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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 FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Apple HTTP Live Streaming demuxer
25  * http://tools.ietf.org/html/draft-pantos-http-live-streaming
26  */
27 
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  int 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;
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 && 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, duration = 0, is_segment = 0, is_variant = 0, bandwidth = 0;
206  enum KeyType key_type = KEY_NONE;
207  uint8_t iv[16] = "";
208  int has_iv = 0;
209  char key[MAX_URL_SIZE] = "";
210  char line[1024];
211  const char *ptr;
212  int close_in = 0;
213 
214  if (!in) {
215  AVDictionary *opts = NULL;
216  close_in = 1;
217  /* Some HLS servers dont like being sent the range header */
218  av_dict_set(&opts, "seekable", "0", 0);
219  ret = avio_open2(&in, url, AVIO_FLAG_READ,
220  c->interrupt_callback, &opts);
221  av_dict_free(&opts);
222  if (ret < 0)
223  return ret;
224  }
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 (!url_feof(in)) {
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);
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 = atoi(ptr);
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  if (close_in)
327  avio_close(in);
328  return ret;
329 }
330 
331 static int open_input(struct variant *var)
332 {
333  AVDictionary *opts = NULL;
334  int ret;
335  struct segment *seg = var->segments[var->cur_seq_no - var->start_seq_no];
336  av_dict_set(&opts, "seekable", "0", 0);
337  if (seg->key_type == KEY_NONE) {
338  ret = ffurl_open(&var->input, seg->url, AVIO_FLAG_READ,
339  &var->parent->interrupt_callback, &opts);
340  goto cleanup;
341  } else if (seg->key_type == KEY_AES_128) {
342  char iv[33], key[33], url[MAX_URL_SIZE];
343  if (strcmp(seg->key, var->key_url)) {
344  URLContext *uc;
345  if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
346  &var->parent->interrupt_callback, &opts) == 0) {
347  if (ffurl_read_complete(uc, var->key, sizeof(var->key))
348  != sizeof(var->key)) {
349  av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
350  seg->key);
351  }
352  ffurl_close(uc);
353  } else {
354  av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
355  seg->key);
356  }
357  av_strlcpy(var->key_url, seg->key, sizeof(var->key_url));
358  }
359  ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
360  ff_data_to_hex(key, var->key, sizeof(var->key), 0);
361  iv[32] = key[32] = '\0';
362  if (strstr(seg->url, "://"))
363  snprintf(url, sizeof(url), "crypto+%s", seg->url);
364  else
365  snprintf(url, sizeof(url), "crypto:%s", seg->url);
366  if ((ret = ffurl_alloc(&var->input, url, AVIO_FLAG_READ,
367  &var->parent->interrupt_callback)) < 0)
368  goto cleanup;
369  av_opt_set(var->input->priv_data, "key", key, 0);
370  av_opt_set(var->input->priv_data, "iv", iv, 0);
371  /* Need to repopulate options */
372  av_dict_free(&opts);
373  av_dict_set(&opts, "seekable", "0", 0);
374  if ((ret = ffurl_connect(var->input, &opts)) < 0) {
375  ffurl_close(var->input);
376  var->input = NULL;
377  goto cleanup;
378  }
379  ret = 0;
380  }
381  else
382  ret = AVERROR(ENOSYS);
383 
384 cleanup:
385  av_dict_free(&opts);
386  return ret;
387 }
388 
389 static int read_data(void *opaque, uint8_t *buf, int buf_size)
390 {
391  struct variant *v = opaque;
392  HLSContext *c = v->parent->priv_data;
393  int ret, i;
394 
395 restart:
396  if (!v->input) {
397  /* If this is a live stream and the reload interval has elapsed since
398  * the last playlist reload, reload the variant playlists now. */
399  int64_t reload_interval = v->n_segments > 0 ?
400  v->segments[v->n_segments - 1]->duration :
401  v->target_duration;
402  reload_interval *= 1000000;
403 
404 reload:
405  if (!v->finished &&
406  av_gettime() - v->last_load_time >= reload_interval) {
407  if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
408  return ret;
409  /* If we need to reload the playlist again below (if
410  * there's still no more segments), switch to a reload
411  * interval of half the target duration. */
412  reload_interval = v->target_duration * 500000LL;
413  }
414  if (v->cur_seq_no < v->start_seq_no) {
416  "skipping %d segments ahead, expired from playlists\n",
417  v->start_seq_no - v->cur_seq_no);
418  v->cur_seq_no = v->start_seq_no;
419  }
420  if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
421  if (v->finished)
422  return AVERROR_EOF;
423  while (av_gettime() - v->last_load_time < reload_interval) {
425  return AVERROR_EXIT;
426  av_usleep(100*1000);
427  }
428  /* Enough time has elapsed since the last reload */
429  goto reload;
430  }
431 
432  ret = open_input(v);
433  if (ret < 0)
434  return ret;
435  }
436  ret = ffurl_read(v->input, buf, buf_size);
437  if (ret > 0)
438  return ret;
439  ffurl_close(v->input);
440  v->input = NULL;
441  v->cur_seq_no++;
442 
443  c->end_of_segment = 1;
444  c->cur_seq_no = v->cur_seq_no;
445 
446  if (v->ctx && v->ctx->nb_streams && v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
447  v->needed = 0;
448  for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
449  i++) {
450  if (v->parent->streams[i]->discard < AVDISCARD_ALL)
451  v->needed = 1;
452  }
453  }
454  if (!v->needed) {
455  av_log(v->parent, AV_LOG_INFO, "No longer receiving variant %d\n",
456  v->index);
457  return AVERROR_EOF;
458  }
459  goto restart;
460 }
461 
463 {
464  HLSContext *c = s->priv_data;
465  int ret = 0, i, j, stream_offset = 0;
466 
468 
469  if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
470  goto fail;
471 
472  if (c->n_variants == 0) {
473  av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
474  ret = AVERROR_EOF;
475  goto fail;
476  }
477  /* If the playlist only contained variants, parse each individual
478  * variant playlist. */
479  if (c->n_variants > 1 || c->variants[0]->n_segments == 0) {
480  for (i = 0; i < c->n_variants; i++) {
481  struct variant *v = c->variants[i];
482  if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
483  goto fail;
484  }
485  }
486 
487  if (c->variants[0]->n_segments == 0) {
488  av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
489  ret = AVERROR_EOF;
490  goto fail;
491  }
492 
493  /* If this isn't a live stream, calculate the total duration of the
494  * stream. */
495  if (c->variants[0]->finished) {
496  int64_t duration = 0;
497  for (i = 0; i < c->variants[0]->n_segments; i++)
498  duration += c->variants[0]->segments[i]->duration;
499  s->duration = duration * AV_TIME_BASE;
500  }
501 
502  /* Open the demuxer for each variant */
503  for (i = 0; i < c->n_variants; i++) {
504  struct variant *v = c->variants[i];
505  AVInputFormat *in_fmt = NULL;
506  char bitrate_str[20];
507  AVProgram *program = NULL;
508  if (v->n_segments == 0)
509  continue;
510 
511  if (!(v->ctx = avformat_alloc_context())) {
512  ret = AVERROR(ENOMEM);
513  goto fail;
514  }
515 
516  v->index = i;
517  v->needed = 1;
518  v->parent = s;
519 
520  /* If this is a live stream with more than 3 segments, start at the
521  * third last segment. */
522  v->cur_seq_no = v->start_seq_no;
523  if (!v->finished && v->n_segments > 3)
524  v->cur_seq_no = v->start_seq_no + v->n_segments - 3;
525 
528  read_data, NULL, NULL);
529  v->pb.seekable = 0;
530  ret = av_probe_input_buffer(&v->pb, &in_fmt, v->segments[0]->url,
531  NULL, 0, 0);
532  if (ret < 0) {
533  /* Free the ctx - it isn't initialized properly at this point,
534  * so avformat_close_input shouldn't be called. If
535  * avformat_open_input fails below, it frees and zeros the
536  * context, so it doesn't need any special treatment like this. */
537  av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", v->segments[0]->url);
539  v->ctx = NULL;
540  goto fail;
541  }
542  v->ctx->pb = &v->pb;
543  ret = avformat_open_input(&v->ctx, v->segments[0]->url, in_fmt, NULL);
544  if (ret < 0)
545  goto fail;
546 
550  if (ret < 0)
551  goto fail;
552  snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth);
553 
554  /* Create new AVprogram for variant i */
555  program = av_new_program(s, i);
556  if (!program)
557  goto fail;
558  av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0);
559 
560  /* Create new AVStreams for each stream in this variant */
561  for (j = 0; j < v->ctx->nb_streams; j++) {
563  AVStream *ist = v->ctx->streams[j];
564  if (!st) {
565  ret = AVERROR(ENOMEM);
566  goto fail;
567  }
568  ff_program_add_stream_index(s, i, stream_offset + j);
569  st->id = i;
572  if (v->bandwidth)
573  av_dict_set(&st->metadata, "variant_bitrate", bitrate_str,
574  0);
575  }
576  stream_offset += v->ctx->nb_streams;
577  }
578 
579  c->first_packet = 1;
582 
583  return 0;
584 fail:
586  return ret;
587 }
588 
589 static int recheck_discard_flags(AVFormatContext *s, int first)
590 {
591  HLSContext *c = s->priv_data;
592  int i, changed = 0;
593 
594  /* Check if any new streams are needed */
595  for (i = 0; i < c->n_variants; i++)
596  c->variants[i]->cur_needed = 0;
597 
598  for (i = 0; i < s->nb_streams; i++) {
599  AVStream *st = s->streams[i];
600  struct variant *var = c->variants[s->streams[i]->id];
601  if (st->discard < AVDISCARD_ALL)
602  var->cur_needed = 1;
603  }
604  for (i = 0; i < c->n_variants; i++) {
605  struct variant *v = c->variants[i];
606  if (v->cur_needed && !v->needed) {
607  v->needed = 1;
608  changed = 1;
609  v->cur_seq_no = c->cur_seq_no;
610  v->pb.eof_reached = 0;
611  av_log(s, AV_LOG_INFO, "Now receiving variant %d\n", i);
612  } else if (first && !v->cur_needed && v->needed) {
613  if (v->input)
614  ffurl_close(v->input);
615  v->input = NULL;
616  v->needed = 0;
617  changed = 1;
618  av_log(s, AV_LOG_INFO, "No longer receiving variant %d\n", i);
619  }
620  }
621  return changed;
622 }
623 
625 {
626  HLSContext *c = s->priv_data;
627  int ret, i, minvariant = -1;
628 
629  if (c->first_packet) {
630  recheck_discard_flags(s, 1);
631  c->first_packet = 0;
632  }
633 
634 start:
635  c->end_of_segment = 0;
636  for (i = 0; i < c->n_variants; i++) {
637  struct variant *var = c->variants[i];
638  /* Make sure we've got one buffered packet from each open variant
639  * stream */
640  if (var->needed && !var->pkt.data) {
641  while (1) {
642  int64_t ts_diff;
643  AVStream *st;
644  ret = av_read_frame(var->ctx, &var->pkt);
645  if (ret < 0) {
646  if (!url_feof(&var->pb) && ret != AVERROR_EOF)
647  return ret;
648  reset_packet(&var->pkt);
649  break;
650  } else {
652  c->first_timestamp = var->pkt.dts;
653  }
654 
655  if (c->seek_timestamp == AV_NOPTS_VALUE)
656  break;
657 
658  if (var->pkt.dts == AV_NOPTS_VALUE) {
660  break;
661  }
662 
663  st = var->ctx->streams[var->pkt.stream_index];
664  ts_diff = av_rescale_rnd(var->pkt.dts, AV_TIME_BASE,
665  st->time_base.den, AV_ROUND_DOWN) -
666  c->seek_timestamp;
667  if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY ||
668  var->pkt.flags & AV_PKT_FLAG_KEY)) {
670  break;
671  }
672  }
673  }
674  /* Check if this stream has the packet with the lowest dts */
675  if (var->pkt.data) {
676  if(minvariant < 0) {
677  minvariant = i;
678  } else {
679  struct variant *minvar = c->variants[minvariant];
680  int64_t dts = var->pkt.dts;
681  int64_t mindts = minvar->pkt.dts;
682  AVStream *st = var->ctx->streams[ var->pkt.stream_index];
683  AVStream *minst= minvar->ctx->streams[minvar->pkt.stream_index];
684 
685  if( st->start_time != AV_NOPTS_VALUE) dts -= st->start_time;
686  if(minst->start_time != AV_NOPTS_VALUE) mindts -= minst->start_time;
687 
688  if (av_compare_ts(dts, st->time_base, mindts, minst->time_base) < 0)
689  minvariant = i;
690  }
691  }
692  }
693  if (c->end_of_segment) {
694  if (recheck_discard_flags(s, 0))
695  goto start;
696  }
697  /* If we got a packet, return it */
698  if (minvariant >= 0) {
699  *pkt = c->variants[minvariant]->pkt;
700  pkt->stream_index += c->variants[minvariant]->stream_offset;
701  reset_packet(&c->variants[minvariant]->pkt);
702  return 0;
703  }
704  return AVERROR_EOF;
705 }
706 
708 {
709  HLSContext *c = s->priv_data;
710 
712  return 0;
713 }
714 
715 static int hls_read_seek(AVFormatContext *s, int stream_index,
716  int64_t timestamp, int flags)
717 {
718  HLSContext *c = s->priv_data;
719  int i, j, ret;
720 
721  if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->finished)
722  return AVERROR(ENOSYS);
723 
724  c->seek_flags = flags;
725  c->seek_timestamp = stream_index < 0 ? timestamp :
726  av_rescale_rnd(timestamp, AV_TIME_BASE,
727  s->streams[stream_index]->time_base.den,
728  flags & AVSEEK_FLAG_BACKWARD ?
730  timestamp = av_rescale_rnd(timestamp, 1, stream_index >= 0 ?
731  s->streams[stream_index]->time_base.den :
733  AV_ROUND_DOWN : AV_ROUND_UP);
734  if (s->duration < c->seek_timestamp) {
736  return AVERROR(EIO);
737  }
738 
739  ret = AVERROR(EIO);
740  for (i = 0; i < c->n_variants; i++) {
741  /* Reset reading */
742  struct variant *var = c->variants[i];
743  int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ? 0 :
744  av_rescale_rnd(c->first_timestamp, 1, stream_index >= 0 ?
745  s->streams[stream_index]->time_base.den :
746  AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ?
747  AV_ROUND_DOWN : AV_ROUND_UP);
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 };