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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 "avio_internal.h"
35 #include "matroska.h"
36 
37 #include "libavutil/avstring.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/opt.h"
41 
42 typedef struct AdaptationSet {
43  char id[10];
44  int *streams;
47 
48 typedef struct WebMDashMuxContext {
49  const AVClass *class;
52  int nb_as;
54  int is_live;
62 
63 static const char *get_codec_name(int codec_id)
64 {
65  switch (codec_id) {
66  case AV_CODEC_ID_VP8:
67  return "vp8";
68  case AV_CODEC_ID_VP9:
69  return "vp9";
70  case AV_CODEC_ID_VORBIS:
71  return "vorbis";
72  case AV_CODEC_ID_OPUS:
73  return "opus";
74  }
75  return NULL;
76 }
77 
79 {
80  int i = 0;
81  double max = 0.0;
82  for (i = 0; i < s->nb_streams; i++) {
84  DURATION, NULL, 0);
85  if (!duration || atof(duration->value) < 0) continue;
86  if (atof(duration->value) > max) max = atof(duration->value);
87  }
88  return max / 1000;
89 }
90 
92 {
94  double min_buffer_time = 1.0;
95  avio_printf(s->pb, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
96  avio_printf(s->pb, "<MPD\n");
97  avio_printf(s->pb, " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n");
98  avio_printf(s->pb, " xmlns=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
99  avio_printf(s->pb, " xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
100  avio_printf(s->pb, " type=\"%s\"\n", w->is_live ? "dynamic" : "static");
101  if (!w->is_live) {
102  avio_printf(s->pb, " mediaPresentationDuration=\"PT%gS\"\n",
103  get_duration(s));
104  }
105  avio_printf(s->pb, " minBufferTime=\"PT%gS\"\n", min_buffer_time);
106  avio_printf(s->pb, " profiles=\"%s\"%s",
107  w->is_live ? "urn:mpeg:dash:profile:isoff-live:2011" : "urn:webm:dash:profile:webm-on-demand:2012",
108  w->is_live ? "\n" : ">\n");
109  if (w->is_live) {
110  time_t local_time = time(NULL);
111  struct tm gmt_buffer;
112  struct tm *gmt = gmtime_r(&local_time, &gmt_buffer);
113  char gmt_iso[21];
114  if (!strftime(gmt_iso, 21, "%Y-%m-%dT%H:%M:%SZ", gmt)) {
115  return AVERROR_UNKNOWN;
116  }
117  if (w->debug_mode) {
118  av_strlcpy(gmt_iso, "", 1);
119  }
120  avio_printf(s->pb, " availabilityStartTime=\"%s\"\n", gmt_iso);
121  avio_printf(s->pb, " timeShiftBufferDepth=\"PT%gS\"\n", w->time_shift_buffer_depth);
122  avio_printf(s->pb, " minimumUpdatePeriod=\"PT%dS\"", w->minimum_update_period);
123  avio_printf(s->pb, ">\n");
124  if (w->utc_timing_url) {
125  avio_printf(s->pb, "<UTCTiming\n");
126  avio_printf(s->pb, " schemeIdUri=\"urn:mpeg:dash:utc:http-iso:2014\"\n");
127  avio_printf(s->pb, " value=\"%s\"/>\n", w->utc_timing_url);
128  }
129  }
130  return 0;
131 }
132 
134 {
135  avio_printf(s->pb, "</MPD>\n");
136 }
137 
139  int i;
141  CUE_TIMESTAMPS, NULL, 0);
142  if (!gold) return 0;
143  for (i = 1; i < as->nb_streams; i++) {
145  CUE_TIMESTAMPS, NULL, 0);
146  if (!ts || strncmp(gold->value, ts->value, strlen(gold->value))) return 0;
147  }
148  return 1;
149 }
150 
152  int i;
153  AVDictionaryEntry *gold_track_num = av_dict_get(s->streams[as->streams[0]]->metadata,
154  TRACK_NUMBER, NULL, 0);
155  AVCodecContext *gold_codec = s->streams[as->streams[0]]->codec;
156  if (!gold_track_num) return 0;
157  for (i = 1; i < as->nb_streams; i++) {
158  AVDictionaryEntry *track_num = av_dict_get(s->streams[as->streams[i]]->metadata,
159  TRACK_NUMBER, NULL, 0);
160  AVCodecContext *codec = s->streams[as->streams[i]]->codec;
161  if (!track_num ||
162  strncmp(gold_track_num->value, track_num->value, strlen(gold_track_num->value)) ||
163  gold_codec->codec_id != codec->codec_id ||
164  gold_codec->extradata_size != codec->extradata_size ||
165  memcmp(gold_codec->extradata, codec->extradata, codec->extradata_size)) {
166  return 0;
167  }
168  }
169  return 1;
170 }
171 
172 /*
173  * Writes a Representation within an Adaptation Set. Returns 0 on success and
174  * < 0 on failure.
175  */
176 static int write_representation(AVFormatContext *s, AVStream *stream, char *id,
177  int output_width, int output_height,
178  int output_sample_rate) {
181  AVDictionaryEntry *cues_start = av_dict_get(stream->metadata, CUES_START, NULL, 0);
182  AVDictionaryEntry *cues_end = av_dict_get(stream->metadata, CUES_END, NULL, 0);
183  AVDictionaryEntry *filename = av_dict_get(stream->metadata, FILENAME, NULL, 0);
184  AVDictionaryEntry *bandwidth = av_dict_get(stream->metadata, BANDWIDTH, NULL, 0);
185  if ((w->is_live && (!filename)) ||
186  (!w->is_live && (!irange || !cues_start || !cues_end || !filename || !bandwidth))) {
187  return AVERROR_INVALIDDATA;
188  }
189  avio_printf(s->pb, "<Representation id=\"%s\"", id);
190  // FIXME: For live, This should be obtained from the input file or as an AVOption.
191  avio_printf(s->pb, " bandwidth=\"%s\"",
192  w->is_live ? (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO ? "128000" : "1000000") : bandwidth->value);
193  if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO && output_width)
194  avio_printf(s->pb, " width=\"%d\"", stream->codec->width);
195  if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO && output_height)
196  avio_printf(s->pb, " height=\"%d\"", stream->codec->height);
197  if (stream->codec->codec_type = AVMEDIA_TYPE_AUDIO && output_sample_rate)
198  avio_printf(s->pb, " audioSamplingRate=\"%d\"", stream->codec->sample_rate);
199  if (w->is_live) {
200  // For live streams, Codec and Mime Type always go in the Representation tag.
201  avio_printf(s->pb, " codecs=\"%s\"", get_codec_name(stream->codec->codec_id));
202  avio_printf(s->pb, " mimeType=\"%s/webm\"",
203  stream->codec->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
204  // For live streams, subsegments always start with key frames. So this
205  // is always 1.
206  avio_printf(s->pb, " startsWithSAP=\"1\"");
207  avio_printf(s->pb, ">");
208  } else {
209  avio_printf(s->pb, ">\n");
210  avio_printf(s->pb, "<BaseURL>%s</BaseURL>\n", filename->value);
211  avio_printf(s->pb, "<SegmentBase\n");
212  avio_printf(s->pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
213  avio_printf(s->pb, "<Initialization\n");
214  avio_printf(s->pb, " range=\"0-%s\" />\n", irange->value);
215  avio_printf(s->pb, "</SegmentBase>\n");
216  }
217  avio_printf(s->pb, "</Representation>\n");
218  return 0;
219 }
220 
221 /*
222  * Checks if width of all streams are the same. Returns 1 if true, 0 otherwise.
223  */
225  int first_width, i;
226  if (as->nb_streams < 2) return 1;
227  first_width = s->streams[as->streams[0]]->codec->width;
228  for (i = 1; i < as->nb_streams; i++)
229  if (first_width != s->streams[as->streams[i]]->codec->width)
230  return 0;
231  return 1;
232 }
233 
234 /*
235  * Checks if height of all streams are the same. Returns 1 if true, 0 otherwise.
236  */
238  int first_height, i;
239  if (as->nb_streams < 2) return 1;
240  first_height = s->streams[as->streams[0]]->codec->height;
241  for (i = 1; i < as->nb_streams; i++)
242  if (first_height != s->streams[as->streams[i]]->codec->height)
243  return 0;
244  return 1;
245 }
246 
247 /*
248  * Checks if sample rate of all streams are the same. Returns 1 if true, 0 otherwise.
249  */
251  int first_sample_rate, i;
252  if (as->nb_streams < 2) return 1;
253  first_sample_rate = s->streams[as->streams[0]]->codec->sample_rate;
254  for (i = 1; i < as->nb_streams; i++)
255  if (first_sample_rate != s->streams[as->streams[i]]->codec->sample_rate)
256  return 0;
257  return 1;
258 }
259 
262  int i;
263  for (i = 0; i < w->nb_as; i++) {
264  av_freep(&w->as[i].streams);
265  }
266  av_freep(&w->as);
267  w->nb_as = 0;
268 }
269 
270 /*
271  * Parses a live header filename and computes the representation id,
272  * initialization pattern and the media pattern. Pass NULL if you don't want to
273  * compute any of those 3. Returns 0 on success and non-zero on failure.
274  *
275  * Name of the header file should conform to the following pattern:
276  * <file_description>_<representation_id>.hdr where <file_description> can be
277  * anything. The chunks should be named according to the following pattern:
278  * <file_description>_<representation_id>_<chunk_number>.chk
279  */
280 static int parse_filename(char *filename, char **representation_id,
281  char **initialization_pattern, char **media_pattern) {
282  char *underscore_pos = NULL;
283  char *period_pos = NULL;
284  char *temp_pos = NULL;
285  char *filename_str = av_strdup(filename);
286  if (!filename_str) return AVERROR(ENOMEM);
287  temp_pos = av_stristr(filename_str, "_");
288  while (temp_pos) {
289  underscore_pos = temp_pos + 1;
290  temp_pos = av_stristr(temp_pos + 1, "_");
291  }
292  if (!underscore_pos) return AVERROR_INVALIDDATA;
293  period_pos = av_stristr(underscore_pos, ".");
294  if (!period_pos) return AVERROR_INVALIDDATA;
295  *(underscore_pos - 1) = 0;
296  if (representation_id) {
297  *representation_id = av_malloc(period_pos - underscore_pos + 1);
298  if (!(*representation_id)) return AVERROR(ENOMEM);
299  av_strlcpy(*representation_id, underscore_pos, period_pos - underscore_pos + 1);
300  }
301  if (initialization_pattern) {
302  *initialization_pattern = av_asprintf("%s_$RepresentationID$.hdr",
303  filename_str);
304  if (!(*initialization_pattern)) return AVERROR(ENOMEM);
305  }
306  if (media_pattern) {
307  *media_pattern = av_asprintf("%s_$RepresentationID$_$Number$.chk",
308  filename_str);
309  if (!(*media_pattern)) return AVERROR(ENOMEM);
310  }
311  av_free(filename_str);
312  return 0;
313 }
314 
315 /*
316  * Writes an Adaptation Set. Returns 0 on success and < 0 on failure.
317  */
318 static int write_adaptation_set(AVFormatContext *s, int as_index)
319 {
321  AdaptationSet *as = &w->as[as_index];
322  AVCodecContext *codec = s->streams[as->streams[0]]->codec;
323  AVDictionaryEntry *lang;
324  int i;
325  static const char boolean[2][6] = { "false", "true" };
326  int subsegmentStartsWithSAP = 1;
327 
328  // Width, Height and Sample Rate will go in the AdaptationSet tag if they
329  // are the same for all contained Representations. otherwise, they will go
330  // on their respective Representation tag. For live streams, they always go
331  // in the Representation tag.
332  int width_in_as = 1, height_in_as = 1, sample_rate_in_as = 1;
333  if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
334  width_in_as = !w->is_live && check_matching_width(s, as);
335  height_in_as = !w->is_live && check_matching_height(s, as);
336  } else {
337  sample_rate_in_as = !w->is_live && check_matching_sample_rate(s, as);
338  }
339 
340  avio_printf(s->pb, "<AdaptationSet id=\"%s\"", as->id);
341  avio_printf(s->pb, " mimeType=\"%s/webm\"",
342  codec->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
343  avio_printf(s->pb, " codecs=\"%s\"", get_codec_name(codec->codec_id));
344 
345  lang = av_dict_get(s->streams[as->streams[0]]->metadata, "language", NULL, 0);
346  if (lang) avio_printf(s->pb, " lang=\"%s\"", lang->value);
347 
348  if (codec->codec_type == AVMEDIA_TYPE_VIDEO && width_in_as)
349  avio_printf(s->pb, " width=\"%d\"", codec->width);
350  if (codec->codec_type == AVMEDIA_TYPE_VIDEO && height_in_as)
351  avio_printf(s->pb, " height=\"%d\"", codec->height);
352  if (codec->codec_type == AVMEDIA_TYPE_AUDIO && sample_rate_in_as)
353  avio_printf(s->pb, " audioSamplingRate=\"%d\"", codec->sample_rate);
354 
355  avio_printf(s->pb, " bitstreamSwitching=\"%s\"",
356  boolean[bitstream_switching(s, as)]);
357  avio_printf(s->pb, " subsegmentAlignment=\"%s\"",
358  boolean[w->is_live || subsegment_alignment(s, as)]);
359 
360  for (i = 0; i < as->nb_streams; i++) {
362  CLUSTER_KEYFRAME, NULL, 0);
363  if (!w->is_live && (!kf || !strncmp(kf->value, "0", 1))) subsegmentStartsWithSAP = 0;
364  }
365  avio_printf(s->pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
366  avio_printf(s->pb, ">\n");
367 
368  if (w->is_live) {
369  AVDictionaryEntry *filename =
370  av_dict_get(s->streams[as->streams[0]]->metadata, FILENAME, NULL, 0);
371  char *initialization_pattern = NULL;
372  char *media_pattern = NULL;
373  int ret = parse_filename(filename->value, NULL, &initialization_pattern,
374  &media_pattern);
375  if (ret) return ret;
376  avio_printf(s->pb, "<ContentComponent id=\"1\" type=\"%s\"/>\n",
377  codec->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
378  avio_printf(s->pb, "<SegmentTemplate");
379  avio_printf(s->pb, " timescale=\"1000\"");
380  avio_printf(s->pb, " duration=\"%d\"", w->chunk_duration);
381  avio_printf(s->pb, " media=\"%s\"", media_pattern);
382  avio_printf(s->pb, " startNumber=\"%d\"", w->chunk_start_index);
383  avio_printf(s->pb, " initialization=\"%s\"", initialization_pattern);
384  avio_printf(s->pb, "/>\n");
385  av_free(initialization_pattern);
386  av_free(media_pattern);
387  }
388 
389  for (i = 0; i < as->nb_streams; i++) {
390  char *representation_id = NULL;
391  int ret;
392  if (w->is_live) {
393  AVDictionaryEntry *filename =
394  av_dict_get(s->streams[as->streams[i]]->metadata, FILENAME, NULL, 0);
395  if (!filename ||
396  (ret = parse_filename(filename->value, &representation_id, NULL, NULL))) {
397  return ret;
398  }
399  } else {
400  representation_id = av_asprintf("%d", w->representation_id++);
401  if (!representation_id) return AVERROR(ENOMEM);
402  }
403  ret = write_representation(s, s->streams[as->streams[i]],
404  representation_id, !width_in_as,
405  !height_in_as, !sample_rate_in_as);
406  av_free(representation_id);
407  if (ret) return ret;
408  }
409  avio_printf(s->pb, "</AdaptationSet>\n");
410  return 0;
411 }
412 
413 static int to_integer(char *p, int len)
414 {
415  int ret;
416  char *q = av_malloc(sizeof(char) * len);
417  if (!q)
418  return AVERROR(ENOMEM);
419  av_strlcpy(q, p, len);
420  ret = atoi(q);
421  av_free(q);
422  return ret;
423 }
424 
426 {
428  char *p = w->adaptation_sets;
429  char *q;
430  enum { new_set, parsed_id, parsing_streams } state;
431  // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
432  state = new_set;
433  while (p < w->adaptation_sets + strlen(w->adaptation_sets)) {
434  if (*p == ' ')
435  continue;
436  else if (state == new_set && !strncmp(p, "id=", 3)) {
437  void *mem = av_realloc(w->as, sizeof(*w->as) * (w->nb_as + 1));
438  if (mem == NULL)
439  return AVERROR(ENOMEM);
440  w->as = mem;
441  ++w->nb_as;
442  w->as[w->nb_as - 1].nb_streams = 0;
443  w->as[w->nb_as - 1].streams = NULL;
444  p += 3; // consume "id="
445  q = w->as[w->nb_as - 1].id;
446  while (*p != ',') *q++ = *p++;
447  *q = 0;
448  p++;
449  state = parsed_id;
450  } else if (state == parsed_id && !strncmp(p, "streams=", 8)) {
451  p += 8; // consume "streams="
452  state = parsing_streams;
453  } else if (state == parsing_streams) {
454  struct AdaptationSet *as = &w->as[w->nb_as - 1];
455  q = p;
456  while (*q != '\0' && *q != ',' && *q != ' ') q++;
457  as->streams = av_realloc(as->streams, sizeof(*as->streams) * ++as->nb_streams);
458  if (as->streams == NULL)
459  return AVERROR(ENOMEM);
460  as->streams[as->nb_streams - 1] = to_integer(p, q - p + 1);
461  if (as->streams[as->nb_streams - 1] < 0) return -1;
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  ret = parse_adaptation_sets(s);
479  if (ret < 0) {
480  goto fail;
481  }
482  ret = write_header(s);
483  if (ret < 0) {
484  goto fail;
485  }
486  avio_printf(s->pb, "<Period id=\"0\"");
487  avio_printf(s->pb, " start=\"PT%gS\"", start);
488  if (!w->is_live) {
489  avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
490  }
491  avio_printf(s->pb, " >\n");
492 
493  for (i = 0; i < w->nb_as; i++) {
494  ret = write_adaptation_set(s, i);
495  if (ret < 0) {
496  goto fail;
497  }
498  }
499 
500  avio_printf(s->pb, "</Period>\n");
501  write_footer(s);
502 fail:
504  return ret < 0 ? ret : 0;
505 }
506 
508 {
509  return AVERROR_EOF;
510 }
511 
513 {
515  return 0;
516 }
517 
518 #define OFFSET(x) offsetof(WebMDashMuxContext, x)
519 static const AVOption options[] = {
520  { "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 },
521  { "debug_mode", "[private option - users should never set this]. set this to 1 to create deterministic output", OFFSET(debug_mode), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
522  { "live", "set this to 1 to create a live stream manifest", OFFSET(is_live), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
523  { "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 },
524  { "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 },
525  { "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 },
526  { "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 },
527  { "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 },
528  { NULL },
529 };
530 
531 #if CONFIG_WEBM_DASH_MANIFEST_MUXER
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 
539 AVOutputFormat ff_webm_dash_manifest_muxer = {
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),
548  .priv_class = &webm_dash_class,
549 };
550 #endif
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVOption.
Definition: opt.h:255
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
#define INITIALIZATION_RANGE
Definition: matroska.h:289
char * av_stristr(const char *s1, const char *s2)
Locate the first case-independent occurrence in the string haystack of the string needle...
Definition: avstring.c:56
static int subsegment_alignment(AVFormatContext *s, AdaptationSet *as)
Definition: webmdashenc.c:138
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1272
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 mem
Definition: avisynth_c.h:684
#define av_malloc(s)
AVOptions.
#define TRACK_NUMBER
Definition: matroska.h:297
AdaptationSet * as
Definition: webmdashenc.c:51
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1355
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1340
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:39
#define AVERROR_EOF
End of file.
Definition: error.h:55
static int64_t duration
Definition: ffplay.c:321
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:285
#define FILENAME
Definition: matroska.h:292
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
static const AVOption options[]
Definition: webmdashenc.c:519
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: webmdashenc.c:507
enum AVCodecID codec_id
Definition: mov_chan.c:433
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
static int check_matching_sample_rate(AVFormatContext *s, AdaptationSet *as)
Definition: webmdashenc.c:250
static struct tm * gmtime_r(const time_t *clock, struct tm *result)
Definition: time_internal.h:26
static int webm_dash_manifest_write_header(AVFormatContext *s)
Definition: webmdashenc.c:472
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1328
static int write_header(AVFormatContext *s)
Definition: webmdashenc.c:91
static int webm_dash_manifest_write_trailer(AVFormatContext *s)
Definition: webmdashenc.c:512
double time_shift_buffer_depth
Definition: webmdashenc.c:58
#define OFFSET(x)
Definition: webmdashenc.c:518
static void write_footer(AVFormatContext *s)
Definition: webmdashenc.c:133
ret
Definition: avfilter.c:974
int width
picture width / height.
Definition: avcodec.h:1414
char * adaptation_sets
Definition: webmdashenc.c:50
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
#define CLUSTER_KEYFRAME
Definition: matroska.h:295
const char * name
Definition: avformat.h:513
static double get_duration(AVFormatContext *s)
Definition: webmdashenc.c:78
#define DURATION
Definition: matroska.h:294
static const char * get_codec_name(int codec_id)
Definition: webmdashenc.c:63
AVDictionary * metadata
Definition: avformat.h:916
static int to_integer(char *p, int len)
Definition: webmdashenc.c:413
char id[10]
Definition: webmdashenc.c:43
Stream structure.
Definition: avformat.h:842
#define CUES_END
Definition: matroska.h:291
enum AVMediaType codec_type
Definition: avcodec.h:1249
enum AVCodecID codec_id
Definition: avcodec.h:1258
#define BANDWIDTH
Definition: matroska.h:293
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:265
int sample_rate
samples per second
Definition: avcodec.h:1985
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
main external API structure.
Definition: avcodec.h:1241
#define CUE_TIMESTAMPS
Definition: matroska.h:296
static const AVClass webm_dash_class
Definition: matroskadec.c:3468
int extradata_size
Definition: avcodec.h:1356
Describe the class of an AVClass context structure.
Definition: log.h:67
static int parse_filename(char *filename, char **representation_id, char **initialization_pattern, char **media_pattern)
Definition: webmdashenc.c:280
static int check_matching_height(AVFormatContext *s, AdaptationSet *as)
Definition: webmdashenc.c:237
static void free_adaptation_sets(AVFormatContext *s)
Definition: webmdashenc.c:260
static uint32_t state
Definition: trasher.c:27
Main libavformat public API header.
void * av_realloc(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:143
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
#define av_free(p)
char * value
Definition: dict.h:88
int len
void * priv_data
Format private data.
Definition: avformat.h:1300
static int write_adaptation_set(AVFormatContext *s, int as_index)
Definition: webmdashenc.c:318
static int bitstream_switching(AVFormatContext *s, AdaptationSet *as)
Definition: webmdashenc.c:151
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:553
static int parse_adaptation_sets(AVFormatContext *s)
Definition: webmdashenc.c:425
static int check_matching_width(AVFormatContext *s, AdaptationSet *as)
Definition: webmdashenc.c:224
#define CUES_START
Definition: matroska.h:290
This structure stores compressed data.
Definition: avcodec.h:1139
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:86
static int write_representation(AVFormatContext *s, AVStream *stream, char *id, int output_width, int output_height, int output_sample_rate)
Definition: webmdashenc.c:176
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2