487 lines
25 KiB
C++
487 lines
25 KiB
C++
/********************************************************************
|
|
* *
|
|
* 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
|