1 /*
2 * Apple HTTP Live Streaming demuxer
3 * Copyright (c) 2010 Martin Storsjo
4 * Copyright (c) 2013 Anssi Hannula
5 * Copyright (c) 2021 Nachiket Tarate
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * Apple HTTP Live Streaming demuxer
27 * https://www.rfc-editor.org/rfc/rfc8216.txt
28 */
29
30 #include "config_components.h"
31
32 #include "libavformat/http.h"
33 #include "libavutil/aes.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/avassert.h"
36 #include "libavutil/intreadwrite.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/dict.h"
40 #include "libavutil/time.h"
41 #include "avformat.h"
42 #include "demux.h"
43 #include "internal.h"
44 #include "avio_internal.h"
45 #include "id3v2.h"
46
47 #include "hls_sample_encryption.h"
48
49 #define INITIAL_BUFFER_SIZE 32768
50
51 #define MAX_FIELD_LEN 64
52 #define MAX_CHARACTERISTICS_LEN 512
53
54 #define MPEG_TIME_BASE 90000
55 #define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
56
57 /*
58 * An apple http stream consists of a playlist with media segment files,
59 * played sequentially. There may be several playlists with the same
60 * video content, in different bandwidth variants, that are played in
61 * parallel (preferably only one bandwidth variant at a time). In this case,
62 * the user supplied the url to a main playlist that only lists the variant
63 * playlists.
64 *
65 * If the main playlist doesn't point at any variants, we still create
66 * one anonymous toplevel variant for this, to maintain the structure.
67 */
68
69 enum KeyType {
70 KEY_NONE,
71 KEY_AES_128,
72 KEY_SAMPLE_AES
73 };
74
75 struct segment {
76 int64_t duration;
77 int64_t url_offset;
78 int64_t size;
79 char *url;
80 char *key;
81 enum KeyType key_type;
82 uint8_t iv[16];
83 /* associated Media Initialization Section, treated as a segment */
84 struct segment *init_section;
85 };
86
87 struct rendition;
88
89 enum PlaylistType {
90 PLS_TYPE_UNSPECIFIED,
91 PLS_TYPE_EVENT,
92 PLS_TYPE_VOD
93 };
94
95 /*
96 * Each playlist has its own demuxer. If it currently is active,
97 * it has an open AVIOContext too, and potentially an AVPacket
98 * containing the next packet from this stream.
99 */
100 struct playlist {
101 char url[MAX_URL_SIZE];
102 FFIOContext pb;
103 uint8_t* read_buffer;
104 AVIOContext *input;
105 int input_read_done;
106 AVIOContext *input_next;
107 int input_next_requested;
108 AVFormatContext *parent;
109 int index;
110 AVFormatContext *ctx;
111 AVPacket *pkt;
112 int has_noheader_flag;
113
114 /* main demuxer streams associated with this playlist
115 * indexed by the subdemuxer stream indexes */
116 AVStream **main_streams;
117 int n_main_streams;
118
119 int finished;
120 enum PlaylistType type;
121 int64_t target_duration;
122 int64_t start_seq_no;
123 int time_offset_flag;
124 int64_t start_time_offset;
125 int n_segments;
126 struct segment **segments;
127 int needed;
128 int broken;
129 int64_t cur_seq_no;
130 int64_t last_seq_no;
131 int m3u8_hold_counters;
132 int64_t cur_seg_offset;
133 int64_t last_load_time;
134
135 /* Currently active Media Initialization Section */
136 struct segment *cur_init_section;
137 uint8_t *init_sec_buf;
138 unsigned int init_sec_buf_size;
139 unsigned int init_sec_data_len;
140 unsigned int init_sec_buf_read_offset;
141
142 char key_url[MAX_URL_SIZE];
143 uint8_t key[16];
144
145 /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
146 * (and possibly other ID3 tags) in the beginning of each segment) */
147 int is_id3_timestamped; /* -1: not yet known */
148 int64_t id3_mpegts_timestamp; /* in mpegts tb */
149 int64_t id3_offset; /* in stream original tb */
150 uint8_t* id3_buf; /* temp buffer for id3 parsing */
151 unsigned int id3_buf_size;
152 AVDictionary *id3_initial; /* data from first id3 tag */
153 int id3_found; /* ID3 tag found at some point */
154 int id3_changed; /* ID3 tag data has changed at some point */
155 ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
156
157 HLSAudioSetupInfo audio_setup_info;
158
159 int64_t seek_timestamp;
160 int seek_flags;
161 int seek_stream_index; /* into subdemuxer stream array */
162
163 /* Renditions associated with this playlist, if any.
164 * Alternative rendition playlists have a single rendition associated
165 * with them, and variant main Media Playlists may have
166 * multiple (playlist-less) renditions associated with them. */
167 int n_renditions;
168 struct rendition **renditions;
169
170 /* Media Initialization Sections (EXT-X-MAP) associated with this
171 * playlist, if any. */
172 int n_init_sections;
173 struct segment **init_sections;
174 };
175
176 /*
177 * Renditions are e.g. alternative subtitle or audio streams.
178 * The rendition may either be an external playlist or it may be
179 * contained in the main Media Playlist of the variant (in which case
180 * playlist is NULL).
181 */
182 struct rendition {
183 enum AVMediaType type;
184 struct playlist *playlist;
185 char group_id[MAX_FIELD_LEN];
186 char language[MAX_FIELD_LEN];
187 char name[MAX_FIELD_LEN];
188 int disposition;
189 };
190
191 struct variant {
192 int bandwidth;
193
194 /* every variant contains at least the main Media Playlist in index 0 */
195 int n_playlists;
196 struct playlist **playlists;
197
198 char audio_group[MAX_FIELD_LEN];
199 char video_group[MAX_FIELD_LEN];
200 char subtitles_group[MAX_FIELD_LEN];
201 };
202
203 typedef struct HLSContext {
204 AVClass *class;
205 AVFormatContext *ctx;
206 int n_variants;
207 struct variant **variants;
208 int n_playlists;
209 struct playlist **playlists;
210 int n_renditions;
211 struct rendition **renditions;
212
213 int64_t cur_seq_no;
214 int m3u8_hold_counters;
215 int live_start_index;
216 int prefer_x_start;
217 int first_packet;
218 int64_t first_timestamp;
219 int64_t cur_timestamp;
220 AVIOInterruptCB *interrupt_callback;
221 AVDictionary *avio_opts;
222 AVDictionary *seg_format_opts;
223 char *allowed_extensions;
224 int max_reload;
225 int http_persistent;
226 int http_multiple;
227 int http_seekable;
228 AVIOContext *playlist_pb;
229 HLSCryptoContext crypto_ctx;
230 } HLSContext;
231
free_segment_dynarray(struct segment **segments, int n_segments)232 static void free_segment_dynarray(struct segment **segments, int n_segments)
233 {
234 int i;
235 for (i = 0; i < n_segments; i++) {
236 av_freep(&segments[i]->key);
237 av_freep(&segments[i]->url);
238 av_freep(&segments[i]);
239 }
240 }
241
free_segment_list(struct playlist *pls)242 static void free_segment_list(struct playlist *pls)
243 {
244 free_segment_dynarray(pls->segments, pls->n_segments);
245 av_freep(&pls->segments);
246 pls->n_segments = 0;
247 }
248
free_init_section_list(struct playlist *pls)249 static void free_init_section_list(struct playlist *pls)
250 {
251 int i;
252 for (i = 0; i < pls->n_init_sections; i++) {
253 av_freep(&pls->init_sections[i]->key);
254 av_freep(&pls->init_sections[i]->url);
255 av_freep(&pls->init_sections[i]);
256 }
257 av_freep(&pls->init_sections);
258 pls->n_init_sections = 0;
259 }
260
free_playlist_list(HLSContext *c)261 static void free_playlist_list(HLSContext *c)
262 {
263 int i;
264 for (i = 0; i < c->n_playlists; i++) {
265 struct playlist *pls = c->playlists[i];
266 free_segment_list(pls);
267 free_init_section_list(pls);
268 av_freep(&pls->main_streams);
269 av_freep(&pls->renditions);
270 av_freep(&pls->id3_buf);
271 av_dict_free(&pls->id3_initial);
272 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
273 av_freep(&pls->init_sec_buf);
274 av_packet_free(&pls->pkt);
275 av_freep(&pls->pb.pub.buffer);
276 ff_format_io_close(c->ctx, &pls->input);
277 pls->input_read_done = 0;
278 ff_format_io_close(c->ctx, &pls->input_next);
279 pls->input_next_requested = 0;
280 if (pls->ctx) {
281 pls->ctx->pb = NULL;
282 avformat_close_input(&pls->ctx);
283 }
284 av_free(pls);
285 }
286 av_freep(&c->playlists);
287 c->n_playlists = 0;
288 }
289
free_variant_list(HLSContext *c)290 static void free_variant_list(HLSContext *c)
291 {
292 int i;
293 for (i = 0; i < c->n_variants; i++) {
294 struct variant *var = c->variants[i];
295 av_freep(&var->playlists);
296 av_free(var);
297 }
298 av_freep(&c->variants);
299 c->n_variants = 0;
300 }
301
free_rendition_list(HLSContext *c)302 static void free_rendition_list(HLSContext *c)
303 {
304 int i;
305 for (i = 0; i < c->n_renditions; i++)
306 av_freep(&c->renditions[i]);
307 av_freep(&c->renditions);
308 c->n_renditions = 0;
309 }
310
new_playlist(HLSContext *c, const char *url, const char *base)311 static struct playlist *new_playlist(HLSContext *c, const char *url,
312 const char *base)
313 {
314 struct playlist *pls = av_mallocz(sizeof(struct playlist));
315 if (!pls)
316 return NULL;
317 pls->pkt = av_packet_alloc();
318 if (!pls->pkt) {
319 av_free(pls);
320 return NULL;
321 }
322 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
323 if (!pls->url[0]) {
324 av_packet_free(&pls->pkt);
325 av_free(pls);
326 return NULL;
327 }
328 pls->seek_timestamp = AV_NOPTS_VALUE;
329
330 pls->is_id3_timestamped = -1;
331 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
332
333 dynarray_add(&c->playlists, &c->n_playlists, pls);
334 return pls;
335 }
336
337 struct variant_info {
338 char bandwidth[20];
339 /* variant group ids: */
340 char audio[MAX_FIELD_LEN];
341 char video[MAX_FIELD_LEN];
342 char subtitles[MAX_FIELD_LEN];
343 };
344
new_variant(HLSContext *c, struct variant_info *info, const char *url, const char *base)345 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
346 const char *url, const char *base)
347 {
348 struct variant *var;
349 struct playlist *pls;
350
351 pls = new_playlist(c, url, base);
352 if (!pls)
353 return NULL;
354
355 var = av_mallocz(sizeof(struct variant));
356 if (!var)
357 return NULL;
358
359 if (info) {
360 var->bandwidth = atoi(info->bandwidth);
361 strcpy(var->audio_group, info->audio);
362 strcpy(var->video_group, info->video);
363 strcpy(var->subtitles_group, info->subtitles);
364 }
365
366 dynarray_add(&c->variants, &c->n_variants, var);
367 dynarray_add(&var->playlists, &var->n_playlists, pls);
368 return var;
369 }
370
handle_variant_args(struct variant_info *info, const char *key, int key_len, char **dest, int *dest_len)371 static void handle_variant_args(struct variant_info *info, const char *key,
372 int key_len, char **dest, int *dest_len)
373 {
374 if (!strncmp(key, "BANDWIDTH=", key_len)) {
375 *dest = info->bandwidth;
376 *dest_len = sizeof(info->bandwidth);
377 } else if (!strncmp(key, "AUDIO=", key_len)) {
378 *dest = info->audio;
379 *dest_len = sizeof(info->audio);
380 } else if (!strncmp(key, "VIDEO=", key_len)) {
381 *dest = info->video;
382 *dest_len = sizeof(info->video);
383 } else if (!strncmp(key, "SUBTITLES=", key_len)) {
384 *dest = info->subtitles;
385 *dest_len = sizeof(info->subtitles);
386 }
387 }
388
389 struct key_info {
390 char uri[MAX_URL_SIZE];
391 char method[11];
392 char iv[35];
393 };
394
handle_key_args(struct key_info *info, const char *key, int key_len, char **dest, int *dest_len)395 static void handle_key_args(struct key_info *info, const char *key,
396 int key_len, char **dest, int *dest_len)
397 {
398 if (!strncmp(key, "METHOD=", key_len)) {
399 *dest = info->method;
400 *dest_len = sizeof(info->method);
401 } else if (!strncmp(key, "URI=", key_len)) {
402 *dest = info->uri;
403 *dest_len = sizeof(info->uri);
404 } else if (!strncmp(key, "IV=", key_len)) {
405 *dest = info->iv;
406 *dest_len = sizeof(info->iv);
407 }
408 }
409
410 struct init_section_info {
411 char uri[MAX_URL_SIZE];
412 char byterange[32];
413 };
414
new_init_section(struct playlist *pls, struct init_section_info *info, const char *url_base)415 static struct segment *new_init_section(struct playlist *pls,
416 struct init_section_info *info,
417 const char *url_base)
418 {
419 struct segment *sec;
420 char tmp_str[MAX_URL_SIZE], *ptr = tmp_str;
421
422 if (!info->uri[0])
423 return NULL;
424
425 sec = av_mallocz(sizeof(*sec));
426 if (!sec)
427 return NULL;
428
429 if (!av_strncasecmp(info->uri, "data:", 5)) {
430 ptr = info->uri;
431 } else {
432 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
433 if (!tmp_str[0]) {
434 av_free(sec);
435 return NULL;
436 }
437 }
438 sec->url = av_strdup(ptr);
439 if (!sec->url) {
440 av_free(sec);
441 return NULL;
442 }
443
444 if (info->byterange[0]) {
445 sec->size = strtoll(info->byterange, NULL, 10);
446 ptr = strchr(info->byterange, '@');
447 if (ptr)
448 sec->url_offset = strtoll(ptr+1, NULL, 10);
449 } else {
450 /* the entire file is the init section */
451 sec->size = -1;
452 }
453
454 dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
455
456 return sec;
457 }
458
handle_init_section_args(struct init_section_info *info, const char *key, int key_len, char **dest, int *dest_len)459 static void handle_init_section_args(struct init_section_info *info, const char *key,
460 int key_len, char **dest, int *dest_len)
461 {
462 if (!strncmp(key, "URI=", key_len)) {
463 *dest = info->uri;
464 *dest_len = sizeof(info->uri);
465 } else if (!strncmp(key, "BYTERANGE=", key_len)) {
466 *dest = info->byterange;
467 *dest_len = sizeof(info->byterange);
468 }
469 }
470
471 struct rendition_info {
472 char type[16];
473 char uri[MAX_URL_SIZE];
474 char group_id[MAX_FIELD_LEN];
475 char language[MAX_FIELD_LEN];
476 char assoc_language[MAX_FIELD_LEN];
477 char name[MAX_FIELD_LEN];
478 char defaultr[4];
479 char forced[4];
480 char characteristics[MAX_CHARACTERISTICS_LEN];
481 };
482
new_rendition(HLSContext *c, struct rendition_info *info, const char *url_base)483 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
484 const char *url_base)
485 {
486 struct rendition *rend;
487 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
488 char *characteristic;
489 char *chr_ptr;
490 char *saveptr;
491
492 if (!strcmp(info->type, "AUDIO"))
493 type = AVMEDIA_TYPE_AUDIO;
494 else if (!strcmp(info->type, "VIDEO"))
495 type = AVMEDIA_TYPE_VIDEO;
496 else if (!strcmp(info->type, "SUBTITLES"))
497 type = AVMEDIA_TYPE_SUBTITLE;
498 else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
499 /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
500 * AVC SEI RBSP anyway */
501 return NULL;
502
503 if (type == AVMEDIA_TYPE_UNKNOWN) {
504 av_log(c->ctx, AV_LOG_WARNING, "Can't support the type: %s\n", info->type);
505 return NULL;
506 }
507
508 /* URI is mandatory for subtitles as per spec */
509 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) {
510 av_log(c->ctx, AV_LOG_ERROR, "The URI tag is REQUIRED for subtitle.\n");
511 return NULL;
512 }
513
514 /* TODO: handle subtitles (each segment has to parsed separately) */
515 if (c->ctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
516 if (type == AVMEDIA_TYPE_SUBTITLE) {
517 av_log(c->ctx, AV_LOG_WARNING, "Can't support the subtitle(uri: %s)\n", info->uri);
518 return NULL;
519 }
520
521 rend = av_mallocz(sizeof(struct rendition));
522 if (!rend)
523 return NULL;
524
525 dynarray_add(&c->renditions, &c->n_renditions, rend);
526
527 rend->type = type;
528 strcpy(rend->group_id, info->group_id);
529 strcpy(rend->language, info->language);
530 strcpy(rend->name, info->name);
531
532 /* add the playlist if this is an external rendition */
533 if (info->uri[0]) {
534 rend->playlist = new_playlist(c, info->uri, url_base);
535 if (rend->playlist)
536 dynarray_add(&rend->playlist->renditions,
537 &rend->playlist->n_renditions, rend);
538 }
539
540 if (info->assoc_language[0]) {
541 int langlen = strlen(rend->language);
542 if (langlen < sizeof(rend->language) - 3) {
543 rend->language[langlen] = ',';
544 strncpy(rend->language + langlen + 1, info->assoc_language,
545 sizeof(rend->language) - langlen - 2);
546 }
547 }
548
549 if (!strcmp(info->defaultr, "YES"))
550 rend->disposition |= AV_DISPOSITION_DEFAULT;
551 if (!strcmp(info->forced, "YES"))
552 rend->disposition |= AV_DISPOSITION_FORCED;
553
554 chr_ptr = info->characteristics;
555 while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
556 if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
557 rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
558 else if (!strcmp(characteristic, "public.accessibility.describes-video"))
559 rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
560
561 chr_ptr = NULL;
562 }
563
564 return rend;
565 }
566
handle_rendition_args(struct rendition_info *info, const char *key, int key_len, char **dest, int *dest_len)567 static void handle_rendition_args(struct rendition_info *info, const char *key,
568 int key_len, char **dest, int *dest_len)
569 {
570 if (!strncmp(key, "TYPE=", key_len)) {
571 *dest = info->type;
572 *dest_len = sizeof(info->type);
573 } else if (!strncmp(key, "URI=", key_len)) {
574 *dest = info->uri;
575 *dest_len = sizeof(info->uri);
576 } else if (!strncmp(key, "GROUP-ID=", key_len)) {
577 *dest = info->group_id;
578 *dest_len = sizeof(info->group_id);
579 } else if (!strncmp(key, "LANGUAGE=", key_len)) {
580 *dest = info->language;
581 *dest_len = sizeof(info->language);
582 } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
583 *dest = info->assoc_language;
584 *dest_len = sizeof(info->assoc_language);
585 } else if (!strncmp(key, "NAME=", key_len)) {
586 *dest = info->name;
587 *dest_len = sizeof(info->name);
588 } else if (!strncmp(key, "DEFAULT=", key_len)) {
589 *dest = info->defaultr;
590 *dest_len = sizeof(info->defaultr);
591 } else if (!strncmp(key, "FORCED=", key_len)) {
592 *dest = info->forced;
593 *dest_len = sizeof(info->forced);
594 } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
595 *dest = info->characteristics;
596 *dest_len = sizeof(info->characteristics);
597 }
598 /*
599 * ignored:
600 * - AUTOSELECT: client may autoselect based on e.g. system language
601 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
602 */
603 }
604
605 /* used by parse_playlist to allocate a new variant+playlist when the
606 * playlist is detected to be a Media Playlist (not Master Playlist)
607 * and we have no parent Master Playlist (parsing of which would have
608 * allocated the variant and playlist already)
609 * *pls == NULL => Master Playlist or parentless Media Playlist
610 * *pls != NULL => parented Media Playlist, playlist+variant allocated */
ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)611 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
612 {
613 if (*pls)
614 return 0;
615 if (!new_variant(c, NULL, url, NULL))
616 return AVERROR(ENOMEM);
617 *pls = c->playlists[c->n_playlists - 1];
618 return 0;
619 }
620
open_url_keepalive(AVFormatContext *s, AVIOContext **pb, const char *url, AVDictionary **options)621 static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb,
622 const char *url, AVDictionary **options)
623 {
624 #if !CONFIG_HTTP_PROTOCOL
625 return AVERROR_PROTOCOL_NOT_FOUND;
626 #else
627 int ret;
628 URLContext *uc = ffio_geturlcontext(*pb);
629 av_assert0(uc);
630 (*pb)->eof_reached = 0;
631 ret = ff_http_do_new_request2(uc, url, options);
632 if (ret < 0) {
633 ff_format_io_close(s, pb);
634 }
635 return ret;
636 #endif
637 }
638
open_url(AVFormatContext *s, AVIOContext **pb, const char *url, AVDictionary **opts, AVDictionary *opts2, int *is_http_out)639 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
640 AVDictionary **opts, AVDictionary *opts2, int *is_http_out)
641 {
642 HLSContext *c = s->priv_data;
643 AVDictionary *tmp = NULL;
644 const char *proto_name = NULL;
645 int ret;
646 int is_http = 0;
647
648 if (av_strstart(url, "crypto", NULL)) {
649 if (url[6] == '+' || url[6] == ':')
650 proto_name = avio_find_protocol_name(url + 7);
651 } else if (av_strstart(url, "data", NULL)) {
652 if (url[4] == '+' || url[4] == ':')
653 proto_name = avio_find_protocol_name(url + 5);
654 }
655
656 if (!proto_name)
657 proto_name = avio_find_protocol_name(url);
658
659 if (!proto_name)
660 return AVERROR_INVALIDDATA;
661
662 // only http(s) & file are allowed
663 if (av_strstart(proto_name, "file", NULL)) {
664 if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
665 av_log(s, AV_LOG_ERROR,
666 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
667 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
668 url);
669 return AVERROR_INVALIDDATA;
670 }
671 } else if (av_strstart(proto_name, "http", NULL)) {
672 is_http = 1;
673 } else if (av_strstart(proto_name, "data", NULL)) {
674 ;
675 } else
676 return AVERROR_INVALIDDATA;
677
678 if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
679 ;
680 else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
681 ;
682 else if (av_strstart(url, "data", NULL) && !strncmp(proto_name, url + 5, strlen(proto_name)) && url[5 + strlen(proto_name)] == ':')
683 ;
684 else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
685 return AVERROR_INVALIDDATA;
686
687 av_dict_copy(&tmp, *opts, 0);
688 av_dict_copy(&tmp, opts2, 0);
689
690 if (is_http && c->http_persistent && *pb) {
691 ret = open_url_keepalive(c->ctx, pb, url, &tmp);
692 if (ret == AVERROR_EXIT) {
693 av_dict_free(&tmp);
694 return ret;
695 } else if (ret < 0) {
696 if (ret != AVERROR_EOF)
697 av_log(s, AV_LOG_WARNING,
698 "keepalive request failed for '%s' with error: '%s' when opening url, retrying with new connection\n",
699 url, av_err2str(ret));
700 av_dict_copy(&tmp, *opts, 0);
701 av_dict_copy(&tmp, opts2, 0);
702 ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
703 }
704 } else {
705 ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
706 }
707 if (ret >= 0) {
708 // update cookies on http response with setcookies.
709 char *new_cookies = NULL;
710
711 if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
712 av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
713
714 if (new_cookies)
715 av_dict_set(opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
716 }
717
718 av_dict_free(&tmp);
719
720 if (is_http_out)
721 *is_http_out = is_http;
722
723 return ret;
724 }
725
parse_playlist(HLSContext *c, const char *url, struct playlist *pls, AVIOContext *in)726 static int parse_playlist(HLSContext *c, const char *url,
727 struct playlist *pls, AVIOContext *in)
728 {
729 int ret = 0, is_segment = 0, is_variant = 0;
730 int64_t duration = 0;
731 enum KeyType key_type = KEY_NONE;
732 uint8_t iv[16] = "";
733 int has_iv = 0;
734 char key[MAX_URL_SIZE] = "";
735 char line[MAX_URL_SIZE];
736 const char *ptr;
737 int close_in = 0;
738 int64_t seg_offset = 0;
739 int64_t seg_size = -1;
740 uint8_t *new_url = NULL;
741 struct variant_info variant_info;
742 char tmp_str[MAX_URL_SIZE];
743 struct segment *cur_init_section = NULL;
744 int is_http = av_strstart(url, "http", NULL);
745 struct segment **prev_segments = NULL;
746 int prev_n_segments = 0;
747 int64_t prev_start_seq_no = -1;
748
749 if (is_http && !in && c->http_persistent && c->playlist_pb) {
750 in = c->playlist_pb;
751 ret = open_url_keepalive(c->ctx, &c->playlist_pb, url, NULL);
752 if (ret == AVERROR_EXIT) {
753 return ret;
754 } else if (ret < 0) {
755 if (ret != AVERROR_EOF)
756 av_log(c->ctx, AV_LOG_WARNING,
757 "keepalive request failed for '%s' with error: '%s' when parsing playlist\n",
758 url, av_err2str(ret));
759 in = NULL;
760 }
761 }
762
763 if (!in) {
764 AVDictionary *opts = NULL;
765 av_dict_copy(&opts, c->avio_opts, 0);
766
767 if (c->http_persistent)
768 av_dict_set(&opts, "multiple_requests", "1", 0);
769
770 ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
771 av_dict_free(&opts);
772 if (ret < 0)
773 return ret;
774
775 if (is_http && c->http_persistent)
776 c->playlist_pb = in;
777 else
778 close_in = 1;
779 }
780
781 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
782 url = new_url;
783
784 ff_get_chomp_line(in, line, sizeof(line));
785 if (strcmp(line, "#EXTM3U")) {
786 ret = AVERROR_INVALIDDATA;
787 goto fail;
788 }
789
790 if (pls) {
791 prev_start_seq_no = pls->start_seq_no;
792 prev_segments = pls->segments;
793 prev_n_segments = pls->n_segments;
794 pls->segments = NULL;
795 pls->n_segments = 0;
796
797 pls->finished = 0;
798 pls->type = PLS_TYPE_UNSPECIFIED;
799 }
800 while (!avio_feof(in)) {
801 ff_get_chomp_line(in, line, sizeof(line));
802 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
803 is_variant = 1;
804 memset(&variant_info, 0, sizeof(variant_info));
805 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
806 &variant_info);
807 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
808 struct key_info info = {{0}};
809 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
810 &info);
811 key_type = KEY_NONE;
812 has_iv = 0;
813 if (!strcmp(info.method, "AES-128"))
814 key_type = KEY_AES_128;
815 if (!strcmp(info.method, "SAMPLE-AES"))
816 key_type = KEY_SAMPLE_AES;
817 if (!av_strncasecmp(info.iv, "0x", 2)) {
818 ff_hex_to_data(iv, info.iv + 2);
819 has_iv = 1;
820 }
821 av_strlcpy(key, info.uri, sizeof(key));
822 } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
823 struct rendition_info info = {{0}};
824 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
825 &info);
826 new_rendition(c, &info, url);
827 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
828 int64_t t;
829 ret = ensure_playlist(c, &pls, url);
830 if (ret < 0)
831 goto fail;
832 t = strtoll(ptr, NULL, 10);
833 if (t < 0 || t >= INT64_MAX / AV_TIME_BASE) {
834 ret = AVERROR_INVALIDDATA;
835 goto fail;
836 }
837 pls->target_duration = t * AV_TIME_BASE;
838 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
839 uint64_t seq_no;
840 ret = ensure_playlist(c, &pls, url);
841 if (ret < 0)
842 goto fail;
843 seq_no = strtoull(ptr, NULL, 10);
844 if (seq_no > INT64_MAX/2) {
845 av_log(c->ctx, AV_LOG_DEBUG, "MEDIA-SEQUENCE higher than "
846 "INT64_MAX/2, mask out the highest bit\n");
847 seq_no &= INT64_MAX/2;
848 }
849 pls->start_seq_no = seq_no;
850 } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
851 ret = ensure_playlist(c, &pls, url);
852 if (ret < 0)
853 goto fail;
854 if (!strcmp(ptr, "EVENT"))
855 pls->type = PLS_TYPE_EVENT;
856 else if (!strcmp(ptr, "VOD"))
857 pls->type = PLS_TYPE_VOD;
858 } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
859 struct init_section_info info = {{0}};
860 ret = ensure_playlist(c, &pls, url);
861 if (ret < 0)
862 goto fail;
863 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
864 &info);
865 cur_init_section = new_init_section(pls, &info, url);
866 if (!cur_init_section) {
867 ret = AVERROR(ENOMEM);
868 goto fail;
869 }
870 cur_init_section->key_type = key_type;
871 if (has_iv) {
872 memcpy(cur_init_section->iv, iv, sizeof(iv));
873 } else {
874 int64_t seq = pls->start_seq_no + pls->n_segments;
875 memset(cur_init_section->iv, 0, sizeof(cur_init_section->iv));
876 AV_WB64(cur_init_section->iv + 8, seq);
877 }
878
879 if (key_type != KEY_NONE) {
880 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
881 if (!tmp_str[0]) {
882 av_free(cur_init_section);
883 ret = AVERROR_INVALIDDATA;
884 goto fail;
885 }
886 cur_init_section->key = av_strdup(tmp_str);
887 if (!cur_init_section->key) {
888 av_free(cur_init_section);
889 ret = AVERROR(ENOMEM);
890 goto fail;
891 }
892 } else {
893 cur_init_section->key = NULL;
894 }
895
896 } else if (av_strstart(line, "#EXT-X-START:", &ptr)) {
897 const char *time_offset_value = NULL;
898 ret = ensure_playlist(c, &pls, url);
899 if (ret < 0) {
900 goto fail;
901 }
902 if (av_strstart(ptr, "TIME-OFFSET=", &time_offset_value)) {
903 float offset = strtof(time_offset_value, NULL);
904 pls->start_time_offset = offset * AV_TIME_BASE;
905 pls->time_offset_flag = 1;
906 } else {
907 av_log(c->ctx, AV_LOG_WARNING, "#EXT-X-START value is"
908 "invalid, it will be ignored");
909 continue;
910 }
911 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
912 if (pls)
913 pls->finished = 1;
914 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
915 is_segment = 1;
916 duration = atof(ptr) * AV_TIME_BASE;
917 } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
918 seg_size = strtoll(ptr, NULL, 10);
919 ptr = strchr(ptr, '@');
920 if (ptr)
921 seg_offset = strtoll(ptr+1, NULL, 10);
922 } else if (av_strstart(line, "#", NULL)) {
923 av_log(c->ctx, AV_LOG_INFO, "Skip ('%s')\n", line);
924 continue;
925 } else if (line[0]) {
926 if (is_variant) {
927 if (!new_variant(c, &variant_info, line, url)) {
928 ret = AVERROR(ENOMEM);
929 goto fail;
930 }
931 is_variant = 0;
932 }
933 if (is_segment) {
934 struct segment *seg;
935 ret = ensure_playlist(c, &pls, url);
936 if (ret < 0)
937 goto fail;
938 seg = av_malloc(sizeof(struct segment));
939 if (!seg) {
940 ret = AVERROR(ENOMEM);
941 goto fail;
942 }
943 if (has_iv) {
944 memcpy(seg->iv, iv, sizeof(iv));
945 } else {
946 uint64_t seq = pls->start_seq_no + (uint64_t)pls->n_segments;
947 memset(seg->iv, 0, sizeof(seg->iv));
948 AV_WB64(seg->iv + 8, seq);
949 }
950
951 if (key_type != KEY_NONE) {
952 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
953 if (!tmp_str[0]) {
954 ret = AVERROR_INVALIDDATA;
955 av_free(seg);
956 goto fail;
957 }
958 seg->key = av_strdup(tmp_str);
959 if (!seg->key) {
960 av_free(seg);
961 ret = AVERROR(ENOMEM);
962 goto fail;
963 }
964 } else {
965 seg->key = NULL;
966 }
967
968 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
969 if (!tmp_str[0]) {
970 ret = AVERROR_INVALIDDATA;
971 if (seg->key)
972 av_free(seg->key);
973 av_free(seg);
974 goto fail;
975 }
976 seg->url = av_strdup(tmp_str);
977 if (!seg->url) {
978 av_free(seg->key);
979 av_free(seg);
980 ret = AVERROR(ENOMEM);
981 goto fail;
982 }
983
984 if (duration < 0.001 * AV_TIME_BASE) {
985 av_log(c->ctx, AV_LOG_WARNING, "Cannot get correct #EXTINF value of segment %s,"
986 " set to default value to 1ms.\n", seg->url);
987 duration = 0.001 * AV_TIME_BASE;
988 }
989 seg->duration = duration;
990 seg->key_type = key_type;
991 dynarray_add(&pls->segments, &pls->n_segments, seg);
992 is_segment = 0;
993
994 seg->size = seg_size;
995 if (seg_size >= 0) {
996 seg->url_offset = seg_offset;
997 seg_offset += seg_size;
998 seg_size = -1;
999 } else {
1000 seg->url_offset = 0;
1001 seg_offset = 0;
1002 }
1003
1004 seg->init_section = cur_init_section;
1005 }
1006 }
1007 }
1008 if (prev_segments) {
1009 if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
1010 int64_t prev_timestamp = c->first_timestamp;
1011 int i;
1012 int64_t diff = pls->start_seq_no - prev_start_seq_no;
1013 for (i = 0; i < prev_n_segments && i < diff; i++) {
1014 c->first_timestamp += prev_segments[i]->duration;
1015 }
1016 av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%"PRId64" -> %"PRId64")"
1017 " reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
1018 prev_start_seq_no, pls->start_seq_no,
1019 prev_timestamp, c->first_timestamp);
1020 } else if (pls->start_seq_no < prev_start_seq_no) {
1021 av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %"PRId64" -> %"PRId64"\n",
1022 prev_start_seq_no, pls->start_seq_no);
1023 }
1024 free_segment_dynarray(prev_segments, prev_n_segments);
1025 av_freep(&prev_segments);
1026 }
1027 if (pls)
1028 pls->last_load_time = av_gettime_relative();
1029
1030 fail:
1031 av_free(new_url);
1032 if (close_in)
1033 ff_format_io_close(c->ctx, &in);
1034 c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
1035 if (!c->n_variants || !c->variants[0]->n_playlists ||
1036 !(c->variants[0]->playlists[0]->finished ||
1037 c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
1038 c->ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
1039 return ret;
1040 }
1041
current_segment(struct playlist *pls)1042 static struct segment *current_segment(struct playlist *pls)
1043 {
1044 int64_t n = pls->cur_seq_no - pls->start_seq_no;
1045 if (n >= pls->n_segments)
1046 return NULL;
1047 return pls->segments[n];
1048 }
1049
next_segment(struct playlist *pls)1050 static struct segment *next_segment(struct playlist *pls)
1051 {
1052 int64_t n = pls->cur_seq_no - pls->start_seq_no + 1;
1053 if (n >= pls->n_segments)
1054 return NULL;
1055 return pls->segments[n];
1056 }
1057
read_from_url(struct playlist *pls, struct segment *seg, uint8_t *buf, int buf_size)1058 static int read_from_url(struct playlist *pls, struct segment *seg,
1059 uint8_t *buf, int buf_size)
1060 {
1061 int ret;
1062
1063 /* limit read if the segment was only a part of a file */
1064 if (seg->size >= 0)
1065 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
1066
1067 ret = avio_read(pls->input, buf, buf_size);
1068 if (ret > 0)
1069 pls->cur_seg_offset += ret;
1070
1071 return ret;
1072 }
1073
1074 /* Parse the raw ID3 data and pass contents to caller */
parse_id3(AVFormatContext *s, AVIOContext *pb, AVDictionary **metadata, int64_t *dts, HLSAudioSetupInfo *audio_setup_info, ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)1075 static void parse_id3(AVFormatContext *s, AVIOContext *pb,
1076 AVDictionary **metadata, int64_t *dts, HLSAudioSetupInfo *audio_setup_info,
1077 ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
1078 {
1079 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
1080 static const char id3_priv_owner_audio_setup[] = "com.apple.streaming.audioDescription";
1081 ID3v2ExtraMeta *meta;
1082
1083 ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
1084 for (meta = *extra_meta; meta; meta = meta->next) {
1085 if (!strcmp(meta->tag, "PRIV")) {
1086 ID3v2ExtraMetaPRIV *priv = &meta->data.priv;
1087 if (priv->datasize == 8 && !av_strncasecmp(priv->owner, id3_priv_owner_ts, 44)) {
1088 /* 33-bit MPEG timestamp */
1089 int64_t ts = AV_RB64(priv->data);
1090 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
1091 if ((ts & ~((1ULL << 33) - 1)) == 0)
1092 *dts = ts;
1093 else
1094 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
1095 } else if (priv->datasize >= 8 && !av_strncasecmp(priv->owner, id3_priv_owner_audio_setup, 36)) {
1096 ff_hls_senc_read_audio_setup_info(audio_setup_info, priv->data, priv->datasize);
1097 }
1098 } else if (!strcmp(meta->tag, "APIC") && apic)
1099 *apic = &meta->data.apic;
1100 }
1101 }
1102
1103 /* Check if the ID3 metadata contents have changed */
id3_has_changed_values(struct playlist *pls, AVDictionary *metadata, ID3v2ExtraMetaAPIC *apic)1104 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
1105 ID3v2ExtraMetaAPIC *apic)
1106 {
1107 AVDictionaryEntry *entry = NULL;
1108 AVDictionaryEntry *oldentry;
1109 /* check that no keys have changed values */
1110 while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
1111 oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
1112 if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
1113 return 1;
1114 }
1115
1116 /* check if apic appeared */
1117 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
1118 return 1;
1119
1120 if (apic) {
1121 int size = pls->ctx->streams[1]->attached_pic.size;
1122 if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
1123 return 1;
1124
1125 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
1126 return 1;
1127 }
1128
1129 return 0;
1130 }
1131
1132 /* Parse ID3 data and handle the found data */
handle_id3(AVIOContext *pb, struct playlist *pls)1133 static void handle_id3(AVIOContext *pb, struct playlist *pls)
1134 {
1135 AVDictionary *metadata = NULL;
1136 ID3v2ExtraMetaAPIC *apic = NULL;
1137 ID3v2ExtraMeta *extra_meta = NULL;
1138 int64_t timestamp = AV_NOPTS_VALUE;
1139
1140 parse_id3(pls->ctx, pb, &metadata, ×tamp, &pls->audio_setup_info, &apic, &extra_meta);
1141
1142 if (timestamp != AV_NOPTS_VALUE) {
1143 pls->id3_mpegts_timestamp = timestamp;
1144 pls->id3_offset = 0;
1145 }
1146
1147 if (!pls->id3_found) {
1148 /* initial ID3 tags */
1149 av_assert0(!pls->id3_deferred_extra);
1150 pls->id3_found = 1;
1151
1152 /* get picture attachment and set text metadata */
1153 if (pls->ctx->nb_streams)
1154 ff_id3v2_parse_apic(pls->ctx, extra_meta);
1155 else
1156 /* demuxer not yet opened, defer picture attachment */
1157 pls->id3_deferred_extra = extra_meta;
1158
1159 ff_id3v2_parse_priv_dict(&metadata, extra_meta);
1160 av_dict_copy(&pls->ctx->metadata, metadata, 0);
1161 pls->id3_initial = metadata;
1162
1163 } else {
1164 if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
1165 avpriv_report_missing_feature(pls->parent, "Changing ID3 metadata in HLS audio elementary stream");
1166 pls->id3_changed = 1;
1167 }
1168 av_dict_free(&metadata);
1169 }
1170
1171 if (!pls->id3_deferred_extra)
1172 ff_id3v2_free_extra_meta(&extra_meta);
1173 }
1174
intercept_id3(struct playlist *pls, uint8_t *buf, int buf_size, int *len)1175 static void intercept_id3(struct playlist *pls, uint8_t *buf,
1176 int buf_size, int *len)
1177 {
1178 /* intercept id3 tags, we do not want to pass them to the raw
1179 * demuxer on all segment switches */
1180 int bytes;
1181 int id3_buf_pos = 0;
1182 int fill_buf = 0;
1183 struct segment *seg = current_segment(pls);
1184
1185 /* gather all the id3 tags */
1186 while (1) {
1187 /* see if we can retrieve enough data for ID3 header */
1188 if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
1189 bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
1190 if (bytes > 0) {
1191
1192 if (bytes == ID3v2_HEADER_SIZE - *len)
1193 /* no EOF yet, so fill the caller buffer again after
1194 * we have stripped the ID3 tags */
1195 fill_buf = 1;
1196
1197 *len += bytes;
1198
1199 } else if (*len <= 0) {
1200 /* error/EOF */
1201 *len = bytes;
1202 fill_buf = 0;
1203 }
1204 }
1205
1206 if (*len < ID3v2_HEADER_SIZE)
1207 break;
1208
1209 if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
1210 int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
1211 int taglen = ff_id3v2_tag_len(buf);
1212 int tag_got_bytes = FFMIN(taglen, *len);
1213 int remaining = taglen - tag_got_bytes;
1214
1215 if (taglen > maxsize) {
1216 av_log(pls->parent, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
1217 taglen, maxsize);
1218 break;
1219 }
1220
1221 /*
1222 * Copy the id3 tag to our temporary id3 buffer.
1223 * We could read a small id3 tag directly without memcpy, but
1224 * we would still need to copy the large tags, and handling
1225 * both of those cases together with the possibility for multiple
1226 * tags would make the handling a bit complex.
1227 */
1228 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
1229 if (!pls->id3_buf)
1230 break;
1231 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
1232 id3_buf_pos += tag_got_bytes;
1233
1234 /* strip the intercepted bytes */
1235 *len -= tag_got_bytes;
1236 memmove(buf, buf + tag_got_bytes, *len);
1237 av_log(pls->parent, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
1238
1239 if (remaining > 0) {
1240 /* read the rest of the tag in */
1241 if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
1242 break;
1243 id3_buf_pos += remaining;
1244 av_log(pls->parent, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
1245 }
1246
1247 } else {
1248 /* no more ID3 tags */
1249 break;
1250 }
1251 }
1252
1253 /* re-fill buffer for the caller unless EOF */
1254 if (*len >= 0 && (fill_buf || *len == 0)) {
1255 bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
1256
1257 /* ignore error if we already had some data */
1258 if (bytes >= 0)
1259 *len += bytes;
1260 else if (*len == 0)
1261 *len = bytes;
1262 }
1263
1264 if (pls->id3_buf) {
1265 /* Now parse all the ID3 tags */
1266 FFIOContext id3ioctx;
1267 ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
1268 handle_id3(&id3ioctx.pub, pls);
1269 }
1270
1271 if (pls->is_id3_timestamped == -1)
1272 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
1273 }
1274
open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)1275 static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
1276 {
1277 AVDictionary *opts = NULL;
1278 int ret;
1279 int is_http = 0;
1280
1281 if (c->http_persistent)
1282 av_dict_set(&opts, "multiple_requests", "1", 0);
1283
1284 if (seg->size >= 0) {
1285 /* try to restrict the HTTP request to the part we want
1286 * (if this is in fact a HTTP request) */
1287 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1288 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1289 }
1290
1291 av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
1292 seg->url, seg->url_offset, pls->index);
1293
1294 if (seg->key_type == KEY_AES_128 || seg->key_type == KEY_SAMPLE_AES) {
1295 if (strcmp(seg->key, pls->key_url)) {
1296 AVIOContext *pb = NULL;
1297 if (open_url(pls->parent, &pb, seg->key, &c->avio_opts, opts, NULL) == 0) {
1298 ret = avio_read(pb, pls->key, sizeof(pls->key));
1299 if (ret != sizeof(pls->key)) {
1300 av_log(pls->parent, AV_LOG_ERROR, "Unable to read key file %s\n",
1301 seg->key);
1302 }
1303 ff_format_io_close(pls->parent, &pb);
1304 } else {
1305 av_log(pls->parent, AV_LOG_ERROR, "Unable to open key file %s\n",
1306 seg->key);
1307 }
1308 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
1309 }
1310 }
1311
1312 if (seg->key_type == KEY_AES_128) {
1313 char iv[33], key[33], url[MAX_URL_SIZE];
1314 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
1315 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
1316 if (strstr(seg->url, "://"))
1317 snprintf(url, sizeof(url), "crypto+%s", seg->url);
1318 else
1319 snprintf(url, sizeof(url), "crypto:%s", seg->url);
1320
1321 av_dict_set(&opts, "key", key, 0);
1322 av_dict_set(&opts, "iv", iv, 0);
1323
1324 ret = open_url(pls->parent, in, url, &c->avio_opts, opts, &is_http);
1325 if (ret < 0) {
1326 goto cleanup;
1327 }
1328 ret = 0;
1329 } else {
1330 ret = open_url(pls->parent, in, seg->url, &c->avio_opts, opts, &is_http);
1331 }
1332
1333 /* Seek to the requested position. If this was a HTTP request, the offset
1334 * should already be where want it to, but this allows e.g. local testing
1335 * without a HTTP server.
1336 *
1337 * This is not done for HTTP at all as avio_seek() does internal bookkeeping
1338 * of file offset which is out-of-sync with the actual offset when "offset"
1339 * AVOption is used with http protocol, causing the seek to not be a no-op
1340 * as would be expected. Wrong offset received from the server will not be
1341 * noticed without the call, though.
1342 */
1343 if (ret == 0 && !is_http && seg->url_offset) {
1344 int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
1345 if (seekret < 0) {
1346 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
1347 ret = seekret;
1348 ff_format_io_close(pls->parent, in);
1349 }
1350 }
1351
1352 cleanup:
1353 av_dict_free(&opts);
1354 pls->cur_seg_offset = 0;
1355 return ret;
1356 }
1357
update_init_section(struct playlist *pls, struct segment *seg)1358 static int update_init_section(struct playlist *pls, struct segment *seg)
1359 {
1360 static const int max_init_section_size = 1024*1024;
1361 HLSContext *c = pls->parent->priv_data;
1362 int64_t sec_size;
1363 int64_t urlsize;
1364 int ret;
1365
1366 if (seg->init_section == pls->cur_init_section)
1367 return 0;
1368
1369 pls->cur_init_section = NULL;
1370
1371 if (!seg->init_section)
1372 return 0;
1373
1374 ret = open_input(c, pls, seg->init_section, &pls->input);
1375 if (ret < 0) {
1376 av_log(pls->parent, AV_LOG_WARNING,
1377 "Failed to open an initialization section in playlist %d\n",
1378 pls->index);
1379 return ret;
1380 }
1381
1382 if (seg->init_section->size >= 0)
1383 sec_size = seg->init_section->size;
1384 else if ((urlsize = avio_size(pls->input)) >= 0)
1385 sec_size = urlsize;
1386 else
1387 sec_size = max_init_section_size;
1388
1389 av_log(pls->parent, AV_LOG_DEBUG,
1390 "Downloading an initialization section of size %"PRId64"\n",
1391 sec_size);
1392
1393 sec_size = FFMIN(sec_size, max_init_section_size);
1394
1395 av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1396
1397 ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
1398 pls->init_sec_buf_size);
1399 ff_format_io_close(pls->parent, &pls->input);
1400
1401 if (ret < 0)
1402 return ret;
1403
1404 pls->cur_init_section = seg->init_section;
1405 pls->init_sec_data_len = ret;
1406 pls->init_sec_buf_read_offset = 0;
1407
1408 /* spec says audio elementary streams do not have media initialization
1409 * sections, so there should be no ID3 timestamps */
1410 pls->is_id3_timestamped = 0;
1411
1412 return 0;
1413 }
1414
default_reload_interval(struct playlist *pls)1415 static int64_t default_reload_interval(struct playlist *pls)
1416 {
1417 return pls->n_segments > 0 ?
1418 pls->segments[pls->n_segments - 1]->duration :
1419 pls->target_duration;
1420 }
1421
playlist_needed(struct playlist *pls)1422 static int playlist_needed(struct playlist *pls)
1423 {
1424 AVFormatContext *s = pls->parent;
1425 int i, j;
1426 int stream_needed = 0;
1427 int first_st;
1428
1429 /* If there is no context or streams yet, the playlist is needed */
1430 if (!pls->ctx || !pls->n_main_streams)
1431 return 1;
1432
1433 /* check if any of the streams in the playlist are needed */
1434 for (i = 0; i < pls->n_main_streams; i++) {
1435 if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
1436 stream_needed = 1;
1437 break;
1438 }
1439 }
1440
1441 /* If all streams in the playlist were discarded, the playlist is not
1442 * needed (regardless of whether whole programs are discarded or not). */
1443 if (!stream_needed)
1444 return 0;
1445
1446 /* Otherwise, check if all the programs (variants) this playlist is in are
1447 * discarded. Since all streams in the playlist are part of the same programs
1448 * we can just check the programs of the first stream. */
1449
1450 first_st = pls->main_streams[0]->index;
1451
1452 for (i = 0; i < s->nb_programs; i++) {
1453 AVProgram *program = s->programs[i];
1454 if (program->discard < AVDISCARD_ALL) {
1455 for (j = 0; j < program->nb_stream_indexes; j++) {
1456 if (program->stream_index[j] == first_st) {
1457 /* playlist is in an undiscarded program */
1458 return 1;
1459 }
1460 }
1461 }
1462 }
1463
1464 /* some streams were not discarded but all the programs were */
1465 return 0;
1466 }
1467
read_data(void *opaque, uint8_t *buf, int buf_size)1468 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1469 {
1470 struct playlist *v = opaque;
1471 HLSContext *c = v->parent->priv_data;
1472 int ret;
1473 int just_opened = 0;
1474 int reload_count = 0;
1475 struct segment *seg;
1476
1477 restart:
1478 if (!v->needed)
1479 return AVERROR_EOF;
1480
1481 if (!v->input || (c->http_persistent && v->input_read_done)) {
1482 int64_t reload_interval;
1483
1484 /* Check that the playlist is still needed before opening a new
1485 * segment. */
1486 v->needed = playlist_needed(v);
1487
1488 if (!v->needed) {
1489 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
1490 v->index, v->url);
1491 return AVERROR_EOF;
1492 }
1493
1494 /* If this is a live stream and the reload interval has elapsed since
1495 * the last playlist reload, reload the playlists now. */
1496 reload_interval = default_reload_interval(v);
1497
1498 reload:
1499 reload_count++;
1500 if (reload_count > c->max_reload)
1501 return AVERROR_EOF;
1502 if (!v->finished &&
1503 av_gettime_relative() - v->last_load_time >= reload_interval) {
1504 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1505 if (ret != AVERROR_EXIT)
1506 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1507 v->index);
1508 return ret;
1509 }
1510 /* If we need to reload the playlist again below (if
1511 * there's still no more segments), switch to a reload
1512 * interval of half the target duration. */
1513 reload_interval = v->target_duration / 2;
1514 }
1515 if (v->cur_seq_no < v->start_seq_no) {
1516 av_log(v->parent, AV_LOG_WARNING,
1517 "skipping %"PRId64" segments ahead, expired from playlists\n",
1518 v->start_seq_no - v->cur_seq_no);
1519 v->cur_seq_no = v->start_seq_no;
1520 }
1521 if (v->cur_seq_no > v->last_seq_no) {
1522 v->last_seq_no = v->cur_seq_no;
1523 v->m3u8_hold_counters = 0;
1524 } else if (v->last_seq_no == v->cur_seq_no) {
1525 v->m3u8_hold_counters++;
1526 if (v->m3u8_hold_counters >= c->m3u8_hold_counters) {
1527 return AVERROR_EOF;
1528 }
1529 } else {
1530 av_log(v->parent, AV_LOG_WARNING, "maybe the m3u8 list sequence have been wraped.\n");
1531 }
1532 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1533 if (v->finished)
1534 return AVERROR_EOF;
1535 while (av_gettime_relative() - v->last_load_time < reload_interval) {
1536 if (ff_check_interrupt(c->interrupt_callback))
1537 return AVERROR_EXIT;
1538 av_usleep(100*1000);
1539 }
1540 /* Enough time has elapsed since the last reload */
1541 goto reload;
1542 }
1543
1544 v->input_read_done = 0;
1545 seg = current_segment(v);
1546
1547 /* load/update Media Initialization Section, if any */
1548 ret = update_init_section(v, seg);
1549 if (ret)
1550 return ret;
1551
1552 if (c->http_multiple == 1 && v->input_next_requested) {
1553 FFSWAP(AVIOContext *, v->input, v->input_next);
1554 v->cur_seg_offset = 0;
1555 v->input_next_requested = 0;
1556 ret = 0;
1557 } else {
1558 ret = open_input(c, v, seg, &v->input);
1559 }
1560 if (ret < 0) {
1561 if (ff_check_interrupt(c->interrupt_callback))
1562 return AVERROR_EXIT;
1563 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %"PRId64" of playlist %d\n",
1564 v->cur_seq_no,
1565 v->index);
1566 v->cur_seq_no += 1;
1567 goto reload;
1568 }
1569 just_opened = 1;
1570 }
1571
1572 if (c->http_multiple == -1) {
1573 uint8_t *http_version_opt = NULL;
1574 int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
1575 if (r >= 0) {
1576 c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
1577 av_freep(&http_version_opt);
1578 }
1579 }
1580
1581 seg = next_segment(v);
1582 if (c->http_multiple == 1 && !v->input_next_requested &&
1583 seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1584 ret = open_input(c, v, seg, &v->input_next);
1585 if (ret < 0) {
1586 if (ff_check_interrupt(c->interrupt_callback))
1587 return AVERROR_EXIT;
1588 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %"PRId64" of playlist %d\n",
1589 v->cur_seq_no + 1,
1590 v->index);
1591 } else {
1592 v->input_next_requested = 1;
1593 }
1594 }
1595
1596 if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
1597 /* Push init section out first before first actual segment */
1598 int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1599 memcpy(buf, v->init_sec_buf, copy_size);
1600 v->init_sec_buf_read_offset += copy_size;
1601 return copy_size;
1602 }
1603
1604 seg = current_segment(v);
1605 ret = read_from_url(v, seg, buf, buf_size);
1606 if (ret > 0) {
1607 if (just_opened && v->is_id3_timestamped != 0) {
1608 /* Intercept ID3 tags here, elementary audio streams are required
1609 * to convey timestamps using them in the beginning of each segment. */
1610 intercept_id3(v, buf, buf_size, &ret);
1611 }
1612
1613 return ret;
1614 }
1615 if (c->http_persistent &&
1616 seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1617 v->input_read_done = 1;
1618 } else {
1619 ff_format_io_close(v->parent, &v->input);
1620 }
1621 v->cur_seq_no++;
1622
1623 c->cur_seq_no = v->cur_seq_no;
1624
1625 goto restart;
1626 }
1627
add_renditions_to_variant(HLSContext *c, struct variant *var, enum AVMediaType type, const char *group_id)1628 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1629 enum AVMediaType type, const char *group_id)
1630 {
1631 int i;
1632
1633 for (i = 0; i < c->n_renditions; i++) {
1634 struct rendition *rend = c->renditions[i];
1635
1636 if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1637
1638 if (rend->playlist)
1639 /* rendition is an external playlist
1640 * => add the playlist to the variant */
1641 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1642 else
1643 /* rendition is part of the variant main Media Playlist
1644 * => add the rendition to the main Media Playlist */
1645 dynarray_add(&var->playlists[0]->renditions,
1646 &var->playlists[0]->n_renditions,
1647 rend);
1648 }
1649 }
1650 }
1651
add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls, enum AVMediaType type)1652 static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1653 enum AVMediaType type)
1654 {
1655 int rend_idx = 0;
1656 int i;
1657
1658 for (i = 0; i < pls->n_main_streams; i++) {
1659 AVStream *st = pls->main_streams[i];
1660
1661 if (st->codecpar->codec_type != type)
1662 continue;
1663
1664 for (; rend_idx < pls->n_renditions; rend_idx++) {
1665 struct rendition *rend = pls->renditions[rend_idx];
1666
1667 if (rend->type != type)
1668 continue;
1669
1670 if (rend->language[0])
1671 av_dict_set(&st->metadata, "language", rend->language, 0);
1672 if (rend->name[0])
1673 av_dict_set(&st->metadata, "comment", rend->name, 0);
1674
1675 st->disposition |= rend->disposition;
1676 }
1677 if (rend_idx >=pls->n_renditions)
1678 break;
1679 }
1680 }
1681
1682 /* if timestamp was in valid range: returns 1 and sets seq_no
1683 * if not: returns 0 and sets seq_no to closest segment */
find_timestamp_in_playlist(HLSContext *c, struct playlist *pls, int64_t timestamp, int64_t *seq_no, int64_t *seg_start_ts)1684 static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
1685 int64_t timestamp, int64_t *seq_no,
1686 int64_t *seg_start_ts)
1687 {
1688 int i;
1689 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1690 0 : c->first_timestamp;
1691
1692 if (timestamp < pos) {
1693 *seq_no = pls->start_seq_no;
1694 return 0;
1695 }
1696
1697 for (i = 0; i < pls->n_segments; i++) {
1698 int64_t diff = pos + pls->segments[i]->duration - timestamp;
1699 if (diff > 0) {
1700 *seq_no = pls->start_seq_no + i;
1701 if (seg_start_ts) {
1702 *seg_start_ts = pos;
1703 }
1704 return 1;
1705 }
1706 pos += pls->segments[i]->duration;
1707 }
1708
1709 *seq_no = pls->start_seq_no + pls->n_segments - 1;
1710
1711 return 0;
1712 }
1713
select_cur_seq_no(HLSContext *c, struct playlist *pls)1714 static int64_t select_cur_seq_no(HLSContext *c, struct playlist *pls)
1715 {
1716 int64_t seq_no;
1717
1718 if (!pls->finished && !c->first_packet &&
1719 av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
1720 /* reload the playlist since it was suspended */
1721 parse_playlist(c, pls->url, pls, NULL);
1722
1723 /* If playback is already in progress (we are just selecting a new
1724 * playlist) and this is a complete file, find the matching segment
1725 * by counting durations. */
1726 if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1727 find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no, NULL);
1728 return seq_no;
1729 }
1730
1731 if (!pls->finished) {
1732 if (!c->first_packet && /* we are doing a segment selection during playback */
1733 c->cur_seq_no >= pls->start_seq_no &&
1734 c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1735 /* While spec 3.4.3 says that we cannot assume anything about the
1736 * content at the same sequence number on different playlists,
1737 * in practice this seems to work and doing it otherwise would
1738 * require us to download a segment to inspect its timestamps. */
1739 return c->cur_seq_no;
1740
1741 /* If this is a live stream, start live_start_index segments from the
1742 * start or end */
1743 if (c->live_start_index < 0)
1744 seq_no = pls->start_seq_no + FFMAX(pls->n_segments +
1745 c->live_start_index, 0);
1746 else
1747 seq_no = pls->start_seq_no + FFMIN(c->live_start_index,
1748 pls->n_segments - 1);
1749
1750 /* If #EXT-X-START in playlist, need to recalculate */
1751 if (pls->time_offset_flag && c->prefer_x_start) {
1752 int64_t start_timestamp;
1753 int64_t playlist_duration = 0;
1754 int64_t cur_timestamp = c->cur_timestamp == AV_NOPTS_VALUE ? 0 :
1755 c->cur_timestamp;
1756
1757 for (int i = 0; i < pls->n_segments; i++)
1758 playlist_duration += pls->segments[i]->duration;
1759
1760 /* If the absolute value of TIME-OFFSET exceeds
1761 * the duration of the playlist, it indicates either the end of the
1762 * playlist (if positive) or the beginning of the playlist (if
1763 * negative). */
1764 if (pls->start_time_offset >=0 &&
1765 pls->start_time_offset > playlist_duration)
1766 start_timestamp = cur_timestamp + playlist_duration;
1767 else if (pls->start_time_offset >= 0 &&
1768 pls->start_time_offset <= playlist_duration)
1769 start_timestamp = cur_timestamp + pls->start_time_offset;
1770 else if (pls->start_time_offset < 0 &&
1771 pls->start_time_offset < -playlist_duration)
1772 start_timestamp = cur_timestamp;
1773 else if (pls->start_time_offset < 0 &&
1774 pls->start_time_offset > -playlist_duration)
1775 start_timestamp = cur_timestamp + playlist_duration +
1776 pls->start_time_offset;
1777 else
1778 start_timestamp = cur_timestamp;
1779
1780 find_timestamp_in_playlist(c, pls, start_timestamp, &seq_no, NULL);
1781 }
1782 return seq_no;
1783 }
1784
1785 /* Otherwise just start on the first segment. */
1786 return pls->start_seq_no;
1787 }
1788
nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **opts)1789 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1790 int flags, AVDictionary **opts)
1791 {
1792 av_log(s, AV_LOG_ERROR,
1793 "A HLS playlist item '%s' referred to an external file '%s'. "
1794 "Opening this file was forbidden for security reasons\n",
1795 s->url, url);
1796 return AVERROR(EPERM);
1797 }
1798
add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)1799 static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
1800 {
1801 HLSContext *c = s->priv_data;
1802 int i, j;
1803 int bandwidth = -1;
1804
1805 for (i = 0; i < c->n_variants; i++) {
1806 struct variant *v = c->variants[i];
1807
1808 for (j = 0; j < v->n_playlists; j++) {
1809 if (v->playlists[j] != pls)
1810 continue;
1811
1812 av_program_add_stream_index(s, i, stream->index);
1813
1814 if (bandwidth < 0)
1815 bandwidth = v->bandwidth;
1816 else if (bandwidth != v->bandwidth)
1817 bandwidth = -1; /* stream in multiple variants with different bandwidths */
1818 }
1819 }
1820
1821 if (bandwidth >= 0)
1822 av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
1823 }
1824
set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)1825 static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
1826 {
1827 int err;
1828
1829 err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
1830 if (err < 0)
1831 return err;
1832
1833 if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1834 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1835 else
1836 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1837
1838 // copy disposition
1839 st->disposition = ist->disposition;
1840
1841 // copy side data
1842 for (int i = 0; i < ist->nb_side_data; i++) {
1843 const AVPacketSideData *sd_src = &ist->side_data[i];
1844 uint8_t *dst_data;
1845
1846 dst_data = av_stream_new_side_data(st, sd_src->type, sd_src->size);
1847 if (!dst_data)
1848 return AVERROR(ENOMEM);
1849 memcpy(dst_data, sd_src->data, sd_src->size);
1850 }
1851
1852 ffstream(st)->need_context_update = 1;
1853
1854 return 0;
1855 }
1856
1857 /* add new subdemuxer streams to our context, if any */
update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)1858 static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
1859 {
1860 int err;
1861
1862 while (pls->n_main_streams < pls->ctx->nb_streams) {
1863 int ist_idx = pls->n_main_streams;
1864 AVStream *st = avformat_new_stream(s, NULL);
1865 AVStream *ist = pls->ctx->streams[ist_idx];
1866
1867 if (!st)
1868 return AVERROR(ENOMEM);
1869
1870 st->id = pls->index;
1871 dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
1872
1873 add_stream_to_programs(s, pls, st);
1874
1875 err = set_stream_info_from_input_stream(st, pls, ist);
1876 if (err < 0)
1877 return err;
1878 }
1879
1880 return 0;
1881 }
1882
update_noheader_flag(AVFormatContext *s)1883 static void update_noheader_flag(AVFormatContext *s)
1884 {
1885 HLSContext *c = s->priv_data;
1886 int flag_needed = 0;
1887 int i;
1888
1889 for (i = 0; i < c->n_playlists; i++) {
1890 struct playlist *pls = c->playlists[i];
1891
1892 if (pls->has_noheader_flag) {
1893 flag_needed = 1;
1894 break;
1895 }
1896 }
1897
1898 if (flag_needed)
1899 s->ctx_flags |= AVFMTCTX_NOHEADER;
1900 else
1901 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
1902 }
1903
hls_close(AVFormatContext *s)1904 static int hls_close(AVFormatContext *s)
1905 {
1906 HLSContext *c = s->priv_data;
1907
1908 free_playlist_list(c);
1909 free_variant_list(c);
1910 free_rendition_list(c);
1911
1912 if (c->crypto_ctx.aes_ctx)
1913 av_free(c->crypto_ctx.aes_ctx);
1914
1915 av_dict_free(&c->avio_opts);
1916 ff_format_io_close(c->ctx, &c->playlist_pb);
1917
1918 return 0;
1919 }
1920
hls_read_header(AVFormatContext *s)1921 static int hls_read_header(AVFormatContext *s)
1922 {
1923 HLSContext *c = s->priv_data;
1924 int ret = 0, i;
1925 int64_t highest_cur_seq_no = 0;
1926
1927 c->ctx = s;
1928 c->interrupt_callback = &s->interrupt_callback;
1929
1930 c->first_packet = 1;
1931 c->first_timestamp = AV_NOPTS_VALUE;
1932 c->cur_timestamp = AV_NOPTS_VALUE;
1933
1934 if ((ret = ffio_copy_url_options(s->pb, &c->avio_opts)) < 0)
1935 return ret;
1936
1937 /* XXX: Some HLS servers don't like being sent the range header,
1938 in this case, need to setting http_seekable = 0 to disable
1939 the range header */
1940 av_dict_set_int(&c->avio_opts, "seekable", c->http_seekable, 0);
1941
1942 if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
1943 return ret;
1944
1945 if (c->n_variants == 0) {
1946 av_log(s, AV_LOG_WARNING, "Empty playlist\n");
1947 return AVERROR_EOF;
1948 }
1949 /* If the playlist only contained playlists (Master Playlist),
1950 * parse each individual playlist. */
1951 if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1952 for (i = 0; i < c->n_playlists; i++) {
1953 struct playlist *pls = c->playlists[i];
1954 pls->m3u8_hold_counters = 0;
1955 if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) {
1956 av_log(s, AV_LOG_WARNING, "parse_playlist error %s [%s]\n", av_err2str(ret), pls->url);
1957 pls->broken = 1;
1958 if (c->n_playlists > 1)
1959 continue;
1960 return ret;
1961 }
1962 }
1963 }
1964
1965 for (i = 0; i < c->n_variants; i++) {
1966 if (c->variants[i]->playlists[0]->n_segments == 0) {
1967 av_log(s, AV_LOG_WARNING, "Empty segment [%s]\n", c->variants[i]->playlists[0]->url);
1968 c->variants[i]->playlists[0]->broken = 1;
1969 }
1970 }
1971
1972 /* If this isn't a live stream, calculate the total duration of the
1973 * stream. */
1974 if (c->variants[0]->playlists[0]->finished) {
1975 int64_t duration = 0;
1976 for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1977 duration += c->variants[0]->playlists[0]->segments[i]->duration;
1978 s->duration = duration;
1979 }
1980
1981 /* Associate renditions with variants */
1982 for (i = 0; i < c->n_variants; i++) {
1983 struct variant *var = c->variants[i];
1984
1985 if (var->audio_group[0])
1986 add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
1987 if (var->video_group[0])
1988 add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
1989 if (var->subtitles_group[0])
1990 add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
1991 }
1992
1993 /* Create a program for each variant */
1994 for (i = 0; i < c->n_variants; i++) {
1995 struct variant *v = c->variants[i];
1996 AVProgram *program;
1997
1998 program = av_new_program(s, i);
1999 if (!program)
2000 return AVERROR(ENOMEM);
2001 av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
2002 }
2003
2004 /* Select the starting segments */
2005 for (i = 0; i < c->n_playlists; i++) {
2006 struct playlist *pls = c->playlists[i];
2007
2008 if (pls->n_segments == 0)
2009 continue;
2010
2011 pls->cur_seq_no = select_cur_seq_no(c, pls);
2012 highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
2013 }
2014
2015 /* Open the demuxer for each playlist */
2016 for (i = 0; i < c->n_playlists; i++) {
2017 struct playlist *pls = c->playlists[i];
2018 const AVInputFormat *in_fmt = NULL;
2019 char *url;
2020 AVDictionary *options = NULL;
2021 struct segment *seg = NULL;
2022
2023 if (!(pls->ctx = avformat_alloc_context()))
2024 return AVERROR(ENOMEM);
2025
2026 if (pls->n_segments == 0)
2027 continue;
2028
2029 pls->index = i;
2030 pls->needed = 1;
2031 pls->parent = s;
2032
2033 /*
2034 * If this is a live stream and this playlist looks like it is one segment
2035 * behind, try to sync it up so that every substream starts at the same
2036 * time position (so e.g. avformat_find_stream_info() will see packets from
2037 * all active streams within the first few seconds). This is not very generic,
2038 * though, as the sequence numbers are technically independent.
2039 */
2040 if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
2041 highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
2042 pls->cur_seq_no = highest_cur_seq_no;
2043 }
2044
2045 pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
2046 if (!pls->read_buffer){
2047 avformat_free_context(pls->ctx);
2048 pls->ctx = NULL;
2049 return AVERROR(ENOMEM);
2050 }
2051
2052 ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
2053 read_data, NULL, NULL);
2054
2055 /*
2056 * If encryption scheme is SAMPLE-AES, try to read ID3 tags of
2057 * external audio track that contains audio setup information
2058 */
2059 seg = current_segment(pls);
2060 if (seg && seg->key_type == KEY_SAMPLE_AES && pls->n_renditions > 0 &&
2061 pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO) {
2062 uint8_t buf[HLS_MAX_ID3_TAGS_DATA_LEN];
2063 if ((ret = avio_read(&pls->pb.pub, buf, HLS_MAX_ID3_TAGS_DATA_LEN)) < 0) {
2064 /* Fail if error was not end of file */
2065 if (ret != AVERROR_EOF) {
2066 avformat_free_context(pls->ctx);
2067 pls->ctx = NULL;
2068 return ret;
2069 }
2070 }
2071 ret = 0;
2072 /* Reset reading */
2073 ff_format_io_close(pls->parent, &pls->input);
2074 pls->input = NULL;
2075 pls->input_read_done = 0;
2076 ff_format_io_close(pls->parent, &pls->input_next);
2077 pls->input_next = NULL;
2078 pls->input_next_requested = 0;
2079 pls->cur_seg_offset = 0;
2080 pls->cur_init_section = NULL;
2081 /* Reset EOF flag */
2082 pls->pb.pub.eof_reached = 0;
2083 /* Clear any buffered data */
2084 pls->pb.pub.buf_end = pls->pb.pub.buf_ptr = pls->pb.pub.buffer;
2085 /* Reset the position */
2086 pls->pb.pub.pos = 0;
2087 }
2088
2089 /*
2090 * If encryption scheme is SAMPLE-AES and audio setup information is present in external audio track,
2091 * use that information to find the media format, otherwise probe input data
2092 */
2093 if (seg && seg->key_type == KEY_SAMPLE_AES && pls->is_id3_timestamped &&
2094 pls->audio_setup_info.codec_id != AV_CODEC_ID_NONE) {
2095 void *iter = NULL;
2096 while ((in_fmt = av_demuxer_iterate(&iter)))
2097 if (in_fmt->raw_codec_id == pls->audio_setup_info.codec_id)
2098 break;
2099 } else {
2100 pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4;
2101 pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE;
2102 pls->ctx->interrupt_callback = s->interrupt_callback;
2103 url = av_strdup(pls->segments[0]->url);
2104 ret = av_probe_input_buffer(&pls->pb.pub, &in_fmt, url, NULL, 0, 0);
2105 if (ret < 0) {
2106 /* Free the ctx - it isn't initialized properly at this point,
2107 * so avformat_close_input shouldn't be called. If
2108 * avformat_open_input fails below, it frees and zeros the
2109 * context, so it doesn't need any special treatment like this. */
2110 av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", url);
2111 avformat_free_context(pls->ctx);
2112 pls->ctx = NULL;
2113 av_free(url);
2114 return ret;
2115 }
2116 av_free(url);
2117 }
2118
2119 if (seg && seg->key_type == KEY_SAMPLE_AES) {
2120 if (strstr(in_fmt->name, "mov")) {
2121 char key[33];
2122 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
2123 av_dict_set(&options, "decryption_key", key, 0);
2124 } else if (!c->crypto_ctx.aes_ctx) {
2125 c->crypto_ctx.aes_ctx = av_aes_alloc();
2126 if (!c->crypto_ctx.aes_ctx) {
2127 avformat_free_context(pls->ctx);
2128 pls->ctx = NULL;
2129 return AVERROR(ENOMEM);
2130 }
2131 }
2132 }
2133
2134 pls->ctx->pb = &pls->pb.pub;
2135 pls->ctx->io_open = nested_io_open;
2136 pls->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
2137
2138 if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
2139 return ret;
2140
2141 av_dict_copy(&options, c->seg_format_opts, 0);
2142
2143 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, &options);
2144 av_dict_free(&options);
2145 if (ret < 0)
2146 return ret;
2147
2148 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
2149 ff_id3v2_parse_apic(pls->ctx, pls->id3_deferred_extra);
2150 avformat_queue_attached_pictures(pls->ctx);
2151 ff_id3v2_parse_priv(pls->ctx, pls->id3_deferred_extra);
2152 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
2153 }
2154
2155 if (pls->is_id3_timestamped == -1)
2156 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
2157
2158 /*
2159 * For ID3 timestamped raw audio streams we need to detect the packet
2160 * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
2161 * but for other streams we can rely on our user calling avformat_find_stream_info()
2162 * on us if they want to.
2163 */
2164 if (pls->is_id3_timestamped || (pls->n_renditions > 0 && pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) {
2165 if (seg && seg->key_type == KEY_SAMPLE_AES && pls->audio_setup_info.setup_data_length > 0 &&
2166 pls->ctx->nb_streams == 1)
2167 ret = ff_hls_senc_parse_audio_setup_info(pls->ctx->streams[0], &pls->audio_setup_info);
2168 else
2169 ret = avformat_find_stream_info(pls->ctx, NULL);
2170
2171 if (ret < 0)
2172 return ret;
2173 }
2174
2175 pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
2176
2177 /* Create new AVStreams for each stream in this playlist */
2178 ret = update_streams_from_subdemuxer(s, pls);
2179 if (ret < 0)
2180 return ret;
2181
2182 /*
2183 * Copy any metadata from playlist to main streams, but do not set
2184 * event flags.
2185 */
2186 if (pls->n_main_streams)
2187 av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);
2188
2189 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
2190 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
2191 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
2192 }
2193
2194 update_noheader_flag(s);
2195
2196 return 0;
2197 }
2198
recheck_discard_flags(AVFormatContext *s, int first)2199 static int recheck_discard_flags(AVFormatContext *s, int first)
2200 {
2201 HLSContext *c = s->priv_data;
2202 int i, changed = 0;
2203 int cur_needed;
2204
2205 /* Check if any new streams are needed */
2206 for (i = 0; i < c->n_playlists; i++) {
2207 struct playlist *pls = c->playlists[i];
2208
2209 cur_needed = playlist_needed(c->playlists[i]);
2210
2211 if (pls->broken) {
2212 continue;
2213 }
2214 if (cur_needed && !pls->needed) {
2215 pls->needed = 1;
2216 changed = 1;
2217 pls->cur_seq_no = select_cur_seq_no(c, pls);
2218 pls->pb.pub.eof_reached = 0;
2219 if (c->cur_timestamp != AV_NOPTS_VALUE) {
2220 /* catch up */
2221 pls->seek_timestamp = c->cur_timestamp;
2222 pls->seek_flags = AVSEEK_FLAG_ANY;
2223 pls->seek_stream_index = -1;
2224 }
2225 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %"PRId64"\n", i, pls->cur_seq_no);
2226 } else if (first && !cur_needed && pls->needed) {
2227 ff_format_io_close(pls->parent, &pls->input);
2228 pls->input_read_done = 0;
2229 ff_format_io_close(pls->parent, &pls->input_next);
2230 pls->input_next_requested = 0;
2231 pls->needed = 0;
2232 changed = 1;
2233 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
2234 }
2235 }
2236 return changed;
2237 }
2238
fill_timing_for_id3_timestamped_stream(struct playlist *pls)2239 static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
2240 {
2241 if (pls->id3_offset >= 0) {
2242 pls->pkt->dts = pls->id3_mpegts_timestamp +
2243 av_rescale_q(pls->id3_offset,
2244 pls->ctx->streams[pls->pkt->stream_index]->time_base,
2245 MPEG_TIME_BASE_Q);
2246 if (pls->pkt->duration)
2247 pls->id3_offset += pls->pkt->duration;
2248 else
2249 pls->id3_offset = -1;
2250 } else {
2251 /* there have been packets with unknown duration
2252 * since the last id3 tag, should not normally happen */
2253 pls->pkt->dts = AV_NOPTS_VALUE;
2254 }
2255
2256 if (pls->pkt->duration)
2257 pls->pkt->duration = av_rescale_q(pls->pkt->duration,
2258 pls->ctx->streams[pls->pkt->stream_index]->time_base,
2259 MPEG_TIME_BASE_Q);
2260
2261 pls->pkt->pts = AV_NOPTS_VALUE;
2262 }
2263
get_timebase(struct playlist *pls)2264 static AVRational get_timebase(struct playlist *pls)
2265 {
2266 if (pls->is_id3_timestamped)
2267 return MPEG_TIME_BASE_Q;
2268
2269 return pls->ctx->streams[pls->pkt->stream_index]->time_base;
2270 }
2271
compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a, int64_t ts_b, struct playlist *pls_b)2272 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
2273 int64_t ts_b, struct playlist *pls_b)
2274 {
2275 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
2276 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
2277
2278 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
2279 }
2280
hls_read_packet(AVFormatContext *s, AVPacket *pkt)2281 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
2282 {
2283 HLSContext *c = s->priv_data;
2284 int ret, i, minplaylist = -1;
2285
2286 recheck_discard_flags(s, c->first_packet);
2287 c->first_packet = 0;
2288
2289 for (i = 0; i < c->n_playlists; i++) {
2290 struct playlist *pls = c->playlists[i];
2291 /* Make sure we've got one buffered packet from each open playlist
2292 * stream */
2293 if (pls->needed && !pls->pkt->data) {
2294 while (1) {
2295 int64_t ts_diff;
2296 AVRational tb;
2297 struct segment *seg = NULL;
2298 ret = av_read_frame(pls->ctx, pls->pkt);
2299 if (ret < 0) {
2300 if (!avio_feof(&pls->pb.pub) && ret != AVERROR_EOF)
2301 return ret;
2302 break;
2303 } else {
2304 /* stream_index check prevents matching picture attachments etc. */
2305 if (pls->is_id3_timestamped && pls->pkt->stream_index == 0) {
2306 /* audio elementary streams are id3 timestamped */
2307 fill_timing_for_id3_timestamped_stream(pls);
2308 }
2309
2310 if (c->first_timestamp == AV_NOPTS_VALUE &&
2311 pls->pkt->dts != AV_NOPTS_VALUE)
2312 c->first_timestamp = av_rescale_q(pls->pkt->dts,
2313 get_timebase(pls), AV_TIME_BASE_Q);
2314 }
2315
2316 seg = current_segment(pls);
2317 if (seg && seg->key_type == KEY_SAMPLE_AES && !strstr(pls->ctx->iformat->name, "mov")) {
2318 enum AVCodecID codec_id = pls->ctx->streams[pls->pkt->stream_index]->codecpar->codec_id;
2319 memcpy(c->crypto_ctx.iv, seg->iv, sizeof(seg->iv));
2320 memcpy(c->crypto_ctx.key, pls->key, sizeof(pls->key));
2321 ff_hls_senc_decrypt_frame(codec_id, &c->crypto_ctx, pls->pkt);
2322 }
2323
2324 if (pls->seek_timestamp == AV_NOPTS_VALUE)
2325 break;
2326
2327 if (pls->seek_stream_index < 0 ||
2328 pls->seek_stream_index == pls->pkt->stream_index) {
2329
2330 if (pls->pkt->dts == AV_NOPTS_VALUE) {
2331 pls->seek_timestamp = AV_NOPTS_VALUE;
2332 break;
2333 }
2334
2335 tb = get_timebase(pls);
2336 ts_diff = av_rescale_rnd(pls->pkt->dts, AV_TIME_BASE,
2337 tb.den, AV_ROUND_DOWN) -
2338 pls->seek_timestamp;
2339 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
2340 pls->pkt->flags & AV_PKT_FLAG_KEY)) {
2341 pls->seek_timestamp = AV_NOPTS_VALUE;
2342 break;
2343 }
2344 }
2345 av_packet_unref(pls->pkt);
2346 }
2347 }
2348 /* Check if this stream has the packet with the lowest dts */
2349 if (pls->pkt->data) {
2350 struct playlist *minpls = minplaylist < 0 ?
2351 NULL : c->playlists[minplaylist];
2352 if (minplaylist < 0) {
2353 minplaylist = i;
2354 } else {
2355 int64_t dts = pls->pkt->dts;
2356 int64_t mindts = minpls->pkt->dts;
2357
2358 if (dts == AV_NOPTS_VALUE ||
2359 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
2360 minplaylist = i;
2361 }
2362 }
2363 }
2364
2365 /* If we got a packet, return it */
2366 if (minplaylist >= 0) {
2367 struct playlist *pls = c->playlists[minplaylist];
2368 AVStream *ist;
2369 AVStream *st;
2370
2371 ret = update_streams_from_subdemuxer(s, pls);
2372 if (ret < 0) {
2373 av_packet_unref(pls->pkt);
2374 return ret;
2375 }
2376
2377 // If sub-demuxer reports updated metadata, copy it to the first stream
2378 // and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
2379 if (pls->ctx->event_flags & AVFMT_EVENT_FLAG_METADATA_UPDATED) {
2380 if (pls->n_main_streams) {
2381 st = pls->main_streams[0];
2382 av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
2383 st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
2384 }
2385 pls->ctx->event_flags &= ~AVFMT_EVENT_FLAG_METADATA_UPDATED;
2386 }
2387
2388 /* check if noheader flag has been cleared by the subdemuxer */
2389 if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
2390 pls->has_noheader_flag = 0;
2391 update_noheader_flag(s);
2392 }
2393
2394 if (pls->pkt->stream_index >= pls->n_main_streams) {
2395 av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
2396 pls->pkt->stream_index, pls->n_main_streams, pls->ctx->nb_streams);
2397 av_packet_unref(pls->pkt);
2398 return AVERROR_BUG;
2399 }
2400
2401 ist = pls->ctx->streams[pls->pkt->stream_index];
2402 st = pls->main_streams[pls->pkt->stream_index];
2403
2404 av_packet_move_ref(pkt, pls->pkt);
2405 pkt->stream_index = st->index;
2406
2407 if (pkt->dts != AV_NOPTS_VALUE)
2408 c->cur_timestamp = av_rescale_q(pkt->dts,
2409 ist->time_base,
2410 AV_TIME_BASE_Q);
2411
2412 /* There may be more situations where this would be useful, but this at least
2413 * handles newly probed codecs properly (i.e. request_probe by mpegts). */
2414 if (ist->codecpar->codec_id != st->codecpar->codec_id) {
2415 ret = set_stream_info_from_input_stream(st, pls, ist);
2416 if (ret < 0) {
2417 return ret;
2418 }
2419 }
2420
2421 return 0;
2422 }
2423 return AVERROR_EOF;
2424 }
2425
hls_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)2426 static int hls_read_seek(AVFormatContext *s, int stream_index,
2427 int64_t timestamp, int flags)
2428 {
2429 HLSContext *c = s->priv_data;
2430 struct playlist *seek_pls = NULL;
2431 int i, j;
2432 int stream_subdemuxer_index;
2433 int64_t first_timestamp, seek_timestamp, duration;
2434 int64_t seq_no, seg_start_ts;
2435
2436 if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
2437 return AVERROR(ENOSYS);
2438
2439 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
2440 0 : c->first_timestamp;
2441
2442 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
2443 s->streams[stream_index]->time_base.den,
2444 AV_ROUND_DOWN);
2445
2446 duration = s->duration == AV_NOPTS_VALUE ?
2447 0 : s->duration;
2448
2449 if (0 < duration && duration < seek_timestamp - first_timestamp)
2450 return AVERROR(EIO);
2451
2452 /* find the playlist with the specified stream */
2453 for (i = 0; i < c->n_playlists; i++) {
2454 struct playlist *pls = c->playlists[i];
2455 for (j = 0; j < pls->n_main_streams; j++) {
2456 if (pls->main_streams[j] == s->streams[stream_index]) {
2457 seek_pls = pls;
2458 stream_subdemuxer_index = j;
2459 break;
2460 }
2461 }
2462 }
2463 /* check if the timestamp is valid for the playlist with the
2464 * specified stream index */
2465 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no, &seg_start_ts))
2466 return AVERROR(EIO);
2467
2468 if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
2469 flags & AVSEEK_FLAG_BACKWARD && !(flags & AVSEEK_FLAG_ANY)) {
2470 /* Seeking to start of segment ensures we seek to a keyframe located
2471 * before the given timestamp. */
2472 seek_timestamp = seg_start_ts;
2473 }
2474
2475 /* set segment now so we do not need to search again below */
2476 seek_pls->cur_seq_no = seq_no;
2477 seek_pls->seek_stream_index = stream_subdemuxer_index;
2478
2479 for (i = 0; i < c->n_playlists; i++) {
2480 /* Reset reading */
2481 struct playlist *pls = c->playlists[i];
2482 AVIOContext *const pb = &pls->pb.pub;
2483 ff_format_io_close(pls->parent, &pls->input);
2484 pls->input_read_done = 0;
2485 ff_format_io_close(pls->parent, &pls->input_next);
2486 pls->input_next_requested = 0;
2487 av_packet_unref(pls->pkt);
2488 pb->eof_reached = 0;
2489 /* Clear any buffered data */
2490 pb->buf_end = pb->buf_ptr = pb->buffer;
2491 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
2492 pb->pos = 0;
2493 /* Flush the packet queue of the subdemuxer. */
2494 ff_read_frame_flush(pls->ctx);
2495
2496 pls->seek_timestamp = seek_timestamp;
2497 pls->seek_flags = flags;
2498
2499 if (pls != seek_pls) {
2500 /* set closest segment seq_no for playlists not handled above */
2501 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no, NULL);
2502 /* seek the playlist to the given position without taking
2503 * keyframes into account since this playlist does not have the
2504 * specified stream where we should look for the keyframes */
2505 pls->seek_stream_index = -1;
2506 pls->seek_flags |= AVSEEK_FLAG_ANY;
2507 }
2508 }
2509
2510 c->cur_timestamp = seek_timestamp;
2511
2512 return 0;
2513 }
2514
hls_probe(const AVProbeData *p)2515 static int hls_probe(const AVProbeData *p)
2516 {
2517 /* Require #EXTM3U at the start, and either one of the ones below
2518 * somewhere for a proper match. */
2519 if (strncmp(p->buf, "#EXTM3U", 7))
2520 return 0;
2521
2522 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
2523 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
2524 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
2525 return AVPROBE_SCORE_MAX;
2526 return 0;
2527 }
2528
2529 #define OFFSET(x) offsetof(HLSContext, x)
2530 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2531 static const AVOption hls_options[] = {
2532 {"live_start_index", "segment index to start live streams at (negative values are from the end)",
2533 OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
2534 {"prefer_x_start", "prefer to use #EXT-X-START if it's in playlist instead of live_start_index",
2535 OFFSET(prefer_x_start), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS},
2536 {"allowed_extensions", "List of file extensions that hls is allowed to access",
2537 OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2538 {.str = "3gp,aac,avi,ac3,eac3,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
2539 INT_MIN, INT_MAX, FLAGS},
2540 {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
2541 OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 3}, 0, INT_MAX, FLAGS},
2542 {"m3u8_hold_counters", "The maximum number of times to load m3u8 when it refreshes without new segments",
2543 OFFSET(m3u8_hold_counters), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2544 {"http_persistent", "Use persistent HTTP connections",
2545 OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
2546 {"http_multiple", "Use multiple HTTP connections for fetching segments",
2547 OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
2548 {"http_seekable", "Use HTTP partial requests, 0 = disable, 1 = enable, -1 = auto",
2549 OFFSET(http_seekable), AV_OPT_TYPE_BOOL, { .i64 = -1}, -1, 1, FLAGS},
2550 {"seg_format_options", "Set options for segment demuxer",
2551 OFFSET(seg_format_opts), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, FLAGS},
2552 {NULL}
2553 };
2554
2555 static const AVClass hls_class = {
2556 .class_name = "hls demuxer",
2557 .item_name = av_default_item_name,
2558 .option = hls_options,
2559 .version = LIBAVUTIL_VERSION_INT,
2560 };
2561
2562 const AVInputFormat ff_hls_demuxer = {
2563 .name = "hls",
2564 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
2565 .priv_class = &hls_class,
2566 .priv_data_size = sizeof(HLSContext),
2567 .flags = AVFMT_NOGENSEARCH | AVFMT_TS_DISCONT | AVFMT_NO_BYTE_SEEK,
2568 .flags_internal = FF_FMT_INIT_CLEANUP,
2569 .read_probe = hls_probe,
2570 .read_header = hls_read_header,
2571 .read_packet = hls_read_packet,
2572 .read_close = hls_close,
2573 .read_seek = hls_read_seek,
2574 };
2575