz is
* not <tt>sizeof(#th_quant_info)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUANT_PARAMS (2)
/**Disables any encoder features that would prevent lossless transcoding back
* to VP3.
* This primarily means disabling block-level QI values and not using 4MV mode
* when any of the luma blocks in a macro block are not coded.
* It also includes using the VP3 quantization tables and Huffman codes; if you
* set them explicitly after calling this function, the resulting stream will
* not be VP3-compatible.
* If you enable VP3-compatibility when encoding 4:2:2 or 4:4:4 source
* material, or when using a picture region smaller than the full frame (e.g.
* a non-multiple-of-16 width or height), then non-VP3 bitstream features will
* still be disabled, but the stream will still not be VP3-compatible, as VP3
* was not capable of encoding such formats.
* If you call this after encoding has already begun, then the quantization
* tables and codebooks cannot be changed, but the frame-level features will
* be enabled or disabled as requested.
*
* \param[in] buf <tt>int</tt>: a non-zero value to enable VP3 compatibility,
* or 0 to disable it (the default).
* \param[out] buf <tt>int</tt>: 1 if all bitstream features required for
* VP3-compatibility could be set, and 0 otherwise.
* The latter will be returned if the pixel format is not
* 4:2:0, the picture region is smaller than the full frame,
* or if encoding has begun, preventing the quantization
* tables and codebooks from being set.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_VP3_COMPATIBLE (10)
/**Gets the maximum speed level.
* Higher speed levels favor quicker encoding over better quality per bit.
* Depending on the encoding mode, and the internal algorithms used, quality
* may actually improve, but in this case bitrate will also likely increase.
* In any case, overall rate/distortion performance will probably decrease.
* The maximum value, and the meaning of each value, may change depending on
* the current encoding mode (VBR vs. CQI, etc.).
*
* \param[out] buf int: The maximum encoding speed level.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>.
* \retval OC_IMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL_MAX (12)
/**Sets the speed level.
* By default a speed value of 1 is used.
*
* \param[in] buf int: The new encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>, or the
* encoding speed level is out of bounds.
* The maximum encoding speed level may be
* implementation- and encoding mode-specific, and can be
* obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
* \retval OC_IMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_SPLEVEL (14)
/*@}*/
#define OC_FAULT -1 /**< General failure */
#define OC_EINVAL -10 /**< Library encountered invalid internal data */
#define OC_DISABLED -11 /**< Requested action is disabled */
#define OC_BADHEADER -20 /**< Header packet was corrupt/invalid */
#define OC_NOTFORMAT -21 /**< Packet is not a theora packet */
#define OC_VERSION -22 /**< Bitstream version is not handled */
#define OC_IMPL -23 /**< Feature or action not implemented */
#define OC_BADPACKET -24 /**< Packet is corrupt */
#define OC_NEWPACKET -25 /**< Packet is an (ignorable) unhandled extension */
#define OC_DUPFRAME 1 /**< Packet is a dropped frame */
/**
* Retrieve a human-readable string to identify the encoder vendor and version.
* \returns A version string.
*/
extern const char *theora_version_string(void);
/**
* Retrieve a 32-bit version number.
* This number is composed of a 16-bit major version, 8-bit minor version
* and 8 bit sub-version, composed as follows:
<pre>
(VERSION_MAJOR<<16) + (VERSION_MINOR<<8) + (VERSION_SUB)
</pre>
* \returns The version number.
*/
extern ogg_uint32_t theora_version_number(void);
/**
* Initialize the theora encoder.
* \param th The theora_state handle to initialize for encoding.
* \param ti A theora_info struct filled with the desired encoding parameters.
* \retval 0 Success
*/
extern int theora_encode_init(theora_state *th, theora_info *ti);
/**
* Submit a YUV buffer to the theora encoder.
* \param t A theora_state handle previously initialized for encoding.
* \param yuv A buffer of YUV data to encode. Note that both the yuv_buffer
* struct and the luma/chroma buffers within should be allocated by
* the user.
* \retval OC_EINVAL Encoder is not ready, or is finished.
* \retval -1 The size of the given frame differs from those previously input
* \retval 0 Success
*/
extern int theora_encode_YUVin(theora_state *t, yuv_buffer *yuv);
/**
* Request the next packet of encoded video.
* The encoded data is placed in a user-provided ogg_packet structure.
* \param t A theora_state handle previously initialized for encoding.
* \param last_p whether this is the last packet the encoder should produce.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to encoded
* data. The memory for the encoded data is owned by libtheora.
* \retval 0 No internal storage exists OR no packet is ready
* \retval -1 The encoding process has completed
* \retval 1 Success
*/
extern int theora_encode_packetout( theora_state *t, int last_p,
ogg_packet *op);
/**
* Request a packet containing the initial header.
* A pointer to the header data is placed in a user-provided ogg_packet
* structure.
* \param t A theora_state handle previously initialized for encoding.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the header
* data. The memory for the header data is owned by libtheora.
* \retval 0 Success
*/
extern int theora_encode_header(theora_state *t, ogg_packet *op);
/**
* Request a comment header packet from provided metadata.
* A pointer to the comment data is placed in a user-provided ogg_packet
* structure.
* \param tc A theora_comment structure filled with the desired metadata
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the encoded
* comment data. The memory for the comment data is owned by
* libtheora.
* \retval 0 Success
*/
extern int theora_encode_comment(theora_comment *tc, ogg_packet *op);
/**
* Request a packet containing the codebook tables for the stream.
* A pointer to the codebook data is placed in a user-provided ogg_packet
* structure.
* \param t A theora_state handle previously initialized for encoding.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the codebook
* data. The memory for the header data is owned by libtheora.
* \retval 0 Success
*/
extern int theora_encode_tables(theora_state *t, ogg_packet *op);
/**
* Decode an Ogg packet, with the expectation that the packet contains
* an initial header, comment data or codebook tables.
*
* \param ci A theora_info structure to fill. This must have been previously
* initialized with theora_info_init(). If \a op contains an initial
* header, theora_decode_header() will fill \a ci with the
* parsed header values. If \a op contains codebook tables,
* theora_decode_header() will parse these and attach an internal
* representation to \a ci->codec_setup.
* \param cc A theora_comment structure to fill. If \a op contains comment
* data, theora_decode_header() will fill \a cc with the parsed
* comments.
* \param op An ogg_packet structure which you expect contains an initial
* header, comment data or codebook tables.
*
* \retval OC_BADHEADER \a op is NULL; OR the first byte of \a op->packet
* has the signature of an initial packet, but op is
* not a b_o_s packet; OR this packet has the signature
* of an initial header packet, but an initial header
* packet has already been seen; OR this packet has the
* signature of a comment packet, but the initial header
* has not yet been seen; OR this packet has the signature
* of a comment packet, but contains invalid data; OR
* this packet has the signature of codebook tables,
* but the initial header or comments have not yet
* been seen; OR this packet has the signature of codebook
* tables, but contains invalid data;
* OR the stream being decoded has a compatible version
* but this packet does not have the signature of a
* theora initial header, comments, or codebook packet
* \retval OC_VERSION The packet data of \a op is an initial header with
* a version which is incompatible with this version of
* libtheora.
* \retval OC_NEWPACKET the stream being decoded has an incompatible (future)
* version and contains an unknown signature.
* \retval 0 Success
*
* \note The normal usage is that theora_decode_header() be called on the
* first three packets of a theora logical bitstream in succession.
*/
extern int theora_decode_header(theora_info *ci, theora_comment *cc,
ogg_packet *op);
/**
* Initialize a theora_state handle for decoding.
* \param th The theora_state handle to initialize.
* \param c A theora_info struct filled with the desired decoding parameters.
* This is of course usually obtained from a previous call to
* theora_decode_header().
* \retval 0 Success
*/
extern int theora_decode_init(theora_state *th, theora_info *c);
/**
* Input a packet containing encoded data into the theora decoder.
* \param th A theora_state handle previously initialized for decoding.
* \param op An ogg_packet containing encoded theora data.
* \retval 0 Success
* \retval OC_BADPACKET \a op does not contain encoded video data
*/
extern int theora_decode_packetin(theora_state *th,ogg_packet *op);
/**
* Output the next available frame of decoded YUV data.
* \param th A theora_state handle previously initialized for decoding.
* \param yuv A yuv_buffer in which libtheora should place the decoded data.
* Note that the buffer struct itself is allocated by the user, but
* that the luma and chroma pointers will be filled in by the
* library. Also note that these luma and chroma regions should be
* considered read-only by the user.
* \retval 0 Success
*/
extern int theora_decode_YUVout(theora_state *th,yuv_buffer *yuv);
/**
* Report whether a theora packet is a header or not
* This function does no verification beyond checking the header
* flag bit so it should not be used for bitstream identification;
* use theora_decode_header() for that.
*
* \param op An ogg_packet containing encoded theora data.
* \retval 1 The packet is a header packet
* \retval 0 The packet is not a header packet (and so contains frame data)
*
* Thus function was added in the 1.0alpha4 release.
*/
extern int theora_packet_isheader(ogg_packet *op);
/**
* Report whether a theora packet is a keyframe or not
*
* \param op An ogg_packet containing encoded theora data.
* \retval 1 The packet contains a keyframe image
* \retval 0 The packet is contains an interframe delta
* \retval -1 The packet is not an image data packet at all
*
* Thus function was added in the 1.0alpha4 release.
*/
extern int theora_packet_iskeyframe(ogg_packet *op);
/**
* Report the granulepos shift radix
*
* When embedded in Ogg, Theora uses a two-part granulepos,
* splitting the 64-bit field into two pieces. The more-significant
* section represents the frame count at the last keyframe,
* and the less-significant section represents the count of
* frames since the last keyframe. In this way the overall
* field is still non-decreasing with time, but usefully encodes
* a pointer to the last keyframe, which is necessary for
* correctly restarting decode after a seek.
*
* This function reports the number of bits used to represent
* the distance to the last keyframe, and thus how the granulepos
* field must be shifted or masked to obtain the two parts.
*
* Since libtheora returns compressed data in an ogg_packet
* structure, this may be generally useful even if the Theora
* packets are not being used in an Ogg container.
*
* \param ti A previously initialized theora_info struct
* \returns The bit shift dividing the two granulepos fields
*
* This function was added in the 1.0alpha5 release.
*/
int theora_granule_shift(theora_info *ti);
/**
* Convert a granulepos to an absolute frame index, starting at 0.
* The granulepos is interpreted in the context of a given theora_state handle.
*
* Note that while the granulepos encodes the frame count (i.e. starting
* from 1) this call returns the frame index, starting from zero. Thus
* One can calculate the presentation time by multiplying the index by
* the rate.
*
* \param th A previously initialized theora_state handle (encode or decode)
* \param granulepos The granulepos to convert.
* \returns The frame index corresponding to \a granulepos.
* \retval -1 The given granulepos is undefined (i.e. negative)
*
* Thus function was added in the 1.0alpha4 release.
*/
extern ogg_int64_t theora_granule_frame(theora_state *th,ogg_int64_t granulepos);
/**
* Convert a granulepos to absolute time in seconds. The granulepos is
* interpreted in the context of a given theora_state handle, and gives
* the end time of a frame's presentation as used in Ogg mux ordering.
*
* \param th A previously initialized theora_state handle (encode or decode)
* \param granulepos The granulepos to convert.
* \returns The absolute time in seconds corresponding to \a granulepos.
* This is the "end time" for the frame, or the latest time it should
* be displayed.
* It is not the presentation time.
* \retval -1. The given granulepos is undefined (i.e. negative), or
* \retval -1. The function has been disabled because floating
* point support is not available.
*/
extern double theora_granule_time(theora_state *th,ogg_int64_t granulepos);
/**
* Initialize a theora_info structure. All values within the given theora_info
* structure are initialized, and space is allocated within libtheora for
* internal codec setup data.
* \param c A theora_info struct to initialize.
*/
extern void theora_info_init(theora_info *c);
/**
* Clear a theora_info structure. All values within the given theora_info
* structure are cleared, and associated internal codec setup data is freed.
* \param c A theora_info struct to initialize.
*/
extern void theora_info_clear(theora_info *c);
/**
* Free all internal data associated with a theora_state handle.
* \param t A theora_state handle.
*/
extern void theora_clear(theora_state *t);
/**
* Initialize an allocated theora_comment structure
* \param tc An allocated theora_comment structure
**/
extern void theora_comment_init(theora_comment *tc);
/**
* Add a comment to an initialized theora_comment structure
* \param tc A previously initialized theora comment structure
* \param comment A null-terminated string encoding the comment in the form
* "TAG=the value"
*
* Neither theora_comment_add() nor theora_comment_add_tag() support
* comments containing null values, although the bitstream format
* supports this. To add such comments you will need to manipulate
* the theora_comment structure directly.
**/
extern void theora_comment_add(theora_comment *tc, char *comment);
/**
* Add a comment to an initialized theora_comment structure.
* \param tc A previously initialized theora comment structure
* \param tag A null-terminated string containing the tag
* associated with the comment.
* \param value The corresponding value as a null-terminated string
*
* Neither theora_comment_add() nor theora_comment_add_tag() support
* comments containing null values, although the bitstream format
* supports this. To add such comments you will need to manipulate
* the theora_comment structure directly.
**/
extern void theora_comment_add_tag(theora_comment *tc,
char *tag, char *value);
/**
* Look up a comment value by tag.
* \param tc Tn initialized theora_comment structure
* \param tag The tag to look up
* \param count The instance of the tag. The same tag can appear multiple
* times, each with a distinct and ordered value, so an index
* is required to retrieve them all.
* \returns A pointer to the queried tag's value
* \retval NULL No matching tag is found
*
* \note Use theora_comment_query_count() to get the legal range for the
* count parameter.
**/
extern char *theora_comment_query(theora_comment *tc, char *tag, int count);
/** Look up the number of instances of a tag.
* \param tc An initialized theora_comment structure
* \param tag The tag to look up
* \returns The number on instances of a particular tag.
*
* Call this first when querying for a specific tag and then interate
* over the number of instances with separate calls to
* theora_comment_query() to retrieve all instances in order.
**/
extern int theora_comment_query_count(theora_comment *tc, char *tag);
/**
* Clear an allocated theora_comment struct so that it can be freed.
* \param tc An allocated theora_comment structure.
**/
extern void theora_comment_clear(theora_comment *tc);
/**Encoder control function.
* This is used to provide advanced control the encoding process.
* \param th A #theora_state handle.
* \param req The control code to process.
* See \ref encctlcodes_old "the list of available
* control codes" for details.
* \param buf The parameters for this control code.
* \param buf_sz The size of the parameter buffer.*/
extern int theora_control(theora_state *th,int req,void *buf,size_t buf_sz);
/* @} */ /* end oldfuncs doxygen group */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _O_THEORA_H_ */

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\file
* The <tt>libtheoradec</tt> C decoding API.*/
#if !defined(_O_THEORA_THEORADEC_H_)
# define _O_THEORA_THEORADEC_H_ (1)
# include <stddef.h>
# include <ogg/ogg.h>
# include "codec.h"
#if defined(__cplusplus)
extern "C" {
#endif
/**\name th_decode_ctl() codes
* \anchor decctlcodes
* These are the available request codes for th_decode_ctl().
* By convention, these are odd, to distinguish them from the
* \ref encctlcodes "encoder control codes".
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Gets the maximum post-processing level.
* The decoder supports a post-processing filter that can improve
* the appearance of the decoded images. This returns the highest
* level setting for this post-processor, corresponding to maximum
* improvement and computational expense.
*
* \param[out] _buf int: The maximum post-processing level.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_DECCTL_GET_PPLEVEL_MAX (1)
/**Sets the post-processing level.
* By default, post-processing is disabled.
*
* Sets the level of post-processing to use when decoding the
* compressed stream. This must be a value between zero (off)
* and the maximum returned by TH_DECCTL_GET_PPLEVEL_MAX.
*
* \param[in] _buf int: The new post-processing level.
* 0 to disable; larger values use more CPU.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* post-processing level is out of bounds.
* The maximum post-processing level may be
* implementation-specific, and can be obtained via
* #TH_DECCTL_GET_PPLEVEL_MAX.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_DECCTL_SET_PPLEVEL (3)
/**Sets the granule position.
* Call this after a seek, before decoding the first frame, to ensure that the
* proper granule position is returned for all subsequent frames.
* If you track timestamps yourself and do not use the granule position
* returned by the decoder, then you need not call this function.
*
* \param[in] _buf <tt>ogg_int64_t</tt>: The granule position of the next
* frame.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(ogg_int64_t)</tt>, or the
* granule position is negative.*/
#define TH_DECCTL_SET_GRANPOS (5)
/**Sets the striped decode callback function.
* If set, this function will be called as each piece of a frame is fully
* decoded in th_decode_packetin().
* You can pass in a #th_stripe_callback with
* th_stripe_callback#stripe_decoded set to <tt>NULL</tt> to disable the
* callbacks at any point.
* Enabling striped decode does not prevent you from calling
* th_decode_ycbcr_out() after the frame is fully decoded.
*
* \param[in] _buf #th_stripe_callback: The callback parameters.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not
* <tt>sizeof(th_stripe_callback)</tt>.*/
#define TH_DECCTL_SET_STRIPE_CB (7)
/**Enables telemetry and sets the macroblock display mode */
#define TH_DECCTL_SET_TELEMETRY_MBMODE (9)
/**Enables telemetry and sets the motion vector display mode */
#define TH_DECCTL_SET_TELEMETRY_MV (11)
/**Enables telemetry and sets the adaptive quantization display mode */
#define TH_DECCTL_SET_TELEMETRY_QI (13)
/**Enables telemetry and sets the bitstream breakdown visualization mode */
#define TH_DECCTL_SET_TELEMETRY_BITS (15)
/*@}*/
/**A callback function for striped decode.
* This is a function pointer to an application-provided function that will be
* called each time a section of the image is fully decoded in
* th_decode_packetin().
* This allows the application to process the section immediately, while it is
* still in cache.
* Note that the frame is decoded bottom to top, so \a _yfrag0 will steadily
* decrease with each call until it reaches 0, at which point the full frame
* is decoded.
* The number of fragment rows made available in each call depends on the pixel
* format and the number of post-processing filters enabled, and may not even
* be constant for the entire frame.
* If a non-<tt>NULL</tt> \a _granpos pointer is passed to
* th_decode_packetin(), the granule position for the frame will be stored
* in it before the first callback is made.
* If an entire frame is dropped (a 0-byte packet), then no callbacks will be
* made at all for that frame.
* \param _ctx An application-provided context pointer.
* \param _buf The image buffer for the decoded frame.
* \param _yfrag0 The Y coordinate of the first row of 8x8 fragments
* decoded.
* Multiply this by 8 to obtain the pixel row number in the
* luma plane.
* If the chroma planes are subsampled in the Y direction,
* this will always be divisible by two.
* \param _yfrag_end The Y coordinate of the first row of 8x8 fragments past
* the newly decoded section.
* If the chroma planes are subsampled in the Y direction,
* this will always be divisible by two.
* I.e., this section contains fragment rows
* <tt>\a _yfrag0 ...\a _yfrag_end -1</tt>.*/
typedef void (*th_stripe_decoded_func)(void *_ctx,th_ycbcr_buffer _buf,
int _yfrag0,int _yfrag_end);
/**The striped decode callback data to pass to #TH_DECCTL_SET_STRIPE_CB.*/
typedef struct{
/**An application-provided context pointer.
* This will be passed back verbatim to the application.*/
void *ctx;
/**The callback function pointer.*/
th_stripe_decoded_func stripe_decoded;
}th_stripe_callback;
/**\name Decoder state
The following data structures are opaque, and their contents are not
publicly defined by this API.
Referring to their internals directly is unsupported, and may break without
warning.*/
/*@{*/
/**The decoder context.*/
typedef struct th_dec_ctx th_dec_ctx;
/**Setup information.
This contains auxiliary information (Huffman tables and quantization
parameters) decoded from the setup header by th_decode_headerin() to be
passed to th_decode_alloc().
It can be re-used to initialize any number of decoders, and can be freed
via th_setup_free() at any time.*/
typedef struct th_setup_info th_setup_info;
/*@}*/
/**\defgroup decfuncs Functions for Decoding*/
/*@{*/
/**\name Functions for decoding
* You must link to <tt>libtheoradec</tt> if you use any of the
* functions in this section.
*
* The functions are listed in the order they are used in a typical decode.
* The basic steps are:
* - Parse the header packets by repeatedly calling th_decode_headerin().
* - Allocate a #th_dec_ctx handle with th_decode_alloc().
* - Call th_setup_free() to free any memory used for codec setup
* information.
* - Perform any additional decoder configuration with th_decode_ctl().
* - For each video data packet:
* - Submit the packet to the decoder via th_decode_packetin().
* - Retrieve the uncompressed video data via th_decode_ycbcr_out().
* - Call th_decode_free() to release all decoder memory.*/
/*@{*/
/**Decodes the header packets of a Theora stream.
* This should be called on the initial packets of the stream, in succession,
* until it returns <tt>0</tt>, indicating that all headers have been
* processed, or an error is encountered.
* At least three header packets are required, and additional optional header
* packets may follow.
* This can be used on the first packet of any logical stream to determine if
* that stream is a Theora stream.
* \param _info A #th_info structure to fill in.
* This must have been previously initialized with
* th_info_init().
* The application may immediately begin using the contents of
* this structure after the first header is decoded, though it
* must continue to be passed in on all subsequent calls.
* \param _tc A #th_comment structure to fill in.
* The application may immediately begin using the contents of
* this structure after the second header is decoded, though it
* must continue to be passed in on all subsequent calls.
* \param _setup Returns a pointer to additional, private setup information
* needed by the decoder.
* The contents of this pointer must be initialized to
* <tt>NULL</tt> on the first call, and the returned value must
* continue to be passed in on all subsequent calls.
* \param _op An <tt>ogg_packet</tt> structure which contains one of the
* initial packets of an Ogg logical stream.
* \return A positive value indicates that a Theora header was successfully
* processed.
* \retval 0 The first video data packet was encountered after all
* required header packets were parsed.
* The packet just passed in on this call should be saved
* and fed to th_decode_packetin() to begin decoding
* video data.
* \retval TH_EFAULT One of \a _info, \a _tc, or \a _setup was
* <tt>NULL</tt>.
* \retval TH_EBADHEADER \a _op was <tt>NULL</tt>, the packet was not the next
* header packet in the expected sequence, or the format
* of the header data was invalid.
* \retval TH_EVERSION The packet data was a Theora info header, but for a
* bitstream version not decodable with this version of
* <tt>libtheoradec</tt>.
* \retval TH_ENOTFORMAT The packet was not a Theora header.
*/
extern int th_decode_headerin(th_info *_info,th_comment *_tc,
th_setup_info **_setup,ogg_packet *_op);
/**Allocates a decoder instance.
*
* <b>Security Warning:</b> The Theora format supports very large frame sizes,
* potentially even larger than the address space of a 32-bit machine, and
* creating a decoder context allocates the space for several frames of data.
* If the allocation fails here, your program will crash, possibly at some
* future point because the OS kernel returned a valid memory range and will
* only fail when it tries to map the pages in it the first time they are
* used.
* Even if it succeeds, you may experience a denial of service if the frame
* size is large enough to cause excessive paging.
* If you are integrating libtheora in a larger application where such things
* are undesirable, it is highly recommended that you check the frame size in
* \a _info before calling this function and refuse to decode streams where it
* is larger than some reasonable maximum.
* libtheora will not check this for you, because there may be machines that
* can handle such streams and applications that wish to.
* \param _info A #th_info struct filled via th_decode_headerin().
* \param _setup A #th_setup_info handle returned via
* th_decode_headerin().
* \return The initialized #th_dec_ctx handle.
* \retval NULL If the decoding parameters were invalid.*/
extern th_dec_ctx *th_decode_alloc(const th_info *_info,
const th_setup_info *_setup);
/**Releases all storage used for the decoder setup information.
* This should be called after you no longer want to create any decoders for
* a stream whose headers you have parsed with th_decode_headerin().
* \param _setup The setup information to free.
* This can safely be <tt>NULL</tt>.*/
extern void th_setup_free(th_setup_info *_setup);
/**Decoder control function.
* This is used to provide advanced control of the decoding process.
* \param _dec A #th_dec_ctx handle.
* \param _req The control code to process.
* See \ref decctlcodes "the list of available control codes"
* for details.
* \param _buf The parameters for this control code.
* \param _buf_sz The size of the parameter buffer.*/
extern int th_decode_ctl(th_dec_ctx *_dec,int _req,void *_buf,
size_t _buf_sz);
/**Submits a packet containing encoded video data to the decoder.
* \param _dec A #th_dec_ctx handle.
* \param _op An <tt>ogg_packet</tt> containing encoded video data.
* \param _granpos Returns the granule position of the decoded packet.
* If non-<tt>NULL</tt>, the granule position for this specific
* packet is stored in this location.
* This is computed incrementally from previously decoded
* packets.
* After a seek, the correct granule position must be set via
* #TH_DECCTL_SET_GRANPOS for this to work properly.
* \retval 0 Success.
* A new decoded frame can be retrieved by calling
* th_decode_ycbcr_out().
* \retval TH_DUPFRAME The packet represented a dropped (0-byte) frame.
* The player can skip the call to th_decode_ycbcr_out(),
* as the contents of the decoded frame buffer have not
* changed.
* \retval TH_EFAULT \a _dec or \a _op was <tt>NULL</tt>.
* \retval TH_EBADPACKET \a _op does not contain encoded video data.
* \retval TH_EIMPL The video data uses bitstream features which this
* library does not support.*/
extern int th_decode_packetin(th_dec_ctx *_dec,const ogg_packet *_op,
ogg_int64_t *_granpos);
/**Outputs the next available frame of decoded Y'CbCr data.
* If a striped decode callback has been set with #TH_DECCTL_SET_STRIPE_CB,
* then the application does not need to call this function.
* \param _dec A #th_dec_ctx handle.
* \param _ycbcr A video buffer structure to fill in.
* <tt>libtheoradec</tt> will fill in all the members of this
* structure, including the pointers to the uncompressed video
* data.
* The memory for this video data is owned by
* <tt>libtheoradec</tt>.
* It may be freed or overwritten without notification when
* subsequent frames are decoded.
* \retval 0 Success
* \retval TH_EFAULT \a _dec or \a _ycbcr was <tt>NULL</tt>.
*/
extern int th_decode_ycbcr_out(th_dec_ctx *_dec,
th_ycbcr_buffer _ycbcr);
/**Frees an allocated decoder instance.
* \param _dec A #th_dec_ctx handle.*/
extern void th_decode_free(th_dec_ctx *_dec);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\file
* The <tt>libtheoraenc</tt> C encoding API.*/
#if !defined(_O_THEORA_THEORAENC_H_)
# define _O_THEORA_THEORAENC_H_ (1)
# include <stddef.h>
# include <ogg/ogg.h>
# include "codec.h"
#if defined(__cplusplus)
extern "C" {
#endif
/**\name th_encode_ctl() codes
* \anchor encctlcodes
* These are the available request codes for th_encode_ctl().
* By convention, these are even, to distinguish them from the
* \ref decctlcodes "decoder control codes".
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Sets the Huffman tables to use.
* The tables are copied, not stored by reference, so they can be freed after
* this call.
* <tt>NULL</tt> may be specified to revert to the default tables.
*
* \param[in] _buf <tt>#th_huff_code[#TH_NHUFFMAN_TABLES][#TH_NDCT_TOKENS]</tt>
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL Encoding has already begun or one or more of the given
* tables is not full or prefix-free, \a _buf is
* <tt>NULL</tt> and \a _buf_sz is not zero, or \a _buf is
* non-<tt>NULL</tt> and \a _buf_sz is not
* <tt>sizeof(#th_huff_code)*#TH_NHUFFMAN_TABLES*#TH_NDCT_TOKENS</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_HUFFMAN_CODES (0)
/**Sets the quantization parameters to use.
* The parameters are copied, not stored by reference, so they can be freed
* after this call.
* <tt>NULL</tt> may be specified to revert to the default parameters.
*
* \param[in] _buf #th_quant_info
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL Encoding has already begun, \a _buf is
* <tt>NULL</tt> and \a _buf_sz is not zero,
* or \a _buf is non-<tt>NULL</tt> and
* \a _buf_sz is not <tt>sizeof(#th_quant_info)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUANT_PARAMS (2)
/**Sets the maximum distance between key frames.
* This can be changed during an encode, but will be bounded by
* <tt>1<<th_info#keyframe_granule_shift</tt>.
* If it is set before encoding begins, th_info#keyframe_granule_shift will
* be enlarged appropriately.
*
* \param[in] _buf <tt>ogg_uint32_t</tt>: The maximum distance between key
* frames.
* \param[out] _buf <tt>ogg_uint32_t</tt>: The actual maximum distance set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(ogg_uint32_t)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE (4)
/**Disables any encoder features that would prevent lossless transcoding back
* to VP3.
* This primarily means disabling block-adaptive quantization and always coding
* all four luma blocks in a macro block when 4MV is used.
* It also includes using the VP3 quantization tables and Huffman codes; if you
* set them explicitly after calling this function, the resulting stream will
* not be VP3-compatible.
* If you enable VP3-compatibility when encoding 4:2:2 or 4:4:4 source
* material, or when using a picture region smaller than the full frame (e.g.
* a non-multiple-of-16 width or height), then non-VP3 bitstream features will
* still be disabled, but the stream will still not be VP3-compatible, as VP3
* was not capable of encoding such formats.
* If you call this after encoding has already begun, then the quantization
* tables and codebooks cannot be changed, but the frame-level features will
* be enabled or disabled as requested.
*
* \param[in] _buf <tt>int</tt>: a non-zero value to enable VP3 compatibility,
* or 0 to disable it (the default).
* \param[out] _buf <tt>int</tt>: 1 if all bitstream features required for
* VP3-compatibility could be set, and 0 otherwise.
* The latter will be returned if the pixel format is not
* 4:2:0, the picture region is smaller than the full frame,
* or if encoding has begun, preventing the quantization
* tables and codebooks from being set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_VP3_COMPATIBLE (10)
/**Gets the maximum speed level.
* Higher speed levels favor quicker encoding over better quality per bit.
* Depending on the encoding mode, and the internal algorithms used, quality
* may actually improve, but in this case bitrate will also likely increase.
* In any case, overall rate/distortion performance will probably decrease.
* The maximum value, and the meaning of each value, may change depending on
* the current encoding mode (VBR vs. constant quality, etc.).
*
* \param[out] _buf <tt>int</tt>: The maximum encoding speed level.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL_MAX (12)
/**Sets the speed level.
* The current speed level may be retrieved using #TH_ENCCTL_GET_SPLEVEL.
*
* \param[in] _buf <tt>int</tt>: The new encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* encoding speed level is out of bounds.
* The maximum encoding speed level may be
* implementation- and encoding mode-specific, and can be
* obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_SPLEVEL (14)
/**Gets the current speed level.
* The default speed level may vary according to encoder implementation, but if
* this control code is not supported (it returns #TH_EIMPL), the default may
* be assumed to be the slowest available speed (0).
* The maximum encoding speed level may be implementation- and encoding
* mode-specific, and can be obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
*
* \param[out] _buf <tt>int</tt>: The current encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL (16)
/**Sets the number of duplicates of the next frame to produce.
* Although libtheora can encode duplicate frames very cheaply, it costs some
* amount of CPU to detect them, and a run of duplicates cannot span a
* keyframe boundary.
* This control code tells the encoder to produce the specified number of extra
* duplicates of the next frame.
* This allows the encoder to make smarter keyframe placement decisions and
* rate control decisions, and reduces CPU usage as well, when compared to
* just submitting the same frame for encoding multiple times.
* This setting only applies to the next frame submitted for encoding.
* You MUST call th_encode_packetout() repeatedly until it returns 0, or the
* extra duplicate frames will be lost.
*
* \param[in] _buf <tt>int</tt>: The number of duplicates to produce.
* If this is negative or zero, no duplicates will be produced.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* number of duplicates is greater than or equal to the
* maximum keyframe interval.
* In the latter case, NO duplicate frames will be produced.
* You must ensure that the maximum keyframe interval is set
* larger than the maximum number of duplicates you will
* ever wish to insert prior to encoding.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_DUP_COUNT (18)
/**Modifies the default bitrate management behavior.
* Use to allow or disallow frame dropping, and to enable or disable capping
* bit reservoir overflows and underflows.
* See \ref encctlcodes "the list of available flags".
* The flags are set by default to
* <tt>#TH_RATECTL_DROP_FRAMES|#TH_RATECTL_CAP_OVERFLOW</tt>.
*
* \param[in] _buf <tt>int</tt>: Any combination of
* \ref ratectlflags "the available flags":
* - #TH_RATECTL_DROP_FRAMES: Enable frame dropping.
* - #TH_RATECTL_CAP_OVERFLOW: Don't bank excess bits for later
* use.
* - #TH_RATECTL_CAP_UNDERFLOW: Don't try to make up shortfalls
* later.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt> or rate control
* is not enabled.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_RATE_FLAGS (20)
/**Sets the size of the bitrate management bit reservoir as a function
* of number of frames.
* The reservoir size affects how quickly bitrate management reacts to
* instantaneous changes in the video complexity.
* Larger reservoirs react more slowly, and provide better overall quality, but
* require more buffering by a client, adding more latency to live streams.
* By default, libtheora sets the reservoir to the maximum distance between
* keyframes, subject to a minimum and maximum limit.
* This call may be used to increase or decrease the reservoir, increasing or
* decreasing the allowed temporary variance in bitrate.
* An implementation may impose some limits on the size of a reservoir it can
* handle, in which case the actual reservoir size may not be exactly what was
* requested.
* The actual value set will be returned.
*
* \param[in] _buf <tt>int</tt>: Requested size of the reservoir measured in
* frames.
* \param[out] _buf <tt>int</tt>: The actual size of the reservoir set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or rate control
* is not enabled. The buffer has an implementation
* defined minimum and maximum size and the value in _buf
* will be adjusted to match the actual value set.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_RATE_BUFFER (22)
/**Enable pass 1 of two-pass encoding mode and retrieve the first pass metrics.
* Pass 1 mode must be enabled before the first frame is encoded, and a target
* bitrate must have already been specified to the encoder.
* Although this does not have to be the exact rate that will be used in the
* second pass, closer values may produce better results.
* The first call returns the size of the two-pass header data, along with some
* placeholder content, and sets the encoder into pass 1 mode implicitly.
* This call sets the encoder to pass 1 mode implicitly.
* Then, a subsequent call must be made after each call to
* th_encode_ycbcr_in() to retrieve the metrics for that frame.
* An additional, final call must be made to retrieve the summary data,
* containing such information as the total number of frames, etc.
* This must be stored in place of the placeholder data that was returned
* in the first call, before the frame metrics data.
* All of this data must be presented back to the encoder during pass 2 using
* #TH_ENCCTL_2PASS_IN.
*
* \param[out] <tt>char *</tt>_buf: Returns a pointer to internal storage
* containing the two pass metrics data.
* This storage is only valid until the next call, or until the
* encoder context is freed, and must be copied by the
* application.
* \retval >=0 The number of bytes of metric data available in the
* returned buffer.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(char *)</tt>, no target
* bitrate has been set, or the first call was made after
* the first frame was submitted for encoding.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_2PASS_OUT (24)
/**Submits two-pass encoding metric data collected the first encoding pass to
* the second pass.
* The first call must be made before the first frame is encoded, and a target
* bitrate must have already been specified to the encoder.
* It sets the encoder to pass 2 mode implicitly; this cannot be disabled.
* The encoder may require reading data from some or all of the frames in
* advance, depending on, e.g., the reservoir size used in the second pass.
* You must call this function repeatedly before each frame to provide data
* until either a) it fails to consume all of the data presented or b) all of
* the pass 1 data has been consumed.
* In the first case, you must save the remaining data to be presented after
* the next frame.
* You can call this function with a NULL argument to get an upper bound on
* the number of bytes that will be required before the next frame.
*
* When pass 2 is first enabled, the default bit reservoir is set to the entire
* file; this gives maximum flexibility but can lead to very high peak rates.
* You can subsequently set it to another value with #TH_ENCCTL_SET_RATE_BUFFER
* (e.g., to set it to the keyframe interval for non-live streaming), however,
* you may then need to provide more data before the next frame.
*
* \param[in] _buf <tt>char[]</tt>: A buffer containing the data returned by
* #TH_ENCCTL_2PASS_OUT in pass 1.
* You may pass <tt>NULL</tt> for \a _buf to return an upper
* bound on the number of additional bytes needed before the
* next frame.
* The summary data returned at the end of pass 1 must be at
* the head of the buffer on the first call with a
* non-<tt>NULL</tt> \a _buf, and the placeholder data
* returned at the start of pass 1 should be omitted.
* After each call you should advance this buffer by the number
* of bytes consumed.
* \retval >0 The number of bytes of metric data required/consumed.
* \retval 0 No more data is required before the next frame.
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL No target bitrate has been set, or the first call was
* made after the first frame was submitted for
* encoding.
* \retval TH_ENOTFORMAT The data did not appear to be pass 1 from a compatible
* implementation of this library.
* \retval TH_EBADHEADER The data was invalid; this may be returned when
* attempting to read an aborted pass 1 file that still
* has the placeholder data in place of the summary
* data.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_2PASS_IN (26)
/**Sets the current encoding quality.
* This is only valid so long as no bitrate has been specified, either through
* the #th_info struct used to initialize the encoder or through
* #TH_ENCCTL_SET_BITRATE (this restriction may be relaxed in a future
* version).
* If it is set before the headers are emitted, the target quality encoded in
* them will be updated.
*
* \param[in] _buf <tt>int</tt>: The new target quality, in the range 0...63,
* inclusive.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL A target bitrate has already been specified, or the
* quality index was not in the range 0...63.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUALITY (28)
/**Sets the current encoding bitrate.
* Once a bitrate is set, the encoder must use a rate-controlled mode for all
* future frames (this restriction may be relaxed in a future version).
* If it is set before the headers are emitted, the target bitrate encoded in
* them will be updated.
* Due to the buffer delay, the exact bitrate of each section of the encode is
* not guaranteed.
* The encoder may have already used more bits than allowed for the frames it
* has encoded, expecting to make them up in future frames, or it may have
* used fewer, holding the excess in reserve.
* The exact transition between the two bitrates is not well-defined by this
* API, but may be affected by flags set with #TH_ENCCTL_SET_RATE_FLAGS.
* After a number of frames equal to the buffer delay, one may expect further
* output to average at the target bitrate.
*
* \param[in] _buf <tt>long</tt>: The new target bitrate, in bits per second.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL The target bitrate was not positive.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_BITRATE (30)
/*@}*/
/**\name TH_ENCCTL_SET_RATE_FLAGS flags
* \anchor ratectlflags
* These are the flags available for use with #TH_ENCCTL_SET_RATE_FLAGS.*/
/*@{*/
/**Drop frames to keep within bitrate buffer constraints.
* This can have a severe impact on quality, but is the only way to ensure that
* bitrate targets are met at low rates during sudden bursts of activity.*/
#define TH_RATECTL_DROP_FRAMES (0x1)
/**Ignore bitrate buffer overflows.
* If the encoder uses so few bits that the reservoir of available bits
* overflows, ignore the excess.
* The encoder will not try to use these extra bits in future frames.
* At high rates this may cause the result to be undersized, but allows a
* client to play the stream using a finite buffer; it should normally be
* enabled.*/
#define TH_RATECTL_CAP_OVERFLOW (0x2)
/**Ignore bitrate buffer underflows.
* If the encoder uses so many bits that the reservoir of available bits
* underflows, ignore the deficit.
* The encoder will not try to make up these extra bits in future frames.
* At low rates this may cause the result to be oversized; it should normally
* be disabled.*/
#define TH_RATECTL_CAP_UNDERFLOW (0x4)
/*@}*/
/**The quantization parameters used by VP3.*/
extern const th_quant_info TH_VP31_QUANT_INFO;
/**The Huffman tables used by VP3.*/
extern const th_huff_code
TH_VP31_HUFF_CODES[TH_NHUFFMAN_TABLES][TH_NDCT_TOKENS];
/**\name Encoder state
The following data structure is opaque, and its contents are not publicly
defined by this API.
Referring to its internals directly is unsupported, and may break without
warning.*/
/*@{*/
/**The encoder context.*/
typedef struct th_enc_ctx th_enc_ctx;
/*@}*/
/**\defgroup encfuncs Functions for Encoding*/
/*@{*/
/**\name Functions for encoding
* You must link to <tt>libtheoraenc</tt> and <tt>libtheoradec</tt>
* if you use any of the functions in this section.
*
* The functions are listed in the order they are used in a typical encode.
* The basic steps are:
* - Fill in a #th_info structure with details on the format of the video you
* wish to encode.
* - Allocate a #th_enc_ctx handle with th_encode_alloc().
* - Perform any additional encoder configuration required with
* th_encode_ctl().
* - Repeatedly call th_encode_flushheader() to retrieve all the header
* packets.
* - For each uncompressed frame:
* - Submit the uncompressed frame via th_encode_ycbcr_in()
* - Repeatedly call th_encode_packetout() to retrieve any video data packets
* that are ready.
* - Call th_encode_free() to release all encoder memory.*/
/*@{*/
/**Allocates an encoder instance.
* \param _info A #th_info struct filled with the desired encoding parameters.
* \return The initialized #th_enc_ctx handle.
* \retval NULL If the encoding parameters were invalid.*/
extern th_enc_ctx *th_encode_alloc(const th_info *_info);
/**Encoder control function.
* This is used to provide advanced control the encoding process.
* \param _enc A #th_enc_ctx handle.
* \param _req The control code to process.
* See \ref encctlcodes "the list of available control codes"
* for details.
* \param _buf The parameters for this control code.
* \param _buf_sz The size of the parameter buffer.*/
extern int th_encode_ctl(th_enc_ctx *_enc,int _req,void *_buf,size_t _buf_sz);
/**Outputs the next header packet.
* This should be called repeatedly after encoder initialization until it
* returns 0 in order to get all of the header packets, in order, before
* encoding actual video data.
* \param _enc A #th_enc_ctx handle.
* \param _comments The metadata to place in the comment header, when it is
* encoded.
* \param _op An <tt>ogg_packet</tt> structure to fill.
* All of the elements of this structure will be set,
* including a pointer to the header data.
* The memory for the header data is owned by
* <tt>libtheoraenc</tt>, and may be invalidated when the
* next encoder function is called.
* \return A positive value indicates that a header packet was successfully
* produced.
* \retval 0 No packet was produced, and no more header packets remain.
* \retval TH_EFAULT \a _enc, \a _comments, or \a _op was <tt>NULL</tt>.*/
extern int th_encode_flushheader(th_enc_ctx *_enc,
th_comment *_comments,ogg_packet *_op);
/**Submits an uncompressed frame to the encoder.
* \param _enc A #th_enc_ctx handle.
* \param _ycbcr A buffer of Y'CbCr data to encode.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc or \a _ycbcr is <tt>NULL</tt>.
* \retval TH_EINVAL The buffer size does not match the frame size the encoder
* was initialized with, or encoding has already
* completed.*/
extern int th_encode_ycbcr_in(th_enc_ctx *_enc,th_ycbcr_buffer _ycbcr);
/**Retrieves encoded video data packets.
* This should be called repeatedly after each frame is submitted to flush any
* encoded packets, until it returns 0.
* The encoder will not buffer these packets as subsequent frames are
* compressed, so a failure to do so will result in lost video data.
* \note Currently the encoder operates in a one-frame-in, one-packet-out
* manner.
* However, this may be changed in the future.
* \param _enc A #th_enc_ctx handle.
* \param _last Set this flag to a non-zero value if no more uncompressed
* frames will be submitted.
* This ensures that a proper EOS flag is set on the last packet.
* \param _op An <tt>ogg_packet</tt> structure to fill.
* All of the elements of this structure will be set, including a
* pointer to the video data.
* The memory for the video data is owned by
* <tt>libtheoraenc</tt>, and may be invalidated when the next
* encoder function is called.
* \return A positive value indicates that a video data packet was successfully
* produced.
* \retval 0 No packet was produced, and no more encoded video data
* remains.
* \retval TH_EFAULT \a _enc or \a _op was <tt>NULL</tt>.*/
extern int th_encode_packetout(th_enc_ctx *_enc,int _last,ogg_packet *_op);
/**Frees an allocated encoder instance.
* \param _enc A #th_enc_ctx handle.*/
extern void th_encode_free(th_enc_ctx *_enc);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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<plist version="1.0">
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<key>BuildMachineOSBuild</key>
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<string>Theora</string>
<key>CFBundleGetInfoString</key>
<string>Theora framework 1.1alpha1svn, Copyright © 2002-2009Xiph.Org Foundation</string>
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<string>org.xiph.theora</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
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<string>FMWK</string>
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<string>1.1alpha1svn</string>
<key>CFBundleSignature</key>
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<string>MacOSX</string>
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<string>Theora framework 1.1alpha1svn, Copyright © 2002-2009Xiph.Org Foundation</string>
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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\mainpage
*
* \section intro Introduction
*
* This is the documentation for <tt>libtheora</tt> C API.
* The current reference
* implementation for <a href="http://www.theora.org/">Theora</a>, a free,
* patent-unencumbered video codec.
* Theora is derived from On2's VP3 codec with additional features and
* integration with Ogg multimedia formats by
* <a href="http://www.xiph.org/">the Xiph.Org Foundation</a>.
* Complete documentation of the format itself is available in
* <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>.
*
* \subsection Organization
*
* The functions documented here are actually subdivided into three
* separate libraries:
* - <tt>libtheoraenc</tt> contains the encoder interface,
* described in \ref encfuncs.
* - <tt>libtheoradec</tt> contains the decoder interface and
* routines shared with the encoder.
* You must also link to this if you link to <tt>libtheoraenc</tt>.
* The routines in this library are described in \ref decfuncs and
* \ref basefuncs.
* - <tt>libtheora</tt> contains the \ref oldfuncs.
*
* New code should link to <tt>libtheoradec</tt> and, if using encoder
* features, <tt>libtheoraenc</tt>. Together these two export both
* the standard and the legacy API, so this is all that is needed by
* any code. The older <tt>libtheora</tt> library is provided just for
* compatibility with older build configurations.
*
* In general the recommended 1.x API symbols can be distinguished
* by their <tt>th_</tt> or <tt>TH_</tt> namespace prefix.
* The older, legacy API uses <tt>theora_</tt> or <tt>OC_</tt>
* prefixes instead.
*/
/**\file
* The shared <tt>libtheoradec</tt> and <tt>libtheoraenc</tt> C API.
* You don't need to include this directly.*/
#if !defined(_O_THEORA_CODEC_H_)
# define _O_THEORA_CODEC_H_ (1)
# include <ogg/ogg.h>
#if defined(__cplusplus)
extern "C" {
#endif
/**\name Return codes*/
/*@{*/
/**An invalid pointer was provided.*/
#define TH_EFAULT (-1)
/**An invalid argument was provided.*/
#define TH_EINVAL (-10)
/**The contents of the header were incomplete, invalid, or unexpected.*/
#define TH_EBADHEADER (-20)
/**The header does not belong to a Theora stream.*/
#define TH_ENOTFORMAT (-21)
/**The bitstream version is too high.*/
#define TH_EVERSION (-22)
/**The specified function is not implemented.*/
#define TH_EIMPL (-23)
/**There were errors in the video data packet.*/
#define TH_EBADPACKET (-24)
/**The decoded packet represented a dropped frame.
The player can continue to display the current frame, as the contents of the
decoded frame buffer have not changed.*/
#define TH_DUPFRAME (1)
/*@}*/
/**The currently defined color space tags.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Chapter 4, for exact details on the meaning
* of each of these color spaces.*/
typedef enum{
/**The color space was not specified at the encoder.
It may be conveyed by an external means.*/
TH_CS_UNSPECIFIED,
/**A color space designed for NTSC content.*/
TH_CS_ITU_REC_470M,
/**A color space designed for PAL/SECAM content.*/
TH_CS_ITU_REC_470BG,
/**The total number of currently defined color spaces.*/
TH_CS_NSPACES
}th_colorspace;
/**The currently defined pixel format tags.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 4.4, for details on the precise sample
* locations.*/
typedef enum{
/**Chroma decimation by 2 in both the X and Y directions (4:2:0).
The Cb and Cr chroma planes are half the width and half the
height of the luma plane.*/
TH_PF_420,
/**Currently reserved.*/
TH_PF_RSVD,
/**Chroma decimation by 2 in the X direction (4:2:2).
The Cb and Cr chroma planes are half the width of the luma plane, but full
height.*/
TH_PF_422,
/**No chroma decimation (4:4:4).
The Cb and Cr chroma planes are full width and full height.*/
TH_PF_444,
/**The total number of currently defined pixel formats.*/
TH_PF_NFORMATS
}th_pixel_fmt;
/**A buffer for a single color plane in an uncompressed image.
* This contains the image data in a left-to-right, top-down format.
* Each row of pixels is stored contiguously in memory, but successive
* rows need not be.
* Use \a stride to compute the offset of the next row.
* The encoder accepts both positive \a stride values (top-down in memory)
* and negative (bottom-up in memory).
* The decoder currently always generates images with positive strides.*/
typedef struct{
/**The width of this plane.*/
int width;
/**The height of this plane.*/
int height;
/**The offset in bytes between successive rows.*/
int stride;
/**A pointer to the beginning of the first row.*/
unsigned char *data;
}th_img_plane;
/**A complete image buffer for an uncompressed frame.
* The chroma planes may be decimated by a factor of two in either
* direction, as indicated by th_info#pixel_fmt.
* The width and height of the Y' plane must be multiples of 16.
* They may need to be cropped for display, using the rectangle
* specified by th_info#pic_x, th_info#pic_y, th_info#pic_width,
* and th_info#pic_height.
* All samples are 8 bits.
* \note The term YUV often used to describe a colorspace is ambiguous.
* The exact parameters of the RGB to YUV conversion process aside, in
* many contexts the U and V channels actually have opposite meanings.
* To avoid this confusion, we are explicit: the name of the color
* channels are Y'CbCr, and they appear in that order, always.
* The prime symbol denotes that the Y channel is non-linear.
* Cb and Cr stand for "Chroma blue" and "Chroma red", respectively.*/
typedef th_img_plane th_ycbcr_buffer[3];
/**Theora bitstream information.
* This contains the basic playback parameters for a stream, and corresponds to
* the initial 'info' header packet.
* To initialize an encoder, the application fills in this structure and
* passes it to th_encode_alloc().
* A default encoding mode is chosen based on the values of the #quality and
* #target_bitrate fields.
* On decode, it is filled in by th_decode_headerin(), and then passed to
* th_decode_alloc().
*
* Encoded Theora frames must be a multiple of 16 in size;
* this is what the #frame_width and #frame_height members represent.
* To handle arbitrary picture sizes, a crop rectangle is specified in the
* #pic_x, #pic_y, #pic_width and #pic_height members.
*
* All frame buffers contain pointers to the full, padded frame.
* However, the current encoder <em>will not</em> reference pixels outside of
* the cropped picture region, and the application does not need to fill them
* in.
* The decoder <em>will</em> allocate storage for a full frame, but the
* application <em>should not</em> rely on the padding containing sensible
* data.
*
* It is also generally recommended that the offsets and sizes should still be
* multiples of 2 to avoid chroma sampling shifts when chroma is sub-sampled.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 4.4, for more details.
*
* Frame rate, in frames per second, is stored as a rational fraction, as is
* the pixel aspect ratio.
* Note that this refers to the aspect ratio of the individual pixels, not of
* the overall frame itself.
* The frame aspect ratio can be computed from pixel aspect ratio using the
* image dimensions.*/
typedef struct{
/**\name Theora version
* Bitstream version information.*/
/*@{*/
unsigned char version_major;
unsigned char version_minor;
unsigned char version_subminor;
/*@}*/
/**The encoded frame width.
* This must be a multiple of 16, and less than 1048576.*/
ogg_uint32_t frame_width;
/**The encoded frame height.
* This must be a multiple of 16, and less than 1048576.*/
ogg_uint32_t frame_height;
/**The displayed picture width.
* This must be no larger than width.*/
ogg_uint32_t pic_width;
/**The displayed picture height.
* This must be no larger than height.*/
ogg_uint32_t pic_height;
/**The X offset of the displayed picture.
* This must be no larger than #frame_width-#pic_width or 255, whichever is
* smaller.*/
ogg_uint32_t pic_x;
/**The Y offset of the displayed picture.
* This must be no larger than #frame_height-#pic_height, and
* #frame_height-#pic_height-#pic_y must be no larger than 255.
* This slightly funny restriction is due to the fact that the offset is
* specified from the top of the image for consistency with the standard
* graphics left-handed coordinate system used throughout this API, while
* it is stored in the encoded stream as an offset from the bottom.*/
ogg_uint32_t pic_y;
/**\name Frame rate
* The frame rate, as a fraction.
* If either is 0, the frame rate is undefined.*/
/*@{*/
ogg_uint32_t fps_numerator;
ogg_uint32_t fps_denominator;
/*@}*/
/**\name Aspect ratio
* The aspect ratio of the pixels.
* If either value is zero, the aspect ratio is undefined.
* If not specified by any external means, 1:1 should be assumed.
* The aspect ratio of the full picture can be computed as
* \code
* aspect_numerator*pic_width/(aspect_denominator*pic_height).
* \endcode */
/*@{*/
ogg_uint32_t aspect_numerator;
ogg_uint32_t aspect_denominator;
/*@}*/
/**The color space.*/
th_colorspace colorspace;
/**The pixel format.*/
th_pixel_fmt pixel_fmt;
/**The target bit-rate in bits per second.
If initializing an encoder with this struct, set this field to a non-zero
value to activate CBR encoding by default.*/
int target_bitrate;
/**The target quality level.
Valid values range from 0 to 63, inclusive, with higher values giving
higher quality.
If initializing an encoder with this struct, and #target_bitrate is set
to zero, VBR encoding at this quality will be activated by default.*/
/*Currently this is set so that a qi of 0 corresponds to distortions of 24
times the JND, and each increase by 16 halves that value.
This gives us fine discrimination at low qualities, yet effective rate
control at high qualities.
The qi value 63 is special, however.
For this, the highest quality, we use one half of a JND for our threshold.
Due to the lower bounds placed on allowable quantizers in Theora, we will
not actually be able to achieve quality this good, but this should
provide as close to visually lossless quality as Theora is capable of.
We could lift the quantizer restrictions without breaking VP3.1
compatibility, but this would result in quantized coefficients that are
too large for the current bitstream to be able to store.
We'd have to redesign the token syntax to store these large coefficients,
which would make transcoding complex.*/
int quality;
/**The amount to shift to extract the last keyframe number from the granule
* position.
* This can be at most 31.
* th_info_init() will set this to a default value (currently <tt>6</tt>,
* which is good for streaming applications), but you can set it to 0 to
* make every frame a keyframe.
* The maximum distance between key frames is
* <tt>1<<#keyframe_granule_shift</tt>.
* The keyframe frequency can be more finely controlled with
* #TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE, which can also be adjusted
* during encoding (for example, to force the next frame to be a keyframe),
* but it cannot be set larger than the amount permitted by this field after
* the headers have been output.*/
int keyframe_granule_shift;
}th_info;
/**The comment information.
*
* This structure holds the in-stream metadata corresponding to
* the 'comment' header packet.
* The comment header is meant to be used much like someone jotting a quick
* note on the label of a video.
* It should be a short, to the point text note that can be more than a couple
* words, but not more than a short paragraph.
*
* The metadata is stored as a series of (tag, value) pairs, in
* length-encoded string vectors.
* The first occurrence of the '=' character delimits the tag and value.
* A particular tag may occur more than once, and order is significant.
* The character set encoding for the strings is always UTF-8, but the tag
* names are limited to ASCII, and treated as case-insensitive.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 6.3.3 for details.
*
* In filling in this structure, th_decode_headerin() will null-terminate
* the user_comment strings for safety.
* However, the bitstream format itself treats them as 8-bit clean vectors,
* possibly containing null characters, and so the length array should be
* treated as their authoritative length.
*/
typedef struct th_comment{
/**The array of comment string vectors.*/
char **user_comments;
/**An array of the corresponding length of each vector, in bytes.*/
int *comment_lengths;
/**The total number of comment strings.*/
int comments;
/**The null-terminated vendor string.
This identifies the software used to encode the stream.*/
char *vendor;
}th_comment;
/**A single base matrix.*/
typedef unsigned char th_quant_base[64];
/**A set of \a qi ranges.*/
typedef struct{
/**The number of ranges in the set.*/
int nranges;
/**The size of each of the #nranges ranges.
These must sum to 63.*/
const int *sizes;
/**#nranges <tt>+1</tt> base matrices.
Matrices \a i and <tt>i+1</tt> form the endpoints of range \a i.*/
const th_quant_base *base_matrices;
}th_quant_ranges;
/**A complete set of quantization parameters.
The quantizer for each coefficient is calculated as:
\code
Q=MAX(MIN(qmin[qti][ci!=0],scale[ci!=0][qi]*base[qti][pli][qi][ci]/100),
1024).
\endcode
\a qti is the quantization type index: 0 for intra, 1 for inter.
<tt>ci!=0</tt> is 0 for the DC coefficient and 1 for AC coefficients.
\a qi is the quality index, ranging between 0 (low quality) and 63 (high
quality).
\a pli is the color plane index: 0 for Y', 1 for Cb, 2 for Cr.
\a ci is the DCT coefficient index.
Coefficient indices correspond to the normal 2D DCT block
ordering--row-major with low frequencies first--\em not zig-zag order.
Minimum quantizers are constant, and are given by:
\code
qmin[2][2]={{4,2},{8,4}}.
\endcode
Parameters that can be stored in the bitstream are as follows:
- The two scale matrices ac_scale and dc_scale.
\code
scale[2][64]={dc_scale,ac_scale}.
\endcode
- The base matrices for each \a qi, \a qti and \a pli (up to 384 in all).
In order to avoid storing a full 384 base matrices, only a sparse set of
matrices are stored, and the rest are linearly interpolated.
This is done as follows.
For each \a qti and \a pli, a series of \a n \a qi ranges is defined.
The size of each \a qi range can vary arbitrarily, but they must sum to
63.
Then, <tt>n+1</tt> matrices are specified, one for each endpoint of the
ranges.
For interpolation purposes, each range's endpoints are the first \a qi
value it contains and one past the last \a qi value it contains.
Fractional values are rounded to the nearest integer, with ties rounded
away from zero.
Base matrices are stored by reference, so if the same matrices are used
multiple times, they will only appear once in the bitstream.
The bitstream is also capable of omitting an entire set of ranges and
its associated matrices if they are the same as either the previous
set (indexed in row-major order) or if the inter set is the same as the
intra set.
- Loop filter limit values.
The same limits are used for the loop filter in all color planes, despite
potentially differing levels of quantization in each.
For the current encoder, <tt>scale[ci!=0][qi]</tt> must be no greater
than <tt>scale[ci!=0][qi-1]</tt> and <tt>base[qti][pli][qi][ci]</tt> must
be no greater than <tt>base[qti][pli][qi-1][ci]</tt>.
These two conditions ensure that the actual quantizer for a given \a qti,
\a pli, and \a ci does not increase as \a qi increases.
This is not required by the decoder.*/
typedef struct{
/**The DC scaling factors.*/
ogg_uint16_t dc_scale[64];
/**The AC scaling factors.*/
ogg_uint16_t ac_scale[64];
/**The loop filter limit values.*/
unsigned char loop_filter_limits[64];
/**The \a qi ranges for each \a ci and \a pli.*/
th_quant_ranges qi_ranges[2][3];
}th_quant_info;
/**The number of Huffman tables used by Theora.*/
#define TH_NHUFFMAN_TABLES (80)
/**The number of DCT token values in each table.*/
#define TH_NDCT_TOKENS (32)
/**A Huffman code for a Theora DCT token.
* Each set of Huffman codes in a given table must form a complete, prefix-free
* code.
* There is no requirement that all the tokens in a table have a valid code,
* but the current encoder is not optimized to take advantage of this.
* If each of the five grouops of 16 tables does not contain at least one table
* with a code for every token, then the encoder may fail to encode certain
* frames.
* The complete table in the first group of 16 does not have to be in the same
* place as the complete table in the other groups, but the complete tables in
* the remaining four groups must all be in the same place.*/
typedef struct{
/**The bit pattern for the code, with the LSbit of the pattern aligned in
* the LSbit of the word.*/
ogg_uint32_t pattern;
/**The number of bits in the code.
* This must be between 0 and 32, inclusive.*/
int nbits;
}th_huff_code;
/**\defgroup basefuncs Functions Shared by Encode and Decode*/
/*@{*/
/**\name Basic shared functions*/
/*@{*/
/**Retrieves a human-readable string to identify the library vendor and
* version.
* \return the version string.*/
extern const char *th_version_string(void);
/**Retrieves the library version number.
* This is the highest bitstream version that the encoder library will produce,
* or that the decoder library can decode.
* This number is composed of a 16-bit major version, 8-bit minor version
* and 8 bit sub-version, composed as follows:
* \code
* (VERSION_MAJOR<<16)+(VERSION_MINOR<<8)+(VERSION_SUBMINOR)
* \endcode
* \return the version number.*/
extern ogg_uint32_t th_version_number(void);
/**Converts a granule position to an absolute frame index, starting at
* <tt>0</tt>.
* The granule position is interpreted in the context of a given
* #th_enc_ctx or #th_dec_ctx handle (either will suffice).
* \param _encdec A previously allocated #th_enc_ctx or #th_dec_ctx
* handle.
* \param _granpos The granule position to convert.
* \returns The absolute frame index corresponding to \a _granpos.
* \retval -1 The given granule position was invalid (i.e. negative).*/
extern ogg_int64_t th_granule_frame(void *_encdec,ogg_int64_t _granpos);
/**Converts a granule position to an absolute time in seconds.
* The granule position is interpreted in the context of a given
* #th_enc_ctx or #th_dec_ctx handle (either will suffice).
* \param _encdec A previously allocated #th_enc_ctx or #th_dec_ctx
* handle.
* \param _granpos The granule position to convert.
* \return The absolute time in seconds corresponding to \a _granpos.
* This is the "end time" for the frame, or the latest time it should
* be displayed.
* It is not the presentation time.
* \retval -1 The given granule position was invalid (i.e. negative).*/
extern double th_granule_time(void *_encdec,ogg_int64_t _granpos);
/**Determines whether a Theora packet is a header or not.
* This function does no verification beyond checking the packet type bit, so
* it should not be used for bitstream identification; use
* th_decode_headerin() for that.
* As per the Theora specification, an empty (0-byte) packet is treated as a
* data packet (a delta frame with no coded blocks).
* \param _op An <tt>ogg_packet</tt> containing encoded Theora data.
* \retval 1 The packet is a header packet
* \retval 0 The packet is a video data packet.*/
extern int th_packet_isheader(ogg_packet *_op);
/**Determines whether a theora packet is a key frame or not.
* This function does no verification beyond checking the packet type and
* key frame bits, so it should not be used for bitstream identification; use
* th_decode_headerin() for that.
* As per the Theora specification, an empty (0-byte) packet is treated as a
* delta frame (with no coded blocks).
* \param _op An <tt>ogg_packet</tt> containing encoded Theora data.
* \retval 1 The packet contains a key frame.
* \retval 0 The packet contains a delta frame.
* \retval -1 The packet is not a video data packet.*/
extern int th_packet_iskeyframe(ogg_packet *_op);
/*@}*/
/**\name Functions for manipulating header data*/
/*@{*/
/**Initializes a th_info structure.
* This should be called on a freshly allocated #th_info structure before
* attempting to use it.
* \param _info The #th_info struct to initialize.*/
extern void th_info_init(th_info *_info);
/**Clears a #th_info structure.
* This should be called on a #th_info structure after it is no longer
* needed.
* \param _info The #th_info struct to clear.*/
extern void th_info_clear(th_info *_info);
/**Initialize a #th_comment structure.
* This should be called on a freshly allocated #th_comment structure
* before attempting to use it.
* \param _tc The #th_comment struct to initialize.*/
extern void th_comment_init(th_comment *_tc);
/**Add a comment to an initialized #th_comment structure.
* \note Neither th_comment_add() nor th_comment_add_tag() support
* comments containing null values, although the bitstream format does
* support them.
* To add such comments you will need to manipulate the #th_comment
* structure directly.
* \param _tc The #th_comment struct to add the comment to.
* \param _comment Must be a null-terminated UTF-8 string containing the
* comment in "TAG=the value" form.*/
extern void th_comment_add(th_comment *_tc, char *_comment);
/**Add a comment to an initialized #th_comment structure.
* \note Neither th_comment_add() nor th_comment_add_tag() support
* comments containing null values, although the bitstream format does
* support them.
* To add such comments you will need to manipulate the #th_comment
* structure directly.
* \param _tc The #th_comment struct to add the comment to.
* \param _tag A null-terminated string containing the tag associated with
* the comment.
* \param _val The corresponding value as a null-terminated string.*/
extern void th_comment_add_tag(th_comment *_tc,char *_tag,char *_val);
/**Look up a comment value by its tag.
* \param _tc An initialized #th_comment structure.
* \param _tag The tag to look up.
* \param _count The instance of the tag.
* The same tag can appear multiple times, each with a distinct
* value, so an index is required to retrieve them all.
* The order in which these values appear is significant and
* should be preserved.
* Use th_comment_query_count() to get the legal range for
* the \a _count parameter.
* \return A pointer to the queried tag's value.
* This points directly to data in the #th_comment structure.
* It should not be modified or freed by the application, and
* modifications to the structure may invalidate the pointer.
* \retval NULL If no matching tag is found.*/
extern char *th_comment_query(th_comment *_tc,char *_tag,int _count);
/**Look up the number of instances of a tag.
* Call this first when querying for a specific tag and then iterate over the
* number of instances with separate calls to th_comment_query() to
* retrieve all the values for that tag in order.
* \param _tc An initialized #th_comment structure.
* \param _tag The tag to look up.
* \return The number on instances of this particular tag.*/
extern int th_comment_query_count(th_comment *_tc,char *_tag);
/**Clears a #th_comment structure.
* This should be called on a #th_comment structure after it is no longer
* needed.
* It will free all memory used by the structure members.
* \param _tc The #th_comment struct to clear.*/
extern void th_comment_clear(th_comment *_tc);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.17 2003/12/06 18:06:19 arc Exp $
********************************************************************/
#ifndef _O_THEORA_H_
#define _O_THEORA_H_
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
#include <stddef.h> /* for size_t */
#include <ogg/ogg.h>
/** \file
* The libtheora pre-1.0 legacy C API.
*
* \ingroup oldfuncs
*
* \section intro Introduction
*
* This is the documentation for the libtheora legacy C API, declared in
* the theora.h header, which describes the old interface used before
* the 1.0 release. This API was widely deployed for several years and
* remains supported, but for new code we recommend the cleaner API
* declared in theoradec.h and theoraenc.h.
*
* libtheora is the reference implementation for
* <a href="http://www.theora.org/">Theora</a>, a free video codec.
* Theora is derived from On2's VP3 codec with improved integration with
* Ogg multimedia formats by <a href="http://www.xiph.org/">Xiph.Org</a>.
*
* \section overview Overview
*
* This library will both decode and encode theora packets to/from raw YUV
* frames. In either case, the packets will most likely either come from or
* need to be embedded in an Ogg stream. Use
* <a href="http://xiph.org/ogg/">libogg</a> or
* <a href="http://www.annodex.net/software/liboggz/index.html">liboggz</a>
* to extract/package these packets.
*
* \section decoding Decoding Process
*
* Decoding can be separated into the following steps:
* -# initialise theora_info and theora_comment structures using
* theora_info_init() and theora_comment_init():
\verbatim
theora_info info;
theora_comment comment;
theora_info_init(&info);
theora_comment_init(&comment);
\endverbatim
* -# retrieve header packets from Ogg stream (there should be 3) and decode
* into theora_info and theora_comment structures using
* theora_decode_header(). See \ref identification for more information on
* identifying which packets are theora packets.
\verbatim
int i;
for (i = 0; i < 3; i++)
{
(get a theora packet "op" from the Ogg stream)
theora_decode_header(&info, &comment, op);
}
\endverbatim
* -# initialise the decoder based on the information retrieved into the
* theora_info struct by theora_decode_header(). You will need a
* theora_state struct.
\verbatim
theora_state state;
theora_decode_init(&state, &info);
\endverbatim
* -# pass in packets and retrieve decoded frames! See the yuv_buffer
* documentation for information on how to retrieve raw YUV data.
\verbatim
yuf_buffer buffer;
while (last packet was not e_o_s) {
(get a theora packet "op" from the Ogg stream)
theora_decode_packetin(&state, op);
theora_decode_YUVout(&state, &buffer);
}
\endverbatim
*
*
* \subsection identification Identifying Theora Packets
*
* All streams inside an Ogg file have a unique serial_no attached to the
* stream. Typically, you will want to
* - retrieve the serial_no for each b_o_s (beginning of stream) page
* encountered within the Ogg file;
* - test the first (only) packet on that page to determine if it is a theora
* packet;
* - once you have found a theora b_o_s page then use the retrieved serial_no
* to identify future packets belonging to the same theora stream.
*
* Note that you \e cannot use theora_packet_isheader() to determine if a
* packet is a theora packet or not, as this function does not perform any
* checking beyond whether a header bit is present. Instead, use the
* theora_decode_header() function and check the return value; or examine the
* header bytes at the beginning of the Ogg page.
*/
/** \defgroup oldfuncs Legacy pre-1.0 C API */
/* @{ */
/**
* A YUV buffer for passing uncompressed frames to and from the codec.
* This holds a Y'CbCr frame in planar format. The CbCr planes can be
* subsampled and have their own separate dimensions and row stride
* offsets. Note that the strides may be negative in some
* configurations. For theora the width and height of the largest plane
* must be a multiple of 16. The actual meaningful picture size and
* offset are stored in the theora_info structure; frames returned by
* the decoder may need to be cropped for display.
*
* All samples are 8 bits. Within each plane samples are ordered by
* row from the top of the frame to the bottom. Within each row samples
* are ordered from left to right.
*
* During decode, the yuv_buffer struct is allocated by the user, but all
* fields (including luma and chroma pointers) are filled by the library.
* These pointers address library-internal memory and their contents should
* not be modified.
*
* Conversely, during encode the user allocates the struct and fills out all
* fields. The user also manages the data addressed by the luma and chroma
* pointers. See the encoder_example.c and dump_video.c example files in
* theora/examples/ for more information.
*/
typedef struct {
int y_width; /**< Width of the Y' luminance plane */
int y_height; /**< Height of the luminance plane */
int y_stride; /**< Offset in bytes between successive rows */
int uv_width; /**< Width of the Cb and Cr chroma planes */
int uv_height; /**< Height of the chroma planes */
int uv_stride; /**< Offset between successive chroma rows */
unsigned char *y; /**< Pointer to start of luminance data */
unsigned char *u; /**< Pointer to start of Cb data */
unsigned char *v; /**< Pointer to start of Cr data */
} yuv_buffer;
/**
* A Colorspace.
*/
typedef enum {
OC_CS_UNSPECIFIED, /**< The colorspace is unknown or unspecified */
OC_CS_ITU_REC_470M, /**< This is the best option for 'NTSC' content */
OC_CS_ITU_REC_470BG, /**< This is the best option for 'PAL' content */
OC_CS_NSPACES /**< This marks the end of the defined colorspaces */
} theora_colorspace;
/**
* A Chroma subsampling
*
* These enumerate the available chroma subsampling options supported
* by the theora format. See Section 4.4 of the specification for
* exact definitions.
*/
typedef enum {
OC_PF_420, /**< Chroma subsampling by 2 in each direction (4:2:0) */
OC_PF_RSVD, /**< Reserved value */
OC_PF_422, /**< Horizonatal chroma subsampling by 2 (4:2:2) */
OC_PF_444, /**< No chroma subsampling at all (4:4:4) */
} theora_pixelformat;
/**
* Theora bitstream info.
* Contains the basic playback parameters for a stream,
* corresponding to the initial 'info' header packet.
*
* Encoded theora frames must be a multiple of 16 in width and height.
* To handle other frame sizes, a crop rectangle is specified in
* frame_height and frame_width, offset_x and * offset_y. The offset
* and size should still be a multiple of 2 to avoid chroma sampling
* shifts. Offset values in this structure are measured from the
* upper left of the image.
*
* Frame rate, in frames per second, is stored as a rational
* fraction. Aspect ratio is also stored as a rational fraction, and
* refers to the aspect ratio of the frame pixels, not of the
* overall frame itself.
*
* See <a href="http://svn.xiph.org/trunk/theora/examples/encoder_example.c">
* examples/encoder_example.c</a> for usage examples of the
* other paramters and good default settings for the encoder parameters.
*/
typedef struct {
ogg_uint32_t width; /**< encoded frame width */
ogg_uint32_t height; /**< encoded frame height */
ogg_uint32_t frame_width; /**< display frame width */
ogg_uint32_t frame_height; /**< display frame height */
ogg_uint32_t offset_x; /**< horizontal offset of the displayed frame */
ogg_uint32_t offset_y; /**< vertical offset of the displayed frame */
ogg_uint32_t fps_numerator; /**< frame rate numerator **/
ogg_uint32_t fps_denominator; /**< frame rate denominator **/
ogg_uint32_t aspect_numerator; /**< pixel aspect ratio numerator */
ogg_uint32_t aspect_denominator; /**< pixel aspect ratio denominator */
theora_colorspace colorspace; /**< colorspace */
int target_bitrate; /**< nominal bitrate in bits per second */
int quality; /**< Nominal quality setting, 0-63 */
int quick_p; /**< Quick encode/decode */
/* decode only */
unsigned char version_major;
unsigned char version_minor;
unsigned char version_subminor;
void *codec_setup;
/* encode only */
int dropframes_p;
int keyframe_auto_p;
ogg_uint32_t keyframe_frequency;
ogg_uint32_t keyframe_frequency_force; /* also used for decode init to
get granpos shift correct */
ogg_uint32_t keyframe_data_target_bitrate;
ogg_int32_t keyframe_auto_threshold;
ogg_uint32_t keyframe_mindistance;
ogg_int32_t noise_sensitivity;
ogg_int32_t sharpness;
theora_pixelformat pixelformat; /**< chroma subsampling mode to expect */
} theora_info;
/** Codec internal state and context.
*/
typedef struct{
theora_info *i;
ogg_int64_t granulepos;
void *internal_encode;
void *internal_decode;
} theora_state;
/**
* Comment header metadata.
*
* This structure holds the in-stream metadata corresponding to
* the 'comment' header packet.
*
* Meta data is stored as a series of (tag, value) pairs, in
* length-encoded string vectors. The first occurence of the
* '=' character delimits the tag and value. A particular tag
* may occur more than once. The character set encoding for
* the strings is always UTF-8, but the tag names are limited
* to case-insensitive ASCII. See the spec for details.
*
* In filling in this structure, theora_decode_header() will
* null-terminate the user_comment strings for safety. However,
* the bitstream format itself treats them as 8-bit clean,
* and so the length array should be treated as authoritative
* for their length.
*/
typedef struct theora_comment{
char **user_comments; /**< An array of comment string vectors */
int *comment_lengths; /**< An array of corresponding string vector lengths in bytes */
int comments; /**< The total number of comment string vectors */
char *vendor; /**< The vendor string identifying the encoder, null terminated */
} theora_comment;
/**\name theora_control() codes */
/* \anchor decctlcodes_old
* These are the available request codes for theora_control()
* when called with a decoder instance.
* By convention decoder control codes are odd, to distinguish
* them from \ref encctlcodes_old "encoder control codes" which
* are even.
*
* Note that since the 1.0 release, both the legacy and the final
* implementation accept all the same control codes, but only the
* final API declares the newer codes.
*
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Get the maximum post-processing level.
* The decoder supports a post-processing filter that can improve
* the appearance of the decoded images. This returns the highest
* level setting for this post-processor, corresponding to maximum
* improvement and computational expense.
*/
#define TH_DECCTL_GET_PPLEVEL_MAX (1)
/**Set the post-processing level.
* Sets the level of post-processing to use when decoding the
* compressed stream. This must be a value between zero (off)
* and the maximum returned by TH_DECCTL_GET_PPLEVEL_MAX.
*/
#define TH_DECCTL_SET_PPLEVEL (3)
/**Sets the maximum distance between key frames.
* This can be changed during an encode, but will be bounded by
* <tt>1<<th_info#keyframe_granule_shift</tt>.
* If it is set before encoding begins, th_info#keyframe_granule_shift will
* be enlarged appropriately.
*
* \param[in] buf <tt>ogg_uint32_t</tt>: The maximum distance between key
* frames.
* \param[out] buf <tt>ogg_uint32_t</tt>: The actual maximum distance set.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(ogg_uint32_t)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE (4)
/**Set the granule position.
* Call this after a seek, to update the internal granulepos
* in the decoder, to insure that subsequent frames are marked
* properly. If you track timestamps yourself and do not use
* the granule postion returned by the decoder, then you do
* not need to use this control.
*/
#define TH_DECCTL_SET_GRANPOS (5)
/**\anchor encctlcodes_old */
/**Sets the quantization parameters to use.
* The parameters are copied, not stored by reference, so they can be freed
* after this call.
* <tt>NULL</tt> may be specified to revert to the default parameters.
*
* \param[in] buf #th_quant_info
* \retval OC_FAULT \a theora_state is <tt>NULL</tt>.
* \retval OC_EINVAL Encoding has already begun, the quantization parameters
* are not acceptable to this version of the encoder,
* \a buf is <tt>NULL</tt> and \a buf_sz is not zero,
* or \a buf is non-<tt>NULL</tt> and \a buf_sz is
* not <tt>sizeof(#th_quant_info)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUANT_PARAMS (2)
/**Disables any encoder features that would prevent lossless transcoding back
* to VP3.
* This primarily means disabling block-level QI values and not using 4MV mode
* when any of the luma blocks in a macro block are not coded.
* It also includes using the VP3 quantization tables and Huffman codes; if you
* set them explicitly after calling this function, the resulting stream will
* not be VP3-compatible.
* If you enable VP3-compatibility when encoding 4:2:2 or 4:4:4 source
* material, or when using a picture region smaller than the full frame (e.g.
* a non-multiple-of-16 width or height), then non-VP3 bitstream features will
* still be disabled, but the stream will still not be VP3-compatible, as VP3
* was not capable of encoding such formats.
* If you call this after encoding has already begun, then the quantization
* tables and codebooks cannot be changed, but the frame-level features will
* be enabled or disabled as requested.
*
* \param[in] buf <tt>int</tt>: a non-zero value to enable VP3 compatibility,
* or 0 to disable it (the default).
* \param[out] buf <tt>int</tt>: 1 if all bitstream features required for
* VP3-compatibility could be set, and 0 otherwise.
* The latter will be returned if the pixel format is not
* 4:2:0, the picture region is smaller than the full frame,
* or if encoding has begun, preventing the quantization
* tables and codebooks from being set.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_VP3_COMPATIBLE (10)
/**Gets the maximum speed level.
* Higher speed levels favor quicker encoding over better quality per bit.
* Depending on the encoding mode, and the internal algorithms used, quality
* may actually improve, but in this case bitrate will also likely increase.
* In any case, overall rate/distortion performance will probably decrease.
* The maximum value, and the meaning of each value, may change depending on
* the current encoding mode (VBR vs. CQI, etc.).
*
* \param[out] buf int: The maximum encoding speed level.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>.
* \retval OC_IMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL_MAX (12)
/**Sets the speed level.
* By default a speed value of 1 is used.
*
* \param[in] buf int: The new encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>, or the
* encoding speed level is out of bounds.
* The maximum encoding speed level may be
* implementation- and encoding mode-specific, and can be
* obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
* \retval OC_IMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_SPLEVEL (14)
/*@}*/
#define OC_FAULT -1 /**< General failure */
#define OC_EINVAL -10 /**< Library encountered invalid internal data */
#define OC_DISABLED -11 /**< Requested action is disabled */
#define OC_BADHEADER -20 /**< Header packet was corrupt/invalid */
#define OC_NOTFORMAT -21 /**< Packet is not a theora packet */
#define OC_VERSION -22 /**< Bitstream version is not handled */
#define OC_IMPL -23 /**< Feature or action not implemented */
#define OC_BADPACKET -24 /**< Packet is corrupt */
#define OC_NEWPACKET -25 /**< Packet is an (ignorable) unhandled extension */
#define OC_DUPFRAME 1 /**< Packet is a dropped frame */
/**
* Retrieve a human-readable string to identify the encoder vendor and version.
* \returns A version string.
*/
extern const char *theora_version_string(void);
/**
* Retrieve a 32-bit version number.
* This number is composed of a 16-bit major version, 8-bit minor version
* and 8 bit sub-version, composed as follows:
<pre>
(VERSION_MAJOR<<16) + (VERSION_MINOR<<8) + (VERSION_SUB)
</pre>
* \returns The version number.
*/
extern ogg_uint32_t theora_version_number(void);
/**
* Initialize the theora encoder.
* \param th The theora_state handle to initialize for encoding.
* \param ti A theora_info struct filled with the desired encoding parameters.
* \retval 0 Success
*/
extern int theora_encode_init(theora_state *th, theora_info *ti);
/**
* Submit a YUV buffer to the theora encoder.
* \param t A theora_state handle previously initialized for encoding.
* \param yuv A buffer of YUV data to encode. Note that both the yuv_buffer
* struct and the luma/chroma buffers within should be allocated by
* the user.
* \retval OC_EINVAL Encoder is not ready, or is finished.
* \retval -1 The size of the given frame differs from those previously input
* \retval 0 Success
*/
extern int theora_encode_YUVin(theora_state *t, yuv_buffer *yuv);
/**
* Request the next packet of encoded video.
* The encoded data is placed in a user-provided ogg_packet structure.
* \param t A theora_state handle previously initialized for encoding.
* \param last_p whether this is the last packet the encoder should produce.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to encoded
* data. The memory for the encoded data is owned by libtheora.
* \retval 0 No internal storage exists OR no packet is ready
* \retval -1 The encoding process has completed
* \retval 1 Success
*/
extern int theora_encode_packetout( theora_state *t, int last_p,
ogg_packet *op);
/**
* Request a packet containing the initial header.
* A pointer to the header data is placed in a user-provided ogg_packet
* structure.
* \param t A theora_state handle previously initialized for encoding.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the header
* data. The memory for the header data is owned by libtheora.
* \retval 0 Success
*/
extern int theora_encode_header(theora_state *t, ogg_packet *op);
/**
* Request a comment header packet from provided metadata.
* A pointer to the comment data is placed in a user-provided ogg_packet
* structure.
* \param tc A theora_comment structure filled with the desired metadata
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the encoded
* comment data. The memory for the comment data is owned by
* libtheora.
* \retval 0 Success
*/
extern int theora_encode_comment(theora_comment *tc, ogg_packet *op);
/**
* Request a packet containing the codebook tables for the stream.
* A pointer to the codebook data is placed in a user-provided ogg_packet
* structure.
* \param t A theora_state handle previously initialized for encoding.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the codebook
* data. The memory for the header data is owned by libtheora.
* \retval 0 Success
*/
extern int theora_encode_tables(theora_state *t, ogg_packet *op);
/**
* Decode an Ogg packet, with the expectation that the packet contains
* an initial header, comment data or codebook tables.
*
* \param ci A theora_info structure to fill. This must have been previously
* initialized with theora_info_init(). If \a op contains an initial
* header, theora_decode_header() will fill \a ci with the
* parsed header values. If \a op contains codebook tables,
* theora_decode_header() will parse these and attach an internal
* representation to \a ci->codec_setup.
* \param cc A theora_comment structure to fill. If \a op contains comment
* data, theora_decode_header() will fill \a cc with the parsed
* comments.
* \param op An ogg_packet structure which you expect contains an initial
* header, comment data or codebook tables.
*
* \retval OC_BADHEADER \a op is NULL; OR the first byte of \a op->packet
* has the signature of an initial packet, but op is
* not a b_o_s packet; OR this packet has the signature
* of an initial header packet, but an initial header
* packet has already been seen; OR this packet has the
* signature of a comment packet, but the initial header
* has not yet been seen; OR this packet has the signature
* of a comment packet, but contains invalid data; OR
* this packet has the signature of codebook tables,
* but the initial header or comments have not yet
* been seen; OR this packet has the signature of codebook
* tables, but contains invalid data;
* OR the stream being decoded has a compatible version
* but this packet does not have the signature of a
* theora initial header, comments, or codebook packet
* \retval OC_VERSION The packet data of \a op is an initial header with
* a version which is incompatible with this version of
* libtheora.
* \retval OC_NEWPACKET the stream being decoded has an incompatible (future)
* version and contains an unknown signature.
* \retval 0 Success
*
* \note The normal usage is that theora_decode_header() be called on the
* first three packets of a theora logical bitstream in succession.
*/
extern int theora_decode_header(theora_info *ci, theora_comment *cc,
ogg_packet *op);
/**
* Initialize a theora_state handle for decoding.
* \param th The theora_state handle to initialize.
* \param c A theora_info struct filled with the desired decoding parameters.
* This is of course usually obtained from a previous call to
* theora_decode_header().
* \retval 0 Success
*/
extern int theora_decode_init(theora_state *th, theora_info *c);
/**
* Input a packet containing encoded data into the theora decoder.
* \param th A theora_state handle previously initialized for decoding.
* \param op An ogg_packet containing encoded theora data.
* \retval 0 Success
* \retval OC_BADPACKET \a op does not contain encoded video data
*/
extern int theora_decode_packetin(theora_state *th,ogg_packet *op);
/**
* Output the next available frame of decoded YUV data.
* \param th A theora_state handle previously initialized for decoding.
* \param yuv A yuv_buffer in which libtheora should place the decoded data.
* Note that the buffer struct itself is allocated by the user, but
* that the luma and chroma pointers will be filled in by the
* library. Also note that these luma and chroma regions should be
* considered read-only by the user.
* \retval 0 Success
*/
extern int theora_decode_YUVout(theora_state *th,yuv_buffer *yuv);
/**
* Report whether a theora packet is a header or not
* This function does no verification beyond checking the header
* flag bit so it should not be used for bitstream identification;
* use theora_decode_header() for that.
*
* \param op An ogg_packet containing encoded theora data.
* \retval 1 The packet is a header packet
* \retval 0 The packet is not a header packet (and so contains frame data)
*
* Thus function was added in the 1.0alpha4 release.
*/
extern int theora_packet_isheader(ogg_packet *op);
/**
* Report whether a theora packet is a keyframe or not
*
* \param op An ogg_packet containing encoded theora data.
* \retval 1 The packet contains a keyframe image
* \retval 0 The packet is contains an interframe delta
* \retval -1 The packet is not an image data packet at all
*
* Thus function was added in the 1.0alpha4 release.
*/
extern int theora_packet_iskeyframe(ogg_packet *op);
/**
* Report the granulepos shift radix
*
* When embedded in Ogg, Theora uses a two-part granulepos,
* splitting the 64-bit field into two pieces. The more-significant
* section represents the frame count at the last keyframe,
* and the less-significant section represents the count of
* frames since the last keyframe. In this way the overall
* field is still non-decreasing with time, but usefully encodes
* a pointer to the last keyframe, which is necessary for
* correctly restarting decode after a seek.
*
* This function reports the number of bits used to represent
* the distance to the last keyframe, and thus how the granulepos
* field must be shifted or masked to obtain the two parts.
*
* Since libtheora returns compressed data in an ogg_packet
* structure, this may be generally useful even if the Theora
* packets are not being used in an Ogg container.
*
* \param ti A previously initialized theora_info struct
* \returns The bit shift dividing the two granulepos fields
*
* This function was added in the 1.0alpha5 release.
*/
int theora_granule_shift(theora_info *ti);
/**
* Convert a granulepos to an absolute frame index, starting at 0.
* The granulepos is interpreted in the context of a given theora_state handle.
*
* Note that while the granulepos encodes the frame count (i.e. starting
* from 1) this call returns the frame index, starting from zero. Thus
* One can calculate the presentation time by multiplying the index by
* the rate.
*
* \param th A previously initialized theora_state handle (encode or decode)
* \param granulepos The granulepos to convert.
* \returns The frame index corresponding to \a granulepos.
* \retval -1 The given granulepos is undefined (i.e. negative)
*
* Thus function was added in the 1.0alpha4 release.
*/
extern ogg_int64_t theora_granule_frame(theora_state *th,ogg_int64_t granulepos);
/**
* Convert a granulepos to absolute time in seconds. The granulepos is
* interpreted in the context of a given theora_state handle, and gives
* the end time of a frame's presentation as used in Ogg mux ordering.
*
* \param th A previously initialized theora_state handle (encode or decode)
* \param granulepos The granulepos to convert.
* \returns The absolute time in seconds corresponding to \a granulepos.
* This is the "end time" for the frame, or the latest time it should
* be displayed.
* It is not the presentation time.
* \retval -1. The given granulepos is undefined (i.e. negative), or
* \retval -1. The function has been disabled because floating
* point support is not available.
*/
extern double theora_granule_time(theora_state *th,ogg_int64_t granulepos);
/**
* Initialize a theora_info structure. All values within the given theora_info
* structure are initialized, and space is allocated within libtheora for
* internal codec setup data.
* \param c A theora_info struct to initialize.
*/
extern void theora_info_init(theora_info *c);
/**
* Clear a theora_info structure. All values within the given theora_info
* structure are cleared, and associated internal codec setup data is freed.
* \param c A theora_info struct to initialize.
*/
extern void theora_info_clear(theora_info *c);
/**
* Free all internal data associated with a theora_state handle.
* \param t A theora_state handle.
*/
extern void theora_clear(theora_state *t);
/**
* Initialize an allocated theora_comment structure
* \param tc An allocated theora_comment structure
**/
extern void theora_comment_init(theora_comment *tc);
/**
* Add a comment to an initialized theora_comment structure
* \param tc A previously initialized theora comment structure
* \param comment A null-terminated string encoding the comment in the form
* "TAG=the value"
*
* Neither theora_comment_add() nor theora_comment_add_tag() support
* comments containing null values, although the bitstream format
* supports this. To add such comments you will need to manipulate
* the theora_comment structure directly.
**/
extern void theora_comment_add(theora_comment *tc, char *comment);
/**
* Add a comment to an initialized theora_comment structure.
* \param tc A previously initialized theora comment structure
* \param tag A null-terminated string containing the tag
* associated with the comment.
* \param value The corresponding value as a null-terminated string
*
* Neither theora_comment_add() nor theora_comment_add_tag() support
* comments containing null values, although the bitstream format
* supports this. To add such comments you will need to manipulate
* the theora_comment structure directly.
**/
extern void theora_comment_add_tag(theora_comment *tc,
char *tag, char *value);
/**
* Look up a comment value by tag.
* \param tc Tn initialized theora_comment structure
* \param tag The tag to look up
* \param count The instance of the tag. The same tag can appear multiple
* times, each with a distinct and ordered value, so an index
* is required to retrieve them all.
* \returns A pointer to the queried tag's value
* \retval NULL No matching tag is found
*
* \note Use theora_comment_query_count() to get the legal range for the
* count parameter.
**/
extern char *theora_comment_query(theora_comment *tc, char *tag, int count);
/** Look up the number of instances of a tag.
* \param tc An initialized theora_comment structure
* \param tag The tag to look up
* \returns The number on instances of a particular tag.
*
* Call this first when querying for a specific tag and then interate
* over the number of instances with separate calls to
* theora_comment_query() to retrieve all instances in order.
**/
extern int theora_comment_query_count(theora_comment *tc, char *tag);
/**
* Clear an allocated theora_comment struct so that it can be freed.
* \param tc An allocated theora_comment structure.
**/
extern void theora_comment_clear(theora_comment *tc);
/**Encoder control function.
* This is used to provide advanced control the encoding process.
* \param th A #theora_state handle.
* \param req The control code to process.
* See \ref encctlcodes_old "the list of available
* control codes" for details.
* \param buf The parameters for this control code.
* \param buf_sz The size of the parameter buffer.*/
extern int theora_control(theora_state *th,int req,void *buf,size_t buf_sz);
/* @} */ /* end oldfuncs doxygen group */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _O_THEORA_H_ */

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@ -0,0 +1,325 @@
/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\file
* The <tt>libtheoradec</tt> C decoding API.*/
#if !defined(_O_THEORA_THEORADEC_H_)
# define _O_THEORA_THEORADEC_H_ (1)
# include <stddef.h>
# include <ogg/ogg.h>
# include "codec.h"
#if defined(__cplusplus)
extern "C" {
#endif
/**\name th_decode_ctl() codes
* \anchor decctlcodes
* These are the available request codes for th_decode_ctl().
* By convention, these are odd, to distinguish them from the
* \ref encctlcodes "encoder control codes".
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Gets the maximum post-processing level.
* The decoder supports a post-processing filter that can improve
* the appearance of the decoded images. This returns the highest
* level setting for this post-processor, corresponding to maximum
* improvement and computational expense.
*
* \param[out] _buf int: The maximum post-processing level.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_DECCTL_GET_PPLEVEL_MAX (1)
/**Sets the post-processing level.
* By default, post-processing is disabled.
*
* Sets the level of post-processing to use when decoding the
* compressed stream. This must be a value between zero (off)
* and the maximum returned by TH_DECCTL_GET_PPLEVEL_MAX.
*
* \param[in] _buf int: The new post-processing level.
* 0 to disable; larger values use more CPU.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* post-processing level is out of bounds.
* The maximum post-processing level may be
* implementation-specific, and can be obtained via
* #TH_DECCTL_GET_PPLEVEL_MAX.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_DECCTL_SET_PPLEVEL (3)
/**Sets the granule position.
* Call this after a seek, before decoding the first frame, to ensure that the
* proper granule position is returned for all subsequent frames.
* If you track timestamps yourself and do not use the granule position
* returned by the decoder, then you need not call this function.
*
* \param[in] _buf <tt>ogg_int64_t</tt>: The granule position of the next
* frame.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(ogg_int64_t)</tt>, or the
* granule position is negative.*/
#define TH_DECCTL_SET_GRANPOS (5)
/**Sets the striped decode callback function.
* If set, this function will be called as each piece of a frame is fully
* decoded in th_decode_packetin().
* You can pass in a #th_stripe_callback with
* th_stripe_callback#stripe_decoded set to <tt>NULL</tt> to disable the
* callbacks at any point.
* Enabling striped decode does not prevent you from calling
* th_decode_ycbcr_out() after the frame is fully decoded.
*
* \param[in] _buf #th_stripe_callback: The callback parameters.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not
* <tt>sizeof(th_stripe_callback)</tt>.*/
#define TH_DECCTL_SET_STRIPE_CB (7)
/**Enables telemetry and sets the macroblock display mode */
#define TH_DECCTL_SET_TELEMETRY_MBMODE (9)
/**Enables telemetry and sets the motion vector display mode */
#define TH_DECCTL_SET_TELEMETRY_MV (11)
/**Enables telemetry and sets the adaptive quantization display mode */
#define TH_DECCTL_SET_TELEMETRY_QI (13)
/**Enables telemetry and sets the bitstream breakdown visualization mode */
#define TH_DECCTL_SET_TELEMETRY_BITS (15)
/*@}*/
/**A callback function for striped decode.
* This is a function pointer to an application-provided function that will be
* called each time a section of the image is fully decoded in
* th_decode_packetin().
* This allows the application to process the section immediately, while it is
* still in cache.
* Note that the frame is decoded bottom to top, so \a _yfrag0 will steadily
* decrease with each call until it reaches 0, at which point the full frame
* is decoded.
* The number of fragment rows made available in each call depends on the pixel
* format and the number of post-processing filters enabled, and may not even
* be constant for the entire frame.
* If a non-<tt>NULL</tt> \a _granpos pointer is passed to
* th_decode_packetin(), the granule position for the frame will be stored
* in it before the first callback is made.
* If an entire frame is dropped (a 0-byte packet), then no callbacks will be
* made at all for that frame.
* \param _ctx An application-provided context pointer.
* \param _buf The image buffer for the decoded frame.
* \param _yfrag0 The Y coordinate of the first row of 8x8 fragments
* decoded.
* Multiply this by 8 to obtain the pixel row number in the
* luma plane.
* If the chroma planes are subsampled in the Y direction,
* this will always be divisible by two.
* \param _yfrag_end The Y coordinate of the first row of 8x8 fragments past
* the newly decoded section.
* If the chroma planes are subsampled in the Y direction,
* this will always be divisible by two.
* I.e., this section contains fragment rows
* <tt>\a _yfrag0 ...\a _yfrag_end -1</tt>.*/
typedef void (*th_stripe_decoded_func)(void *_ctx,th_ycbcr_buffer _buf,
int _yfrag0,int _yfrag_end);
/**The striped decode callback data to pass to #TH_DECCTL_SET_STRIPE_CB.*/
typedef struct{
/**An application-provided context pointer.
* This will be passed back verbatim to the application.*/
void *ctx;
/**The callback function pointer.*/
th_stripe_decoded_func stripe_decoded;
}th_stripe_callback;
/**\name Decoder state
The following data structures are opaque, and their contents are not
publicly defined by this API.
Referring to their internals directly is unsupported, and may break without
warning.*/
/*@{*/
/**The decoder context.*/
typedef struct th_dec_ctx th_dec_ctx;
/**Setup information.
This contains auxiliary information (Huffman tables and quantization
parameters) decoded from the setup header by th_decode_headerin() to be
passed to th_decode_alloc().
It can be re-used to initialize any number of decoders, and can be freed
via th_setup_free() at any time.*/
typedef struct th_setup_info th_setup_info;
/*@}*/
/**\defgroup decfuncs Functions for Decoding*/
/*@{*/
/**\name Functions for decoding
* You must link to <tt>libtheoradec</tt> if you use any of the
* functions in this section.
*
* The functions are listed in the order they are used in a typical decode.
* The basic steps are:
* - Parse the header packets by repeatedly calling th_decode_headerin().
* - Allocate a #th_dec_ctx handle with th_decode_alloc().
* - Call th_setup_free() to free any memory used for codec setup
* information.
* - Perform any additional decoder configuration with th_decode_ctl().
* - For each video data packet:
* - Submit the packet to the decoder via th_decode_packetin().
* - Retrieve the uncompressed video data via th_decode_ycbcr_out().
* - Call th_decode_free() to release all decoder memory.*/
/*@{*/
/**Decodes the header packets of a Theora stream.
* This should be called on the initial packets of the stream, in succession,
* until it returns <tt>0</tt>, indicating that all headers have been
* processed, or an error is encountered.
* At least three header packets are required, and additional optional header
* packets may follow.
* This can be used on the first packet of any logical stream to determine if
* that stream is a Theora stream.
* \param _info A #th_info structure to fill in.
* This must have been previously initialized with
* th_info_init().
* The application may immediately begin using the contents of
* this structure after the first header is decoded, though it
* must continue to be passed in on all subsequent calls.
* \param _tc A #th_comment structure to fill in.
* The application may immediately begin using the contents of
* this structure after the second header is decoded, though it
* must continue to be passed in on all subsequent calls.
* \param _setup Returns a pointer to additional, private setup information
* needed by the decoder.
* The contents of this pointer must be initialized to
* <tt>NULL</tt> on the first call, and the returned value must
* continue to be passed in on all subsequent calls.
* \param _op An <tt>ogg_packet</tt> structure which contains one of the
* initial packets of an Ogg logical stream.
* \return A positive value indicates that a Theora header was successfully
* processed.
* \retval 0 The first video data packet was encountered after all
* required header packets were parsed.
* The packet just passed in on this call should be saved
* and fed to th_decode_packetin() to begin decoding
* video data.
* \retval TH_EFAULT One of \a _info, \a _tc, or \a _setup was
* <tt>NULL</tt>.
* \retval TH_EBADHEADER \a _op was <tt>NULL</tt>, the packet was not the next
* header packet in the expected sequence, or the format
* of the header data was invalid.
* \retval TH_EVERSION The packet data was a Theora info header, but for a
* bitstream version not decodable with this version of
* <tt>libtheoradec</tt>.
* \retval TH_ENOTFORMAT The packet was not a Theora header.
*/
extern int th_decode_headerin(th_info *_info,th_comment *_tc,
th_setup_info **_setup,ogg_packet *_op);
/**Allocates a decoder instance.
*
* <b>Security Warning:</b> The Theora format supports very large frame sizes,
* potentially even larger than the address space of a 32-bit machine, and
* creating a decoder context allocates the space for several frames of data.
* If the allocation fails here, your program will crash, possibly at some
* future point because the OS kernel returned a valid memory range and will
* only fail when it tries to map the pages in it the first time they are
* used.
* Even if it succeeds, you may experience a denial of service if the frame
* size is large enough to cause excessive paging.
* If you are integrating libtheora in a larger application where such things
* are undesirable, it is highly recommended that you check the frame size in
* \a _info before calling this function and refuse to decode streams where it
* is larger than some reasonable maximum.
* libtheora will not check this for you, because there may be machines that
* can handle such streams and applications that wish to.
* \param _info A #th_info struct filled via th_decode_headerin().
* \param _setup A #th_setup_info handle returned via
* th_decode_headerin().
* \return The initialized #th_dec_ctx handle.
* \retval NULL If the decoding parameters were invalid.*/
extern th_dec_ctx *th_decode_alloc(const th_info *_info,
const th_setup_info *_setup);
/**Releases all storage used for the decoder setup information.
* This should be called after you no longer want to create any decoders for
* a stream whose headers you have parsed with th_decode_headerin().
* \param _setup The setup information to free.
* This can safely be <tt>NULL</tt>.*/
extern void th_setup_free(th_setup_info *_setup);
/**Decoder control function.
* This is used to provide advanced control of the decoding process.
* \param _dec A #th_dec_ctx handle.
* \param _req The control code to process.
* See \ref decctlcodes "the list of available control codes"
* for details.
* \param _buf The parameters for this control code.
* \param _buf_sz The size of the parameter buffer.*/
extern int th_decode_ctl(th_dec_ctx *_dec,int _req,void *_buf,
size_t _buf_sz);
/**Submits a packet containing encoded video data to the decoder.
* \param _dec A #th_dec_ctx handle.
* \param _op An <tt>ogg_packet</tt> containing encoded video data.
* \param _granpos Returns the granule position of the decoded packet.
* If non-<tt>NULL</tt>, the granule position for this specific
* packet is stored in this location.
* This is computed incrementally from previously decoded
* packets.
* After a seek, the correct granule position must be set via
* #TH_DECCTL_SET_GRANPOS for this to work properly.
* \retval 0 Success.
* A new decoded frame can be retrieved by calling
* th_decode_ycbcr_out().
* \retval TH_DUPFRAME The packet represented a dropped (0-byte) frame.
* The player can skip the call to th_decode_ycbcr_out(),
* as the contents of the decoded frame buffer have not
* changed.
* \retval TH_EFAULT \a _dec or \a _op was <tt>NULL</tt>.
* \retval TH_EBADPACKET \a _op does not contain encoded video data.
* \retval TH_EIMPL The video data uses bitstream features which this
* library does not support.*/
extern int th_decode_packetin(th_dec_ctx *_dec,const ogg_packet *_op,
ogg_int64_t *_granpos);
/**Outputs the next available frame of decoded Y'CbCr data.
* If a striped decode callback has been set with #TH_DECCTL_SET_STRIPE_CB,
* then the application does not need to call this function.
* \param _dec A #th_dec_ctx handle.
* \param _ycbcr A video buffer structure to fill in.
* <tt>libtheoradec</tt> will fill in all the members of this
* structure, including the pointers to the uncompressed video
* data.
* The memory for this video data is owned by
* <tt>libtheoradec</tt>.
* It may be freed or overwritten without notification when
* subsequent frames are decoded.
* \retval 0 Success
* \retval TH_EFAULT \a _dec or \a _ycbcr was <tt>NULL</tt>.
*/
extern int th_decode_ycbcr_out(th_dec_ctx *_dec,
th_ycbcr_buffer _ycbcr);
/**Frees an allocated decoder instance.
* \param _dec A #th_dec_ctx handle.*/
extern void th_decode_free(th_dec_ctx *_dec);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\file
* The <tt>libtheoraenc</tt> C encoding API.*/
#if !defined(_O_THEORA_THEORAENC_H_)
# define _O_THEORA_THEORAENC_H_ (1)
# include <stddef.h>
# include <ogg/ogg.h>
# include "codec.h"
#if defined(__cplusplus)
extern "C" {
#endif
/**\name th_encode_ctl() codes
* \anchor encctlcodes
* These are the available request codes for th_encode_ctl().
* By convention, these are even, to distinguish them from the
* \ref decctlcodes "decoder control codes".
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Sets the Huffman tables to use.
* The tables are copied, not stored by reference, so they can be freed after
* this call.
* <tt>NULL</tt> may be specified to revert to the default tables.
*
* \param[in] _buf <tt>#th_huff_code[#TH_NHUFFMAN_TABLES][#TH_NDCT_TOKENS]</tt>
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL Encoding has already begun or one or more of the given
* tables is not full or prefix-free, \a _buf is
* <tt>NULL</tt> and \a _buf_sz is not zero, or \a _buf is
* non-<tt>NULL</tt> and \a _buf_sz is not
* <tt>sizeof(#th_huff_code)*#TH_NHUFFMAN_TABLES*#TH_NDCT_TOKENS</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_HUFFMAN_CODES (0)
/**Sets the quantization parameters to use.
* The parameters are copied, not stored by reference, so they can be freed
* after this call.
* <tt>NULL</tt> may be specified to revert to the default parameters.
*
* \param[in] _buf #th_quant_info
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL Encoding has already begun, \a _buf is
* <tt>NULL</tt> and \a _buf_sz is not zero,
* or \a _buf is non-<tt>NULL</tt> and
* \a _buf_sz is not <tt>sizeof(#th_quant_info)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUANT_PARAMS (2)
/**Sets the maximum distance between key frames.
* This can be changed during an encode, but will be bounded by
* <tt>1<<th_info#keyframe_granule_shift</tt>.
* If it is set before encoding begins, th_info#keyframe_granule_shift will
* be enlarged appropriately.
*
* \param[in] _buf <tt>ogg_uint32_t</tt>: The maximum distance between key
* frames.
* \param[out] _buf <tt>ogg_uint32_t</tt>: The actual maximum distance set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(ogg_uint32_t)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE (4)
/**Disables any encoder features that would prevent lossless transcoding back
* to VP3.
* This primarily means disabling block-adaptive quantization and always coding
* all four luma blocks in a macro block when 4MV is used.
* It also includes using the VP3 quantization tables and Huffman codes; if you
* set them explicitly after calling this function, the resulting stream will
* not be VP3-compatible.
* If you enable VP3-compatibility when encoding 4:2:2 or 4:4:4 source
* material, or when using a picture region smaller than the full frame (e.g.
* a non-multiple-of-16 width or height), then non-VP3 bitstream features will
* still be disabled, but the stream will still not be VP3-compatible, as VP3
* was not capable of encoding such formats.
* If you call this after encoding has already begun, then the quantization
* tables and codebooks cannot be changed, but the frame-level features will
* be enabled or disabled as requested.
*
* \param[in] _buf <tt>int</tt>: a non-zero value to enable VP3 compatibility,
* or 0 to disable it (the default).
* \param[out] _buf <tt>int</tt>: 1 if all bitstream features required for
* VP3-compatibility could be set, and 0 otherwise.
* The latter will be returned if the pixel format is not
* 4:2:0, the picture region is smaller than the full frame,
* or if encoding has begun, preventing the quantization
* tables and codebooks from being set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_VP3_COMPATIBLE (10)
/**Gets the maximum speed level.
* Higher speed levels favor quicker encoding over better quality per bit.
* Depending on the encoding mode, and the internal algorithms used, quality
* may actually improve, but in this case bitrate will also likely increase.
* In any case, overall rate/distortion performance will probably decrease.
* The maximum value, and the meaning of each value, may change depending on
* the current encoding mode (VBR vs. constant quality, etc.).
*
* \param[out] _buf <tt>int</tt>: The maximum encoding speed level.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL_MAX (12)
/**Sets the speed level.
* The current speed level may be retrieved using #TH_ENCCTL_GET_SPLEVEL.
*
* \param[in] _buf <tt>int</tt>: The new encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* encoding speed level is out of bounds.
* The maximum encoding speed level may be
* implementation- and encoding mode-specific, and can be
* obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_SPLEVEL (14)
/**Gets the current speed level.
* The default speed level may vary according to encoder implementation, but if
* this control code is not supported (it returns #TH_EIMPL), the default may
* be assumed to be the slowest available speed (0).
* The maximum encoding speed level may be implementation- and encoding
* mode-specific, and can be obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
*
* \param[out] _buf <tt>int</tt>: The current encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL (16)
/**Sets the number of duplicates of the next frame to produce.
* Although libtheora can encode duplicate frames very cheaply, it costs some
* amount of CPU to detect them, and a run of duplicates cannot span a
* keyframe boundary.
* This control code tells the encoder to produce the specified number of extra
* duplicates of the next frame.
* This allows the encoder to make smarter keyframe placement decisions and
* rate control decisions, and reduces CPU usage as well, when compared to
* just submitting the same frame for encoding multiple times.
* This setting only applies to the next frame submitted for encoding.
* You MUST call th_encode_packetout() repeatedly until it returns 0, or the
* extra duplicate frames will be lost.
*
* \param[in] _buf <tt>int</tt>: The number of duplicates to produce.
* If this is negative or zero, no duplicates will be produced.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* number of duplicates is greater than or equal to the
* maximum keyframe interval.
* In the latter case, NO duplicate frames will be produced.
* You must ensure that the maximum keyframe interval is set
* larger than the maximum number of duplicates you will
* ever wish to insert prior to encoding.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_DUP_COUNT (18)
/**Modifies the default bitrate management behavior.
* Use to allow or disallow frame dropping, and to enable or disable capping
* bit reservoir overflows and underflows.
* See \ref encctlcodes "the list of available flags".
* The flags are set by default to
* <tt>#TH_RATECTL_DROP_FRAMES|#TH_RATECTL_CAP_OVERFLOW</tt>.
*
* \param[in] _buf <tt>int</tt>: Any combination of
* \ref ratectlflags "the available flags":
* - #TH_RATECTL_DROP_FRAMES: Enable frame dropping.
* - #TH_RATECTL_CAP_OVERFLOW: Don't bank excess bits for later
* use.
* - #TH_RATECTL_CAP_UNDERFLOW: Don't try to make up shortfalls
* later.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt> or rate control
* is not enabled.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_RATE_FLAGS (20)
/**Sets the size of the bitrate management bit reservoir as a function
* of number of frames.
* The reservoir size affects how quickly bitrate management reacts to
* instantaneous changes in the video complexity.
* Larger reservoirs react more slowly, and provide better overall quality, but
* require more buffering by a client, adding more latency to live streams.
* By default, libtheora sets the reservoir to the maximum distance between
* keyframes, subject to a minimum and maximum limit.
* This call may be used to increase or decrease the reservoir, increasing or
* decreasing the allowed temporary variance in bitrate.
* An implementation may impose some limits on the size of a reservoir it can
* handle, in which case the actual reservoir size may not be exactly what was
* requested.
* The actual value set will be returned.
*
* \param[in] _buf <tt>int</tt>: Requested size of the reservoir measured in
* frames.
* \param[out] _buf <tt>int</tt>: The actual size of the reservoir set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or rate control
* is not enabled. The buffer has an implementation
* defined minimum and maximum size and the value in _buf
* will be adjusted to match the actual value set.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_RATE_BUFFER (22)
/**Enable pass 1 of two-pass encoding mode and retrieve the first pass metrics.
* Pass 1 mode must be enabled before the first frame is encoded, and a target
* bitrate must have already been specified to the encoder.
* Although this does not have to be the exact rate that will be used in the
* second pass, closer values may produce better results.
* The first call returns the size of the two-pass header data, along with some
* placeholder content, and sets the encoder into pass 1 mode implicitly.
* This call sets the encoder to pass 1 mode implicitly.
* Then, a subsequent call must be made after each call to
* th_encode_ycbcr_in() to retrieve the metrics for that frame.
* An additional, final call must be made to retrieve the summary data,
* containing such information as the total number of frames, etc.
* This must be stored in place of the placeholder data that was returned
* in the first call, before the frame metrics data.
* All of this data must be presented back to the encoder during pass 2 using
* #TH_ENCCTL_2PASS_IN.
*
* \param[out] <tt>char *</tt>_buf: Returns a pointer to internal storage
* containing the two pass metrics data.
* This storage is only valid until the next call, or until the
* encoder context is freed, and must be copied by the
* application.
* \retval >=0 The number of bytes of metric data available in the
* returned buffer.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(char *)</tt>, no target
* bitrate has been set, or the first call was made after
* the first frame was submitted for encoding.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_2PASS_OUT (24)
/**Submits two-pass encoding metric data collected the first encoding pass to
* the second pass.
* The first call must be made before the first frame is encoded, and a target
* bitrate must have already been specified to the encoder.
* It sets the encoder to pass 2 mode implicitly; this cannot be disabled.
* The encoder may require reading data from some or all of the frames in
* advance, depending on, e.g., the reservoir size used in the second pass.
* You must call this function repeatedly before each frame to provide data
* until either a) it fails to consume all of the data presented or b) all of
* the pass 1 data has been consumed.
* In the first case, you must save the remaining data to be presented after
* the next frame.
* You can call this function with a NULL argument to get an upper bound on
* the number of bytes that will be required before the next frame.
*
* When pass 2 is first enabled, the default bit reservoir is set to the entire
* file; this gives maximum flexibility but can lead to very high peak rates.
* You can subsequently set it to another value with #TH_ENCCTL_SET_RATE_BUFFER
* (e.g., to set it to the keyframe interval for non-live streaming), however,
* you may then need to provide more data before the next frame.
*
* \param[in] _buf <tt>char[]</tt>: A buffer containing the data returned by
* #TH_ENCCTL_2PASS_OUT in pass 1.
* You may pass <tt>NULL</tt> for \a _buf to return an upper
* bound on the number of additional bytes needed before the
* next frame.
* The summary data returned at the end of pass 1 must be at
* the head of the buffer on the first call with a
* non-<tt>NULL</tt> \a _buf, and the placeholder data
* returned at the start of pass 1 should be omitted.
* After each call you should advance this buffer by the number
* of bytes consumed.
* \retval >0 The number of bytes of metric data required/consumed.
* \retval 0 No more data is required before the next frame.
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL No target bitrate has been set, or the first call was
* made after the first frame was submitted for
* encoding.
* \retval TH_ENOTFORMAT The data did not appear to be pass 1 from a compatible
* implementation of this library.
* \retval TH_EBADHEADER The data was invalid; this may be returned when
* attempting to read an aborted pass 1 file that still
* has the placeholder data in place of the summary
* data.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_2PASS_IN (26)
/**Sets the current encoding quality.
* This is only valid so long as no bitrate has been specified, either through
* the #th_info struct used to initialize the encoder or through
* #TH_ENCCTL_SET_BITRATE (this restriction may be relaxed in a future
* version).
* If it is set before the headers are emitted, the target quality encoded in
* them will be updated.
*
* \param[in] _buf <tt>int</tt>: The new target quality, in the range 0...63,
* inclusive.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL A target bitrate has already been specified, or the
* quality index was not in the range 0...63.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUALITY (28)
/**Sets the current encoding bitrate.
* Once a bitrate is set, the encoder must use a rate-controlled mode for all
* future frames (this restriction may be relaxed in a future version).
* If it is set before the headers are emitted, the target bitrate encoded in
* them will be updated.
* Due to the buffer delay, the exact bitrate of each section of the encode is
* not guaranteed.
* The encoder may have already used more bits than allowed for the frames it
* has encoded, expecting to make them up in future frames, or it may have
* used fewer, holding the excess in reserve.
* The exact transition between the two bitrates is not well-defined by this
* API, but may be affected by flags set with #TH_ENCCTL_SET_RATE_FLAGS.
* After a number of frames equal to the buffer delay, one may expect further
* output to average at the target bitrate.
*
* \param[in] _buf <tt>long</tt>: The new target bitrate, in bits per second.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL The target bitrate was not positive.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_BITRATE (30)
/*@}*/
/**\name TH_ENCCTL_SET_RATE_FLAGS flags
* \anchor ratectlflags
* These are the flags available for use with #TH_ENCCTL_SET_RATE_FLAGS.*/
/*@{*/
/**Drop frames to keep within bitrate buffer constraints.
* This can have a severe impact on quality, but is the only way to ensure that
* bitrate targets are met at low rates during sudden bursts of activity.*/
#define TH_RATECTL_DROP_FRAMES (0x1)
/**Ignore bitrate buffer overflows.
* If the encoder uses so few bits that the reservoir of available bits
* overflows, ignore the excess.
* The encoder will not try to use these extra bits in future frames.
* At high rates this may cause the result to be undersized, but allows a
* client to play the stream using a finite buffer; it should normally be
* enabled.*/
#define TH_RATECTL_CAP_OVERFLOW (0x2)
/**Ignore bitrate buffer underflows.
* If the encoder uses so many bits that the reservoir of available bits
* underflows, ignore the deficit.
* The encoder will not try to make up these extra bits in future frames.
* At low rates this may cause the result to be oversized; it should normally
* be disabled.*/
#define TH_RATECTL_CAP_UNDERFLOW (0x4)
/*@}*/
/**The quantization parameters used by VP3.*/
extern const th_quant_info TH_VP31_QUANT_INFO;
/**The Huffman tables used by VP3.*/
extern const th_huff_code
TH_VP31_HUFF_CODES[TH_NHUFFMAN_TABLES][TH_NDCT_TOKENS];
/**\name Encoder state
The following data structure is opaque, and its contents are not publicly
defined by this API.
Referring to its internals directly is unsupported, and may break without
warning.*/
/*@{*/
/**The encoder context.*/
typedef struct th_enc_ctx th_enc_ctx;
/*@}*/
/**\defgroup encfuncs Functions for Encoding*/
/*@{*/
/**\name Functions for encoding
* You must link to <tt>libtheoraenc</tt> and <tt>libtheoradec</tt>
* if you use any of the functions in this section.
*
* The functions are listed in the order they are used in a typical encode.
* The basic steps are:
* - Fill in a #th_info structure with details on the format of the video you
* wish to encode.
* - Allocate a #th_enc_ctx handle with th_encode_alloc().
* - Perform any additional encoder configuration required with
* th_encode_ctl().
* - Repeatedly call th_encode_flushheader() to retrieve all the header
* packets.
* - For each uncompressed frame:
* - Submit the uncompressed frame via th_encode_ycbcr_in()
* - Repeatedly call th_encode_packetout() to retrieve any video data packets
* that are ready.
* - Call th_encode_free() to release all encoder memory.*/
/*@{*/
/**Allocates an encoder instance.
* \param _info A #th_info struct filled with the desired encoding parameters.
* \return The initialized #th_enc_ctx handle.
* \retval NULL If the encoding parameters were invalid.*/
extern th_enc_ctx *th_encode_alloc(const th_info *_info);
/**Encoder control function.
* This is used to provide advanced control the encoding process.
* \param _enc A #th_enc_ctx handle.
* \param _req The control code to process.
* See \ref encctlcodes "the list of available control codes"
* for details.
* \param _buf The parameters for this control code.
* \param _buf_sz The size of the parameter buffer.*/
extern int th_encode_ctl(th_enc_ctx *_enc,int _req,void *_buf,size_t _buf_sz);
/**Outputs the next header packet.
* This should be called repeatedly after encoder initialization until it
* returns 0 in order to get all of the header packets, in order, before
* encoding actual video data.
* \param _enc A #th_enc_ctx handle.
* \param _comments The metadata to place in the comment header, when it is
* encoded.
* \param _op An <tt>ogg_packet</tt> structure to fill.
* All of the elements of this structure will be set,
* including a pointer to the header data.
* The memory for the header data is owned by
* <tt>libtheoraenc</tt>, and may be invalidated when the
* next encoder function is called.
* \return A positive value indicates that a header packet was successfully
* produced.
* \retval 0 No packet was produced, and no more header packets remain.
* \retval TH_EFAULT \a _enc, \a _comments, or \a _op was <tt>NULL</tt>.*/
extern int th_encode_flushheader(th_enc_ctx *_enc,
th_comment *_comments,ogg_packet *_op);
/**Submits an uncompressed frame to the encoder.
* \param _enc A #th_enc_ctx handle.
* \param _ycbcr A buffer of Y'CbCr data to encode.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc or \a _ycbcr is <tt>NULL</tt>.
* \retval TH_EINVAL The buffer size does not match the frame size the encoder
* was initialized with, or encoding has already
* completed.*/
extern int th_encode_ycbcr_in(th_enc_ctx *_enc,th_ycbcr_buffer _ycbcr);
/**Retrieves encoded video data packets.
* This should be called repeatedly after each frame is submitted to flush any
* encoded packets, until it returns 0.
* The encoder will not buffer these packets as subsequent frames are
* compressed, so a failure to do so will result in lost video data.
* \note Currently the encoder operates in a one-frame-in, one-packet-out
* manner.
* However, this may be changed in the future.
* \param _enc A #th_enc_ctx handle.
* \param _last Set this flag to a non-zero value if no more uncompressed
* frames will be submitted.
* This ensures that a proper EOS flag is set on the last packet.
* \param _op An <tt>ogg_packet</tt> structure to fill.
* All of the elements of this structure will be set, including a
* pointer to the video data.
* The memory for the video data is owned by
* <tt>libtheoraenc</tt>, and may be invalidated when the next
* encoder function is called.
* \return A positive value indicates that a video data packet was successfully
* produced.
* \retval 0 No packet was produced, and no more encoded video data
* remains.
* \retval TH_EFAULT \a _enc or \a _op was <tt>NULL</tt>.*/
extern int th_encode_packetout(th_enc_ctx *_enc,int _last,ogg_packet *_op);
/**Frees an allocated encoder instance.
* \param _enc A #th_enc_ctx handle.*/
extern void th_encode_free(th_enc_ctx *_enc);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>BuildMachineOSBuild</key>
<string>15B42</string>
<key>CFBundleDevelopmentRegion</key>
<string>English</string>
<key>CFBundleExecutable</key>
<string>Theora</string>
<key>CFBundleGetInfoString</key>
<string>Theora framework 1.1alpha1svn, Copyright © 2002-2009Xiph.Org Foundation</string>
<key>CFBundleIdentifier</key>
<string>org.xiph.theora</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundlePackageType</key>
<string>FMWK</string>
<key>CFBundleShortVersionString</key>
<string>1.1alpha1svn</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleSupportedPlatforms</key>
<array>
<string>MacOSX</string>
</array>
<key>CFBundleVersion</key>
<string>1.0d6</string>
<key>CSResourcesFileMapped</key>
<true/>
<key>DTCompiler</key>
<string>com.apple.compilers.llvm.clang.1_0</string>
<key>DTPlatformBuild</key>
<string>7C68</string>
<key>DTPlatformVersion</key>
<string>GM</string>
<key>DTSDKBuild</key>
<string>15C43</string>
<key>DTSDKName</key>
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<key>DTXcode</key>
<string>0720</string>
<key>DTXcodeBuild</key>
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<key>NSHumanReadableCopyright</key>
<string>Theora framework 1.1alpha1svn, Copyright © 2002-2009Xiph.Org Foundation</string>
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</plist>

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\mainpage
*
* \section intro Introduction
*
* This is the documentation for <tt>libtheora</tt> C API.
* The current reference
* implementation for <a href="http://www.theora.org/">Theora</a>, a free,
* patent-unencumbered video codec.
* Theora is derived from On2's VP3 codec with additional features and
* integration with Ogg multimedia formats by
* <a href="http://www.xiph.org/">the Xiph.Org Foundation</a>.
* Complete documentation of the format itself is available in
* <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>.
*
* \subsection Organization
*
* The functions documented here are actually subdivided into three
* separate libraries:
* - <tt>libtheoraenc</tt> contains the encoder interface,
* described in \ref encfuncs.
* - <tt>libtheoradec</tt> contains the decoder interface and
* routines shared with the encoder.
* You must also link to this if you link to <tt>libtheoraenc</tt>.
* The routines in this library are described in \ref decfuncs and
* \ref basefuncs.
* - <tt>libtheora</tt> contains the \ref oldfuncs.
*
* New code should link to <tt>libtheoradec</tt> and, if using encoder
* features, <tt>libtheoraenc</tt>. Together these two export both
* the standard and the legacy API, so this is all that is needed by
* any code. The older <tt>libtheora</tt> library is provided just for
* compatibility with older build configurations.
*
* In general the recommended 1.x API symbols can be distinguished
* by their <tt>th_</tt> or <tt>TH_</tt> namespace prefix.
* The older, legacy API uses <tt>theora_</tt> or <tt>OC_</tt>
* prefixes instead.
*/
/**\file
* The shared <tt>libtheoradec</tt> and <tt>libtheoraenc</tt> C API.
* You don't need to include this directly.*/
#if !defined(_O_THEORA_CODEC_H_)
# define _O_THEORA_CODEC_H_ (1)
# include <ogg/ogg.h>
#if defined(__cplusplus)
extern "C" {
#endif
/**\name Return codes*/
/*@{*/
/**An invalid pointer was provided.*/
#define TH_EFAULT (-1)
/**An invalid argument was provided.*/
#define TH_EINVAL (-10)
/**The contents of the header were incomplete, invalid, or unexpected.*/
#define TH_EBADHEADER (-20)
/**The header does not belong to a Theora stream.*/
#define TH_ENOTFORMAT (-21)
/**The bitstream version is too high.*/
#define TH_EVERSION (-22)
/**The specified function is not implemented.*/
#define TH_EIMPL (-23)
/**There were errors in the video data packet.*/
#define TH_EBADPACKET (-24)
/**The decoded packet represented a dropped frame.
The player can continue to display the current frame, as the contents of the
decoded frame buffer have not changed.*/
#define TH_DUPFRAME (1)
/*@}*/
/**The currently defined color space tags.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Chapter 4, for exact details on the meaning
* of each of these color spaces.*/
typedef enum{
/**The color space was not specified at the encoder.
It may be conveyed by an external means.*/
TH_CS_UNSPECIFIED,
/**A color space designed for NTSC content.*/
TH_CS_ITU_REC_470M,
/**A color space designed for PAL/SECAM content.*/
TH_CS_ITU_REC_470BG,
/**The total number of currently defined color spaces.*/
TH_CS_NSPACES
}th_colorspace;
/**The currently defined pixel format tags.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 4.4, for details on the precise sample
* locations.*/
typedef enum{
/**Chroma decimation by 2 in both the X and Y directions (4:2:0).
The Cb and Cr chroma planes are half the width and half the
height of the luma plane.*/
TH_PF_420,
/**Currently reserved.*/
TH_PF_RSVD,
/**Chroma decimation by 2 in the X direction (4:2:2).
The Cb and Cr chroma planes are half the width of the luma plane, but full
height.*/
TH_PF_422,
/**No chroma decimation (4:4:4).
The Cb and Cr chroma planes are full width and full height.*/
TH_PF_444,
/**The total number of currently defined pixel formats.*/
TH_PF_NFORMATS
}th_pixel_fmt;
/**A buffer for a single color plane in an uncompressed image.
* This contains the image data in a left-to-right, top-down format.
* Each row of pixels is stored contiguously in memory, but successive
* rows need not be.
* Use \a stride to compute the offset of the next row.
* The encoder accepts both positive \a stride values (top-down in memory)
* and negative (bottom-up in memory).
* The decoder currently always generates images with positive strides.*/
typedef struct{
/**The width of this plane.*/
int width;
/**The height of this plane.*/
int height;
/**The offset in bytes between successive rows.*/
int stride;
/**A pointer to the beginning of the first row.*/
unsigned char *data;
}th_img_plane;
/**A complete image buffer for an uncompressed frame.
* The chroma planes may be decimated by a factor of two in either
* direction, as indicated by th_info#pixel_fmt.
* The width and height of the Y' plane must be multiples of 16.
* They may need to be cropped for display, using the rectangle
* specified by th_info#pic_x, th_info#pic_y, th_info#pic_width,
* and th_info#pic_height.
* All samples are 8 bits.
* \note The term YUV often used to describe a colorspace is ambiguous.
* The exact parameters of the RGB to YUV conversion process aside, in
* many contexts the U and V channels actually have opposite meanings.
* To avoid this confusion, we are explicit: the name of the color
* channels are Y'CbCr, and they appear in that order, always.
* The prime symbol denotes that the Y channel is non-linear.
* Cb and Cr stand for "Chroma blue" and "Chroma red", respectively.*/
typedef th_img_plane th_ycbcr_buffer[3];
/**Theora bitstream information.
* This contains the basic playback parameters for a stream, and corresponds to
* the initial 'info' header packet.
* To initialize an encoder, the application fills in this structure and
* passes it to th_encode_alloc().
* A default encoding mode is chosen based on the values of the #quality and
* #target_bitrate fields.
* On decode, it is filled in by th_decode_headerin(), and then passed to
* th_decode_alloc().
*
* Encoded Theora frames must be a multiple of 16 in size;
* this is what the #frame_width and #frame_height members represent.
* To handle arbitrary picture sizes, a crop rectangle is specified in the
* #pic_x, #pic_y, #pic_width and #pic_height members.
*
* All frame buffers contain pointers to the full, padded frame.
* However, the current encoder <em>will not</em> reference pixels outside of
* the cropped picture region, and the application does not need to fill them
* in.
* The decoder <em>will</em> allocate storage for a full frame, but the
* application <em>should not</em> rely on the padding containing sensible
* data.
*
* It is also generally recommended that the offsets and sizes should still be
* multiples of 2 to avoid chroma sampling shifts when chroma is sub-sampled.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 4.4, for more details.
*
* Frame rate, in frames per second, is stored as a rational fraction, as is
* the pixel aspect ratio.
* Note that this refers to the aspect ratio of the individual pixels, not of
* the overall frame itself.
* The frame aspect ratio can be computed from pixel aspect ratio using the
* image dimensions.*/
typedef struct{
/**\name Theora version
* Bitstream version information.*/
/*@{*/
unsigned char version_major;
unsigned char version_minor;
unsigned char version_subminor;
/*@}*/
/**The encoded frame width.
* This must be a multiple of 16, and less than 1048576.*/
ogg_uint32_t frame_width;
/**The encoded frame height.
* This must be a multiple of 16, and less than 1048576.*/
ogg_uint32_t frame_height;
/**The displayed picture width.
* This must be no larger than width.*/
ogg_uint32_t pic_width;
/**The displayed picture height.
* This must be no larger than height.*/
ogg_uint32_t pic_height;
/**The X offset of the displayed picture.
* This must be no larger than #frame_width-#pic_width or 255, whichever is
* smaller.*/
ogg_uint32_t pic_x;
/**The Y offset of the displayed picture.
* This must be no larger than #frame_height-#pic_height, and
* #frame_height-#pic_height-#pic_y must be no larger than 255.
* This slightly funny restriction is due to the fact that the offset is
* specified from the top of the image for consistency with the standard
* graphics left-handed coordinate system used throughout this API, while
* it is stored in the encoded stream as an offset from the bottom.*/
ogg_uint32_t pic_y;
/**\name Frame rate
* The frame rate, as a fraction.
* If either is 0, the frame rate is undefined.*/
/*@{*/
ogg_uint32_t fps_numerator;
ogg_uint32_t fps_denominator;
/*@}*/
/**\name Aspect ratio
* The aspect ratio of the pixels.
* If either value is zero, the aspect ratio is undefined.
* If not specified by any external means, 1:1 should be assumed.
* The aspect ratio of the full picture can be computed as
* \code
* aspect_numerator*pic_width/(aspect_denominator*pic_height).
* \endcode */
/*@{*/
ogg_uint32_t aspect_numerator;
ogg_uint32_t aspect_denominator;
/*@}*/
/**The color space.*/
th_colorspace colorspace;
/**The pixel format.*/
th_pixel_fmt pixel_fmt;
/**The target bit-rate in bits per second.
If initializing an encoder with this struct, set this field to a non-zero
value to activate CBR encoding by default.*/
int target_bitrate;
/**The target quality level.
Valid values range from 0 to 63, inclusive, with higher values giving
higher quality.
If initializing an encoder with this struct, and #target_bitrate is set
to zero, VBR encoding at this quality will be activated by default.*/
/*Currently this is set so that a qi of 0 corresponds to distortions of 24
times the JND, and each increase by 16 halves that value.
This gives us fine discrimination at low qualities, yet effective rate
control at high qualities.
The qi value 63 is special, however.
For this, the highest quality, we use one half of a JND for our threshold.
Due to the lower bounds placed on allowable quantizers in Theora, we will
not actually be able to achieve quality this good, but this should
provide as close to visually lossless quality as Theora is capable of.
We could lift the quantizer restrictions without breaking VP3.1
compatibility, but this would result in quantized coefficients that are
too large for the current bitstream to be able to store.
We'd have to redesign the token syntax to store these large coefficients,
which would make transcoding complex.*/
int quality;
/**The amount to shift to extract the last keyframe number from the granule
* position.
* This can be at most 31.
* th_info_init() will set this to a default value (currently <tt>6</tt>,
* which is good for streaming applications), but you can set it to 0 to
* make every frame a keyframe.
* The maximum distance between key frames is
* <tt>1<<#keyframe_granule_shift</tt>.
* The keyframe frequency can be more finely controlled with
* #TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE, which can also be adjusted
* during encoding (for example, to force the next frame to be a keyframe),
* but it cannot be set larger than the amount permitted by this field after
* the headers have been output.*/
int keyframe_granule_shift;
}th_info;
/**The comment information.
*
* This structure holds the in-stream metadata corresponding to
* the 'comment' header packet.
* The comment header is meant to be used much like someone jotting a quick
* note on the label of a video.
* It should be a short, to the point text note that can be more than a couple
* words, but not more than a short paragraph.
*
* The metadata is stored as a series of (tag, value) pairs, in
* length-encoded string vectors.
* The first occurrence of the '=' character delimits the tag and value.
* A particular tag may occur more than once, and order is significant.
* The character set encoding for the strings is always UTF-8, but the tag
* names are limited to ASCII, and treated as case-insensitive.
* See <a href="http://www.theora.org/doc/Theora.pdf">the Theora
* specification</a>, Section 6.3.3 for details.
*
* In filling in this structure, th_decode_headerin() will null-terminate
* the user_comment strings for safety.
* However, the bitstream format itself treats them as 8-bit clean vectors,
* possibly containing null characters, and so the length array should be
* treated as their authoritative length.
*/
typedef struct th_comment{
/**The array of comment string vectors.*/
char **user_comments;
/**An array of the corresponding length of each vector, in bytes.*/
int *comment_lengths;
/**The total number of comment strings.*/
int comments;
/**The null-terminated vendor string.
This identifies the software used to encode the stream.*/
char *vendor;
}th_comment;
/**A single base matrix.*/
typedef unsigned char th_quant_base[64];
/**A set of \a qi ranges.*/
typedef struct{
/**The number of ranges in the set.*/
int nranges;
/**The size of each of the #nranges ranges.
These must sum to 63.*/
const int *sizes;
/**#nranges <tt>+1</tt> base matrices.
Matrices \a i and <tt>i+1</tt> form the endpoints of range \a i.*/
const th_quant_base *base_matrices;
}th_quant_ranges;
/**A complete set of quantization parameters.
The quantizer for each coefficient is calculated as:
\code
Q=MAX(MIN(qmin[qti][ci!=0],scale[ci!=0][qi]*base[qti][pli][qi][ci]/100),
1024).
\endcode
\a qti is the quantization type index: 0 for intra, 1 for inter.
<tt>ci!=0</tt> is 0 for the DC coefficient and 1 for AC coefficients.
\a qi is the quality index, ranging between 0 (low quality) and 63 (high
quality).
\a pli is the color plane index: 0 for Y', 1 for Cb, 2 for Cr.
\a ci is the DCT coefficient index.
Coefficient indices correspond to the normal 2D DCT block
ordering--row-major with low frequencies first--\em not zig-zag order.
Minimum quantizers are constant, and are given by:
\code
qmin[2][2]={{4,2},{8,4}}.
\endcode
Parameters that can be stored in the bitstream are as follows:
- The two scale matrices ac_scale and dc_scale.
\code
scale[2][64]={dc_scale,ac_scale}.
\endcode
- The base matrices for each \a qi, \a qti and \a pli (up to 384 in all).
In order to avoid storing a full 384 base matrices, only a sparse set of
matrices are stored, and the rest are linearly interpolated.
This is done as follows.
For each \a qti and \a pli, a series of \a n \a qi ranges is defined.
The size of each \a qi range can vary arbitrarily, but they must sum to
63.
Then, <tt>n+1</tt> matrices are specified, one for each endpoint of the
ranges.
For interpolation purposes, each range's endpoints are the first \a qi
value it contains and one past the last \a qi value it contains.
Fractional values are rounded to the nearest integer, with ties rounded
away from zero.
Base matrices are stored by reference, so if the same matrices are used
multiple times, they will only appear once in the bitstream.
The bitstream is also capable of omitting an entire set of ranges and
its associated matrices if they are the same as either the previous
set (indexed in row-major order) or if the inter set is the same as the
intra set.
- Loop filter limit values.
The same limits are used for the loop filter in all color planes, despite
potentially differing levels of quantization in each.
For the current encoder, <tt>scale[ci!=0][qi]</tt> must be no greater
than <tt>scale[ci!=0][qi-1]</tt> and <tt>base[qti][pli][qi][ci]</tt> must
be no greater than <tt>base[qti][pli][qi-1][ci]</tt>.
These two conditions ensure that the actual quantizer for a given \a qti,
\a pli, and \a ci does not increase as \a qi increases.
This is not required by the decoder.*/
typedef struct{
/**The DC scaling factors.*/
ogg_uint16_t dc_scale[64];
/**The AC scaling factors.*/
ogg_uint16_t ac_scale[64];
/**The loop filter limit values.*/
unsigned char loop_filter_limits[64];
/**The \a qi ranges for each \a ci and \a pli.*/
th_quant_ranges qi_ranges[2][3];
}th_quant_info;
/**The number of Huffman tables used by Theora.*/
#define TH_NHUFFMAN_TABLES (80)
/**The number of DCT token values in each table.*/
#define TH_NDCT_TOKENS (32)
/**A Huffman code for a Theora DCT token.
* Each set of Huffman codes in a given table must form a complete, prefix-free
* code.
* There is no requirement that all the tokens in a table have a valid code,
* but the current encoder is not optimized to take advantage of this.
* If each of the five grouops of 16 tables does not contain at least one table
* with a code for every token, then the encoder may fail to encode certain
* frames.
* The complete table in the first group of 16 does not have to be in the same
* place as the complete table in the other groups, but the complete tables in
* the remaining four groups must all be in the same place.*/
typedef struct{
/**The bit pattern for the code, with the LSbit of the pattern aligned in
* the LSbit of the word.*/
ogg_uint32_t pattern;
/**The number of bits in the code.
* This must be between 0 and 32, inclusive.*/
int nbits;
}th_huff_code;
/**\defgroup basefuncs Functions Shared by Encode and Decode*/
/*@{*/
/**\name Basic shared functions*/
/*@{*/
/**Retrieves a human-readable string to identify the library vendor and
* version.
* \return the version string.*/
extern const char *th_version_string(void);
/**Retrieves the library version number.
* This is the highest bitstream version that the encoder library will produce,
* or that the decoder library can decode.
* This number is composed of a 16-bit major version, 8-bit minor version
* and 8 bit sub-version, composed as follows:
* \code
* (VERSION_MAJOR<<16)+(VERSION_MINOR<<8)+(VERSION_SUBMINOR)
* \endcode
* \return the version number.*/
extern ogg_uint32_t th_version_number(void);
/**Converts a granule position to an absolute frame index, starting at
* <tt>0</tt>.
* The granule position is interpreted in the context of a given
* #th_enc_ctx or #th_dec_ctx handle (either will suffice).
* \param _encdec A previously allocated #th_enc_ctx or #th_dec_ctx
* handle.
* \param _granpos The granule position to convert.
* \returns The absolute frame index corresponding to \a _granpos.
* \retval -1 The given granule position was invalid (i.e. negative).*/
extern ogg_int64_t th_granule_frame(void *_encdec,ogg_int64_t _granpos);
/**Converts a granule position to an absolute time in seconds.
* The granule position is interpreted in the context of a given
* #th_enc_ctx or #th_dec_ctx handle (either will suffice).
* \param _encdec A previously allocated #th_enc_ctx or #th_dec_ctx
* handle.
* \param _granpos The granule position to convert.
* \return The absolute time in seconds corresponding to \a _granpos.
* This is the "end time" for the frame, or the latest time it should
* be displayed.
* It is not the presentation time.
* \retval -1 The given granule position was invalid (i.e. negative).*/
extern double th_granule_time(void *_encdec,ogg_int64_t _granpos);
/**Determines whether a Theora packet is a header or not.
* This function does no verification beyond checking the packet type bit, so
* it should not be used for bitstream identification; use
* th_decode_headerin() for that.
* As per the Theora specification, an empty (0-byte) packet is treated as a
* data packet (a delta frame with no coded blocks).
* \param _op An <tt>ogg_packet</tt> containing encoded Theora data.
* \retval 1 The packet is a header packet
* \retval 0 The packet is a video data packet.*/
extern int th_packet_isheader(ogg_packet *_op);
/**Determines whether a theora packet is a key frame or not.
* This function does no verification beyond checking the packet type and
* key frame bits, so it should not be used for bitstream identification; use
* th_decode_headerin() for that.
* As per the Theora specification, an empty (0-byte) packet is treated as a
* delta frame (with no coded blocks).
* \param _op An <tt>ogg_packet</tt> containing encoded Theora data.
* \retval 1 The packet contains a key frame.
* \retval 0 The packet contains a delta frame.
* \retval -1 The packet is not a video data packet.*/
extern int th_packet_iskeyframe(ogg_packet *_op);
/*@}*/
/**\name Functions for manipulating header data*/
/*@{*/
/**Initializes a th_info structure.
* This should be called on a freshly allocated #th_info structure before
* attempting to use it.
* \param _info The #th_info struct to initialize.*/
extern void th_info_init(th_info *_info);
/**Clears a #th_info structure.
* This should be called on a #th_info structure after it is no longer
* needed.
* \param _info The #th_info struct to clear.*/
extern void th_info_clear(th_info *_info);
/**Initialize a #th_comment structure.
* This should be called on a freshly allocated #th_comment structure
* before attempting to use it.
* \param _tc The #th_comment struct to initialize.*/
extern void th_comment_init(th_comment *_tc);
/**Add a comment to an initialized #th_comment structure.
* \note Neither th_comment_add() nor th_comment_add_tag() support
* comments containing null values, although the bitstream format does
* support them.
* To add such comments you will need to manipulate the #th_comment
* structure directly.
* \param _tc The #th_comment struct to add the comment to.
* \param _comment Must be a null-terminated UTF-8 string containing the
* comment in "TAG=the value" form.*/
extern void th_comment_add(th_comment *_tc, char *_comment);
/**Add a comment to an initialized #th_comment structure.
* \note Neither th_comment_add() nor th_comment_add_tag() support
* comments containing null values, although the bitstream format does
* support them.
* To add such comments you will need to manipulate the #th_comment
* structure directly.
* \param _tc The #th_comment struct to add the comment to.
* \param _tag A null-terminated string containing the tag associated with
* the comment.
* \param _val The corresponding value as a null-terminated string.*/
extern void th_comment_add_tag(th_comment *_tc,char *_tag,char *_val);
/**Look up a comment value by its tag.
* \param _tc An initialized #th_comment structure.
* \param _tag The tag to look up.
* \param _count The instance of the tag.
* The same tag can appear multiple times, each with a distinct
* value, so an index is required to retrieve them all.
* The order in which these values appear is significant and
* should be preserved.
* Use th_comment_query_count() to get the legal range for
* the \a _count parameter.
* \return A pointer to the queried tag's value.
* This points directly to data in the #th_comment structure.
* It should not be modified or freed by the application, and
* modifications to the structure may invalidate the pointer.
* \retval NULL If no matching tag is found.*/
extern char *th_comment_query(th_comment *_tc,char *_tag,int _count);
/**Look up the number of instances of a tag.
* Call this first when querying for a specific tag and then iterate over the
* number of instances with separate calls to th_comment_query() to
* retrieve all the values for that tag in order.
* \param _tc An initialized #th_comment structure.
* \param _tag The tag to look up.
* \return The number on instances of this particular tag.*/
extern int th_comment_query_count(th_comment *_tc,char *_tag);
/**Clears a #th_comment structure.
* This should be called on a #th_comment structure after it is no longer
* needed.
* It will free all memory used by the structure members.
* \param _tc The #th_comment struct to clear.*/
extern void th_comment_clear(th_comment *_tc);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.17 2003/12/06 18:06:19 arc Exp $
********************************************************************/
#ifndef _O_THEORA_H_
#define _O_THEORA_H_
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
#include <stddef.h> /* for size_t */
#include <ogg/ogg.h>
/** \file
* The libtheora pre-1.0 legacy C API.
*
* \ingroup oldfuncs
*
* \section intro Introduction
*
* This is the documentation for the libtheora legacy C API, declared in
* the theora.h header, which describes the old interface used before
* the 1.0 release. This API was widely deployed for several years and
* remains supported, but for new code we recommend the cleaner API
* declared in theoradec.h and theoraenc.h.
*
* libtheora is the reference implementation for
* <a href="http://www.theora.org/">Theora</a>, a free video codec.
* Theora is derived from On2's VP3 codec with improved integration with
* Ogg multimedia formats by <a href="http://www.xiph.org/">Xiph.Org</a>.
*
* \section overview Overview
*
* This library will both decode and encode theora packets to/from raw YUV
* frames. In either case, the packets will most likely either come from or
* need to be embedded in an Ogg stream. Use
* <a href="http://xiph.org/ogg/">libogg</a> or
* <a href="http://www.annodex.net/software/liboggz/index.html">liboggz</a>
* to extract/package these packets.
*
* \section decoding Decoding Process
*
* Decoding can be separated into the following steps:
* -# initialise theora_info and theora_comment structures using
* theora_info_init() and theora_comment_init():
\verbatim
theora_info info;
theora_comment comment;
theora_info_init(&info);
theora_comment_init(&comment);
\endverbatim
* -# retrieve header packets from Ogg stream (there should be 3) and decode
* into theora_info and theora_comment structures using
* theora_decode_header(). See \ref identification for more information on
* identifying which packets are theora packets.
\verbatim
int i;
for (i = 0; i < 3; i++)
{
(get a theora packet "op" from the Ogg stream)
theora_decode_header(&info, &comment, op);
}
\endverbatim
* -# initialise the decoder based on the information retrieved into the
* theora_info struct by theora_decode_header(). You will need a
* theora_state struct.
\verbatim
theora_state state;
theora_decode_init(&state, &info);
\endverbatim
* -# pass in packets and retrieve decoded frames! See the yuv_buffer
* documentation for information on how to retrieve raw YUV data.
\verbatim
yuf_buffer buffer;
while (last packet was not e_o_s) {
(get a theora packet "op" from the Ogg stream)
theora_decode_packetin(&state, op);
theora_decode_YUVout(&state, &buffer);
}
\endverbatim
*
*
* \subsection identification Identifying Theora Packets
*
* All streams inside an Ogg file have a unique serial_no attached to the
* stream. Typically, you will want to
* - retrieve the serial_no for each b_o_s (beginning of stream) page
* encountered within the Ogg file;
* - test the first (only) packet on that page to determine if it is a theora
* packet;
* - once you have found a theora b_o_s page then use the retrieved serial_no
* to identify future packets belonging to the same theora stream.
*
* Note that you \e cannot use theora_packet_isheader() to determine if a
* packet is a theora packet or not, as this function does not perform any
* checking beyond whether a header bit is present. Instead, use the
* theora_decode_header() function and check the return value; or examine the
* header bytes at the beginning of the Ogg page.
*/
/** \defgroup oldfuncs Legacy pre-1.0 C API */
/* @{ */
/**
* A YUV buffer for passing uncompressed frames to and from the codec.
* This holds a Y'CbCr frame in planar format. The CbCr planes can be
* subsampled and have their own separate dimensions and row stride
* offsets. Note that the strides may be negative in some
* configurations. For theora the width and height of the largest plane
* must be a multiple of 16. The actual meaningful picture size and
* offset are stored in the theora_info structure; frames returned by
* the decoder may need to be cropped for display.
*
* All samples are 8 bits. Within each plane samples are ordered by
* row from the top of the frame to the bottom. Within each row samples
* are ordered from left to right.
*
* During decode, the yuv_buffer struct is allocated by the user, but all
* fields (including luma and chroma pointers) are filled by the library.
* These pointers address library-internal memory and their contents should
* not be modified.
*
* Conversely, during encode the user allocates the struct and fills out all
* fields. The user also manages the data addressed by the luma and chroma
* pointers. See the encoder_example.c and dump_video.c example files in
* theora/examples/ for more information.
*/
typedef struct {
int y_width; /**< Width of the Y' luminance plane */
int y_height; /**< Height of the luminance plane */
int y_stride; /**< Offset in bytes between successive rows */
int uv_width; /**< Width of the Cb and Cr chroma planes */
int uv_height; /**< Height of the chroma planes */
int uv_stride; /**< Offset between successive chroma rows */
unsigned char *y; /**< Pointer to start of luminance data */
unsigned char *u; /**< Pointer to start of Cb data */
unsigned char *v; /**< Pointer to start of Cr data */
} yuv_buffer;
/**
* A Colorspace.
*/
typedef enum {
OC_CS_UNSPECIFIED, /**< The colorspace is unknown or unspecified */
OC_CS_ITU_REC_470M, /**< This is the best option for 'NTSC' content */
OC_CS_ITU_REC_470BG, /**< This is the best option for 'PAL' content */
OC_CS_NSPACES /**< This marks the end of the defined colorspaces */
} theora_colorspace;
/**
* A Chroma subsampling
*
* These enumerate the available chroma subsampling options supported
* by the theora format. See Section 4.4 of the specification for
* exact definitions.
*/
typedef enum {
OC_PF_420, /**< Chroma subsampling by 2 in each direction (4:2:0) */
OC_PF_RSVD, /**< Reserved value */
OC_PF_422, /**< Horizonatal chroma subsampling by 2 (4:2:2) */
OC_PF_444, /**< No chroma subsampling at all (4:4:4) */
} theora_pixelformat;
/**
* Theora bitstream info.
* Contains the basic playback parameters for a stream,
* corresponding to the initial 'info' header packet.
*
* Encoded theora frames must be a multiple of 16 in width and height.
* To handle other frame sizes, a crop rectangle is specified in
* frame_height and frame_width, offset_x and * offset_y. The offset
* and size should still be a multiple of 2 to avoid chroma sampling
* shifts. Offset values in this structure are measured from the
* upper left of the image.
*
* Frame rate, in frames per second, is stored as a rational
* fraction. Aspect ratio is also stored as a rational fraction, and
* refers to the aspect ratio of the frame pixels, not of the
* overall frame itself.
*
* See <a href="http://svn.xiph.org/trunk/theora/examples/encoder_example.c">
* examples/encoder_example.c</a> for usage examples of the
* other paramters and good default settings for the encoder parameters.
*/
typedef struct {
ogg_uint32_t width; /**< encoded frame width */
ogg_uint32_t height; /**< encoded frame height */
ogg_uint32_t frame_width; /**< display frame width */
ogg_uint32_t frame_height; /**< display frame height */
ogg_uint32_t offset_x; /**< horizontal offset of the displayed frame */
ogg_uint32_t offset_y; /**< vertical offset of the displayed frame */
ogg_uint32_t fps_numerator; /**< frame rate numerator **/
ogg_uint32_t fps_denominator; /**< frame rate denominator **/
ogg_uint32_t aspect_numerator; /**< pixel aspect ratio numerator */
ogg_uint32_t aspect_denominator; /**< pixel aspect ratio denominator */
theora_colorspace colorspace; /**< colorspace */
int target_bitrate; /**< nominal bitrate in bits per second */
int quality; /**< Nominal quality setting, 0-63 */
int quick_p; /**< Quick encode/decode */
/* decode only */
unsigned char version_major;
unsigned char version_minor;
unsigned char version_subminor;
void *codec_setup;
/* encode only */
int dropframes_p;
int keyframe_auto_p;
ogg_uint32_t keyframe_frequency;
ogg_uint32_t keyframe_frequency_force; /* also used for decode init to
get granpos shift correct */
ogg_uint32_t keyframe_data_target_bitrate;
ogg_int32_t keyframe_auto_threshold;
ogg_uint32_t keyframe_mindistance;
ogg_int32_t noise_sensitivity;
ogg_int32_t sharpness;
theora_pixelformat pixelformat; /**< chroma subsampling mode to expect */
} theora_info;
/** Codec internal state and context.
*/
typedef struct{
theora_info *i;
ogg_int64_t granulepos;
void *internal_encode;
void *internal_decode;
} theora_state;
/**
* Comment header metadata.
*
* This structure holds the in-stream metadata corresponding to
* the 'comment' header packet.
*
* Meta data is stored as a series of (tag, value) pairs, in
* length-encoded string vectors. The first occurence of the
* '=' character delimits the tag and value. A particular tag
* may occur more than once. The character set encoding for
* the strings is always UTF-8, but the tag names are limited
* to case-insensitive ASCII. See the spec for details.
*
* In filling in this structure, theora_decode_header() will
* null-terminate the user_comment strings for safety. However,
* the bitstream format itself treats them as 8-bit clean,
* and so the length array should be treated as authoritative
* for their length.
*/
typedef struct theora_comment{
char **user_comments; /**< An array of comment string vectors */
int *comment_lengths; /**< An array of corresponding string vector lengths in bytes */
int comments; /**< The total number of comment string vectors */
char *vendor; /**< The vendor string identifying the encoder, null terminated */
} theora_comment;
/**\name theora_control() codes */
/* \anchor decctlcodes_old
* These are the available request codes for theora_control()
* when called with a decoder instance.
* By convention decoder control codes are odd, to distinguish
* them from \ref encctlcodes_old "encoder control codes" which
* are even.
*
* Note that since the 1.0 release, both the legacy and the final
* implementation accept all the same control codes, but only the
* final API declares the newer codes.
*
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Get the maximum post-processing level.
* The decoder supports a post-processing filter that can improve
* the appearance of the decoded images. This returns the highest
* level setting for this post-processor, corresponding to maximum
* improvement and computational expense.
*/
#define TH_DECCTL_GET_PPLEVEL_MAX (1)
/**Set the post-processing level.
* Sets the level of post-processing to use when decoding the
* compressed stream. This must be a value between zero (off)
* and the maximum returned by TH_DECCTL_GET_PPLEVEL_MAX.
*/
#define TH_DECCTL_SET_PPLEVEL (3)
/**Sets the maximum distance between key frames.
* This can be changed during an encode, but will be bounded by
* <tt>1<<th_info#keyframe_granule_shift</tt>.
* If it is set before encoding begins, th_info#keyframe_granule_shift will
* be enlarged appropriately.
*
* \param[in] buf <tt>ogg_uint32_t</tt>: The maximum distance between key
* frames.
* \param[out] buf <tt>ogg_uint32_t</tt>: The actual maximum distance set.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(ogg_uint32_t)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE (4)
/**Set the granule position.
* Call this after a seek, to update the internal granulepos
* in the decoder, to insure that subsequent frames are marked
* properly. If you track timestamps yourself and do not use
* the granule postion returned by the decoder, then you do
* not need to use this control.
*/
#define TH_DECCTL_SET_GRANPOS (5)
/**\anchor encctlcodes_old */
/**Sets the quantization parameters to use.
* The parameters are copied, not stored by reference, so they can be freed
* after this call.
* <tt>NULL</tt> may be specified to revert to the default parameters.
*
* \param[in] buf #th_quant_info
* \retval OC_FAULT \a theora_state is <tt>NULL</tt>.
* \retval OC_EINVAL Encoding has already begun, the quantization parameters
* are not acceptable to this version of the encoder,
* \a buf is <tt>NULL</tt> and \a buf_sz is not zero,
* or \a buf is non-<tt>NULL</tt> and \a buf_sz is
* not <tt>sizeof(#th_quant_info)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUANT_PARAMS (2)
/**Disables any encoder features that would prevent lossless transcoding back
* to VP3.
* This primarily means disabling block-level QI values and not using 4MV mode
* when any of the luma blocks in a macro block are not coded.
* It also includes using the VP3 quantization tables and Huffman codes; if you
* set them explicitly after calling this function, the resulting stream will
* not be VP3-compatible.
* If you enable VP3-compatibility when encoding 4:2:2 or 4:4:4 source
* material, or when using a picture region smaller than the full frame (e.g.
* a non-multiple-of-16 width or height), then non-VP3 bitstream features will
* still be disabled, but the stream will still not be VP3-compatible, as VP3
* was not capable of encoding such formats.
* If you call this after encoding has already begun, then the quantization
* tables and codebooks cannot be changed, but the frame-level features will
* be enabled or disabled as requested.
*
* \param[in] buf <tt>int</tt>: a non-zero value to enable VP3 compatibility,
* or 0 to disable it (the default).
* \param[out] buf <tt>int</tt>: 1 if all bitstream features required for
* VP3-compatibility could be set, and 0 otherwise.
* The latter will be returned if the pixel format is not
* 4:2:0, the picture region is smaller than the full frame,
* or if encoding has begun, preventing the quantization
* tables and codebooks from being set.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>.
* \retval OC_IMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_VP3_COMPATIBLE (10)
/**Gets the maximum speed level.
* Higher speed levels favor quicker encoding over better quality per bit.
* Depending on the encoding mode, and the internal algorithms used, quality
* may actually improve, but in this case bitrate will also likely increase.
* In any case, overall rate/distortion performance will probably decrease.
* The maximum value, and the meaning of each value, may change depending on
* the current encoding mode (VBR vs. CQI, etc.).
*
* \param[out] buf int: The maximum encoding speed level.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>.
* \retval OC_IMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL_MAX (12)
/**Sets the speed level.
* By default a speed value of 1 is used.
*
* \param[in] buf int: The new encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval OC_FAULT \a theora_state or \a buf is <tt>NULL</tt>.
* \retval OC_EINVAL \a buf_sz is not <tt>sizeof(int)</tt>, or the
* encoding speed level is out of bounds.
* The maximum encoding speed level may be
* implementation- and encoding mode-specific, and can be
* obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
* \retval OC_IMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_SPLEVEL (14)
/*@}*/
#define OC_FAULT -1 /**< General failure */
#define OC_EINVAL -10 /**< Library encountered invalid internal data */
#define OC_DISABLED -11 /**< Requested action is disabled */
#define OC_BADHEADER -20 /**< Header packet was corrupt/invalid */
#define OC_NOTFORMAT -21 /**< Packet is not a theora packet */
#define OC_VERSION -22 /**< Bitstream version is not handled */
#define OC_IMPL -23 /**< Feature or action not implemented */
#define OC_BADPACKET -24 /**< Packet is corrupt */
#define OC_NEWPACKET -25 /**< Packet is an (ignorable) unhandled extension */
#define OC_DUPFRAME 1 /**< Packet is a dropped frame */
/**
* Retrieve a human-readable string to identify the encoder vendor and version.
* \returns A version string.
*/
extern const char *theora_version_string(void);
/**
* Retrieve a 32-bit version number.
* This number is composed of a 16-bit major version, 8-bit minor version
* and 8 bit sub-version, composed as follows:
<pre>
(VERSION_MAJOR<<16) + (VERSION_MINOR<<8) + (VERSION_SUB)
</pre>
* \returns The version number.
*/
extern ogg_uint32_t theora_version_number(void);
/**
* Initialize the theora encoder.
* \param th The theora_state handle to initialize for encoding.
* \param ti A theora_info struct filled with the desired encoding parameters.
* \retval 0 Success
*/
extern int theora_encode_init(theora_state *th, theora_info *ti);
/**
* Submit a YUV buffer to the theora encoder.
* \param t A theora_state handle previously initialized for encoding.
* \param yuv A buffer of YUV data to encode. Note that both the yuv_buffer
* struct and the luma/chroma buffers within should be allocated by
* the user.
* \retval OC_EINVAL Encoder is not ready, or is finished.
* \retval -1 The size of the given frame differs from those previously input
* \retval 0 Success
*/
extern int theora_encode_YUVin(theora_state *t, yuv_buffer *yuv);
/**
* Request the next packet of encoded video.
* The encoded data is placed in a user-provided ogg_packet structure.
* \param t A theora_state handle previously initialized for encoding.
* \param last_p whether this is the last packet the encoder should produce.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to encoded
* data. The memory for the encoded data is owned by libtheora.
* \retval 0 No internal storage exists OR no packet is ready
* \retval -1 The encoding process has completed
* \retval 1 Success
*/
extern int theora_encode_packetout( theora_state *t, int last_p,
ogg_packet *op);
/**
* Request a packet containing the initial header.
* A pointer to the header data is placed in a user-provided ogg_packet
* structure.
* \param t A theora_state handle previously initialized for encoding.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the header
* data. The memory for the header data is owned by libtheora.
* \retval 0 Success
*/
extern int theora_encode_header(theora_state *t, ogg_packet *op);
/**
* Request a comment header packet from provided metadata.
* A pointer to the comment data is placed in a user-provided ogg_packet
* structure.
* \param tc A theora_comment structure filled with the desired metadata
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the encoded
* comment data. The memory for the comment data is owned by
* libtheora.
* \retval 0 Success
*/
extern int theora_encode_comment(theora_comment *tc, ogg_packet *op);
/**
* Request a packet containing the codebook tables for the stream.
* A pointer to the codebook data is placed in a user-provided ogg_packet
* structure.
* \param t A theora_state handle previously initialized for encoding.
* \param op An ogg_packet structure to fill. libtheora will set all
* elements of this structure, including a pointer to the codebook
* data. The memory for the header data is owned by libtheora.
* \retval 0 Success
*/
extern int theora_encode_tables(theora_state *t, ogg_packet *op);
/**
* Decode an Ogg packet, with the expectation that the packet contains
* an initial header, comment data or codebook tables.
*
* \param ci A theora_info structure to fill. This must have been previously
* initialized with theora_info_init(). If \a op contains an initial
* header, theora_decode_header() will fill \a ci with the
* parsed header values. If \a op contains codebook tables,
* theora_decode_header() will parse these and attach an internal
* representation to \a ci->codec_setup.
* \param cc A theora_comment structure to fill. If \a op contains comment
* data, theora_decode_header() will fill \a cc with the parsed
* comments.
* \param op An ogg_packet structure which you expect contains an initial
* header, comment data or codebook tables.
*
* \retval OC_BADHEADER \a op is NULL; OR the first byte of \a op->packet
* has the signature of an initial packet, but op is
* not a b_o_s packet; OR this packet has the signature
* of an initial header packet, but an initial header
* packet has already been seen; OR this packet has the
* signature of a comment packet, but the initial header
* has not yet been seen; OR this packet has the signature
* of a comment packet, but contains invalid data; OR
* this packet has the signature of codebook tables,
* but the initial header or comments have not yet
* been seen; OR this packet has the signature of codebook
* tables, but contains invalid data;
* OR the stream being decoded has a compatible version
* but this packet does not have the signature of a
* theora initial header, comments, or codebook packet
* \retval OC_VERSION The packet data of \a op is an initial header with
* a version which is incompatible with this version of
* libtheora.
* \retval OC_NEWPACKET the stream being decoded has an incompatible (future)
* version and contains an unknown signature.
* \retval 0 Success
*
* \note The normal usage is that theora_decode_header() be called on the
* first three packets of a theora logical bitstream in succession.
*/
extern int theora_decode_header(theora_info *ci, theora_comment *cc,
ogg_packet *op);
/**
* Initialize a theora_state handle for decoding.
* \param th The theora_state handle to initialize.
* \param c A theora_info struct filled with the desired decoding parameters.
* This is of course usually obtained from a previous call to
* theora_decode_header().
* \retval 0 Success
*/
extern int theora_decode_init(theora_state *th, theora_info *c);
/**
* Input a packet containing encoded data into the theora decoder.
* \param th A theora_state handle previously initialized for decoding.
* \param op An ogg_packet containing encoded theora data.
* \retval 0 Success
* \retval OC_BADPACKET \a op does not contain encoded video data
*/
extern int theora_decode_packetin(theora_state *th,ogg_packet *op);
/**
* Output the next available frame of decoded YUV data.
* \param th A theora_state handle previously initialized for decoding.
* \param yuv A yuv_buffer in which libtheora should place the decoded data.
* Note that the buffer struct itself is allocated by the user, but
* that the luma and chroma pointers will be filled in by the
* library. Also note that these luma and chroma regions should be
* considered read-only by the user.
* \retval 0 Success
*/
extern int theora_decode_YUVout(theora_state *th,yuv_buffer *yuv);
/**
* Report whether a theora packet is a header or not
* This function does no verification beyond checking the header
* flag bit so it should not be used for bitstream identification;
* use theora_decode_header() for that.
*
* \param op An ogg_packet containing encoded theora data.
* \retval 1 The packet is a header packet
* \retval 0 The packet is not a header packet (and so contains frame data)
*
* Thus function was added in the 1.0alpha4 release.
*/
extern int theora_packet_isheader(ogg_packet *op);
/**
* Report whether a theora packet is a keyframe or not
*
* \param op An ogg_packet containing encoded theora data.
* \retval 1 The packet contains a keyframe image
* \retval 0 The packet is contains an interframe delta
* \retval -1 The packet is not an image data packet at all
*
* Thus function was added in the 1.0alpha4 release.
*/
extern int theora_packet_iskeyframe(ogg_packet *op);
/**
* Report the granulepos shift radix
*
* When embedded in Ogg, Theora uses a two-part granulepos,
* splitting the 64-bit field into two pieces. The more-significant
* section represents the frame count at the last keyframe,
* and the less-significant section represents the count of
* frames since the last keyframe. In this way the overall
* field is still non-decreasing with time, but usefully encodes
* a pointer to the last keyframe, which is necessary for
* correctly restarting decode after a seek.
*
* This function reports the number of bits used to represent
* the distance to the last keyframe, and thus how the granulepos
* field must be shifted or masked to obtain the two parts.
*
* Since libtheora returns compressed data in an ogg_packet
* structure, this may be generally useful even if the Theora
* packets are not being used in an Ogg container.
*
* \param ti A previously initialized theora_info struct
* \returns The bit shift dividing the two granulepos fields
*
* This function was added in the 1.0alpha5 release.
*/
int theora_granule_shift(theora_info *ti);
/**
* Convert a granulepos to an absolute frame index, starting at 0.
* The granulepos is interpreted in the context of a given theora_state handle.
*
* Note that while the granulepos encodes the frame count (i.e. starting
* from 1) this call returns the frame index, starting from zero. Thus
* One can calculate the presentation time by multiplying the index by
* the rate.
*
* \param th A previously initialized theora_state handle (encode or decode)
* \param granulepos The granulepos to convert.
* \returns The frame index corresponding to \a granulepos.
* \retval -1 The given granulepos is undefined (i.e. negative)
*
* Thus function was added in the 1.0alpha4 release.
*/
extern ogg_int64_t theora_granule_frame(theora_state *th,ogg_int64_t granulepos);
/**
* Convert a granulepos to absolute time in seconds. The granulepos is
* interpreted in the context of a given theora_state handle, and gives
* the end time of a frame's presentation as used in Ogg mux ordering.
*
* \param th A previously initialized theora_state handle (encode or decode)
* \param granulepos The granulepos to convert.
* \returns The absolute time in seconds corresponding to \a granulepos.
* This is the "end time" for the frame, or the latest time it should
* be displayed.
* It is not the presentation time.
* \retval -1. The given granulepos is undefined (i.e. negative), or
* \retval -1. The function has been disabled because floating
* point support is not available.
*/
extern double theora_granule_time(theora_state *th,ogg_int64_t granulepos);
/**
* Initialize a theora_info structure. All values within the given theora_info
* structure are initialized, and space is allocated within libtheora for
* internal codec setup data.
* \param c A theora_info struct to initialize.
*/
extern void theora_info_init(theora_info *c);
/**
* Clear a theora_info structure. All values within the given theora_info
* structure are cleared, and associated internal codec setup data is freed.
* \param c A theora_info struct to initialize.
*/
extern void theora_info_clear(theora_info *c);
/**
* Free all internal data associated with a theora_state handle.
* \param t A theora_state handle.
*/
extern void theora_clear(theora_state *t);
/**
* Initialize an allocated theora_comment structure
* \param tc An allocated theora_comment structure
**/
extern void theora_comment_init(theora_comment *tc);
/**
* Add a comment to an initialized theora_comment structure
* \param tc A previously initialized theora comment structure
* \param comment A null-terminated string encoding the comment in the form
* "TAG=the value"
*
* Neither theora_comment_add() nor theora_comment_add_tag() support
* comments containing null values, although the bitstream format
* supports this. To add such comments you will need to manipulate
* the theora_comment structure directly.
**/
extern void theora_comment_add(theora_comment *tc, char *comment);
/**
* Add a comment to an initialized theora_comment structure.
* \param tc A previously initialized theora comment structure
* \param tag A null-terminated string containing the tag
* associated with the comment.
* \param value The corresponding value as a null-terminated string
*
* Neither theora_comment_add() nor theora_comment_add_tag() support
* comments containing null values, although the bitstream format
* supports this. To add such comments you will need to manipulate
* the theora_comment structure directly.
**/
extern void theora_comment_add_tag(theora_comment *tc,
char *tag, char *value);
/**
* Look up a comment value by tag.
* \param tc Tn initialized theora_comment structure
* \param tag The tag to look up
* \param count The instance of the tag. The same tag can appear multiple
* times, each with a distinct and ordered value, so an index
* is required to retrieve them all.
* \returns A pointer to the queried tag's value
* \retval NULL No matching tag is found
*
* \note Use theora_comment_query_count() to get the legal range for the
* count parameter.
**/
extern char *theora_comment_query(theora_comment *tc, char *tag, int count);
/** Look up the number of instances of a tag.
* \param tc An initialized theora_comment structure
* \param tag The tag to look up
* \returns The number on instances of a particular tag.
*
* Call this first when querying for a specific tag and then interate
* over the number of instances with separate calls to
* theora_comment_query() to retrieve all instances in order.
**/
extern int theora_comment_query_count(theora_comment *tc, char *tag);
/**
* Clear an allocated theora_comment struct so that it can be freed.
* \param tc An allocated theora_comment structure.
**/
extern void theora_comment_clear(theora_comment *tc);
/**Encoder control function.
* This is used to provide advanced control the encoding process.
* \param th A #theora_state handle.
* \param req The control code to process.
* See \ref encctlcodes_old "the list of available
* control codes" for details.
* \param buf The parameters for this control code.
* \param buf_sz The size of the parameter buffer.*/
extern int theora_control(theora_state *th,int req,void *buf,size_t buf_sz);
/* @} */ /* end oldfuncs doxygen group */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _O_THEORA_H_ */

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\file
* The <tt>libtheoradec</tt> C decoding API.*/
#if !defined(_O_THEORA_THEORADEC_H_)
# define _O_THEORA_THEORADEC_H_ (1)
# include <stddef.h>
# include <ogg/ogg.h>
# include "codec.h"
#if defined(__cplusplus)
extern "C" {
#endif
/**\name th_decode_ctl() codes
* \anchor decctlcodes
* These are the available request codes for th_decode_ctl().
* By convention, these are odd, to distinguish them from the
* \ref encctlcodes "encoder control codes".
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Gets the maximum post-processing level.
* The decoder supports a post-processing filter that can improve
* the appearance of the decoded images. This returns the highest
* level setting for this post-processor, corresponding to maximum
* improvement and computational expense.
*
* \param[out] _buf int: The maximum post-processing level.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_DECCTL_GET_PPLEVEL_MAX (1)
/**Sets the post-processing level.
* By default, post-processing is disabled.
*
* Sets the level of post-processing to use when decoding the
* compressed stream. This must be a value between zero (off)
* and the maximum returned by TH_DECCTL_GET_PPLEVEL_MAX.
*
* \param[in] _buf int: The new post-processing level.
* 0 to disable; larger values use more CPU.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* post-processing level is out of bounds.
* The maximum post-processing level may be
* implementation-specific, and can be obtained via
* #TH_DECCTL_GET_PPLEVEL_MAX.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_DECCTL_SET_PPLEVEL (3)
/**Sets the granule position.
* Call this after a seek, before decoding the first frame, to ensure that the
* proper granule position is returned for all subsequent frames.
* If you track timestamps yourself and do not use the granule position
* returned by the decoder, then you need not call this function.
*
* \param[in] _buf <tt>ogg_int64_t</tt>: The granule position of the next
* frame.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(ogg_int64_t)</tt>, or the
* granule position is negative.*/
#define TH_DECCTL_SET_GRANPOS (5)
/**Sets the striped decode callback function.
* If set, this function will be called as each piece of a frame is fully
* decoded in th_decode_packetin().
* You can pass in a #th_stripe_callback with
* th_stripe_callback#stripe_decoded set to <tt>NULL</tt> to disable the
* callbacks at any point.
* Enabling striped decode does not prevent you from calling
* th_decode_ycbcr_out() after the frame is fully decoded.
*
* \param[in] _buf #th_stripe_callback: The callback parameters.
* \retval TH_EFAULT \a _dec_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not
* <tt>sizeof(th_stripe_callback)</tt>.*/
#define TH_DECCTL_SET_STRIPE_CB (7)
/**Enables telemetry and sets the macroblock display mode */
#define TH_DECCTL_SET_TELEMETRY_MBMODE (9)
/**Enables telemetry and sets the motion vector display mode */
#define TH_DECCTL_SET_TELEMETRY_MV (11)
/**Enables telemetry and sets the adaptive quantization display mode */
#define TH_DECCTL_SET_TELEMETRY_QI (13)
/**Enables telemetry and sets the bitstream breakdown visualization mode */
#define TH_DECCTL_SET_TELEMETRY_BITS (15)
/*@}*/
/**A callback function for striped decode.
* This is a function pointer to an application-provided function that will be
* called each time a section of the image is fully decoded in
* th_decode_packetin().
* This allows the application to process the section immediately, while it is
* still in cache.
* Note that the frame is decoded bottom to top, so \a _yfrag0 will steadily
* decrease with each call until it reaches 0, at which point the full frame
* is decoded.
* The number of fragment rows made available in each call depends on the pixel
* format and the number of post-processing filters enabled, and may not even
* be constant for the entire frame.
* If a non-<tt>NULL</tt> \a _granpos pointer is passed to
* th_decode_packetin(), the granule position for the frame will be stored
* in it before the first callback is made.
* If an entire frame is dropped (a 0-byte packet), then no callbacks will be
* made at all for that frame.
* \param _ctx An application-provided context pointer.
* \param _buf The image buffer for the decoded frame.
* \param _yfrag0 The Y coordinate of the first row of 8x8 fragments
* decoded.
* Multiply this by 8 to obtain the pixel row number in the
* luma plane.
* If the chroma planes are subsampled in the Y direction,
* this will always be divisible by two.
* \param _yfrag_end The Y coordinate of the first row of 8x8 fragments past
* the newly decoded section.
* If the chroma planes are subsampled in the Y direction,
* this will always be divisible by two.
* I.e., this section contains fragment rows
* <tt>\a _yfrag0 ...\a _yfrag_end -1</tt>.*/
typedef void (*th_stripe_decoded_func)(void *_ctx,th_ycbcr_buffer _buf,
int _yfrag0,int _yfrag_end);
/**The striped decode callback data to pass to #TH_DECCTL_SET_STRIPE_CB.*/
typedef struct{
/**An application-provided context pointer.
* This will be passed back verbatim to the application.*/
void *ctx;
/**The callback function pointer.*/
th_stripe_decoded_func stripe_decoded;
}th_stripe_callback;
/**\name Decoder state
The following data structures are opaque, and their contents are not
publicly defined by this API.
Referring to their internals directly is unsupported, and may break without
warning.*/
/*@{*/
/**The decoder context.*/
typedef struct th_dec_ctx th_dec_ctx;
/**Setup information.
This contains auxiliary information (Huffman tables and quantization
parameters) decoded from the setup header by th_decode_headerin() to be
passed to th_decode_alloc().
It can be re-used to initialize any number of decoders, and can be freed
via th_setup_free() at any time.*/
typedef struct th_setup_info th_setup_info;
/*@}*/
/**\defgroup decfuncs Functions for Decoding*/
/*@{*/
/**\name Functions for decoding
* You must link to <tt>libtheoradec</tt> if you use any of the
* functions in this section.
*
* The functions are listed in the order they are used in a typical decode.
* The basic steps are:
* - Parse the header packets by repeatedly calling th_decode_headerin().
* - Allocate a #th_dec_ctx handle with th_decode_alloc().
* - Call th_setup_free() to free any memory used for codec setup
* information.
* - Perform any additional decoder configuration with th_decode_ctl().
* - For each video data packet:
* - Submit the packet to the decoder via th_decode_packetin().
* - Retrieve the uncompressed video data via th_decode_ycbcr_out().
* - Call th_decode_free() to release all decoder memory.*/
/*@{*/
/**Decodes the header packets of a Theora stream.
* This should be called on the initial packets of the stream, in succession,
* until it returns <tt>0</tt>, indicating that all headers have been
* processed, or an error is encountered.
* At least three header packets are required, and additional optional header
* packets may follow.
* This can be used on the first packet of any logical stream to determine if
* that stream is a Theora stream.
* \param _info A #th_info structure to fill in.
* This must have been previously initialized with
* th_info_init().
* The application may immediately begin using the contents of
* this structure after the first header is decoded, though it
* must continue to be passed in on all subsequent calls.
* \param _tc A #th_comment structure to fill in.
* The application may immediately begin using the contents of
* this structure after the second header is decoded, though it
* must continue to be passed in on all subsequent calls.
* \param _setup Returns a pointer to additional, private setup information
* needed by the decoder.
* The contents of this pointer must be initialized to
* <tt>NULL</tt> on the first call, and the returned value must
* continue to be passed in on all subsequent calls.
* \param _op An <tt>ogg_packet</tt> structure which contains one of the
* initial packets of an Ogg logical stream.
* \return A positive value indicates that a Theora header was successfully
* processed.
* \retval 0 The first video data packet was encountered after all
* required header packets were parsed.
* The packet just passed in on this call should be saved
* and fed to th_decode_packetin() to begin decoding
* video data.
* \retval TH_EFAULT One of \a _info, \a _tc, or \a _setup was
* <tt>NULL</tt>.
* \retval TH_EBADHEADER \a _op was <tt>NULL</tt>, the packet was not the next
* header packet in the expected sequence, or the format
* of the header data was invalid.
* \retval TH_EVERSION The packet data was a Theora info header, but for a
* bitstream version not decodable with this version of
* <tt>libtheoradec</tt>.
* \retval TH_ENOTFORMAT The packet was not a Theora header.
*/
extern int th_decode_headerin(th_info *_info,th_comment *_tc,
th_setup_info **_setup,ogg_packet *_op);
/**Allocates a decoder instance.
*
* <b>Security Warning:</b> The Theora format supports very large frame sizes,
* potentially even larger than the address space of a 32-bit machine, and
* creating a decoder context allocates the space for several frames of data.
* If the allocation fails here, your program will crash, possibly at some
* future point because the OS kernel returned a valid memory range and will
* only fail when it tries to map the pages in it the first time they are
* used.
* Even if it succeeds, you may experience a denial of service if the frame
* size is large enough to cause excessive paging.
* If you are integrating libtheora in a larger application where such things
* are undesirable, it is highly recommended that you check the frame size in
* \a _info before calling this function and refuse to decode streams where it
* is larger than some reasonable maximum.
* libtheora will not check this for you, because there may be machines that
* can handle such streams and applications that wish to.
* \param _info A #th_info struct filled via th_decode_headerin().
* \param _setup A #th_setup_info handle returned via
* th_decode_headerin().
* \return The initialized #th_dec_ctx handle.
* \retval NULL If the decoding parameters were invalid.*/
extern th_dec_ctx *th_decode_alloc(const th_info *_info,
const th_setup_info *_setup);
/**Releases all storage used for the decoder setup information.
* This should be called after you no longer want to create any decoders for
* a stream whose headers you have parsed with th_decode_headerin().
* \param _setup The setup information to free.
* This can safely be <tt>NULL</tt>.*/
extern void th_setup_free(th_setup_info *_setup);
/**Decoder control function.
* This is used to provide advanced control of the decoding process.
* \param _dec A #th_dec_ctx handle.
* \param _req The control code to process.
* See \ref decctlcodes "the list of available control codes"
* for details.
* \param _buf The parameters for this control code.
* \param _buf_sz The size of the parameter buffer.*/
extern int th_decode_ctl(th_dec_ctx *_dec,int _req,void *_buf,
size_t _buf_sz);
/**Submits a packet containing encoded video data to the decoder.
* \param _dec A #th_dec_ctx handle.
* \param _op An <tt>ogg_packet</tt> containing encoded video data.
* \param _granpos Returns the granule position of the decoded packet.
* If non-<tt>NULL</tt>, the granule position for this specific
* packet is stored in this location.
* This is computed incrementally from previously decoded
* packets.
* After a seek, the correct granule position must be set via
* #TH_DECCTL_SET_GRANPOS for this to work properly.
* \retval 0 Success.
* A new decoded frame can be retrieved by calling
* th_decode_ycbcr_out().
* \retval TH_DUPFRAME The packet represented a dropped (0-byte) frame.
* The player can skip the call to th_decode_ycbcr_out(),
* as the contents of the decoded frame buffer have not
* changed.
* \retval TH_EFAULT \a _dec or \a _op was <tt>NULL</tt>.
* \retval TH_EBADPACKET \a _op does not contain encoded video data.
* \retval TH_EIMPL The video data uses bitstream features which this
* library does not support.*/
extern int th_decode_packetin(th_dec_ctx *_dec,const ogg_packet *_op,
ogg_int64_t *_granpos);
/**Outputs the next available frame of decoded Y'CbCr data.
* If a striped decode callback has been set with #TH_DECCTL_SET_STRIPE_CB,
* then the application does not need to call this function.
* \param _dec A #th_dec_ctx handle.
* \param _ycbcr A video buffer structure to fill in.
* <tt>libtheoradec</tt> will fill in all the members of this
* structure, including the pointers to the uncompressed video
* data.
* The memory for this video data is owned by
* <tt>libtheoradec</tt>.
* It may be freed or overwritten without notification when
* subsequent frames are decoded.
* \retval 0 Success
* \retval TH_EFAULT \a _dec or \a _ycbcr was <tt>NULL</tt>.
*/
extern int th_decode_ycbcr_out(th_dec_ctx *_dec,
th_ycbcr_buffer _ycbcr);
/**Frees an allocated decoder instance.
* \param _dec A #th_dec_ctx handle.*/
extern void th_decode_free(th_dec_ctx *_dec);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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/********************************************************************
* *
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function:
last mod: $Id: theora.h,v 1.8 2004/03/15 22:17:32 derf Exp $
********************************************************************/
/**\file
* The <tt>libtheoraenc</tt> C encoding API.*/
#if !defined(_O_THEORA_THEORAENC_H_)
# define _O_THEORA_THEORAENC_H_ (1)
# include <stddef.h>
# include <ogg/ogg.h>
# include "codec.h"
#if defined(__cplusplus)
extern "C" {
#endif
/**\name th_encode_ctl() codes
* \anchor encctlcodes
* These are the available request codes for th_encode_ctl().
* By convention, these are even, to distinguish them from the
* \ref decctlcodes "decoder control codes".
* Keep any experimental or vendor-specific values above \c 0x8000.*/
/*@{*/
/**Sets the Huffman tables to use.
* The tables are copied, not stored by reference, so they can be freed after
* this call.
* <tt>NULL</tt> may be specified to revert to the default tables.
*
* \param[in] _buf <tt>#th_huff_code[#TH_NHUFFMAN_TABLES][#TH_NDCT_TOKENS]</tt>
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL Encoding has already begun or one or more of the given
* tables is not full or prefix-free, \a _buf is
* <tt>NULL</tt> and \a _buf_sz is not zero, or \a _buf is
* non-<tt>NULL</tt> and \a _buf_sz is not
* <tt>sizeof(#th_huff_code)*#TH_NHUFFMAN_TABLES*#TH_NDCT_TOKENS</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_HUFFMAN_CODES (0)
/**Sets the quantization parameters to use.
* The parameters are copied, not stored by reference, so they can be freed
* after this call.
* <tt>NULL</tt> may be specified to revert to the default parameters.
*
* \param[in] _buf #th_quant_info
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL Encoding has already begun, \a _buf is
* <tt>NULL</tt> and \a _buf_sz is not zero,
* or \a _buf is non-<tt>NULL</tt> and
* \a _buf_sz is not <tt>sizeof(#th_quant_info)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUANT_PARAMS (2)
/**Sets the maximum distance between key frames.
* This can be changed during an encode, but will be bounded by
* <tt>1<<th_info#keyframe_granule_shift</tt>.
* If it is set before encoding begins, th_info#keyframe_granule_shift will
* be enlarged appropriately.
*
* \param[in] _buf <tt>ogg_uint32_t</tt>: The maximum distance between key
* frames.
* \param[out] _buf <tt>ogg_uint32_t</tt>: The actual maximum distance set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(ogg_uint32_t)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE (4)
/**Disables any encoder features that would prevent lossless transcoding back
* to VP3.
* This primarily means disabling block-adaptive quantization and always coding
* all four luma blocks in a macro block when 4MV is used.
* It also includes using the VP3 quantization tables and Huffman codes; if you
* set them explicitly after calling this function, the resulting stream will
* not be VP3-compatible.
* If you enable VP3-compatibility when encoding 4:2:2 or 4:4:4 source
* material, or when using a picture region smaller than the full frame (e.g.
* a non-multiple-of-16 width or height), then non-VP3 bitstream features will
* still be disabled, but the stream will still not be VP3-compatible, as VP3
* was not capable of encoding such formats.
* If you call this after encoding has already begun, then the quantization
* tables and codebooks cannot be changed, but the frame-level features will
* be enabled or disabled as requested.
*
* \param[in] _buf <tt>int</tt>: a non-zero value to enable VP3 compatibility,
* or 0 to disable it (the default).
* \param[out] _buf <tt>int</tt>: 1 if all bitstream features required for
* VP3-compatibility could be set, and 0 otherwise.
* The latter will be returned if the pixel format is not
* 4:2:0, the picture region is smaller than the full frame,
* or if encoding has begun, preventing the quantization
* tables and codebooks from being set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_VP3_COMPATIBLE (10)
/**Gets the maximum speed level.
* Higher speed levels favor quicker encoding over better quality per bit.
* Depending on the encoding mode, and the internal algorithms used, quality
* may actually improve, but in this case bitrate will also likely increase.
* In any case, overall rate/distortion performance will probably decrease.
* The maximum value, and the meaning of each value, may change depending on
* the current encoding mode (VBR vs. constant quality, etc.).
*
* \param[out] _buf <tt>int</tt>: The maximum encoding speed level.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL_MAX (12)
/**Sets the speed level.
* The current speed level may be retrieved using #TH_ENCCTL_GET_SPLEVEL.
*
* \param[in] _buf <tt>int</tt>: The new encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* encoding speed level is out of bounds.
* The maximum encoding speed level may be
* implementation- and encoding mode-specific, and can be
* obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_SPLEVEL (14)
/**Gets the current speed level.
* The default speed level may vary according to encoder implementation, but if
* this control code is not supported (it returns #TH_EIMPL), the default may
* be assumed to be the slowest available speed (0).
* The maximum encoding speed level may be implementation- and encoding
* mode-specific, and can be obtained via #TH_ENCCTL_GET_SPLEVEL_MAX.
*
* \param[out] _buf <tt>int</tt>: The current encoding speed level.
* 0 is slowest, larger values use less CPU.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_GET_SPLEVEL (16)
/**Sets the number of duplicates of the next frame to produce.
* Although libtheora can encode duplicate frames very cheaply, it costs some
* amount of CPU to detect them, and a run of duplicates cannot span a
* keyframe boundary.
* This control code tells the encoder to produce the specified number of extra
* duplicates of the next frame.
* This allows the encoder to make smarter keyframe placement decisions and
* rate control decisions, and reduces CPU usage as well, when compared to
* just submitting the same frame for encoding multiple times.
* This setting only applies to the next frame submitted for encoding.
* You MUST call th_encode_packetout() repeatedly until it returns 0, or the
* extra duplicate frames will be lost.
*
* \param[in] _buf <tt>int</tt>: The number of duplicates to produce.
* If this is negative or zero, no duplicates will be produced.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or the
* number of duplicates is greater than or equal to the
* maximum keyframe interval.
* In the latter case, NO duplicate frames will be produced.
* You must ensure that the maximum keyframe interval is set
* larger than the maximum number of duplicates you will
* ever wish to insert prior to encoding.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_DUP_COUNT (18)
/**Modifies the default bitrate management behavior.
* Use to allow or disallow frame dropping, and to enable or disable capping
* bit reservoir overflows and underflows.
* See \ref encctlcodes "the list of available flags".
* The flags are set by default to
* <tt>#TH_RATECTL_DROP_FRAMES|#TH_RATECTL_CAP_OVERFLOW</tt>.
*
* \param[in] _buf <tt>int</tt>: Any combination of
* \ref ratectlflags "the available flags":
* - #TH_RATECTL_DROP_FRAMES: Enable frame dropping.
* - #TH_RATECTL_CAP_OVERFLOW: Don't bank excess bits for later
* use.
* - #TH_RATECTL_CAP_UNDERFLOW: Don't try to make up shortfalls
* later.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt> or rate control
* is not enabled.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_RATE_FLAGS (20)
/**Sets the size of the bitrate management bit reservoir as a function
* of number of frames.
* The reservoir size affects how quickly bitrate management reacts to
* instantaneous changes in the video complexity.
* Larger reservoirs react more slowly, and provide better overall quality, but
* require more buffering by a client, adding more latency to live streams.
* By default, libtheora sets the reservoir to the maximum distance between
* keyframes, subject to a minimum and maximum limit.
* This call may be used to increase or decrease the reservoir, increasing or
* decreasing the allowed temporary variance in bitrate.
* An implementation may impose some limits on the size of a reservoir it can
* handle, in which case the actual reservoir size may not be exactly what was
* requested.
* The actual value set will be returned.
*
* \param[in] _buf <tt>int</tt>: Requested size of the reservoir measured in
* frames.
* \param[out] _buf <tt>int</tt>: The actual size of the reservoir set.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(int)</tt>, or rate control
* is not enabled. The buffer has an implementation
* defined minimum and maximum size and the value in _buf
* will be adjusted to match the actual value set.
* \retval TH_EIMPL Not supported by this implementation in the current
* encoding mode.*/
#define TH_ENCCTL_SET_RATE_BUFFER (22)
/**Enable pass 1 of two-pass encoding mode and retrieve the first pass metrics.
* Pass 1 mode must be enabled before the first frame is encoded, and a target
* bitrate must have already been specified to the encoder.
* Although this does not have to be the exact rate that will be used in the
* second pass, closer values may produce better results.
* The first call returns the size of the two-pass header data, along with some
* placeholder content, and sets the encoder into pass 1 mode implicitly.
* This call sets the encoder to pass 1 mode implicitly.
* Then, a subsequent call must be made after each call to
* th_encode_ycbcr_in() to retrieve the metrics for that frame.
* An additional, final call must be made to retrieve the summary data,
* containing such information as the total number of frames, etc.
* This must be stored in place of the placeholder data that was returned
* in the first call, before the frame metrics data.
* All of this data must be presented back to the encoder during pass 2 using
* #TH_ENCCTL_2PASS_IN.
*
* \param[out] <tt>char *</tt>_buf: Returns a pointer to internal storage
* containing the two pass metrics data.
* This storage is only valid until the next call, or until the
* encoder context is freed, and must be copied by the
* application.
* \retval >=0 The number of bytes of metric data available in the
* returned buffer.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL \a _buf_sz is not <tt>sizeof(char *)</tt>, no target
* bitrate has been set, or the first call was made after
* the first frame was submitted for encoding.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_2PASS_OUT (24)
/**Submits two-pass encoding metric data collected the first encoding pass to
* the second pass.
* The first call must be made before the first frame is encoded, and a target
* bitrate must have already been specified to the encoder.
* It sets the encoder to pass 2 mode implicitly; this cannot be disabled.
* The encoder may require reading data from some or all of the frames in
* advance, depending on, e.g., the reservoir size used in the second pass.
* You must call this function repeatedly before each frame to provide data
* until either a) it fails to consume all of the data presented or b) all of
* the pass 1 data has been consumed.
* In the first case, you must save the remaining data to be presented after
* the next frame.
* You can call this function with a NULL argument to get an upper bound on
* the number of bytes that will be required before the next frame.
*
* When pass 2 is first enabled, the default bit reservoir is set to the entire
* file; this gives maximum flexibility but can lead to very high peak rates.
* You can subsequently set it to another value with #TH_ENCCTL_SET_RATE_BUFFER
* (e.g., to set it to the keyframe interval for non-live streaming), however,
* you may then need to provide more data before the next frame.
*
* \param[in] _buf <tt>char[]</tt>: A buffer containing the data returned by
* #TH_ENCCTL_2PASS_OUT in pass 1.
* You may pass <tt>NULL</tt> for \a _buf to return an upper
* bound on the number of additional bytes needed before the
* next frame.
* The summary data returned at the end of pass 1 must be at
* the head of the buffer on the first call with a
* non-<tt>NULL</tt> \a _buf, and the placeholder data
* returned at the start of pass 1 should be omitted.
* After each call you should advance this buffer by the number
* of bytes consumed.
* \retval >0 The number of bytes of metric data required/consumed.
* \retval 0 No more data is required before the next frame.
* \retval TH_EFAULT \a _enc_ctx is <tt>NULL</tt>.
* \retval TH_EINVAL No target bitrate has been set, or the first call was
* made after the first frame was submitted for
* encoding.
* \retval TH_ENOTFORMAT The data did not appear to be pass 1 from a compatible
* implementation of this library.
* \retval TH_EBADHEADER The data was invalid; this may be returned when
* attempting to read an aborted pass 1 file that still
* has the placeholder data in place of the summary
* data.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_2PASS_IN (26)
/**Sets the current encoding quality.
* This is only valid so long as no bitrate has been specified, either through
* the #th_info struct used to initialize the encoder or through
* #TH_ENCCTL_SET_BITRATE (this restriction may be relaxed in a future
* version).
* If it is set before the headers are emitted, the target quality encoded in
* them will be updated.
*
* \param[in] _buf <tt>int</tt>: The new target quality, in the range 0...63,
* inclusive.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL A target bitrate has already been specified, or the
* quality index was not in the range 0...63.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_QUALITY (28)
/**Sets the current encoding bitrate.
* Once a bitrate is set, the encoder must use a rate-controlled mode for all
* future frames (this restriction may be relaxed in a future version).
* If it is set before the headers are emitted, the target bitrate encoded in
* them will be updated.
* Due to the buffer delay, the exact bitrate of each section of the encode is
* not guaranteed.
* The encoder may have already used more bits than allowed for the frames it
* has encoded, expecting to make them up in future frames, or it may have
* used fewer, holding the excess in reserve.
* The exact transition between the two bitrates is not well-defined by this
* API, but may be affected by flags set with #TH_ENCCTL_SET_RATE_FLAGS.
* After a number of frames equal to the buffer delay, one may expect further
* output to average at the target bitrate.
*
* \param[in] _buf <tt>long</tt>: The new target bitrate, in bits per second.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc_ctx or \a _buf is <tt>NULL</tt>.
* \retval TH_EINVAL The target bitrate was not positive.
* \retval TH_EIMPL Not supported by this implementation.*/
#define TH_ENCCTL_SET_BITRATE (30)
/*@}*/
/**\name TH_ENCCTL_SET_RATE_FLAGS flags
* \anchor ratectlflags
* These are the flags available for use with #TH_ENCCTL_SET_RATE_FLAGS.*/
/*@{*/
/**Drop frames to keep within bitrate buffer constraints.
* This can have a severe impact on quality, but is the only way to ensure that
* bitrate targets are met at low rates during sudden bursts of activity.*/
#define TH_RATECTL_DROP_FRAMES (0x1)
/**Ignore bitrate buffer overflows.
* If the encoder uses so few bits that the reservoir of available bits
* overflows, ignore the excess.
* The encoder will not try to use these extra bits in future frames.
* At high rates this may cause the result to be undersized, but allows a
* client to play the stream using a finite buffer; it should normally be
* enabled.*/
#define TH_RATECTL_CAP_OVERFLOW (0x2)
/**Ignore bitrate buffer underflows.
* If the encoder uses so many bits that the reservoir of available bits
* underflows, ignore the deficit.
* The encoder will not try to make up these extra bits in future frames.
* At low rates this may cause the result to be oversized; it should normally
* be disabled.*/
#define TH_RATECTL_CAP_UNDERFLOW (0x4)
/*@}*/
/**The quantization parameters used by VP3.*/
extern const th_quant_info TH_VP31_QUANT_INFO;
/**The Huffman tables used by VP3.*/
extern const th_huff_code
TH_VP31_HUFF_CODES[TH_NHUFFMAN_TABLES][TH_NDCT_TOKENS];
/**\name Encoder state
The following data structure is opaque, and its contents are not publicly
defined by this API.
Referring to its internals directly is unsupported, and may break without
warning.*/
/*@{*/
/**The encoder context.*/
typedef struct th_enc_ctx th_enc_ctx;
/*@}*/
/**\defgroup encfuncs Functions for Encoding*/
/*@{*/
/**\name Functions for encoding
* You must link to <tt>libtheoraenc</tt> and <tt>libtheoradec</tt>
* if you use any of the functions in this section.
*
* The functions are listed in the order they are used in a typical encode.
* The basic steps are:
* - Fill in a #th_info structure with details on the format of the video you
* wish to encode.
* - Allocate a #th_enc_ctx handle with th_encode_alloc().
* - Perform any additional encoder configuration required with
* th_encode_ctl().
* - Repeatedly call th_encode_flushheader() to retrieve all the header
* packets.
* - For each uncompressed frame:
* - Submit the uncompressed frame via th_encode_ycbcr_in()
* - Repeatedly call th_encode_packetout() to retrieve any video data packets
* that are ready.
* - Call th_encode_free() to release all encoder memory.*/
/*@{*/
/**Allocates an encoder instance.
* \param _info A #th_info struct filled with the desired encoding parameters.
* \return The initialized #th_enc_ctx handle.
* \retval NULL If the encoding parameters were invalid.*/
extern th_enc_ctx *th_encode_alloc(const th_info *_info);
/**Encoder control function.
* This is used to provide advanced control the encoding process.
* \param _enc A #th_enc_ctx handle.
* \param _req The control code to process.
* See \ref encctlcodes "the list of available control codes"
* for details.
* \param _buf The parameters for this control code.
* \param _buf_sz The size of the parameter buffer.*/
extern int th_encode_ctl(th_enc_ctx *_enc,int _req,void *_buf,size_t _buf_sz);
/**Outputs the next header packet.
* This should be called repeatedly after encoder initialization until it
* returns 0 in order to get all of the header packets, in order, before
* encoding actual video data.
* \param _enc A #th_enc_ctx handle.
* \param _comments The metadata to place in the comment header, when it is
* encoded.
* \param _op An <tt>ogg_packet</tt> structure to fill.
* All of the elements of this structure will be set,
* including a pointer to the header data.
* The memory for the header data is owned by
* <tt>libtheoraenc</tt>, and may be invalidated when the
* next encoder function is called.
* \return A positive value indicates that a header packet was successfully
* produced.
* \retval 0 No packet was produced, and no more header packets remain.
* \retval TH_EFAULT \a _enc, \a _comments, or \a _op was <tt>NULL</tt>.*/
extern int th_encode_flushheader(th_enc_ctx *_enc,
th_comment *_comments,ogg_packet *_op);
/**Submits an uncompressed frame to the encoder.
* \param _enc A #th_enc_ctx handle.
* \param _ycbcr A buffer of Y'CbCr data to encode.
* \retval 0 Success.
* \retval TH_EFAULT \a _enc or \a _ycbcr is <tt>NULL</tt>.
* \retval TH_EINVAL The buffer size does not match the frame size the encoder
* was initialized with, or encoding has already
* completed.*/
extern int th_encode_ycbcr_in(th_enc_ctx *_enc,th_ycbcr_buffer _ycbcr);
/**Retrieves encoded video data packets.
* This should be called repeatedly after each frame is submitted to flush any
* encoded packets, until it returns 0.
* The encoder will not buffer these packets as subsequent frames are
* compressed, so a failure to do so will result in lost video data.
* \note Currently the encoder operates in a one-frame-in, one-packet-out
* manner.
* However, this may be changed in the future.
* \param _enc A #th_enc_ctx handle.
* \param _last Set this flag to a non-zero value if no more uncompressed
* frames will be submitted.
* This ensures that a proper EOS flag is set on the last packet.
* \param _op An <tt>ogg_packet</tt> structure to fill.
* All of the elements of this structure will be set, including a
* pointer to the video data.
* The memory for the video data is owned by
* <tt>libtheoraenc</tt>, and may be invalidated when the next
* encoder function is called.
* \return A positive value indicates that a video data packet was successfully
* produced.
* \retval 0 No packet was produced, and no more encoded video data
* remains.
* \retval TH_EFAULT \a _enc or \a _op was <tt>NULL</tt>.*/
extern int th_encode_packetout(th_enc_ctx *_enc,int _last,ogg_packet *_op);
/**Frees an allocated encoder instance.
* \param _enc A #th_enc_ctx handle.*/
extern void th_encode_free(th_enc_ctx *_enc);
/*@}*/
/*@}*/
#if defined(__cplusplus)
}
#endif
#endif

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