FFmpeg
hls.c
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1 /*
2  * Apple HTTP Live Streaming demuxer
3  * Copyright (c) 2010 Martin Storsjo
4  * Copyright (c) 2013 Anssi Hannula
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * Apple HTTP Live Streaming demuxer
26  * http://tools.ietf.org/html/draft-pantos-http-live-streaming
27  */
28 
29 #include "libavformat/http.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/avassert.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/dict.h"
36 #include "libavutil/time.h"
37 #include "avformat.h"
38 #include "internal.h"
39 #include "avio_internal.h"
40 #include "id3v2.h"
41 
42 #define INITIAL_BUFFER_SIZE 32768
43 
44 #define MAX_FIELD_LEN 64
45 #define MAX_CHARACTERISTICS_LEN 512
46 
47 #define MPEG_TIME_BASE 90000
48 #define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
49 
50 /*
51  * An apple http stream consists of a playlist with media segment files,
52  * played sequentially. There may be several playlists with the same
53  * video content, in different bandwidth variants, that are played in
54  * parallel (preferably only one bandwidth variant at a time). In this case,
55  * the user supplied the url to a main playlist that only lists the variant
56  * playlists.
57  *
58  * If the main playlist doesn't point at any variants, we still create
59  * one anonymous toplevel variant for this, to maintain the structure.
60  */
61 
62 enum KeyType {
66 };
67 
68 struct segment {
69  int64_t duration;
70  int64_t url_offset;
71  int64_t size;
72  char *url;
73  char *key;
75  uint8_t iv[16];
76  /* associated Media Initialization Section, treated as a segment */
78 };
79 
80 struct rendition;
81 
86 };
87 
88 /*
89  * Each playlist has its own demuxer. If it currently is active,
90  * it has an open AVIOContext too, and potentially an AVPacket
91  * containing the next packet from this stream.
92  */
93 struct playlist {
102  int index;
106 
107  /* main demuxer streams associated with this playlist
108  * indexed by the subdemuxer stream indexes */
111 
112  int finished;
117  struct segment **segments;
118  int needed;
120  int64_t cur_seg_offset;
121  int64_t last_load_time;
122 
123  /* Currently active Media Initialization Section */
126  unsigned int init_sec_buf_size;
127  unsigned int init_sec_data_len;
129 
130  char key_url[MAX_URL_SIZE];
132 
133  /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
134  * (and possibly other ID3 tags) in the beginning of each segment) */
135  int is_id3_timestamped; /* -1: not yet known */
136  int64_t id3_mpegts_timestamp; /* in mpegts tb */
137  int64_t id3_offset; /* in stream original tb */
138  uint8_t* id3_buf; /* temp buffer for id3 parsing */
139  unsigned int id3_buf_size;
140  AVDictionary *id3_initial; /* data from first id3 tag */
141  int id3_found; /* ID3 tag found at some point */
142  int id3_changed; /* ID3 tag data has changed at some point */
143  ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
144 
145  int64_t seek_timestamp;
147  int seek_stream_index; /* into subdemuxer stream array */
148 
149  /* Renditions associated with this playlist, if any.
150  * Alternative rendition playlists have a single rendition associated
151  * with them, and variant main Media Playlists may have
152  * multiple (playlist-less) renditions associated with them. */
155 
156  /* Media Initialization Sections (EXT-X-MAP) associated with this
157  * playlist, if any. */
160 };
161 
162 /*
163  * Renditions are e.g. alternative subtitle or audio streams.
164  * The rendition may either be an external playlist or it may be
165  * contained in the main Media Playlist of the variant (in which case
166  * playlist is NULL).
167  */
168 struct rendition {
171  char group_id[MAX_FIELD_LEN];
175 };
176 
177 struct variant {
179 
180  /* every variant contains at least the main Media Playlist in index 0 */
182  struct playlist **playlists;
183 
184  char audio_group[MAX_FIELD_LEN];
185  char video_group[MAX_FIELD_LEN];
186  char subtitles_group[MAX_FIELD_LEN];
187 };
188 
189 typedef struct HLSContext {
190  AVClass *class;
193  struct variant **variants;
195  struct playlist **playlists;
198 
203  int64_t cur_timestamp;
211 } HLSContext;
212 
213 static void free_segment_dynarray(struct segment **segments, int n_segments)
214 {
215  int i;
216  for (i = 0; i < n_segments; i++) {
217  av_freep(&segments[i]->key);
218  av_freep(&segments[i]->url);
219  av_freep(&segments[i]);
220  }
221 }
222 
223 static void free_segment_list(struct playlist *pls)
224 {
226  av_freep(&pls->segments);
227  pls->n_segments = 0;
228 }
229 
230 static void free_init_section_list(struct playlist *pls)
231 {
232  int i;
233  for (i = 0; i < pls->n_init_sections; i++) {
234  av_freep(&pls->init_sections[i]->url);
235  av_freep(&pls->init_sections[i]);
236  }
237  av_freep(&pls->init_sections);
238  pls->n_init_sections = 0;
239 }
240 
242 {
243  int i;
244  for (i = 0; i < c->n_playlists; i++) {
245  struct playlist *pls = c->playlists[i];
246  free_segment_list(pls);
248  av_freep(&pls->main_streams);
249  av_freep(&pls->renditions);
250  av_freep(&pls->id3_buf);
251  av_dict_free(&pls->id3_initial);
253  av_freep(&pls->init_sec_buf);
254  av_packet_unref(&pls->pkt);
255  av_freep(&pls->pb.buffer);
256  if (pls->input)
257  ff_format_io_close(c->ctx, &pls->input);
258  pls->input_read_done = 0;
259  if (pls->input_next)
260  ff_format_io_close(c->ctx, &pls->input_next);
261  pls->input_next_requested = 0;
262  if (pls->ctx) {
263  pls->ctx->pb = NULL;
264  avformat_close_input(&pls->ctx);
265  }
266  av_free(pls);
267  }
268  av_freep(&c->playlists);
269  c->n_playlists = 0;
270 }
271 
273 {
274  int i;
275  for (i = 0; i < c->n_variants; i++) {
276  struct variant *var = c->variants[i];
277  av_freep(&var->playlists);
278  av_free(var);
279  }
280  av_freep(&c->variants);
281  c->n_variants = 0;
282 }
283 
285 {
286  int i;
287  for (i = 0; i < c->n_renditions; i++)
288  av_freep(&c->renditions[i]);
289  av_freep(&c->renditions);
290  c->n_renditions = 0;
291 }
292 
293 /*
294  * Used to reset a statically allocated AVPacket to a clean state,
295  * containing no data.
296  */
297 static void reset_packet(AVPacket *pkt)
298 {
299  av_init_packet(pkt);
300  pkt->data = NULL;
301 }
302 
303 static struct playlist *new_playlist(HLSContext *c, const char *url,
304  const char *base)
305 {
306  struct playlist *pls = av_mallocz(sizeof(struct playlist));
307  if (!pls)
308  return NULL;
309  reset_packet(&pls->pkt);
310  ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
312 
313  pls->is_id3_timestamped = -1;
315 
316  dynarray_add(&c->playlists, &c->n_playlists, pls);
317  return pls;
318 }
319 
320 struct variant_info {
321  char bandwidth[20];
322  /* variant group ids: */
323  char audio[MAX_FIELD_LEN];
325  char subtitles[MAX_FIELD_LEN];
326 };
327 
328 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
329  const char *url, const char *base)
330 {
331  struct variant *var;
332  struct playlist *pls;
333 
334  pls = new_playlist(c, url, base);
335  if (!pls)
336  return NULL;
337 
338  var = av_mallocz(sizeof(struct variant));
339  if (!var)
340  return NULL;
341 
342  if (info) {
343  var->bandwidth = atoi(info->bandwidth);
344  strcpy(var->audio_group, info->audio);
345  strcpy(var->video_group, info->video);
346  strcpy(var->subtitles_group, info->subtitles);
347  }
348 
349  dynarray_add(&c->variants, &c->n_variants, var);
350  dynarray_add(&var->playlists, &var->n_playlists, pls);
351  return var;
352 }
353 
354 static void handle_variant_args(struct variant_info *info, const char *key,
355  int key_len, char **dest, int *dest_len)
356 {
357  if (!strncmp(key, "BANDWIDTH=", key_len)) {
358  *dest = info->bandwidth;
359  *dest_len = sizeof(info->bandwidth);
360  } else if (!strncmp(key, "AUDIO=", key_len)) {
361  *dest = info->audio;
362  *dest_len = sizeof(info->audio);
363  } else if (!strncmp(key, "VIDEO=", key_len)) {
364  *dest = info->video;
365  *dest_len = sizeof(info->video);
366  } else if (!strncmp(key, "SUBTITLES=", key_len)) {
367  *dest = info->subtitles;
368  *dest_len = sizeof(info->subtitles);
369  }
370 }
371 
372 struct key_info {
373  char uri[MAX_URL_SIZE];
374  char method[11];
375  char iv[35];
376 };
377 
378 static void handle_key_args(struct key_info *info, const char *key,
379  int key_len, char **dest, int *dest_len)
380 {
381  if (!strncmp(key, "METHOD=", key_len)) {
382  *dest = info->method;
383  *dest_len = sizeof(info->method);
384  } else if (!strncmp(key, "URI=", key_len)) {
385  *dest = info->uri;
386  *dest_len = sizeof(info->uri);
387  } else if (!strncmp(key, "IV=", key_len)) {
388  *dest = info->iv;
389  *dest_len = sizeof(info->iv);
390  }
391 }
392 
394  char uri[MAX_URL_SIZE];
395  char byterange[32];
396 };
397 
398 static struct segment *new_init_section(struct playlist *pls,
399  struct init_section_info *info,
400  const char *url_base)
401 {
402  struct segment *sec;
403  char *ptr;
404  char tmp_str[MAX_URL_SIZE];
405 
406  if (!info->uri[0])
407  return NULL;
408 
409  sec = av_mallocz(sizeof(*sec));
410  if (!sec)
411  return NULL;
412 
413  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
414  sec->url = av_strdup(tmp_str);
415  if (!sec->url) {
416  av_free(sec);
417  return NULL;
418  }
419 
420  if (info->byterange[0]) {
421  sec->size = strtoll(info->byterange, NULL, 10);
422  ptr = strchr(info->byterange, '@');
423  if (ptr)
424  sec->url_offset = strtoll(ptr+1, NULL, 10);
425  } else {
426  /* the entire file is the init section */
427  sec->size = -1;
428  }
429 
430  dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
431 
432  return sec;
433 }
434 
435 static void handle_init_section_args(struct init_section_info *info, const char *key,
436  int key_len, char **dest, int *dest_len)
437 {
438  if (!strncmp(key, "URI=", key_len)) {
439  *dest = info->uri;
440  *dest_len = sizeof(info->uri);
441  } else if (!strncmp(key, "BYTERANGE=", key_len)) {
442  *dest = info->byterange;
443  *dest_len = sizeof(info->byterange);
444  }
445 }
446 
448  char type[16];
449  char uri[MAX_URL_SIZE];
450  char group_id[MAX_FIELD_LEN];
452  char assoc_language[MAX_FIELD_LEN];
454  char defaultr[4];
455  char forced[4];
456  char characteristics[MAX_CHARACTERISTICS_LEN];
457 };
458 
460  const char *url_base)
461 {
462  struct rendition *rend;
464  char *characteristic;
465  char *chr_ptr;
466  char *saveptr;
467 
468  if (!strcmp(info->type, "AUDIO"))
469  type = AVMEDIA_TYPE_AUDIO;
470  else if (!strcmp(info->type, "VIDEO"))
471  type = AVMEDIA_TYPE_VIDEO;
472  else if (!strcmp(info->type, "SUBTITLES"))
473  type = AVMEDIA_TYPE_SUBTITLE;
474  else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
475  /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
476  * AVC SEI RBSP anyway */
477  return NULL;
478 
479  if (type == AVMEDIA_TYPE_UNKNOWN) {
480  av_log(c, AV_LOG_WARNING, "Can't support the type: %s\n", info->type);
481  return NULL;
482  }
483 
484  /* URI is mandatory for subtitles as per spec */
485  if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) {
486  av_log(c, AV_LOG_ERROR, "The URI tag is REQUIRED for subtitle.\n");
487  return NULL;
488  }
489 
490  /* TODO: handle subtitles (each segment has to parsed separately) */
492  if (type == AVMEDIA_TYPE_SUBTITLE) {
493  av_log(c, AV_LOG_WARNING, "Can't support the subtitle(uri: %s)\n", info->uri);
494  return NULL;
495  }
496 
497  rend = av_mallocz(sizeof(struct rendition));
498  if (!rend)
499  return NULL;
500 
501  dynarray_add(&c->renditions, &c->n_renditions, rend);
502 
503  rend->type = type;
504  strcpy(rend->group_id, info->group_id);
505  strcpy(rend->language, info->language);
506  strcpy(rend->name, info->name);
507 
508  /* add the playlist if this is an external rendition */
509  if (info->uri[0]) {
510  rend->playlist = new_playlist(c, info->uri, url_base);
511  if (rend->playlist)
513  &rend->playlist->n_renditions, rend);
514  }
515 
516  if (info->assoc_language[0]) {
517  int langlen = strlen(rend->language);
518  if (langlen < sizeof(rend->language) - 3) {
519  rend->language[langlen] = ',';
520  strncpy(rend->language + langlen + 1, info->assoc_language,
521  sizeof(rend->language) - langlen - 2);
522  }
523  }
524 
525  if (!strcmp(info->defaultr, "YES"))
527  if (!strcmp(info->forced, "YES"))
529 
530  chr_ptr = info->characteristics;
531  while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
532  if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
534  else if (!strcmp(characteristic, "public.accessibility.describes-video"))
536 
537  chr_ptr = NULL;
538  }
539 
540  return rend;
541 }
542 
543 static void handle_rendition_args(struct rendition_info *info, const char *key,
544  int key_len, char **dest, int *dest_len)
545 {
546  if (!strncmp(key, "TYPE=", key_len)) {
547  *dest = info->type;
548  *dest_len = sizeof(info->type);
549  } else if (!strncmp(key, "URI=", key_len)) {
550  *dest = info->uri;
551  *dest_len = sizeof(info->uri);
552  } else if (!strncmp(key, "GROUP-ID=", key_len)) {
553  *dest = info->group_id;
554  *dest_len = sizeof(info->group_id);
555  } else if (!strncmp(key, "LANGUAGE=", key_len)) {
556  *dest = info->language;
557  *dest_len = sizeof(info->language);
558  } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
559  *dest = info->assoc_language;
560  *dest_len = sizeof(info->assoc_language);
561  } else if (!strncmp(key, "NAME=", key_len)) {
562  *dest = info->name;
563  *dest_len = sizeof(info->name);
564  } else if (!strncmp(key, "DEFAULT=", key_len)) {
565  *dest = info->defaultr;
566  *dest_len = sizeof(info->defaultr);
567  } else if (!strncmp(key, "FORCED=", key_len)) {
568  *dest = info->forced;
569  *dest_len = sizeof(info->forced);
570  } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
571  *dest = info->characteristics;
572  *dest_len = sizeof(info->characteristics);
573  }
574  /*
575  * ignored:
576  * - AUTOSELECT: client may autoselect based on e.g. system language
577  * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
578  */
579 }
580 
581 /* used by parse_playlist to allocate a new variant+playlist when the
582  * playlist is detected to be a Media Playlist (not Master Playlist)
583  * and we have no parent Master Playlist (parsing of which would have
584  * allocated the variant and playlist already)
585  * *pls == NULL => Master Playlist or parentless Media Playlist
586  * *pls != NULL => parented Media Playlist, playlist+variant allocated */
587 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
588 {
589  if (*pls)
590  return 0;
591  if (!new_variant(c, NULL, url, NULL))
592  return AVERROR(ENOMEM);
593  *pls = c->playlists[c->n_playlists - 1];
594  return 0;
595 }
596 
598  const char *url)
599 {
600 #if !CONFIG_HTTP_PROTOCOL
602 #else
603  int ret;
604  URLContext *uc = ffio_geturlcontext(*pb);
605  av_assert0(uc);
606  (*pb)->eof_reached = 0;
607  ret = ff_http_do_new_request(uc, url);
608  if (ret < 0) {
609  ff_format_io_close(s, pb);
610  }
611  return ret;
612 #endif
613 }
614 
615 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
616  AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
617 {
618  HLSContext *c = s->priv_data;
619  AVDictionary *tmp = NULL;
620  const char *proto_name = NULL;
621  int ret;
622  int is_http = 0;
623 
624  av_dict_copy(&tmp, opts, 0);
625  av_dict_copy(&tmp, opts2, 0);
626 
627  if (av_strstart(url, "crypto", NULL)) {
628  if (url[6] == '+' || url[6] == ':')
629  proto_name = avio_find_protocol_name(url + 7);
630  }
631 
632  if (!proto_name)
633  proto_name = avio_find_protocol_name(url);
634 
635  if (!proto_name)
636  return AVERROR_INVALIDDATA;
637 
638  // only http(s) & file are allowed
639  if (av_strstart(proto_name, "file", NULL)) {
640  if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
641  av_log(s, AV_LOG_ERROR,
642  "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
643  "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
644  url);
645  return AVERROR_INVALIDDATA;
646  }
647  } else if (av_strstart(proto_name, "http", NULL)) {
648  is_http = 1;
649  } else
650  return AVERROR_INVALIDDATA;
651 
652  if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
653  ;
654  else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
655  ;
656  else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
657  return AVERROR_INVALIDDATA;
658 
659  if (is_http && c->http_persistent && *pb) {
660  ret = open_url_keepalive(c->ctx, pb, url);
661  if (ret == AVERROR_EXIT) {
662  return ret;
663  } else if (ret < 0) {
664  if (ret != AVERROR_EOF)
666  "keepalive request failed for '%s' when opening url, retrying with new connection: %s\n",
667  url, av_err2str(ret));
668  ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
669  }
670  } else {
671  ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
672  }
673  if (ret >= 0) {
674  // update cookies on http response with setcookies.
675  char *new_cookies = NULL;
676 
677  if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
678  av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
679 
680  if (new_cookies)
681  av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
682  }
683 
684  av_dict_free(&tmp);
685 
686  if (is_http_out)
687  *is_http_out = is_http;
688 
689  return ret;
690 }
691 
692 static int parse_playlist(HLSContext *c, const char *url,
693  struct playlist *pls, AVIOContext *in)
694 {
695  int ret = 0, is_segment = 0, is_variant = 0;
696  int64_t duration = 0;
697  enum KeyType key_type = KEY_NONE;
698  uint8_t iv[16] = "";
699  int has_iv = 0;
700  char key[MAX_URL_SIZE] = "";
701  char line[MAX_URL_SIZE];
702  const char *ptr;
703  int close_in = 0;
704  int64_t seg_offset = 0;
705  int64_t seg_size = -1;
706  uint8_t *new_url = NULL;
707  struct variant_info variant_info;
708  char tmp_str[MAX_URL_SIZE];
709  struct segment *cur_init_section = NULL;
710  int is_http = av_strstart(url, "http", NULL);
711  struct segment **prev_segments = NULL;
712  int prev_n_segments = 0;
713  int prev_start_seq_no = -1;
714 
715  if (is_http && !in && c->http_persistent && c->playlist_pb) {
716  in = c->playlist_pb;
717  ret = open_url_keepalive(c->ctx, &c->playlist_pb, url);
718  if (ret == AVERROR_EXIT) {
719  return ret;
720  } else if (ret < 0) {
721  if (ret != AVERROR_EOF)
723  "keepalive request failed for '%s' when parsing playlist, retrying with new connection: %s\n",
724  url, av_err2str(ret));
725  in = NULL;
726  }
727  }
728 
729  if (!in) {
731  av_dict_copy(&opts, c->avio_opts, 0);
732 
733  if (c->http_persistent)
734  av_dict_set(&opts, "multiple_requests", "1", 0);
735 
736  ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
737  av_dict_free(&opts);
738  if (ret < 0)
739  return ret;
740 
741  if (is_http && c->http_persistent)
742  c->playlist_pb = in;
743  else
744  close_in = 1;
745  }
746 
747  if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
748  url = new_url;
749 
750  ff_get_chomp_line(in, line, sizeof(line));
751  if (strcmp(line, "#EXTM3U")) {
752  ret = AVERROR_INVALIDDATA;
753  goto fail;
754  }
755 
756  if (pls) {
757  prev_start_seq_no = pls->start_seq_no;
758  prev_segments = pls->segments;
759  prev_n_segments = pls->n_segments;
760  pls->segments = NULL;
761  pls->n_segments = 0;
762 
763  pls->finished = 0;
764  pls->type = PLS_TYPE_UNSPECIFIED;
765  }
766  while (!avio_feof(in)) {
767  ff_get_chomp_line(in, line, sizeof(line));
768  if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
769  is_variant = 1;
770  memset(&variant_info, 0, sizeof(variant_info));
772  &variant_info);
773  } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
774  struct key_info info = {{0}};
776  &info);
777  key_type = KEY_NONE;
778  has_iv = 0;
779  if (!strcmp(info.method, "AES-128"))
780  key_type = KEY_AES_128;
781  if (!strcmp(info.method, "SAMPLE-AES"))
782  key_type = KEY_SAMPLE_AES;
783  if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
784  ff_hex_to_data(iv, info.iv + 2);
785  has_iv = 1;
786  }
787  av_strlcpy(key, info.uri, sizeof(key));
788  } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
789  struct rendition_info info = {{0}};
791  &info);
792  new_rendition(c, &info, url);
793  } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
794  ret = ensure_playlist(c, &pls, url);
795  if (ret < 0)
796  goto fail;
797  pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
798  } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
799  ret = ensure_playlist(c, &pls, url);
800  if (ret < 0)
801  goto fail;
802  pls->start_seq_no = atoi(ptr);
803  } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
804  ret = ensure_playlist(c, &pls, url);
805  if (ret < 0)
806  goto fail;
807  if (!strcmp(ptr, "EVENT"))
808  pls->type = PLS_TYPE_EVENT;
809  else if (!strcmp(ptr, "VOD"))
810  pls->type = PLS_TYPE_VOD;
811  } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
812  struct init_section_info info = {{0}};
813  ret = ensure_playlist(c, &pls, url);
814  if (ret < 0)
815  goto fail;
817  &info);
818  cur_init_section = new_init_section(pls, &info, url);
819  cur_init_section->key_type = key_type;
820  if (has_iv) {
821  memcpy(cur_init_section->iv, iv, sizeof(iv));
822  } else {
823  int seq = pls->start_seq_no + pls->n_segments;
824  memset(cur_init_section->iv, 0, sizeof(cur_init_section->iv));
825  AV_WB32(cur_init_section->iv + 12, seq);
826  }
827 
828  if (key_type != KEY_NONE) {
829  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
830  cur_init_section->key = av_strdup(tmp_str);
831  if (!cur_init_section->key) {
832  av_free(cur_init_section);
833  ret = AVERROR(ENOMEM);
834  goto fail;
835  }
836  } else {
837  cur_init_section->key = NULL;
838  }
839 
840  } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
841  if (pls)
842  pls->finished = 1;
843  } else if (av_strstart(line, "#EXTINF:", &ptr)) {
844  is_segment = 1;
845  duration = atof(ptr) * AV_TIME_BASE;
846  } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
847  seg_size = strtoll(ptr, NULL, 10);
848  ptr = strchr(ptr, '@');
849  if (ptr)
850  seg_offset = strtoll(ptr+1, NULL, 10);
851  } else if (av_strstart(line, "#", NULL)) {
852  av_log(c->ctx, AV_LOG_INFO, "Skip ('%s')\n", line);
853  continue;
854  } else if (line[0]) {
855  if (is_variant) {
856  if (!new_variant(c, &variant_info, line, url)) {
857  ret = AVERROR(ENOMEM);
858  goto fail;
859  }
860  is_variant = 0;
861  }
862  if (is_segment) {
863  struct segment *seg;
864  if (!pls) {
865  if (!new_variant(c, 0, url, NULL)) {
866  ret = AVERROR(ENOMEM);
867  goto fail;
868  }
869  pls = c->playlists[c->n_playlists - 1];
870  }
871  seg = av_malloc(sizeof(struct segment));
872  if (!seg) {
873  ret = AVERROR(ENOMEM);
874  goto fail;
875  }
876  seg->duration = duration;
877  seg->key_type = key_type;
878  if (has_iv) {
879  memcpy(seg->iv, iv, sizeof(iv));
880  } else {
881  int seq = pls->start_seq_no + pls->n_segments;
882  memset(seg->iv, 0, sizeof(seg->iv));
883  AV_WB32(seg->iv + 12, seq);
884  }
885 
886  if (key_type != KEY_NONE) {
887  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
888  seg->key = av_strdup(tmp_str);
889  if (!seg->key) {
890  av_free(seg);
891  ret = AVERROR(ENOMEM);
892  goto fail;
893  }
894  } else {
895  seg->key = NULL;
896  }
897 
898  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
899  seg->url = av_strdup(tmp_str);
900  if (!seg->url) {
901  av_free(seg->key);
902  av_free(seg);
903  ret = AVERROR(ENOMEM);
904  goto fail;
905  }
906 
907  dynarray_add(&pls->segments, &pls->n_segments, seg);
908  is_segment = 0;
909 
910  seg->size = seg_size;
911  if (seg_size >= 0) {
912  seg->url_offset = seg_offset;
913  seg_offset += seg_size;
914  seg_size = -1;
915  } else {
916  seg->url_offset = 0;
917  seg_offset = 0;
918  }
919 
920  seg->init_section = cur_init_section;
921  }
922  }
923  }
924  if (prev_segments) {
925  if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
926  int64_t prev_timestamp = c->first_timestamp;
927  int i, diff = pls->start_seq_no - prev_start_seq_no;
928  for (i = 0; i < prev_n_segments && i < diff; i++) {
929  c->first_timestamp += prev_segments[i]->duration;
930  }
931  av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%d -> %d)"
932  " reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
933  prev_start_seq_no, pls->start_seq_no,
934  prev_timestamp, c->first_timestamp);
935  } else if (pls->start_seq_no < prev_start_seq_no) {
936  av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %d -> %d\n",
937  prev_start_seq_no, pls->start_seq_no);
938  }
939  free_segment_dynarray(prev_segments, prev_n_segments);
940  av_freep(&prev_segments);
941  }
942  if (pls)
944 
945 fail:
946  av_free(new_url);
947  if (close_in)
948  ff_format_io_close(c->ctx, &in);
949  c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
950  if (!c->n_variants || !c->variants[0]->n_playlists ||
951  !(c->variants[0]->playlists[0]->finished ||
952  c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
954  return ret;
955 }
956 
957 static struct segment *current_segment(struct playlist *pls)
958 {
959  return pls->segments[pls->cur_seq_no - pls->start_seq_no];
960 }
961 
962 static struct segment *next_segment(struct playlist *pls)
963 {
964  int n = pls->cur_seq_no - pls->start_seq_no + 1;
965  if (n >= pls->n_segments)
966  return NULL;
967  return pls->segments[n];
968 }
969 
970 static int read_from_url(struct playlist *pls, struct segment *seg,
971  uint8_t *buf, int buf_size)
972 {
973  int ret;
974 
975  /* limit read if the segment was only a part of a file */
976  if (seg->size >= 0)
977  buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
978 
979  ret = avio_read(pls->input, buf, buf_size);
980  if (ret > 0)
981  pls->cur_seg_offset += ret;
982 
983  return ret;
984 }
985 
986 /* Parse the raw ID3 data and pass contents to caller */
988  AVDictionary **metadata, int64_t *dts,
989  ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
990 {
991  static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
992  ID3v2ExtraMeta *meta;
993 
994  ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
995  for (meta = *extra_meta; meta; meta = meta->next) {
996  if (!strcmp(meta->tag, "PRIV")) {
997  ID3v2ExtraMetaPRIV *priv = meta->data;
998  if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
999  /* 33-bit MPEG timestamp */
1000  int64_t ts = AV_RB64(priv->data);
1001  av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
1002  if ((ts & ~((1ULL << 33) - 1)) == 0)
1003  *dts = ts;
1004  else
1005  av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
1006  }
1007  } else if (!strcmp(meta->tag, "APIC") && apic)
1008  *apic = meta->data;
1009  }
1010 }
1011 
1012 /* Check if the ID3 metadata contents have changed */
1013 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
1014  ID3v2ExtraMetaAPIC *apic)
1015 {
1016  AVDictionaryEntry *entry = NULL;
1017  AVDictionaryEntry *oldentry;
1018  /* check that no keys have changed values */
1019  while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
1020  oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
1021  if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
1022  return 1;
1023  }
1024 
1025  /* check if apic appeared */
1026  if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
1027  return 1;
1028 
1029  if (apic) {
1030  int size = pls->ctx->streams[1]->attached_pic.size;
1031  if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
1032  return 1;
1033 
1034  if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
1035  return 1;
1036  }
1037 
1038  return 0;
1039 }
1040 
1041 /* Parse ID3 data and handle the found data */
1042 static void handle_id3(AVIOContext *pb, struct playlist *pls)
1043 {
1044  AVDictionary *metadata = NULL;
1045  ID3v2ExtraMetaAPIC *apic = NULL;
1046  ID3v2ExtraMeta *extra_meta = NULL;
1047  int64_t timestamp = AV_NOPTS_VALUE;
1048 
1049  parse_id3(pls->ctx, pb, &metadata, &timestamp, &apic, &extra_meta);
1050 
1051  if (timestamp != AV_NOPTS_VALUE) {
1052  pls->id3_mpegts_timestamp = timestamp;
1053  pls->id3_offset = 0;
1054  }
1055 
1056  if (!pls->id3_found) {
1057  /* initial ID3 tags */
1059  pls->id3_found = 1;
1060 
1061  /* get picture attachment and set text metadata */
1062  if (pls->ctx->nb_streams)
1063  ff_id3v2_parse_apic(pls->ctx, &extra_meta);
1064  else
1065  /* demuxer not yet opened, defer picture attachment */
1066  pls->id3_deferred_extra = extra_meta;
1067 
1068  ff_id3v2_parse_priv_dict(&metadata, &extra_meta);
1069  av_dict_copy(&pls->ctx->metadata, metadata, 0);
1070  pls->id3_initial = metadata;
1071 
1072  } else {
1073  if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
1074  avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
1075  pls->id3_changed = 1;
1076  }
1077  av_dict_free(&metadata);
1078  }
1079 
1080  if (!pls->id3_deferred_extra)
1081  ff_id3v2_free_extra_meta(&extra_meta);
1082 }
1083 
1084 static void intercept_id3(struct playlist *pls, uint8_t *buf,
1085  int buf_size, int *len)
1086 {
1087  /* intercept id3 tags, we do not want to pass them to the raw
1088  * demuxer on all segment switches */
1089  int bytes;
1090  int id3_buf_pos = 0;
1091  int fill_buf = 0;
1092  struct segment *seg = current_segment(pls);
1093 
1094  /* gather all the id3 tags */
1095  while (1) {
1096  /* see if we can retrieve enough data for ID3 header */
1097  if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
1098  bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
1099  if (bytes > 0) {
1100 
1101  if (bytes == ID3v2_HEADER_SIZE - *len)
1102  /* no EOF yet, so fill the caller buffer again after
1103  * we have stripped the ID3 tags */
1104  fill_buf = 1;
1105 
1106  *len += bytes;
1107 
1108  } else if (*len <= 0) {
1109  /* error/EOF */
1110  *len = bytes;
1111  fill_buf = 0;
1112  }
1113  }
1114 
1115  if (*len < ID3v2_HEADER_SIZE)
1116  break;
1117 
1118  if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
1119  int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
1120  int taglen = ff_id3v2_tag_len(buf);
1121  int tag_got_bytes = FFMIN(taglen, *len);
1122  int remaining = taglen - tag_got_bytes;
1123 
1124  if (taglen > maxsize) {
1125  av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
1126  taglen, maxsize);
1127  break;
1128  }
1129 
1130  /*
1131  * Copy the id3 tag to our temporary id3 buffer.
1132  * We could read a small id3 tag directly without memcpy, but
1133  * we would still need to copy the large tags, and handling
1134  * both of those cases together with the possibility for multiple
1135  * tags would make the handling a bit complex.
1136  */
1137  pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
1138  if (!pls->id3_buf)
1139  break;
1140  memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
1141  id3_buf_pos += tag_got_bytes;
1142 
1143  /* strip the intercepted bytes */
1144  *len -= tag_got_bytes;
1145  memmove(buf, buf + tag_got_bytes, *len);
1146  av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
1147 
1148  if (remaining > 0) {
1149  /* read the rest of the tag in */
1150  if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
1151  break;
1152  id3_buf_pos += remaining;
1153  av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
1154  }
1155 
1156  } else {
1157  /* no more ID3 tags */
1158  break;
1159  }
1160  }
1161 
1162  /* re-fill buffer for the caller unless EOF */
1163  if (*len >= 0 && (fill_buf || *len == 0)) {
1164  bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
1165 
1166  /* ignore error if we already had some data */
1167  if (bytes >= 0)
1168  *len += bytes;
1169  else if (*len == 0)
1170  *len = bytes;
1171  }
1172 
1173  if (pls->id3_buf) {
1174  /* Now parse all the ID3 tags */
1175  AVIOContext id3ioctx;
1176  ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
1177  handle_id3(&id3ioctx, pls);
1178  }
1179 
1180  if (pls->is_id3_timestamped == -1)
1182 }
1183 
1184 static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
1185 {
1186  AVDictionary *opts = NULL;
1187  int ret;
1188  int is_http = 0;
1189 
1190  if (c->http_persistent)
1191  av_dict_set(&opts, "multiple_requests", "1", 0);
1192 
1193  if (seg->size >= 0) {
1194  /* try to restrict the HTTP request to the part we want
1195  * (if this is in fact a HTTP request) */
1196  av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1197  av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1198  }
1199 
1200  av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
1201  seg->url, seg->url_offset, pls->index);
1202 
1203  if (seg->key_type == KEY_NONE) {
1204  ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
1205  } else if (seg->key_type == KEY_AES_128) {
1206  char iv[33], key[33], url[MAX_URL_SIZE];
1207  if (strcmp(seg->key, pls->key_url)) {
1208  AVIOContext *pb = NULL;
1209  if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
1210  ret = avio_read(pb, pls->key, sizeof(pls->key));
1211  if (ret != sizeof(pls->key)) {
1212  av_log(pls->parent, AV_LOG_ERROR, "Unable to read key file %s\n",
1213  seg->key);
1214  }
1215  ff_format_io_close(pls->parent, &pb);
1216  } else {
1217  av_log(pls->parent, AV_LOG_ERROR, "Unable to open key file %s\n",
1218  seg->key);
1219  }
1220  av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
1221  }
1222  ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
1223  ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
1224  iv[32] = key[32] = '\0';
1225  if (strstr(seg->url, "://"))
1226  snprintf(url, sizeof(url), "crypto+%s", seg->url);
1227  else
1228  snprintf(url, sizeof(url), "crypto:%s", seg->url);
1229 
1230  av_dict_set(&opts, "key", key, 0);
1231  av_dict_set(&opts, "iv", iv, 0);
1232 
1233  ret = open_url(pls->parent, in, url, c->avio_opts, opts, &is_http);
1234  if (ret < 0) {
1235  goto cleanup;
1236  }
1237  ret = 0;
1238  } else if (seg->key_type == KEY_SAMPLE_AES) {
1239  av_log(pls->parent, AV_LOG_ERROR,
1240  "SAMPLE-AES encryption is not supported yet\n");
1241  ret = AVERROR_PATCHWELCOME;
1242  }
1243  else
1244  ret = AVERROR(ENOSYS);
1245 
1246  /* Seek to the requested position. If this was a HTTP request, the offset
1247  * should already be where want it to, but this allows e.g. local testing
1248  * without a HTTP server.
1249  *
1250  * This is not done for HTTP at all as avio_seek() does internal bookkeeping
1251  * of file offset which is out-of-sync with the actual offset when "offset"
1252  * AVOption is used with http protocol, causing the seek to not be a no-op
1253  * as would be expected. Wrong offset received from the server will not be
1254  * noticed without the call, though.
1255  */
1256  if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
1257  int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
1258  if (seekret < 0) {
1259  av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
1260  ret = seekret;
1261  ff_format_io_close(pls->parent, in);
1262  }
1263  }
1264 
1265 cleanup:
1266  av_dict_free(&opts);
1267  pls->cur_seg_offset = 0;
1268  return ret;
1269 }
1270 
1271 static int update_init_section(struct playlist *pls, struct segment *seg)
1272 {
1273  static const int max_init_section_size = 1024*1024;
1274  HLSContext *c = pls->parent->priv_data;
1275  int64_t sec_size;
1276  int64_t urlsize;
1277  int ret;
1278 
1279  if (seg->init_section == pls->cur_init_section)
1280  return 0;
1281 
1282  pls->cur_init_section = NULL;
1283 
1284  if (!seg->init_section)
1285  return 0;
1286 
1287  ret = open_input(c, pls, seg->init_section, &pls->input);
1288  if (ret < 0) {
1290  "Failed to open an initialization section in playlist %d\n",
1291  pls->index);
1292  return ret;
1293  }
1294 
1295  if (seg->init_section->size >= 0)
1296  sec_size = seg->init_section->size;
1297  else if ((urlsize = avio_size(pls->input)) >= 0)
1298  sec_size = urlsize;
1299  else
1300  sec_size = max_init_section_size;
1301 
1302  av_log(pls->parent, AV_LOG_DEBUG,
1303  "Downloading an initialization section of size %"PRId64"\n",
1304  sec_size);
1305 
1306  sec_size = FFMIN(sec_size, max_init_section_size);
1307 
1308  av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1309 
1310  ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
1311  pls->init_sec_buf_size);
1312  ff_format_io_close(pls->parent, &pls->input);
1313 
1314  if (ret < 0)
1315  return ret;
1316 
1317  pls->cur_init_section = seg->init_section;
1318  pls->init_sec_data_len = ret;
1319  pls->init_sec_buf_read_offset = 0;
1320 
1321  /* spec says audio elementary streams do not have media initialization
1322  * sections, so there should be no ID3 timestamps */
1323  pls->is_id3_timestamped = 0;
1324 
1325  return 0;
1326 }
1327 
1328 static int64_t default_reload_interval(struct playlist *pls)
1329 {
1330  return pls->n_segments > 0 ?
1331  pls->segments[pls->n_segments - 1]->duration :
1332  pls->target_duration;
1333 }
1334 
1335 static int playlist_needed(struct playlist *pls)
1336 {
1337  AVFormatContext *s = pls->parent;
1338  int i, j;
1339  int stream_needed = 0;
1340  int first_st;
1341 
1342  /* If there is no context or streams yet, the playlist is needed */
1343  if (!pls->ctx || !pls->n_main_streams)
1344  return 1;
1345 
1346  /* check if any of the streams in the playlist are needed */
1347  for (i = 0; i < pls->n_main_streams; i++) {
1348  if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
1349  stream_needed = 1;
1350  break;
1351  }
1352  }
1353 
1354  /* If all streams in the playlist were discarded, the playlist is not
1355  * needed (regardless of whether whole programs are discarded or not). */
1356  if (!stream_needed)
1357  return 0;
1358 
1359  /* Otherwise, check if all the programs (variants) this playlist is in are
1360  * discarded. Since all streams in the playlist are part of the same programs
1361  * we can just check the programs of the first stream. */
1362 
1363  first_st = pls->main_streams[0]->index;
1364 
1365  for (i = 0; i < s->nb_programs; i++) {
1366  AVProgram *program = s->programs[i];
1367  if (program->discard < AVDISCARD_ALL) {
1368  for (j = 0; j < program->nb_stream_indexes; j++) {
1369  if (program->stream_index[j] == first_st) {
1370  /* playlist is in an undiscarded program */
1371  return 1;
1372  }
1373  }
1374  }
1375  }
1376 
1377  /* some streams were not discarded but all the programs were */
1378  return 0;
1379 }
1380 
1381 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1382 {
1383  struct playlist *v = opaque;
1384  HLSContext *c = v->parent->priv_data;
1385  int ret;
1386  int just_opened = 0;
1387  int reload_count = 0;
1388  struct segment *seg;
1389 
1390 restart:
1391  if (!v->needed)
1392  return AVERROR_EOF;
1393 
1394  if (!v->input || (c->http_persistent && v->input_read_done)) {
1395  int64_t reload_interval;
1396 
1397  /* Check that the playlist is still needed before opening a new
1398  * segment. */
1399  v->needed = playlist_needed(v);
1400 
1401  if (!v->needed) {
1402  av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
1403  v->index, v->url);
1404  return AVERROR_EOF;
1405  }
1406 
1407  /* If this is a live stream and the reload interval has elapsed since
1408  * the last playlist reload, reload the playlists now. */
1409  reload_interval = default_reload_interval(v);
1410 
1411 reload:
1412  reload_count++;
1413  if (reload_count > c->max_reload)
1414  return AVERROR_EOF;
1415  if (!v->finished &&
1416  av_gettime_relative() - v->last_load_time >= reload_interval) {
1417  if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1418  if (ret != AVERROR_EXIT)
1419  av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1420  v->index);
1421  return ret;
1422  }
1423  /* If we need to reload the playlist again below (if
1424  * there's still no more segments), switch to a reload
1425  * interval of half the target duration. */
1426  reload_interval = v->target_duration / 2;
1427  }
1428  if (v->cur_seq_no < v->start_seq_no) {
1430  "skipping %d segments ahead, expired from playlists\n",
1431  v->start_seq_no - v->cur_seq_no);
1432  v->cur_seq_no = v->start_seq_no;
1433  }
1434  if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1435  if (v->finished)
1436  return AVERROR_EOF;
1437  while (av_gettime_relative() - v->last_load_time < reload_interval) {
1439  return AVERROR_EXIT;
1440  av_usleep(100*1000);
1441  }
1442  /* Enough time has elapsed since the last reload */
1443  goto reload;
1444  }
1445 
1446  v->input_read_done = 0;
1447  seg = current_segment(v);
1448 
1449  /* load/update Media Initialization Section, if any */
1450  ret = update_init_section(v, seg);
1451  if (ret)
1452  return ret;
1453 
1454  if (c->http_multiple == 1 && v->input_next_requested) {
1455  FFSWAP(AVIOContext *, v->input, v->input_next);
1456  v->input_next_requested = 0;
1457  ret = 0;
1458  } else {
1459  ret = open_input(c, v, seg, &v->input);
1460  }
1461  if (ret < 0) {
1463  return AVERROR_EXIT;
1464  av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
1465  v->cur_seq_no,
1466  v->index);
1467  v->cur_seq_no += 1;
1468  goto reload;
1469  }
1470  just_opened = 1;
1471  }
1472 
1473  if (c->http_multiple == -1) {
1474  uint8_t *http_version_opt = NULL;
1475  int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
1476  if (r >= 0) {
1477  c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
1478  av_freep(&http_version_opt);
1479  }
1480  }
1481 
1482  seg = next_segment(v);
1483  if (c->http_multiple == 1 && !v->input_next_requested &&
1484  seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1485  ret = open_input(c, v, seg, &v->input_next);
1486  if (ret < 0) {
1488  return AVERROR_EXIT;
1489  av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
1490  v->cur_seq_no + 1,
1491  v->index);
1492  } else {
1493  v->input_next_requested = 1;
1494  }
1495  }
1496 
1498  /* Push init section out first before first actual segment */
1499  int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1500  memcpy(buf, v->init_sec_buf, copy_size);
1501  v->init_sec_buf_read_offset += copy_size;
1502  return copy_size;
1503  }
1504 
1505  seg = current_segment(v);
1506  ret = read_from_url(v, seg, buf, buf_size);
1507  if (ret > 0) {
1508  if (just_opened && v->is_id3_timestamped != 0) {
1509  /* Intercept ID3 tags here, elementary audio streams are required
1510  * to convey timestamps using them in the beginning of each segment. */
1511  intercept_id3(v, buf, buf_size, &ret);
1512  }
1513 
1514  return ret;
1515  }
1516  if (c->http_persistent &&
1517  seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1518  v->input_read_done = 1;
1519  } else {
1520  ff_format_io_close(v->parent, &v->input);
1521  }
1522  v->cur_seq_no++;
1523 
1524  c->cur_seq_no = v->cur_seq_no;
1525 
1526  goto restart;
1527 }
1528 
1529 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1530  enum AVMediaType type, const char *group_id)
1531 {
1532  int i;
1533 
1534  for (i = 0; i < c->n_renditions; i++) {
1535  struct rendition *rend = c->renditions[i];
1536 
1537  if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1538 
1539  if (rend->playlist)
1540  /* rendition is an external playlist
1541  * => add the playlist to the variant */
1542  dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1543  else
1544  /* rendition is part of the variant main Media Playlist
1545  * => add the rendition to the main Media Playlist */
1546  dynarray_add(&var->playlists[0]->renditions,
1547  &var->playlists[0]->n_renditions,
1548  rend);
1549  }
1550  }
1551 }
1552 
1554  enum AVMediaType type)
1555 {
1556  int rend_idx = 0;
1557  int i;
1558 
1559  for (i = 0; i < pls->n_main_streams; i++) {
1560  AVStream *st = pls->main_streams[i];
1561 
1562  if (st->codecpar->codec_type != type)
1563  continue;
1564 
1565  for (; rend_idx < pls->n_renditions; rend_idx++) {
1566  struct rendition *rend = pls->renditions[rend_idx];
1567 
1568  if (rend->type != type)
1569  continue;
1570 
1571  if (rend->language[0])
1572  av_dict_set(&st->metadata, "language", rend->language, 0);
1573  if (rend->name[0])
1574  av_dict_set(&st->metadata, "comment", rend->name, 0);
1575 
1576  st->disposition |= rend->disposition;
1577  }
1578  if (rend_idx >=pls->n_renditions)
1579  break;
1580  }
1581 }
1582 
1583 /* if timestamp was in valid range: returns 1 and sets seq_no
1584  * if not: returns 0 and sets seq_no to closest segment */
1586  int64_t timestamp, int *seq_no)
1587 {
1588  int i;
1589  int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1590  0 : c->first_timestamp;
1591 
1592  if (timestamp < pos) {
1593  *seq_no = pls->start_seq_no;
1594  return 0;
1595  }
1596 
1597  for (i = 0; i < pls->n_segments; i++) {
1598  int64_t diff = pos + pls->segments[i]->duration - timestamp;
1599  if (diff > 0) {
1600  *seq_no = pls->start_seq_no + i;
1601  return 1;
1602  }
1603  pos += pls->segments[i]->duration;
1604  }
1605 
1606  *seq_no = pls->start_seq_no + pls->n_segments - 1;
1607 
1608  return 0;
1609 }
1610 
1611 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1612 {
1613  int seq_no;
1614 
1615  if (!pls->finished && !c->first_packet &&
1617  /* reload the playlist since it was suspended */
1618  parse_playlist(c, pls->url, pls, NULL);
1619 
1620  /* If playback is already in progress (we are just selecting a new
1621  * playlist) and this is a complete file, find the matching segment
1622  * by counting durations. */
1623  if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1624  find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1625  return seq_no;
1626  }
1627 
1628  if (!pls->finished) {
1629  if (!c->first_packet && /* we are doing a segment selection during playback */
1630  c->cur_seq_no >= pls->start_seq_no &&
1631  c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1632  /* While spec 3.4.3 says that we cannot assume anything about the
1633  * content at the same sequence number on different playlists,
1634  * in practice this seems to work and doing it otherwise would
1635  * require us to download a segment to inspect its timestamps. */
1636  return c->cur_seq_no;
1637 
1638  /* If this is a live stream, start live_start_index segments from the
1639  * start or end */
1640  if (c->live_start_index < 0)
1641  return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
1642  else
1643  return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
1644  }
1645 
1646  /* Otherwise just start on the first segment. */
1647  return pls->start_seq_no;
1648 }
1649 
1651 {
1652  HLSContext *c = s->priv_data;
1653  static const char * const opts[] = {
1654  "headers", "http_proxy", "user_agent", "cookies", "referer", "rw_timeout", NULL };
1655  const char * const * opt = opts;
1656  uint8_t *buf;
1657  int ret = 0;
1658 
1659  while (*opt) {
1660  if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
1661  ret = av_dict_set(&c->avio_opts, *opt, buf,
1663  if (ret < 0)
1664  return ret;
1665  }
1666  opt++;
1667  }
1668 
1669  return ret;
1670 }
1671 
1672 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1673  int flags, AVDictionary **opts)
1674 {
1675  av_log(s, AV_LOG_ERROR,
1676  "A HLS playlist item '%s' referred to an external file '%s'. "
1677  "Opening this file was forbidden for security reasons\n",
1678  s->url, url);
1679  return AVERROR(EPERM);
1680 }
1681 
1682 static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
1683 {
1684  HLSContext *c = s->priv_data;
1685  int i, j;
1686  int bandwidth = -1;
1687 
1688  for (i = 0; i < c->n_variants; i++) {
1689  struct variant *v = c->variants[i];
1690 
1691  for (j = 0; j < v->n_playlists; j++) {
1692  if (v->playlists[j] != pls)
1693  continue;
1694 
1695  av_program_add_stream_index(s, i, stream->index);
1696 
1697  if (bandwidth < 0)
1698  bandwidth = v->bandwidth;
1699  else if (bandwidth != v->bandwidth)
1700  bandwidth = -1; /* stream in multiple variants with different bandwidths */
1701  }
1702  }
1703 
1704  if (bandwidth >= 0)
1705  av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
1706 }
1707 
1709 {
1710  int err;
1711 
1712  err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
1713  if (err < 0)
1714  return err;
1715 
1716  if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1717  avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1718  else
1720 
1721  st->internal->need_context_update = 1;
1722 
1723  return 0;
1724 }
1725 
1726 /* add new subdemuxer streams to our context, if any */
1728 {
1729  int err;
1730 
1731  while (pls->n_main_streams < pls->ctx->nb_streams) {
1732  int ist_idx = pls->n_main_streams;
1733  AVStream *st = avformat_new_stream(s, NULL);
1734  AVStream *ist = pls->ctx->streams[ist_idx];
1735 
1736  if (!st)
1737  return AVERROR(ENOMEM);
1738 
1739  st->id = pls->index;
1740  dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
1741 
1742  add_stream_to_programs(s, pls, st);
1743 
1744  err = set_stream_info_from_input_stream(st, pls, ist);
1745  if (err < 0)
1746  return err;
1747  }
1748 
1749  return 0;
1750 }
1751 
1753 {
1754  HLSContext *c = s->priv_data;
1755  int flag_needed = 0;
1756  int i;
1757 
1758  for (i = 0; i < c->n_playlists; i++) {
1759  struct playlist *pls = c->playlists[i];
1760 
1761  if (pls->has_noheader_flag) {
1762  flag_needed = 1;
1763  break;
1764  }
1765  }
1766 
1767  if (flag_needed)
1769  else
1771 }
1772 
1774 {
1775  HLSContext *c = s->priv_data;
1776 
1777  free_playlist_list(c);
1778  free_variant_list(c);
1780 
1781  av_dict_free(&c->avio_opts);
1783 
1784  return 0;
1785 }
1786 
1788 {
1789  HLSContext *c = s->priv_data;
1790  int ret = 0, i;
1791  int highest_cur_seq_no = 0;
1792 
1793  c->ctx = s;
1795 
1796  c->first_packet = 1;
1799 
1800  if ((ret = save_avio_options(s)) < 0)
1801  goto fail;
1802 
1803  /* Some HLS servers don't like being sent the range header */
1804  av_dict_set(&c->avio_opts, "seekable", "0", 0);
1805 
1806  if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
1807  goto fail;
1808 
1809  if (c->n_variants == 0) {
1810  av_log(s, AV_LOG_WARNING, "Empty playlist\n");
1811  ret = AVERROR_EOF;
1812  goto fail;
1813  }
1814  /* If the playlist only contained playlists (Master Playlist),
1815  * parse each individual playlist. */
1816  if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1817  for (i = 0; i < c->n_playlists; i++) {
1818  struct playlist *pls = c->playlists[i];
1819  if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
1820  goto fail;
1821  }
1822  }
1823 
1824  if (c->variants[0]->playlists[0]->n_segments == 0) {
1825  av_log(s, AV_LOG_WARNING, "Empty segment\n");
1826  ret = AVERROR_EOF;
1827  goto fail;
1828  }
1829 
1830  /* If this isn't a live stream, calculate the total duration of the
1831  * stream. */
1832  if (c->variants[0]->playlists[0]->finished) {
1833  int64_t duration = 0;
1834  for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1835  duration += c->variants[0]->playlists[0]->segments[i]->duration;
1836  s->duration = duration;
1837  }
1838 
1839  /* Associate renditions with variants */
1840  for (i = 0; i < c->n_variants; i++) {
1841  struct variant *var = c->variants[i];
1842 
1843  if (var->audio_group[0])
1845  if (var->video_group[0])
1847  if (var->subtitles_group[0])
1849  }
1850 
1851  /* Create a program for each variant */
1852  for (i = 0; i < c->n_variants; i++) {
1853  struct variant *v = c->variants[i];
1854  AVProgram *program;
1855 
1856  program = av_new_program(s, i);
1857  if (!program)
1858  goto fail;
1859  av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1860  }
1861 
1862  /* Select the starting segments */
1863  for (i = 0; i < c->n_playlists; i++) {
1864  struct playlist *pls = c->playlists[i];
1865 
1866  if (pls->n_segments == 0)
1867  continue;
1868 
1869  pls->cur_seq_no = select_cur_seq_no(c, pls);
1870  highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
1871  }
1872 
1873  /* Open the demuxer for each playlist */
1874  for (i = 0; i < c->n_playlists; i++) {
1875  struct playlist *pls = c->playlists[i];
1876  ff_const59 AVInputFormat *in_fmt = NULL;
1877 
1878  if (!(pls->ctx = avformat_alloc_context())) {
1879  ret = AVERROR(ENOMEM);
1880  goto fail;
1881  }
1882 
1883  if (pls->n_segments == 0)
1884  continue;
1885 
1886  pls->index = i;
1887  pls->needed = 1;
1888  pls->parent = s;
1889 
1890  /*
1891  * If this is a live stream and this playlist looks like it is one segment
1892  * behind, try to sync it up so that every substream starts at the same
1893  * time position (so e.g. avformat_find_stream_info() will see packets from
1894  * all active streams within the first few seconds). This is not very generic,
1895  * though, as the sequence numbers are technically independent.
1896  */
1897  if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
1898  highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
1899  pls->cur_seq_no = highest_cur_seq_no;
1900  }
1901 
1903  if (!pls->read_buffer){
1904  ret = AVERROR(ENOMEM);
1905  avformat_free_context(pls->ctx);
1906  pls->ctx = NULL;
1907  goto fail;
1908  }
1909  ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1910  read_data, NULL, NULL);
1911  pls->pb.seekable = 0;
1912  ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1913  NULL, 0, 0);
1914  if (ret < 0) {
1915  /* Free the ctx - it isn't initialized properly at this point,
1916  * so avformat_close_input shouldn't be called. If
1917  * avformat_open_input fails below, it frees and zeros the
1918  * context, so it doesn't need any special treatment like this. */
1919  av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1920  avformat_free_context(pls->ctx);
1921  pls->ctx = NULL;
1922  goto fail;
1923  }
1924  pls->ctx->pb = &pls->pb;
1925  pls->ctx->io_open = nested_io_open;
1926  pls->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
1927 
1928  if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1929  goto fail;
1930 
1931  ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1932  if (ret < 0)
1933  goto fail;
1934 
1935  if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1940  pls->id3_deferred_extra = NULL;
1941  }
1942 
1943  if (pls->is_id3_timestamped == -1)
1944  av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1945 
1946  /*
1947  * For ID3 timestamped raw audio streams we need to detect the packet
1948  * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
1949  * but for other streams we can rely on our user calling avformat_find_stream_info()
1950  * on us if they want to.
1951  */
1952  if (pls->is_id3_timestamped || (pls->n_renditions > 0 && pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) {
1953  ret = avformat_find_stream_info(pls->ctx, NULL);
1954  if (ret < 0)
1955  goto fail;
1956  }
1957 
1958  pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
1959 
1960  /* Create new AVStreams for each stream in this playlist */
1961  ret = update_streams_from_subdemuxer(s, pls);
1962  if (ret < 0)
1963  goto fail;
1964 
1965  /*
1966  * Copy any metadata from playlist to main streams, but do not set
1967  * event flags.
1968  */
1969  if (pls->n_main_streams)
1970  av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);
1971 
1975  }
1976 
1978 
1979  return 0;
1980 fail:
1981  hls_close(s);
1982  return ret;
1983 }
1984 
1986 {
1987  HLSContext *c = s->priv_data;
1988  int i, changed = 0;
1989  int cur_needed;
1990 
1991  /* Check if any new streams are needed */
1992  for (i = 0; i < c->n_playlists; i++) {
1993  struct playlist *pls = c->playlists[i];
1994 
1995  cur_needed = playlist_needed(c->playlists[i]);
1996 
1997  if (cur_needed && !pls->needed) {
1998  pls->needed = 1;
1999  changed = 1;
2000  pls->cur_seq_no = select_cur_seq_no(c, pls);
2001  pls->pb.eof_reached = 0;
2002  if (c->cur_timestamp != AV_NOPTS_VALUE) {
2003  /* catch up */
2004  pls->seek_timestamp = c->cur_timestamp;
2005  pls->seek_flags = AVSEEK_FLAG_ANY;
2006  pls->seek_stream_index = -1;
2007  }
2008  av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
2009  } else if (first && !cur_needed && pls->needed) {
2010  if (pls->input)
2011  ff_format_io_close(pls->parent, &pls->input);
2012  pls->input_read_done = 0;
2013  if (pls->input_next)
2014  ff_format_io_close(pls->parent, &pls->input_next);
2015  pls->input_next_requested = 0;
2016  pls->needed = 0;
2017  changed = 1;
2018  av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
2019  }
2020  }
2021  return changed;
2022 }
2023 
2025 {
2026  if (pls->id3_offset >= 0) {
2027  pls->pkt.dts = pls->id3_mpegts_timestamp +
2028  av_rescale_q(pls->id3_offset,
2029  pls->ctx->streams[pls->pkt.stream_index]->time_base,
2031  if (pls->pkt.duration)
2032  pls->id3_offset += pls->pkt.duration;
2033  else
2034  pls->id3_offset = -1;
2035  } else {
2036  /* there have been packets with unknown duration
2037  * since the last id3 tag, should not normally happen */
2038  pls->pkt.dts = AV_NOPTS_VALUE;
2039  }
2040 
2041  if (pls->pkt.duration)
2042  pls->pkt.duration = av_rescale_q(pls->pkt.duration,
2043  pls->ctx->streams[pls->pkt.stream_index]->time_base,
2045 
2046  pls->pkt.pts = AV_NOPTS_VALUE;
2047 }
2048 
2049 static AVRational get_timebase(struct playlist *pls)
2050 {
2051  if (pls->is_id3_timestamped)
2052  return MPEG_TIME_BASE_Q;
2053 
2054  return pls->ctx->streams[pls->pkt.stream_index]->time_base;
2055 }
2056 
2057 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
2058  int64_t ts_b, struct playlist *pls_b)
2059 {
2060  int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
2061  int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
2062 
2063  return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
2064 }
2065 
2067 {
2068  HLSContext *c = s->priv_data;
2069  int ret, i, minplaylist = -1;
2070 
2072  c->first_packet = 0;
2073 
2074  for (i = 0; i < c->n_playlists; i++) {
2075  struct playlist *pls = c->playlists[i];
2076  /* Make sure we've got one buffered packet from each open playlist
2077  * stream */
2078  if (pls->needed && !pls->pkt.data) {
2079  while (1) {
2080  int64_t ts_diff;
2081  AVRational tb;
2082  ret = av_read_frame(pls->ctx, &pls->pkt);
2083  if (ret < 0) {
2084  if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
2085  return ret;
2086  reset_packet(&pls->pkt);
2087  break;
2088  } else {
2089  /* stream_index check prevents matching picture attachments etc. */
2090  if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
2091  /* audio elementary streams are id3 timestamped */
2093  }
2094 
2095  if (c->first_timestamp == AV_NOPTS_VALUE &&
2096  pls->pkt.dts != AV_NOPTS_VALUE)
2097  c->first_timestamp = av_rescale_q(pls->pkt.dts,
2099  }
2100 
2101  if (pls->seek_timestamp == AV_NOPTS_VALUE)
2102  break;
2103 
2104  if (pls->seek_stream_index < 0 ||
2105  pls->seek_stream_index == pls->pkt.stream_index) {
2106 
2107  if (pls->pkt.dts == AV_NOPTS_VALUE) {
2109  break;
2110  }
2111 
2112  tb = get_timebase(pls);
2113  ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
2114  tb.den, AV_ROUND_DOWN) -
2115  pls->seek_timestamp;
2116  if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
2117  pls->pkt.flags & AV_PKT_FLAG_KEY)) {
2119  break;
2120  }
2121  }
2122  av_packet_unref(&pls->pkt);
2123  reset_packet(&pls->pkt);
2124  }
2125  }
2126  /* Check if this stream has the packet with the lowest dts */
2127  if (pls->pkt.data) {
2128  struct playlist *minpls = minplaylist < 0 ?
2129  NULL : c->playlists[minplaylist];
2130  if (minplaylist < 0) {
2131  minplaylist = i;
2132  } else {
2133  int64_t dts = pls->pkt.dts;
2134  int64_t mindts = minpls->pkt.dts;
2135 
2136  if (dts == AV_NOPTS_VALUE ||
2137  (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
2138  minplaylist = i;
2139  }
2140  }
2141  }
2142 
2143  /* If we got a packet, return it */
2144  if (minplaylist >= 0) {
2145  struct playlist *pls = c->playlists[minplaylist];
2146  AVStream *ist;
2147  AVStream *st;
2148 
2149  ret = update_streams_from_subdemuxer(s, pls);
2150  if (ret < 0) {
2151  av_packet_unref(&pls->pkt);
2152  reset_packet(&pls->pkt);
2153  return ret;
2154  }
2155 
2156  // If sub-demuxer reports updated metadata, copy it to the first stream
2157  // and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
2159  if (pls->n_main_streams) {
2160  st = pls->main_streams[0];
2161  av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
2163  }
2165  }
2166 
2167  /* check if noheader flag has been cleared by the subdemuxer */
2168  if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
2169  pls->has_noheader_flag = 0;
2171  }
2172 
2173  if (pls->pkt.stream_index >= pls->n_main_streams) {
2174  av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
2175  pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
2176  av_packet_unref(&pls->pkt);
2177  reset_packet(&pls->pkt);
2178  return AVERROR_BUG;
2179  }
2180 
2181  ist = pls->ctx->streams[pls->pkt.stream_index];
2182  st = pls->main_streams[pls->pkt.stream_index];
2183 
2184  *pkt = pls->pkt;
2185  pkt->stream_index = st->index;
2186  reset_packet(&c->playlists[minplaylist]->pkt);
2187 
2188  if (pkt->dts != AV_NOPTS_VALUE)
2189  c->cur_timestamp = av_rescale_q(pkt->dts,
2190  ist->time_base,
2191  AV_TIME_BASE_Q);
2192 
2193  /* There may be more situations where this would be useful, but this at least
2194  * handles newly probed codecs properly (i.e. request_probe by mpegts). */
2195  if (ist->codecpar->codec_id != st->codecpar->codec_id) {
2196  ret = set_stream_info_from_input_stream(st, pls, ist);
2197  if (ret < 0) {
2198  av_packet_unref(pkt);
2199  return ret;
2200  }
2201  }
2202 
2203  return 0;
2204  }
2205  return AVERROR_EOF;
2206 }
2207 
2208 static int hls_read_seek(AVFormatContext *s, int stream_index,
2209  int64_t timestamp, int flags)
2210 {
2211  HLSContext *c = s->priv_data;
2212  struct playlist *seek_pls = NULL;
2213  int i, seq_no;
2214  int j;
2215  int stream_subdemuxer_index;
2216  int64_t first_timestamp, seek_timestamp, duration;
2217 
2218  if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
2219  return AVERROR(ENOSYS);
2220 
2221  first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
2222  0 : c->first_timestamp;
2223 
2224  seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
2225  s->streams[stream_index]->time_base.den,
2226  flags & AVSEEK_FLAG_BACKWARD ?
2228 
2229  duration = s->duration == AV_NOPTS_VALUE ?
2230  0 : s->duration;
2231 
2232  if (0 < duration && duration < seek_timestamp - first_timestamp)
2233  return AVERROR(EIO);
2234 
2235  /* find the playlist with the specified stream */
2236  for (i = 0; i < c->n_playlists; i++) {
2237  struct playlist *pls = c->playlists[i];
2238  for (j = 0; j < pls->n_main_streams; j++) {
2239  if (pls->main_streams[j] == s->streams[stream_index]) {
2240  seek_pls = pls;
2241  stream_subdemuxer_index = j;
2242  break;
2243  }
2244  }
2245  }
2246  /* check if the timestamp is valid for the playlist with the
2247  * specified stream index */
2248  if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
2249  return AVERROR(EIO);
2250 
2251  /* set segment now so we do not need to search again below */
2252  seek_pls->cur_seq_no = seq_no;
2253  seek_pls->seek_stream_index = stream_subdemuxer_index;
2254 
2255  for (i = 0; i < c->n_playlists; i++) {
2256  /* Reset reading */
2257  struct playlist *pls = c->playlists[i];
2258  if (pls->input)
2259  ff_format_io_close(pls->parent, &pls->input);
2260  pls->input_read_done = 0;
2261  if (pls->input_next)
2262  ff_format_io_close(pls->parent, &pls->input_next);
2263  pls->input_next_requested = 0;
2264  av_packet_unref(&pls->pkt);
2265  reset_packet(&pls->pkt);
2266  pls->pb.eof_reached = 0;
2267  /* Clear any buffered data */
2268  pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
2269  /* Reset the pos, to let the mpegts demuxer know we've seeked. */
2270  pls->pb.pos = 0;
2271  /* Flush the packet queue of the subdemuxer. */
2272  ff_read_frame_flush(pls->ctx);
2273 
2275  pls->seek_flags = flags;
2276 
2277  if (pls != seek_pls) {
2278  /* set closest segment seq_no for playlists not handled above */
2279  find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
2280  /* seek the playlist to the given position without taking
2281  * keyframes into account since this playlist does not have the
2282  * specified stream where we should look for the keyframes */
2283  pls->seek_stream_index = -1;
2284  pls->seek_flags |= AVSEEK_FLAG_ANY;
2285  }
2286  }
2287 
2289 
2290  return 0;
2291 }
2292 
2293 static int hls_probe(const AVProbeData *p)
2294 {
2295  /* Require #EXTM3U at the start, and either one of the ones below
2296  * somewhere for a proper match. */
2297  if (strncmp(p->buf, "#EXTM3U", 7))
2298  return 0;
2299 
2300  if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
2301  strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
2302  strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
2303  return AVPROBE_SCORE_MAX;
2304  return 0;
2305 }
2306 
2307 #define OFFSET(x) offsetof(HLSContext, x)
2308 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2309 static const AVOption hls_options[] = {
2310  {"live_start_index", "segment index to start live streams at (negative values are from the end)",
2311  OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
2312  {"allowed_extensions", "List of file extensions that hls is allowed to access",
2313  OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2314  {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
2315  INT_MIN, INT_MAX, FLAGS},
2316  {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
2317  OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2318  {"http_persistent", "Use persistent HTTP connections",
2319  OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
2320  {"http_multiple", "Use multiple HTTP connections for fetching segments",
2321  OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
2322  {NULL}
2323 };
2324 
2325 static const AVClass hls_class = {
2326  .class_name = "hls demuxer",
2327  .item_name = av_default_item_name,
2328  .option = hls_options,
2329  .version = LIBAVUTIL_VERSION_INT,
2330 };
2331 
2333  .name = "hls",
2334  .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
2335  .priv_class = &hls_class,
2336  .priv_data_size = sizeof(HLSContext),
2338  .read_probe = hls_probe,
2341  .read_close = hls_close,
2343 };
#define FF_COMPLIANCE_EXPERIMENTAL
Allow nonstandardized experimental things.
Definition: avcodec.h:2629
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2511
int(* io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
A callback for opening new IO streams.
Definition: avformat.h:1940
uint8_t key[16]
Definition: hls.c:131
#define NULL
Definition: coverity.c:32
static int update_init_section(struct playlist *pls, struct segment *seg)
Definition: hls.c:1271
int needed
Definition: hls.c:118
struct segment * init_section
Definition: hls.c:77
void ff_make_absolute_url(char *buf, int size, const char *base, const char *rel)
Convert a relative url into an absolute url, given a base url.
Definition: url.c:80
void * data
Definition: id3v2.h:59
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:336
int bandwidth
Definition: hls.c:178
static int read_from_url(struct playlist *pls, struct segment *seg, uint8_t *buf, int buf_size)
Definition: hls.c:970
#define AVSTREAM_EVENT_FLAG_METADATA_UPDATED
The call resulted in updated metadata.
Definition: avformat.h:995
Definition: hls.c:93
char assoc_language[MAX_FIELD_LEN]
Definition: hls.c:452
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1636
AVDictionary * id3_initial
Definition: hls.c:140
AVOption.
Definition: opt.h:246
static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
Definition: hls.c:1708
struct segment ** init_sections
Definition: hls.c:159
static void handle_init_section_args(struct init_section_info *info, const char *key, int key_len, char **dest, int *dest_len)
Definition: hls.c:435
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
unsigned int id3_buf_size
Definition: hls.c:139
ID3v2ExtraMeta * id3_deferred_extra
Definition: hls.c:143
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:228
unsigned char * buf_end
End of the data, may be less than buffer+buffer_size if the read function returned less data than req...
Definition: avio.h:229
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4882
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:164
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2513
int event_flags
Flags for the user to detect events happening on the stream.
Definition: avformat.h:994
char forced[4]
Definition: hls.c:455
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
static struct rendition * new_rendition(HLSContext *c, struct rendition_info *info, const char *url_base)
Definition: hls.c:459
static int64_t default_reload_interval(struct playlist *pls)
Definition: hls.c:1328
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
int disposition
Definition: hls.c:174
unsigned int init_sec_data_len
Definition: hls.c:127
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:882
int size
Definition: avcodec.h:1478
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
#define AVIO_FLAG_READ
read-only
Definition: avio.h:654
char language[MAX_FIELD_LEN]
Definition: hls.c:451
unsigned char * buffer
Start of the buffer.
Definition: avio.h:226
int has_noheader_flag
Definition: hls.c:105
int event_flags
Flags for the user to detect events happening on the file.
Definition: avformat.h:1673
int av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags)
Copy entries from one AVDictionary struct into another.
Definition: dict.c:217
GLint GLenum type
Definition: opengl_enc.c:104
#define AV_DISPOSITION_HEARING_IMPAIRED
stream for hearing impaired audiences
Definition: avformat.h:839
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:537
static void fill_buf(uint8_t *data, int w, int h, int linesize, uint8_t v)
char * key
Definition: hls.c:73
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:84
discard all
Definition: avcodec.h:811
static AVPacket pkt
static void handle_rendition_args(struct rendition_info *info, const char *key, int key_len, char **dest, int *dest_len)
Definition: hls.c:543
#define MAX_CHARACTERISTICS_LEN
Definition: hls.c:45
int av_probe_input_buffer(AVIOContext *pb, ff_const59 AVInputFormat **fmt, const char *url, void *logctx, unsigned int offset, unsigned int max_probe_size)
Like av_probe_input_buffer2() but returns 0 on success.
Definition: format.c:312
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1407
int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Create a stream for each APIC (attached picture) extracted from the ID3v2 header. ...
Definition: id3v2.c:1143
static void reset_packet(AVPacket *pkt)
Definition: hls.c:297
int strict_std_compliance
Allow non-standard and experimental extension.
Definition: avformat.h:1666
char * url
Definition: hls.c:72
uint8_t base
Definition: vp3data.h:202
int64_t url_offset
Definition: hls.c:70
static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata, ID3v2ExtraMetaAPIC *apic)
Definition: hls.c:1013
Format I/O context.
Definition: avformat.h:1358
#define MAX_URL_SIZE
Definition: internal.h:30
unsigned int nb_stream_indexes
Definition: avformat.h:1280
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
char method[11]
Definition: hls.c:374
void ff_read_frame_flush(AVFormatContext *s)
Flush the frame reader.
Definition: utils.c:1918
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
unsigned int init_sec_buf_read_offset
Definition: hls.c:128
Public dictionary API.
char type[16]
Definition: hls.c:448
int n_renditions
Definition: hls.c:196
#define ID3v2_HEADER_SIZE
Definition: id3v2.h:30
#define MPEG_TIME_BASE_Q
Definition: hls.c:48
enum AVMediaType type
Definition: hls.c:169
uint8_t iv[16]
Definition: hls.c:75
char defaultr[4]
Definition: hls.c:454
uint8_t
Round toward +infinity.
Definition: mathematics.h:83
int http_multiple
Definition: hls.c:209
int n_variants
Definition: hls.c:192
#define FLAGS
Definition: hls.c:2308
#define av_malloc(s)
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1302
AVOptions.
char group_id[MAX_FIELD_LEN]
Definition: hls.c:450
int64_t cur_seg_offset
Definition: hls.c:120
char audio[MAX_FIELD_LEN]
Definition: hls.c:323
static void free_rendition_list(HLSContext *c)
Definition: hls.c:284
#define AVFMTCTX_UNSEEKABLE
signal that the stream is definitely not seekable, and attempts to call the seek function will fail...
Definition: avformat.h:1305
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1495
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
static struct segment * next_segment(struct playlist *pls)
Definition: hls.c:962
int id
Format-specific stream ID.
Definition: avformat.h:888
uint8_t * read_buffer
Definition: hls.c:96
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:5637
char url[MAX_URL_SIZE]
Definition: hls.c:94
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But first
static void intercept_id3(struct playlist *pls, uint8_t *buf, int buf_size, int *len)
Definition: hls.c:1084
static struct playlist * new_playlist(HLSContext *c, const char *url, const char *base)
Definition: hls.c:303
AVInputFormat ff_hls_demuxer
Definition: hls.c:2332
int ff_id3v2_parse_priv_dict(AVDictionary **metadata, ID3v2ExtraMeta **extra_meta)
Parse PRIV tags into a dictionary.
Definition: id3v2.c:1234
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4455
int finished
Definition: hls.c:112
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
static void handle_id3(AVIOContext *pb, struct playlist *pls)
Definition: hls.c:1042
int n_playlists
Definition: hls.c:194
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:144
#define AVERROR_PROTOCOL_NOT_FOUND
Protocol not found.
Definition: error.h: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:1489
uint8_t * data
Definition: avcodec.h:1477
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:4554
static int read_data(void *opaque, uint8_t *buf, int buf_size)
Definition: hls.c:1381
#define AVERROR_EOF
End of file.
Definition: error.h:55
unsigned int init_sec_buf_size
Definition: hls.c:126
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
int input_next_requested
Definition: hls.c:100
int av_match_ext(const char *filename, const char *extensions)
Return a positive value if the given filename has one of the given extensions, 0 otherwise.
Definition: format.c:38
ptrdiff_t size
Definition: opengl_enc.c:100
struct rendition ** renditions
Definition: hls.c:154
static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb, const char *url)
Definition: hls.c:597
enum AVDiscard discard
selects which program to discard and which to feed to the caller
Definition: avformat.h:1278
static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls, enum AVMediaType type)
Definition: hls.c:1553
unsigned int * stream_index
Definition: avformat.h:1279
#define av_log(a,...)
static void free_playlist_list(HLSContext *c)
Definition: hls.c:241
struct rendition ** renditions
Definition: hls.c:197
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1509
struct variant ** variants
Definition: hls.c:193
static void free_segment_dynarray(struct segment **segments, int n_segments)
Definition: hls.c:213
static AVRational get_timebase(struct playlist *pls)
Definition: hls.c:2049
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
Callback for checking whether to abort blocking functions.
Definition: avio.h:58
#define ff_const59
The ff_const59 define is not part of the public API and will be removed without further warning...
Definition: avformat.h:549
AVIOContext * playlist_pb
Definition: hls.c:210
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2013
AVStream ** main_streams
Definition: hls.c:109
static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a, int64_t ts_b, struct playlist *pls_b)
Definition: hls.c:2057
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AV_DICT_MATCH_CASE
Only get an entry with exact-case key match.
Definition: dict.h:69
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
char video_group[MAX_FIELD_LEN]
Definition: hls.c:185
int64_t cur_timestamp
Definition: hls.c:203
int n_renditions
Definition: hls.c:153
static const AVClass hls_class
Definition: hls.c:2325
AVIOInterruptCB * interrupt_callback
Definition: hls.c:204
char bandwidth[20]
Definition: hls.c:321
static void handle_key_args(struct key_info *info, const char *key, int key_len, char **dest, int *dest_len)
Definition: hls.c:378
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
char * url
input or output URL.
Definition: avformat.h:1454
const char * r
Definition: vf_curves.c:114
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
unsigned int nb_programs
Definition: avformat.h:1537
char byterange[32]
Definition: hls.c:395
int64_t id3_mpegts_timestamp
Definition: hls.c:136
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:203
static void free_segment_list(struct playlist *pls)
Definition: hls.c:223
int ff_id3v2_parse_priv(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Add metadata for all PRIV tags in the ID3v2 header.
Definition: id3v2.c:1276
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1127
Definition: graph2dot.c:48
simple assert() macros that are a bit more flexible than ISO C assert().
static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
Definition: hls.c:1727
int first_packet
Definition: hls.c:201
static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls, int64_t timestamp, int *seq_no)
Definition: hls.c:1585
uint8_t * data
Definition: id3v2.h:80
int64_t id3_offset
Definition: hls.c:137
int is_id3_timestamped
Definition: hls.c:135
New fields can be added to the end with minor version bumps.
Definition: avformat.h:1275
#define FFMAX(a, b)
Definition: common.h:94
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:120
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1483
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:500
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
int live_start_index
Definition: hls.c:200
Definition: hls.c:68
#define AV_DISPOSITION_FORCED
Track should be used during playback by default.
Definition: avformat.h:838
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
AVDictionary * opts
Definition: movenc.c:50
char group_id[MAX_FIELD_LEN]
Definition: hls.c:171
static struct segment * current_segment(struct playlist *pls)
Definition: hls.c:957
MIPS optimizations info
Definition: mips.txt:2
int n_main_streams
Definition: hls.c:110
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
#define dynarray_add(tab, nb_ptr, elem)
Definition: internal.h:198
static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **opts)
Definition: hls.c:1672
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx)
#define FFMIN(a, b)
Definition: common.h:96
void(* ff_parse_key_val_cb)(void *context, const char *key, int key_len, char **dest, int *dest_len)
Callback function type for ff_parse_key_value.
Definition: internal.h:366
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:556
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
char * allowed_extensions
Definition: hls.c:206
int index
Definition: hls.c:102
AVIOContext * input_next
Definition: hls.c:99
static void add_renditions_to_variant(HLSContext *c, struct variant *var, enum AVMediaType type, const char *group_id)
Definition: hls.c:1529
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C program
Definition: undefined.txt:3
uint8_t * init_sec_buf
Definition: hls.c:125
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: hls.c:2066
uint8_t * id3_buf
Definition: hls.c:138
#define AVFMT_EVENT_FLAG_METADATA_UPDATED
The call resulted in updated metadata.
Definition: avformat.h:1674
Definition: hls.c:372
#define s(width, name)
Definition: cbs_vp9.c:257
static struct segment * new_init_section(struct playlist *pls, struct init_section_info *info, const char *url_base)
Definition: hls.c:398
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
Definition: mem.c:476
int n
Definition: avisynth_c.h:760
AVDictionary * metadata
Definition: avformat.h:945
static struct variant * new_variant(HLSContext *c, struct variant_info *info, const char *url, const char *base)
Definition: hls.c:328
#define AVFMT_FLAG_CUSTOM_IO
The caller has supplied a custom AVIOContext, don&#39;t avio_close() it.
Definition: avformat.h:1497
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
Definition: hls.c:2024
struct segment ** segments
Definition: hls.c:117
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
Definition: error.h:56
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:58
AVPacket pkt
Definition: hls.c:104
uint8_t * owner
Definition: id3v2.h:79
int input_read_done
Definition: hls.c:98
char subtitles_group[MAX_FIELD_LEN]
Definition: hls.c:186
char name[MAX_FIELD_LEN]
Definition: hls.c:453
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
#define AV_DISPOSITION_VISUAL_IMPAIRED
stream for visual impaired audiences
Definition: avformat.h:840
int64_t size
Definition: hls.c:71
enum KeyType key_type
Definition: hls.c:74
Stream structure.
Definition: avformat.h:881
int id3_changed
Definition: hls.c:142
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int avformat_queue_attached_pictures(AVFormatContext *s)
Definition: utils.c:479
AVFormatContext * parent
Definition: hls.c:101
AVFormatContext * ctx
Definition: hls.c:191
static void parse_id3(AVFormatContext *s, AVIOContext *pb, AVDictionary **metadata, int64_t *dts, ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
Definition: hls.c:987
#define AV_DISPOSITION_DEFAULT
Definition: avformat.h:826
int64_t first_timestamp
Definition: hls.c:202
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
char subtitles[MAX_FIELD_LEN]
Definition: hls.c:325
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1238
struct ID3v2ExtraMeta * next
Definition: id3v2.h:60
int ff_check_interrupt(AVIOInterruptCB *cb)
Check if the user has requested to interrupt a blocking function associated with cb.
Definition: avio.c:664
enum PlaylistType type
Definition: hls.c:113
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
static int parse_playlist(HLSContext *c, const char *url, struct playlist *pls, AVIOContext *in)
Definition: hls.c:692
int n_init_sections
Definition: hls.c:158
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
uint8_t * data
The data buffer.
Definition: buffer.h:89
static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url, AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
Definition: hls.c:615
#define AVFMT_NOGENSEARCH
Format does not allow to fall back on generic search.
Definition: avformat.h:474
static const AVOption hls_options[]
Definition: hls.c:2309
static int hls_read_header(AVFormatContext *s)
Definition: hls.c:1787
void * buf
Definition: avisynth_c.h:766
Definition: url.h:38
int max_reload
Definition: hls.c:207
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
struct playlist ** playlists
Definition: hls.c:195
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
Definition: hls.c:1184
Undefined Behavior In the C language
Definition: undefined.txt:3
int64_t last_load_time
Definition: hls.c:121
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Definition: log.h:67
static void update_noheader_flag(AVFormatContext *s)
Definition: hls.c:1752
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
AVIOContext * input
Definition: hls.c:97
Rational number (pair of numerator and denominator).
Definition: rational.h:58
struct segment * cur_init_section
Definition: hls.c:124
int seek_stream_index
Definition: hls.c:147
PlaylistType
Definition: hls.c:82
int64_t target_duration
Definition: hls.c:114
static int save_avio_options(AVFormatContext *s)
Definition: hls.c:1650
#define AV_OPT_ALLOW_NULL
In av_opt_get, return NULL if the option has a pointer type and is set to NULL, rather than returning...
Definition: opt.h:571
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2512
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar) ...
Definition: internal.h:192
char uri[MAX_URL_SIZE]
Definition: hls.c:449
AVMediaType
Definition: avutil.h:199
int n_playlists
Definition: hls.c:181
struct playlist * playlist
Definition: hls.c:170
static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
Definition: hls.c:1682
#define MPEG_TIME_BASE
Definition: hls.c:47
#define snprintf
Definition: snprintf.h:34
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:4389
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
int ff_hex_to_data(uint8_t *data, const char *p)
Parse a string of hexadecimal strings.
Definition: utils.c:4854
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1768
Definition: hls.c:168
Round toward -infinity.
Definition: mathematics.h:82
static void handle_variant_args(struct variant_info *info, const char *key, int key_len, char **dest, int *dest_len)
Definition: hls.c:354
const char * avio_find_protocol_name(const char *url)
Return the name of the protocol that will handle the passed URL.
Definition: avio.c:473
int size
Size of data in bytes.
Definition: buffer.h:93
URLContext * ffio_geturlcontext(AVIOContext *s)
Return the URLContext associated with the AVIOContext.
Definition: aviobuf.c:1039
AVDictionary * metadata
Definition: avformat.h:1281
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
char audio_group[MAX_FIELD_LEN]
Definition: hls.c:184
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
#define flags(name, subs,...)
Definition: cbs_av1.c:561
KeyType
Definition: hls.c:62
static int recheck_discard_flags(AVFormatContext *s, int first)
Definition: hls.c:1985
void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf, void *context)
Parse a string with comma-separated key=value pairs.
Definition: utils.c:4912
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int ff_http_do_new_request(URLContext *h, const char *uri)
Send a new HTTP request, reusing the old connection.
Definition: http.c:308
int64_t seek_timestamp
Definition: hls.c:145
char iv[35]
Definition: hls.c:375
#define OFFSET(x)
Definition: hls.c:2307
char characteristics[MAX_CHARACTERISTICS_LEN]
Definition: hls.c:456
int seek_flags
Definition: hls.c:146
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok()...
Definition: avstring.c:184
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
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
char language[MAX_FIELD_LEN]
Definition: hls.c:172
AVIOContext pb
Definition: hls.c:95
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:87
Main libavformat public API header.
char uri[MAX_URL_SIZE]
Definition: hls.c:373
#define INITIAL_BUFFER_SIZE
Definition: hls.c:42
int ff_id3v2_match(const uint8_t *buf, const char *magic)
Detect ID3v2 Header.
Definition: id3v2.c:143
int ffio_init_context(AVIOContext *s, unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Definition: aviobuf.c:81
#define MAX_FIELD_LEN
Definition: hls.c:44
static int playlist_needed(struct playlist *pls)
Definition: hls.c:1335
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3564
const char * tag
Definition: id3v2.h:58
int cur_seq_no
Definition: hls.c:199
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it...
Definition: dict.c:147
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:934
int64_t pos
position in the file of the current buffer
Definition: avio.h:238
int pts_wrap_bits
number of bits in pts (used for wrapping control)
Definition: avformat.h:1073
AVDictionary * avio_opts
Definition: hls.c:205
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
char * key
Definition: dict.h:86
int n_segments
Definition: hls.c:116
int den
Denominator.
Definition: rational.h:60
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4427
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:790
int http_persistent
Definition: hls.c:208
static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
Definition: hls.c:587
static int hls_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: hls.c:2208
A Quick Description Of Rate Distortion Theory We want to encode a video
static av_always_inline int diff(const uint32_t a, const uint32_t b)
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:761
#define av_free(p)
int id3_found
Definition: hls.c:141
char name[MAX_FIELD_LEN]
Definition: hls.c:173
void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta)
Read an ID3v2 tag into specified dictionary and retrieve supported extra metadata.
Definition: id3v2.c:1115
char * value
Definition: dict.h:87
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
int len
int ff_id3v2_tag_len(const uint8_t *buf)
Get the length of an ID3v2 tag.
Definition: id3v2.c:156
void * priv_data
Format private data.
Definition: avformat.h:1386
static int hls_probe(const AVProbeData *p)
Definition: hls.c:2293
AVBufferRef * buf
Definition: id3v2.h:72
AVFormatContext * ctx
Definition: hls.c:103
uint32_t datasize
Definition: id3v2.h:81
struct playlist ** playlists
Definition: hls.c:182
Definition: hls.c:177
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1476
char video[MAX_FIELD_LEN]
Definition: hls.c:324
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1473
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key, ignoring the suffix of the found key string.
Definition: dict.h:70
char uri[MAX_URL_SIZE]
Definition: hls.c:394
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
#define FFSWAP(type, a, b)
Definition: common.h:99
int start_seq_no
Definition: hls.c:115
int stream_index
Definition: avcodec.h:1479
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:910
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 void free_init_section_list(struct playlist *pls)
Definition: hls.c:230
int64_t duration
Definition: hls.c:69
static void free_variant_list(HLSContext *c)
Definition: hls.c:272
int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
Same as ff_get_line but strip the white-space characters in the text tail.
Definition: aviobuf.c:826
int cur_seq_no
Definition: hls.c:119
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:936
char key_url[MAX_URL_SIZE]
Definition: hls.c:130
static int hls_close(AVFormatContext *s)
Definition: hls.c:1773
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4833
This structure stores compressed data.
Definition: avcodec.h:1454
Definition: hls.c:63
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
AVPacket attached_pic
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached pictu...
Definition: avformat.h:963
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define tb
Definition: regdef.h:68
AVProgram ** programs
Definition: avformat.h:1538
static av_cold void cleanup(FlashSV2Context *s)
Definition: flashsv2enc.c:127
int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod)
Compare the remainders of two integer operands divided by a common divisor.
Definition: mathematics.c:160
const char * name
Definition: opengl_enc.c:102
static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
Definition: hls.c:1611
static uint8_t tmp[11]
Definition: aes_ctr.c:26