FFmpeg
webmdashenc.c
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1 /*
2  * WebM DASH Manifest XML muxer
3  * Copyright (c) 2014 Vignesh Venkatasubramanian
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /*
23  * WebM DASH Specification:
24  * https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification
25  * ISO DASH Specification:
26  * http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip
27  */
28 
29 #include <float.h>
30 #include <stdint.h>
31 #include <string.h>
32 
33 #include "avformat.h"
34 #include "matroska.h"
35 
36 #include "libavutil/avstring.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/opt.h"
40 
41 typedef struct AdaptationSet {
42  char id[10];
43  int *streams;
44  int nb_streams;
46 
47 typedef struct WebMDashMuxContext {
48  const AVClass *class;
51  int nb_as;
53  int is_live;
60 
61 static const char *get_codec_name(int codec_id)
62 {
63  return avcodec_descriptor_get(codec_id)->name;
64 }
65 
67 {
68  int i = 0;
69  double max = 0.0;
70  for (i = 0; i < s->nb_streams; i++) {
72  DURATION, NULL, 0);
73  if (!duration || atof(duration->value) < 0) continue;
74  if (atof(duration->value) > max) max = atof(duration->value);
75  }
76  return max / 1000;
77 }
78 
80 {
82  AVIOContext *pb = s->pb;
83  double min_buffer_time = 1.0;
84  avio_printf(pb, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
85  avio_printf(pb, "<MPD\n");
86  avio_printf(pb, " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n");
87  avio_printf(pb, " xmlns=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
88  avio_printf(pb, " xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
89  avio_printf(pb, " type=\"%s\"\n", w->is_live ? "dynamic" : "static");
90  if (!w->is_live) {
91  avio_printf(pb, " mediaPresentationDuration=\"PT%gS\"\n",
92  get_duration(s));
93  }
94  avio_printf(pb, " minBufferTime=\"PT%gS\"\n", min_buffer_time);
95  avio_printf(pb, " profiles=\"%s\"%s",
96  w->is_live ? "urn:mpeg:dash:profile:isoff-live:2011" : "urn:webm:dash:profile:webm-on-demand:2012",
97  w->is_live ? "\n" : ">\n");
98  if (w->is_live) {
99  time_t local_time = time(NULL);
100  struct tm gmt_buffer;
101  struct tm *gmt = gmtime_r(&local_time, &gmt_buffer);
102  char gmt_iso[21];
103  if (!strftime(gmt_iso, 21, "%Y-%m-%dT%H:%M:%SZ", gmt)) {
104  return AVERROR_UNKNOWN;
105  }
106  if (s->flags & AVFMT_FLAG_BITEXACT) {
107  av_strlcpy(gmt_iso, "", 1);
108  }
109  avio_printf(pb, " availabilityStartTime=\"%s\"\n", gmt_iso);
110  avio_printf(pb, " timeShiftBufferDepth=\"PT%gS\"\n", w->time_shift_buffer_depth);
111  avio_printf(pb, " minimumUpdatePeriod=\"PT%dS\"", w->minimum_update_period);
112  avio_printf(pb, ">\n");
113  if (w->utc_timing_url) {
114  avio_printf(pb, "<UTCTiming\n");
115  avio_printf(pb, " schemeIdUri=\"urn:mpeg:dash:utc:http-iso:2014\"\n");
116  avio_printf(pb, " value=\"%s\"/>\n", w->utc_timing_url);
117  }
118  }
119  return 0;
120 }
121 
123 {
124  avio_printf(s->pb, "</MPD>\n");
125 }
126 
128 {
129  int i;
131  CUE_TIMESTAMPS, NULL, 0);
132  if (!gold) return 0;
133  for (i = 1; i < as->nb_streams; i++) {
135  CUE_TIMESTAMPS, NULL, 0);
136  if (!ts || strncmp(gold->value, ts->value, strlen(gold->value))) return 0;
137  }
138  return 1;
139 }
140 
142 {
143  int i;
144  const AVStream *gold_st = s->streams[as->streams[0]];
145  AVDictionaryEntry *gold_track_num = av_dict_get(gold_st->metadata,
146  TRACK_NUMBER, NULL, 0);
147  AVCodecParameters *gold_par = gold_st->codecpar;
148  if (!gold_track_num) return 0;
149  for (i = 1; i < as->nb_streams; i++) {
150  const AVStream *st = s->streams[as->streams[i]];
151  AVDictionaryEntry *track_num = av_dict_get(st->metadata,
152  TRACK_NUMBER, NULL, 0);
154  if (!track_num ||
155  strncmp(gold_track_num->value, track_num->value, strlen(gold_track_num->value)) ||
156  gold_par->codec_id != par->codec_id ||
157  gold_par->extradata_size != par->extradata_size ||
158  memcmp(gold_par->extradata, par->extradata, par->extradata_size)) {
159  return 0;
160  }
161  }
162  return 1;
163 }
164 
165 /*
166  * Writes a Representation within an Adaptation Set. Returns 0 on success and
167  * < 0 on failure.
168  */
169 static int write_representation(AVFormatContext *s, AVStream *st, char *id,
170  int output_width, int output_height,
171  int output_sample_rate)
172 {
174  AVIOContext *pb = s->pb;
175  const AVCodecParameters *par = st->codecpar;
176  AVDictionaryEntry *bandwidth = av_dict_get(st->metadata, BANDWIDTH, NULL, 0);
177  const char *bandwidth_str;
178  avio_printf(pb, "<Representation id=\"%s\"", id);
179  if (bandwidth) {
180  bandwidth_str = bandwidth->value;
181  } else if (w->is_live) {
182  // if bandwidth for live was not provided, use a default
183  bandwidth_str = (par->codec_type == AVMEDIA_TYPE_AUDIO) ? "128000" : "1000000";
184  } else {
185  return AVERROR(EINVAL);
186  }
187  avio_printf(pb, " bandwidth=\"%s\"", bandwidth_str);
188  if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_width)
189  avio_printf(pb, " width=\"%d\"", par->width);
190  if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_height)
191  avio_printf(pb, " height=\"%d\"", par->height);
192  if (par->codec_type == AVMEDIA_TYPE_AUDIO && output_sample_rate)
193  avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
194  if (w->is_live) {
195  // For live streams, Codec and Mime Type always go in the Representation tag.
196  avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
197  avio_printf(pb, " mimeType=\"%s/webm\"",
198  par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
199  // For live streams, subsegments always start with key frames. So this
200  // is always 1.
201  avio_printf(pb, " startsWithSAP=\"1\"");
202  avio_printf(pb, ">");
203  } else {
205  AVDictionaryEntry *cues_start = av_dict_get(st->metadata, CUES_START, NULL, 0);
206  AVDictionaryEntry *cues_end = av_dict_get(st->metadata, CUES_END, NULL, 0);
207  AVDictionaryEntry *filename = av_dict_get(st->metadata, FILENAME, NULL, 0);
208  if (!irange || !cues_start || !cues_end || !filename)
209  return AVERROR(EINVAL);
210 
211  avio_printf(pb, ">\n");
212  avio_printf(pb, "<BaseURL>%s</BaseURL>\n", filename->value);
213  avio_printf(pb, "<SegmentBase\n");
214  avio_printf(pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
215  avio_printf(pb, "<Initialization\n");
216  avio_printf(pb, " range=\"0-%s\" />\n", irange->value);
217  avio_printf(pb, "</SegmentBase>\n");
218  }
219  avio_printf(pb, "</Representation>\n");
220  return 0;
221 }
222 
223 /*
224  * Checks if width of all streams are the same. Returns 1 if true, 0 otherwise.
225  */
227 {
228  int first_width, i;
229  if (as->nb_streams < 2) return 1;
230  first_width = s->streams[as->streams[0]]->codecpar->width;
231  for (i = 1; i < as->nb_streams; i++)
232  if (first_width != s->streams[as->streams[i]]->codecpar->width)
233  return 0;
234  return 1;
235 }
236 
237 /*
238  * Checks if height of all streams are the same. Returns 1 if true, 0 otherwise.
239  */
241 {
242  int first_height, i;
243  if (as->nb_streams < 2) return 1;
244  first_height = s->streams[as->streams[0]]->codecpar->height;
245  for (i = 1; i < as->nb_streams; i++)
246  if (first_height != s->streams[as->streams[i]]->codecpar->height)
247  return 0;
248  return 1;
249 }
250 
251 /*
252  * Checks if sample rate of all streams are the same. Returns 1 if true, 0 otherwise.
253  */
255 {
256  int first_sample_rate, i;
257  if (as->nb_streams < 2) return 1;
258  first_sample_rate = s->streams[as->streams[0]]->codecpar->sample_rate;
259  for (i = 1; i < as->nb_streams; i++)
260  if (first_sample_rate != s->streams[as->streams[i]]->codecpar->sample_rate)
261  return 0;
262  return 1;
263 }
264 
266 {
268  int i;
269  for (i = 0; i < w->nb_as; i++) {
270  av_freep(&w->as[i].streams);
271  }
272  av_freep(&w->as);
273  w->nb_as = 0;
274 }
275 
276 /*
277  * Parses a live header filename and returns the position of the '_' and '.'
278  * delimiting <file_description> and <representation_id>.
279  *
280  * Name of the header file should conform to the following pattern:
281  * <file_description>_<representation_id>.hdr where <file_description> can be
282  * anything. The chunks should be named according to the following pattern:
283  * <file_description>_<representation_id>_<chunk_number>.chk
284  */
285 static int split_filename(char *filename, char **underscore_pos,
286  char **period_pos)
287 {
288  *underscore_pos = strrchr(filename, '_');
289  if (!*underscore_pos)
290  return AVERROR(EINVAL);
291  *period_pos = strchr(*underscore_pos, '.');
292  if (!*period_pos)
293  return AVERROR(EINVAL);
294  return 0;
295 }
296 
297 /*
298  * Writes an Adaptation Set. Returns 0 on success and < 0 on failure.
299  */
300 static int write_adaptation_set(AVFormatContext *s, int as_index)
301 {
303  AdaptationSet *as = &w->as[as_index];
304  const AVStream *st = s->streams[as->streams[0]];
306  AVDictionaryEntry *lang;
307  AVIOContext *pb = s->pb;
308  int i;
309  static const char boolean[2][6] = { "false", "true" };
310  int subsegmentStartsWithSAP = 1;
311 
312  // Width, Height and Sample Rate will go in the AdaptationSet tag if they
313  // are the same for all contained Representations. otherwise, they will go
314  // on their respective Representation tag. For live streams, they always go
315  // in the Representation tag.
316  int width_in_as = 1, height_in_as = 1, sample_rate_in_as = 1;
317  if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
318  width_in_as = !w->is_live && check_matching_width (s, as);
319  height_in_as = !w->is_live && check_matching_height(s, as);
320  } else {
321  sample_rate_in_as = !w->is_live && check_matching_sample_rate(s, as);
322  }
323 
324  avio_printf(pb, "<AdaptationSet id=\"%s\"", as->id);
325  avio_printf(pb, " mimeType=\"%s/webm\"",
326  par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
327  avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
328 
329  lang = av_dict_get(st->metadata, "language", NULL, 0);
330  if (lang)
331  avio_printf(pb, " lang=\"%s\"", lang->value);
332 
333  if (par->codec_type == AVMEDIA_TYPE_VIDEO && width_in_as)
334  avio_printf(pb, " width=\"%d\"", par->width);
335  if (par->codec_type == AVMEDIA_TYPE_VIDEO && height_in_as)
336  avio_printf(pb, " height=\"%d\"", par->height);
337  if (par->codec_type == AVMEDIA_TYPE_AUDIO && sample_rate_in_as)
338  avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
339 
340  avio_printf(pb, " bitstreamSwitching=\"%s\"",
341  boolean[bitstream_switching(s, as)]);
342  avio_printf(pb, " subsegmentAlignment=\"%s\"",
343  boolean[w->is_live || subsegment_alignment(s, as)]);
344 
345  for (i = 0; i < as->nb_streams; i++) {
347  CLUSTER_KEYFRAME, NULL, 0);
348  if (!w->is_live && (!kf || !strncmp(kf->value, "0", 1))) subsegmentStartsWithSAP = 0;
349  }
350  avio_printf(pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
351  avio_printf(pb, ">\n");
352 
353  if (w->is_live) {
354  AVDictionaryEntry *filename =
355  av_dict_get(st->metadata, FILENAME, NULL, 0);
356  char *underscore_pos, *period_pos;
357  int ret;
358  if (!filename)
359  return AVERROR(EINVAL);
360  ret = split_filename(filename->value, &underscore_pos, &period_pos);
361  if (ret) return ret;
362  *underscore_pos = '\0';
363  avio_printf(pb, "<ContentComponent id=\"1\" type=\"%s\"/>\n",
364  par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
365  avio_printf(pb, "<SegmentTemplate");
366  avio_printf(pb, " timescale=\"1000\"");
367  avio_printf(pb, " duration=\"%d\"", w->chunk_duration);
368  avio_printf(pb, " media=\"%s_$RepresentationID$_$Number$.chk\"",
369  filename->value);
370  avio_printf(pb, " startNumber=\"%d\"", w->chunk_start_index);
371  avio_printf(pb, " initialization=\"%s_$RepresentationID$.hdr\"",
372  filename->value);
373  avio_printf(pb, "/>\n");
374  *underscore_pos = '_';
375  }
376 
377  for (i = 0; i < as->nb_streams; i++) {
378  char buf[25], *representation_id = buf, *underscore_pos, *period_pos;
379  AVStream *st = s->streams[as->streams[i]];
380  int ret;
381  if (w->is_live) {
382  AVDictionaryEntry *filename =
383  av_dict_get(st->metadata, FILENAME, NULL, 0);
384  if (!filename)
385  return AVERROR(EINVAL);
386  ret = split_filename(filename->value, &underscore_pos, &period_pos);
387  if (ret < 0)
388  return ret;
389  representation_id = underscore_pos + 1;
390  *period_pos = '\0';
391  } else {
392  snprintf(buf, sizeof(buf), "%d", w->representation_id++);
393  }
394  ret = write_representation(s, st, representation_id, !width_in_as,
395  !height_in_as, !sample_rate_in_as);
396  if (ret) return ret;
397  if (w->is_live)
398  *period_pos = '.';
399  }
400  avio_printf(s->pb, "</AdaptationSet>\n");
401  return 0;
402 }
403 
405 {
407  char *p = w->adaptation_sets;
408  char *q;
409  enum { new_set, parsed_id, parsing_streams } state;
410  if (!w->adaptation_sets) {
411  av_log(s, AV_LOG_ERROR, "The 'adaptation_sets' option must be set.\n");
412  return AVERROR(EINVAL);
413  }
414  // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
415  state = new_set;
416  while (1) {
417  if (*p == '\0') {
418  if (state == new_set)
419  break;
420  else
421  return AVERROR(EINVAL);
422  } else if (state == new_set && *p == ' ') {
423  p++;
424  continue;
425  } else if (state == new_set && !strncmp(p, "id=", 3)) {
426  void *mem = av_realloc(w->as, sizeof(*w->as) * (w->nb_as + 1));
427  const char *comma;
428  if (mem == NULL)
429  return AVERROR(ENOMEM);
430  w->as = mem;
431  ++w->nb_as;
432  w->as[w->nb_as - 1].nb_streams = 0;
433  w->as[w->nb_as - 1].streams = NULL;
434  p += 3; // consume "id="
435  q = w->as[w->nb_as - 1].id;
436  comma = strchr(p, ',');
437  if (!comma || comma - p >= sizeof(w->as[w->nb_as - 1].id)) {
438  av_log(s, AV_LOG_ERROR, "'id' in 'adaptation_sets' is malformed.\n");
439  return AVERROR(EINVAL);
440  }
441  while (*p != ',') *q++ = *p++;
442  *q = 0;
443  p++;
444  state = parsed_id;
445  } else if (state == parsed_id && !strncmp(p, "streams=", 8)) {
446  p += 8; // consume "streams="
447  state = parsing_streams;
448  } else if (state == parsing_streams) {
449  struct AdaptationSet *as = &w->as[w->nb_as - 1];
450  int64_t num;
451  int ret = av_reallocp_array(&as->streams, ++as->nb_streams,
452  sizeof(*as->streams));
453  if (ret < 0)
454  return ret;
455  num = strtoll(p, &q, 10);
456  if (!av_isdigit(*p) || (*q != ' ' && *q != '\0' && *q != ',') ||
457  num < 0 || num >= s->nb_streams) {
458  av_log(s, AV_LOG_ERROR, "Invalid value for 'streams' in adapation_sets.\n");
459  return AVERROR(EINVAL);
460  }
461  as->streams[as->nb_streams - 1] = num;
462  if (*q == '\0') break;
463  if (*q == ' ') state = new_set;
464  p = ++q;
465  } else {
466  return -1;
467  }
468  }
469  return 0;
470 }
471 
473 {
474  int i;
475  double start = 0.0;
476  int ret;
478 
479  for (unsigned i = 0; i < s->nb_streams; i++) {
481  if (codec_id != AV_CODEC_ID_VP8 && codec_id != AV_CODEC_ID_VP9 &&
482  codec_id != AV_CODEC_ID_VORBIS && codec_id != AV_CODEC_ID_OPUS)
483  return AVERROR(EINVAL);
484  }
485 
486  ret = parse_adaptation_sets(s);
487  if (ret < 0) {
488  goto fail;
489  }
490  ret = write_header(s);
491  if (ret < 0) {
492  goto fail;
493  }
494  avio_printf(s->pb, "<Period id=\"0\"");
495  avio_printf(s->pb, " start=\"PT%gS\"", start);
496  if (!w->is_live) {
497  avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
498  }
499  avio_printf(s->pb, " >\n");
500 
501  for (i = 0; i < w->nb_as; i++) {
502  ret = write_adaptation_set(s, i);
503  if (ret < 0) {
504  goto fail;
505  }
506  }
507 
508  avio_printf(s->pb, "</Period>\n");
509  write_footer(s);
510 fail:
512  return ret < 0 ? ret : 0;
513 }
514 
516 {
517  return AVERROR_EOF;
518 }
519 
520 #define OFFSET(x) offsetof(WebMDashMuxContext, x)
521 static const AVOption options[] = {
522  { "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
523  { "live", "create a live stream manifest", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
524  { "chunk_start_index", "start index of the chunk", OFFSET(chunk_start_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
525  { "chunk_duration_ms", "duration of each chunk (in milliseconds)", OFFSET(chunk_duration), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
526  { "utc_timing_url", "URL of the page that will return the UTC timestamp in ISO format", OFFSET(utc_timing_url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
527  { "time_shift_buffer_depth", "Smallest time (in seconds) shifting buffer for which any Representation is guaranteed to be available.", OFFSET(time_shift_buffer_depth), AV_OPT_TYPE_DOUBLE, { .dbl = 60.0 }, 1.0, DBL_MAX, AV_OPT_FLAG_ENCODING_PARAM },
528  { "minimum_update_period", "Minimum Update Period (in seconds) of the manifest.", OFFSET(minimum_update_period), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
529  { NULL },
530 };
531 
532 static const AVClass webm_dash_class = {
533  .class_name = "WebM DASH Manifest muxer",
534  .item_name = av_default_item_name,
535  .option = options,
536  .version = LIBAVUTIL_VERSION_INT,
537 };
538 
540  .name = "webm_dash_manifest",
541  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
542  .mime_type = "application/xml",
543  .extensions = "xml",
544  .priv_data_size = sizeof(WebMDashMuxContext),
547  .priv_class = &webm_dash_class,
548 };
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:702
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
static av_const int av_isdigit(int c)
Locale-independent conversion of ASCII isdigit.
Definition: avstring.h:211
AVOption.
Definition: opt.h:248
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:134
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
#define INITIALIZATION_RANGE
Definition: matroska.h:370
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static int subsegment_alignment(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:127
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
AVOutputFormat ff_webm_dash_manifest_muxer
Definition: webmdashenc.c:539
Format I/O context.
Definition: avformat.h:1351
#define gmtime_r
Definition: time_internal.h:34
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:72
Public dictionary API.
int width
Video only.
Definition: codec_par.h:126
AVOptions.
#define TRACK_NUMBER
Definition: matroska.h:378
AdaptationSet * as
Definition: webmdashenc.c:50
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
int64_t duration
Definition: movenc.c:63
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1482
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define max(a, b)
Definition: cuda_runtime.h:33
#define AVFMT_FLAG_BITEXACT
When muxing, try to avoid writing any random/volatile data to the output.
Definition: avformat.h:1499
#define av_log(a,...)
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:278
#define FILENAME
Definition: matroska.h:373
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
static int check_matching_width(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:226
static const AVOption options[]
Definition: webmdashenc.c:521
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: webmdashenc.c:515
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
static int write_representation(AVFormatContext *s, AVStream *st, char *id, int output_width, int output_height, int output_sample_rate)
Definition: webmdashenc.c:169
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
#define fail()
Definition: checkasm.h:123
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
static int webm_dash_manifest_write_header(AVFormatContext *s)
Definition: webmdashenc.c:472
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate, or free an array through a pointer to a pointer.
Definition: mem.c:206
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
static int write_header(AVFormatContext *s)
Definition: webmdashenc.c:79
static struct @322 state
double time_shift_buffer_depth
Definition: webmdashenc.c:57
#define OFFSET(x)
Definition: webmdashenc.c:520
static void write_footer(AVFormatContext *s)
Definition: webmdashenc.c:122
uint8_t w
Definition: llviddspenc.c:38
char * adaptation_sets
Definition: webmdashenc.c:49
#define CLUSTER_KEYFRAME
Definition: matroska.h:376
const char * name
Definition: avformat.h:500
static double get_duration(AVFormatContext *s)
Definition: webmdashenc.c:66
#define DURATION
Definition: matroska.h:375
static int split_filename(char *filename, char **underscore_pos, char **period_pos)
Definition: webmdashenc.c:285
#define s(width, name)
Definition: cbs_vp9.c:257
static const char * get_codec_name(int codec_id)
Definition: webmdashenc.c:61
AVDictionary * metadata
Definition: avformat.h:940
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
AVRational par
Definition: dashenc.c:95
Stream structure.
Definition: avformat.h:876
#define CUES_END
Definition: matroska.h:372
#define BANDWIDTH
Definition: matroska.h:374
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
int nb_streams
Definition: dashenc.c:94
#define CUE_TIMESTAMPS
Definition: matroska.h:377
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * name
Name of the codec described by this descriptor.
Definition: codec_desc.h:46
#define snprintf
Definition: snprintf.h:34
static void free_adaptation_sets(AVFormatContext *s)
Definition: webmdashenc.c:265
static int bitstream_switching(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:141
int sample_rate
Audio only.
Definition: codec_par.h:170
Main libavformat public API header.
static int check_matching_height(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:240
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
char * value
Definition: dict.h:87
void * priv_data
Format private data.
Definition: avformat.h:1379
static const AVClass webm_dash_class
Definition: webmdashenc.c:532
static int write_adaptation_set(AVFormatContext *s, int as_index)
Definition: webmdashenc.c:300
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3436
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
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
static int parse_adaptation_sets(AVFormatContext *s)
Definition: webmdashenc.c:404
#define CUES_START
Definition: matroska.h:371
This structure stores compressed data.
Definition: packet.h:340
int i
Definition: input.c:407
static int check_matching_sample_rate(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:254
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.