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almost complete implementation

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2026-06-07 00:40:27 +03:00
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vendor/include/libavcodec/codec_par.h
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/*
* Codec parameters public API
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_CODEC_PAR_H
#define AVCODEC_CODEC_PAR_H
#include <stdint.h>
#include "libavutil/avutil.h"
#include "libavutil/channel_layout.h"
#include "libavutil/rational.h"
#include "libavutil/pixfmt.h"
#include "codec_id.h"
#include "defs.h"
#include "packet.h"
/**
* @defgroup lavc_codec_params Codec parameters
* @ingroup lavc_core
* @{
*/
/**
* This struct describes the properties of an encoded stream.
*
* @note
* The `sizeof(AVCodecParameters)` is not a part of the public ABI,
* therefore this struct must be allocated with ::avcodec_parameters_alloc()
* and freed with ::avcodec_parameters_free().
*/
typedef struct AVCodecParameters {
/**
* General type of the encoded data.
*/
enum AVMediaType codec_type;
/**
* Specific type of the encoded data (the codec used).
*/
enum AVCodecID codec_id;
/**
* Additional information about the codec (corresponds to the AVI FOURCC).
*/
uint32_t codec_tag;
/**
* Extra binary data needed for initializing the decoder, codec-dependent.
*
* Must be allocated with ::av_malloc() and will be freed by
* ::avcodec_parameters_free(). The allocated size of extradata must be at
* least #extradata_size + ::AV_INPUT_BUFFER_PADDING_SIZE, with the padding
* bytes zeroed.
*/
uint8_t *extradata;
/**
* Size of the extradata content in bytes.
*/
int extradata_size;
/**
* Additional data associated with the entire stream.
*
* Should be allocated with ::av_packet_side_data_new() or
* ::av_packet_side_data_add(), and will be freed by ::avcodec_parameters_free().
*/
AVPacketSideData *coded_side_data;
/**
* Amount of entries in #coded_side_data.
*/
int nb_coded_side_data;
/**
* - Video: the pixel format, the value corresponds to enum ::AVPixelFormat.
* - Audio: the sample format, the value corresponds to enum ::AVSampleFormat.
*/
int format;
/**
* The average bitrate of the encoded data (in bits per second).
*/
int64_t bit_rate;
/**
* The number of bits per sample in the codedwords.
*
* This is basically the bitrate per sample. It is mandatory for a bunch of
* formats to actually decode them. It's the number of bits for one sample in
* the actual coded bitstream.
*
* This could be, for example, 4, for ADPCM.
* For PCM formats this matches #bits_per_raw_sample.
*
* Can be 0.
*/
int bits_per_coded_sample;
/**
* The number of valid bits in each output sample.
*
* If the sample format has more bits, the least significant bits are additional
* padding bits, which are always 0. Use right shifts to reduce the sample
* to its actual size.
*
* For example, audio formats with 24-bit samples will have #bits_per_raw_sample
* set to 24, and ::format set to ::AV_SAMPLE_FMT_S32. To get the original sample,
* use: `(int32_t)sample >> 8`.
*
* For ADPCM, this might be 12 or 16, or similar.
*
* Can be 0.
*/
int bits_per_raw_sample;
/**
* Codec-specific bitstream restrictions that the stream conforms to.
*/
int profile;
int level;
/**
* The width of the video frame in pixels.
*
* Video only.
*/
int width;
/**
* The height of the video frame in pixels.
*
* Video only.
*/
int height;
/**
* The aspect ratio (width/height) which a single pixel
* should have when displayed.
*
* When the aspect ratio is unknown or undefined, the numerator should be
* set to 0 (the denominator may have any value).
*
* Video only.
*/
AVRational sample_aspect_ratio;
/**
* Number of frames per second, for streams with constant frame
* durations. Should be set to `{ 0, 1 }` when some frames have differing
* durations or if the value is not known.
*
* @note This field corresponds to values that are stored in codec-level
* headers and is typically overridden by container/transport-layer
* timestamps, when available. It should thus be used only as a last resort,
* when no higher-level timing information is available.
*
* Video only.
*/
AVRational framerate;
/**
* The order of the fields in interlaced video.
*
* Video only.
*/
enum AVFieldOrder field_order;
/**
* Additional colorspace characteristics.
*
* Video only.
*/
enum AVColorRange color_range;
enum AVColorPrimaries color_primaries;
enum AVColorTransferCharacteristic color_trc;
enum AVColorSpace color_space;
enum AVChromaLocation chroma_location;
/**
* Number of delayed frames.
*
* Video only.
*/
int video_delay;
/**
* The channel layout and number of channels.
*
* Audio only.
*/
AVChannelLayout ch_layout;
/**
* The number of audio samples per second.
*
* Audio only.
*/
int sample_rate;
/**
* The number of bytes per coded audio frame, required by some formats.
*
* Audio only.
*
* Corresponds to nBlockAlign in WAVEFORMATEX.
*/
int block_align;
/**
* Audio frame size, if known. Required by some formats to be static.
*
* Audio only.
*/
int frame_size;
/**
* Number of padding audio samples at the start.
*
* The amount of padding (in samples) inserted by the encoder at
* the beginning of the audio. I.e. this number of leading decoded samples
* must be discarded to get the original audio without leading
* padding.
*
* Audio only.
*/
int initial_padding;
/**
* Number of padding audio samples at the end.
*
* The amount of padding (in samples) appended by the encoder to
* the end of the audio. I.e. this number of decoded samples must be
* discarded from the end of the stream to get the original
* audio without any trailing padding.
*
* Audio only.
*/
int trailing_padding;
/**
* Number of audio samples to skip after a discontinuity.
*
* Audio only.
*/
int seek_preroll;
/**
* Video with alpha channel only. Alpha channel handling
*/
enum AVAlphaMode alpha_mode;
} AVCodecParameters;
/**
* @relates AVCodecParameters
* @{
*/
/**
* Allocate a new AVCodecParameters and set its fields to default values
* (unknown/invalid/0). The returned struct must be freed with
* ::avcodec_parameters_free().
*/
AVCodecParameters *avcodec_parameters_alloc(void);
/**
* Free an AVCodecParameters instance and everything associated with it and
* write `NULL` to the supplied pointer.
*/
void avcodec_parameters_free(AVCodecParameters **par);
/**
* Copy the contents of \p src to \p dst. Any allocated fields in dst are freed and
* replaced with newly allocated duplicates of the corresponding fields in src.
*
* @return >= 0 on success, a negative AVERROR code on failure.
*/
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
/**
* This function is the same as ::av_get_audio_frame_duration(), except it works
* with ::AVCodecParameters instead of an ::AVCodecContext.
*/
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
/** @} */
/**
* @}
*/
#endif // AVCODEC_CODEC_PAR_H