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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 "libavutil/avstring.h"
30 #include "libavutil/avassert.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/time.h"
36 #include "avformat.h"
37 #include "internal.h"
38 #include "avio_internal.h"
39 #include "url.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 {
65 };
66 
67 struct segment {
68  int64_t duration;
69  int64_t url_offset;
70  int64_t size;
71  char *url;
72  char *key;
74  uint8_t iv[16];
75 };
76 
77 struct rendition;
78 
83 };
84 
85 /*
86  * Each playlist has its own demuxer. If it currently is active,
87  * it has an open AVIOContext too, and potentially an AVPacket
88  * containing the next packet from this stream.
89  */
90 struct playlist {
96  int index;
100 
101  int finished;
106  struct segment **segments;
109  int64_t cur_seg_offset;
110  int64_t last_load_time;
111 
114 
115  /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
116  * (and possibly other ID3 tags) in the beginning of each segment) */
117  int is_id3_timestamped; /* -1: not yet known */
118  int64_t id3_mpegts_timestamp; /* in mpegts tb */
119  int64_t id3_offset; /* in stream original tb */
120  uint8_t* id3_buf; /* temp buffer for id3 parsing */
121  unsigned int id3_buf_size;
122  AVDictionary *id3_initial; /* data from first id3 tag */
123  int id3_found; /* ID3 tag found at some point */
124  int id3_changed; /* ID3 tag data has changed at some point */
125  ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
126 
127  int64_t seek_timestamp;
129  int seek_stream_index; /* into subdemuxer stream array */
130 
131  /* Renditions associated with this playlist, if any.
132  * Alternative rendition playlists have a single rendition associated
133  * with them, and variant main Media Playlists may have
134  * multiple (playlist-less) renditions associated with them. */
137 };
138 
139 /*
140  * Renditions are e.g. alternative subtitle or audio streams.
141  * The rendition may either be an external playlist or it may be
142  * contained in the main Media Playlist of the variant (in which case
143  * playlist is NULL).
144  */
145 struct rendition {
152 };
153 
154 struct variant {
156 
157  /* every variant contains at least the main Media Playlist in index 0 */
159  struct playlist **playlists;
160 
164 };
165 
166 typedef struct HLSContext {
168  struct variant **variants;
170  struct playlist **playlists;
173 
177  int64_t cur_timestamp;
179  char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
180  char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
181  char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context
182 } HLSContext;
183 
184 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
185 {
186  int len = ff_get_line(s, buf, maxlen);
187  while (len > 0 && av_isspace(buf[len - 1]))
188  buf[--len] = '\0';
189  return len;
190 }
191 
192 static void free_segment_list(struct playlist *pls)
193 {
194  int i;
195  for (i = 0; i < pls->n_segments; i++) {
196  av_freep(&pls->segments[i]->key);
197  av_freep(&pls->segments[i]->url);
198  av_freep(&pls->segments[i]);
199  }
200  av_freep(&pls->segments);
201  pls->n_segments = 0;
202 }
203 
205 {
206  int i;
207  for (i = 0; i < c->n_playlists; i++) {
208  struct playlist *pls = c->playlists[i];
209  free_segment_list(pls);
210  av_freep(&pls->renditions);
211  av_freep(&pls->id3_buf);
212  av_dict_free(&pls->id3_initial);
214  av_free_packet(&pls->pkt);
215  av_freep(&pls->pb.buffer);
216  if (pls->input)
217  ffurl_close(pls->input);
218  if (pls->ctx) {
219  pls->ctx->pb = NULL;
220  avformat_close_input(&pls->ctx);
221  }
222  av_free(pls);
223  }
224  av_freep(&c->playlists);
225  av_freep(&c->cookies);
226  av_freep(&c->user_agent);
227  c->n_playlists = 0;
228 }
229 
231 {
232  int i;
233  for (i = 0; i < c->n_variants; i++) {
234  struct variant *var = c->variants[i];
235  av_freep(&var->playlists);
236  av_free(var);
237  }
238  av_freep(&c->variants);
239  c->n_variants = 0;
240 }
241 
243 {
244  int i;
245  for (i = 0; i < c->n_renditions; i++)
246  av_freep(&c->renditions[i]);
247  av_freep(&c->renditions);
248  c->n_renditions = 0;
249 }
250 
251 /*
252  * Used to reset a statically allocated AVPacket to a clean slate,
253  * containing no data.
254  */
255 static void reset_packet(AVPacket *pkt)
256 {
257  av_init_packet(pkt);
258  pkt->data = NULL;
259 }
260 
261 static struct playlist *new_playlist(HLSContext *c, const char *url,
262  const char *base)
263 {
264  struct playlist *pls = av_mallocz(sizeof(struct playlist));
265  if (!pls)
266  return NULL;
267  reset_packet(&pls->pkt);
268  ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
270 
271  pls->is_id3_timestamped = -1;
273 
274  dynarray_add(&c->playlists, &c->n_playlists, pls);
275  return pls;
276 }
277 
278 struct variant_info {
279  char bandwidth[20];
280  /* variant group ids: */
284 };
285 
286 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
287  const char *url, const char *base)
288 {
289  struct variant *var;
290  struct playlist *pls;
291 
292  pls = new_playlist(c, url, base);
293  if (!pls)
294  return NULL;
295 
296  var = av_mallocz(sizeof(struct variant));
297  if (!var)
298  return NULL;
299 
300  if (info) {
301  var->bandwidth = atoi(info->bandwidth);
302  strcpy(var->audio_group, info->audio);
303  strcpy(var->video_group, info->video);
304  strcpy(var->subtitles_group, info->subtitles);
305  }
306 
307  dynarray_add(&c->variants, &c->n_variants, var);
308  dynarray_add(&var->playlists, &var->n_playlists, pls);
309  return var;
310 }
311 
312 static void handle_variant_args(struct variant_info *info, const char *key,
313  int key_len, char **dest, int *dest_len)
314 {
315  if (!strncmp(key, "BANDWIDTH=", key_len)) {
316  *dest = info->bandwidth;
317  *dest_len = sizeof(info->bandwidth);
318  } else if (!strncmp(key, "AUDIO=", key_len)) {
319  *dest = info->audio;
320  *dest_len = sizeof(info->audio);
321  } else if (!strncmp(key, "VIDEO=", key_len)) {
322  *dest = info->video;
323  *dest_len = sizeof(info->video);
324  } else if (!strncmp(key, "SUBTITLES=", key_len)) {
325  *dest = info->subtitles;
326  *dest_len = sizeof(info->subtitles);
327  }
328 }
329 
330 struct key_info {
332  char method[10];
333  char iv[35];
334 };
335 
336 static void handle_key_args(struct key_info *info, const char *key,
337  int key_len, char **dest, int *dest_len)
338 {
339  if (!strncmp(key, "METHOD=", key_len)) {
340  *dest = info->method;
341  *dest_len = sizeof(info->method);
342  } else if (!strncmp(key, "URI=", key_len)) {
343  *dest = info->uri;
344  *dest_len = sizeof(info->uri);
345  } else if (!strncmp(key, "IV=", key_len)) {
346  *dest = info->iv;
347  *dest_len = sizeof(info->iv);
348  }
349 }
350 
352  char type[16];
358  char defaultr[4];
359  char forced[4];
361 };
362 
363 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
364  const char *url_base)
365 {
366  struct rendition *rend;
368  char *characteristic;
369  char *chr_ptr;
370  char *saveptr;
371 
372  if (!strcmp(info->type, "AUDIO"))
373  type = AVMEDIA_TYPE_AUDIO;
374  else if (!strcmp(info->type, "VIDEO"))
375  type = AVMEDIA_TYPE_VIDEO;
376  else if (!strcmp(info->type, "SUBTITLES"))
377  type = AVMEDIA_TYPE_SUBTITLE;
378  else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
379  /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
380  * AVC SEI RBSP anyway */
381  return NULL;
382 
383  if (type == AVMEDIA_TYPE_UNKNOWN)
384  return NULL;
385 
386  /* URI is mandatory for subtitles as per spec */
387  if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
388  return NULL;
389 
390  /* TODO: handle subtitles (each segment has to parsed separately) */
391  if (type == AVMEDIA_TYPE_SUBTITLE)
392  return NULL;
393 
394  rend = av_mallocz(sizeof(struct rendition));
395  if (!rend)
396  return NULL;
397 
398  dynarray_add(&c->renditions, &c->n_renditions, rend);
399 
400  rend->type = type;
401  strcpy(rend->group_id, info->group_id);
402  strcpy(rend->language, info->language);
403  strcpy(rend->name, info->name);
404 
405  /* add the playlist if this is an external rendition */
406  if (info->uri[0]) {
407  rend->playlist = new_playlist(c, info->uri, url_base);
408  if (rend->playlist)
410  &rend->playlist->n_renditions, rend);
411  }
412 
413  if (info->assoc_language[0]) {
414  int langlen = strlen(rend->language);
415  if (langlen < sizeof(rend->language) - 3) {
416  rend->language[langlen] = ',';
417  strncpy(rend->language + langlen + 1, info->assoc_language,
418  sizeof(rend->language) - langlen - 2);
419  }
420  }
421 
422  if (!strcmp(info->defaultr, "YES"))
424  if (!strcmp(info->forced, "YES"))
426 
427  chr_ptr = info->characteristics;
428  while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
429  if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
431  else if (!strcmp(characteristic, "public.accessibility.describes-video"))
433 
434  chr_ptr = NULL;
435  }
436 
437  return rend;
438 }
439 
440 static void handle_rendition_args(struct rendition_info *info, const char *key,
441  int key_len, char **dest, int *dest_len)
442 {
443  if (!strncmp(key, "TYPE=", key_len)) {
444  *dest = info->type;
445  *dest_len = sizeof(info->type);
446  } else if (!strncmp(key, "URI=", key_len)) {
447  *dest = info->uri;
448  *dest_len = sizeof(info->uri);
449  } else if (!strncmp(key, "GROUP-ID=", key_len)) {
450  *dest = info->group_id;
451  *dest_len = sizeof(info->group_id);
452  } else if (!strncmp(key, "LANGUAGE=", key_len)) {
453  *dest = info->language;
454  *dest_len = sizeof(info->language);
455  } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
456  *dest = info->assoc_language;
457  *dest_len = sizeof(info->assoc_language);
458  } else if (!strncmp(key, "NAME=", key_len)) {
459  *dest = info->name;
460  *dest_len = sizeof(info->name);
461  } else if (!strncmp(key, "DEFAULT=", key_len)) {
462  *dest = info->defaultr;
463  *dest_len = sizeof(info->defaultr);
464  } else if (!strncmp(key, "FORCED=", key_len)) {
465  *dest = info->forced;
466  *dest_len = sizeof(info->forced);
467  } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
468  *dest = info->characteristics;
469  *dest_len = sizeof(info->characteristics);
470  }
471  /*
472  * ignored:
473  * - AUTOSELECT: client may autoselect based on e.g. system language
474  * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
475  */
476 }
477 
478 /* used by parse_playlist to allocate a new variant+playlist when the
479  * playlist is detected to be a Media Playlist (not Master Playlist)
480  * and we have no parent Master Playlist (parsing of which would have
481  * allocated the variant and playlist already) */
482 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
483 {
484  if (*pls)
485  return 0;
486  if (!new_variant(c, NULL, url, NULL))
487  return AVERROR(ENOMEM);
488  *pls = c->playlists[c->n_playlists - 1];
489  return 0;
490 }
491 
492 /* pls = NULL => Master Playlist or parentless Media Playlist
493  * pls = !NULL => parented Media Playlist, playlist+variant allocated */
494 static int parse_playlist(HLSContext *c, const char *url,
495  struct playlist *pls, AVIOContext *in)
496 {
497  int ret = 0, is_segment = 0, is_variant = 0;
498  int64_t duration = 0;
499  enum KeyType key_type = KEY_NONE;
500  uint8_t iv[16] = "";
501  int has_iv = 0;
502  char key[MAX_URL_SIZE] = "";
503  char line[MAX_URL_SIZE];
504  const char *ptr;
505  int close_in = 0;
506  int64_t seg_offset = 0;
507  int64_t seg_size = -1;
508  uint8_t *new_url = NULL;
509  struct variant_info variant_info;
510  char tmp_str[MAX_URL_SIZE];
511 
512  if (!in) {
513  AVDictionary *opts = NULL;
514  close_in = 1;
515  /* Some HLS servers don't like being sent the range header */
516  av_dict_set(&opts, "seekable", "0", 0);
517 
518  // broker prior HTTP options that should be consistent across requests
519  av_dict_set(&opts, "user-agent", c->user_agent, 0);
520  av_dict_set(&opts, "cookies", c->cookies, 0);
521  av_dict_set(&opts, "headers", c->headers, 0);
522 
523  ret = avio_open2(&in, url, AVIO_FLAG_READ,
524  c->interrupt_callback, &opts);
525  av_dict_free(&opts);
526  if (ret < 0)
527  return ret;
528  }
529 
530  if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
531  url = new_url;
532 
533  read_chomp_line(in, line, sizeof(line));
534  if (strcmp(line, "#EXTM3U")) {
535  ret = AVERROR_INVALIDDATA;
536  goto fail;
537  }
538 
539  if (pls) {
540  free_segment_list(pls);
541  pls->finished = 0;
542  pls->type = PLS_TYPE_UNSPECIFIED;
543  }
544  while (!avio_feof(in)) {
545  read_chomp_line(in, line, sizeof(line));
546  if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
547  is_variant = 1;
548  memset(&variant_info, 0, sizeof(variant_info));
550  &variant_info);
551  } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
552  struct key_info info = {{0}};
554  &info);
555  key_type = KEY_NONE;
556  has_iv = 0;
557  if (!strcmp(info.method, "AES-128"))
558  key_type = KEY_AES_128;
559  if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
560  ff_hex_to_data(iv, info.iv + 2);
561  has_iv = 1;
562  }
563  av_strlcpy(key, info.uri, sizeof(key));
564  } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
565  struct rendition_info info = {{0}};
567  &info);
568  new_rendition(c, &info, url);
569  } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
570  ret = ensure_playlist(c, &pls, url);
571  if (ret < 0)
572  goto fail;
573  pls->target_duration = atoi(ptr) * AV_TIME_BASE;
574  } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
575  ret = ensure_playlist(c, &pls, url);
576  if (ret < 0)
577  goto fail;
578  pls->start_seq_no = atoi(ptr);
579  } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
580  ret = ensure_playlist(c, &pls, url);
581  if (ret < 0)
582  goto fail;
583  if (!strcmp(ptr, "EVENT"))
584  pls->type = PLS_TYPE_EVENT;
585  else if (!strcmp(ptr, "VOD"))
586  pls->type = PLS_TYPE_VOD;
587  } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
588  if (pls)
589  pls->finished = 1;
590  } else if (av_strstart(line, "#EXTINF:", &ptr)) {
591  is_segment = 1;
592  duration = atof(ptr) * AV_TIME_BASE;
593  } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
594  seg_size = atoi(ptr);
595  ptr = strchr(ptr, '@');
596  if (ptr)
597  seg_offset = atoi(ptr+1);
598  } else if (av_strstart(line, "#", NULL)) {
599  continue;
600  } else if (line[0]) {
601  if (is_variant) {
602  if (!new_variant(c, &variant_info, line, url)) {
603  ret = AVERROR(ENOMEM);
604  goto fail;
605  }
606  is_variant = 0;
607  }
608  if (is_segment) {
609  struct segment *seg;
610  if (!pls) {
611  if (!new_variant(c, 0, url, NULL)) {
612  ret = AVERROR(ENOMEM);
613  goto fail;
614  }
615  pls = c->playlists[c->n_playlists - 1];
616  }
617  seg = av_malloc(sizeof(struct segment));
618  if (!seg) {
619  ret = AVERROR(ENOMEM);
620  goto fail;
621  }
622  seg->duration = duration;
623  seg->key_type = key_type;
624  if (has_iv) {
625  memcpy(seg->iv, iv, sizeof(iv));
626  } else {
627  int seq = pls->start_seq_no + pls->n_segments;
628  memset(seg->iv, 0, sizeof(seg->iv));
629  AV_WB32(seg->iv + 12, seq);
630  }
631 
632  if (key_type != KEY_NONE) {
633  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
634  seg->key = av_strdup(tmp_str);
635  if (!seg->key) {
636  av_free(seg);
637  ret = AVERROR(ENOMEM);
638  goto fail;
639  }
640  } else {
641  seg->key = NULL;
642  }
643 
644  ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
645  seg->url = av_strdup(tmp_str);
646  if (!seg->url) {
647  av_free(seg->key);
648  av_free(seg);
649  ret = AVERROR(ENOMEM);
650  goto fail;
651  }
652 
653  dynarray_add(&pls->segments, &pls->n_segments, seg);
654  is_segment = 0;
655 
656  seg->size = seg_size;
657  if (seg_size >= 0) {
658  seg->url_offset = seg_offset;
659  seg_offset += seg_size;
660  seg_size = -1;
661  } else {
662  seg->url_offset = 0;
663  seg_offset = 0;
664  }
665  }
666  }
667  }
668  if (pls)
669  pls->last_load_time = av_gettime();
670 
671 fail:
672  av_free(new_url);
673  if (close_in)
674  avio_close(in);
675  return ret;
676 }
677 
681 };
682 
683 /* read from URLContext, limiting read to current segment */
684 static int read_from_url(struct playlist *pls, uint8_t *buf, int buf_size,
685  enum ReadFromURLMode mode)
686 {
687  int ret;
688  struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
689 
690  /* limit read if the segment was only a part of a file */
691  if (seg->size >= 0)
692  buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
693 
694  if (mode == READ_COMPLETE)
695  ret = ffurl_read_complete(pls->input, buf, buf_size);
696  else
697  ret = ffurl_read(pls->input, buf, buf_size);
698 
699  if (ret > 0)
700  pls->cur_seg_offset += ret;
701 
702  return ret;
703 }
704 
705 /* Parse the raw ID3 data and pass contents to caller */
707  AVDictionary **metadata, int64_t *dts,
708  ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
709 {
710  static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
711  ID3v2ExtraMeta *meta;
712 
713  ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
714  for (meta = *extra_meta; meta; meta = meta->next) {
715  if (!strcmp(meta->tag, "PRIV")) {
716  ID3v2ExtraMetaPRIV *priv = meta->data;
717  if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
718  /* 33-bit MPEG timestamp */
719  int64_t ts = AV_RB64(priv->data);
720  av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
721  if ((ts & ~((1ULL << 33) - 1)) == 0)
722  *dts = ts;
723  else
724  av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
725  }
726  } else if (!strcmp(meta->tag, "APIC") && apic)
727  *apic = meta->data;
728  }
729 }
730 
731 /* Check if the ID3 metadata contents have changed */
732 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
733  ID3v2ExtraMetaAPIC *apic)
734 {
735  AVDictionaryEntry *entry = NULL;
736  AVDictionaryEntry *oldentry;
737  /* check that no keys have changed values */
738  while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
739  oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
740  if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
741  return 1;
742  }
743 
744  /* check if apic appeared */
745  if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
746  return 1;
747 
748  if (apic) {
749  int size = pls->ctx->streams[1]->attached_pic.size;
750  if (size != apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE)
751  return 1;
752 
753  if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
754  return 1;
755  }
756 
757  return 0;
758 }
759 
760 /* Parse ID3 data and handle the found data */
761 static void handle_id3(AVIOContext *pb, struct playlist *pls)
762 {
763  AVDictionary *metadata = NULL;
764  ID3v2ExtraMetaAPIC *apic = NULL;
765  ID3v2ExtraMeta *extra_meta = NULL;
766  int64_t timestamp = AV_NOPTS_VALUE;
767 
768  parse_id3(pls->ctx, pb, &metadata, &timestamp, &apic, &extra_meta);
769 
770  if (timestamp != AV_NOPTS_VALUE) {
771  pls->id3_mpegts_timestamp = timestamp;
772  pls->id3_offset = 0;
773  }
774 
775  if (!pls->id3_found) {
776  /* initial ID3 tags */
778  pls->id3_found = 1;
779 
780  /* get picture attachment and set text metadata */
781  if (pls->ctx->nb_streams)
782  ff_id3v2_parse_apic(pls->ctx, &extra_meta);
783  else
784  /* demuxer not yet opened, defer picture attachment */
785  pls->id3_deferred_extra = extra_meta;
786 
787  av_dict_copy(&pls->ctx->metadata, metadata, 0);
788  pls->id3_initial = metadata;
789 
790  } else {
791  if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
792  avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
793  pls->id3_changed = 1;
794  }
795  av_dict_free(&metadata);
796  }
797 
798  if (!pls->id3_deferred_extra)
799  ff_id3v2_free_extra_meta(&extra_meta);
800 }
801 
802 /* Intercept and handle ID3 tags between URLContext and AVIOContext */
803 static void intercept_id3(struct playlist *pls, uint8_t *buf,
804  int buf_size, int *len)
805 {
806  /* intercept id3 tags, we do not want to pass them to the raw
807  * demuxer on all segment switches */
808  int bytes;
809  int id3_buf_pos = 0;
810  int fill_buf = 0;
811 
812  /* gather all the id3 tags */
813  while (1) {
814  /* see if we can retrieve enough data for ID3 header */
815  if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
816  bytes = read_from_url(pls, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE);
817  if (bytes > 0) {
818 
819  if (bytes == ID3v2_HEADER_SIZE - *len)
820  /* no EOF yet, so fill the caller buffer again after
821  * we have stripped the ID3 tags */
822  fill_buf = 1;
823 
824  *len += bytes;
825 
826  } else if (*len <= 0) {
827  /* error/EOF */
828  *len = bytes;
829  fill_buf = 0;
830  }
831  }
832 
833  if (*len < ID3v2_HEADER_SIZE)
834  break;
835 
837  struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
838  int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
839  int taglen = ff_id3v2_tag_len(buf);
840  int tag_got_bytes = FFMIN(taglen, *len);
841  int remaining = taglen - tag_got_bytes;
842 
843  if (taglen > maxsize) {
844  av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
845  taglen, maxsize);
846  break;
847  }
848 
849  /*
850  * Copy the id3 tag to our temporary id3 buffer.
851  * We could read a small id3 tag directly without memcpy, but
852  * we would still need to copy the large tags, and handling
853  * both of those cases together with the possibility for multiple
854  * tags would make the handling a bit complex.
855  */
856  pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
857  if (!pls->id3_buf)
858  break;
859  memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
860  id3_buf_pos += tag_got_bytes;
861 
862  /* strip the intercepted bytes */
863  *len -= tag_got_bytes;
864  memmove(buf, buf + tag_got_bytes, *len);
865  av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
866 
867  if (remaining > 0) {
868  /* read the rest of the tag in */
869  if (read_from_url(pls, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
870  break;
871  id3_buf_pos += remaining;
872  av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
873  }
874 
875  } else {
876  /* no more ID3 tags */
877  break;
878  }
879  }
880 
881  /* re-fill buffer for the caller unless EOF */
882  if (*len >= 0 && (fill_buf || *len == 0)) {
883  bytes = read_from_url(pls, buf + *len, buf_size - *len, READ_NORMAL);
884 
885  /* ignore error if we already had some data */
886  if (bytes >= 0)
887  *len += bytes;
888  else if (*len == 0)
889  *len = bytes;
890  }
891 
892  if (pls->id3_buf) {
893  /* Now parse all the ID3 tags */
894  AVIOContext id3ioctx;
895  ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
896  handle_id3(&id3ioctx, pls);
897  }
898 
899  if (pls->is_id3_timestamped == -1)
901 }
902 
903 static int open_input(HLSContext *c, struct playlist *pls)
904 {
905  AVDictionary *opts = NULL;
906  AVDictionary *opts2 = NULL;
907  int ret;
908  struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
909 
910  // broker prior HTTP options that should be consistent across requests
911  av_dict_set(&opts, "user-agent", c->user_agent, 0);
912  av_dict_set(&opts, "cookies", c->cookies, 0);
913  av_dict_set(&opts, "headers", c->headers, 0);
914  av_dict_set(&opts, "seekable", "0", 0);
915 
916  // Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice)
917  av_dict_copy(&opts2, opts, 0);
918 
919  if (seg->size >= 0) {
920  /* try to restrict the HTTP request to the part we want
921  * (if this is in fact a HTTP request) */
922  av_dict_set_int(&opts, "offset", seg->url_offset, 0);
923  av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
924  }
925 
926  av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
927  seg->url, seg->url_offset, pls->index);
928 
929  if (seg->key_type == KEY_NONE) {
930  ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ,
931  &pls->parent->interrupt_callback, &opts);
932 
933  } else if (seg->key_type == KEY_AES_128) {
934  char iv[33], key[33], url[MAX_URL_SIZE];
935  if (strcmp(seg->key, pls->key_url)) {
936  URLContext *uc;
937  if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
938  &pls->parent->interrupt_callback, &opts2) == 0) {
939  if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
940  != sizeof(pls->key)) {
941  av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
942  seg->key);
943  }
944  ffurl_close(uc);
945  } else {
946  av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
947  seg->key);
948  }
949  av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
950  }
951  ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
952  ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
953  iv[32] = key[32] = '\0';
954  if (strstr(seg->url, "://"))
955  snprintf(url, sizeof(url), "crypto+%s", seg->url);
956  else
957  snprintf(url, sizeof(url), "crypto:%s", seg->url);
958  if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ,
959  &pls->parent->interrupt_callback)) < 0)
960  goto cleanup;
961  av_opt_set(pls->input->priv_data, "key", key, 0);
962  av_opt_set(pls->input->priv_data, "iv", iv, 0);
963 
964  if ((ret = ffurl_connect(pls->input, &opts)) < 0) {
965  ffurl_close(pls->input);
966  pls->input = NULL;
967  goto cleanup;
968  }
969  ret = 0;
970  }
971  else
972  ret = AVERROR(ENOSYS);
973 
974  /* Seek to the requested position. If this was a HTTP request, the offset
975  * should already be where want it to, but this allows e.g. local testing
976  * without a HTTP server. */
977  if (ret == 0 && seg->key_type == KEY_NONE) {
978  int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET);
979  if (seekret < 0) {
980  av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
981  ret = seekret;
982  ffurl_close(pls->input);
983  pls->input = NULL;
984  }
985  }
986 
987 cleanup:
988  av_dict_free(&opts);
989  av_dict_free(&opts2);
990  pls->cur_seg_offset = 0;
991  return ret;
992 }
993 
994 static int64_t default_reload_interval(struct playlist *pls)
995 {
996  return pls->n_segments > 0 ?
997  pls->segments[pls->n_segments - 1]->duration :
998  pls->target_duration;
999 }
1000 
1001 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1002 {
1003  struct playlist *v = opaque;
1004  HLSContext *c = v->parent->priv_data;
1005  int ret, i;
1006  int just_opened = 0;
1007 
1008 restart:
1009  if (!v->needed)
1010  return AVERROR_EOF;
1011 
1012  if (!v->input) {
1013  int64_t reload_interval;
1014 
1015  /* Check that the playlist is still needed before opening a new
1016  * segment. */
1017  if (v->ctx && v->ctx->nb_streams &&
1018  v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
1019  v->needed = 0;
1020  for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
1021  i++) {
1022  if (v->parent->streams[i]->discard < AVDISCARD_ALL)
1023  v->needed = 1;
1024  }
1025  }
1026  if (!v->needed) {
1027  av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
1028  v->index);
1029  return AVERROR_EOF;
1030  }
1031 
1032  /* If this is a live stream and the reload interval has elapsed since
1033  * the last playlist reload, reload the playlists now. */
1034  reload_interval = default_reload_interval(v);
1035 
1036 reload:
1037  if (!v->finished &&
1038  av_gettime() - v->last_load_time >= reload_interval) {
1039  if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1040  av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1041  v->index);
1042  return ret;
1043  }
1044  /* If we need to reload the playlist again below (if
1045  * there's still no more segments), switch to a reload
1046  * interval of half the target duration. */
1047  reload_interval = v->target_duration / 2;
1048  }
1049  if (v->cur_seq_no < v->start_seq_no) {
1050  av_log(NULL, AV_LOG_WARNING,
1051  "skipping %d segments ahead, expired from playlists\n",
1052  v->start_seq_no - v->cur_seq_no);
1053  v->cur_seq_no = v->start_seq_no;
1054  }
1055  if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1056  if (v->finished)
1057  return AVERROR_EOF;
1058  while (av_gettime() - v->last_load_time < reload_interval) {
1060  return AVERROR_EXIT;
1061  av_usleep(100*1000);
1062  }
1063  /* Enough time has elapsed since the last reload */
1064  goto reload;
1065  }
1066 
1067  ret = open_input(c, v);
1068  if (ret < 0) {
1069  av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
1070  v->index);
1071  return ret;
1072  }
1073  just_opened = 1;
1074  }
1075 
1076  ret = read_from_url(v, buf, buf_size, READ_NORMAL);
1077  if (ret > 0) {
1078  if (just_opened && v->is_id3_timestamped != 0) {
1079  /* Intercept ID3 tags here, elementary audio streams are required
1080  * to convey timestamps using them in the beginning of each segment. */
1081  intercept_id3(v, buf, buf_size, &ret);
1082  }
1083 
1084  return ret;
1085  }
1086  ffurl_close(v->input);
1087  v->input = NULL;
1088  v->cur_seq_no++;
1089 
1090  c->cur_seq_no = v->cur_seq_no;
1091 
1092  goto restart;
1093 }
1094 
1096 {
1097  int variant_count = 0;
1098  int i, j;
1099 
1100  for (i = 0; i < c->n_variants && variant_count < 2; i++) {
1101  struct variant *v = c->variants[i];
1102 
1103  for (j = 0; j < v->n_playlists; j++) {
1104  if (v->playlists[j] == pls) {
1105  variant_count++;
1106  break;
1107  }
1108  }
1109  }
1110 
1111  return variant_count >= 2;
1112 }
1113 
1114 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1115  enum AVMediaType type, const char *group_id)
1116 {
1117  int i;
1118 
1119  for (i = 0; i < c->n_renditions; i++) {
1120  struct rendition *rend = c->renditions[i];
1121 
1122  if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1123 
1124  if (rend->playlist)
1125  /* rendition is an external playlist
1126  * => add the playlist to the variant */
1127  dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1128  else
1129  /* rendition is part of the variant main Media Playlist
1130  * => add the rendition to the main Media Playlist */
1131  dynarray_add(&var->playlists[0]->renditions,
1132  &var->playlists[0]->n_renditions,
1133  rend);
1134  }
1135  }
1136 }
1137 
1139  enum AVMediaType type)
1140 {
1141  int rend_idx = 0;
1142  int i;
1143 
1144  for (i = 0; i < pls->ctx->nb_streams; i++) {
1145  AVStream *st = s->streams[pls->stream_offset + i];
1146 
1147  if (st->codec->codec_type != type)
1148  continue;
1149 
1150  for (; rend_idx < pls->n_renditions; rend_idx++) {
1151  struct rendition *rend = pls->renditions[rend_idx];
1152 
1153  if (rend->type != type)
1154  continue;
1155 
1156  if (rend->language[0])
1157  av_dict_set(&st->metadata, "language", rend->language, 0);
1158  if (rend->name[0])
1159  av_dict_set(&st->metadata, "comment", rend->name, 0);
1160 
1161  st->disposition |= rend->disposition;
1162  }
1163  if (rend_idx >=pls->n_renditions)
1164  break;
1165  }
1166 }
1167 
1168 /* if timestamp was in valid range: returns 1 and sets seq_no
1169  * if not: returns 0 and sets seq_no to closest segment */
1171  int64_t timestamp, int *seq_no)
1172 {
1173  int i;
1174  int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1175  0 : c->first_timestamp;
1176 
1177  if (timestamp < pos) {
1178  *seq_no = pls->start_seq_no;
1179  return 0;
1180  }
1181 
1182  for (i = 0; i < pls->n_segments; i++) {
1183  int64_t diff = pos + pls->segments[i]->duration - timestamp;
1184  if (diff > 0) {
1185  *seq_no = pls->start_seq_no + i;
1186  return 1;
1187  }
1188  pos += pls->segments[i]->duration;
1189  }
1190 
1191  *seq_no = pls->start_seq_no + pls->n_segments - 1;
1192 
1193  return 0;
1194 }
1195 
1196 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1197 {
1198  int seq_no;
1199 
1200  if (!pls->finished && !c->first_packet &&
1202  /* reload the playlist since it was suspended */
1203  parse_playlist(c, pls->url, pls, NULL);
1204 
1205  /* If playback is already in progress (we are just selecting a new
1206  * playlist) and this is a complete file, find the matching segment
1207  * by counting durations. */
1208  if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1209  find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1210  return seq_no;
1211  }
1212 
1213  if (!pls->finished) {
1214  if (!c->first_packet && /* we are doing a segment selection during playback */
1215  c->cur_seq_no >= pls->start_seq_no &&
1216  c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1217  /* While spec 3.4.3 says that we cannot assume anything about the
1218  * content at the same sequence number on different playlists,
1219  * in practice this seems to work and doing it otherwise would
1220  * require us to download a segment to inspect its timestamps. */
1221  return c->cur_seq_no;
1222 
1223  /* If this is a live stream with more than 3 segments, start at the
1224  * third last segment. */
1225  if (pls->n_segments > 3)
1226  return pls->start_seq_no + pls->n_segments - 3;
1227  }
1228 
1229  /* Otherwise just start on the first segment. */
1230  return pls->start_seq_no;
1231 }
1232 
1234 {
1235  URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
1236  HLSContext *c = s->priv_data;
1237  int ret = 0, i, j, stream_offset = 0;
1238 
1239  c->interrupt_callback = &s->interrupt_callback;
1240 
1241  c->first_packet = 1;
1242  c->first_timestamp = AV_NOPTS_VALUE;
1243  c->cur_timestamp = AV_NOPTS_VALUE;
1244 
1245  // if the URL context is good, read important options we must broker later
1246  if (u && u->prot->priv_data_class) {
1247  // get the previous user agent & set back to null if string size is zero
1248  av_freep(&c->user_agent);
1249  av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent));
1250  if (c->user_agent && !strlen(c->user_agent))
1251  av_freep(&c->user_agent);
1252 
1253  // get the previous cookies & set back to null if string size is zero
1254  av_freep(&c->cookies);
1255  av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies));
1256  if (c->cookies && !strlen(c->cookies))
1257  av_freep(&c->cookies);
1258 
1259  // get the previous headers & set back to null if string size is zero
1260  av_freep(&c->headers);
1261  av_opt_get(u->priv_data, "headers", 0, (uint8_t**)&(c->headers));
1262  if (c->headers && !strlen(c->headers))
1263  av_freep(&c->headers);
1264  }
1265 
1266  if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
1267  goto fail;
1268 
1269  if (c->n_variants == 0) {
1270  av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1271  ret = AVERROR_EOF;
1272  goto fail;
1273  }
1274  /* If the playlist only contained playlists (Master Playlist),
1275  * parse each individual playlist. */
1276  if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1277  for (i = 0; i < c->n_playlists; i++) {
1278  struct playlist *pls = c->playlists[i];
1279  if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
1280  goto fail;
1281  }
1282  }
1283 
1284  if (c->variants[0]->playlists[0]->n_segments == 0) {
1285  av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1286  ret = AVERROR_EOF;
1287  goto fail;
1288  }
1289 
1290  /* If this isn't a live stream, calculate the total duration of the
1291  * stream. */
1292  if (c->variants[0]->playlists[0]->finished) {
1293  int64_t duration = 0;
1294  for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1295  duration += c->variants[0]->playlists[0]->segments[i]->duration;
1296  s->duration = duration;
1297  }
1298 
1299  /* Associate renditions with variants */
1300  for (i = 0; i < c->n_variants; i++) {
1301  struct variant *var = c->variants[i];
1302 
1303  if (var->audio_group[0])
1305  if (var->video_group[0])
1307  if (var->subtitles_group[0])
1309  }
1310 
1311  /* Open the demuxer for each playlist */
1312  for (i = 0; i < c->n_playlists; i++) {
1313  struct playlist *pls = c->playlists[i];
1314  AVInputFormat *in_fmt = NULL;
1315 
1316  if (pls->n_segments == 0)
1317  continue;
1318 
1319  if (!(pls->ctx = avformat_alloc_context())) {
1320  ret = AVERROR(ENOMEM);
1321  goto fail;
1322  }
1323 
1324  pls->index = i;
1325  pls->needed = 1;
1326  pls->parent = s;
1327  pls->cur_seq_no = select_cur_seq_no(c, pls);
1328 
1330  ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1331  read_data, NULL, NULL);
1332  pls->pb.seekable = 0;
1333  ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1334  NULL, 0, 0);
1335  if (ret < 0) {
1336  /* Free the ctx - it isn't initialized properly at this point,
1337  * so avformat_close_input shouldn't be called. If
1338  * avformat_open_input fails below, it frees and zeros the
1339  * context, so it doesn't need any special treatment like this. */
1340  av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1341  avformat_free_context(pls->ctx);
1342  pls->ctx = NULL;
1343  goto fail;
1344  }
1345  pls->ctx->pb = &pls->pb;
1347  ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1348  if (ret < 0)
1349  goto fail;
1350 
1351  if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1355  pls->id3_deferred_extra = NULL;
1356  }
1357 
1358  pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
1359  ret = avformat_find_stream_info(pls->ctx, NULL);
1360  if (ret < 0)
1361  goto fail;
1362 
1363  if (pls->is_id3_timestamped == -1)
1364  av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1365 
1366  /* Create new AVStreams for each stream in this playlist */
1367  for (j = 0; j < pls->ctx->nb_streams; j++) {
1368  AVStream *st = avformat_new_stream(s, NULL);
1369  AVStream *ist = pls->ctx->streams[j];
1370  if (!st) {
1371  ret = AVERROR(ENOMEM);
1372  goto fail;
1373  }
1374  st->id = i;
1375 
1376  avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
1377 
1378  if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1379  avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1380  else
1382  }
1383 
1387 
1388  stream_offset += pls->ctx->nb_streams;
1389  }
1390 
1391  /* Create a program for each variant */
1392  for (i = 0; i < c->n_variants; i++) {
1393  struct variant *v = c->variants[i];
1394  AVProgram *program;
1395 
1396  program = av_new_program(s, i);
1397  if (!program)
1398  goto fail;
1399  av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1400 
1401  for (j = 0; j < v->n_playlists; j++) {
1402  struct playlist *pls = v->playlists[j];
1403  int is_shared = playlist_in_multiple_variants(c, pls);
1404  int k;
1405 
1406  for (k = 0; k < pls->ctx->nb_streams; k++) {
1407  struct AVStream *st = s->streams[pls->stream_offset + k];
1408 
1410 
1411  /* Set variant_bitrate for streams unique to this variant */
1412  if (!is_shared && v->bandwidth)
1413  av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0);
1414  }
1415  }
1416  }
1417 
1418  return 0;
1419 fail:
1423  return ret;
1424 }
1425 
1426 static int recheck_discard_flags(AVFormatContext *s, int first)
1427 {
1428  HLSContext *c = s->priv_data;
1429  int i, changed = 0;
1430 
1431  /* Check if any new streams are needed */
1432  for (i = 0; i < c->n_playlists; i++)
1433  c->playlists[i]->cur_needed = 0;
1434 
1435  for (i = 0; i < s->nb_streams; i++) {
1436  AVStream *st = s->streams[i];
1437  struct playlist *pls = c->playlists[s->streams[i]->id];
1438  if (st->discard < AVDISCARD_ALL)
1439  pls->cur_needed = 1;
1440  }
1441  for (i = 0; i < c->n_playlists; i++) {
1442  struct playlist *pls = c->playlists[i];
1443  if (pls->cur_needed && !pls->needed) {
1444  pls->needed = 1;
1445  changed = 1;
1446  pls->cur_seq_no = select_cur_seq_no(c, pls);
1447  pls->pb.eof_reached = 0;
1448  if (c->cur_timestamp != AV_NOPTS_VALUE) {
1449  /* catch up */
1450  pls->seek_timestamp = c->cur_timestamp;
1451  pls->seek_flags = AVSEEK_FLAG_ANY;
1452  pls->seek_stream_index = -1;
1453  }
1454  av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
1455  } else if (first && !pls->cur_needed && pls->needed) {
1456  if (pls->input)
1457  ffurl_close(pls->input);
1458  pls->input = NULL;
1459  pls->needed = 0;
1460  changed = 1;
1461  av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
1462  }
1463  }
1464  return changed;
1465 }
1466 
1468 {
1469  if (pls->id3_offset >= 0) {
1470  pls->pkt.dts = pls->id3_mpegts_timestamp +
1471  av_rescale_q(pls->id3_offset,
1472  pls->ctx->streams[pls->pkt.stream_index]->time_base,
1474  if (pls->pkt.duration)
1475  pls->id3_offset += pls->pkt.duration;
1476  else
1477  pls->id3_offset = -1;
1478  } else {
1479  /* there have been packets with unknown duration
1480  * since the last id3 tag, should not normally happen */
1481  pls->pkt.dts = AV_NOPTS_VALUE;
1482  }
1483 
1484  if (pls->pkt.duration)
1485  pls->pkt.duration = av_rescale_q(pls->pkt.duration,
1486  pls->ctx->streams[pls->pkt.stream_index]->time_base,
1488 
1489  pls->pkt.pts = AV_NOPTS_VALUE;
1490 }
1491 
1492 static AVRational get_timebase(struct playlist *pls)
1493 {
1494  if (pls->is_id3_timestamped)
1495  return MPEG_TIME_BASE_Q;
1496 
1497  return pls->ctx->streams[pls->pkt.stream_index]->time_base;
1498 }
1499 
1500 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
1501  int64_t ts_b, struct playlist *pls_b)
1502 {
1503  int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
1504  int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
1505 
1506  return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
1507 }
1508 
1510 {
1511  HLSContext *c = s->priv_data;
1512  int ret, i, minplaylist = -1;
1513 
1515 
1516  for (i = 0; i < c->n_playlists; i++) {
1517  struct playlist *pls = c->playlists[i];
1518  /* Make sure we've got one buffered packet from each open playlist
1519  * stream */
1520  if (pls->needed && !pls->pkt.data) {
1521  while (1) {
1522  int64_t ts_diff;
1523  AVRational tb;
1524  ret = av_read_frame(pls->ctx, &pls->pkt);
1525  if (ret < 0) {
1526  if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
1527  return ret;
1528  reset_packet(&pls->pkt);
1529  break;
1530  } else {
1531  /* stream_index check prevents matching picture attachments etc. */
1532  if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
1533  /* audio elementary streams are id3 timestamped */
1535  }
1536 
1537  if (c->first_timestamp == AV_NOPTS_VALUE &&
1538  pls->pkt.dts != AV_NOPTS_VALUE)
1539  c->first_timestamp = av_rescale_q(pls->pkt.dts,
1541  }
1542 
1543  if (pls->seek_timestamp == AV_NOPTS_VALUE)
1544  break;
1545 
1546  if (pls->seek_stream_index < 0 ||
1547  pls->seek_stream_index == pls->pkt.stream_index) {
1548 
1549  if (pls->pkt.dts == AV_NOPTS_VALUE) {
1551  break;
1552  }
1553 
1554  tb = get_timebase(pls);
1555  ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
1556  tb.den, AV_ROUND_DOWN) -
1557  pls->seek_timestamp;
1558  if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
1559  pls->pkt.flags & AV_PKT_FLAG_KEY)) {
1561  break;
1562  }
1563  }
1564  av_free_packet(&pls->pkt);
1565  reset_packet(&pls->pkt);
1566  }
1567  }
1568  /* Check if this stream has the packet with the lowest dts */
1569  if (pls->pkt.data) {
1570  struct playlist *minpls = minplaylist < 0 ?
1571  NULL : c->playlists[minplaylist];
1572  if (minplaylist < 0) {
1573  minplaylist = i;
1574  } else {
1575  int64_t dts = pls->pkt.dts;
1576  int64_t mindts = minpls->pkt.dts;
1577 
1578  if (dts == AV_NOPTS_VALUE ||
1579  (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
1580  minplaylist = i;
1581  }
1582  }
1583  }
1584 
1585  /* If we got a packet, return it */
1586  if (minplaylist >= 0) {
1587  struct playlist *pls = c->playlists[minplaylist];
1588  *pkt = pls->pkt;
1589  pkt->stream_index += pls->stream_offset;
1590  reset_packet(&c->playlists[minplaylist]->pkt);
1591 
1592  if (pkt->dts != AV_NOPTS_VALUE)
1593  c->cur_timestamp = av_rescale_q(pkt->dts,
1594  pls->ctx->streams[pls->pkt.stream_index]->time_base,
1595  AV_TIME_BASE_Q);
1596 
1597  return 0;
1598  }
1599  return AVERROR_EOF;
1600 }
1601 
1603 {
1604  HLSContext *c = s->priv_data;
1605 
1606  free_playlist_list(c);
1607  free_variant_list(c);
1609  return 0;
1610 }
1611 
1612 static int hls_read_seek(AVFormatContext *s, int stream_index,
1613  int64_t timestamp, int flags)
1614 {
1615  HLSContext *c = s->priv_data;
1616  struct playlist *seek_pls = NULL;
1617  int i, seq_no;
1618  int64_t first_timestamp, seek_timestamp, duration;
1619 
1620  if ((flags & AVSEEK_FLAG_BYTE) ||
1621  !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
1622  return AVERROR(ENOSYS);
1623 
1624  first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
1625  0 : c->first_timestamp;
1626 
1627  seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
1628  s->streams[stream_index]->time_base.den,
1629  flags & AVSEEK_FLAG_BACKWARD ?
1631 
1632  duration = s->duration == AV_NOPTS_VALUE ?
1633  0 : s->duration;
1634 
1635  if (0 < duration && duration < seek_timestamp - first_timestamp)
1636  return AVERROR(EIO);
1637 
1638  /* find the playlist with the specified stream */
1639  for (i = 0; i < c->n_playlists; i++) {
1640  struct playlist *pls = c->playlists[i];
1641  if (stream_index >= pls->stream_offset &&
1642  stream_index - pls->stream_offset < pls->ctx->nb_streams) {
1643  seek_pls = pls;
1644  break;
1645  }
1646  }
1647  /* check if the timestamp is valid for the playlist with the
1648  * specified stream index */
1649  if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
1650  return AVERROR(EIO);
1651 
1652  /* set segment now so we do not need to search again below */
1653  seek_pls->cur_seq_no = seq_no;
1654  seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset;
1655 
1656  for (i = 0; i < c->n_playlists; i++) {
1657  /* Reset reading */
1658  struct playlist *pls = c->playlists[i];
1659  if (pls->input) {
1660  ffurl_close(pls->input);
1661  pls->input = NULL;
1662  }
1663  av_free_packet(&pls->pkt);
1664  reset_packet(&pls->pkt);
1665  pls->pb.eof_reached = 0;
1666  /* Clear any buffered data */
1667  pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
1668  /* Reset the pos, to let the mpegts demuxer know we've seeked. */
1669  pls->pb.pos = 0;
1670  /* Flush the packet queue of the subdemuxer. */
1671  ff_read_frame_flush(pls->ctx);
1672 
1674  pls->seek_flags = flags;
1675 
1676  if (pls != seek_pls) {
1677  /* set closest segment seq_no for playlists not handled above */
1678  find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
1679  /* seek the playlist to the given position without taking
1680  * keyframes into account since this playlist does not have the
1681  * specified stream where we should look for the keyframes */
1682  pls->seek_stream_index = -1;
1683  pls->seek_flags |= AVSEEK_FLAG_ANY;
1684  }
1685  }
1686 
1688 
1689  return 0;
1690 }
1691 
1692 static int hls_probe(AVProbeData *p)
1693 {
1694  /* Require #EXTM3U at the start, and either one of the ones below
1695  * somewhere for a proper match. */
1696  if (strncmp(p->buf, "#EXTM3U", 7))
1697  return 0;
1698  if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
1699  strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
1700  strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
1701  return AVPROBE_SCORE_MAX;
1702  return 0;
1703 }
1704 
1706  .name = "hls,applehttp",
1707  .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
1708  .priv_data_size = sizeof(HLSContext),
1709  .read_probe = hls_probe,
1712  .read_close = hls_close,
1714 };