FFmpeg
options.c
Go to the documentation of this file.
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/opt.h"
33 
34 /**
35  * @file
36  * Options definition for AVFormatContext.
37  */
38 
40 #include "options_table.h"
42 
43 static const char* format_to_name(void* ptr)
44 {
46  if(fc->iformat) return fc->iformat->name;
47  else if(fc->oformat) return fc->oformat->name;
48  else return fc->av_class->class_name;
49 }
50 
51 static void *format_child_next(void *obj, void *prev)
52 {
53  AVFormatContext *s = obj;
54  if (!prev && s->priv_data &&
55  ((s->iformat && s->iformat->priv_class) ||
56  s->oformat && s->oformat->priv_class))
57  return s->priv_data;
58  if (s->pb && s->pb->av_class && prev != s->pb)
59  return s->pb;
60  return NULL;
61 }
62 
63 enum {
68 
69 };
70 
71 #define ITER_STATE_SHIFT 16
72 
73 static const AVClass *format_child_class_iterate(void **iter)
74 {
75  // we use the low 16 bits of iter as the value to be passed to
76  // av_(de)muxer_iterate()
77  void *val = (void*)(((uintptr_t)*iter) & ((1 << ITER_STATE_SHIFT) - 1));
78  unsigned int state = ((uintptr_t)*iter) >> ITER_STATE_SHIFT;
79  const AVClass *ret = NULL;
80 
82  ret = &ff_avio_class;
83  state++;
84  goto finish;
85  }
86 
87  if (state == CHILD_CLASS_ITER_MUX) {
88  const AVOutputFormat *ofmt;
89 
90  while ((ofmt = av_muxer_iterate(&val))) {
91  ret = ofmt->priv_class;
92  if (ret)
93  goto finish;
94  }
95 
96  val = NULL;
97  state++;
98  }
99 
100  if (state == CHILD_CLASS_ITER_DEMUX) {
101  const AVInputFormat *ifmt;
102 
103  while ((ifmt = av_demuxer_iterate(&val))) {
104  ret = ifmt->priv_class;
105  if (ret)
106  goto finish;
107  }
108  val = NULL;
109  state++;
110  }
111 
112 finish:
113  // make sure none av_(de)muxer_iterate does not set the high bits of val
114  av_assert0(!((uintptr_t)val >> ITER_STATE_SHIFT));
115  *iter = (void*)((uintptr_t)val | (state << ITER_STATE_SHIFT));
116  return ret;
117 }
118 
119 static AVClassCategory get_category(void *ptr)
120 {
121  AVFormatContext* s = ptr;
122  if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
123  else return AV_CLASS_CATEGORY_MUXER;
124 }
125 
127  .class_name = "AVFormatContext",
128  .item_name = format_to_name,
129  .option = avformat_options,
130  .version = LIBAVUTIL_VERSION_INT,
131  .child_next = format_child_next,
132  .child_class_iterate = format_child_class_iterate,
134  .get_category = get_category,
135 };
136 
138  const char *url, int flags, AVDictionary **options)
139 {
140  int loglevel;
141 
142  if (!strcmp(url, s->url) ||
143  s->iformat && !strcmp(s->iformat->name, "image2") ||
144  s->oformat && !strcmp(s->oformat->name, "image2")
145  ) {
146  loglevel = AV_LOG_DEBUG;
147  } else
148  loglevel = AV_LOG_INFO;
149 
150  av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
151 
152  return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
153 }
154 
156 {
157  return avio_close(pb);
158 }
159 
161 {
162  FFFormatContext *const si = av_mallocz(sizeof(*si));
164 
165  if (!si)
166  return NULL;
167 
168  s = &si->pub;
169  s->av_class = &av_format_context_class;
170  s->io_open = io_open_default;
171  s->io_close2= io_close2_default;
172 
174 
175  si->pkt = av_packet_alloc();
176  si->parse_pkt = av_packet_alloc();
177  if (!si->pkt || !si->parse_pkt) {
179  return NULL;
180  }
181 
182 #if FF_API_LAVF_SHORTEST
183  si->shortest_end = AV_NOPTS_VALUE;
184 #endif
185 
186  return s;
187 }
188 
189 #if FF_API_GET_DUR_ESTIMATE_METHOD
190 enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
191 {
193 }
194 #endif
195 
197 {
198  return &av_format_context_class;
199 }
200 
201 #define DISPOSITION_OPT(ctx) \
202  { "disposition", NULL, offsetof(ctx, disposition), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, \
203  .flags = AV_OPT_FLAG_ENCODING_PARAM, .unit = "disposition" }, \
204  { "default", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEFAULT }, .unit = "disposition" }, \
205  { "dub", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DUB }, .unit = "disposition" }, \
206  { "original", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ORIGINAL }, .unit = "disposition" }, \
207  { "comment", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_COMMENT }, .unit = "disposition" }, \
208  { "lyrics", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_LYRICS }, .unit = "disposition" }, \
209  { "karaoke", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_KARAOKE }, .unit = "disposition" }, \
210  { "forced", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_FORCED }, .unit = "disposition" }, \
211  { "hearing_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_HEARING_IMPAIRED }, .unit = "disposition" }, \
212  { "visual_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_VISUAL_IMPAIRED }, .unit = "disposition" }, \
213  { "clean_effects", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CLEAN_EFFECTS }, .unit = "disposition" }, \
214  { "attached_pic", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ATTACHED_PIC }, .unit = "disposition" }, \
215  { "timed_thumbnails", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_TIMED_THUMBNAILS }, .unit = "disposition" }, \
216  { "non_diegetic", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_NON_DIEGETIC }, .unit = "disposition" }, \
217  { "captions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CAPTIONS }, .unit = "disposition" }, \
218  { "descriptions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DESCRIPTIONS }, .unit = "disposition" }, \
219  { "metadata", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_METADATA }, .unit = "disposition" }, \
220  { "dependent", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEPENDENT }, .unit = "disposition" }, \
221  { "still_image", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_STILL_IMAGE }, .unit = "disposition" }
222 
223 static const AVOption stream_options[] = {
225  { "discard", NULL, offsetof(AVStream, discard), AV_OPT_TYPE_INT, { .i64 = AVDISCARD_DEFAULT }, INT_MIN, INT_MAX,
226  .flags = AV_OPT_FLAG_DECODING_PARAM, .unit = "avdiscard" },
227  { "none", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONE }, .unit = "avdiscard" },
228  { "default", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_DEFAULT }, .unit = "avdiscard" },
229  { "noref", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONREF }, .unit = "avdiscard" },
230  { "bidir", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_BIDIR }, .unit = "avdiscard" },
231  { "nointra", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONINTRA }, .unit = "avdiscard" },
232  { "nokey", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_NONKEY }, .unit = "avdiscard" },
233  { "all", .type = AV_OPT_TYPE_CONST, {.i64 = AVDISCARD_ALL }, .unit = "avdiscard" },
234  { NULL }
235 };
236 
237 static const AVClass stream_class = {
238  .class_name = "AVStream",
239  .item_name = av_default_item_name,
240  .version = LIBAVUTIL_VERSION_INT,
241  .option = stream_options,
242 };
243 
245 {
246  return &stream_class;
247 }
248 
250 {
251  FFFormatContext *const si = ffformatcontext(s);
252  FFStream *sti;
253  AVStream *st;
254  AVStream **streams;
255 
256  if (s->nb_streams >= s->max_streams) {
257  av_log(s, AV_LOG_ERROR, "Number of streams exceeds max_streams parameter"
258  " (%d), see the documentation if you wish to increase it\n",
259  s->max_streams);
260  return NULL;
261  }
262  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
263  if (!streams)
264  return NULL;
265  s->streams = streams;
266 
267  sti = av_mallocz(sizeof(*sti));
268  if (!sti)
269  return NULL;
270  st = &sti->pub;
271 
272  st->av_class = &stream_class;
274  if (!st->codecpar)
275  goto fail;
276 
277  sti->fmtctx = s;
278 
279  if (s->iformat) {
281  if (!sti->avctx)
282  goto fail;
283 
284  sti->info = av_mallocz(sizeof(*sti->info));
285  if (!sti->info)
286  goto fail;
287 
288 #if FF_API_R_FRAME_RATE
289  sti->info->last_dts = AV_NOPTS_VALUE;
290 #endif
293 
294  /* default pts setting is MPEG-like */
295  avpriv_set_pts_info(st, 33, 1, 90000);
296  /* we set the current DTS to 0 so that formats without any timestamps
297  * but durations get some timestamps, formats with some unknown
298  * timestamps have their first few packets buffered and the
299  * timestamps corrected before they are returned to the user */
300  sti->cur_dts = RELATIVE_TS_BASE;
301  } else {
302  sti->cur_dts = AV_NOPTS_VALUE;
303  }
304 
305  st->index = s->nb_streams;
307  st->duration = AV_NOPTS_VALUE;
308  sti->first_dts = AV_NOPTS_VALUE;
309  sti->probe_packets = s->max_probe_packets;
312 
315  for (int i = 0; i < MAX_REORDER_DELAY + 1; i++)
316  sti->pts_buffer[i] = AV_NOPTS_VALUE;
317 
318  st->sample_aspect_ratio = (AVRational) { 0, 1 };
319  sti->transferred_mux_tb = (AVRational) { 0, 1 };;
320 
321 #if FF_API_AVSTREAM_SIDE_DATA
322  sti->inject_global_side_data = si->inject_global_side_data;
323 #endif
324 
325  sti->need_context_update = 1;
326 
327  s->streams[s->nb_streams++] = st;
328  return st;
329 fail:
330  ff_free_stream(&st);
331  return NULL;
332 }
333 
334 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
335 #define OFFSET(x) offsetof(AVStreamGroupTileGrid, x)
336 static const AVOption tile_grid_options[] = {
337  { "grid_size", "size of the output canvas", OFFSET(coded_width),
338  AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, INT_MAX, FLAGS },
339  { "output_size", "size of valid pixels in output image meant for presentation", OFFSET(width),
340  AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, INT_MAX, FLAGS },
341  { "background_color", "set a background color for unused pixels",
342  OFFSET(background), AV_OPT_TYPE_COLOR, { .str = "black"}, 0, 0, FLAGS },
343  { "horizontal_offset", NULL, OFFSET(horizontal_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
344  { "vertical_offset", NULL, OFFSET(vertical_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
345  { NULL },
346 };
347 #undef FLAGS
348 #undef OFFSET
349 
350 static const AVClass tile_grid_class = {
351  .class_name = "AVStreamGroupTileGrid",
352  .version = LIBAVUTIL_VERSION_INT,
353  .option = tile_grid_options,
354 };
355 
356 static void *stream_group_child_next(void *obj, void *prev)
357 {
358  AVStreamGroup *stg = obj;
359  if (!prev) {
360  switch(stg->type) {
362  return stg->params.iamf_audio_element;
364  return stg->params.iamf_mix_presentation;
366  return stg->params.tile_grid;
367  default:
368  break;
369  }
370  }
371  return NULL;
372 }
373 
374 static const AVClass *stream_group_child_iterate(void **opaque)
375 {
376  uintptr_t i = (uintptr_t)*opaque;
377  const AVClass *ret = NULL;
378 
379  switch(i) {
381  i++;
382  // fall-through
385  break;
388  break;
390  ret = &tile_grid_class;
391  break;
392  default:
393  break;
394  }
395 
396  if (ret)
397  *opaque = (void*)(i + 1);
398  return ret;
399 }
400 
401 static const AVOption stream_group_options[] = {
403  {"id", "Set group id", offsetof(AVStreamGroup, id), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM },
404  { NULL }
405 };
406 
407 static const AVClass stream_group_class = {
408  .class_name = "AVStreamGroup",
409  .item_name = av_default_item_name,
410  .version = LIBAVUTIL_VERSION_INT,
411  .option = stream_group_options,
412  .child_next = stream_group_child_next,
413  .child_class_iterate = stream_group_child_iterate,
414 };
415 
417 {
418  return &stream_group_class;
419 }
420 
424 {
425  AVStreamGroup **stream_groups;
426  AVStreamGroup *stg;
427  FFStreamGroup *stgi;
428 
429  stream_groups = av_realloc_array(s->stream_groups, s->nb_stream_groups + 1,
430  sizeof(*stream_groups));
431  if (!stream_groups)
432  return NULL;
433  s->stream_groups = stream_groups;
434 
435  stgi = av_mallocz(sizeof(*stgi));
436  if (!stgi)
437  return NULL;
438  stg = &stgi->pub;
439 
441  av_opt_set_defaults(stg);
442  stg->type = type;
443  switch (type) {
446  if (!stg->params.iamf_audio_element)
447  goto fail;
448  break;
451  if (!stg->params.iamf_mix_presentation)
452  goto fail;
453  break;
455  stg->params.tile_grid = av_mallocz(sizeof(*stg->params.tile_grid));
456  if (!stg->params.tile_grid)
457  goto fail;
460  break;
461  default:
462  goto fail;
463  }
464 
465  if (options) {
467  goto fail;
468  }
469 
470  stgi->fmtctx = s;
471  stg->index = s->nb_stream_groups;
472 
473  s->stream_groups[s->nb_stream_groups++] = stg;
474 
475  return stg;
476 fail:
477  ff_free_stream_group(&stg);
478  return NULL;
479 }
480 
482 {
483  AVStream **streams = av_realloc_array(stg->streams, stg->nb_streams + 1,
484  sizeof(*stg->streams));
485  if (!streams)
486  return AVERROR(ENOMEM);
487 
488  stg->streams = streams;
489  stg->streams[stg->nb_streams++] = st;
490 
491  return 0;
492 }
493 
495 {
496  const FFStreamGroup *stgi = cffstreamgroup(stg);
497  const FFStream *sti = cffstream(st);
498 
499  if (stgi->fmtctx != sti->fmtctx)
500  return AVERROR(EINVAL);
501 
502  for (int i = 0; i < stg->nb_streams; i++)
503  if (stg->streams[i]->index == st->index)
504  return AVERROR(EEXIST);
505 
506  return stream_group_add_stream(stg, st);
507 }
508 
509 static int option_is_disposition(const AVOption *opt)
510 {
511  return opt->type == AV_OPT_TYPE_CONST &&
512  opt->unit && !strcmp(opt->unit, "disposition");
513 }
514 
515 int av_disposition_from_string(const char *disp)
516 {
517  for (const AVOption *opt = stream_options; opt->name; opt++)
518  if (option_is_disposition(opt) && !strcmp(disp, opt->name))
519  return opt->default_val.i64;
520  return AVERROR(EINVAL);
521 }
522 
523 const char *av_disposition_to_string(int disposition)
524 {
525  int val;
526 
527  if (disposition <= 0)
528  return NULL;
529 
530  val = 1 << ff_ctz(disposition);
531  for (const AVOption *opt = stream_options; opt->name; opt++)
532  if (option_is_disposition(opt) && opt->default_val.i64 == val)
533  return opt->name;
534 
535  return NULL;
536 }
CHILD_CLASS_ITER_AVIO
@ CHILD_CLASS_ITER_AVIO
Definition: options.c:64
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:157
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:470
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:1638
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:201
ITER_STATE_SHIFT
#define ITER_STATE_SHIFT
Definition: options.c:71
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:415
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:481
FFStream::last_IP_pts
int64_t last_IP_pts
Definition: internal.h:383
ffformatcontext
static av_always_inline FFFormatContext * ffformatcontext(AVFormatContext *s)
Definition: internal.h:194
format_child_class_iterate
static const AVClass * format_child_class_iterate(void **iter)
Definition: options.c:73
FLAGS
#define FLAGS
Definition: options.c:334
avformat_get_class
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:196
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:1684
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:428
MAX_REORDER_DELAY
@ MAX_REORDER_DELAY
Definition: vaapi_encode.h:45
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:358
av_disposition_to_string
const char * av_disposition_to_string(int disposition)
Definition: options.c:523
stream_group_class
static const AVClass stream_group_class
Definition: options.c:407
FFStream::transferred_mux_tb
AVRational transferred_mux_tb
Definition: internal.h:420
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:342
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:155
FFStream::avctx
struct AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:227
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:416
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:356
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
state
static struct @382 state
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:198
FFStreamInfo::last_dts
int64_t last_dts
Definition: demux.h:134
av_realloc_array
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:215
RELATIVE_TS_BASE
#define RELATIVE_TS_BASE
Definition: demux.h:167
FFStreamGroup::fmtctx
AVFormatContext * fmtctx
Definition: internal.h:439
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:48
CHILD_CLASS_ITER_DEMUX
@ CHILD_CLASS_ITER_DEMUX
Definition: options.c:66
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:249
AV_CLASS_CATEGORY_DEMUXER
@ AV_CLASS_CATEGORY_DEMUXER
Definition: log.h:33
FFFormatContext
Definition: internal.h:70
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:203
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:67
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:401
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:43
stream_group_child_iterate
static const AVClass * stream_group_child_iterate(void **opaque)
Definition: options.c:374
av_disposition_from_string
int av_disposition_from_string(const char *disp)
Definition: options.c:515
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:494
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:133
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:160
AVDISCARD_DEFAULT
@ AVDISCARD_DEFAULT
discard useless packets like 0 size packets in avi
Definition: defs.h:214
FFStream
Definition: internal.h:199
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
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:603
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:338
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:63
cffstreamgroup
static const av_always_inline FFStreamGroup * cffstreamgroup(const AVStreamGroup *stg)
Definition: internal.h:448
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:389
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:119
OFFSET
#define OFFSET(x)
Definition: options.c:335
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:255
tile_grid_class
static const AVClass tile_grid_class
Definition: options.c:350
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:1921
internal.h
io_close2_default
static int io_close2_default(AVFormatContext *s, AVIOContext *pb)
Definition: options.c:155
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:237
ff_avio_class
const AVClass ff_avio_class
Definition: avio.c:97
FFStream::pts_buffer
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: internal.h:353
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:254
demux.h
AVStreamGroup::params
union AVStreamGroup::@298 params
Group type-specific parameters.
avcodec.h
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
FFStreamGroup::pub
AVStreamGroup pub
The public context.
Definition: internal.h:437
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:51
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:582
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:223
FFStream::info
struct FFStreamInfo * info
Stream information used internally by avformat_find_stream_info()
Definition: internal.h:253
io_open_default
static int io_open_default(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
Definition: options.c:137
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
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:140
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:421
codec_par.h
FFStream::cur_dts
int64_t cur_dts
Definition: internal.h:416
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:244
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:615
options_table.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
FFStream::fmtctx
AVFormatContext * fmtctx
Definition: internal.h:205
tile_grid_options
static const AVOption tile_grid_options[]
Definition: options.c:336
FFStreamGroup
Definition: internal.h:433
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:244
AVDISCARD_NONREF
@ AVDISCARD_NONREF
discard all non reference
Definition: defs.h:215
FFFormatContext::pub
AVFormatContext pub
The public context.
Definition: internal.h:74
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:509
FFStream::pts_wrap_reference
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: internal.h:326
AVInputFormat::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:578
CHILD_CLASS_ITER_MUX
@ CHILD_CLASS_ITER_MUX
Definition: options.c:65
av_format_context_class
static const AVClass av_format_context_class
Definition: options.c:126
intmath.h