mirror of https://github.com/FFmpeg/FFmpeg.git
Anton Khirnov
5 years ago
parent
f30a41a608
commit
9d443c3e68
5 changed files with 236 additions and 190 deletions
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/*
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* Codec parameters public API |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_CODEC_PAR_H |
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#define AVCODEC_CODEC_PAR_H |
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#include <stdint.h> |
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#include "libavutil/avutil.h" |
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#include "libavutil/rational.h" |
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#include "libavutil/pixfmt.h" |
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#include "codec_id.h" |
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/**
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* @addtogroup lavc_core |
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*/ |
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enum AVFieldOrder { |
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AV_FIELD_UNKNOWN, |
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AV_FIELD_PROGRESSIVE, |
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AV_FIELD_TT, //< Top coded_first, top displayed first
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AV_FIELD_BB, //< Bottom coded first, bottom displayed first
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AV_FIELD_TB, //< Top coded first, bottom displayed first
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AV_FIELD_BT, //< Bottom coded first, top displayed first
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}; |
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/**
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* This struct describes the properties of an encoded stream. |
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* |
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* sizeof(AVCodecParameters) is not a part of the public ABI, this struct must |
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* be allocated with avcodec_parameters_alloc() and freed with |
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* avcodec_parameters_free(). |
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*/ |
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typedef struct AVCodecParameters { |
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/**
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* General type of the encoded data. |
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*/ |
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enum AVMediaType codec_type; |
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/**
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* Specific type of the encoded data (the codec used). |
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*/ |
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enum AVCodecID codec_id; |
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/**
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* Additional information about the codec (corresponds to the AVI FOURCC). |
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*/ |
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uint32_t codec_tag; |
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/**
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* Extra binary data needed for initializing the decoder, codec-dependent. |
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* |
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* Must be allocated with av_malloc() and will be freed by |
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* avcodec_parameters_free(). The allocated size of extradata must be at |
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* least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding |
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* bytes zeroed. |
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*/ |
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uint8_t *extradata; |
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/**
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* Size of the extradata content in bytes. |
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*/ |
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int extradata_size; |
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/**
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* - video: the pixel format, the value corresponds to enum AVPixelFormat. |
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* - audio: the sample format, the value corresponds to enum AVSampleFormat. |
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*/ |
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int format; |
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/**
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* The average bitrate of the encoded data (in bits per second). |
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*/ |
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int64_t bit_rate; |
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/**
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* The number of bits per sample in the codedwords. |
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* |
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* This is basically the bitrate per sample. It is mandatory for a bunch of |
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* formats to actually decode them. It's the number of bits for one sample in |
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* the actual coded bitstream. |
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* |
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* This could be for example 4 for ADPCM |
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* For PCM formats this matches bits_per_raw_sample |
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* Can be 0 |
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*/ |
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int bits_per_coded_sample; |
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/**
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* This is the number of valid bits in each output sample. If the |
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* sample format has more bits, the least significant bits are additional |
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* padding bits, which are always 0. Use right shifts to reduce the sample |
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* to its actual size. For example, audio formats with 24 bit samples will |
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* have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32. |
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* To get the original sample use "(int32_t)sample >> 8"." |
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* |
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* For ADPCM this might be 12 or 16 or similar |
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* Can be 0 |
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*/ |
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int bits_per_raw_sample; |
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/**
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* Codec-specific bitstream restrictions that the stream conforms to. |
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*/ |
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int profile; |
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int level; |
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/**
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* Video only. The dimensions of the video frame in pixels. |
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*/ |
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int width; |
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int height; |
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/**
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* Video only. The aspect ratio (width / height) which a single pixel |
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* should have when displayed. |
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* |
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* When the aspect ratio is unknown / undefined, the numerator should be |
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* set to 0 (the denominator may have any value). |
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*/ |
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AVRational sample_aspect_ratio; |
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/**
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* Video only. The order of the fields in interlaced video. |
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*/ |
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enum AVFieldOrder field_order; |
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/**
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* Video only. Additional colorspace characteristics. |
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*/ |
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enum AVColorRange color_range; |
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enum AVColorPrimaries color_primaries; |
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enum AVColorTransferCharacteristic color_trc; |
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enum AVColorSpace color_space; |
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enum AVChromaLocation chroma_location; |
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/**
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* Video only. Number of delayed frames. |
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*/ |
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int video_delay; |
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/**
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* Audio only. The channel layout bitmask. May be 0 if the channel layout is |
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* unknown or unspecified, otherwise the number of bits set must be equal to |
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* the channels field. |
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*/ |
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uint64_t channel_layout; |
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/**
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* Audio only. The number of audio channels. |
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*/ |
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int channels; |
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/**
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* Audio only. The number of audio samples per second. |
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*/ |
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int sample_rate; |
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/**
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* Audio only. The number of bytes per coded audio frame, required by some |
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* formats. |
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* |
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* Corresponds to nBlockAlign in WAVEFORMATEX. |
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*/ |
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int block_align; |
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/**
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* Audio only. Audio frame size, if known. Required by some formats to be static. |
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*/ |
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int frame_size; |
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/**
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* Audio only. The amount of padding (in samples) inserted by the encoder at |
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* the beginning of the audio. I.e. this number of leading decoded samples |
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* must be discarded by the caller to get the original audio without leading |
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* padding. |
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*/ |
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int initial_padding; |
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/**
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* Audio only. The amount of padding (in samples) appended by the encoder to |
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* the end of the audio. I.e. this number of decoded samples must be |
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* discarded by the caller from the end of the stream to get the original |
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* audio without any trailing padding. |
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*/ |
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int trailing_padding; |
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/**
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* Audio only. Number of samples to skip after a discontinuity. |
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*/ |
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int seek_preroll; |
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} AVCodecParameters; |
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/**
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* Allocate a new AVCodecParameters and set its fields to default values |
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* (unknown/invalid/0). The returned struct must be freed with |
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* avcodec_parameters_free(). |
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*/ |
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AVCodecParameters *avcodec_parameters_alloc(void); |
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/**
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* Free an AVCodecParameters instance and everything associated with it and |
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* write NULL to the supplied pointer. |
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*/ |
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void avcodec_parameters_free(AVCodecParameters **par); |
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/**
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* Copy the contents of src to dst. Any allocated fields in dst are freed and |
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* replaced with newly allocated duplicates of the corresponding fields in src. |
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* |
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* @return >= 0 on success, a negative AVERROR code on failure. |
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*/ |
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int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src); |
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/**
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* @} |
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*/ |
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#endif // AVCODEC_CODEC_PAR_H
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