FFmpeg
rawenc.c
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1 /*
2  * RAW muxers
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2005 Alex Beregszaszi
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/intreadwrite.h"
24 
25 #include "avformat.h"
26 #include "rawenc.h"
27 #include "internal.h"
28 
30 {
31  avio_write(s->pb, pkt->data, pkt->size);
32  return 0;
33 }
34 
36 {
37  if (s->nb_streams != 1) {
38  av_log(s, AV_LOG_ERROR, "%s files have exactly one stream\n",
39  s->oformat->name);
40  return AVERROR(EINVAL);
41  }
44  av_log(s, AV_LOG_ERROR, "%s files have exactly one audio stream\n",
45  s->oformat->name);
46  return AVERROR(EINVAL);
47  }
50  av_log(s, AV_LOG_ERROR, "%s files have exactly one video stream\n",
51  s->oformat->name);
52  return AVERROR(EINVAL);
53  }
54  return 0;
55 }
56 
57 /* Note: Do not forget to add new entries to the Makefile as well. */
58 
59 #if CONFIG_AC3_MUXER
61  .name = "ac3",
62  .long_name = NULL_IF_CONFIG_SMALL("raw AC-3"),
63  .mime_type = "audio/x-ac3",
64  .extensions = "ac3",
65  .audio_codec = AV_CODEC_ID_AC3,
66  .video_codec = AV_CODEC_ID_NONE,
67  .write_header = force_one_stream,
68  .write_packet = ff_raw_write_packet,
69  .flags = AVFMT_NOTIMESTAMPS,
70 };
71 #endif
72 
73 #if CONFIG_ADX_MUXER
74 
75 static int adx_write_trailer(AVFormatContext *s)
76 {
77  AVIOContext *pb = s->pb;
78  AVCodecParameters *par = s->streams[0]->codecpar;
79 
80  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
81  int64_t file_size = avio_tell(pb);
82  uint64_t sample_count = (file_size - 36) / par->channels / 18 * 32;
83  if (sample_count <= UINT32_MAX) {
84  avio_seek(pb, 12, SEEK_SET);
85  avio_wb32(pb, sample_count);
86  avio_seek(pb, file_size, SEEK_SET);
87  }
88  }
89 
90  return 0;
91 }
92 
94  .name = "adx",
95  .long_name = NULL_IF_CONFIG_SMALL("CRI ADX"),
96  .extensions = "adx",
97  .audio_codec = AV_CODEC_ID_ADPCM_ADX,
98  .video_codec = AV_CODEC_ID_NONE,
99  .write_header = force_one_stream,
100  .write_packet = ff_raw_write_packet,
101  .write_trailer = adx_write_trailer,
102  .flags = AVFMT_NOTIMESTAMPS,
103 };
104 #endif
105 
106 #if CONFIG_APTX_MUXER
108  .name = "aptx",
109  .long_name = NULL_IF_CONFIG_SMALL("raw aptX (Audio Processing Technology for Bluetooth)"),
110  .extensions = "aptx",
111  .audio_codec = AV_CODEC_ID_APTX,
112  .video_codec = AV_CODEC_ID_NONE,
113  .write_header = force_one_stream,
114  .write_packet = ff_raw_write_packet,
115  .flags = AVFMT_NOTIMESTAMPS,
116 };
117 #endif
118 
119 #if CONFIG_APTX_HD_MUXER
121  .name = "aptx_hd",
122  .long_name = NULL_IF_CONFIG_SMALL("raw aptX HD (Audio Processing Technology for Bluetooth)"),
123  .extensions = "aptxhd",
124  .audio_codec = AV_CODEC_ID_APTX_HD,
125  .video_codec = AV_CODEC_ID_NONE,
126  .write_header = force_one_stream,
127  .write_packet = ff_raw_write_packet,
128  .flags = AVFMT_NOTIMESTAMPS,
129 };
130 #endif
131 
132 #if CONFIG_AVS2_MUXER
134  .name = "avs2",
135  .long_name = NULL_IF_CONFIG_SMALL("raw AVS2-P2/IEEE1857.4 video"),
136  .extensions = "avs,avs2",
137  .audio_codec = AV_CODEC_ID_NONE,
138  .video_codec = AV_CODEC_ID_AVS2,
139  .write_header = force_one_stream,
140  .write_packet = ff_raw_write_packet,
141  .flags = AVFMT_NOTIMESTAMPS,
142 };
143 #endif
144 
145 #if CONFIG_CAVSVIDEO_MUXER
147  .name = "cavsvideo",
148  .long_name = NULL_IF_CONFIG_SMALL("raw Chinese AVS (Audio Video Standard) video"),
149  .extensions = "cavs",
150  .audio_codec = AV_CODEC_ID_NONE,
151  .video_codec = AV_CODEC_ID_CAVS,
152  .write_header = force_one_stream,
153  .write_packet = ff_raw_write_packet,
154  .flags = AVFMT_NOTIMESTAMPS,
155 };
156 #endif
157 
158 #if CONFIG_CODEC2RAW_MUXER
160  .name = "codec2raw",
161  .long_name = NULL_IF_CONFIG_SMALL("raw codec2 muxer"),
162  .audio_codec = AV_CODEC_ID_CODEC2,
163  .video_codec = AV_CODEC_ID_NONE,
164  .write_header = force_one_stream,
165  .write_packet = ff_raw_write_packet,
166  .flags = AVFMT_NOTIMESTAMPS,
167 };
168 #endif
169 
170 
171 #if CONFIG_DATA_MUXER
173  .name = "data",
174  .long_name = NULL_IF_CONFIG_SMALL("raw data"),
175  .write_header = force_one_stream,
176  .write_packet = ff_raw_write_packet,
177  .flags = AVFMT_NOTIMESTAMPS,
178 };
179 #endif
180 
181 #if CONFIG_DIRAC_MUXER
183  .name = "dirac",
184  .long_name = NULL_IF_CONFIG_SMALL("raw Dirac"),
185  .extensions = "drc,vc2",
186  .audio_codec = AV_CODEC_ID_NONE,
187  .video_codec = AV_CODEC_ID_DIRAC,
188  .write_header = force_one_stream,
189  .write_packet = ff_raw_write_packet,
190  .flags = AVFMT_NOTIMESTAMPS,
191 };
192 #endif
193 
194 #if CONFIG_DNXHD_MUXER
196  .name = "dnxhd",
197  .long_name = NULL_IF_CONFIG_SMALL("raw DNxHD (SMPTE VC-3)"),
198  .extensions = "dnxhd,dnxhr",
199  .audio_codec = AV_CODEC_ID_NONE,
200  .video_codec = AV_CODEC_ID_DNXHD,
201  .write_header = force_one_stream,
202  .write_packet = ff_raw_write_packet,
203  .flags = AVFMT_NOTIMESTAMPS,
204 };
205 #endif
206 
207 #if CONFIG_DTS_MUXER
209  .name = "dts",
210  .long_name = NULL_IF_CONFIG_SMALL("raw DTS"),
211  .mime_type = "audio/x-dca",
212  .extensions = "dts",
213  .audio_codec = AV_CODEC_ID_DTS,
214  .video_codec = AV_CODEC_ID_NONE,
215  .write_header = force_one_stream,
216  .write_packet = ff_raw_write_packet,
217  .flags = AVFMT_NOTIMESTAMPS,
218 };
219 #endif
220 
221 #if CONFIG_EAC3_MUXER
223  .name = "eac3",
224  .long_name = NULL_IF_CONFIG_SMALL("raw E-AC-3"),
225  .mime_type = "audio/x-eac3",
226  .extensions = "eac3",
227  .audio_codec = AV_CODEC_ID_EAC3,
228  .video_codec = AV_CODEC_ID_NONE,
229  .write_header = force_one_stream,
230  .write_packet = ff_raw_write_packet,
231  .flags = AVFMT_NOTIMESTAMPS,
232 };
233 #endif
234 
235 #if CONFIG_G722_MUXER
237  .name = "g722",
238  .long_name = NULL_IF_CONFIG_SMALL("raw G.722"),
239  .mime_type = "audio/G722",
240  .extensions = "g722",
241  .audio_codec = AV_CODEC_ID_ADPCM_G722,
242  .video_codec = AV_CODEC_ID_NONE,
243  .write_header = force_one_stream,
244  .write_packet = ff_raw_write_packet,
245  .flags = AVFMT_NOTIMESTAMPS,
246 };
247 #endif
248 
249 #if CONFIG_G723_1_MUXER
251  .name = "g723_1",
252  .long_name = NULL_IF_CONFIG_SMALL("raw G.723.1"),
253  .mime_type = "audio/g723",
254  .extensions = "tco,rco",
255  .audio_codec = AV_CODEC_ID_G723_1,
256  .video_codec = AV_CODEC_ID_NONE,
257  .write_header = force_one_stream,
258  .write_packet = ff_raw_write_packet,
259  .flags = AVFMT_NOTIMESTAMPS,
260 };
261 #endif
262 
263 #if CONFIG_G726_MUXER
265  .name = "g726",
266  .long_name = NULL_IF_CONFIG_SMALL("raw big-endian G.726 (\"left-justified\")"),
267  .audio_codec = AV_CODEC_ID_ADPCM_G726,
268  .video_codec = AV_CODEC_ID_NONE,
269  .write_header = force_one_stream,
270  .write_packet = ff_raw_write_packet,
271  .flags = AVFMT_NOTIMESTAMPS,
272 };
273 #endif
274 
275 #if CONFIG_G726LE_MUXER
277  .name = "g726le",
278  .long_name = NULL_IF_CONFIG_SMALL("raw little-endian G.726 (\"right-justified\")"),
279  .audio_codec = AV_CODEC_ID_ADPCM_G726LE,
280  .video_codec = AV_CODEC_ID_NONE,
281  .write_header = force_one_stream,
282  .write_packet = ff_raw_write_packet,
283  .flags = AVFMT_NOTIMESTAMPS,
284 };
285 #endif
286 
287 #if CONFIG_GSM_MUXER
289  .name = "gsm",
290  .long_name = NULL_IF_CONFIG_SMALL("raw GSM"),
291  .mime_type = "audio/x-gsm",
292  .extensions = "gsm",
293  .audio_codec = AV_CODEC_ID_GSM,
294  .video_codec = AV_CODEC_ID_NONE,
295  .write_header = force_one_stream,
296  .write_packet = ff_raw_write_packet,
297  .flags = AVFMT_NOTIMESTAMPS,
298 };
299 #endif
300 
301 #if CONFIG_H261_MUXER
303  .name = "h261",
304  .long_name = NULL_IF_CONFIG_SMALL("raw H.261"),
305  .mime_type = "video/x-h261",
306  .extensions = "h261",
307  .audio_codec = AV_CODEC_ID_NONE,
308  .video_codec = AV_CODEC_ID_H261,
309  .write_header = force_one_stream,
310  .write_packet = ff_raw_write_packet,
311  .flags = AVFMT_NOTIMESTAMPS,
312 };
313 #endif
314 
315 #if CONFIG_H263_MUXER
317  .name = "h263",
318  .long_name = NULL_IF_CONFIG_SMALL("raw H.263"),
319  .mime_type = "video/x-h263",
320  .extensions = "h263",
321  .audio_codec = AV_CODEC_ID_NONE,
322  .video_codec = AV_CODEC_ID_H263,
323  .write_header = force_one_stream,
324  .write_packet = ff_raw_write_packet,
325  .flags = AVFMT_NOTIMESTAMPS,
326 };
327 #endif
328 
329 #if CONFIG_H264_MUXER
330 static int h264_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
331 {
332  AVStream *st = s->streams[0];
333  if (pkt->size >= 5 && AV_RB32(pkt->data) != 0x0000001 &&
334  AV_RB24(pkt->data) != 0x000001)
335  return ff_stream_add_bitstream_filter(st, "h264_mp4toannexb", NULL);
336  return 1;
337 }
338 
340  .name = "h264",
341  .long_name = NULL_IF_CONFIG_SMALL("raw H.264 video"),
342  .extensions = "h264,264",
343  .audio_codec = AV_CODEC_ID_NONE,
344  .video_codec = AV_CODEC_ID_H264,
345  .write_header = force_one_stream,
346  .write_packet = ff_raw_write_packet,
347  .check_bitstream = h264_check_bitstream,
348  .flags = AVFMT_NOTIMESTAMPS,
349 };
350 #endif
351 
352 #if CONFIG_HEVC_MUXER
353 static int hevc_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
354 {
355  AVStream *st = s->streams[0];
356  if (pkt->size >= 5 && AV_RB32(pkt->data) != 0x0000001 &&
357  AV_RB24(pkt->data) != 0x000001)
358  return ff_stream_add_bitstream_filter(st, "hevc_mp4toannexb", NULL);
359  return 1;
360 }
361 
363  .name = "hevc",
364  .long_name = NULL_IF_CONFIG_SMALL("raw HEVC video"),
365  .extensions = "hevc,h265,265",
366  .audio_codec = AV_CODEC_ID_NONE,
367  .video_codec = AV_CODEC_ID_HEVC,
368  .write_header = force_one_stream,
369  .write_packet = ff_raw_write_packet,
370  .check_bitstream = hevc_check_bitstream,
371  .flags = AVFMT_NOTIMESTAMPS,
372 };
373 #endif
374 
375 #if CONFIG_M4V_MUXER
377  .name = "m4v",
378  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-4 video"),
379  .extensions = "m4v",
380  .audio_codec = AV_CODEC_ID_NONE,
381  .video_codec = AV_CODEC_ID_MPEG4,
382  .write_header = force_one_stream,
383  .write_packet = ff_raw_write_packet,
384  .flags = AVFMT_NOTIMESTAMPS,
385 };
386 #endif
387 
388 #if CONFIG_MJPEG_MUXER
390  .name = "mjpeg",
391  .long_name = NULL_IF_CONFIG_SMALL("raw MJPEG video"),
392  .mime_type = "video/x-mjpeg",
393  .extensions = "mjpg,mjpeg",
394  .audio_codec = AV_CODEC_ID_NONE,
395  .video_codec = AV_CODEC_ID_MJPEG,
396  .write_header = force_one_stream,
397  .write_packet = ff_raw_write_packet,
398  .flags = AVFMT_NOTIMESTAMPS,
399 };
400 #endif
401 
402 #if CONFIG_SINGLEJPEG_MUXER
404  .name = "singlejpeg",
405  .long_name = NULL_IF_CONFIG_SMALL("JPEG single image"),
406  .mime_type = "image/jpeg",
407  .audio_codec = AV_CODEC_ID_NONE,
408  .video_codec = AV_CODEC_ID_MJPEG,
409  .write_packet = ff_raw_write_packet,
410  .flags = AVFMT_NOTIMESTAMPS,
411  .write_header = force_one_stream,
412 };
413 #endif
414 
415 #if CONFIG_MLP_MUXER
417  .name = "mlp",
418  .long_name = NULL_IF_CONFIG_SMALL("raw MLP"),
419  .extensions = "mlp",
420  .audio_codec = AV_CODEC_ID_MLP,
421  .video_codec = AV_CODEC_ID_NONE,
422  .write_header = force_one_stream,
423  .write_packet = ff_raw_write_packet,
424  .flags = AVFMT_NOTIMESTAMPS,
425 };
426 #endif
427 
428 #if CONFIG_MP2_MUXER
430  .name = "mp2",
431  .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
432  .mime_type = "audio/mpeg",
433  .extensions = "mp2,m2a,mpa",
434  .audio_codec = AV_CODEC_ID_MP2,
435  .video_codec = AV_CODEC_ID_NONE,
436  .write_packet = ff_raw_write_packet,
437  .flags = AVFMT_NOTIMESTAMPS,
438 };
439 #endif
440 
441 #if CONFIG_MPEG1VIDEO_MUXER
443  .name = "mpeg1video",
444  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-1 video"),
445  .mime_type = "video/mpeg",
446  .extensions = "mpg,mpeg,m1v",
447  .audio_codec = AV_CODEC_ID_NONE,
448  .video_codec = AV_CODEC_ID_MPEG1VIDEO,
449  .write_header = force_one_stream,
450  .write_packet = ff_raw_write_packet,
451  .flags = AVFMT_NOTIMESTAMPS,
452 };
453 #endif
454 
455 #if CONFIG_MPEG2VIDEO_MUXER
457  .name = "mpeg2video",
458  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-2 video"),
459  .extensions = "m2v",
460  .audio_codec = AV_CODEC_ID_NONE,
461  .video_codec = AV_CODEC_ID_MPEG2VIDEO,
462  .write_header = force_one_stream,
463  .write_packet = ff_raw_write_packet,
464  .flags = AVFMT_NOTIMESTAMPS,
465 };
466 #endif
467 
468 #if CONFIG_RAWVIDEO_MUXER
470  .name = "rawvideo",
471  .long_name = NULL_IF_CONFIG_SMALL("raw video"),
472  .extensions = "yuv,rgb",
473  .audio_codec = AV_CODEC_ID_NONE,
474  .video_codec = AV_CODEC_ID_RAWVIDEO,
475  .write_packet = ff_raw_write_packet,
476  .flags = AVFMT_NOTIMESTAMPS,
477 };
478 #endif
479 
480 #if CONFIG_SBC_MUXER
482  .name = "sbc",
483  .long_name = NULL_IF_CONFIG_SMALL("raw SBC"),
484  .mime_type = "audio/x-sbc",
485  .extensions = "sbc,msbc",
486  .audio_codec = AV_CODEC_ID_SBC,
487  .write_header = force_one_stream,
488  .write_packet = ff_raw_write_packet,
489  .flags = AVFMT_NOTIMESTAMPS,
490 };
491 #endif
492 
493 #if CONFIG_TRUEHD_MUXER
495  .name = "truehd",
496  .long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"),
497  .extensions = "thd",
498  .audio_codec = AV_CODEC_ID_TRUEHD,
499  .video_codec = AV_CODEC_ID_NONE,
500  .write_header = force_one_stream,
501  .write_packet = ff_raw_write_packet,
502  .flags = AVFMT_NOTIMESTAMPS,
503 };
504 #endif
505 
506 #if CONFIG_VC1_MUXER
508  .name = "vc1",
509  .long_name = NULL_IF_CONFIG_SMALL("raw VC-1 video"),
510  .extensions = "vc1",
511  .audio_codec = AV_CODEC_ID_NONE,
512  .video_codec = AV_CODEC_ID_VC1,
513  .write_header = force_one_stream,
514  .write_packet = ff_raw_write_packet,
515  .flags = AVFMT_NOTIMESTAMPS,
516 };
517 #endif
AVOutputFormat ff_m4v_muxer
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
AVOutputFormat ff_g726_muxer
static int force_one_stream(AVFormatContext *s)
Definition: rawenc.c:35
enum AVCodecID video_codec
default video codec
Definition: avformat.h:516
int size
Definition: avcodec.h:1481
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVOutputFormat ff_mpeg1video_muxer
AVOutputFormat ff_avs2_muxer
AVOutputFormat ff_mp2_muxer
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3960
AVOutputFormat ff_data_muxer
AVOutputFormat ff_dirac_muxer
Format I/O context.
Definition: avformat.h:1358
AVOutputFormat ff_eac3_muxer
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
AVOutputFormat ff_g722_muxer
uint8_t * data
Definition: avcodec.h:1480
AVOutputFormat ff_adx_muxer
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
#define av_log(a,...)
AVOutputFormat ff_h261_muxer
AVOutputFormat ff_hevc_muxer
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
AVOutputFormat ff_h264_muxer
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
AVOutputFormat ff_aptx_muxer
AVOutputFormat ff_sbc_muxer
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
AVOutputFormat ff_rawvideo_muxer
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
AVOutputFormat ff_g723_1_muxer
AVOutputFormat ff_gsm_muxer
const char * name
Definition: avformat.h:505
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:220
ff_const59 struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1377
if(ret)
Stream structure.
Definition: avformat.h:881
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:467
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
AVOutputFormat ff_truehd_muxer
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:87
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
AVOutputFormat ff_mjpeg_muxer
AVOutputFormat ff_h263_muxer
AVOutputFormat ff_mpeg2video_muxer
AVOutputFormat ff_dts_muxer
AVOutputFormat ff_aptx_hd_muxer
AVOutputFormat ff_singlejpeg_muxer
AVOutputFormat ff_g726le_muxer
AVOutputFormat ff_vc1_muxer
AVOutputFormat ff_cavsvideo_muxer
Main libavformat public API header.
AVOutputFormat ff_ac3_muxer
as in Berlin toast format
Definition: avcodec.h:583
enum AVCodecID audio_codec
default audio codec
Definition: avformat.h:515
int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args)
Add a bitstream filter to a stream.
Definition: utils.c:5556
int channels
Audio only.
Definition: avcodec.h:4074
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:380
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
AVOutputFormat ff_mlp_muxer
This structure stores compressed data.
Definition: avcodec.h:1457
AVOutputFormat ff_codec2raw_muxer
AVOutputFormat ff_dnxhd_muxer