FFmpeg 5.1.6
codec_par.h
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1/*
2 * Codec parameters public API
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVCODEC_CODEC_PAR_H
22#define AVCODEC_CODEC_PAR_H
23
24#include <stdint.h>
25
26#include "libavutil/avutil.h"
28#include "libavutil/rational.h"
29#include "libavutil/pixfmt.h"
30
31#include "codec_id.h"
32
33/**
34 * @addtogroup lavc_core
35 */
36
40 AV_FIELD_TT, //< Top coded_first, top displayed first
41 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
42 AV_FIELD_TB, //< Top coded first, bottom displayed first
43 AV_FIELD_BT, //< Bottom coded first, top displayed first
44};
45
46/**
47 * This struct describes the properties of an encoded stream.
48 *
49 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
50 * be allocated with avcodec_parameters_alloc() and freed with
51 * avcodec_parameters_free().
52 */
53typedef struct AVCodecParameters {
54 /**
55 * General type of the encoded data.
56 */
58 /**
59 * Specific type of the encoded data (the codec used).
60 */
62 /**
63 * Additional information about the codec (corresponds to the AVI FOURCC).
64 */
65 uint32_t codec_tag;
66
67 /**
68 * Extra binary data needed for initializing the decoder, codec-dependent.
69 *
70 * Must be allocated with av_malloc() and will be freed by
71 * avcodec_parameters_free(). The allocated size of extradata must be at
72 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
73 * bytes zeroed.
74 */
75 uint8_t *extradata;
76 /**
77 * Size of the extradata content in bytes.
78 */
80
81 /**
82 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
83 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
84 */
85 int format;
86
87 /**
88 * The average bitrate of the encoded data (in bits per second).
89 */
90 int64_t bit_rate;
91
92 /**
93 * The number of bits per sample in the codedwords.
94 *
95 * This is basically the bitrate per sample. It is mandatory for a bunch of
96 * formats to actually decode them. It's the number of bits for one sample in
97 * the actual coded bitstream.
98 *
99 * This could be for example 4 for ADPCM
100 * For PCM formats this matches bits_per_raw_sample
101 * Can be 0
102 */
104
105 /**
106 * This is the number of valid bits in each output sample. If the
107 * sample format has more bits, the least significant bits are additional
108 * padding bits, which are always 0. Use right shifts to reduce the sample
109 * to its actual size. For example, audio formats with 24 bit samples will
110 * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
111 * To get the original sample use "(int32_t)sample >> 8"."
112 *
113 * For ADPCM this might be 12 or 16 or similar
114 * Can be 0
115 */
117
118 /**
119 * Codec-specific bitstream restrictions that the stream conforms to.
120 */
122 int level;
123
124 /**
125 * Video only. The dimensions of the video frame in pixels.
126 */
127 int width;
129
130 /**
131 * Video only. The aspect ratio (width / height) which a single pixel
132 * should have when displayed.
133 *
134 * When the aspect ratio is unknown / undefined, the numerator should be
135 * set to 0 (the denominator may have any value).
136 */
138
139 /**
140 * Video only. The order of the fields in interlaced video.
141 */
143
144 /**
145 * Video only. Additional colorspace characteristics.
146 */
152
153 /**
154 * Video only. Number of delayed frames.
155 */
157
158#if FF_API_OLD_CHANNEL_LAYOUT
159 /**
160 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
161 * unknown or unspecified, otherwise the number of bits set must be equal to
162 * the channels field.
163 * @deprecated use ch_layout
164 */
166 uint64_t channel_layout;
167 /**
168 * Audio only. The number of audio channels.
169 * @deprecated use ch_layout.nb_channels
170 */
172 int channels;
173#endif
174 /**
175 * Audio only. The number of audio samples per second.
176 */
178 /**
179 * Audio only. The number of bytes per coded audio frame, required by some
180 * formats.
181 *
182 * Corresponds to nBlockAlign in WAVEFORMATEX.
183 */
185 /**
186 * Audio only. Audio frame size, if known. Required by some formats to be static.
187 */
189
190 /**
191 * Audio only. The amount of padding (in samples) inserted by the encoder at
192 * the beginning of the audio. I.e. this number of leading decoded samples
193 * must be discarded by the caller to get the original audio without leading
194 * padding.
195 */
197 /**
198 * Audio only. The amount of padding (in samples) appended by the encoder to
199 * the end of the audio. I.e. this number of decoded samples must be
200 * discarded by the caller from the end of the stream to get the original
201 * audio without any trailing padding.
202 */
204 /**
205 * Audio only. Number of samples to skip after a discontinuity.
206 */
208
209 /**
210 * Audio only. The channel layout and number of channels.
211 */
214
215/**
216 * Allocate a new AVCodecParameters and set its fields to default values
217 * (unknown/invalid/0). The returned struct must be freed with
218 * avcodec_parameters_free().
219 */
221
222/**
223 * Free an AVCodecParameters instance and everything associated with it and
224 * write NULL to the supplied pointer.
225 */
227
228/**
229 * Copy the contents of src to dst. Any allocated fields in dst are freed and
230 * replaced with newly allocated duplicates of the corresponding fields in src.
231 *
232 * @return >= 0 on success, a negative AVERROR code on failure.
233 */
235
236/**
237 * This function is the same as av_get_audio_frame_duration(), except it works
238 * with AVCodecParameters instead of an AVCodecContext.
239 */
241
242/**
243 * @}
244 */
245
246#endif // AVCODEC_CODEC_PAR_H
#define attribute_deprecated
Definition: attributes.h:100
Convenience header that includes libavutil's core.
audio channel layout utility functions
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
AVCodecParameters * avcodec_parameters_alloc(void)
Allocate a new AVCodecParameters and set its fields to default values (unknown/invalid/0).
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
void avcodec_parameters_free(AVCodecParameters **par)
Free an AVCodecParameters instance and everything associated with it and write NULL to the supplied p...
AVFieldOrder
Definition: codec_par.h:37
@ AV_FIELD_TT
Definition: codec_par.h:40
@ AV_FIELD_BB
Definition: codec_par.h:41
@ AV_FIELD_UNKNOWN
Definition: codec_par.h:38
@ AV_FIELD_PROGRESSIVE
Definition: codec_par.h:39
@ AV_FIELD_BT
Definition: codec_par.h:43
@ AV_FIELD_TB
Definition: codec_par.h:42
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
AVMediaType
Definition: avutil.h:199
pixel format definitions
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:618
AVColorRange
Visual content value range.
Definition: pixfmt.h:564
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:471
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:496
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:525
Utilties for rational number calculation.
An AVChannelLayout holds information about the channel layout of audio data.
This struct describes the properties of an encoded stream.
Definition: codec_par.h:53
enum AVColorSpace color_space
Definition: codec_par.h:150
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:79
int frame_size
Audio only.
Definition: codec_par.h:188
enum AVFieldOrder field_order
Video only.
Definition: codec_par.h:142
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:103
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
int width
Video only.
Definition: codec_par.h:127
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:90
int seek_preroll
Audio only.
Definition: codec_par.h:207
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
int trailing_padding
Audio only.
Definition: codec_par.h:203
int profile
Codec-specific bitstream restrictions that the stream conforms to.
Definition: codec_par.h:121
int block_align
Audio only.
Definition: codec_par.h:184
int bits_per_raw_sample
This is the number of valid bits in each output sample.
Definition: codec_par.h:116
AVRational sample_aspect_ratio
Video only.
Definition: codec_par.h:137
int video_delay
Video only.
Definition: codec_par.h:156
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:65
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:75
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
enum AVColorPrimaries color_primaries
Definition: codec_par.h:148
int sample_rate
Audio only.
Definition: codec_par.h:177
enum AVColorTransferCharacteristic color_trc
Definition: codec_par.h:149
int initial_padding
Audio only.
Definition: codec_par.h:196
enum AVChromaLocation chroma_location
Definition: codec_par.h:151
enum AVColorRange color_range
Video only.
Definition: codec_par.h:147
Rational number (pair of numerator and denominator).
Definition: rational.h:58