FFmpeg
webmdashenc.c
Go to the documentation of this file.
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"
39 #include "libavutil/time_internal.h"
40 
41 typedef struct AdaptationSet {
42  char id[10];
43  int *streams;
44  int nb_streams;
45 } AdaptationSet;
46 
47 typedef struct WebMDashMuxContext {
48  const AVClass *class;
49  char *adaptation_sets;
50  AdaptationSet *as;
51  int nb_as;
52  int representation_id;
53  int is_live;
54  int chunk_start_index;
55  int chunk_duration;
56  char *utc_timing_url;
57  double time_shift_buffer_depth;
58  int minimum_update_period;
59 } WebMDashMuxContext;
60 
61 static const char *get_codec_name(int codec_id)
62 {
63  return avcodec_descriptor_get(codec_id)->name;
64 }
65 
66 static double get_duration(AVFormatContext *s)
67 {
68  int i = 0;
69  double max = 0.0;
70  for (i = 0; i < s->nb_streams; i++) {
71  AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata,
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 
79 static int write_header(AVFormatContext *s)
80 {
81  WebMDashMuxContext *w = s->priv_data;
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:mpeg: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 
122 static void write_footer(AVFormatContext *s)
123 {
124  avio_printf(s->pb, "</MPD>\n");
125 }
126 
127 static int subsegment_alignment(AVFormatContext *s, const AdaptationSet *as)
128 {
129  int i;
130  AVDictionaryEntry *gold = av_dict_get(s->streams[as->streams[0]]->metadata,
131  CUE_TIMESTAMPS, NULL, 0);
132  if (!gold) return 0;
133  for (i = 1; i < as->nb_streams; i++) {
134  AVDictionaryEntry *ts = av_dict_get(s->streams[as->streams[i]]->metadata,
135  CUE_TIMESTAMPS, NULL, 0);
136  if (!ts || !av_strstart(ts->value, gold->value, NULL)) return 0;
137  }
138  return 1;
139 }
140 
141 static int bitstream_switching(AVFormatContext *s, const AdaptationSet *as)
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);
153  AVCodecParameters *par = st->codecpar;
154  if (!track_num ||
155  !av_strstart(track_num->value, gold_track_num->value, NULL) ||
156  gold_par->codec_id != par->codec_id ||
157  gold_par->extradata_size != par->extradata_size ||
158  (par->extradata_size > 0 &&
159  memcmp(gold_par->extradata, par->extradata, par->extradata_size))) {
160  return 0;
161  }
162  }
163  return 1;
164 }
165 
166 /*
167  * Writes a Representation within an Adaptation Set. Returns 0 on success and
168  * < 0 on failure.
169  */
170 static int write_representation(AVFormatContext *s, AVStream *st, char *id,
171  int output_width, int output_height,
172  int output_sample_rate)
173 {
174  WebMDashMuxContext *w = s->priv_data;
175  AVIOContext *pb = s->pb;
176  const AVCodecParameters *par = st->codecpar;
177  AVDictionaryEntry *bandwidth = av_dict_get(st->metadata, BANDWIDTH, NULL, 0);
178  const char *bandwidth_str;
179  avio_printf(pb, "<Representation id=\"%s\"", id);
180  if (bandwidth) {
181  bandwidth_str = bandwidth->value;
182  } else if (w->is_live) {
183  // if bandwidth for live was not provided, use a default
184  bandwidth_str = (par->codec_type == AVMEDIA_TYPE_AUDIO) ? "128000" : "1000000";
185  } else {
186  return AVERROR(EINVAL);
187  }
188  avio_printf(pb, " bandwidth=\"%s\"", bandwidth_str);
189  if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_width)
190  avio_printf(pb, " width=\"%d\"", par->width);
191  if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_height)
192  avio_printf(pb, " height=\"%d\"", par->height);
193  if (par->codec_type == AVMEDIA_TYPE_AUDIO && output_sample_rate)
194  avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
195  if (w->is_live) {
196  // For live streams, Codec and Mime Type always go in the Representation tag.
197  avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
198  avio_printf(pb, " mimeType=\"%s/webm\"",
199  par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
200  // For live streams, subsegments always start with key frames. So this
201  // is always 1.
202  avio_printf(pb, " startsWithSAP=\"1\"");
203  avio_printf(pb, ">");
204  } else {
205  AVDictionaryEntry *irange = av_dict_get(st->metadata, INITIALIZATION_RANGE, NULL, 0);
206  AVDictionaryEntry *cues_start = av_dict_get(st->metadata, CUES_START, NULL, 0);
207  AVDictionaryEntry *cues_end = av_dict_get(st->metadata, CUES_END, NULL, 0);
208  AVDictionaryEntry *filename = av_dict_get(st->metadata, FILENAME, NULL, 0);
209  if (!irange || !cues_start || !cues_end || !filename)
210  return AVERROR(EINVAL);
211 
212  avio_printf(pb, ">\n");
213  avio_printf(pb, "<BaseURL>%s</BaseURL>\n", filename->value);
214  avio_printf(pb, "<SegmentBase\n");
215  avio_printf(pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
216  avio_printf(pb, "<Initialization\n");
217  avio_printf(pb, " range=\"0-%s\" />\n", irange->value);
218  avio_printf(pb, "</SegmentBase>\n");
219  }
220  avio_printf(pb, "</Representation>\n");
221  return 0;
222 }
223 
224 /*
225  * Checks if width of all streams are the same. Returns 1 if true, 0 otherwise.
226  */
227 static int check_matching_width(AVFormatContext *s, const AdaptationSet *as)
228 {
229  int first_width, i;
230  if (as->nb_streams < 2) return 1;
231  first_width = s->streams[as->streams[0]]->codecpar->width;
232  for (i = 1; i < as->nb_streams; i++)
233  if (first_width != s->streams[as->streams[i]]->codecpar->width)
234  return 0;
235  return 1;
236 }
237 
238 /*
239  * Checks if height of all streams are the same. Returns 1 if true, 0 otherwise.
240  */
241 static int check_matching_height(AVFormatContext *s, const AdaptationSet *as)
242 {
243  int first_height, i;
244  if (as->nb_streams < 2) return 1;
245  first_height = s->streams[as->streams[0]]->codecpar->height;
246  for (i = 1; i < as->nb_streams; i++)
247  if (first_height != s->streams[as->streams[i]]->codecpar->height)
248  return 0;
249  return 1;
250 }
251 
252 /*
253  * Checks if sample rate of all streams are the same. Returns 1 if true, 0 otherwise.
254  */
255 static int check_matching_sample_rate(AVFormatContext *s, const AdaptationSet *as)
256 {
257  int first_sample_rate, i;
258  if (as->nb_streams < 2) return 1;
259  first_sample_rate = s->streams[as->streams[0]]->codecpar->sample_rate;
260  for (i = 1; i < as->nb_streams; i++)
261  if (first_sample_rate != s->streams[as->streams[i]]->codecpar->sample_rate)
262  return 0;
263  return 1;
264 }
265 
266 static void free_adaptation_sets(AVFormatContext *s)
267 {
268  WebMDashMuxContext *w = s->priv_data;
269  int i;
270  for (i = 0; i < w->nb_as; i++) {
271  av_freep(&w->as[i].streams);
272  }
273  av_freep(&w->as);
274  w->nb_as = 0;
275 }
276 
277 /*
278  * Parses a live header filename and returns the position of the '_' and '.'
279  * delimiting <file_description> and <representation_id>.
280  *
281  * Name of the header file should conform to the following pattern:
282  * <file_description>_<representation_id>.hdr where <file_description> can be
283  * anything. The chunks should be named according to the following pattern:
284  * <file_description>_<representation_id>_<chunk_number>.chk
285  */
286 static int split_filename(char *filename, char **underscore_pos,
287  char **period_pos)
288 {
289  *underscore_pos = strrchr(filename, '_');
290  if (!*underscore_pos)
291  return AVERROR(EINVAL);
292  *period_pos = strchr(*underscore_pos, '.');
293  if (!*period_pos)
294  return AVERROR(EINVAL);
295  return 0;
296 }
297 
298 /*
299  * Writes an Adaptation Set. Returns 0 on success and < 0 on failure.
300  */
301 static int write_adaptation_set(AVFormatContext *s, int as_index)
302 {
303  WebMDashMuxContext *w = s->priv_data;
304  AdaptationSet *as = &w->as[as_index];
305  const AVStream *st = s->streams[as->streams[0]];
306  AVCodecParameters *par = st->codecpar;
307  AVDictionaryEntry *lang;
308  AVIOContext *pb = s->pb;
309  int i;
310  static const char boolean[2][6] = { "false", "true" };
311  int subsegmentStartsWithSAP = 1;
312 
313  // Width, Height and Sample Rate will go in the AdaptationSet tag if they
314  // are the same for all contained Representations. otherwise, they will go
315  // on their respective Representation tag. For live streams, they always go
316  // in the Representation tag.
317  int width_in_as = 1, height_in_as = 1, sample_rate_in_as = 1;
318  if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
319  width_in_as = !w->is_live && check_matching_width (s, as);
320  height_in_as = !w->is_live && check_matching_height(s, as);
321  } else {
322  sample_rate_in_as = !w->is_live && check_matching_sample_rate(s, as);
323  }
324 
325  avio_printf(pb, "<AdaptationSet id=\"%s\"", as->id);
326  avio_printf(pb, " mimeType=\"%s/webm\"",
327  par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
328  avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
329 
330  lang = av_dict_get(st->metadata, "language", NULL, 0);
331  if (lang)
332  avio_printf(pb, " lang=\"%s\"", lang->value);
333 
334  if (par->codec_type == AVMEDIA_TYPE_VIDEO && width_in_as)
335  avio_printf(pb, " width=\"%d\"", par->width);
336  if (par->codec_type == AVMEDIA_TYPE_VIDEO && height_in_as)
337  avio_printf(pb, " height=\"%d\"", par->height);
338  if (par->codec_type == AVMEDIA_TYPE_AUDIO && sample_rate_in_as)
339  avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
340 
341  avio_printf(pb, " bitstreamSwitching=\"%s\"",
342  boolean[bitstream_switching(s, as)]);
343  avio_printf(pb, " subsegmentAlignment=\"%s\"",
344  boolean[w->is_live || subsegment_alignment(s, as)]);
345 
346  for (i = 0; i < as->nb_streams; i++) {
347  AVDictionaryEntry *kf = av_dict_get(s->streams[as->streams[i]]->metadata,
348  CLUSTER_KEYFRAME, NULL, 0);
349  if (!w->is_live && (!kf || !strncmp(kf->value, "0", 1))) subsegmentStartsWithSAP = 0;
350  }
351  avio_printf(pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
352  avio_printf(pb, ">\n");
353 
354  if (w->is_live) {
355  AVDictionaryEntry *filename =
356  av_dict_get(st->metadata, FILENAME, NULL, 0);
357  char *underscore_pos, *period_pos;
358  int ret;
359  if (!filename)
360  return AVERROR(EINVAL);
361  ret = split_filename(filename->value, &underscore_pos, &period_pos);
362  if (ret) return ret;
363  *underscore_pos = '\0';
364  avio_printf(pb, "<ContentComponent id=\"1\" type=\"%s\"/>\n",
365  par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
366  avio_printf(pb, "<SegmentTemplate");
367  avio_printf(pb, " timescale=\"1000\"");
368  avio_printf(pb, " duration=\"%d\"", w->chunk_duration);
369  avio_printf(pb, " media=\"%s_$RepresentationID$_$Number$.chk\"",
370  filename->value);
371  avio_printf(pb, " startNumber=\"%d\"", w->chunk_start_index);
372  avio_printf(pb, " initialization=\"%s_$RepresentationID$.hdr\"",
373  filename->value);
374  avio_printf(pb, "/>\n");
375  *underscore_pos = '_';
376  }
377 
378  for (i = 0; i < as->nb_streams; i++) {
379  char buf[25], *representation_id = buf, *underscore_pos, *period_pos;
380  AVStream *st = s->streams[as->streams[i]];
381  int ret;
382  if (w->is_live) {
383  AVDictionaryEntry *filename =
384  av_dict_get(st->metadata, FILENAME, NULL, 0);
385  if (!filename)
386  return AVERROR(EINVAL);
387  ret = split_filename(filename->value, &underscore_pos, &period_pos);
388  if (ret < 0)
389  return ret;
390  representation_id = underscore_pos + 1;
391  *period_pos = '\0';
392  } else {
393  snprintf(buf, sizeof(buf), "%d", w->representation_id++);
394  }
395  ret = write_representation(s, st, representation_id, !width_in_as,
396  !height_in_as, !sample_rate_in_as);
397  if (ret) return ret;
398  if (w->is_live)
399  *period_pos = '.';
400  }
401  avio_printf(s->pb, "</AdaptationSet>\n");
402  return 0;
403 }
404 
405 static int parse_adaptation_sets(AVFormatContext *s)
406 {
407  WebMDashMuxContext *w = s->priv_data;
408  char *p = w->adaptation_sets;
409  char *q;
410  enum { new_set, parsed_id, parsing_streams } state;
411  if (!w->adaptation_sets) {
412  av_log(s, AV_LOG_ERROR, "The 'adaptation_sets' option must be set.\n");
413  return AVERROR(EINVAL);
414  }
415  // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
416  state = new_set;
417  while (1) {
418  if (*p == '\0') {
419  if (state == new_set)
420  break;
421  else
422  return AVERROR(EINVAL);
423  } else if (state == new_set && *p == ' ') {
424  p++;
425  continue;
426  } else if (state == new_set && !strncmp(p, "id=", 3)) {
427  void *mem = av_realloc(w->as, sizeof(*w->as) * (w->nb_as + 1));
428  const char *comma;
429  if (mem == NULL)
430  return AVERROR(ENOMEM);
431  w->as = mem;
432  ++w->nb_as;
433  w->as[w->nb_as - 1].nb_streams = 0;
434  w->as[w->nb_as - 1].streams = NULL;
435  p += 3; // consume "id="
436  q = w->as[w->nb_as - 1].id;
437  comma = strchr(p, ',');
438  if (!comma || comma - p >= sizeof(w->as[w->nb_as - 1].id)) {
439  av_log(s, AV_LOG_ERROR, "'id' in 'adaptation_sets' is malformed.\n");
440  return AVERROR(EINVAL);
441  }
442  while (*p != ',') *q++ = *p++;
443  *q = 0;
444  p++;
445  state = parsed_id;
446  } else if (state == parsed_id && !strncmp(p, "streams=", 8)) {
447  p += 8; // consume "streams="
448  state = parsing_streams;
449  } else if (state == parsing_streams) {
450  struct AdaptationSet *as = &w->as[w->nb_as - 1];
451  int64_t num;
452  int ret = av_reallocp_array(&as->streams, ++as->nb_streams,
453  sizeof(*as->streams));
454  if (ret < 0)
455  return ret;
456  num = strtoll(p, &q, 10);
457  if (!av_isdigit(*p) || (*q != ' ' && *q != '\0' && *q != ',') ||
458  num < 0 || num >= s->nb_streams) {
459  av_log(s, AV_LOG_ERROR, "Invalid value for 'streams' in adapation_sets.\n");
460  return AVERROR(EINVAL);
461  }
462  as->streams[as->nb_streams - 1] = num;
463  if (*q == '\0') break;
464  if (*q == ' ') state = new_set;
465  p = ++q;
466  } else {
467  return -1;
468  }
469  }
470  return 0;
471 }
472 
473 static int webm_dash_manifest_write_header(AVFormatContext *s)
474 {
475  int i;
476  double start = 0.0;
477  int ret;
478  WebMDashMuxContext *w = s->priv_data;
479 
480  for (unsigned i = 0; i < s->nb_streams; i++) {
481  enum AVCodecID codec_id = s->streams[i]->codecpar->codec_id;
482  if (codec_id != AV_CODEC_ID_VP8 && codec_id != AV_CODEC_ID_VP9 &&
483  codec_id != AV_CODEC_ID_VORBIS && codec_id != AV_CODEC_ID_OPUS)
484  return AVERROR(EINVAL);
485  }
486 
487  ret = parse_adaptation_sets(s);
488  if (ret < 0) {
489  goto fail;
490  }
491  ret = write_header(s);
492  if (ret < 0) {
493  goto fail;
494  }
495  avio_printf(s->pb, "<Period id=\"0\"");
496  avio_printf(s->pb, " start=\"PT%gS\"", start);
497  if (!w->is_live) {
498  avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
499  }
500  avio_printf(s->pb, " >\n");
501 
502  for (i = 0; i < w->nb_as; i++) {
503  ret = write_adaptation_set(s, i);
504  if (ret < 0) {
505  goto fail;
506  }
507  }
508 
509  avio_printf(s->pb, "</Period>\n");
510  write_footer(s);
511 fail:
512  free_adaptation_sets(s);
513  return ret < 0 ? ret : 0;
514 }
515 
516 static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
517 {
518  return AVERROR_EOF;
519 }
520 
521 #define OFFSET(x) offsetof(WebMDashMuxContext, x)
522 static const AVOption options[] = {
523  { "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 },
524  { "live", "create a live stream manifest", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
525  { "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 },
526  { "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 },
527  { "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 },
528  { "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 },
529  { "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 },
530  { NULL },
531 };
532 
533 static const AVClass webm_dash_class = {
534  .class_name = "WebM DASH Manifest muxer",
535  .item_name = av_default_item_name,
536  .option = options,
537  .version = LIBAVUTIL_VERSION_INT,
538 };
539 
540 AVOutputFormat ff_webm_dash_manifest_muxer = {
541  .name = "webm_dash_manifest",
542  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
543  .mime_type = "application/xml",
544  .extensions = "xml",
545  .priv_data_size = sizeof(WebMDashMuxContext),
546  .write_header = webm_dash_manifest_write_header,
547  .write_packet = webm_dash_manifest_write_packet,
548  .priv_class = &webm_dash_class,
549 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
AVOutputFormat::name
const char * name
Definition: avformat.h:491
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
check_matching_width
static int check_matching_width(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:227
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
bitstream_switching
static int bitstream_switching(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:141
check_matching_sample_rate
static int check_matching_sample_rate(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:255
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
free_adaptation_sets
static void free_adaptation_sets(AVFormatContext *s)
Definition: webmdashenc.c:266
AVCodecDescriptor::name
const char * name
Name of the codec described by this descriptor.
Definition: codec_desc.h:46
state
static struct @321 state
CUES_START
#define CUES_START
Definition: matroska.h:376
AdaptationSet::id
int id
Definition: dashenc.c:83
w
uint8_t w
Definition: llviddspenc.c:39
AVOption
AVOption.
Definition: opt.h:248
write_footer
static void write_footer(AVFormatContext *s)
Definition: webmdashenc.c:122
matroska.h
split_filename
static int split_filename(char *filename, char **underscore_pos, char **period_pos)
Definition: webmdashenc.c:286
float.h
max
#define max(a, b)
Definition: cuda_runtime.h:33
AVERROR_UNKNOWN
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
AdaptationSet::nb_streams
int nb_streams
Definition: dashenc.c:94
fail
#define fail()
Definition: checkasm.h:133
gmtime_r
#define gmtime_r
Definition: time_internal.h:34
write_representation
static int write_representation(AVFormatContext *s, AVStream *st, char *id, int output_width, int output_height, int output_sample_rate)
Definition: webmdashenc.c:170
AdaptationSet::streams
int * streams
Definition: webmdashenc.c:43
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
duration
int64_t duration
Definition: movenc.c:64
av_dict_get
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
webm_dash_manifest_write_packet
static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: webmdashenc.c:516
s
#define s(width, name)
Definition: cbs_vp9.c:257
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:278
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_CODEC_ID_VP9
@ AV_CODEC_ID_VP9
Definition: codec_id.h:217
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
TRACK_NUMBER
#define TRACK_NUMBER
Definition: matroska.h:383
WebMDashMuxContext::representation_id
int representation_id
Definition: webmdashenc.c:52
get_duration
static double get_duration(AVFormatContext *s)
Definition: webmdashenc.c:66
CLUSTER_KEYFRAME
#define CLUSTER_KEYFRAME
Definition: matroska.h:381
codec_id
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
write_header
static int write_header(AVFormatContext *s)
Definition: webmdashenc.c:79
get_codec_name
static const char * get_codec_name(int codec_id)
Definition: webmdashenc.c:61
time_internal.h
WebMDashMuxContext::is_live
int is_live
Definition: webmdashenc.c:53
AVFormatContext
Format I/O context.
Definition: avformat.h:1232
parse_adaptation_sets
static int parse_adaptation_sets(AVFormatContext *s)
Definition: webmdashenc.c:405
subsegment_alignment
static int subsegment_alignment(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:127
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
WebMDashMuxContext::chunk_duration
int chunk_duration
Definition: webmdashenc.c:55
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
WebMDashMuxContext::adaptation_sets
char * adaptation_sets
Definition: webmdashenc.c:49
AVStream::metadata
AVDictionary * metadata
Definition: avformat.h:937
WebMDashMuxContext
Definition: webmdashenc.c:47
CUES_END
#define CUES_END
Definition: matroska.h:377
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
webm_dash_manifest_write_header
static int webm_dash_manifest_write_header(AVFormatContext *s)
Definition: webmdashenc.c:473
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
WebMDashMuxContext::nb_as
int nb_as
Definition: webmdashenc.c:51
AV_CODEC_ID_OPUS
@ AV_CODEC_ID_OPUS
Definition: codec_id.h:484
INITIALIZATION_RANGE
#define INITIALIZATION_RANGE
Definition: matroska.h:375
av_isdigit
static av_const int av_isdigit(int c)
Locale-independent conversion of ASCII isdigit.
Definition: avstring.h:211
av_reallocp_array
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
OFFSET
#define OFFSET(x)
Definition: webmdashenc.c:521
av_strstart
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
av_realloc
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:134
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:729
check_matching_height
static int check_matching_height(AVFormatContext *s, const AdaptationSet *as)
Definition: webmdashenc.c:241
FILENAME
#define FILENAME
Definition: matroska.h:378
WebMDashMuxContext::chunk_start_index
int chunk_start_index
Definition: webmdashenc.c:54
i
int i
Definition: input.c:407
AVOutputFormat
Definition: avformat.h:490
BANDWIDTH
#define BANDWIDTH
Definition: matroska.h:379
AVCodecParameters::height
int height
Definition: codec_par.h:127
DURATION
#define DURATION
Definition: matroska.h:380
ff_webm_dash_manifest_muxer
AVOutputFormat ff_webm_dash_manifest_muxer
Definition: webmdashenc.c:540
AdaptationSet
Definition: dashenc.c:82
CUE_TIMESTAMPS
#define CUE_TIMESTAMPS
Definition: matroska.h:382
write_adaptation_set
static int write_adaptation_set(AVFormatContext *s, int as_index)
Definition: webmdashenc.c:301
ret
ret
Definition: filter_design.txt:187
AVFMT_FLAG_BITEXACT
#define AVFMT_FLAG_BITEXACT
When muxing, try to avoid writing any random/volatile data to the output.
Definition: avformat.h:1380
AVStream
Stream structure.
Definition: avformat.h:873
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:72
options
static const AVOption options[]
Definition: webmdashenc.c:522
WebMDashMuxContext::minimum_update_period
int minimum_update_period
Definition: webmdashenc.c:58
avformat.h
dict.h
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.
webm_dash_class
static const AVClass webm_dash_class
Definition: webmdashenc.c:533
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
WebMDashMuxContext::time_shift_buffer_depth
double time_shift_buffer_depth
Definition: webmdashenc.c:57
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVDictionaryEntry
Definition: dict.h:81
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:346
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AV_CODEC_ID_VP8
@ AV_CODEC_ID_VP8
Definition: codec_id.h:189
av_strlcpy
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
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
avcodec_descriptor_get
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3501
AV_CODEC_ID_VORBIS
@ AV_CODEC_ID_VORBIS
Definition: codec_id.h:429
AVDictionaryEntry::value
char * value
Definition: dict.h:83
avstring.h
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
WebMDashMuxContext::as
AdaptationSet * as
Definition: webmdashenc.c:50
WebMDashMuxContext::utc_timing_url
char * utc_timing_url
Definition: webmdashenc.c:56
snprintf
#define snprintf
Definition: snprintf.h:34
Generated on Wed Aug 24 2022 21:34:48 for FFmpeg by   doxygen 1.8.17