Libav
hls.c
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1 /*
2  * Apple HTTP Live Streaming demuxer
3  * Copyright (c) 2010 Martin Storsjo
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
28 #include "libavutil/avstring.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/dict.h"
33 #include "libavutil/time.h"
34 #include "avformat.h"
35 #include "internal.h"
36 #include "avio_internal.h"
37 #include "url.h"
38 
39 #define INITIAL_BUFFER_SIZE 32768
40 
41 /*
42  * An apple http stream consists of a playlist with media segment files,
43  * played sequentially. There may be several playlists with the same
44  * video content, in different bandwidth variants, that are played in
45  * parallel (preferably only one bandwidth variant at a time). In this case,
46  * the user supplied the url to a main playlist that only lists the variant
47  * playlists.
48  *
49  * If the main playlist doesn't point at any variants, we still create
50  * one anonymous toplevel variant for this, to maintain the structure.
51  */
52 
53 enum KeyType {
56 };
57 
58 struct segment {
59  int64_t duration;
63  uint8_t iv[16];
64 };
65 
66 /*
67  * Each variant has its own demuxer. If it currently is active,
68  * it has an open AVIOContext too, and potentially an AVPacket
69  * containing the next packet from this stream.
70  */
71 struct variant {
72  int bandwidth;
78  int index;
82 
83  int finished;
84  int64_t target_duration;
87  struct segment **segments;
90  int64_t last_load_time;
91 
93  uint8_t key[16];
94 };
95 
96 typedef struct HLSContext {
98  struct variant **variants;
103  int64_t seek_timestamp;
106 } HLSContext;
107 
108 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
109 {
110  int len = ff_get_line(s, buf, maxlen);
111  while (len > 0 && av_isspace(buf[len - 1]))
112  buf[--len] = '\0';
113  return len;
114 }
115 
116 static void free_segment_list(struct variant *var)
117 {
118  int i;
119  for (i = 0; i < var->n_segments; i++)
120  av_free(var->segments[i]);
121  av_freep(&var->segments);
122  var->n_segments = 0;
123 }
124 
126 {
127  int i;
128  for (i = 0; i < c->n_variants; i++) {
129  struct variant *var = c->variants[i];
130  free_segment_list(var);
131  av_free_packet(&var->pkt);
132  av_free(var->pb.buffer);
133  if (var->input)
134  ffurl_close(var->input);
135  if (var->ctx) {
136  var->ctx->pb = NULL;
137  avformat_close_input(&var->ctx);
138  }
139  av_free(var);
140  }
141  av_freep(&c->variants);
142  c->n_variants = 0;
143 }
144 
145 /*
146  * Used to reset a statically allocated AVPacket to a clean slate,
147  * containing no data.
148  */
149 static void reset_packet(AVPacket *pkt)
150 {
151  av_init_packet(pkt);
152  pkt->data = NULL;
153 }
154 
155 static struct variant *new_variant(HLSContext *c, int bandwidth,
156  const char *url, const char *base)
157 {
158  struct variant *var = av_mallocz(sizeof(struct variant));
159  if (!var)
160  return NULL;
161  reset_packet(&var->pkt);
162  var->bandwidth = bandwidth;
163  ff_make_absolute_url(var->url, sizeof(var->url), base, url);
164  dynarray_add(&c->variants, &c->n_variants, var);
165  return var;
166 }
167 
168 struct variant_info {
169  char bandwidth[20];
170 };
171 
172 static void handle_variant_args(struct variant_info *info, const char *key,
173  int key_len, char **dest, int *dest_len)
174 {
175  if (!strncmp(key, "BANDWIDTH=", key_len)) {
176  *dest = info->bandwidth;
177  *dest_len = sizeof(info->bandwidth);
178  }
179 }
180 
181 struct key_info {
183  char method[10];
184  char iv[35];
185 };
186 
187 static void handle_key_args(struct key_info *info, const char *key,
188  int key_len, char **dest, int *dest_len)
189 {
190  if (!strncmp(key, "METHOD=", key_len)) {
191  *dest = info->method;
192  *dest_len = sizeof(info->method);
193  } else if (!strncmp(key, "URI=", key_len)) {
194  *dest = info->uri;
195  *dest_len = sizeof(info->uri);
196  } else if (!strncmp(key, "IV=", key_len)) {
197  *dest = info->iv;
198  *dest_len = sizeof(info->iv);
199  }
200 }
201 
202 static int parse_playlist(HLSContext *c, const char *url,
203  struct variant *var, AVIOContext *in)
204 {
205  int ret = 0, is_segment = 0, is_variant = 0, bandwidth = 0;
206  int64_t duration = 0;
207  enum KeyType key_type = KEY_NONE;
208  uint8_t iv[16] = "";
209  int has_iv = 0;
210  char key[MAX_URL_SIZE] = "";
211  char line[1024];
212  const char *ptr;
213  int close_in = 0;
214  uint8_t *new_url = NULL;
215 
216  if (!in) {
217  close_in = 1;
218  if ((ret = avio_open2(&in, url, AVIO_FLAG_READ,
219  c->interrupt_callback, NULL)) < 0)
220  return ret;
221  }
222 
223  if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
224  url = new_url;
225 
226  read_chomp_line(in, line, sizeof(line));
227  if (strcmp(line, "#EXTM3U")) {
228  ret = AVERROR_INVALIDDATA;
229  goto fail;
230  }
231 
232  if (var) {
233  free_segment_list(var);
234  var->finished = 0;
235  }
236  while (!in->eof_reached) {
237  read_chomp_line(in, line, sizeof(line));
238  if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
239  struct variant_info info = {{0}};
240  is_variant = 1;
242  &info);
243  bandwidth = atoi(info.bandwidth);
244  } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
245  struct key_info info = {{0}};
247  &info);
248  key_type = KEY_NONE;
249  has_iv = 0;
250  if (!strcmp(info.method, "AES-128"))
251  key_type = KEY_AES_128;
252  if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
253  ff_hex_to_data(iv, info.iv + 2);
254  has_iv = 1;
255  }
256  av_strlcpy(key, info.uri, sizeof(key));
257  } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
258  if (!var) {
259  var = new_variant(c, 0, url, NULL);
260  if (!var) {
261  ret = AVERROR(ENOMEM);
262  goto fail;
263  }
264  }
265  var->target_duration = atoi(ptr) * AV_TIME_BASE;
266  } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
267  if (!var) {
268  var = new_variant(c, 0, url, NULL);
269  if (!var) {
270  ret = AVERROR(ENOMEM);
271  goto fail;
272  }
273  }
274  var->start_seq_no = atoi(ptr);
275  } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
276  if (var)
277  var->finished = 1;
278  } else if (av_strstart(line, "#EXTINF:", &ptr)) {
279  is_segment = 1;
280  duration = atof(ptr) * AV_TIME_BASE;
281  } else if (av_strstart(line, "#", NULL)) {
282  continue;
283  } else if (line[0]) {
284  if (is_variant) {
285  if (!new_variant(c, bandwidth, line, url)) {
286  ret = AVERROR(ENOMEM);
287  goto fail;
288  }
289  is_variant = 0;
290  bandwidth = 0;
291  }
292  if (is_segment) {
293  struct segment *seg;
294  if (!var) {
295  var = new_variant(c, 0, url, NULL);
296  if (!var) {
297  ret = AVERROR(ENOMEM);
298  goto fail;
299  }
300  }
301  seg = av_malloc(sizeof(struct segment));
302  if (!seg) {
303  ret = AVERROR(ENOMEM);
304  goto fail;
305  }
306  seg->duration = duration;
307  seg->key_type = key_type;
308  if (has_iv) {
309  memcpy(seg->iv, iv, sizeof(iv));
310  } else {
311  int seq = var->start_seq_no + var->n_segments;
312  memset(seg->iv, 0, sizeof(seg->iv));
313  AV_WB32(seg->iv + 12, seq);
314  }
315  ff_make_absolute_url(seg->key, sizeof(seg->key), url, key);
316  ff_make_absolute_url(seg->url, sizeof(seg->url), url, line);
317  dynarray_add(&var->segments, &var->n_segments, seg);
318  is_segment = 0;
319  }
320  }
321  }
322  if (var)
323  var->last_load_time = av_gettime();
324 
325 fail:
326  av_free(new_url);
327  if (close_in)
328  avio_close(in);
329  return ret;
330 }
331 
332 static int open_input(struct variant *var)
333 {
334  struct segment *seg = var->segments[var->cur_seq_no - var->start_seq_no];
335  if (seg->key_type == KEY_NONE) {
336  return ffurl_open(&var->input, seg->url, AVIO_FLAG_READ,
337  &var->parent->interrupt_callback, NULL);
338  } else if (seg->key_type == KEY_AES_128) {
339  char iv[33], key[33], url[MAX_URL_SIZE];
340  int ret;
341  if (strcmp(seg->key, var->key_url)) {
342  URLContext *uc;
343  if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
344  &var->parent->interrupt_callback, NULL) == 0) {
345  if (ffurl_read_complete(uc, var->key, sizeof(var->key))
346  != sizeof(var->key)) {
347  av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
348  seg->key);
349  }
350  ffurl_close(uc);
351  } else {
352  av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
353  seg->key);
354  }
355  av_strlcpy(var->key_url, seg->key, sizeof(var->key_url));
356  }
357  ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
358  ff_data_to_hex(key, var->key, sizeof(var->key), 0);
359  iv[32] = key[32] = '\0';
360  if (strstr(seg->url, "://"))
361  snprintf(url, sizeof(url), "crypto+%s", seg->url);
362  else
363  snprintf(url, sizeof(url), "crypto:%s", seg->url);
364  if ((ret = ffurl_alloc(&var->input, url, AVIO_FLAG_READ,
365  &var->parent->interrupt_callback)) < 0)
366  return ret;
367  av_opt_set(var->input->priv_data, "key", key, 0);
368  av_opt_set(var->input->priv_data, "iv", iv, 0);
369  if ((ret = ffurl_connect(var->input, NULL)) < 0) {
370  ffurl_close(var->input);
371  var->input = NULL;
372  return ret;
373  }
374  return 0;
375  }
376  return AVERROR(ENOSYS);
377 }
378 
379 static int read_data(void *opaque, uint8_t *buf, int buf_size)
380 {
381  struct variant *v = opaque;
382  HLSContext *c = v->parent->priv_data;
383  int ret, i;
384 
385 restart:
386  if (!v->input) {
387  /* If this is a live stream and the reload interval has elapsed since
388  * the last playlist reload, reload the variant playlists now. */
389  int64_t reload_interval = v->n_segments > 0 ?
390  v->segments[v->n_segments - 1]->duration :
391  v->target_duration;
392 
393 reload:
394  if (!v->finished &&
395  av_gettime() - v->last_load_time >= reload_interval) {
396  if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
397  return ret;
398  /* If we need to reload the playlist again below (if
399  * there's still no more segments), switch to a reload
400  * interval of half the target duration. */
401  reload_interval = v->target_duration / 2;
402  }
403  if (v->cur_seq_no < v->start_seq_no) {
405  "skipping %d segments ahead, expired from playlists\n",
406  v->start_seq_no - v->cur_seq_no);
407  v->cur_seq_no = v->start_seq_no;
408  }
409  if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
410  if (v->finished)
411  return AVERROR_EOF;
412  while (av_gettime() - v->last_load_time < reload_interval) {
414  return AVERROR_EXIT;
415  av_usleep(100*1000);
416  }
417  /* Enough time has elapsed since the last reload */
418  goto reload;
419  }
420 
421  ret = open_input(v);
422  if (ret < 0)
423  return ret;
424  }
425  ret = ffurl_read(v->input, buf, buf_size);
426  if (ret > 0)
427  return ret;
428  ffurl_close(v->input);
429  v->input = NULL;
430  v->cur_seq_no++;
431 
432  c->end_of_segment = 1;
433  c->cur_seq_no = v->cur_seq_no;
434 
435  if (v->ctx && v->ctx->nb_streams &&
436  v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
437  v->needed = 0;
438  for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
439  i++) {
440  if (v->parent->streams[i]->discard < AVDISCARD_ALL)
441  v->needed = 1;
442  }
443  }
444  if (!v->needed) {
445  av_log(v->parent, AV_LOG_INFO, "No longer receiving variant %d\n",
446  v->index);
447  return AVERROR_EOF;
448  }
449  goto restart;
450 }
451 
453 {
454  HLSContext *c = s->priv_data;
455  int ret = 0, i, j, stream_offset = 0;
456 
458 
459  if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
460  goto fail;
461 
462  if (c->n_variants == 0) {
463  av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
464  ret = AVERROR_EOF;
465  goto fail;
466  }
467  /* If the playlist only contained variants, parse each individual
468  * variant playlist. */
469  if (c->n_variants > 1 || c->variants[0]->n_segments == 0) {
470  for (i = 0; i < c->n_variants; i++) {
471  struct variant *v = c->variants[i];
472  if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
473  goto fail;
474  }
475  }
476 
477  if (c->variants[0]->n_segments == 0) {
478  av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
479  ret = AVERROR_EOF;
480  goto fail;
481  }
482 
483  /* If this isn't a live stream, calculate the total duration of the
484  * stream. */
485  if (c->variants[0]->finished) {
486  int64_t duration = 0;
487  for (i = 0; i < c->variants[0]->n_segments; i++)
488  duration += c->variants[0]->segments[i]->duration;
489  s->duration = duration;
490  }
491 
492  /* Open the demuxer for each variant */
493  for (i = 0; i < c->n_variants; i++) {
494  struct variant *v = c->variants[i];
495  AVInputFormat *in_fmt = NULL;
496  char bitrate_str[20];
497  AVProgram *program;
498 
499  if (v->n_segments == 0)
500  continue;
501 
502  if (!(v->ctx = avformat_alloc_context())) {
503  ret = AVERROR(ENOMEM);
504  goto fail;
505  }
506 
507  v->index = i;
508  v->needed = 1;
509  v->parent = s;
510 
511  /* If this is a live stream with more than 3 segments, start at the
512  * third last segment. */
513  v->cur_seq_no = v->start_seq_no;
514  if (!v->finished && v->n_segments > 3)
515  v->cur_seq_no = v->start_seq_no + v->n_segments - 3;
516 
519  read_data, NULL, NULL);
520  v->pb.seekable = 0;
521  ret = av_probe_input_buffer(&v->pb, &in_fmt, v->segments[0]->url,
522  NULL, 0, 0);
523  if (ret < 0) {
524  /* Free the ctx - it isn't initialized properly at this point,
525  * so avformat_close_input shouldn't be called. If
526  * avformat_open_input fails below, it frees and zeros the
527  * context, so it doesn't need any special treatment like this. */
529  v->ctx = NULL;
530  goto fail;
531  }
532  v->ctx->pb = &v->pb;
534  ret = avformat_open_input(&v->ctx, v->segments[0]->url, in_fmt, NULL);
535  if (ret < 0)
536  goto fail;
537 
540  if (ret < 0)
541  goto fail;
542  snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth);
543 
544  program = av_new_program(s, i);
545  if (!program)
546  goto fail;
547  av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0);
548 
549  /* Create new AVStreams for each stream in this variant */
550  for (j = 0; j < v->ctx->nb_streams; j++) {
552  AVStream *ist = v->ctx->streams[j];
553  if (!st) {
554  ret = AVERROR(ENOMEM);
555  goto fail;
556  }
557  ff_program_add_stream_index(s, i, stream_offset + j);
558  st->id = i;
561  if (v->bandwidth)
562  av_dict_set(&st->metadata, "variant_bitrate", bitrate_str,
563  0);
564  }
565  stream_offset += v->ctx->nb_streams;
566  }
567 
568  c->first_packet = 1;
571 
572  return 0;
573 fail:
575  return ret;
576 }
577 
578 static int recheck_discard_flags(AVFormatContext *s, int first)
579 {
580  HLSContext *c = s->priv_data;
581  int i, changed = 0;
582 
583  /* Check if any new streams are needed */
584  for (i = 0; i < c->n_variants; i++)
585  c->variants[i]->cur_needed = 0;;
586 
587  for (i = 0; i < s->nb_streams; i++) {
588  AVStream *st = s->streams[i];
589  struct variant *var = c->variants[s->streams[i]->id];
590  if (st->discard < AVDISCARD_ALL)
591  var->cur_needed = 1;
592  }
593  for (i = 0; i < c->n_variants; i++) {
594  struct variant *v = c->variants[i];
595  if (v->cur_needed && !v->needed) {
596  v->needed = 1;
597  changed = 1;
598  v->cur_seq_no = c->cur_seq_no;
599  v->pb.eof_reached = 0;
600  av_log(s, AV_LOG_INFO, "Now receiving variant %d\n", i);
601  } else if (first && !v->cur_needed && v->needed) {
602  if (v->input)
603  ffurl_close(v->input);
604  v->input = NULL;
605  v->needed = 0;
606  changed = 1;
607  av_log(s, AV_LOG_INFO, "No longer receiving variant %d\n", i);
608  }
609  }
610  return changed;
611 }
612 
614 {
615  HLSContext *c = s->priv_data;
616  int ret, i, minvariant = -1;
617 
618  if (c->first_packet) {
619  recheck_discard_flags(s, 1);
620  c->first_packet = 0;
621  }
622 
623 start:
624  c->end_of_segment = 0;
625  for (i = 0; i < c->n_variants; i++) {
626  struct variant *var = c->variants[i];
627  /* Make sure we've got one buffered packet from each open variant
628  * stream */
629  if (var->needed && !var->pkt.data) {
630  while (1) {
631  int64_t ts_diff;
632  AVStream *st;
633  ret = av_read_frame(var->ctx, &var->pkt);
634  if (ret < 0) {
635  if (!var->pb.eof_reached)
636  return ret;
637  reset_packet(&var->pkt);
638  break;
639  } else {
640  if (c->first_timestamp == AV_NOPTS_VALUE &&
641  var->pkt.dts != AV_NOPTS_VALUE)
643  var->ctx->streams[var->pkt.stream_index]->time_base,
645  }
646 
647  if (c->seek_timestamp == AV_NOPTS_VALUE)
648  break;
649 
650  if (var->pkt.dts == AV_NOPTS_VALUE) {
652  break;
653  }
654 
655  st = var->ctx->streams[var->pkt.stream_index];
656  ts_diff = av_rescale_rnd(var->pkt.dts, AV_TIME_BASE,
657  st->time_base.den, AV_ROUND_DOWN) -
658  c->seek_timestamp;
659  if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY ||
660  var->pkt.flags & AV_PKT_FLAG_KEY)) {
662  break;
663  }
664  av_free_packet(&var->pkt);
665  reset_packet(&var->pkt);
666  }
667  }
668  /* Check if this stream still is on an earlier segment number, or
669  * has the packet with the lowest dts */
670  if (var->pkt.data) {
671  struct variant *minvar = minvariant < 0 ?
672  NULL : c->variants[minvariant];
673  if (minvariant < 0 || var->cur_seq_no < minvar->cur_seq_no) {
674  minvariant = i;
675  } else if (var->cur_seq_no == minvar->cur_seq_no) {
676  int64_t dts = var->pkt.dts;
677  int64_t mindts = minvar->pkt.dts;
678  AVStream *st = var->ctx->streams[var->pkt.stream_index];
679  AVStream *minst = minvar->ctx->streams[minvar->pkt.stream_index];
680 
681  if (dts == AV_NOPTS_VALUE) {
682  minvariant = i;
683  } else if (mindts != AV_NOPTS_VALUE) {
684  if (st->start_time != AV_NOPTS_VALUE)
685  dts -= st->start_time;
686  if (minst->start_time != AV_NOPTS_VALUE)
687  mindts -= minst->start_time;
688 
689  if (av_compare_ts(dts, st->time_base,
690  mindts, minst->time_base) < 0)
691  minvariant = i;
692  }
693  }
694  }
695  }
696  if (c->end_of_segment) {
697  if (recheck_discard_flags(s, 0))
698  goto start;
699  }
700  /* If we got a packet, return it */
701  if (minvariant >= 0) {
702  *pkt = c->variants[minvariant]->pkt;
703  pkt->stream_index += c->variants[minvariant]->stream_offset;
704  reset_packet(&c->variants[minvariant]->pkt);
705  return 0;
706  }
707  return AVERROR_EOF;
708 }
709 
711 {
712  HLSContext *c = s->priv_data;
713 
715  return 0;
716 }
717 
718 static int hls_read_seek(AVFormatContext *s, int stream_index,
719  int64_t timestamp, int flags)
720 {
721  HLSContext *c = s->priv_data;
722  int i, j, ret;
723 
724  if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->finished)
725  return AVERROR(ENOSYS);
726 
727  c->seek_flags = flags;
728  c->seek_timestamp = stream_index < 0 ? timestamp :
729  av_rescale_rnd(timestamp, AV_TIME_BASE,
730  s->streams[stream_index]->time_base.den,
731  flags & AVSEEK_FLAG_BACKWARD ?
733  timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, stream_index >= 0 ?
734  s->streams[stream_index]->time_base.den :
736  AV_ROUND_DOWN : AV_ROUND_UP);
737  if (s->duration < c->seek_timestamp) {
739  return AVERROR(EIO);
740  }
741 
742  ret = AVERROR(EIO);
743  for (i = 0; i < c->n_variants; i++) {
744  /* Reset reading */
745  struct variant *var = c->variants[i];
746  int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
747  0 : c->first_timestamp;
748  if (var->input) {
749  ffurl_close(var->input);
750  var->input = NULL;
751  }
752  av_free_packet(&var->pkt);
753  reset_packet(&var->pkt);
754  var->pb.eof_reached = 0;
755  /* Clear any buffered data */
756  var->pb.buf_end = var->pb.buf_ptr = var->pb.buffer;
757  /* Reset the pos, to let the mpegts demuxer know we've seeked. */
758  var->pb.pos = 0;
759 
760  /* Locate the segment that contains the target timestamp */
761  for (j = 0; j < var->n_segments; j++) {
762  if (timestamp >= pos &&
763  timestamp < pos + var->segments[j]->duration) {
764  var->cur_seq_no = var->start_seq_no + j;
765  ret = 0;
766  break;
767  }
768  pos += var->segments[j]->duration;
769  }
770  if (ret)
772  }
773  return ret;
774 }
775 
776 static int hls_probe(AVProbeData *p)
777 {
778  /* Require #EXTM3U at the start, and either one of the ones below
779  * somewhere for a proper match. */
780  if (strncmp(p->buf, "#EXTM3U", 7))
781  return 0;
782  if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
783  strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
784  strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
785  return AVPROBE_SCORE_MAX;
786  return 0;
787 }
788 
790  .name = "hls,applehttp",
791  .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
792  .priv_data_size = sizeof(HLSContext),
798 };