FFmpeg
options.c
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1 /*
2  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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 #include "avformat.h"
21 #include "avio_internal.h"
22 #include "demux.h"
23 #include "internal.h"
24 
25 #include "libavcodec/avcodec.h"
26 #include "libavcodec/codec_par.h"
27 
28 #include "libavutil/avassert.h"
29 #include "libavutil/iamf.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/intmath.h"
32 #include "libavutil/mem.h"
33 #include "libavutil/opt.h"
34 
35 /**
36  * @file
37  * Options definition for AVFormatContext.
38  */
39 
41 #include "options_table.h"
43 
44 static const char* format_to_name(void* ptr)
45 {
47  if(fc->iformat) return fc->iformat->name;
48  else if(fc->oformat) return fc->oformat->name;
49  else return fc->av_class->class_name;
50 }
51 
52 static void *format_child_next(void *obj, void *prev)
53 {
54  AVFormatContext *s = obj;
55  if (!prev && s->priv_data &&
56  ((s->iformat && s->iformat->priv_class) ||
57  s->oformat && s->oformat->priv_class))
58  return s->priv_data;
59  if (s->pb && s->pb->av_class && prev != s->pb)
60  return s->pb;
61  return NULL;
62 }
63 
64 enum {
69 
70 };
71 
72 #define ITER_STATE_SHIFT 16
73 
74 static const AVClass *format_child_class_iterate(void **iter)
75 {
76  // we use the low 16 bits of iter as the value to be passed to
77  // av_(de)muxer_iterate()
78  void *val = (void*)(((uintptr_t)*iter) & ((1 << ITER_STATE_SHIFT) - 1));
79  unsigned int state = ((uintptr_t)*iter) >> ITER_STATE_SHIFT;
80  const AVClass *ret = NULL;
81 
83  ret = &ff_avio_class;
84  state++;
85  goto finish;
86  }
87 
88  if (state == CHILD_CLASS_ITER_MUX) {
89  const AVOutputFormat *ofmt;
90 
91  while ((ofmt = av_muxer_iterate(&val))) {
92  ret = ofmt->priv_class;
93  if (ret)
94  goto finish;
95  }
96 
97  val = NULL;
98  state++;
99  }
100 
101  if (state == CHILD_CLASS_ITER_DEMUX) {
102  const AVInputFormat *ifmt;
103 
104  while ((ifmt = av_demuxer_iterate(&val))) {
105  ret = ifmt->priv_class;
106  if (ret)
107  goto finish;
108  }
109  val = NULL;
110  state++;
111  }
112 
113 finish:
114  // make sure none av_(de)muxer_iterate does not set the high bits of val
115  av_assert0(!((uintptr_t)val >> ITER_STATE_SHIFT));
116  *iter = (void*)((uintptr_t)val | (state << ITER_STATE_SHIFT));
117  return ret;
118 }
119 
120 static AVClassCategory get_category(void *ptr)
121 {
122  AVFormatContext* s = ptr;
123  if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
124  else return AV_CLASS_CATEGORY_MUXER;
125 }
126 
128  .class_name = "AVFormatContext",
129  .item_name = format_to_name,
130  .option = avformat_options,
131  .version = LIBAVUTIL_VERSION_INT,
132  .child_next = format_child_next,
133  .child_class_iterate = format_child_class_iterate,
135  .get_category = get_category,
136 };
137 
139  const char *url, int flags, AVDictionary **options)
140 {
141  int loglevel;
142 
143  if (!strcmp(url, s->url) ||
144  s->iformat && !strcmp(s->iformat->name, "image2") ||
145  s->oformat && !strcmp(s->oformat->name, "image2")
146  ) {
147  loglevel = AV_LOG_DEBUG;
148  } else
149  loglevel = AV_LOG_INFO;
150 
151  av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
152 
153  return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
154 }
155 
157 {
158  return avio_close(pb);
159 }
160 
162 {
163  FFFormatContext *const si = av_mallocz(sizeof(*si));
165 
166  if (!si)
167  return NULL;
168 
169  s = &si->pub;
170  s->av_class = &av_format_context_class;
171  s->io_open = io_open_default;
172  s->io_close2= io_close2_default;
173 
175 
176  si->pkt = av_packet_alloc();
177  si->parse_pkt = av_packet_alloc();
178  if (!si->pkt || !si->parse_pkt) {
180  return NULL;
181  }
182 
183 #if FF_API_LAVF_SHORTEST
184  si->shortest_end = AV_NOPTS_VALUE;
185 #endif
186 
187  return s;
188 }
189 
190 #if FF_API_GET_DUR_ESTIMATE_METHOD
191 enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
192 {
194 }
195 #endif
196 
198 {
199  return &av_format_context_class;
200 }
201 
202 #define DISPOSITION_OPT(ctx) \
203  { "disposition", NULL, offsetof(ctx, disposition), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, \
204  .flags = AV_OPT_FLAG_ENCODING_PARAM, .unit = "disposition" }, \
205  { "default", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEFAULT }, .unit = "disposition" }, \
206  { "dub", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DUB }, .unit = "disposition" }, \
207  { "original", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ORIGINAL }, .unit = "disposition" }, \
208  { "comment", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_COMMENT }, .unit = "disposition" }, \
209  { "lyrics", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_LYRICS }, .unit = "disposition" }, \
210  { "karaoke", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_KARAOKE }, .unit = "disposition" }, \
211  { "forced", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_FORCED }, .unit = "disposition" }, \
212  { "hearing_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_HEARING_IMPAIRED }, .unit = "disposition" }, \
213  { "visual_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_VISUAL_IMPAIRED }, .unit = "disposition" }, \
214  { "clean_effects", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CLEAN_EFFECTS }, .unit = "disposition" }, \
215  { "attached_pic", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ATTACHED_PIC }, .unit = "disposition" }, \
216  { "timed_thumbnails", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_TIMED_THUMBNAILS }, .unit = "disposition" }, \
217  { "non_diegetic", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_NON_DIEGETIC }, .unit = "disposition" }, \
218  { "captions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CAPTIONS }, .unit = "disposition" }, \
219  { "descriptions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DESCRIPTIONS }, .unit = "disposition" }, \
220  { "metadata", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_METADATA }, .unit = "disposition" }, \
221  { "dependent", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEPENDENT }, .unit = "disposition" }, \
222  { "still_image", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_STILL_IMAGE }, .unit = "disposition" }
223 
224 static const AVOption stream_options[] = {
226  { "discard", NULL, offsetof(AVStream, discard), AV_OPT_TYPE_INT, { .i64 = AVDISCARD_DEFAULT }, INT_MIN, INT_MAX,
227  .flags = AV_OPT_FLAG_DECODING_PARAM, .unit = "avdiscard" },
228  { "none", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONE }, .unit = "avdiscard" },
229  { "default", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_DEFAULT }, .unit = "avdiscard" },
230  { "noref", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONREF }, .unit = "avdiscard" },
231  { "bidir", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_BIDIR }, .unit = "avdiscard" },
232  { "nointra", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONINTRA }, .unit = "avdiscard" },
233  { "nokey", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONKEY }, .unit = "avdiscard" },
234  { "all", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_ALL }, .unit = "avdiscard" },
235  { NULL }
236 };
237 
238 static const AVClass stream_class = {
239  .class_name = "AVStream",
240  .item_name = av_default_item_name,
241  .version = LIBAVUTIL_VERSION_INT,
242  .option = stream_options,
243 };
244 
246 {
247  return &stream_class;
248 }
249 
251 {
252  FFFormatContext *const si = ffformatcontext(s);
253  FFStream *sti;
254  AVStream *st;
255  AVStream **streams;
256 
257  if (s->nb_streams >= s->max_streams) {
258  av_log(s, AV_LOG_ERROR, "Number of streams exceeds max_streams parameter"
259  " (%d), see the documentation if you wish to increase it\n",
260  s->max_streams);
261  return NULL;
262  }
263  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
264  if (!streams)
265  return NULL;
266  s->streams = streams;
267 
268  sti = av_mallocz(sizeof(*sti));
269  if (!sti)
270  return NULL;
271  st = &sti->pub;
272 
273  st->av_class = &stream_class;
275  if (!st->codecpar)
276  goto fail;
277 
278  sti->fmtctx = s;
279 
280  if (s->iformat) {
282  if (!sti->avctx)
283  goto fail;
284 
285  sti->info = av_mallocz(sizeof(*sti->info));
286  if (!sti->info)
287  goto fail;
288 
289 #if FF_API_R_FRAME_RATE
290  sti->info->last_dts = AV_NOPTS_VALUE;
291 #endif
294 
295  /* default pts setting is MPEG-like */
296  avpriv_set_pts_info(st, 33, 1, 90000);
297  /* we set the current DTS to 0 so that formats without any timestamps
298  * but durations get some timestamps, formats with some unknown
299  * timestamps have their first few packets buffered and the
300  * timestamps corrected before they are returned to the user */
301  sti->cur_dts = RELATIVE_TS_BASE;
302  } else {
303  sti->cur_dts = AV_NOPTS_VALUE;
304  }
305 
306  st->index = s->nb_streams;
308  st->duration = AV_NOPTS_VALUE;
309  sti->first_dts = AV_NOPTS_VALUE;
310  sti->probe_packets = s->max_probe_packets;
313 
316  for (int i = 0; i < MAX_REORDER_DELAY + 1; i++)
317  sti->pts_buffer[i] = AV_NOPTS_VALUE;
318 
319  st->sample_aspect_ratio = (AVRational) { 0, 1 };
320  sti->transferred_mux_tb = (AVRational) { 0, 1 };;
321 
322 #if FF_API_AVSTREAM_SIDE_DATA
323  sti->inject_global_side_data = si->inject_global_side_data;
324 #endif
325 
326  sti->need_context_update = 1;
327 
328  s->streams[s->nb_streams++] = st;
329  return st;
330 fail:
331  ff_free_stream(&st);
332  return NULL;
333 }
334 
335 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
336 #define OFFSET(x) offsetof(AVStreamGroupTileGrid, x)
337 static const AVOption tile_grid_options[] = {
338  { "grid_size", "size of the output canvas", OFFSET(coded_width),
339  AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, INT_MAX, FLAGS },
340  { "output_size", "size of valid pixels in output image meant for presentation", OFFSET(width),
341  AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, INT_MAX, FLAGS },
342  { "background_color", "set a background color for unused pixels",
343  OFFSET(background), AV_OPT_TYPE_COLOR, { .str = "black"}, 0, 0, FLAGS },
344  { "horizontal_offset", NULL, OFFSET(horizontal_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
345  { "vertical_offset", NULL, OFFSET(vertical_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
346  { NULL },
347 };
348 #undef FLAGS
349 #undef OFFSET
350 
351 static const AVClass tile_grid_class = {
352  .class_name = "AVStreamGroupTileGrid",
353  .version = LIBAVUTIL_VERSION_INT,
354  .option = tile_grid_options,
355 };
356 
357 static void *stream_group_child_next(void *obj, void *prev)
358 {
359  AVStreamGroup *stg = obj;
360  if (!prev) {
361  switch(stg->type) {
363  return stg->params.iamf_audio_element;
365  return stg->params.iamf_mix_presentation;
367  return stg->params.tile_grid;
368  default:
369  break;
370  }
371  }
372  return NULL;
373 }
374 
375 static const AVClass *stream_group_child_iterate(void **opaque)
376 {
377  uintptr_t i = (uintptr_t)*opaque;
378  const AVClass *ret = NULL;
379 
380  switch(i) {
382  i++;
383  // fall-through
386  break;
389  break;
391  ret = &tile_grid_class;
392  break;
393  default:
394  break;
395  }
396 
397  if (ret)
398  *opaque = (void*)(i + 1);
399  return ret;
400 }
401 
402 static const AVOption stream_group_options[] = {
404  {"id", "Set group id", offsetof(AVStreamGroup, id), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM },
405  { NULL }
406 };
407 
408 static const AVClass stream_group_class = {
409  .class_name = "AVStreamGroup",
410  .item_name = av_default_item_name,
411  .version = LIBAVUTIL_VERSION_INT,
412  .option = stream_group_options,
413  .child_next = stream_group_child_next,
414  .child_class_iterate = stream_group_child_iterate,
415 };
416 
418 {
419  return &stream_group_class;
420 }
421 
425 {
426  AVStreamGroup **stream_groups;
427  AVStreamGroup *stg;
428  FFStreamGroup *stgi;
429 
430  stream_groups = av_realloc_array(s->stream_groups, s->nb_stream_groups + 1,
431  sizeof(*stream_groups));
432  if (!stream_groups)
433  return NULL;
434  s->stream_groups = stream_groups;
435 
436  stgi = av_mallocz(sizeof(*stgi));
437  if (!stgi)
438  return NULL;
439  stg = &stgi->pub;
440 
442  av_opt_set_defaults(stg);
443  stg->type = type;
444  switch (type) {
447  if (!stg->params.iamf_audio_element)
448  goto fail;
449  break;
452  if (!stg->params.iamf_mix_presentation)
453  goto fail;
454  break;
456  stg->params.tile_grid = av_mallocz(sizeof(*stg->params.tile_grid));
457  if (!stg->params.tile_grid)
458  goto fail;
461  break;
462  default:
463  goto fail;
464  }
465 
466  if (options) {
468  goto fail;
469  }
470 
471  stgi->fmtctx = s;
472  stg->index = s->nb_stream_groups;
473 
474  s->stream_groups[s->nb_stream_groups++] = stg;
475 
476  return stg;
477 fail:
478  ff_free_stream_group(&stg);
479  return NULL;
480 }
481 
483 {
484  AVStream **streams = av_realloc_array(stg->streams, stg->nb_streams + 1,
485  sizeof(*stg->streams));
486  if (!streams)
487  return AVERROR(ENOMEM);
488 
489  stg->streams = streams;
490  stg->streams[stg->nb_streams++] = st;
491 
492  return 0;
493 }
494 
496 {
497  const FFStreamGroup *stgi = cffstreamgroup(stg);
498  const FFStream *sti = cffstream(st);
499 
500  if (stgi->fmtctx != sti->fmtctx)
501  return AVERROR(EINVAL);
502 
503  for (int i = 0; i < stg->nb_streams; i++)
504  if (stg->streams[i]->index == st->index)
505  return AVERROR(EEXIST);
506 
507  return stream_group_add_stream(stg, st);
508 }
509 
510 static int option_is_disposition(const AVOption *opt)
511 {
512  return opt->type == AV_OPT_TYPE_CONST &&
513  opt->unit && !strcmp(opt->unit, "disposition");
514 }
515 
516 int av_disposition_from_string(const char *disp)
517 {
518  for (const AVOption *opt = stream_options; opt->name; opt++)
519  if (option_is_disposition(opt) && !strcmp(disp, opt->name))
520  return opt->default_val.i64;
521  return AVERROR(EINVAL);
522 }
523 
524 const char *av_disposition_to_string(int disposition)
525 {
526  int val;
527 
528  if (disposition <= 0)
529  return NULL;
530 
531  val = 1 << ff_ctz(disposition);
532  for (const AVOption *opt = stream_options; opt->name; opt++)
533  if (option_is_disposition(opt) && opt->default_val.i64 == val)
534  return opt->name;
535 
536  return NULL;
537 }
AV_OPT_SEARCH_CHILDREN
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:522
FFStreamInfo::fps_last_dts
int64_t fps_last_dts
Definition: demux.h:163
iamf.h
AVCodec
AVCodec.
Definition: codec.h:187
AVStreamGroupParamsType
AVStreamGroupParamsType
Definition: avformat.h:1080
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
ffio_open_whitelist
int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist)
Definition: avio.c:471
av_opt_set_defaults
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1640
AVERROR
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
opt.h
AVStreamGroup::tile_grid
struct AVStreamGroupTileGrid * tile_grid
Definition: avformat.h:1125
DISPOSITION_OPT
#define DISPOSITION_OPT(ctx)
Definition: options.c:202
ITER_STATE_SHIFT
#define ITER_STATE_SHIFT
Definition: options.c:72
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:409
ff_ctz
#define ff_ctz
Definition: intmath.h:107
stream_group_add_stream
static int stream_group_add_stream(AVStreamGroup *stg, AVStream *st)
Definition: options.c:482
FFStream::last_IP_pts
int64_t last_IP_pts
Definition: internal.h:377
ffformatcontext
static av_always_inline FFFormatContext * ffformatcontext(AVFormatContext *s)
Definition: internal.h:188
format_child_class_iterate
static const AVClass * format_child_class_iterate(void **iter)
Definition: options.c:74
FLAGS
#define FLAGS
Definition: options.c:335
avformat_get_class
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:197
AVOption
AVOption.
Definition: opt.h:346
AVFormatContext::duration_estimation_method
enum AVDurationEstimationMethod duration_estimation_method
The duration field can be estimated through various ways, and this field can be used to know how the ...
Definition: avformat.h:1686
fc
#define fc(width, name, range_min, range_max)
Definition: cbs_av1.c:464
AVDictionary
Definition: dict.c:34
cffstream
static const av_always_inline FFStream * cffstream(const AVStream *st)
Definition: internal.h:422
FFStream::last_dts_for_order_check
int64_t last_dts_for_order_check
Internal data to analyze DTS and detect faulty mpeg streams.
Definition: internal.h:352
av_disposition_to_string
const char * av_disposition_to_string(int disposition)
Definition: options.c:524
stream_group_class
static const AVClass stream_group_class
Definition: options.c:408
FFStream::transferred_mux_tb
AVRational transferred_mux_tb
Definition: internal.h:414
ff_free_stream_group
void ff_free_stream_group(AVStreamGroup **pstg)
Frees a stream group without modifying the corresponding AVFormatContext.
Definition: avformat.c:83
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:853
finish
static void finish(void)
Definition: movenc.c:373
AVStreamGroup::av_class
const AVClass * av_class
A class for AVOptions.
Definition: avformat.h:1094
fail
#define fail()
Definition: checkasm.h:179
FFStreamInfo::fps_first_dts
int64_t fps_first_dts
Those are used for average framerate estimation.
Definition: demux.h:161
CHILD_CLASS_ITER_AVIO
@ CHILD_CLASS_ITER_AVIO
Definition: options.c:65
FFStream::avctx
struct AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:221
AVDISCARD_NONE
@ AVDISCARD_NONE
discard nothing
Definition: defs.h:213
val
static double val(void *priv, double ch)
Definition: aeval.c:78
av_iamf_audio_element_alloc
AVIAMFAudioElement * av_iamf_audio_element_alloc(void)
Allocates a AVIAMFAudioElement, and initializes its fields with default values.
Definition: iamf.c:322
av_stream_group_get_class
const AVClass * av_stream_group_get_class(void)
Get the AVClass for AVStreamGroup.
Definition: options.c:417
AVStreamGroup::params
union AVStreamGroup::@305 params
Group type-specific parameters.
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:802
AV_PTS_WRAP_IGNORE
#define AV_PTS_WRAP_IGNORE
Options for behavior on timestamp wrap detection.
Definition: avformat.h:732
AVStreamGroupTileGrid::av_class
const AVClass * av_class
Definition: avformat.h:983
stream_group_child_next
static void * stream_group_child_next(void *obj, void *prev)
Definition: options.c:357
avassert.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:548
AV_STREAM_GROUP_PARAMS_IAMF_MIX_PRESENTATION
@ AV_STREAM_GROUP_PARAMS_IAMF_MIX_PRESENTATION
Definition: avformat.h:1083
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:149
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:198
FFStreamInfo::last_dts
int64_t last_dts
Definition: demux.h:140
av_realloc_array
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:217
RELATIVE_TS_BASE
#define RELATIVE_TS_BASE
Definition: demux.h:173
FFStreamGroup::fmtctx
AVFormatContext * fmtctx
Definition: internal.h:433
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:236
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
AVIO_FLAG_WRITE
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:618
AVStreamGroup::index
unsigned int index
Group index in AVFormatContext.
Definition: avformat.h:1101
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
ctx
AVFormatContext * ctx
Definition: movenc.c:49
CHILD_CLASS_ITER_DEMUX
@ CHILD_CLASS_ITER_DEMUX
Definition: options.c:67
AVDISCARD_BIDIR
@ AVDISCARD_BIDIR
discard all bidirectional frames
Definition: defs.h:216
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Definition: options.c:250
AV_CLASS_CATEGORY_DEMUXER
@ AV_CLASS_CATEGORY_DEMUXER
Definition: log.h:33
FFFormatContext
Definition: internal.h:64
AVDISCARD_ALL
@ AVDISCARD_ALL
discard all
Definition: defs.h:219
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
FFStream::pub
AVStream pub
The public context.
Definition: internal.h:197
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
CHILD_CLASS_ITER_DONE
@ CHILD_CLASS_ITER_DONE
Definition: options.c:68
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
avformat_options
static const AVOption avformat_options[]
Definition: options_table.h:36
AV_OPT_TYPE_COLOR
@ AV_OPT_TYPE_COLOR
Definition: opt.h:250
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:245
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
AVDurationEstimationMethod
AVDurationEstimationMethod
The duration of a video can be estimated through various ways, and this enum can be used to know how ...
Definition: avformat.h:1235
AVOutputFormat::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:538
stream_group_options
static const AVOption stream_group_options[]
Definition: options.c:402
AV_OPT_FLAG_ENCODING_PARAM
#define AV_OPT_FLAG_ENCODING_PARAM
A generic parameter which can be set by the user for muxing or encoding.
Definition: opt.h:269
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
format_to_name
FF_DISABLE_DEPRECATION_WARNINGS static const FF_ENABLE_DEPRECATION_WARNINGS char * format_to_name(void *ptr)
Definition: options.c:44
stream_group_child_iterate
static const AVClass * stream_group_child_iterate(void **opaque)
Definition: options.c:375
av_disposition_from_string
int av_disposition_from_string(const char *disp)
Definition: options.c:516
avformat_stream_group_add_stream
int avformat_stream_group_add_stream(AVStreamGroup *stg, AVStream *st)
Add an already allocated stream to a stream group.
Definition: options.c:495
AV_STREAM_GROUP_PARAMS_TILE_GRID
@ AV_STREAM_GROUP_PARAMS_TILE_GRID
Definition: avformat.h:1084
options
const OptionDef options[]
AVDISCARD_NONKEY
@ AVDISCARD_NONKEY
discard all frames except keyframes
Definition: defs.h:218
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
FFFormatContext::parse_pkt
AVPacket * parse_pkt
The generic code uses this as a temporary packet to parse packets or for muxing, especially flushing.
Definition: internal.h:127
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:161
AVDISCARD_DEFAULT
@ AVDISCARD_DEFAULT
discard useless packets like 0 size packets in avi
Definition: defs.h:214
FFStream
Definition: internal.h:193
ff_free_stream
void ff_free_stream(AVStream **pst)
Frees a stream without modifying the corresponding AVFormatContext.
Definition: avformat.c:44
AVClass::category
AVClassCategory category
Category used for visualization (like color) This is only set if the category is equal for all object...
Definition: log.h:114
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AVStreamGroup::iamf_audio_element
struct AVIAMFAudioElement * iamf_audio_element
Definition: avformat.h:1123
state
static struct @395 state
av_iamf_mix_presentation_alloc
AVIAMFMixPresentation * av_iamf_mix_presentation_alloc(void)
Allocates a AVIAMFMixPresentation, and initializes its fields with default values.
Definition: iamf.c:520
av_demuxer_iterate
const AVInputFormat * av_demuxer_iterate(void **opaque)
Iterate over all registered demuxers.
Definition: allformats.c:604
AVOption::name
const char * name
Definition: opt.h:347
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:821
FFStream::pts_wrap_behavior
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: internal.h:332
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: packet.c:63
cffstreamgroup
static const av_always_inline FFStreamGroup * cffstreamgroup(const AVStreamGroup *stg)
Definition: internal.h:442
AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT
@ AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT
Definition: avformat.h:1082
FFStream::probe_packets
int probe_packets
Number of packets to buffer for codec probing.
Definition: internal.h:383
AVStreamGroup::streams
AVStream ** streams
A list of streams in the group.
Definition: avformat.h:1156
AVStreamGroup::iamf_mix_presentation
struct AVIAMFMixPresentation * iamf_mix_presentation
Definition: avformat.h:1124
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
av_iamf_audio_element_get_class
const AVClass * av_iamf_audio_element_get_class(void)
Definition: iamf.c:317
avcodec_parameters_alloc
AVCodecParameters * avcodec_parameters_alloc(void)
Allocate a new AVCodecParameters and set its fields to default values (unknown/invalid/0).
Definition: codec_par.c:56
get_category
static AVClassCategory get_category(void *ptr)
Definition: options.c:120
OFFSET
#define OFFSET(x)
Definition: options.c:336
AVClassCategory
AVClassCategory
Definition: log.h:28
AV_STREAM_GROUP_PARAMS_NONE
@ AV_STREAM_GROUP_PARAMS_NONE
Definition: avformat.h:1081
AVDISCARD_NONINTRA
@ AVDISCARD_NONINTRA
discard all non intra frames
Definition: defs.h:217
AVOutputFormat
Definition: avformat.h:509
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
tile_grid_class
static const AVClass tile_grid_class
Definition: options.c:351
avio_internal.h
av_opt_set_dict2
int av_opt_set_dict2(void *obj, AVDictionary **options, int search_flags)
Set all the options from a given dictionary on an object.
Definition: opt.c:1923
internal.h
io_close2_default
static int io_close2_default(AVFormatContext *s, AVIOContext *pb)
Definition: options.c:156
AVStream::av_class
const AVClass * av_class
A class for AVOptions.
Definition: avformat.h:747
stream_class
static const AVClass stream_class
Definition: options.c:238
ff_avio_class
const AVClass ff_avio_class
Definition: avio.c:98
FFStream::pts_buffer
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: internal.h:347
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
demux.h
avcodec.h
MAX_REORDER_DELAY
@ MAX_REORDER_DELAY
Definition: vaapi_encode.h:45
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:743
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
avformat.h
CHILD_CLASS_ITER_MUX
@ CHILD_CLASS_ITER_MUX
Definition: options.c:66
FFStreamGroup::pub
AVStreamGroup pub
The public context.
Definition: internal.h:431
AVOption::type
enum AVOptionType type
Definition: opt.h:362
av_iamf_mix_presentation_get_class
const AVClass * av_iamf_mix_presentation_get_class(void)
Definition: iamf.c:515
AVStreamGroup
Definition: avformat.h:1090
format_child_next
static void * format_child_next(void *obj, void *prev)
Definition: options.c:52
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:749
av_muxer_iterate
const AVOutputFormat * av_muxer_iterate(void **opaque)
Iterate over all registered muxers.
Definition: allformats.c:583
AV_CLASS_CATEGORY_MUXER
@ AV_CLASS_CATEGORY_MUXER
Definition: log.h:32
AVStreamGroup::nb_streams
unsigned int nb_streams
Number of elements in AVStreamGroup.streams.
Definition: avformat.h:1143
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:235
avformat_free_context
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: avformat.c:141
stream_options
static const AVOption stream_options[]
Definition: options.c:224
FFStream::info
struct FFStreamInfo * info
Stream information used internally by avformat_find_stream_info()
Definition: internal.h:247
io_open_default
static int io_open_default(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
Definition: options.c:138
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
AV_OPT_FLAG_DECODING_PARAM
#define AV_OPT_FLAG_DECODING_PARAM
A generic parameter which can be set by the user for demuxing or decoding.
Definition: opt.h:273
mem.h
AVStreamGroup::type
enum AVStreamGroupParamsType type
Group type.
Definition: avformat.h:1117
AVOption::unit
const char * unit
The logical unit to which the option belongs.
Definition: opt.h:396
FFFormatContext::pkt
AVPacket * pkt
Used to hold temporary packets for the generic demuxing code.
Definition: internal.h:134
avformat_stream_group_create
AVStreamGroup * avformat_stream_group_create(AVFormatContext *s, enum AVStreamGroupParamsType type, AVDictionary **options)
Add a new empty stream group to a media file.
Definition: options.c:422
codec_par.h
FFStream::cur_dts
int64_t cur_dts
Definition: internal.h:410
FFStream::need_context_update
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
Definition: internal.h:238
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
avio_close
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: avio.c:616
options_table.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
FFStream::fmtctx
AVFormatContext * fmtctx
Definition: internal.h:199
tile_grid_options
static const AVOption tile_grid_options[]
Definition: options.c:337
FFStreamGroup
Definition: internal.h:427
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:792
av_stream_get_class
const AVClass * av_stream_get_class(void)
Get the AVClass for AVStream.
Definition: options.c:245
AVDISCARD_NONREF
@ AVDISCARD_NONREF
discard all non reference
Definition: defs.h:215
FFFormatContext::pub
AVFormatContext pub
The public context.
Definition: internal.h:68
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:244
option_is_disposition
static int option_is_disposition(const AVOption *opt)
Definition: options.c:510
FFStream::pts_wrap_reference
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: internal.h:320
AVInputFormat::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:578
av_format_context_class
static const AVClass av_format_context_class
Definition: options.c:127
intmath.h