1 /*
2 * Apple HTTP Live Streaming demuxer
3 * Copyright (c) 2010 Martin Storsjo
4 * Copyright (c) 2013 Anssi Hannula
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Apple HTTP Live Streaming demuxer
26 * http://tools.ietf.org/html/draft-pantos-http-live-streaming
27 */
28
29 #include "libavformat/http.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/avassert.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/dict.h"
36 #include "libavutil/time.h"
37 #include "avformat.h"
38 #include "internal.h"
39 #include "avio_internal.h"
40 #include "id3v2.h"
41
42 #define INITIAL_BUFFER_SIZE 32768
43
44 #define MAX_FIELD_LEN 64
45 #define MAX_CHARACTERISTICS_LEN 512
46
47 #define MPEG_TIME_BASE 90000
48 #define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
49
50 /*
51 * An apple http stream consists of a playlist with media segment files,
52 * played sequentially. There may be several playlists with the same
53 * video content, in different bandwidth variants, that are played in
54 * parallel (preferably only one bandwidth variant at a time). In this case,
55 * the user supplied the url to a main playlist that only lists the variant
56 * playlists.
57 *
58 * If the main playlist doesn't point at any variants, we still create
59 * one anonymous toplevel variant for this, to maintain the structure.
60 */
61
62 enum KeyType {
63 KEY_NONE,
64 KEY_AES_128,
65 KEY_SAMPLE_AES
66 };
67
68 struct segment {
69 int64_t duration;
70 int64_t url_offset;
71 int64_t size;
72 char *url;
73 char *key;
74 enum KeyType key_type;
75 uint8_t iv[16];
76 /* associated Media Initialization Section, treated as a segment */
77 struct segment *init_section;
78 };
79
80 struct rendition;
81
82 enum PlaylistType {
83 PLS_TYPE_UNSPECIFIED,
84 PLS_TYPE_EVENT,
85 PLS_TYPE_VOD
86 };
87
88 /*
89 * Each playlist has its own demuxer. If it currently is active,
90 * it has an open AVIOContext too, and potentially an AVPacket
91 * containing the next packet from this stream.
92 */
93 struct playlist {
94 char url[MAX_URL_SIZE];
95 AVIOContext pb;
96 uint8_t* read_buffer;
97 AVIOContext *input;
98 int input_read_done;
99 AVIOContext *input_next;
100 int input_next_requested;
101 AVFormatContext *parent;
102 int index;
103 AVFormatContext *ctx;
104 AVPacket pkt;
105 int has_noheader_flag;
106
107 /* main demuxer streams associated with this playlist
108 * indexed by the subdemuxer stream indexes */
109 AVStream **main_streams;
110 int n_main_streams;
111
112 int finished;
113 enum PlaylistType type;
114 int64_t target_duration;
115 int start_seq_no;
116 int n_segments;
117 struct segment **segments;
118 int needed;
119 int broken;
120 int cur_seq_no;
121 int last_seq_no;
122 int m3u8_hold_counters;
123 int64_t cur_seg_offset;
124 int64_t last_load_time;
125
126 /* Currently active Media Initialization Section */
127 struct segment *cur_init_section;
128 uint8_t *init_sec_buf;
129 unsigned int init_sec_buf_size;
130 unsigned int init_sec_data_len;
131 unsigned int init_sec_buf_read_offset;
132
133 char key_url[MAX_URL_SIZE];
134 uint8_t key[16];
135
136 /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
137 * (and possibly other ID3 tags) in the beginning of each segment) */
138 int is_id3_timestamped; /* -1: not yet known */
139 int64_t id3_mpegts_timestamp; /* in mpegts tb */
140 int64_t id3_offset; /* in stream original tb */
141 uint8_t* id3_buf; /* temp buffer for id3 parsing */
142 unsigned int id3_buf_size;
143 AVDictionary *id3_initial; /* data from first id3 tag */
144 int id3_found; /* ID3 tag found at some point */
145 int id3_changed; /* ID3 tag data has changed at some point */
146 ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
147
148 int64_t seek_timestamp;
149 int seek_flags;
150 int seek_stream_index; /* into subdemuxer stream array */
151
152 /* Renditions associated with this playlist, if any.
153 * Alternative rendition playlists have a single rendition associated
154 * with them, and variant main Media Playlists may have
155 * multiple (playlist-less) renditions associated with them. */
156 int n_renditions;
157 struct rendition **renditions;
158
159 /* Media Initialization Sections (EXT-X-MAP) associated with this
160 * playlist, if any. */
161 int n_init_sections;
162 struct segment **init_sections;
163 };
164
165 /*
166 * Renditions are e.g. alternative subtitle or audio streams.
167 * The rendition may either be an external playlist or it may be
168 * contained in the main Media Playlist of the variant (in which case
169 * playlist is NULL).
170 */
171 struct rendition {
172 enum AVMediaType type;
173 struct playlist *playlist;
174 char group_id[MAX_FIELD_LEN];
175 char language[MAX_FIELD_LEN];
176 char name[MAX_FIELD_LEN];
177 int disposition;
178 };
179
180 struct variant {
181 int bandwidth;
182
183 /* every variant contains at least the main Media Playlist in index 0 */
184 int n_playlists;
185 struct playlist **playlists;
186
187 char audio_group[MAX_FIELD_LEN];
188 char video_group[MAX_FIELD_LEN];
189 char subtitles_group[MAX_FIELD_LEN];
190 };
191
192 typedef struct HLSContext {
193 AVClass *class;
194 AVFormatContext *ctx;
195 int n_variants;
196 struct variant **variants;
197 int n_playlists;
198 struct playlist **playlists;
199 int n_renditions;
200 struct rendition **renditions;
201
202 int cur_seq_no;
203 int m3u8_hold_counters;
204 int live_start_index;
205 int first_packet;
206 int64_t first_timestamp;
207 int64_t cur_timestamp;
208 AVIOInterruptCB *interrupt_callback;
209 AVDictionary *avio_opts;
210 char *allowed_extensions;
211 int max_reload;
212 int http_persistent;
213 int http_multiple;
214 int http_seekable;
215 AVIOContext *playlist_pb;
216 } HLSContext;
217
free_segment_dynarray(struct segment ** segments,int n_segments)218 static void free_segment_dynarray(struct segment **segments, int n_segments)
219 {
220 int i;
221 for (i = 0; i < n_segments; i++) {
222 av_freep(&segments[i]->key);
223 av_freep(&segments[i]->url);
224 av_freep(&segments[i]);
225 }
226 }
227
free_segment_list(struct playlist * pls)228 static void free_segment_list(struct playlist *pls)
229 {
230 free_segment_dynarray(pls->segments, pls->n_segments);
231 av_freep(&pls->segments);
232 pls->n_segments = 0;
233 }
234
free_init_section_list(struct playlist * pls)235 static void free_init_section_list(struct playlist *pls)
236 {
237 int i;
238 for (i = 0; i < pls->n_init_sections; i++) {
239 av_freep(&pls->init_sections[i]->url);
240 av_freep(&pls->init_sections[i]);
241 }
242 av_freep(&pls->init_sections);
243 pls->n_init_sections = 0;
244 }
245
free_playlist_list(HLSContext * c)246 static void free_playlist_list(HLSContext *c)
247 {
248 int i;
249 for (i = 0; i < c->n_playlists; i++) {
250 struct playlist *pls = c->playlists[i];
251 free_segment_list(pls);
252 free_init_section_list(pls);
253 av_freep(&pls->main_streams);
254 av_freep(&pls->renditions);
255 av_freep(&pls->id3_buf);
256 av_dict_free(&pls->id3_initial);
257 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
258 av_freep(&pls->init_sec_buf);
259 av_packet_unref(&pls->pkt);
260 av_freep(&pls->pb.buffer);
261 ff_format_io_close(c->ctx, &pls->input);
262 pls->input_read_done = 0;
263 ff_format_io_close(c->ctx, &pls->input_next);
264 pls->input_next_requested = 0;
265 if (pls->ctx) {
266 pls->ctx->pb = NULL;
267 avformat_close_input(&pls->ctx);
268 }
269 av_free(pls);
270 }
271 av_freep(&c->playlists);
272 c->n_playlists = 0;
273 }
274
free_variant_list(HLSContext * c)275 static void free_variant_list(HLSContext *c)
276 {
277 int i;
278 for (i = 0; i < c->n_variants; i++) {
279 struct variant *var = c->variants[i];
280 av_freep(&var->playlists);
281 av_free(var);
282 }
283 av_freep(&c->variants);
284 c->n_variants = 0;
285 }
286
free_rendition_list(HLSContext * c)287 static void free_rendition_list(HLSContext *c)
288 {
289 int i;
290 for (i = 0; i < c->n_renditions; i++)
291 av_freep(&c->renditions[i]);
292 av_freep(&c->renditions);
293 c->n_renditions = 0;
294 }
295
296 /*
297 * Used to reset a statically allocated AVPacket to a clean state,
298 * containing no data.
299 */
reset_packet(AVPacket * pkt)300 static void reset_packet(AVPacket *pkt)
301 {
302 av_init_packet(pkt);
303 pkt->data = NULL;
304 }
305
new_playlist(HLSContext * c,const char * url,const char * base)306 static struct playlist *new_playlist(HLSContext *c, const char *url,
307 const char *base)
308 {
309 struct playlist *pls = av_mallocz(sizeof(struct playlist));
310 if (!pls)
311 return NULL;
312 reset_packet(&pls->pkt);
313 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
314 if (!pls->url[0])
315 return NULL;
316 pls->seek_timestamp = AV_NOPTS_VALUE;
317
318 pls->is_id3_timestamped = -1;
319 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
320
321 dynarray_add(&c->playlists, &c->n_playlists, pls);
322 return pls;
323 }
324
325 struct variant_info {
326 char bandwidth[20];
327 /* variant group ids: */
328 char audio[MAX_FIELD_LEN];
329 char video[MAX_FIELD_LEN];
330 char subtitles[MAX_FIELD_LEN];
331 };
332
new_variant(HLSContext * c,struct variant_info * info,const char * url,const char * base)333 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
334 const char *url, const char *base)
335 {
336 struct variant *var;
337 struct playlist *pls;
338
339 pls = new_playlist(c, url, base);
340 if (!pls)
341 return NULL;
342
343 var = av_mallocz(sizeof(struct variant));
344 if (!var)
345 return NULL;
346
347 if (info) {
348 var->bandwidth = atoi(info->bandwidth);
349 strcpy(var->audio_group, info->audio);
350 strcpy(var->video_group, info->video);
351 strcpy(var->subtitles_group, info->subtitles);
352 }
353
354 dynarray_add(&c->variants, &c->n_variants, var);
355 dynarray_add(&var->playlists, &var->n_playlists, pls);
356 return var;
357 }
358
handle_variant_args(struct variant_info * info,const char * key,int key_len,char ** dest,int * dest_len)359 static void handle_variant_args(struct variant_info *info, const char *key,
360 int key_len, char **dest, int *dest_len)
361 {
362 if (!strncmp(key, "BANDWIDTH=", key_len)) {
363 *dest = info->bandwidth;
364 *dest_len = sizeof(info->bandwidth);
365 } else if (!strncmp(key, "AUDIO=", key_len)) {
366 *dest = info->audio;
367 *dest_len = sizeof(info->audio);
368 } else if (!strncmp(key, "VIDEO=", key_len)) {
369 *dest = info->video;
370 *dest_len = sizeof(info->video);
371 } else if (!strncmp(key, "SUBTITLES=", key_len)) {
372 *dest = info->subtitles;
373 *dest_len = sizeof(info->subtitles);
374 }
375 }
376
377 struct key_info {
378 char uri[MAX_URL_SIZE];
379 char method[11];
380 char iv[35];
381 };
382
handle_key_args(struct key_info * info,const char * key,int key_len,char ** dest,int * dest_len)383 static void handle_key_args(struct key_info *info, const char *key,
384 int key_len, char **dest, int *dest_len)
385 {
386 if (!strncmp(key, "METHOD=", key_len)) {
387 *dest = info->method;
388 *dest_len = sizeof(info->method);
389 } else if (!strncmp(key, "URI=", key_len)) {
390 *dest = info->uri;
391 *dest_len = sizeof(info->uri);
392 } else if (!strncmp(key, "IV=", key_len)) {
393 *dest = info->iv;
394 *dest_len = sizeof(info->iv);
395 }
396 }
397
398 struct init_section_info {
399 char uri[MAX_URL_SIZE];
400 char byterange[32];
401 };
402
new_init_section(struct playlist * pls,struct init_section_info * info,const char * url_base)403 static struct segment *new_init_section(struct playlist *pls,
404 struct init_section_info *info,
405 const char *url_base)
406 {
407 struct segment *sec;
408 char tmp_str[MAX_URL_SIZE], *ptr = tmp_str;
409
410 if (!info->uri[0])
411 return NULL;
412
413 sec = av_mallocz(sizeof(*sec));
414 if (!sec)
415 return NULL;
416
417 if (!av_strncasecmp(info->uri, "data:", 5)) {
418 ptr = info->uri;
419 } else {
420 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
421 if (!tmp_str[0]) {
422 av_free(sec);
423 return NULL;
424 }
425 }
426 sec->url = av_strdup(ptr);
427 if (!sec->url) {
428 av_free(sec);
429 return NULL;
430 }
431
432 if (info->byterange[0]) {
433 sec->size = strtoll(info->byterange, NULL, 10);
434 ptr = strchr(info->byterange, '@');
435 if (ptr)
436 sec->url_offset = strtoll(ptr+1, NULL, 10);
437 } else {
438 /* the entire file is the init section */
439 sec->size = -1;
440 }
441
442 dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
443
444 return sec;
445 }
446
handle_init_section_args(struct init_section_info * info,const char * key,int key_len,char ** dest,int * dest_len)447 static void handle_init_section_args(struct init_section_info *info, const char *key,
448 int key_len, char **dest, int *dest_len)
449 {
450 if (!strncmp(key, "URI=", key_len)) {
451 *dest = info->uri;
452 *dest_len = sizeof(info->uri);
453 } else if (!strncmp(key, "BYTERANGE=", key_len)) {
454 *dest = info->byterange;
455 *dest_len = sizeof(info->byterange);
456 }
457 }
458
459 struct rendition_info {
460 char type[16];
461 char uri[MAX_URL_SIZE];
462 char group_id[MAX_FIELD_LEN];
463 char language[MAX_FIELD_LEN];
464 char assoc_language[MAX_FIELD_LEN];
465 char name[MAX_FIELD_LEN];
466 char defaultr[4];
467 char forced[4];
468 char characteristics[MAX_CHARACTERISTICS_LEN];
469 };
470
new_rendition(HLSContext * c,struct rendition_info * info,const char * url_base)471 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
472 const char *url_base)
473 {
474 struct rendition *rend;
475 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
476 char *characteristic;
477 char *chr_ptr;
478 char *saveptr;
479
480 if (!strcmp(info->type, "AUDIO"))
481 type = AVMEDIA_TYPE_AUDIO;
482 else if (!strcmp(info->type, "VIDEO"))
483 type = AVMEDIA_TYPE_VIDEO;
484 else if (!strcmp(info->type, "SUBTITLES"))
485 type = AVMEDIA_TYPE_SUBTITLE;
486 else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
487 /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
488 * AVC SEI RBSP anyway */
489 return NULL;
490
491 if (type == AVMEDIA_TYPE_UNKNOWN) {
492 av_log(c->ctx, AV_LOG_WARNING, "Can't support the type: %s\n", info->type);
493 return NULL;
494 }
495
496 /* URI is mandatory for subtitles as per spec */
497 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) {
498 av_log(c->ctx, AV_LOG_ERROR, "The URI tag is REQUIRED for subtitle.\n");
499 return NULL;
500 }
501
502 /* TODO: handle subtitles (each segment has to parsed separately) */
503 if (c->ctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
504 if (type == AVMEDIA_TYPE_SUBTITLE) {
505 av_log(c->ctx, AV_LOG_WARNING, "Can't support the subtitle(uri: %s)\n", info->uri);
506 return NULL;
507 }
508
509 rend = av_mallocz(sizeof(struct rendition));
510 if (!rend)
511 return NULL;
512
513 dynarray_add(&c->renditions, &c->n_renditions, rend);
514
515 rend->type = type;
516 strcpy(rend->group_id, info->group_id);
517 strcpy(rend->language, info->language);
518 strcpy(rend->name, info->name);
519
520 /* add the playlist if this is an external rendition */
521 if (info->uri[0]) {
522 rend->playlist = new_playlist(c, info->uri, url_base);
523 if (rend->playlist)
524 dynarray_add(&rend->playlist->renditions,
525 &rend->playlist->n_renditions, rend);
526 }
527
528 if (info->assoc_language[0]) {
529 int langlen = strlen(rend->language);
530 if (langlen < sizeof(rend->language) - 3) {
531 rend->language[langlen] = ',';
532 strncpy(rend->language + langlen + 1, info->assoc_language,
533 sizeof(rend->language) - langlen - 2);
534 }
535 }
536
537 if (!strcmp(info->defaultr, "YES"))
538 rend->disposition |= AV_DISPOSITION_DEFAULT;
539 if (!strcmp(info->forced, "YES"))
540 rend->disposition |= AV_DISPOSITION_FORCED;
541
542 chr_ptr = info->characteristics;
543 while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
544 if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
545 rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
546 else if (!strcmp(characteristic, "public.accessibility.describes-video"))
547 rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
548
549 chr_ptr = NULL;
550 }
551
552 return rend;
553 }
554
handle_rendition_args(struct rendition_info * info,const char * key,int key_len,char ** dest,int * dest_len)555 static void handle_rendition_args(struct rendition_info *info, const char *key,
556 int key_len, char **dest, int *dest_len)
557 {
558 if (!strncmp(key, "TYPE=", key_len)) {
559 *dest = info->type;
560 *dest_len = sizeof(info->type);
561 } else if (!strncmp(key, "URI=", key_len)) {
562 *dest = info->uri;
563 *dest_len = sizeof(info->uri);
564 } else if (!strncmp(key, "GROUP-ID=", key_len)) {
565 *dest = info->group_id;
566 *dest_len = sizeof(info->group_id);
567 } else if (!strncmp(key, "LANGUAGE=", key_len)) {
568 *dest = info->language;
569 *dest_len = sizeof(info->language);
570 } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
571 *dest = info->assoc_language;
572 *dest_len = sizeof(info->assoc_language);
573 } else if (!strncmp(key, "NAME=", key_len)) {
574 *dest = info->name;
575 *dest_len = sizeof(info->name);
576 } else if (!strncmp(key, "DEFAULT=", key_len)) {
577 *dest = info->defaultr;
578 *dest_len = sizeof(info->defaultr);
579 } else if (!strncmp(key, "FORCED=", key_len)) {
580 *dest = info->forced;
581 *dest_len = sizeof(info->forced);
582 } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
583 *dest = info->characteristics;
584 *dest_len = sizeof(info->characteristics);
585 }
586 /*
587 * ignored:
588 * - AUTOSELECT: client may autoselect based on e.g. system language
589 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
590 */
591 }
592
593 /* used by parse_playlist to allocate a new variant+playlist when the
594 * playlist is detected to be a Media Playlist (not Master Playlist)
595 * and we have no parent Master Playlist (parsing of which would have
596 * allocated the variant and playlist already)
597 * *pls == NULL => Master Playlist or parentless Media Playlist
598 * *pls != NULL => parented Media Playlist, playlist+variant allocated */
ensure_playlist(HLSContext * c,struct playlist ** pls,const char * url)599 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
600 {
601 if (*pls)
602 return 0;
603 if (!new_variant(c, NULL, url, NULL))
604 return AVERROR(ENOMEM);
605 *pls = c->playlists[c->n_playlists - 1];
606 return 0;
607 }
608
open_url_keepalive(AVFormatContext * s,AVIOContext ** pb,const char * url,AVDictionary ** options)609 static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb,
610 const char *url, AVDictionary **options)
611 {
612 #if !CONFIG_HTTP_PROTOCOL
613 return AVERROR_PROTOCOL_NOT_FOUND;
614 #else
615 int ret;
616 URLContext *uc = ffio_geturlcontext(*pb);
617 av_assert0(uc);
618 (*pb)->eof_reached = 0;
619 ret = ff_http_do_new_request2(uc, url, options);
620 if (ret < 0) {
621 ff_format_io_close(s, pb);
622 }
623 return ret;
624 #endif
625 }
626
open_url(AVFormatContext * s,AVIOContext ** pb,const char * url,AVDictionary * opts,AVDictionary * opts2,int * is_http_out)627 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
628 AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
629 {
630 HLSContext *c = s->priv_data;
631 AVDictionary *tmp = NULL;
632 const char *proto_name = NULL;
633 int ret;
634 int is_http = 0;
635
636 if (av_strstart(url, "crypto", NULL)) {
637 if (url[6] == '+' || url[6] == ':')
638 proto_name = avio_find_protocol_name(url + 7);
639 } else if (av_strstart(url, "data", NULL)) {
640 if (url[4] == '+' || url[4] == ':')
641 proto_name = avio_find_protocol_name(url + 5);
642 }
643
644 if (!proto_name)
645 proto_name = avio_find_protocol_name(url);
646
647 if (!proto_name)
648 return AVERROR_INVALIDDATA;
649
650 // only http(s) & file are allowed
651 if (av_strstart(proto_name, "file", NULL)) {
652 if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
653 av_log(s, AV_LOG_ERROR,
654 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
655 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
656 url);
657 return AVERROR_INVALIDDATA;
658 }
659 } else if (av_strstart(proto_name, "http", NULL)) {
660 is_http = 1;
661 } else if (av_strstart(proto_name, "data", NULL)) {
662 ;
663 } else
664 return AVERROR_INVALIDDATA;
665
666 if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
667 ;
668 else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
669 ;
670 else if (av_strstart(url, "data", NULL) && !strncmp(proto_name, url + 5, strlen(proto_name)) && url[5 + strlen(proto_name)] == ':')
671 ;
672 else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
673 return AVERROR_INVALIDDATA;
674
675 av_dict_copy(&tmp, opts, 0);
676 av_dict_copy(&tmp, opts2, 0);
677
678 if (is_http && c->http_persistent && *pb) {
679 ret = open_url_keepalive(c->ctx, pb, url, &tmp);
680 if (ret == AVERROR_EXIT) {
681 av_dict_free(&tmp);
682 return ret;
683 } else if (ret < 0) {
684 if (ret != AVERROR_EOF)
685 av_log(s, AV_LOG_WARNING,
686 "keepalive request failed for '%s' with error: '%s' when opening url, retrying with new connection\n",
687 url, av_err2str(ret));
688 ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
689 }
690 } else {
691 ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
692 }
693 if (ret >= 0) {
694 // update cookies on http response with setcookies.
695 char *new_cookies = NULL;
696
697 if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
698 av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
699
700 if (new_cookies)
701 av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
702 }
703
704 av_dict_free(&tmp);
705
706 if (is_http_out)
707 *is_http_out = is_http;
708
709 return ret;
710 }
711
parse_playlist(HLSContext * c,const char * url,struct playlist * pls,AVIOContext * in)712 static int parse_playlist(HLSContext *c, const char *url,
713 struct playlist *pls, AVIOContext *in)
714 {
715 int ret = 0, is_segment = 0, is_variant = 0;
716 int64_t duration = 0;
717 enum KeyType key_type = KEY_NONE;
718 uint8_t iv[16] = "";
719 int has_iv = 0;
720 char key[MAX_URL_SIZE] = "";
721 char line[MAX_URL_SIZE];
722 const char *ptr;
723 int close_in = 0;
724 int64_t seg_offset = 0;
725 int64_t seg_size = -1;
726 uint8_t *new_url = NULL;
727 struct variant_info variant_info;
728 char tmp_str[MAX_URL_SIZE];
729 struct segment *cur_init_section = NULL;
730 int is_http = av_strstart(url, "http", NULL);
731 struct segment **prev_segments = NULL;
732 int prev_n_segments = 0;
733 int prev_start_seq_no = -1;
734
735 if (is_http && !in && c->http_persistent && c->playlist_pb) {
736 in = c->playlist_pb;
737 ret = open_url_keepalive(c->ctx, &c->playlist_pb, url, NULL);
738 if (ret == AVERROR_EXIT) {
739 return ret;
740 } else if (ret < 0) {
741 if (ret != AVERROR_EOF)
742 av_log(c->ctx, AV_LOG_WARNING,
743 "keepalive request failed for '%s' with error: '%s' when parsing playlist\n",
744 url, av_err2str(ret));
745 in = NULL;
746 }
747 }
748
749 if (!in) {
750 AVDictionary *opts = NULL;
751 av_dict_copy(&opts, c->avio_opts, 0);
752
753 if (c->http_persistent)
754 av_dict_set(&opts, "multiple_requests", "1", 0);
755
756 ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
757 av_dict_free(&opts);
758 if (ret < 0)
759 return ret;
760
761 if (is_http && c->http_persistent)
762 c->playlist_pb = in;
763 else
764 close_in = 1;
765 }
766
767 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
768 url = new_url;
769
770 ff_get_chomp_line(in, line, sizeof(line));
771 if (strcmp(line, "#EXTM3U")) {
772 ret = AVERROR_INVALIDDATA;
773 goto fail;
774 }
775
776 if (pls) {
777 prev_start_seq_no = pls->start_seq_no;
778 prev_segments = pls->segments;
779 prev_n_segments = pls->n_segments;
780 pls->segments = NULL;
781 pls->n_segments = 0;
782
783 pls->finished = 0;
784 pls->type = PLS_TYPE_UNSPECIFIED;
785 }
786 while (!avio_feof(in)) {
787 ff_get_chomp_line(in, line, sizeof(line));
788 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
789 is_variant = 1;
790 memset(&variant_info, 0, sizeof(variant_info));
791 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
792 &variant_info);
793 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
794 struct key_info info = {{0}};
795 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
796 &info);
797 key_type = KEY_NONE;
798 has_iv = 0;
799 if (!strcmp(info.method, "AES-128"))
800 key_type = KEY_AES_128;
801 if (!strcmp(info.method, "SAMPLE-AES"))
802 key_type = KEY_SAMPLE_AES;
803 if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
804 ff_hex_to_data(iv, info.iv + 2);
805 has_iv = 1;
806 }
807 av_strlcpy(key, info.uri, sizeof(key));
808 } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
809 struct rendition_info info = {{0}};
810 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
811 &info);
812 new_rendition(c, &info, url);
813 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
814 ret = ensure_playlist(c, &pls, url);
815 if (ret < 0)
816 goto fail;
817 pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
818 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
819 ret = ensure_playlist(c, &pls, url);
820 if (ret < 0)
821 goto fail;
822 pls->start_seq_no = atoi(ptr);
823 } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
824 ret = ensure_playlist(c, &pls, url);
825 if (ret < 0)
826 goto fail;
827 if (!strcmp(ptr, "EVENT"))
828 pls->type = PLS_TYPE_EVENT;
829 else if (!strcmp(ptr, "VOD"))
830 pls->type = PLS_TYPE_VOD;
831 } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
832 struct init_section_info info = {{0}};
833 ret = ensure_playlist(c, &pls, url);
834 if (ret < 0)
835 goto fail;
836 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
837 &info);
838 cur_init_section = new_init_section(pls, &info, url);
839 cur_init_section->key_type = key_type;
840 if (has_iv) {
841 memcpy(cur_init_section->iv, iv, sizeof(iv));
842 } else {
843 int seq = pls->start_seq_no + pls->n_segments;
844 memset(cur_init_section->iv, 0, sizeof(cur_init_section->iv));
845 AV_WB32(cur_init_section->iv + 12, seq);
846 }
847
848 if (key_type != KEY_NONE) {
849 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
850 if (!tmp_str[0]) {
851 av_free(cur_init_section);
852 ret = AVERROR_INVALIDDATA;
853 goto fail;
854 }
855 cur_init_section->key = av_strdup(tmp_str);
856 if (!cur_init_section->key) {
857 av_free(cur_init_section);
858 ret = AVERROR(ENOMEM);
859 goto fail;
860 }
861 } else {
862 cur_init_section->key = NULL;
863 }
864
865 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
866 if (pls)
867 pls->finished = 1;
868 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
869 is_segment = 1;
870 duration = atof(ptr) * AV_TIME_BASE;
871 } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
872 seg_size = strtoll(ptr, NULL, 10);
873 ptr = strchr(ptr, '@');
874 if (ptr)
875 seg_offset = strtoll(ptr+1, NULL, 10);
876 } else if (av_strstart(line, "#", NULL)) {
877 av_log(c->ctx, AV_LOG_INFO, "Skip ('%s')\n", line);
878 continue;
879 } else if (line[0]) {
880 if (is_variant) {
881 if (!new_variant(c, &variant_info, line, url)) {
882 ret = AVERROR(ENOMEM);
883 goto fail;
884 }
885 is_variant = 0;
886 }
887 if (is_segment) {
888 struct segment *seg;
889 ret = ensure_playlist(c, &pls, url);
890 if (ret < 0)
891 goto fail;
892 seg = av_malloc(sizeof(struct segment));
893 if (!seg) {
894 ret = AVERROR(ENOMEM);
895 goto fail;
896 }
897 if (has_iv) {
898 memcpy(seg->iv, iv, sizeof(iv));
899 } else {
900 int seq = pls->start_seq_no + pls->n_segments;
901 memset(seg->iv, 0, sizeof(seg->iv));
902 AV_WB32(seg->iv + 12, seq);
903 }
904
905 if (key_type != KEY_NONE) {
906 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
907 if (!tmp_str[0]) {
908 ret = AVERROR_INVALIDDATA;
909 av_free(seg);
910 goto fail;
911 }
912 seg->key = av_strdup(tmp_str);
913 if (!seg->key) {
914 av_free(seg);
915 ret = AVERROR(ENOMEM);
916 goto fail;
917 }
918 } else {
919 seg->key = NULL;
920 }
921
922 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
923 if (!tmp_str[0]) {
924 ret = AVERROR_INVALIDDATA;
925 if (seg->key)
926 av_free(seg->key);
927 av_free(seg);
928 goto fail;
929 }
930 seg->url = av_strdup(tmp_str);
931 if (!seg->url) {
932 av_free(seg->key);
933 av_free(seg);
934 ret = AVERROR(ENOMEM);
935 goto fail;
936 }
937
938 if (duration < 0.001 * AV_TIME_BASE) {
939 av_log(c->ctx, AV_LOG_WARNING, "Cannot get correct #EXTINF value of segment %s,"
940 " set to default value to 1ms.\n", seg->url);
941 duration = 0.001 * AV_TIME_BASE;
942 }
943 seg->duration = duration;
944 seg->key_type = key_type;
945 dynarray_add(&pls->segments, &pls->n_segments, seg);
946 is_segment = 0;
947
948 seg->size = seg_size;
949 if (seg_size >= 0) {
950 seg->url_offset = seg_offset;
951 seg_offset += seg_size;
952 seg_size = -1;
953 } else {
954 seg->url_offset = 0;
955 seg_offset = 0;
956 }
957
958 seg->init_section = cur_init_section;
959 }
960 }
961 }
962 if (prev_segments) {
963 if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
964 int64_t prev_timestamp = c->first_timestamp;
965 int i, diff = pls->start_seq_no - prev_start_seq_no;
966 for (i = 0; i < prev_n_segments && i < diff; i++) {
967 c->first_timestamp += prev_segments[i]->duration;
968 }
969 av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%d -> %d)"
970 " reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
971 prev_start_seq_no, pls->start_seq_no,
972 prev_timestamp, c->first_timestamp);
973 } else if (pls->start_seq_no < prev_start_seq_no) {
974 av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %d -> %d\n",
975 prev_start_seq_no, pls->start_seq_no);
976 }
977 free_segment_dynarray(prev_segments, prev_n_segments);
978 av_freep(&prev_segments);
979 }
980 if (pls)
981 pls->last_load_time = av_gettime_relative();
982
983 fail:
984 av_free(new_url);
985 if (close_in)
986 ff_format_io_close(c->ctx, &in);
987 c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
988 if (!c->n_variants || !c->variants[0]->n_playlists ||
989 !(c->variants[0]->playlists[0]->finished ||
990 c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
991 c->ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
992 return ret;
993 }
994
current_segment(struct playlist * pls)995 static struct segment *current_segment(struct playlist *pls)
996 {
997 return pls->segments[pls->cur_seq_no - pls->start_seq_no];
998 }
999
next_segment(struct playlist * pls)1000 static struct segment *next_segment(struct playlist *pls)
1001 {
1002 int n = pls->cur_seq_no - pls->start_seq_no + 1;
1003 if (n >= pls->n_segments)
1004 return NULL;
1005 return pls->segments[n];
1006 }
1007
read_from_url(struct playlist * pls,struct segment * seg,uint8_t * buf,int buf_size)1008 static int read_from_url(struct playlist *pls, struct segment *seg,
1009 uint8_t *buf, int buf_size)
1010 {
1011 int ret;
1012
1013 /* limit read if the segment was only a part of a file */
1014 if (seg->size >= 0)
1015 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
1016
1017 ret = avio_read(pls->input, buf, buf_size);
1018 if (ret > 0)
1019 pls->cur_seg_offset += ret;
1020
1021 return ret;
1022 }
1023
1024 /* Parse the raw ID3 data and pass contents to caller */
parse_id3(AVFormatContext * s,AVIOContext * pb,AVDictionary ** metadata,int64_t * dts,ID3v2ExtraMetaAPIC ** apic,ID3v2ExtraMeta ** extra_meta)1025 static void parse_id3(AVFormatContext *s, AVIOContext *pb,
1026 AVDictionary **metadata, int64_t *dts,
1027 ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
1028 {
1029 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
1030 ID3v2ExtraMeta *meta;
1031
1032 ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
1033 for (meta = *extra_meta; meta; meta = meta->next) {
1034 if (!strcmp(meta->tag, "PRIV")) {
1035 ID3v2ExtraMetaPRIV *priv = &meta->data.priv;
1036 if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
1037 /* 33-bit MPEG timestamp */
1038 int64_t ts = AV_RB64(priv->data);
1039 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
1040 if ((ts & ~((1ULL << 33) - 1)) == 0)
1041 *dts = ts;
1042 else
1043 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
1044 }
1045 } else if (!strcmp(meta->tag, "APIC") && apic)
1046 *apic = &meta->data.apic;
1047 }
1048 }
1049
1050 /* Check if the ID3 metadata contents have changed */
id3_has_changed_values(struct playlist * pls,AVDictionary * metadata,ID3v2ExtraMetaAPIC * apic)1051 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
1052 ID3v2ExtraMetaAPIC *apic)
1053 {
1054 AVDictionaryEntry *entry = NULL;
1055 AVDictionaryEntry *oldentry;
1056 /* check that no keys have changed values */
1057 while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
1058 oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
1059 if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
1060 return 1;
1061 }
1062
1063 /* check if apic appeared */
1064 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
1065 return 1;
1066
1067 if (apic) {
1068 int size = pls->ctx->streams[1]->attached_pic.size;
1069 if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
1070 return 1;
1071
1072 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
1073 return 1;
1074 }
1075
1076 return 0;
1077 }
1078
1079 /* Parse ID3 data and handle the found data */
handle_id3(AVIOContext * pb,struct playlist * pls)1080 static void handle_id3(AVIOContext *pb, struct playlist *pls)
1081 {
1082 AVDictionary *metadata = NULL;
1083 ID3v2ExtraMetaAPIC *apic = NULL;
1084 ID3v2ExtraMeta *extra_meta = NULL;
1085 int64_t timestamp = AV_NOPTS_VALUE;
1086
1087 parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta);
1088
1089 if (timestamp != AV_NOPTS_VALUE) {
1090 pls->id3_mpegts_timestamp = timestamp;
1091 pls->id3_offset = 0;
1092 }
1093
1094 if (!pls->id3_found) {
1095 /* initial ID3 tags */
1096 av_assert0(!pls->id3_deferred_extra);
1097 pls->id3_found = 1;
1098
1099 /* get picture attachment and set text metadata */
1100 if (pls->ctx->nb_streams)
1101 ff_id3v2_parse_apic(pls->ctx, extra_meta);
1102 else
1103 /* demuxer not yet opened, defer picture attachment */
1104 pls->id3_deferred_extra = extra_meta;
1105
1106 ff_id3v2_parse_priv_dict(&metadata, extra_meta);
1107 av_dict_copy(&pls->ctx->metadata, metadata, 0);
1108 pls->id3_initial = metadata;
1109
1110 } else {
1111 if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
1112 avpriv_report_missing_feature(pls->parent, "Changing ID3 metadata in HLS audio elementary stream");
1113 pls->id3_changed = 1;
1114 }
1115 av_dict_free(&metadata);
1116 }
1117
1118 if (!pls->id3_deferred_extra)
1119 ff_id3v2_free_extra_meta(&extra_meta);
1120 }
1121
intercept_id3(struct playlist * pls,uint8_t * buf,int buf_size,int * len)1122 static void intercept_id3(struct playlist *pls, uint8_t *buf,
1123 int buf_size, int *len)
1124 {
1125 /* intercept id3 tags, we do not want to pass them to the raw
1126 * demuxer on all segment switches */
1127 int bytes;
1128 int id3_buf_pos = 0;
1129 int fill_buf = 0;
1130 struct segment *seg = current_segment(pls);
1131
1132 /* gather all the id3 tags */
1133 while (1) {
1134 /* see if we can retrieve enough data for ID3 header */
1135 if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
1136 bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
1137 if (bytes > 0) {
1138
1139 if (bytes == ID3v2_HEADER_SIZE - *len)
1140 /* no EOF yet, so fill the caller buffer again after
1141 * we have stripped the ID3 tags */
1142 fill_buf = 1;
1143
1144 *len += bytes;
1145
1146 } else if (*len <= 0) {
1147 /* error/EOF */
1148 *len = bytes;
1149 fill_buf = 0;
1150 }
1151 }
1152
1153 if (*len < ID3v2_HEADER_SIZE)
1154 break;
1155
1156 if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
1157 int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
1158 int taglen = ff_id3v2_tag_len(buf);
1159 int tag_got_bytes = FFMIN(taglen, *len);
1160 int remaining = taglen - tag_got_bytes;
1161
1162 if (taglen > maxsize) {
1163 av_log(pls->parent, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
1164 taglen, maxsize);
1165 break;
1166 }
1167
1168 /*
1169 * Copy the id3 tag to our temporary id3 buffer.
1170 * We could read a small id3 tag directly without memcpy, but
1171 * we would still need to copy the large tags, and handling
1172 * both of those cases together with the possibility for multiple
1173 * tags would make the handling a bit complex.
1174 */
1175 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
1176 if (!pls->id3_buf)
1177 break;
1178 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
1179 id3_buf_pos += tag_got_bytes;
1180
1181 /* strip the intercepted bytes */
1182 *len -= tag_got_bytes;
1183 memmove(buf, buf + tag_got_bytes, *len);
1184 av_log(pls->parent, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
1185
1186 if (remaining > 0) {
1187 /* read the rest of the tag in */
1188 if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
1189 break;
1190 id3_buf_pos += remaining;
1191 av_log(pls->parent, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
1192 }
1193
1194 } else {
1195 /* no more ID3 tags */
1196 break;
1197 }
1198 }
1199
1200 /* re-fill buffer for the caller unless EOF */
1201 if (*len >= 0 && (fill_buf || *len == 0)) {
1202 bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
1203
1204 /* ignore error if we already had some data */
1205 if (bytes >= 0)
1206 *len += bytes;
1207 else if (*len == 0)
1208 *len = bytes;
1209 }
1210
1211 if (pls->id3_buf) {
1212 /* Now parse all the ID3 tags */
1213 AVIOContext id3ioctx;
1214 ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
1215 handle_id3(&id3ioctx, pls);
1216 }
1217
1218 if (pls->is_id3_timestamped == -1)
1219 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
1220 }
1221
open_input(HLSContext * c,struct playlist * pls,struct segment * seg,AVIOContext ** in)1222 static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
1223 {
1224 AVDictionary *opts = NULL;
1225 int ret;
1226 int is_http = 0;
1227
1228 if (c->http_persistent)
1229 av_dict_set(&opts, "multiple_requests", "1", 0);
1230
1231 if (seg->size >= 0) {
1232 /* try to restrict the HTTP request to the part we want
1233 * (if this is in fact a HTTP request) */
1234 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1235 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1236 }
1237
1238 av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
1239 seg->url, seg->url_offset, pls->index);
1240
1241 if (seg->key_type == KEY_NONE) {
1242 ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
1243 } else if (seg->key_type == KEY_AES_128) {
1244 char iv[33], key[33], url[MAX_URL_SIZE];
1245 if (strcmp(seg->key, pls->key_url)) {
1246 AVIOContext *pb = NULL;
1247 if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
1248 ret = avio_read(pb, pls->key, sizeof(pls->key));
1249 if (ret != sizeof(pls->key)) {
1250 av_log(pls->parent, AV_LOG_ERROR, "Unable to read key file %s\n",
1251 seg->key);
1252 }
1253 ff_format_io_close(pls->parent, &pb);
1254 } else {
1255 av_log(pls->parent, AV_LOG_ERROR, "Unable to open key file %s\n",
1256 seg->key);
1257 }
1258 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
1259 }
1260 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
1261 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
1262 iv[32] = key[32] = '\0';
1263 if (strstr(seg->url, "://"))
1264 snprintf(url, sizeof(url), "crypto+%s", seg->url);
1265 else
1266 snprintf(url, sizeof(url), "crypto:%s", seg->url);
1267
1268 av_dict_set(&opts, "key", key, 0);
1269 av_dict_set(&opts, "iv", iv, 0);
1270
1271 ret = open_url(pls->parent, in, url, c->avio_opts, opts, &is_http);
1272 if (ret < 0) {
1273 goto cleanup;
1274 }
1275 ret = 0;
1276 } else if (seg->key_type == KEY_SAMPLE_AES) {
1277 av_log(pls->parent, AV_LOG_ERROR,
1278 "SAMPLE-AES encryption is not supported yet\n");
1279 ret = AVERROR_PATCHWELCOME;
1280 }
1281 else
1282 ret = AVERROR(ENOSYS);
1283
1284 /* Seek to the requested position. If this was a HTTP request, the offset
1285 * should already be where want it to, but this allows e.g. local testing
1286 * without a HTTP server.
1287 *
1288 * This is not done for HTTP at all as avio_seek() does internal bookkeeping
1289 * of file offset which is out-of-sync with the actual offset when "offset"
1290 * AVOption is used with http protocol, causing the seek to not be a no-op
1291 * as would be expected. Wrong offset received from the server will not be
1292 * noticed without the call, though.
1293 */
1294 if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
1295 int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
1296 if (seekret < 0) {
1297 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
1298 ret = seekret;
1299 ff_format_io_close(pls->parent, in);
1300 }
1301 }
1302
1303 cleanup:
1304 av_dict_free(&opts);
1305 pls->cur_seg_offset = 0;
1306 return ret;
1307 }
1308
update_init_section(struct playlist * pls,struct segment * seg)1309 static int update_init_section(struct playlist *pls, struct segment *seg)
1310 {
1311 static const int max_init_section_size = 1024*1024;
1312 HLSContext *c = pls->parent->priv_data;
1313 int64_t sec_size;
1314 int64_t urlsize;
1315 int ret;
1316
1317 if (seg->init_section == pls->cur_init_section)
1318 return 0;
1319
1320 pls->cur_init_section = NULL;
1321
1322 if (!seg->init_section)
1323 return 0;
1324
1325 ret = open_input(c, pls, seg->init_section, &pls->input);
1326 if (ret < 0) {
1327 av_log(pls->parent, AV_LOG_WARNING,
1328 "Failed to open an initialization section in playlist %d\n",
1329 pls->index);
1330 return ret;
1331 }
1332
1333 if (seg->init_section->size >= 0)
1334 sec_size = seg->init_section->size;
1335 else if ((urlsize = avio_size(pls->input)) >= 0)
1336 sec_size = urlsize;
1337 else
1338 sec_size = max_init_section_size;
1339
1340 av_log(pls->parent, AV_LOG_DEBUG,
1341 "Downloading an initialization section of size %"PRId64"\n",
1342 sec_size);
1343
1344 sec_size = FFMIN(sec_size, max_init_section_size);
1345
1346 av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1347
1348 ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
1349 pls->init_sec_buf_size);
1350 ff_format_io_close(pls->parent, &pls->input);
1351
1352 if (ret < 0)
1353 return ret;
1354
1355 pls->cur_init_section = seg->init_section;
1356 pls->init_sec_data_len = ret;
1357 pls->init_sec_buf_read_offset = 0;
1358
1359 /* spec says audio elementary streams do not have media initialization
1360 * sections, so there should be no ID3 timestamps */
1361 pls->is_id3_timestamped = 0;
1362
1363 return 0;
1364 }
1365
default_reload_interval(struct playlist * pls)1366 static int64_t default_reload_interval(struct playlist *pls)
1367 {
1368 return pls->n_segments > 0 ?
1369 pls->segments[pls->n_segments - 1]->duration :
1370 pls->target_duration;
1371 }
1372
playlist_needed(struct playlist * pls)1373 static int playlist_needed(struct playlist *pls)
1374 {
1375 AVFormatContext *s = pls->parent;
1376 int i, j;
1377 int stream_needed = 0;
1378 int first_st;
1379
1380 /* If there is no context or streams yet, the playlist is needed */
1381 if (!pls->ctx || !pls->n_main_streams)
1382 return 1;
1383
1384 /* check if any of the streams in the playlist are needed */
1385 for (i = 0; i < pls->n_main_streams; i++) {
1386 if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
1387 stream_needed = 1;
1388 break;
1389 }
1390 }
1391
1392 /* If all streams in the playlist were discarded, the playlist is not
1393 * needed (regardless of whether whole programs are discarded or not). */
1394 if (!stream_needed)
1395 return 0;
1396
1397 /* Otherwise, check if all the programs (variants) this playlist is in are
1398 * discarded. Since all streams in the playlist are part of the same programs
1399 * we can just check the programs of the first stream. */
1400
1401 first_st = pls->main_streams[0]->index;
1402
1403 for (i = 0; i < s->nb_programs; i++) {
1404 AVProgram *program = s->programs[i];
1405 if (program->discard < AVDISCARD_ALL) {
1406 for (j = 0; j < program->nb_stream_indexes; j++) {
1407 if (program->stream_index[j] == first_st) {
1408 /* playlist is in an undiscarded program */
1409 return 1;
1410 }
1411 }
1412 }
1413 }
1414
1415 /* some streams were not discarded but all the programs were */
1416 return 0;
1417 }
1418
read_data(void * opaque,uint8_t * buf,int buf_size)1419 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1420 {
1421 struct playlist *v = opaque;
1422 HLSContext *c = v->parent->priv_data;
1423 int ret;
1424 int just_opened = 0;
1425 int reload_count = 0;
1426 struct segment *seg;
1427
1428 restart:
1429 if (!v->needed)
1430 return AVERROR_EOF;
1431
1432 if (!v->input || (c->http_persistent && v->input_read_done)) {
1433 int64_t reload_interval;
1434
1435 /* Check that the playlist is still needed before opening a new
1436 * segment. */
1437 v->needed = playlist_needed(v);
1438
1439 if (!v->needed) {
1440 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
1441 v->index, v->url);
1442 return AVERROR_EOF;
1443 }
1444
1445 /* If this is a live stream and the reload interval has elapsed since
1446 * the last playlist reload, reload the playlists now. */
1447 reload_interval = default_reload_interval(v);
1448
1449 reload:
1450 reload_count++;
1451 if (reload_count > c->max_reload)
1452 return AVERROR_EOF;
1453 if (!v->finished &&
1454 av_gettime_relative() - v->last_load_time >= reload_interval) {
1455 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1456 if (ret != AVERROR_EXIT)
1457 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1458 v->index);
1459 return ret;
1460 }
1461 /* If we need to reload the playlist again below (if
1462 * there's still no more segments), switch to a reload
1463 * interval of half the target duration. */
1464 reload_interval = v->target_duration / 2;
1465 }
1466 if (v->cur_seq_no < v->start_seq_no) {
1467 av_log(v->parent, AV_LOG_WARNING,
1468 "skipping %d segments ahead, expired from playlists\n",
1469 v->start_seq_no - v->cur_seq_no);
1470 v->cur_seq_no = v->start_seq_no;
1471 }
1472 if (v->cur_seq_no > v->last_seq_no) {
1473 v->last_seq_no = v->cur_seq_no;
1474 v->m3u8_hold_counters = 0;
1475 } else if (v->last_seq_no == v->cur_seq_no) {
1476 v->m3u8_hold_counters++;
1477 if (v->m3u8_hold_counters >= c->m3u8_hold_counters) {
1478 return AVERROR_EOF;
1479 }
1480 } else {
1481 av_log(v->parent, AV_LOG_WARNING, "maybe the m3u8 list sequence have been wraped.\n");
1482 }
1483 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1484 if (v->finished)
1485 return AVERROR_EOF;
1486 while (av_gettime_relative() - v->last_load_time < reload_interval) {
1487 if (ff_check_interrupt(c->interrupt_callback))
1488 return AVERROR_EXIT;
1489 av_usleep(100*1000);
1490 }
1491 /* Enough time has elapsed since the last reload */
1492 goto reload;
1493 }
1494
1495 v->input_read_done = 0;
1496 seg = current_segment(v);
1497
1498 /* load/update Media Initialization Section, if any */
1499 ret = update_init_section(v, seg);
1500 if (ret)
1501 return ret;
1502
1503 if (c->http_multiple == 1 && v->input_next_requested) {
1504 FFSWAP(AVIOContext *, v->input, v->input_next);
1505 v->cur_seg_offset = 0;
1506 v->input_next_requested = 0;
1507 ret = 0;
1508 } else {
1509 ret = open_input(c, v, seg, &v->input);
1510 }
1511 if (ret < 0) {
1512 if (ff_check_interrupt(c->interrupt_callback))
1513 return AVERROR_EXIT;
1514 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
1515 v->cur_seq_no,
1516 v->index);
1517 v->cur_seq_no += 1;
1518 goto reload;
1519 }
1520 just_opened = 1;
1521 }
1522
1523 if (c->http_multiple == -1) {
1524 uint8_t *http_version_opt = NULL;
1525 int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
1526 if (r >= 0) {
1527 c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
1528 av_freep(&http_version_opt);
1529 }
1530 }
1531
1532 seg = next_segment(v);
1533 if (c->http_multiple == 1 && !v->input_next_requested &&
1534 seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1535 ret = open_input(c, v, seg, &v->input_next);
1536 if (ret < 0) {
1537 if (ff_check_interrupt(c->interrupt_callback))
1538 return AVERROR_EXIT;
1539 av_log(v->parent, AV_LOG_WARNING, "Failed to open next segment %d of playlist %d\n",
1540 v->cur_seq_no + 1,
1541 v->index);
1542 } else {
1543 v->input_next_requested = 1;
1544 }
1545 }
1546
1547 if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
1548 /* Push init section out first before first actual segment */
1549 int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1550 memcpy(buf, v->init_sec_buf, copy_size);
1551 v->init_sec_buf_read_offset += copy_size;
1552 return copy_size;
1553 }
1554
1555 seg = current_segment(v);
1556 ret = read_from_url(v, seg, buf, buf_size);
1557 if (ret > 0) {
1558 if (just_opened && v->is_id3_timestamped != 0) {
1559 /* Intercept ID3 tags here, elementary audio streams are required
1560 * to convey timestamps using them in the beginning of each segment. */
1561 intercept_id3(v, buf, buf_size, &ret);
1562 }
1563
1564 return ret;
1565 }
1566 if (c->http_persistent &&
1567 seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1568 v->input_read_done = 1;
1569 } else {
1570 ff_format_io_close(v->parent, &v->input);
1571 }
1572 v->cur_seq_no++;
1573
1574 c->cur_seq_no = v->cur_seq_no;
1575
1576 goto restart;
1577 }
1578
add_renditions_to_variant(HLSContext * c,struct variant * var,enum AVMediaType type,const char * group_id)1579 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1580 enum AVMediaType type, const char *group_id)
1581 {
1582 int i;
1583
1584 for (i = 0; i < c->n_renditions; i++) {
1585 struct rendition *rend = c->renditions[i];
1586
1587 if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1588
1589 if (rend->playlist)
1590 /* rendition is an external playlist
1591 * => add the playlist to the variant */
1592 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1593 else
1594 /* rendition is part of the variant main Media Playlist
1595 * => add the rendition to the main Media Playlist */
1596 dynarray_add(&var->playlists[0]->renditions,
1597 &var->playlists[0]->n_renditions,
1598 rend);
1599 }
1600 }
1601 }
1602
add_metadata_from_renditions(AVFormatContext * s,struct playlist * pls,enum AVMediaType type)1603 static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1604 enum AVMediaType type)
1605 {
1606 int rend_idx = 0;
1607 int i;
1608
1609 for (i = 0; i < pls->n_main_streams; i++) {
1610 AVStream *st = pls->main_streams[i];
1611
1612 if (st->codecpar->codec_type != type)
1613 continue;
1614
1615 for (; rend_idx < pls->n_renditions; rend_idx++) {
1616 struct rendition *rend = pls->renditions[rend_idx];
1617
1618 if (rend->type != type)
1619 continue;
1620
1621 if (rend->language[0])
1622 av_dict_set(&st->metadata, "language", rend->language, 0);
1623 if (rend->name[0])
1624 av_dict_set(&st->metadata, "comment", rend->name, 0);
1625
1626 st->disposition |= rend->disposition;
1627 }
1628 if (rend_idx >=pls->n_renditions)
1629 break;
1630 }
1631 }
1632
1633 /* if timestamp was in valid range: returns 1 and sets seq_no
1634 * if not: returns 0 and sets seq_no to closest segment */
find_timestamp_in_playlist(HLSContext * c,struct playlist * pls,int64_t timestamp,int * seq_no)1635 static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
1636 int64_t timestamp, int *seq_no)
1637 {
1638 int i;
1639 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1640 0 : c->first_timestamp;
1641
1642 if (timestamp < pos) {
1643 *seq_no = pls->start_seq_no;
1644 return 0;
1645 }
1646
1647 for (i = 0; i < pls->n_segments; i++) {
1648 int64_t diff = pos + pls->segments[i]->duration - timestamp;
1649 if (diff > 0) {
1650 *seq_no = pls->start_seq_no + i;
1651 return 1;
1652 }
1653 pos += pls->segments[i]->duration;
1654 }
1655
1656 *seq_no = pls->start_seq_no + pls->n_segments - 1;
1657
1658 return 0;
1659 }
1660
select_cur_seq_no(HLSContext * c,struct playlist * pls)1661 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1662 {
1663 int seq_no;
1664
1665 if (!pls->finished && !c->first_packet &&
1666 av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
1667 /* reload the playlist since it was suspended */
1668 parse_playlist(c, pls->url, pls, NULL);
1669
1670 /* If playback is already in progress (we are just selecting a new
1671 * playlist) and this is a complete file, find the matching segment
1672 * by counting durations. */
1673 if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1674 find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1675 return seq_no;
1676 }
1677
1678 if (!pls->finished) {
1679 if (!c->first_packet && /* we are doing a segment selection during playback */
1680 c->cur_seq_no >= pls->start_seq_no &&
1681 c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1682 /* While spec 3.4.3 says that we cannot assume anything about the
1683 * content at the same sequence number on different playlists,
1684 * in practice this seems to work and doing it otherwise would
1685 * require us to download a segment to inspect its timestamps. */
1686 return c->cur_seq_no;
1687
1688 /* If this is a live stream, start live_start_index segments from the
1689 * start or end */
1690 if (c->live_start_index < 0)
1691 return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
1692 else
1693 return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
1694 }
1695
1696 /* Otherwise just start on the first segment. */
1697 return pls->start_seq_no;
1698 }
1699
save_avio_options(AVFormatContext * s)1700 static int save_avio_options(AVFormatContext *s)
1701 {
1702 HLSContext *c = s->priv_data;
1703 static const char * const opts[] = {
1704 "headers", "http_proxy", "user_agent", "cookies", "referer", "rw_timeout", "icy", NULL };
1705 const char * const * opt = opts;
1706 uint8_t *buf;
1707 int ret = 0;
1708
1709 while (*opt) {
1710 if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
1711 ret = av_dict_set(&c->avio_opts, *opt, buf,
1712 AV_DICT_DONT_STRDUP_VAL);
1713 if (ret < 0)
1714 return ret;
1715 }
1716 opt++;
1717 }
1718
1719 return ret;
1720 }
1721
nested_io_open(AVFormatContext * s,AVIOContext ** pb,const char * url,int flags,AVDictionary ** opts)1722 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1723 int flags, AVDictionary **opts)
1724 {
1725 av_log(s, AV_LOG_ERROR,
1726 "A HLS playlist item '%s' referred to an external file '%s'. "
1727 "Opening this file was forbidden for security reasons\n",
1728 s->url, url);
1729 return AVERROR(EPERM);
1730 }
1731
add_stream_to_programs(AVFormatContext * s,struct playlist * pls,AVStream * stream)1732 static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
1733 {
1734 HLSContext *c = s->priv_data;
1735 int i, j;
1736 int bandwidth = -1;
1737
1738 for (i = 0; i < c->n_variants; i++) {
1739 struct variant *v = c->variants[i];
1740
1741 for (j = 0; j < v->n_playlists; j++) {
1742 if (v->playlists[j] != pls)
1743 continue;
1744
1745 av_program_add_stream_index(s, i, stream->index);
1746
1747 if (bandwidth < 0)
1748 bandwidth = v->bandwidth;
1749 else if (bandwidth != v->bandwidth)
1750 bandwidth = -1; /* stream in multiple variants with different bandwidths */
1751 }
1752 }
1753
1754 if (bandwidth >= 0)
1755 av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
1756 }
1757
set_stream_info_from_input_stream(AVStream * st,struct playlist * pls,AVStream * ist)1758 static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
1759 {
1760 int err;
1761
1762 err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
1763 if (err < 0)
1764 return err;
1765
1766 if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1767 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1768 else
1769 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1770
1771 st->internal->need_context_update = 1;
1772
1773 return 0;
1774 }
1775
1776 /* add new subdemuxer streams to our context, if any */
update_streams_from_subdemuxer(AVFormatContext * s,struct playlist * pls)1777 static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
1778 {
1779 int err;
1780
1781 while (pls->n_main_streams < pls->ctx->nb_streams) {
1782 int ist_idx = pls->n_main_streams;
1783 AVStream *st = avformat_new_stream(s, NULL);
1784 AVStream *ist = pls->ctx->streams[ist_idx];
1785
1786 if (!st)
1787 return AVERROR(ENOMEM);
1788
1789 st->id = pls->index;
1790 dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
1791
1792 add_stream_to_programs(s, pls, st);
1793
1794 err = set_stream_info_from_input_stream(st, pls, ist);
1795 if (err < 0)
1796 return err;
1797 }
1798
1799 return 0;
1800 }
1801
update_noheader_flag(AVFormatContext * s)1802 static void update_noheader_flag(AVFormatContext *s)
1803 {
1804 HLSContext *c = s->priv_data;
1805 int flag_needed = 0;
1806 int i;
1807
1808 for (i = 0; i < c->n_playlists; i++) {
1809 struct playlist *pls = c->playlists[i];
1810
1811 if (pls->has_noheader_flag) {
1812 flag_needed = 1;
1813 break;
1814 }
1815 }
1816
1817 if (flag_needed)
1818 s->ctx_flags |= AVFMTCTX_NOHEADER;
1819 else
1820 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
1821 }
1822
hls_close(AVFormatContext * s)1823 static int hls_close(AVFormatContext *s)
1824 {
1825 HLSContext *c = s->priv_data;
1826
1827 free_playlist_list(c);
1828 free_variant_list(c);
1829 free_rendition_list(c);
1830
1831 av_dict_free(&c->avio_opts);
1832 ff_format_io_close(c->ctx, &c->playlist_pb);
1833
1834 return 0;
1835 }
1836
hls_read_header(AVFormatContext * s)1837 static int hls_read_header(AVFormatContext *s)
1838 {
1839 HLSContext *c = s->priv_data;
1840 int ret = 0, i;
1841 int highest_cur_seq_no = 0;
1842
1843 c->ctx = s;
1844 c->interrupt_callback = &s->interrupt_callback;
1845
1846 c->first_packet = 1;
1847 c->first_timestamp = AV_NOPTS_VALUE;
1848 c->cur_timestamp = AV_NOPTS_VALUE;
1849
1850 if ((ret = save_avio_options(s)) < 0)
1851 goto fail;
1852
1853 /* XXX: Some HLS servers don't like being sent the range header,
1854 in this case, need to setting http_seekable = 0 to disable
1855 the range header */
1856 av_dict_set_int(&c->avio_opts, "seekable", c->http_seekable, 0);
1857
1858 if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
1859 goto fail;
1860
1861 if (c->n_variants == 0) {
1862 av_log(s, AV_LOG_WARNING, "Empty playlist\n");
1863 ret = AVERROR_EOF;
1864 goto fail;
1865 }
1866 /* If the playlist only contained playlists (Master Playlist),
1867 * parse each individual playlist. */
1868 if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1869 for (i = 0; i < c->n_playlists; i++) {
1870 struct playlist *pls = c->playlists[i];
1871 pls->m3u8_hold_counters = 0;
1872 if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) {
1873 av_log(s, AV_LOG_WARNING, "parse_playlist error %s [%s]\n", av_err2str(ret), pls->url);
1874 pls->broken = 1;
1875 if (c->n_playlists > 1)
1876 continue;
1877 goto fail;
1878 }
1879 }
1880 }
1881
1882 for (i = 0; i < c->n_variants; i++) {
1883 if (c->variants[i]->playlists[0]->n_segments == 0) {
1884 av_log(s, AV_LOG_WARNING, "Empty segment [%s]\n", c->variants[i]->playlists[0]->url);
1885 c->variants[i]->playlists[0]->broken = 1;
1886 }
1887 }
1888
1889 /* If this isn't a live stream, calculate the total duration of the
1890 * stream. */
1891 if (c->variants[0]->playlists[0]->finished) {
1892 int64_t duration = 0;
1893 for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1894 duration += c->variants[0]->playlists[0]->segments[i]->duration;
1895 s->duration = duration;
1896 }
1897
1898 /* Associate renditions with variants */
1899 for (i = 0; i < c->n_variants; i++) {
1900 struct variant *var = c->variants[i];
1901
1902 if (var->audio_group[0])
1903 add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
1904 if (var->video_group[0])
1905 add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
1906 if (var->subtitles_group[0])
1907 add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
1908 }
1909
1910 /* Create a program for each variant */
1911 for (i = 0; i < c->n_variants; i++) {
1912 struct variant *v = c->variants[i];
1913 AVProgram *program;
1914
1915 program = av_new_program(s, i);
1916 if (!program)
1917 goto fail;
1918 av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1919 }
1920
1921 /* Select the starting segments */
1922 for (i = 0; i < c->n_playlists; i++) {
1923 struct playlist *pls = c->playlists[i];
1924
1925 if (pls->n_segments == 0)
1926 continue;
1927
1928 pls->cur_seq_no = select_cur_seq_no(c, pls);
1929 highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
1930 }
1931
1932 /* Open the demuxer for each playlist */
1933 for (i = 0; i < c->n_playlists; i++) {
1934 struct playlist *pls = c->playlists[i];
1935 char *url;
1936 ff_const59 AVInputFormat *in_fmt = NULL;
1937
1938 if (!(pls->ctx = avformat_alloc_context())) {
1939 ret = AVERROR(ENOMEM);
1940 goto fail;
1941 }
1942
1943 if (pls->n_segments == 0)
1944 continue;
1945
1946 pls->index = i;
1947 pls->needed = 1;
1948 pls->parent = s;
1949
1950 /*
1951 * If this is a live stream and this playlist looks like it is one segment
1952 * behind, try to sync it up so that every substream starts at the same
1953 * time position (so e.g. avformat_find_stream_info() will see packets from
1954 * all active streams within the first few seconds). This is not very generic,
1955 * though, as the sequence numbers are technically independent.
1956 */
1957 if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
1958 highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
1959 pls->cur_seq_no = highest_cur_seq_no;
1960 }
1961
1962 pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1963 if (!pls->read_buffer){
1964 ret = AVERROR(ENOMEM);
1965 avformat_free_context(pls->ctx);
1966 pls->ctx = NULL;
1967 goto fail;
1968 }
1969 ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1970 read_data, NULL, NULL);
1971 pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4;
1972 pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE;
1973 url = av_strdup(pls->segments[0]->url);
1974 ret = av_probe_input_buffer(&pls->pb, &in_fmt, url, NULL, 0, 0);
1975 av_free(url);
1976 if (ret < 0) {
1977 /* Free the ctx - it isn't initialized properly at this point,
1978 * so avformat_close_input shouldn't be called. If
1979 * avformat_open_input fails below, it frees and zeros the
1980 * context, so it doesn't need any special treatment like this. */
1981 av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1982 avformat_free_context(pls->ctx);
1983 pls->ctx = NULL;
1984 goto fail;
1985 }
1986 pls->ctx->pb = &pls->pb;
1987 pls->ctx->io_open = nested_io_open;
1988 pls->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
1989
1990 if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1991 goto fail;
1992
1993 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1994 if (ret < 0)
1995 goto fail;
1996
1997 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1998 ff_id3v2_parse_apic(pls->ctx, pls->id3_deferred_extra);
1999 avformat_queue_attached_pictures(pls->ctx);
2000 ff_id3v2_parse_priv(pls->ctx, pls->id3_deferred_extra);
2001 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
2002 }
2003
2004 if (pls->is_id3_timestamped == -1)
2005 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
2006
2007 /*
2008 * For ID3 timestamped raw audio streams we need to detect the packet
2009 * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
2010 * but for other streams we can rely on our user calling avformat_find_stream_info()
2011 * on us if they want to.
2012 */
2013 if (pls->is_id3_timestamped || (pls->n_renditions > 0 && pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) {
2014 ret = avformat_find_stream_info(pls->ctx, NULL);
2015 if (ret < 0)
2016 goto fail;
2017 }
2018
2019 pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
2020
2021 /* Create new AVStreams for each stream in this playlist */
2022 ret = update_streams_from_subdemuxer(s, pls);
2023 if (ret < 0)
2024 goto fail;
2025
2026 /*
2027 * Copy any metadata from playlist to main streams, but do not set
2028 * event flags.
2029 */
2030 if (pls->n_main_streams)
2031 av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);
2032
2033 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
2034 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
2035 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
2036 }
2037
2038 update_noheader_flag(s);
2039
2040 return 0;
2041 fail:
2042 hls_close(s);
2043 return ret;
2044 }
2045
recheck_discard_flags(AVFormatContext * s,int first)2046 static int recheck_discard_flags(AVFormatContext *s, int first)
2047 {
2048 HLSContext *c = s->priv_data;
2049 int i, changed = 0;
2050 int cur_needed;
2051
2052 /* Check if any new streams are needed */
2053 for (i = 0; i < c->n_playlists; i++) {
2054 struct playlist *pls = c->playlists[i];
2055
2056 cur_needed = playlist_needed(c->playlists[i]);
2057
2058 if (pls->broken) {
2059 continue;
2060 }
2061 if (cur_needed && !pls->needed) {
2062 pls->needed = 1;
2063 changed = 1;
2064 pls->cur_seq_no = select_cur_seq_no(c, pls);
2065 pls->pb.eof_reached = 0;
2066 if (c->cur_timestamp != AV_NOPTS_VALUE) {
2067 /* catch up */
2068 pls->seek_timestamp = c->cur_timestamp;
2069 pls->seek_flags = AVSEEK_FLAG_ANY;
2070 pls->seek_stream_index = -1;
2071 }
2072 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
2073 } else if (first && !cur_needed && pls->needed) {
2074 ff_format_io_close(pls->parent, &pls->input);
2075 pls->input_read_done = 0;
2076 ff_format_io_close(pls->parent, &pls->input_next);
2077 pls->input_next_requested = 0;
2078 pls->needed = 0;
2079 changed = 1;
2080 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
2081 }
2082 }
2083 return changed;
2084 }
2085
fill_timing_for_id3_timestamped_stream(struct playlist * pls)2086 static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
2087 {
2088 if (pls->id3_offset >= 0) {
2089 pls->pkt.dts = pls->id3_mpegts_timestamp +
2090 av_rescale_q(pls->id3_offset,
2091 pls->ctx->streams[pls->pkt.stream_index]->time_base,
2092 MPEG_TIME_BASE_Q);
2093 if (pls->pkt.duration)
2094 pls->id3_offset += pls->pkt.duration;
2095 else
2096 pls->id3_offset = -1;
2097 } else {
2098 /* there have been packets with unknown duration
2099 * since the last id3 tag, should not normally happen */
2100 pls->pkt.dts = AV_NOPTS_VALUE;
2101 }
2102
2103 if (pls->pkt.duration)
2104 pls->pkt.duration = av_rescale_q(pls->pkt.duration,
2105 pls->ctx->streams[pls->pkt.stream_index]->time_base,
2106 MPEG_TIME_BASE_Q);
2107
2108 pls->pkt.pts = AV_NOPTS_VALUE;
2109 }
2110
get_timebase(struct playlist * pls)2111 static AVRational get_timebase(struct playlist *pls)
2112 {
2113 if (pls->is_id3_timestamped)
2114 return MPEG_TIME_BASE_Q;
2115
2116 return pls->ctx->streams[pls->pkt.stream_index]->time_base;
2117 }
2118
compare_ts_with_wrapdetect(int64_t ts_a,struct playlist * pls_a,int64_t ts_b,struct playlist * pls_b)2119 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
2120 int64_t ts_b, struct playlist *pls_b)
2121 {
2122 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
2123 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
2124
2125 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
2126 }
2127
hls_read_packet(AVFormatContext * s,AVPacket * pkt)2128 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
2129 {
2130 HLSContext *c = s->priv_data;
2131 int ret, i, minplaylist = -1;
2132
2133 recheck_discard_flags(s, c->first_packet);
2134 c->first_packet = 0;
2135
2136 for (i = 0; i < c->n_playlists; i++) {
2137 struct playlist *pls = c->playlists[i];
2138 /* Make sure we've got one buffered packet from each open playlist
2139 * stream */
2140 if (pls->needed && !pls->pkt.data) {
2141 while (1) {
2142 int64_t ts_diff;
2143 AVRational tb;
2144 ret = av_read_frame(pls->ctx, &pls->pkt);
2145 if (ret < 0) {
2146 if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
2147 return ret;
2148 reset_packet(&pls->pkt);
2149 break;
2150 } else {
2151 /* stream_index check prevents matching picture attachments etc. */
2152 if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
2153 /* audio elementary streams are id3 timestamped */
2154 fill_timing_for_id3_timestamped_stream(pls);
2155 }
2156
2157 if (c->first_timestamp == AV_NOPTS_VALUE &&
2158 pls->pkt.dts != AV_NOPTS_VALUE)
2159 c->first_timestamp = av_rescale_q(pls->pkt.dts,
2160 get_timebase(pls), AV_TIME_BASE_Q);
2161 }
2162
2163 if (pls->seek_timestamp == AV_NOPTS_VALUE)
2164 break;
2165
2166 if (pls->seek_stream_index < 0 ||
2167 pls->seek_stream_index == pls->pkt.stream_index) {
2168
2169 if (pls->pkt.dts == AV_NOPTS_VALUE) {
2170 pls->seek_timestamp = AV_NOPTS_VALUE;
2171 break;
2172 }
2173
2174 tb = get_timebase(pls);
2175 ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
2176 tb.den, AV_ROUND_DOWN) -
2177 pls->seek_timestamp;
2178 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
2179 pls->pkt.flags & AV_PKT_FLAG_KEY)) {
2180 pls->seek_timestamp = AV_NOPTS_VALUE;
2181 break;
2182 }
2183 }
2184 av_packet_unref(&pls->pkt);
2185 }
2186 }
2187 /* Check if this stream has the packet with the lowest dts */
2188 if (pls->pkt.data) {
2189 struct playlist *minpls = minplaylist < 0 ?
2190 NULL : c->playlists[minplaylist];
2191 if (minplaylist < 0) {
2192 minplaylist = i;
2193 } else {
2194 int64_t dts = pls->pkt.dts;
2195 int64_t mindts = minpls->pkt.dts;
2196
2197 if (dts == AV_NOPTS_VALUE ||
2198 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
2199 minplaylist = i;
2200 }
2201 }
2202 }
2203
2204 /* If we got a packet, return it */
2205 if (minplaylist >= 0) {
2206 struct playlist *pls = c->playlists[minplaylist];
2207 AVStream *ist;
2208 AVStream *st;
2209
2210 ret = update_streams_from_subdemuxer(s, pls);
2211 if (ret < 0) {
2212 av_packet_unref(&pls->pkt);
2213 return ret;
2214 }
2215
2216 // If sub-demuxer reports updated metadata, copy it to the first stream
2217 // and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
2218 if (pls->ctx->event_flags & AVFMT_EVENT_FLAG_METADATA_UPDATED) {
2219 if (pls->n_main_streams) {
2220 st = pls->main_streams[0];
2221 av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
2222 st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
2223 }
2224 pls->ctx->event_flags &= ~AVFMT_EVENT_FLAG_METADATA_UPDATED;
2225 }
2226
2227 /* check if noheader flag has been cleared by the subdemuxer */
2228 if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
2229 pls->has_noheader_flag = 0;
2230 update_noheader_flag(s);
2231 }
2232
2233 if (pls->pkt.stream_index >= pls->n_main_streams) {
2234 av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
2235 pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
2236 av_packet_unref(&pls->pkt);
2237 return AVERROR_BUG;
2238 }
2239
2240 ist = pls->ctx->streams[pls->pkt.stream_index];
2241 st = pls->main_streams[pls->pkt.stream_index];
2242
2243 av_packet_move_ref(pkt, &pls->pkt);
2244 pkt->stream_index = st->index;
2245
2246 if (pkt->dts != AV_NOPTS_VALUE)
2247 c->cur_timestamp = av_rescale_q(pkt->dts,
2248 ist->time_base,
2249 AV_TIME_BASE_Q);
2250
2251 /* There may be more situations where this would be useful, but this at least
2252 * handles newly probed codecs properly (i.e. request_probe by mpegts). */
2253 if (ist->codecpar->codec_id != st->codecpar->codec_id) {
2254 ret = set_stream_info_from_input_stream(st, pls, ist);
2255 if (ret < 0) {
2256 return ret;
2257 }
2258 }
2259
2260 return 0;
2261 }
2262 return AVERROR_EOF;
2263 }
2264
hls_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)2265 static int hls_read_seek(AVFormatContext *s, int stream_index,
2266 int64_t timestamp, int flags)
2267 {
2268 HLSContext *c = s->priv_data;
2269 struct playlist *seek_pls = NULL;
2270 int i, seq_no;
2271 int j;
2272 int stream_subdemuxer_index;
2273 int64_t first_timestamp, seek_timestamp, duration;
2274
2275 if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
2276 return AVERROR(ENOSYS);
2277
2278 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
2279 0 : c->first_timestamp;
2280
2281 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
2282 s->streams[stream_index]->time_base.den,
2283 flags & AVSEEK_FLAG_BACKWARD ?
2284 AV_ROUND_DOWN : AV_ROUND_UP);
2285
2286 duration = s->duration == AV_NOPTS_VALUE ?
2287 0 : s->duration;
2288
2289 if (0 < duration && duration < seek_timestamp - first_timestamp)
2290 return AVERROR(EIO);
2291
2292 /* find the playlist with the specified stream */
2293 for (i = 0; i < c->n_playlists; i++) {
2294 struct playlist *pls = c->playlists[i];
2295 for (j = 0; j < pls->n_main_streams; j++) {
2296 if (pls->main_streams[j] == s->streams[stream_index]) {
2297 seek_pls = pls;
2298 stream_subdemuxer_index = j;
2299 break;
2300 }
2301 }
2302 }
2303 /* check if the timestamp is valid for the playlist with the
2304 * specified stream index */
2305 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
2306 return AVERROR(EIO);
2307
2308 /* set segment now so we do not need to search again below */
2309 seek_pls->cur_seq_no = seq_no;
2310 seek_pls->seek_stream_index = stream_subdemuxer_index;
2311
2312 for (i = 0; i < c->n_playlists; i++) {
2313 /* Reset reading */
2314 struct playlist *pls = c->playlists[i];
2315 ff_format_io_close(pls->parent, &pls->input);
2316 pls->input_read_done = 0;
2317 ff_format_io_close(pls->parent, &pls->input_next);
2318 pls->input_next_requested = 0;
2319 av_packet_unref(&pls->pkt);
2320 pls->pb.eof_reached = 0;
2321 /* Clear any buffered data */
2322 pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
2323 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
2324 pls->pb.pos = 0;
2325 /* Flush the packet queue of the subdemuxer. */
2326 ff_read_frame_flush(pls->ctx);
2327
2328 pls->seek_timestamp = seek_timestamp;
2329 pls->seek_flags = flags;
2330
2331 if (pls != seek_pls) {
2332 /* set closest segment seq_no for playlists not handled above */
2333 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
2334 /* seek the playlist to the given position without taking
2335 * keyframes into account since this playlist does not have the
2336 * specified stream where we should look for the keyframes */
2337 pls->seek_stream_index = -1;
2338 pls->seek_flags |= AVSEEK_FLAG_ANY;
2339 }
2340 }
2341
2342 c->cur_timestamp = seek_timestamp;
2343
2344 return 0;
2345 }
2346
hls_probe(const AVProbeData * p)2347 static int hls_probe(const AVProbeData *p)
2348 {
2349 /* Require #EXTM3U at the start, and either one of the ones below
2350 * somewhere for a proper match. */
2351 if (strncmp(p->buf, "#EXTM3U", 7))
2352 return 0;
2353
2354 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
2355 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
2356 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
2357 return AVPROBE_SCORE_MAX;
2358 return 0;
2359 }
2360
2361 #define OFFSET(x) offsetof(HLSContext, x)
2362 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2363 static const AVOption hls_options[] = {
2364 {"live_start_index", "segment index to start live streams at (negative values are from the end)",
2365 OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
2366 {"allowed_extensions", "List of file extensions that hls is allowed to access",
2367 OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2368 {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
2369 INT_MIN, INT_MAX, FLAGS},
2370 {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
2371 OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2372 {"m3u8_hold_counters", "The maximum number of times to load m3u8 when it refreshes without new segments",
2373 OFFSET(m3u8_hold_counters), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2374 {"http_persistent", "Use persistent HTTP connections",
2375 OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
2376 {"http_multiple", "Use multiple HTTP connections for fetching segments",
2377 OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
2378 {"http_seekable", "Use HTTP partial requests, 0 = disable, 1 = enable, -1 = auto",
2379 OFFSET(http_seekable), AV_OPT_TYPE_BOOL, { .i64 = -1}, -1, 1, FLAGS},
2380 {NULL}
2381 };
2382
2383 static const AVClass hls_class = {
2384 .class_name = "hls demuxer",
2385 .item_name = av_default_item_name,
2386 .option = hls_options,
2387 .version = LIBAVUTIL_VERSION_INT,
2388 };
2389
2390 AVInputFormat ff_hls_demuxer = {
2391 .name = "hls",
2392 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
2393 .priv_class = &hls_class,
2394 .priv_data_size = sizeof(HLSContext),
2395 .flags = AVFMT_NOGENSEARCH | AVFMT_TS_DISCONT,
2396 .read_probe = hls_probe,
2397 .read_header = hls_read_header,
2398 .read_packet = hls_read_packet,
2399 .read_close = hls_close,
2400 .read_seek = hls_read_seek,
2401 };
2402