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;
212 } HLSContext;
213 
214 static void free_segment_dynarray(struct segment **segments, int n_segments)
215 {
216  int i;
217  for (i = 0; i < n_segments; i++) {
218  av_freep(&segments[i]->key);
219  av_freep(&segments[i]->url);
220  av_freep(&segments[i]);
221  }
222 }
223 
224 static void free_segment_list(struct playlist *pls)
225 {
227  av_freep(&pls->segments);
228  pls->n_segments = 0;
229 }
230 
231 static void free_init_section_list(struct playlist *pls)
232 {
233  int i;
234  for (i = 0; i < pls->n_init_sections; i++) {
235  av_freep(&pls->init_sections[i]->url);
236  av_freep(&pls->init_sections[i]);
237  }
238  av_freep(&pls->init_sections);
239  pls->n_init_sections = 0;
240 }
241 
243 {
244  int i;
245  for (i = 0; i < c->n_playlists; i++) {
246  struct playlist *pls = c->playlists[i];
247  free_segment_list(pls);
249  av_freep(&pls->main_streams);
250  av_freep(&pls->renditions);
251  av_freep(&pls->id3_buf);
252  av_dict_free(&pls->id3_initial);
254  av_freep(&pls->init_sec_buf);
255  av_packet_unref(&pls->pkt);
256  av_freep(&pls->pb.buffer);
257  if (pls->input)
258  ff_format_io_close(c->ctx, &pls->input);
259  pls->input_read_done = 0;
260  if (pls->input_next)
261  ff_format_io_close(c->ctx, &pls->input_next);
262  pls->input_next_requested = 0;
263  if (pls->ctx) {
264  pls->ctx->pb = NULL;
265  avformat_close_input(&pls->ctx);
266  }
267  av_free(pls);
268  }
269  av_freep(&c->playlists);
270  c->n_playlists = 0;
271 }
272 
274 {
275  int i;
276  for (i = 0; i < c->n_variants; i++) {
277  struct variant *var = c->variants[i];
278  av_freep(&var->playlists);
279  av_free(var);
280  }
281  av_freep(&c->variants);
282  c->n_variants = 0;
283 }
284 
286 {
287  int i;
288  for (i = 0; i < c->n_renditions; i++)
289  av_freep(&c->renditions[i]);
290  av_freep(&c->renditions);
291  c->n_renditions = 0;
292 }
293 
294 /*
295  * Used to reset a statically allocated AVPacket to a clean state,
296  * containing no data.
297  */
298 static void reset_packet(AVPacket *pkt)
299 {
300  av_init_packet(pkt);
301  pkt->data = NULL;
302 }
303 
304 static struct playlist *new_playlist(HLSContext *c, const char *url,
305  const char *base)
306 {
307  struct playlist *pls = av_mallocz(sizeof(struct playlist));
308  if (!pls)
309  return NULL;
310  reset_packet(&pls->pkt);
311  ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
313 
314  pls->is_id3_timestamped = -1;
316 
317  dynarray_add(&c->playlists, &c->n_playlists, pls);
318  return pls;
319 }
320 
321 struct variant_info {
322  char bandwidth[20];
323  /* variant group ids: */
324  char audio[MAX_FIELD_LEN];
326  char subtitles[MAX_FIELD_LEN];
327 };
328 
329 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
330  const char *url, const char *base)
331 {
332  struct variant *var;
333  struct playlist *pls;
334 
335  pls = new_playlist(c, url, base);
336  if (!pls)
337  return NULL;
338 
339  var = av_mallocz(sizeof(struct variant));
340  if (!var)
341  return NULL;
342 
343  if (info) {
344  var->bandwidth = atoi(info->bandwidth);
345  strcpy(var->audio_group, info->audio);
346  strcpy(var->video_group, info->video);
347  strcpy(var->subtitles_group, info->subtitles);
348  }
349 
350  dynarray_add(&c->variants, &c->n_variants, var);
351  dynarray_add(&var->playlists, &var->n_playlists, pls);
352  return var;
353 }
354 
355 static void handle_variant_args(struct variant_info *info, const char *key,
356  int key_len, char **dest, int *dest_len)
357 {
358  if (!strncmp(key, "BANDWIDTH=", key_len)) {
359  *dest = info->bandwidth;
360  *dest_len = sizeof(info->bandwidth);
361  } else if (!strncmp(key, "AUDIO=", key_len)) {
362  *dest = info->audio;
363  *dest_len = sizeof(info->audio);
364  } else if (!strncmp(key, "VIDEO=", key_len)) {
365  *dest = info->video;
366  *dest_len = sizeof(info->video);
367  } else if (!strncmp(key, "SUBTITLES=", key_len)) {
368  *dest = info->subtitles;
369  *dest_len = sizeof(info->subtitles);
370  }
371 }
372 
373 struct key_info {
374  char uri[MAX_URL_SIZE];
375  char method[11];
376  char iv[35];
377 };
378 
379 static void handle_key_args(struct key_info *info, const char *key,
380  int key_len, char **dest, int *dest_len)
381 {
382  if (!strncmp(key, "METHOD=", key_len)) {
383  *dest = info->method;
384  *dest_len = sizeof(info->method);
385  } else if (!strncmp(key, "URI=", key_len)) {
386  *dest = info->uri;
387  *dest_len = sizeof(info->uri);
388  } else if (!strncmp(key, "IV=", key_len)) {
389  *dest = info->iv;
390  *dest_len = sizeof(info->iv);
391  }
392 }
393 
395  char uri[MAX_URL_SIZE];
396  char byterange[32];
397 };
398 
399 static struct segment *new_init_section(struct playlist *pls,
400  struct init_section_info *info,
401  const char *url_base)
402 {
403  struct segment *sec;
404  char *ptr;
405  char tmp_str[MAX_URL_SIZE];
406 
407  if (!info->uri[0])
408  return NULL;
409 
410  sec = av_mallocz(sizeof(*sec));
411  if (!sec)
412  return NULL;
413 
414  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
415  sec->url = av_strdup(tmp_str);
416  if (!sec->url) {
417  av_free(sec);
418  return NULL;
419  }
420 
421  if (info->byterange[0]) {
422  sec->size = strtoll(info->byterange, NULL, 10);
423  ptr = strchr(info->byterange, '@');
424  if (ptr)
425  sec->url_offset = strtoll(ptr+1, NULL, 10);
426  } else {
427  /* the entire file is the init section */
428  sec->size = -1;
429  }
430 
431  dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
432 
433  return sec;
434 }
435 
436 static void handle_init_section_args(struct init_section_info *info, const char *key,
437  int key_len, char **dest, int *dest_len)
438 {
439  if (!strncmp(key, "URI=", key_len)) {
440  *dest = info->uri;
441  *dest_len = sizeof(info->uri);
442  } else if (!strncmp(key, "BYTERANGE=", key_len)) {
443  *dest = info->byterange;
444  *dest_len = sizeof(info->byterange);
445  }
446 }
447 
449  char type[16];
450  char uri[MAX_URL_SIZE];
451  char group_id[MAX_FIELD_LEN];
453  char assoc_language[MAX_FIELD_LEN];
455  char defaultr[4];
456  char forced[4];
457  char characteristics[MAX_CHARACTERISTICS_LEN];
458 };
459 
461  const char *url_base)
462 {
463  struct rendition *rend;
465  char *characteristic;
466  char *chr_ptr;
467  char *saveptr;
468 
469  if (!strcmp(info->type, "AUDIO"))
470  type = AVMEDIA_TYPE_AUDIO;
471  else if (!strcmp(info->type, "VIDEO"))
472  type = AVMEDIA_TYPE_VIDEO;
473  else if (!strcmp(info->type, "SUBTITLES"))
474  type = AVMEDIA_TYPE_SUBTITLE;
475  else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
476  /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
477  * AVC SEI RBSP anyway */
478  return NULL;
479 
480  if (type == AVMEDIA_TYPE_UNKNOWN) {
481  av_log(c, AV_LOG_WARNING, "Can't support the type: %s\n", info->type);
482  return NULL;
483  }
484 
485  /* URI is mandatory for subtitles as per spec */
486  if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) {
487  av_log(c, AV_LOG_ERROR, "The URI tag is REQUIRED for subtitle.\n");
488  return NULL;
489  }
490 
491  /* TODO: handle subtitles (each segment has to parsed separately) */
493  if (type == AVMEDIA_TYPE_SUBTITLE) {
494  av_log(c, AV_LOG_WARNING, "Can't support the subtitle(uri: %s)\n", info->uri);
495  return NULL;
496  }
497 
498  rend = av_mallocz(sizeof(struct rendition));
499  if (!rend)
500  return NULL;
501 
502  dynarray_add(&c->renditions, &c->n_renditions, rend);
503 
504  rend->type = type;
505  strcpy(rend->group_id, info->group_id);
506  strcpy(rend->language, info->language);
507  strcpy(rend->name, info->name);
508 
509  /* add the playlist if this is an external rendition */
510  if (info->uri[0]) {
511  rend->playlist = new_playlist(c, info->uri, url_base);
512  if (rend->playlist)
514  &rend->playlist->n_renditions, rend);
515  }
516 
517  if (info->assoc_language[0]) {
518  int langlen = strlen(rend->language);
519  if (langlen < sizeof(rend->language) - 3) {
520  rend->language[langlen] = ',';
521  strncpy(rend->language + langlen + 1, info->assoc_language,
522  sizeof(rend->language) - langlen - 2);
523  }
524  }
525 
526  if (!strcmp(info->defaultr, "YES"))
528  if (!strcmp(info->forced, "YES"))
530 
531  chr_ptr = info->characteristics;
532  while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
533  if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
535  else if (!strcmp(characteristic, "public.accessibility.describes-video"))
537 
538  chr_ptr = NULL;
539  }
540 
541  return rend;
542 }
543 
544 static void handle_rendition_args(struct rendition_info *info, const char *key,
545  int key_len, char **dest, int *dest_len)
546 {
547  if (!strncmp(key, "TYPE=", key_len)) {
548  *dest = info->type;
549  *dest_len = sizeof(info->type);
550  } else if (!strncmp(key, "URI=", key_len)) {
551  *dest = info->uri;
552  *dest_len = sizeof(info->uri);
553  } else if (!strncmp(key, "GROUP-ID=", key_len)) {
554  *dest = info->group_id;
555  *dest_len = sizeof(info->group_id);
556  } else if (!strncmp(key, "LANGUAGE=", key_len)) {
557  *dest = info->language;
558  *dest_len = sizeof(info->language);
559  } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
560  *dest = info->assoc_language;
561  *dest_len = sizeof(info->assoc_language);
562  } else if (!strncmp(key, "NAME=", key_len)) {
563  *dest = info->name;
564  *dest_len = sizeof(info->name);
565  } else if (!strncmp(key, "DEFAULT=", key_len)) {
566  *dest = info->defaultr;
567  *dest_len = sizeof(info->defaultr);
568  } else if (!strncmp(key, "FORCED=", key_len)) {
569  *dest = info->forced;
570  *dest_len = sizeof(info->forced);
571  } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
572  *dest = info->characteristics;
573  *dest_len = sizeof(info->characteristics);
574  }
575  /*
576  * ignored:
577  * - AUTOSELECT: client may autoselect based on e.g. system language
578  * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
579  */
580 }
581 
582 /* used by parse_playlist to allocate a new variant+playlist when the
583  * playlist is detected to be a Media Playlist (not Master Playlist)
584  * and we have no parent Master Playlist (parsing of which would have
585  * allocated the variant and playlist already)
586  * *pls == NULL => Master Playlist or parentless Media Playlist
587  * *pls != NULL => parented Media Playlist, playlist+variant allocated */
588 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
589 {
590  if (*pls)
591  return 0;
592  if (!new_variant(c, NULL, url, NULL))
593  return AVERROR(ENOMEM);
594  *pls = c->playlists[c->n_playlists - 1];
595  return 0;
596 }
597 
599  const char *url)
600 {
601 #if !CONFIG_HTTP_PROTOCOL
603 #else
604  int ret;
605  URLContext *uc = ffio_geturlcontext(*pb);
606  av_assert0(uc);
607  (*pb)->eof_reached = 0;
608  ret = ff_http_do_new_request(uc, url);
609  if (ret < 0) {
610  ff_format_io_close(s, pb);
611  }
612  return ret;
613 #endif
614 }
615 
616 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
617  AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
618 {
619  HLSContext *c = s->priv_data;
620  AVDictionary *tmp = NULL;
621  const char *proto_name = NULL;
622  int ret;
623  int is_http = 0;
624 
625  av_dict_copy(&tmp, opts, 0);
626  av_dict_copy(&tmp, opts2, 0);
627 
628  if (av_strstart(url, "crypto", NULL)) {
629  if (url[6] == '+' || url[6] == ':')
630  proto_name = avio_find_protocol_name(url + 7);
631  }
632 
633  if (!proto_name)
634  proto_name = avio_find_protocol_name(url);
635 
636  if (!proto_name)
637  return AVERROR_INVALIDDATA;
638 
639  // only http(s) & file are allowed
640  if (av_strstart(proto_name, "file", NULL)) {
641  if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
642  av_log(s, AV_LOG_ERROR,
643  "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
644  "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
645  url);
646  return AVERROR_INVALIDDATA;
647  }
648  } else if (av_strstart(proto_name, "http", NULL)) {
649  is_http = 1;
650  } else
651  return AVERROR_INVALIDDATA;
652 
653  if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
654  ;
655  else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
656  ;
657  else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
658  return AVERROR_INVALIDDATA;
659 
660  if (is_http && c->http_persistent && *pb) {
661  ret = open_url_keepalive(c->ctx, pb, url);
662  if (ret == AVERROR_EXIT) {
663  return ret;
664  } else if (ret < 0) {
665  if (ret != AVERROR_EOF)
667  "keepalive request failed for '%s' when opening url, retrying with new connection: %s\n",
668  url, av_err2str(ret));
669  ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
670  }
671  } else {
672  ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
673  }
674  if (ret >= 0) {
675  // update cookies on http response with setcookies.
676  char *new_cookies = NULL;
677 
678  if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
679  av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
680 
681  if (new_cookies)
682  av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
683  }
684 
685  av_dict_free(&tmp);
686 
687  if (is_http_out)
688  *is_http_out = is_http;
689 
690  return ret;
691 }
692 
693 static int parse_playlist(HLSContext *c, const char *url,
694  struct playlist *pls, AVIOContext *in)
695 {
696  int ret = 0, is_segment = 0, is_variant = 0;
697  int64_t duration = 0;
698  enum KeyType key_type = KEY_NONE;
699  uint8_t iv[16] = "";
700  int has_iv = 0;
701  char key[MAX_URL_SIZE] = "";
702  char line[MAX_URL_SIZE];
703  const char *ptr;
704  int close_in = 0;
705  int64_t seg_offset = 0;
706  int64_t seg_size = -1;
707  uint8_t *new_url = NULL;
708  struct variant_info variant_info;
709  char tmp_str[MAX_URL_SIZE];
710  struct segment *cur_init_section = NULL;
711  int is_http = av_strstart(url, "http", NULL);
712  struct segment **prev_segments = NULL;
713  int prev_n_segments = 0;
714  int prev_start_seq_no = -1;
715 
716  if (is_http && !in && c->http_persistent && c->playlist_pb) {
717  in = c->playlist_pb;
718  ret = open_url_keepalive(c->ctx, &c->playlist_pb, url);
719  if (ret == AVERROR_EXIT) {
720  return ret;
721  } else if (ret < 0) {
722  if (ret != AVERROR_EOF)
724  "keepalive request failed for '%s' when parsing playlist, retrying with new connection: %s\n",
725  url, av_err2str(ret));
726  in = NULL;
727  }
728  }
729 
730  if (!in) {
732  av_dict_copy(&opts, c->avio_opts, 0);
733 
734  if (c->http_persistent)
735  av_dict_set(&opts, "multiple_requests", "1", 0);
736 
737  ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
738  av_dict_free(&opts);
739  if (ret < 0)
740  return ret;
741 
742  if (is_http && c->http_persistent)
743  c->playlist_pb = in;
744  else
745  close_in = 1;
746  }
747 
748  if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
749  url = new_url;
750 
751  ff_get_chomp_line(in, line, sizeof(line));
752  if (strcmp(line, "#EXTM3U")) {
753  ret = AVERROR_INVALIDDATA;
754  goto fail;
755  }
756 
757  if (pls) {
758  prev_start_seq_no = pls->start_seq_no;
759  prev_segments = pls->segments;
760  prev_n_segments = pls->n_segments;
761  pls->segments = NULL;
762  pls->n_segments = 0;
763 
764  pls->finished = 0;
765  pls->type = PLS_TYPE_UNSPECIFIED;
766  }
767  while (!avio_feof(in)) {
768  ff_get_chomp_line(in, line, sizeof(line));
769  if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
770  is_variant = 1;
771  memset(&variant_info, 0, sizeof(variant_info));
773  &variant_info);
774  } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
775  struct key_info info = {{0}};
777  &info);
778  key_type = KEY_NONE;
779  has_iv = 0;
780  if (!strcmp(info.method, "AES-128"))
781  key_type = KEY_AES_128;
782  if (!strcmp(info.method, "SAMPLE-AES"))
783  key_type = KEY_SAMPLE_AES;
784  if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
785  ff_hex_to_data(iv, info.iv + 2);
786  has_iv = 1;
787  }
788  av_strlcpy(key, info.uri, sizeof(key));
789  } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
790  struct rendition_info info = {{0}};
792  &info);
793  new_rendition(c, &info, url);
794  } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
795  ret = ensure_playlist(c, &pls, url);
796  if (ret < 0)
797  goto fail;
798  pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
799  } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
800  ret = ensure_playlist(c, &pls, url);
801  if (ret < 0)
802  goto fail;
803  pls->start_seq_no = atoi(ptr);
804  } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
805  ret = ensure_playlist(c, &pls, url);
806  if (ret < 0)
807  goto fail;
808  if (!strcmp(ptr, "EVENT"))
809  pls->type = PLS_TYPE_EVENT;
810  else if (!strcmp(ptr, "VOD"))
811  pls->type = PLS_TYPE_VOD;
812  } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
813  struct init_section_info info = {{0}};
814  ret = ensure_playlist(c, &pls, url);
815  if (ret < 0)
816  goto fail;
818  &info);
819  cur_init_section = new_init_section(pls, &info, url);
820  cur_init_section->key_type = key_type;
821  if (has_iv) {
822  memcpy(cur_init_section->iv, iv, sizeof(iv));
823  } else {
824  int seq = pls->start_seq_no + pls->n_segments;
825  memset(cur_init_section->iv, 0, sizeof(cur_init_section->iv));
826  AV_WB32(cur_init_section->iv + 12, seq);
827  }
828 
829  if (key_type != KEY_NONE) {
830  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
831  cur_init_section->key = av_strdup(tmp_str);
832  if (!cur_init_section->key) {
833  av_free(cur_init_section);
834  ret = AVERROR(ENOMEM);
835  goto fail;
836  }
837  } else {
838  cur_init_section->key = NULL;
839  }
840 
841  } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
842  if (pls)
843  pls->finished = 1;
844  } else if (av_strstart(line, "#EXTINF:", &ptr)) {
845  is_segment = 1;
846  duration = atof(ptr) * AV_TIME_BASE;
847  } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
848  seg_size = strtoll(ptr, NULL, 10);
849  ptr = strchr(ptr, '@');
850  if (ptr)
851  seg_offset = strtoll(ptr+1, NULL, 10);
852  } else if (av_strstart(line, "#", NULL)) {
853  av_log(c->ctx, AV_LOG_INFO, "Skip ('%s')\n", line);
854  continue;
855  } else if (line[0]) {
856  if (is_variant) {
857  if (!new_variant(c, &variant_info, line, url)) {
858  ret = AVERROR(ENOMEM);
859  goto fail;
860  }
861  is_variant = 0;
862  }
863  if (is_segment) {
864  struct segment *seg;
865  ret = ensure_playlist(c, &pls, url);
866  if (ret < 0)
867  goto fail;
868  seg = av_malloc(sizeof(struct segment));
869  if (!seg) {
870  ret = AVERROR(ENOMEM);
871  goto fail;
872  }
873  seg->duration = duration;
874  seg->key_type = key_type;
875  if (has_iv) {
876  memcpy(seg->iv, iv, sizeof(iv));
877  } else {
878  int seq = pls->start_seq_no + pls->n_segments;
879  memset(seg->iv, 0, sizeof(seg->iv));
880  AV_WB32(seg->iv + 12, seq);
881  }
882 
883  if (key_type != KEY_NONE) {
884  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
885  seg->key = av_strdup(tmp_str);
886  if (!seg->key) {
887  av_free(seg);
888  ret = AVERROR(ENOMEM);
889  goto fail;
890  }
891  } else {
892  seg->key = NULL;
893  }
894 
895  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
896  seg->url = av_strdup(tmp_str);
897  if (!seg->url) {
898  av_free(seg->key);
899  av_free(seg);
900  ret = AVERROR(ENOMEM);
901  goto fail;
902  }
903 
904  dynarray_add(&pls->segments, &pls->n_segments, seg);
905  is_segment = 0;
906 
907  seg->size = seg_size;
908  if (seg_size >= 0) {
909  seg->url_offset = seg_offset;
910  seg_offset += seg_size;
911  seg_size = -1;
912  } else {
913  seg->url_offset = 0;
914  seg_offset = 0;
915  }
916 
917  seg->init_section = cur_init_section;
918  }
919  }
920  }
921  if (prev_segments) {
922  if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
923  int64_t prev_timestamp = c->first_timestamp;
924  int i, diff = pls->start_seq_no - prev_start_seq_no;
925  for (i = 0; i < prev_n_segments && i < diff; i++) {
926  c->first_timestamp += prev_segments[i]->duration;
927  }
928  av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%d -> %d)"
929  " reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
930  prev_start_seq_no, pls->start_seq_no,
931  prev_timestamp, c->first_timestamp);
932  } else if (pls->start_seq_no < prev_start_seq_no) {
933  av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %d -> %d\n",
934  prev_start_seq_no, pls->start_seq_no);
935  }
936  free_segment_dynarray(prev_segments, prev_n_segments);
937  av_freep(&prev_segments);
938  }
939  if (pls)
941 
942 fail:
943  av_free(new_url);
944  if (close_in)
945  ff_format_io_close(c->ctx, &in);
946  c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
947  if (!c->n_variants || !c->variants[0]->n_playlists ||
948  !(c->variants[0]->playlists[0]->finished ||
949  c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
951  return ret;
952 }
953 
954 static struct segment *current_segment(struct playlist *pls)
955 {
956  return pls->segments[pls->cur_seq_no - pls->start_seq_no];
957 }
958 
959 static struct segment *next_segment(struct playlist *pls)
960 {
961  int n = pls->cur_seq_no - pls->start_seq_no + 1;
962  if (n >= pls->n_segments)
963  return NULL;
964  return pls->segments[n];
965 }
966 
967 static int read_from_url(struct playlist *pls, struct segment *seg,
968  uint8_t *buf, int buf_size)
969 {
970  int ret;
971 
972  /* limit read if the segment was only a part of a file */
973  if (seg->size >= 0)
974  buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
975 
976  ret = avio_read(pls->input, buf, buf_size);
977  if (ret > 0)
978  pls->cur_seg_offset += ret;
979 
980  return ret;
981 }
982 
983 /* Parse the raw ID3 data and pass contents to caller */
985  AVDictionary **metadata, int64_t *dts,
986  ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
987 {
988  static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
989  ID3v2ExtraMeta *meta;
990 
991  ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
992  for (meta = *extra_meta; meta; meta = meta->next) {
993  if (!strcmp(meta->tag, "PRIV")) {
994  ID3v2ExtraMetaPRIV *priv = meta->data;
995  if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
996  /* 33-bit MPEG timestamp */
997  int64_t ts = AV_RB64(priv->data);
998  av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
999  if ((ts & ~((1ULL << 33) - 1)) == 0)
1000  *dts = ts;
1001  else
1002  av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
1003  }
1004  } else if (!strcmp(meta->tag, "APIC") && apic)
1005  *apic = meta->data;
1006  }
1007 }
1008 
1009 /* Check if the ID3 metadata contents have changed */
1010 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
1011  ID3v2ExtraMetaAPIC *apic)
1012 {
1013  AVDictionaryEntry *entry = NULL;
1014  AVDictionaryEntry *oldentry;
1015  /* check that no keys have changed values */
1016  while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
1017  oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
1018  if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
1019  return 1;
1020  }
1021 
1022  /* check if apic appeared */
1023  if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
1024  return 1;
1025 
1026  if (apic) {
1027  int size = pls->ctx->streams[1]->attached_pic.size;
1028  if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
1029  return 1;
1030 
1031  if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
1032  return 1;
1033  }
1034 
1035  return 0;
1036 }
1037 
1038 /* Parse ID3 data and handle the found data */
1039 static void handle_id3(AVIOContext *pb, struct playlist *pls)
1040 {
1041  AVDictionary *metadata = NULL;
1042  ID3v2ExtraMetaAPIC *apic = NULL;
1043  ID3v2ExtraMeta *extra_meta = NULL;
1044  int64_t timestamp = AV_NOPTS_VALUE;
1045 
1046  parse_id3(pls->ctx, pb, &metadata, &timestamp, &apic, &extra_meta);
1047 
1048  if (timestamp != AV_NOPTS_VALUE) {
1049  pls->id3_mpegts_timestamp = timestamp;
1050  pls->id3_offset = 0;
1051  }
1052 
1053  if (!pls->id3_found) {
1054  /* initial ID3 tags */
1056  pls->id3_found = 1;
1057 
1058  /* get picture attachment and set text metadata */
1059  if (pls->ctx->nb_streams)
1060  ff_id3v2_parse_apic(pls->ctx, &extra_meta);
1061  else
1062  /* demuxer not yet opened, defer picture attachment */
1063  pls->id3_deferred_extra = extra_meta;
1064 
1065  ff_id3v2_parse_priv_dict(&metadata, &extra_meta);
1066  av_dict_copy(&pls->ctx->metadata, metadata, 0);
1067  pls->id3_initial = metadata;
1068 
1069  } else {
1070  if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
1071  avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
1072  pls->id3_changed = 1;
1073  }
1074  av_dict_free(&metadata);
1075  }
1076 
1077  if (!pls->id3_deferred_extra)
1078  ff_id3v2_free_extra_meta(&extra_meta);
1079 }
1080 
1081 static void intercept_id3(struct playlist *pls, uint8_t *buf,
1082  int buf_size, int *len)
1083 {
1084  /* intercept id3 tags, we do not want to pass them to the raw
1085  * demuxer on all segment switches */
1086  int bytes;
1087  int id3_buf_pos = 0;
1088  int fill_buf = 0;
1089  struct segment *seg = current_segment(pls);
1090 
1091  /* gather all the id3 tags */
1092  while (1) {
1093  /* see if we can retrieve enough data for ID3 header */
1094  if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
1095  bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
1096  if (bytes > 0) {
1097 
1098  if (bytes == ID3v2_HEADER_SIZE - *len)
1099  /* no EOF yet, so fill the caller buffer again after
1100  * we have stripped the ID3 tags */
1101  fill_buf = 1;
1102 
1103  *len += bytes;
1104 
1105  } else if (*len <= 0) {
1106  /* error/EOF */
1107  *len = bytes;
1108  fill_buf = 0;
1109  }
1110  }
1111 
1112  if (*len < ID3v2_HEADER_SIZE)
1113  break;
1114 
1115  if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
1116  int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
1117  int taglen = ff_id3v2_tag_len(buf);
1118  int tag_got_bytes = FFMIN(taglen, *len);
1119  int remaining = taglen - tag_got_bytes;
1120 
1121  if (taglen > maxsize) {
1122  av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
1123  taglen, maxsize);
1124  break;
1125  }
1126 
1127  /*
1128  * Copy the id3 tag to our temporary id3 buffer.
1129  * We could read a small id3 tag directly without memcpy, but
1130  * we would still need to copy the large tags, and handling
1131  * both of those cases together with the possibility for multiple
1132  * tags would make the handling a bit complex.
1133  */
1134  pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
1135  if (!pls->id3_buf)
1136  break;
1137  memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
1138  id3_buf_pos += tag_got_bytes;
1139 
1140  /* strip the intercepted bytes */
1141  *len -= tag_got_bytes;
1142  memmove(buf, buf + tag_got_bytes, *len);
1143  av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
1144 
1145  if (remaining > 0) {
1146  /* read the rest of the tag in */
1147  if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
1148  break;
1149  id3_buf_pos += remaining;
1150  av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
1151  }
1152 
1153  } else {
1154  /* no more ID3 tags */
1155  break;
1156  }
1157  }
1158 
1159  /* re-fill buffer for the caller unless EOF */
1160  if (*len >= 0 && (fill_buf || *len == 0)) {
1161  bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
1162 
1163  /* ignore error if we already had some data */
1164  if (bytes >= 0)
1165  *len += bytes;
1166  else if (*len == 0)
1167  *len = bytes;
1168  }
1169 
1170  if (pls->id3_buf) {
1171  /* Now parse all the ID3 tags */
1172  AVIOContext id3ioctx;
1173  ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
1174  handle_id3(&id3ioctx, pls);
1175  }
1176 
1177  if (pls->is_id3_timestamped == -1)
1179 }
1180 
1181 static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
1182 {
1183  AVDictionary *opts = NULL;
1184  int ret;
1185  int is_http = 0;
1186 
1187  if (c->http_persistent)
1188  av_dict_set(&opts, "multiple_requests", "1", 0);
1189 
1190  if (seg->size >= 0) {
1191  /* try to restrict the HTTP request to the part we want
1192  * (if this is in fact a HTTP request) */
1193  av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1194  av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1195  }
1196 
1197  av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
1198  seg->url, seg->url_offset, pls->index);
1199 
1200  if (seg->key_type == KEY_NONE) {
1201  ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
1202  } else if (seg->key_type == KEY_AES_128) {
1203  char iv[33], key[33], url[MAX_URL_SIZE];
1204  if (strcmp(seg->key, pls->key_url)) {
1205  AVIOContext *pb = NULL;
1206  if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
1207  ret = avio_read(pb, pls->key, sizeof(pls->key));
1208  if (ret != sizeof(pls->key)) {
1209  av_log(pls->parent, AV_LOG_ERROR, "Unable to read key file %s\n",
1210  seg->key);
1211  }
1212  ff_format_io_close(pls->parent, &pb);
1213  } else {
1214  av_log(pls->parent, AV_LOG_ERROR, "Unable to open key file %s\n",
1215  seg->key);
1216  }
1217  av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
1218  }
1219  ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
1220  ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
1221  iv[32] = key[32] = '\0';
1222  if (strstr(seg->url, "://"))
1223  snprintf(url, sizeof(url), "crypto+%s", seg->url);
1224  else
1225  snprintf(url, sizeof(url), "crypto:%s", seg->url);
1226 
1227  av_dict_set(&opts, "key", key, 0);
1228  av_dict_set(&opts, "iv", iv, 0);
1229 
1230  ret = open_url(pls->parent, in, url, c->avio_opts, opts, &is_http);
1231  if (ret < 0) {
1232  goto cleanup;
1233  }
1234  ret = 0;
1235  } else if (seg->key_type == KEY_SAMPLE_AES) {
1236  av_log(pls->parent, AV_LOG_ERROR,
1237  "SAMPLE-AES encryption is not supported yet\n");
1238  ret = AVERROR_PATCHWELCOME;
1239  }
1240  else
1241  ret = AVERROR(ENOSYS);
1242 
1243  /* Seek to the requested position. If this was a HTTP request, the offset
1244  * should already be where want it to, but this allows e.g. local testing
1245  * without a HTTP server.
1246  *
1247  * This is not done for HTTP at all as avio_seek() does internal bookkeeping
1248  * of file offset which is out-of-sync with the actual offset when "offset"
1249  * AVOption is used with http protocol, causing the seek to not be a no-op
1250  * as would be expected. Wrong offset received from the server will not be
1251  * noticed without the call, though.
1252  */
1253  if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
1254  int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
1255  if (seekret < 0) {
1256  av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
1257  ret = seekret;
1258  ff_format_io_close(pls->parent, in);
1259  }
1260  }
1261 
1262 cleanup:
1263  av_dict_free(&opts);
1264  pls->cur_seg_offset = 0;
1265  return ret;
1266 }
1267 
1268 static int update_init_section(struct playlist *pls, struct segment *seg)
1269 {
1270  static const int max_init_section_size = 1024*1024;
1271  HLSContext *c = pls->parent->priv_data;
1272  int64_t sec_size;
1273  int64_t urlsize;
1274  int ret;
1275 
1276  if (seg->init_section == pls->cur_init_section)
1277  return 0;
1278 
1279  pls->cur_init_section = NULL;
1280 
1281  if (!seg->init_section)
1282  return 0;
1283 
1284  ret = open_input(c, pls, seg->init_section, &pls->input);
1285  if (ret < 0) {
1287  "Failed to open an initialization section in playlist %d\n",
1288  pls->index);
1289  return ret;
1290  }
1291 
1292  if (seg->init_section->size >= 0)
1293  sec_size = seg->init_section->size;
1294  else if ((urlsize = avio_size(pls->input)) >= 0)
1295  sec_size = urlsize;
1296  else
1297  sec_size = max_init_section_size;
1298 
1299  av_log(pls->parent, AV_LOG_DEBUG,
1300  "Downloading an initialization section of size %"PRId64"\n",
1301  sec_size);
1302 
1303  sec_size = FFMIN(sec_size, max_init_section_size);
1304 
1305  av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1306 
1307  ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
1308  pls->init_sec_buf_size);
1309  ff_format_io_close(pls->parent, &pls->input);
1310 
1311  if (ret < 0)
1312  return ret;
1313 
1314  pls->cur_init_section = seg->init_section;
1315  pls->init_sec_data_len = ret;
1316  pls->init_sec_buf_read_offset = 0;
1317 
1318  /* spec says audio elementary streams do not have media initialization
1319  * sections, so there should be no ID3 timestamps */
1320  pls->is_id3_timestamped = 0;
1321 
1322  return 0;
1323 }
1324 
1325 static int64_t default_reload_interval(struct playlist *pls)
1326 {
1327  return pls->n_segments > 0 ?
1328  pls->segments[pls->n_segments - 1]->duration :
1329  pls->target_duration;
1330 }
1331 
1332 static int playlist_needed(struct playlist *pls)
1333 {
1334  AVFormatContext *s = pls->parent;
1335  int i, j;
1336  int stream_needed = 0;
1337  int first_st;
1338 
1339  /* If there is no context or streams yet, the playlist is needed */
1340  if (!pls->ctx || !pls->n_main_streams)
1341  return 1;
1342 
1343  /* check if any of the streams in the playlist are needed */
1344  for (i = 0; i < pls->n_main_streams; i++) {
1345  if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
1346  stream_needed = 1;
1347  break;
1348  }
1349  }
1350 
1351  /* If all streams in the playlist were discarded, the playlist is not
1352  * needed (regardless of whether whole programs are discarded or not). */
1353  if (!stream_needed)
1354  return 0;
1355 
1356  /* Otherwise, check if all the programs (variants) this playlist is in are
1357  * discarded. Since all streams in the playlist are part of the same programs
1358  * we can just check the programs of the first stream. */
1359 
1360  first_st = pls->main_streams[0]->index;
1361 
1362  for (i = 0; i < s->nb_programs; i++) {
1363  AVProgram *program = s->programs[i];
1364  if (program->discard < AVDISCARD_ALL) {
1365  for (j = 0; j < program->nb_stream_indexes; j++) {
1366  if (program->stream_index[j] == first_st) {
1367  /* playlist is in an undiscarded program */
1368  return 1;
1369  }
1370  }
1371  }
1372  }
1373 
1374  /* some streams were not discarded but all the programs were */
1375  return 0;
1376 }
1377 
1378 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1379 {
1380  struct playlist *v = opaque;
1381  HLSContext *c = v->parent->priv_data;
1382  int ret;
1383  int just_opened = 0;
1384  int reload_count = 0;
1385  struct segment *seg;
1386 
1387 restart:
1388  if (!v->needed)
1389  return AVERROR_EOF;
1390 
1391  if (!v->input || (c->http_persistent && v->input_read_done)) {
1392  int64_t reload_interval;
1393 
1394  /* Check that the playlist is still needed before opening a new
1395  * segment. */
1396  v->needed = playlist_needed(v);
1397 
1398  if (!v->needed) {
1399  av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
1400  v->index, v->url);
1401  return AVERROR_EOF;
1402  }
1403 
1404  /* If this is a live stream and the reload interval has elapsed since
1405  * the last playlist reload, reload the playlists now. */
1406  reload_interval = default_reload_interval(v);
1407 
1408 reload:
1409  reload_count++;
1410  if (reload_count > c->max_reload)
1411  return AVERROR_EOF;
1412  if (!v->finished &&
1413  av_gettime_relative() - v->last_load_time >= reload_interval) {
1414  if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1415  if (ret != AVERROR_EXIT)
1416  av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1417  v->index);
1418  return ret;
1419  }
1420  /* If we need to reload the playlist again below (if
1421  * there's still no more segments), switch to a reload
1422  * interval of half the target duration. */
1423  reload_interval = v->target_duration / 2;
1424  }
1425  if (v->cur_seq_no < v->start_seq_no) {
1427  "skipping %d segments ahead, expired from playlists\n",
1428  v->start_seq_no - v->cur_seq_no);
1429  v->cur_seq_no = v->start_seq_no;
1430  }
1431  if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1432  if (v->finished)
1433  return AVERROR_EOF;
1434  while (av_gettime_relative() - v->last_load_time < reload_interval) {
1436  return AVERROR_EXIT;
1437  av_usleep(100*1000);
1438  }
1439  /* Enough time has elapsed since the last reload */
1440  goto reload;
1441  }
1442 
1443  v->input_read_done = 0;
1444  seg = current_segment(v);
1445 
1446  /* load/update Media Initialization Section, if any */
1447  ret = update_init_section(v, seg);
1448  if (ret)
1449  return ret;
1450 
1451  if (c->http_multiple == 1 && v->input_next_requested) {
1452  FFSWAP(AVIOContext *, v->input, v->input_next);
1453  v->input_next_requested = 0;
1454  ret = 0;
1455  } else {
1456  ret = open_input(c, v, seg, &v->input);
1457  }
1458  if (ret < 0) {
1460  return AVERROR_EXIT;
1461  av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
1462  v->cur_seq_no,
1463  v->index);
1464  v->cur_seq_no += 1;
1465  goto reload;
1466  }
1467  just_opened = 1;
1468  }
1469 
1470  if (c->http_multiple == -1) {
1471  uint8_t *http_version_opt = NULL;
1472  int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
1473  if (r >= 0) {
1474  c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
1475  av_freep(&http_version_opt);
1476  }
1477  }
1478 
1479  seg = next_segment(v);
1480  if (c->http_multiple == 1 && !v->input_next_requested &&
1481  seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1482  ret = open_input(c, v, seg, &v->input_next);
1483  if (ret < 0) {
1485  return AVERROR_EXIT;
1486  av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
1487  v->cur_seq_no + 1,
1488  v->index);
1489  } else {
1490  v->input_next_requested = 1;
1491  }
1492  }
1493 
1495  /* Push init section out first before first actual segment */
1496  int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1497  memcpy(buf, v->init_sec_buf, copy_size);
1498  v->init_sec_buf_read_offset += copy_size;
1499  return copy_size;
1500  }
1501 
1502  seg = current_segment(v);
1503  ret = read_from_url(v, seg, buf, buf_size);
1504  if (ret > 0) {
1505  if (just_opened && v->is_id3_timestamped != 0) {
1506  /* Intercept ID3 tags here, elementary audio streams are required
1507  * to convey timestamps using them in the beginning of each segment. */
1508  intercept_id3(v, buf, buf_size, &ret);
1509  }
1510 
1511  return ret;
1512  }
1513  if (c->http_persistent &&
1514  seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1515  v->input_read_done = 1;
1516  } else {
1517  ff_format_io_close(v->parent, &v->input);
1518  }
1519  v->cur_seq_no++;
1520 
1521  c->cur_seq_no = v->cur_seq_no;
1522 
1523  goto restart;
1524 }
1525 
1526 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1527  enum AVMediaType type, const char *group_id)
1528 {
1529  int i;
1530 
1531  for (i = 0; i < c->n_renditions; i++) {
1532  struct rendition *rend = c->renditions[i];
1533 
1534  if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1535 
1536  if (rend->playlist)
1537  /* rendition is an external playlist
1538  * => add the playlist to the variant */
1539  dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1540  else
1541  /* rendition is part of the variant main Media Playlist
1542  * => add the rendition to the main Media Playlist */
1543  dynarray_add(&var->playlists[0]->renditions,
1544  &var->playlists[0]->n_renditions,
1545  rend);
1546  }
1547  }
1548 }
1549 
1551  enum AVMediaType type)
1552 {
1553  int rend_idx = 0;
1554  int i;
1555 
1556  for (i = 0; i < pls->n_main_streams; i++) {
1557  AVStream *st = pls->main_streams[i];
1558 
1559  if (st->codecpar->codec_type != type)
1560  continue;
1561 
1562  for (; rend_idx < pls->n_renditions; rend_idx++) {
1563  struct rendition *rend = pls->renditions[rend_idx];
1564 
1565  if (rend->type != type)
1566  continue;
1567 
1568  if (rend->language[0])
1569  av_dict_set(&st->metadata, "language", rend->language, 0);
1570  if (rend->name[0])
1571  av_dict_set(&st->metadata, "comment", rend->name, 0);
1572 
1573  st->disposition |= rend->disposition;
1574  }
1575  if (rend_idx >=pls->n_renditions)
1576  break;
1577  }
1578 }
1579 
1580 /* if timestamp was in valid range: returns 1 and sets seq_no
1581  * if not: returns 0 and sets seq_no to closest segment */
1583  int64_t timestamp, int *seq_no)
1584 {
1585  int i;
1586  int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1587  0 : c->first_timestamp;
1588 
1589  if (timestamp < pos) {
1590  *seq_no = pls->start_seq_no;
1591  return 0;
1592  }
1593 
1594  for (i = 0; i < pls->n_segments; i++) {
1595  int64_t diff = pos + pls->segments[i]->duration - timestamp;
1596  if (diff > 0) {
1597  *seq_no = pls->start_seq_no + i;
1598  return 1;
1599  }
1600  pos += pls->segments[i]->duration;
1601  }
1602 
1603  *seq_no = pls->start_seq_no + pls->n_segments - 1;
1604 
1605  return 0;
1606 }
1607 
1608 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1609 {
1610  int seq_no;
1611 
1612  if (!pls->finished && !c->first_packet &&
1614  /* reload the playlist since it was suspended */
1615  parse_playlist(c, pls->url, pls, NULL);
1616 
1617  /* If playback is already in progress (we are just selecting a new
1618  * playlist) and this is a complete file, find the matching segment
1619  * by counting durations. */
1620  if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1621  find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1622  return seq_no;
1623  }
1624 
1625  if (!pls->finished) {
1626  if (!c->first_packet && /* we are doing a segment selection during playback */
1627  c->cur_seq_no >= pls->start_seq_no &&
1628  c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1629  /* While spec 3.4.3 says that we cannot assume anything about the
1630  * content at the same sequence number on different playlists,
1631  * in practice this seems to work and doing it otherwise would
1632  * require us to download a segment to inspect its timestamps. */
1633  return c->cur_seq_no;
1634 
1635  /* If this is a live stream, start live_start_index segments from the
1636  * start or end */
1637  if (c->live_start_index < 0)
1638  return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
1639  else
1640  return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
1641  }
1642 
1643  /* Otherwise just start on the first segment. */
1644  return pls->start_seq_no;
1645 }
1646 
1648 {
1649  HLSContext *c = s->priv_data;
1650  static const char * const opts[] = {
1651  "headers", "http_proxy", "user_agent", "cookies", "referer", "rw_timeout", NULL };
1652  const char * const * opt = opts;
1653  uint8_t *buf;
1654  int ret = 0;
1655 
1656  while (*opt) {
1657  if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
1658  ret = av_dict_set(&c->avio_opts, *opt, buf,
1660  if (ret < 0)
1661  return ret;
1662  }
1663  opt++;
1664  }
1665 
1666  return ret;
1667 }
1668 
1669 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1670  int flags, AVDictionary **opts)
1671 {
1672  av_log(s, AV_LOG_ERROR,
1673  "A HLS playlist item '%s' referred to an external file '%s'. "
1674  "Opening this file was forbidden for security reasons\n",
1675  s->url, url);
1676  return AVERROR(EPERM);
1677 }
1678 
1679 static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
1680 {
1681  HLSContext *c = s->priv_data;
1682  int i, j;
1683  int bandwidth = -1;
1684 
1685  for (i = 0; i < c->n_variants; i++) {
1686  struct variant *v = c->variants[i];
1687 
1688  for (j = 0; j < v->n_playlists; j++) {
1689  if (v->playlists[j] != pls)
1690  continue;
1691 
1692  av_program_add_stream_index(s, i, stream->index);
1693 
1694  if (bandwidth < 0)
1695  bandwidth = v->bandwidth;
1696  else if (bandwidth != v->bandwidth)
1697  bandwidth = -1; /* stream in multiple variants with different bandwidths */
1698  }
1699  }
1700 
1701  if (bandwidth >= 0)
1702  av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
1703 }
1704 
1706 {
1707  int err;
1708 
1709  err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
1710  if (err < 0)
1711  return err;
1712 
1713  if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1714  avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1715  else
1717 
1718  st->internal->need_context_update = 1;
1719 
1720  return 0;
1721 }
1722 
1723 /* add new subdemuxer streams to our context, if any */
1725 {
1726  int err;
1727 
1728  while (pls->n_main_streams < pls->ctx->nb_streams) {
1729  int ist_idx = pls->n_main_streams;
1730  AVStream *st = avformat_new_stream(s, NULL);
1731  AVStream *ist = pls->ctx->streams[ist_idx];
1732 
1733  if (!st)
1734  return AVERROR(ENOMEM);
1735 
1736  st->id = pls->index;
1737  dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
1738 
1739  add_stream_to_programs(s, pls, st);
1740 
1741  err = set_stream_info_from_input_stream(st, pls, ist);
1742  if (err < 0)
1743  return err;
1744  }
1745 
1746  return 0;
1747 }
1748 
1750 {
1751  HLSContext *c = s->priv_data;
1752  int flag_needed = 0;
1753  int i;
1754 
1755  for (i = 0; i < c->n_playlists; i++) {
1756  struct playlist *pls = c->playlists[i];
1757 
1758  if (pls->has_noheader_flag) {
1759  flag_needed = 1;
1760  break;
1761  }
1762  }
1763 
1764  if (flag_needed)
1766  else
1768 }
1769 
1771 {
1772  HLSContext *c = s->priv_data;
1773 
1774  free_playlist_list(c);
1775  free_variant_list(c);
1777 
1778  av_dict_free(&c->avio_opts);
1780 
1781  return 0;
1782 }
1783 
1785 {
1786  HLSContext *c = s->priv_data;
1787  int ret = 0, i;
1788  int highest_cur_seq_no = 0;
1789 
1790  c->ctx = s;
1792 
1793  c->first_packet = 1;
1796 
1797  if ((ret = save_avio_options(s)) < 0)
1798  goto fail;
1799 
1800  /* XXX: Some HLS servers don't like being sent the range header,
1801  in this case, need to setting http_seekable = 0 to disable
1802  the range header */
1803  av_dict_set_int(&c->avio_opts, "seekable", c->http_seekable, 0);
1804 
1805  if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
1806  goto fail;
1807 
1808  if (c->n_variants == 0) {
1809  av_log(s, AV_LOG_WARNING, "Empty playlist\n");
1810  ret = AVERROR_EOF;
1811  goto fail;
1812  }
1813  /* If the playlist only contained playlists (Master Playlist),
1814  * parse each individual playlist. */
1815  if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1816  for (i = 0; i < c->n_playlists; i++) {
1817  struct playlist *pls = c->playlists[i];
1818  if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
1819  goto fail;
1820  }
1821  }
1822 
1823  if (c->variants[0]->playlists[0]->n_segments == 0) {
1824  av_log(s, AV_LOG_WARNING, "Empty segment\n");
1825  ret = AVERROR_EOF;
1826  goto fail;
1827  }
1828 
1829  /* If this isn't a live stream, calculate the total duration of the
1830  * stream. */
1831  if (c->variants[0]->playlists[0]->finished) {
1832  int64_t duration = 0;
1833  for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1834  duration += c->variants[0]->playlists[0]->segments[i]->duration;
1835  s->duration = duration;
1836  }
1837 
1838  /* Associate renditions with variants */
1839  for (i = 0; i < c->n_variants; i++) {
1840  struct variant *var = c->variants[i];
1841 
1842  if (var->audio_group[0])
1844  if (var->video_group[0])
1846  if (var->subtitles_group[0])
1848  }
1849 
1850  /* Create a program for each variant */
1851  for (i = 0; i < c->n_variants; i++) {
1852  struct variant *v = c->variants[i];
1853  AVProgram *program;
1854 
1855  program = av_new_program(s, i);
1856  if (!program)
1857  goto fail;
1858  av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1859  }
1860 
1861  /* Select the starting segments */
1862  for (i = 0; i < c->n_playlists; i++) {
1863  struct playlist *pls = c->playlists[i];
1864 
1865  if (pls->n_segments == 0)
1866  continue;
1867 
1868  pls->cur_seq_no = select_cur_seq_no(c, pls);
1869  highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
1870  }
1871 
1872  /* Open the demuxer for each playlist */
1873  for (i = 0; i < c->n_playlists; i++) {
1874  struct playlist *pls = c->playlists[i];
1875  ff_const59 AVInputFormat *in_fmt = NULL;
1876 
1877  if (!(pls->ctx = avformat_alloc_context())) {
1878  ret = AVERROR(ENOMEM);
1879  goto fail;
1880  }
1881 
1882  if (pls->n_segments == 0)
1883  continue;
1884 
1885  pls->index = i;
1886  pls->needed = 1;
1887  pls->parent = s;
1888 
1889  /*
1890  * If this is a live stream and this playlist looks like it is one segment
1891  * behind, try to sync it up so that every substream starts at the same
1892  * time position (so e.g. avformat_find_stream_info() will see packets from
1893  * all active streams within the first few seconds). This is not very generic,
1894  * though, as the sequence numbers are technically independent.
1895  */
1896  if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
1897  highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
1898  pls->cur_seq_no = highest_cur_seq_no;
1899  }
1900 
1902  if (!pls->read_buffer){
1903  ret = AVERROR(ENOMEM);
1904  avformat_free_context(pls->ctx);
1905  pls->ctx = NULL;
1906  goto fail;
1907  }
1908  ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1909  read_data, NULL, NULL);
1910  pls->pb.seekable = 0;
1911  ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1912  NULL, 0, 0);
1913  if (ret < 0) {
1914  /* Free the ctx - it isn't initialized properly at this point,
1915  * so avformat_close_input shouldn't be called. If
1916  * avformat_open_input fails below, it frees and zeros the
1917  * context, so it doesn't need any special treatment like this. */
1918  av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1919  avformat_free_context(pls->ctx);
1920  pls->ctx = NULL;
1921  goto fail;
1922  }
1923  pls->ctx->pb = &pls->pb;
1924  pls->ctx->io_open = nested_io_open;
1925  pls->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
1926 
1927  if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1928  goto fail;
1929 
1930  ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1931  if (ret < 0)
1932  goto fail;
1933 
1934  if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1939  pls->id3_deferred_extra = NULL;
1940  }
1941 
1942  if (pls->is_id3_timestamped == -1)
1943  av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1944 
1945  /*
1946  * For ID3 timestamped raw audio streams we need to detect the packet
1947  * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
1948  * but for other streams we can rely on our user calling avformat_find_stream_info()
1949  * on us if they want to.
1950  */
1951  if (pls->is_id3_timestamped || (pls->n_renditions > 0 && pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) {
1952  ret = avformat_find_stream_info(pls->ctx, NULL);
1953  if (ret < 0)
1954  goto fail;
1955  }
1956 
1957  pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
1958 
1959  /* Create new AVStreams for each stream in this playlist */
1960  ret = update_streams_from_subdemuxer(s, pls);
1961  if (ret < 0)
1962  goto fail;
1963 
1964  /*
1965  * Copy any metadata from playlist to main streams, but do not set
1966  * event flags.
1967  */
1968  if (pls->n_main_streams)
1969  av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);
1970 
1974  }
1975 
1977 
1978  return 0;
1979 fail:
1980  hls_close(s);
1981  return ret;
1982 }
1983 
1985 {
1986  HLSContext *c = s->priv_data;
1987  int i, changed = 0;
1988  int cur_needed;
1989 
1990  /* Check if any new streams are needed */
1991  for (i = 0; i < c->n_playlists; i++) {
1992  struct playlist *pls = c->playlists[i];
1993 
1994  cur_needed = playlist_needed(c->playlists[i]);
1995 
1996  if (cur_needed && !pls->needed) {
1997  pls->needed = 1;
1998  changed = 1;
1999  pls->cur_seq_no = select_cur_seq_no(c, pls);
2000  pls->pb.eof_reached = 0;
2001  if (c->cur_timestamp != AV_NOPTS_VALUE) {
2002  /* catch up */
2003  pls->seek_timestamp = c->cur_timestamp;
2004  pls->seek_flags = AVSEEK_FLAG_ANY;
2005  pls->seek_stream_index = -1;
2006  }
2007  av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
2008  } else if (first && !cur_needed && pls->needed) {
2009  if (pls->input)
2010  ff_format_io_close(pls->parent, &pls->input);
2011  pls->input_read_done = 0;
2012  if (pls->input_next)
2013  ff_format_io_close(pls->parent, &pls->input_next);
2014  pls->input_next_requested = 0;
2015  pls->needed = 0;
2016  changed = 1;
2017  av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
2018  }
2019  }
2020  return changed;
2021 }
2022 
2024 {
2025  if (pls->id3_offset >= 0) {
2026  pls->pkt.dts = pls->id3_mpegts_timestamp +
2027  av_rescale_q(pls->id3_offset,
2028  pls->ctx->streams[pls->pkt.stream_index]->time_base,
2030  if (pls->pkt.duration)
2031  pls->id3_offset += pls->pkt.duration;
2032  else
2033  pls->id3_offset = -1;
2034  } else {
2035  /* there have been packets with unknown duration
2036  * since the last id3 tag, should not normally happen */
2037  pls->pkt.dts = AV_NOPTS_VALUE;
2038  }
2039 
2040  if (pls->pkt.duration)
2041  pls->pkt.duration = av_rescale_q(pls->pkt.duration,
2042  pls->ctx->streams[pls->pkt.stream_index]->time_base,
2044 
2045  pls->pkt.pts = AV_NOPTS_VALUE;
2046 }
2047 
2048 static AVRational get_timebase(struct playlist *pls)
2049 {
2050  if (pls->is_id3_timestamped)
2051  return MPEG_TIME_BASE_Q;
2052 
2053  return pls->ctx->streams[pls->pkt.stream_index]->time_base;
2054 }
2055 
2056 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
2057  int64_t ts_b, struct playlist *pls_b)
2058 {
2059  int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
2060  int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
2061 
2062  return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
2063 }
2064 
2066 {
2067  HLSContext *c = s->priv_data;
2068  int ret, i, minplaylist = -1;
2069 
2071  c->first_packet = 0;
2072 
2073  for (i = 0; i < c->n_playlists; i++) {
2074  struct playlist *pls = c->playlists[i];
2075  /* Make sure we've got one buffered packet from each open playlist
2076  * stream */
2077  if (pls->needed && !pls->pkt.data) {
2078  while (1) {
2079  int64_t ts_diff;
2080  AVRational tb;
2081  ret = av_read_frame(pls->ctx, &pls->pkt);
2082  if (ret < 0) {
2083  if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
2084  return ret;
2085  reset_packet(&pls->pkt);
2086  break;
2087  } else {
2088  /* stream_index check prevents matching picture attachments etc. */
2089  if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
2090  /* audio elementary streams are id3 timestamped */
2092  }
2093 
2094  if (c->first_timestamp == AV_NOPTS_VALUE &&
2095  pls->pkt.dts != AV_NOPTS_VALUE)
2096  c->first_timestamp = av_rescale_q(pls->pkt.dts,
2098  }
2099 
2100  if (pls->seek_timestamp == AV_NOPTS_VALUE)
2101  break;
2102 
2103  if (pls->seek_stream_index < 0 ||
2104  pls->seek_stream_index == pls->pkt.stream_index) {
2105 
2106  if (pls->pkt.dts == AV_NOPTS_VALUE) {
2108  break;
2109  }
2110 
2111  tb = get_timebase(pls);
2112  ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
2113  tb.den, AV_ROUND_DOWN) -
2114  pls->seek_timestamp;
2115  if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
2116  pls->pkt.flags & AV_PKT_FLAG_KEY)) {
2118  break;
2119  }
2120  }
2121  av_packet_unref(&pls->pkt);
2122  }
2123  }
2124  /* Check if this stream has the packet with the lowest dts */
2125  if (pls->pkt.data) {
2126  struct playlist *minpls = minplaylist < 0 ?
2127  NULL : c->playlists[minplaylist];
2128  if (minplaylist < 0) {
2129  minplaylist = i;
2130  } else {
2131  int64_t dts = pls->pkt.dts;
2132  int64_t mindts = minpls->pkt.dts;
2133 
2134  if (dts == AV_NOPTS_VALUE ||
2135  (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
2136  minplaylist = i;
2137  }
2138  }
2139  }
2140 
2141  /* If we got a packet, return it */
2142  if (minplaylist >= 0) {
2143  struct playlist *pls = c->playlists[minplaylist];
2144  AVStream *ist;
2145  AVStream *st;
2146 
2147  ret = update_streams_from_subdemuxer(s, pls);
2148  if (ret < 0) {
2149  av_packet_unref(&pls->pkt);
2150  return ret;
2151  }
2152 
2153  // If sub-demuxer reports updated metadata, copy it to the first stream
2154  // and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
2156  if (pls->n_main_streams) {
2157  st = pls->main_streams[0];
2158  av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
2160  }
2162  }
2163 
2164  /* check if noheader flag has been cleared by the subdemuxer */
2165  if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
2166  pls->has_noheader_flag = 0;
2168  }
2169 
2170  if (pls->pkt.stream_index >= pls->n_main_streams) {
2171  av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
2172  pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
2173  av_packet_unref(&pls->pkt);
2174  return AVERROR_BUG;
2175  }
2176 
2177  ist = pls->ctx->streams[pls->pkt.stream_index];
2178  st = pls->main_streams[pls->pkt.stream_index];
2179 
2180  *pkt = pls->pkt;
2181  pkt->stream_index = st->index;
2182  reset_packet(&c->playlists[minplaylist]->pkt);
2183 
2184  if (pkt->dts != AV_NOPTS_VALUE)
2185  c->cur_timestamp = av_rescale_q(pkt->dts,
2186  ist->time_base,
2187  AV_TIME_BASE_Q);
2188 
2189  /* There may be more situations where this would be useful, but this at least
2190  * handles newly probed codecs properly (i.e. request_probe by mpegts). */
2191  if (ist->codecpar->codec_id != st->codecpar->codec_id) {
2192  ret = set_stream_info_from_input_stream(st, pls, ist);
2193  if (ret < 0) {
2194  av_packet_unref(pkt);
2195  return ret;
2196  }
2197  }
2198 
2199  return 0;
2200  }
2201  return AVERROR_EOF;
2202 }
2203 
2204 static int hls_read_seek(AVFormatContext *s, int stream_index,
2205  int64_t timestamp, int flags)
2206 {
2207  HLSContext *c = s->priv_data;
2208  struct playlist *seek_pls = NULL;
2209  int i, seq_no;
2210  int j;
2211  int stream_subdemuxer_index;
2212  int64_t first_timestamp, seek_timestamp, duration;
2213 
2214  if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
2215  return AVERROR(ENOSYS);
2216 
2217  first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
2218  0 : c->first_timestamp;
2219 
2220  seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
2221  s->streams[stream_index]->time_base.den,
2222  flags & AVSEEK_FLAG_BACKWARD ?
2224 
2225  duration = s->duration == AV_NOPTS_VALUE ?
2226  0 : s->duration;
2227 
2228  if (0 < duration && duration < seek_timestamp - first_timestamp)
2229  return AVERROR(EIO);
2230 
2231  /* find the playlist with the specified stream */
2232  for (i = 0; i < c->n_playlists; i++) {
2233  struct playlist *pls = c->playlists[i];
2234  for (j = 0; j < pls->n_main_streams; j++) {
2235  if (pls->main_streams[j] == s->streams[stream_index]) {
2236  seek_pls = pls;
2237  stream_subdemuxer_index = j;
2238  break;
2239  }
2240  }
2241  }
2242  /* check if the timestamp is valid for the playlist with the
2243  * specified stream index */
2244  if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
2245  return AVERROR(EIO);
2246 
2247  /* set segment now so we do not need to search again below */
2248  seek_pls->cur_seq_no = seq_no;
2249  seek_pls->seek_stream_index = stream_subdemuxer_index;
2250 
2251  for (i = 0; i < c->n_playlists; i++) {
2252  /* Reset reading */
2253  struct playlist *pls = c->playlists[i];
2254  if (pls->input)
2255  ff_format_io_close(pls->parent, &pls->input);
2256  pls->input_read_done = 0;
2257  if (pls->input_next)
2258  ff_format_io_close(pls->parent, &pls->input_next);
2259  pls->input_next_requested = 0;
2260  av_packet_unref(&pls->pkt);
2261  pls->pb.eof_reached = 0;
2262  /* Clear any buffered data */
2263  pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
2264  /* Reset the pos, to let the mpegts demuxer know we've seeked. */
2265  pls->pb.pos = 0;
2266  /* Flush the packet queue of the subdemuxer. */
2267  ff_read_frame_flush(pls->ctx);
2268 
2270  pls->seek_flags = flags;
2271 
2272  if (pls != seek_pls) {
2273  /* set closest segment seq_no for playlists not handled above */
2274  find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
2275  /* seek the playlist to the given position without taking
2276  * keyframes into account since this playlist does not have the
2277  * specified stream where we should look for the keyframes */
2278  pls->seek_stream_index = -1;
2279  pls->seek_flags |= AVSEEK_FLAG_ANY;
2280  }
2281  }
2282 
2284 
2285  return 0;
2286 }
2287 
2288 static int hls_probe(const AVProbeData *p)
2289 {
2290  /* Require #EXTM3U at the start, and either one of the ones below
2291  * somewhere for a proper match. */
2292  if (strncmp(p->buf, "#EXTM3U", 7))
2293  return 0;
2294 
2295  if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
2296  strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
2297  strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
2298  return AVPROBE_SCORE_MAX;
2299  return 0;
2300 }
2301 
2302 #define OFFSET(x) offsetof(HLSContext, x)
2303 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2304 static const AVOption hls_options[] = {
2305  {"live_start_index", "segment index to start live streams at (negative values are from the end)",
2306  OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
2307  {"allowed_extensions", "List of file extensions that hls is allowed to access",
2308  OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2309  {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
2310  INT_MIN, INT_MAX, FLAGS},
2311  {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
2312  OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2313  {"http_persistent", "Use persistent HTTP connections",
2314  OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
2315  {"http_multiple", "Use multiple HTTP connections for fetching segments",
2316  OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
2317  {"http_seekable", "Use HTTP partial requests, 0 = disable, 1 = enable, -1 = auto",
2318  OFFSET(http_seekable), AV_OPT_TYPE_BOOL, { .i64 = -1}, -1, 1, FLAGS},
2319  {NULL}
2320 };
2321 
2322 static const AVClass hls_class = {
2323  .class_name = "hls demuxer",
2324  .item_name = av_default_item_name,
2325  .option = hls_options,
2326  .version = LIBAVUTIL_VERSION_INT,
2327 };
2328 
2330  .name = "hls",
2331  .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
2332  .priv_class = &hls_class,
2333  .priv_data_size = sizeof(HLSContext),
2335  .read_probe = hls_probe,
2338  .read_close = hls_close,
2340 };
#define FF_COMPLIANCE_EXPERIMENTAL
Allow nonstandardized experimental things.
Definition: avcodec.h:2633
#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:1268
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:339
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:967
#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:453
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:1705
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:436
#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:4892
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:456
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:460
static int64_t default_reload_interval(struct playlist *pls)
Definition: hls.c:1325
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
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:674
char language[MAX_FIELD_LEN]
Definition: hls.c:452
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:544
#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:298
int http_seekable
Definition: hls.c:210
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:1010
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:375
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:449
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:455
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:2303
#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:451
int64_t cur_seg_offset
Definition: hls.c:120
char audio[MAX_FIELD_LEN]
Definition: hls.c:324
static void free_rendition_list(HLSContext *c)
Definition: hls.c:285
#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:959
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:5647
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:1081
static struct playlist * new_playlist(HLSContext *c, const char *url, const char *base)
Definition: hls.c:304
AVInputFormat ff_hls_demuxer
Definition: hls.c:2329
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:4465
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:1039
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:4564
static int read_data(void *opaque, uint8_t *buf, int buf_size)
Definition: hls.c:1378
#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:598
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:1550
unsigned int * stream_index
Definition: avformat.h:1279
#define av_log(a,...)
static void free_playlist_list(HLSContext *c)
Definition: hls.c:242
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:650
#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:214
static AVRational get_timebase(struct playlist *pls)
Definition: hls.c:2048
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:211
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2021
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:2056
#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:2322
AVIOInterruptCB * interrupt_callback
Definition: hls.c:204
char bandwidth[20]
Definition: hls.c:322
static void handle_key_args(struct key_info *info, const char *key, int key_len, char **dest, int *dest_len)
Definition: hls.c:379
#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:396
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:224
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:3953
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:1724
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:1582
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:954
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:1669
#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:1526
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:2065
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:373
#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:399
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:329
#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:2023
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:454
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:984
#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:326
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:693
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:616
#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:2304
static int hls_read_header(AVFormatContext *s)
Definition: hls.c:1784
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:1181
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:1749
#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:1647
#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:450
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:1679
#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:4399
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:4864
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:355
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:1041
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:1984
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:4922
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:376
#define OFFSET(x)
Definition: hls.c:2302
char characteristics[MAX_CHARACTERISTICS_LEN]
Definition: hls.c:457
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:374
#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:1332
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3573
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:4437
#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:588
static int hls_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: hls.c:2204
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:2288
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:325
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:395
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:361
#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:231
int64_t duration
Definition: hls.c:69
static void free_variant_list(HLSContext *c)
Definition: hls.c:273
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:828
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:1770
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4843
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:1608
static uint8_t tmp[11]
Definition: aes_ctr.c:26