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