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 "libavutil/avstring.h" 30#include "libavutil/avassert.h" 31#include "libavutil/intreadwrite.h" 32#include "libavutil/mathematics.h" 33#include "libavutil/opt.h" 34#include "libavutil/dict.h" 35#include "libavutil/time.h" 36#include "avformat.h" 37#include "internal.h" 38#include "avio_internal.h" 39#include "url.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 62enum KeyType { 63 KEY_NONE, 64 KEY_AES_128, 65}; 66 67struct segment { 68 int64_t duration; 69 int64_t url_offset; 70 int64_t size; 71 char *url; 72 char *key; 73 enum KeyType key_type; 74 uint8_t iv[16]; 75}; 76 77struct rendition; 78 79enum PlaylistType { 80 PLS_TYPE_UNSPECIFIED, 81 PLS_TYPE_EVENT, 82 PLS_TYPE_VOD 83}; 84 85/* 86 * Each playlist has its own demuxer. If it currently is active, 87 * it has an open AVIOContext too, and potentially an AVPacket 88 * containing the next packet from this stream. 89 */ 90struct playlist { 91 char url[MAX_URL_SIZE]; 92 AVIOContext pb; 93 uint8_t* read_buffer; 94 URLContext *input; 95 AVFormatContext *parent; 96 int index; 97 AVFormatContext *ctx; 98 AVPacket pkt; 99 int stream_offset; 100 101 int finished; 102 enum PlaylistType type; 103 int64_t target_duration; 104 int start_seq_no; 105 int n_segments; 106 struct segment **segments; 107 int needed, cur_needed; 108 int cur_seq_no; 109 int64_t cur_seg_offset; 110 int64_t last_load_time; 111 112 char key_url[MAX_URL_SIZE]; 113 uint8_t key[16]; 114 115 /* ID3 timestamp handling (elementary audio streams have ID3 timestamps 116 * (and possibly other ID3 tags) in the beginning of each segment) */ 117 int is_id3_timestamped; /* -1: not yet known */ 118 int64_t id3_mpegts_timestamp; /* in mpegts tb */ 119 int64_t id3_offset; /* in stream original tb */ 120 uint8_t* id3_buf; /* temp buffer for id3 parsing */ 121 unsigned int id3_buf_size; 122 AVDictionary *id3_initial; /* data from first id3 tag */ 123 int id3_found; /* ID3 tag found at some point */ 124 int id3_changed; /* ID3 tag data has changed at some point */ 125 ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */ 126 127 int64_t seek_timestamp; 128 int seek_flags; 129 int seek_stream_index; /* into subdemuxer stream array */ 130 131 /* Renditions associated with this playlist, if any. 132 * Alternative rendition playlists have a single rendition associated 133 * with them, and variant main Media Playlists may have 134 * multiple (playlist-less) renditions associated with them. */ 135 int n_renditions; 136 struct rendition **renditions; 137}; 138 139/* 140 * Renditions are e.g. alternative subtitle or audio streams. 141 * The rendition may either be an external playlist or it may be 142 * contained in the main Media Playlist of the variant (in which case 143 * playlist is NULL). 144 */ 145struct rendition { 146 enum AVMediaType type; 147 struct playlist *playlist; 148 char group_id[MAX_FIELD_LEN]; 149 char language[MAX_FIELD_LEN]; 150 char name[MAX_FIELD_LEN]; 151 int disposition; 152}; 153 154struct variant { 155 int bandwidth; 156 157 /* every variant contains at least the main Media Playlist in index 0 */ 158 int n_playlists; 159 struct playlist **playlists; 160 161 char audio_group[MAX_FIELD_LEN]; 162 char video_group[MAX_FIELD_LEN]; 163 char subtitles_group[MAX_FIELD_LEN]; 164}; 165 166typedef struct HLSContext { 167 int n_variants; 168 struct variant **variants; 169 int n_playlists; 170 struct playlist **playlists; 171 int n_renditions; 172 struct rendition **renditions; 173 174 int cur_seq_no; 175 int first_packet; 176 int64_t first_timestamp; 177 int64_t cur_timestamp; 178 AVIOInterruptCB *interrupt_callback; 179 char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context 180 char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context 181 char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context 182} HLSContext; 183 184static int read_chomp_line(AVIOContext *s, char *buf, int maxlen) 185{ 186 int len = ff_get_line(s, buf, maxlen); 187 while (len > 0 && av_isspace(buf[len - 1])) 188 buf[--len] = '\0'; 189 return len; 190} 191 192static void free_segment_list(struct playlist *pls) 193{ 194 int i; 195 for (i = 0; i < pls->n_segments; i++) { 196 av_free(pls->segments[i]->key); 197 av_free(pls->segments[i]->url); 198 av_free(pls->segments[i]); 199 } 200 av_freep(&pls->segments); 201 pls->n_segments = 0; 202} 203 204static void free_playlist_list(HLSContext *c) 205{ 206 int i; 207 for (i = 0; i < c->n_playlists; i++) { 208 struct playlist *pls = c->playlists[i]; 209 free_segment_list(pls); 210 av_freep(&pls->renditions); 211 av_freep(&pls->id3_buf); 212 av_dict_free(&pls->id3_initial); 213 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra); 214 av_free_packet(&pls->pkt); 215 av_free(pls->pb.buffer); 216 if (pls->input) 217 ffurl_close(pls->input); 218 if (pls->ctx) { 219 pls->ctx->pb = NULL; 220 avformat_close_input(&pls->ctx); 221 } 222 av_free(pls); 223 } 224 av_freep(&c->playlists); 225 av_freep(&c->cookies); 226 av_freep(&c->user_agent); 227 c->n_playlists = 0; 228} 229 230static void free_variant_list(HLSContext *c) 231{ 232 int i; 233 for (i = 0; i < c->n_variants; i++) { 234 struct variant *var = c->variants[i]; 235 av_freep(&var->playlists); 236 av_free(var); 237 } 238 av_freep(&c->variants); 239 c->n_variants = 0; 240} 241 242static void free_rendition_list(HLSContext *c) 243{ 244 int i; 245 for (i = 0; i < c->n_renditions; i++) 246 av_free(c->renditions[i]); 247 av_freep(&c->renditions); 248 c->n_renditions = 0; 249} 250 251/* 252 * Used to reset a statically allocated AVPacket to a clean slate, 253 * containing no data. 254 */ 255static void reset_packet(AVPacket *pkt) 256{ 257 av_init_packet(pkt); 258 pkt->data = NULL; 259} 260 261static struct playlist *new_playlist(HLSContext *c, const char *url, 262 const char *base) 263{ 264 struct playlist *pls = av_mallocz(sizeof(struct playlist)); 265 if (!pls) 266 return NULL; 267 reset_packet(&pls->pkt); 268 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url); 269 pls->seek_timestamp = AV_NOPTS_VALUE; 270 271 pls->is_id3_timestamped = -1; 272 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE; 273 274 dynarray_add(&c->playlists, &c->n_playlists, pls); 275 return pls; 276} 277 278struct variant_info { 279 char bandwidth[20]; 280 /* variant group ids: */ 281 char audio[MAX_FIELD_LEN]; 282 char video[MAX_FIELD_LEN]; 283 char subtitles[MAX_FIELD_LEN]; 284}; 285 286static struct variant *new_variant(HLSContext *c, struct variant_info *info, 287 const char *url, const char *base) 288{ 289 struct variant *var; 290 struct playlist *pls; 291 292 pls = new_playlist(c, url, base); 293 if (!pls) 294 return NULL; 295 296 var = av_mallocz(sizeof(struct variant)); 297 if (!var) 298 return NULL; 299 300 if (info) { 301 var->bandwidth = atoi(info->bandwidth); 302 strcpy(var->audio_group, info->audio); 303 strcpy(var->video_group, info->video); 304 strcpy(var->subtitles_group, info->subtitles); 305 } 306 307 dynarray_add(&c->variants, &c->n_variants, var); 308 dynarray_add(&var->playlists, &var->n_playlists, pls); 309 return var; 310} 311 312static void handle_variant_args(struct variant_info *info, const char *key, 313 int key_len, char **dest, int *dest_len) 314{ 315 if (!strncmp(key, "BANDWIDTH=", key_len)) { 316 *dest = info->bandwidth; 317 *dest_len = sizeof(info->bandwidth); 318 } else if (!strncmp(key, "AUDIO=", key_len)) { 319 *dest = info->audio; 320 *dest_len = sizeof(info->audio); 321 } else if (!strncmp(key, "VIDEO=", key_len)) { 322 *dest = info->video; 323 *dest_len = sizeof(info->video); 324 } else if (!strncmp(key, "SUBTITLES=", key_len)) { 325 *dest = info->subtitles; 326 *dest_len = sizeof(info->subtitles); 327 } 328} 329 330struct key_info { 331 char uri[MAX_URL_SIZE]; 332 char method[10]; 333 char iv[35]; 334}; 335 336static void handle_key_args(struct key_info *info, const char *key, 337 int key_len, char **dest, int *dest_len) 338{ 339 if (!strncmp(key, "METHOD=", key_len)) { 340 *dest = info->method; 341 *dest_len = sizeof(info->method); 342 } else if (!strncmp(key, "URI=", key_len)) { 343 *dest = info->uri; 344 *dest_len = sizeof(info->uri); 345 } else if (!strncmp(key, "IV=", key_len)) { 346 *dest = info->iv; 347 *dest_len = sizeof(info->iv); 348 } 349} 350 351struct rendition_info { 352 char type[16]; 353 char uri[MAX_URL_SIZE]; 354 char group_id[MAX_FIELD_LEN]; 355 char language[MAX_FIELD_LEN]; 356 char assoc_language[MAX_FIELD_LEN]; 357 char name[MAX_FIELD_LEN]; 358 char defaultr[4]; 359 char forced[4]; 360 char characteristics[MAX_CHARACTERISTICS_LEN]; 361}; 362 363static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info, 364 const char *url_base) 365{ 366 struct rendition *rend; 367 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN; 368 char *characteristic; 369 char *chr_ptr; 370 char *saveptr; 371 372 if (!strcmp(info->type, "AUDIO")) 373 type = AVMEDIA_TYPE_AUDIO; 374 else if (!strcmp(info->type, "VIDEO")) 375 type = AVMEDIA_TYPE_VIDEO; 376 else if (!strcmp(info->type, "SUBTITLES")) 377 type = AVMEDIA_TYPE_SUBTITLE; 378 else if (!strcmp(info->type, "CLOSED-CAPTIONS")) 379 /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in 380 * AVC SEI RBSP anyway */ 381 return NULL; 382 383 if (type == AVMEDIA_TYPE_UNKNOWN) 384 return NULL; 385 386 /* URI is mandatory for subtitles as per spec */ 387 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) 388 return NULL; 389 390 /* TODO: handle subtitles (each segment has to parsed separately) */ 391 if (type == AVMEDIA_TYPE_SUBTITLE) 392 return NULL; 393 394 rend = av_mallocz(sizeof(struct rendition)); 395 if (!rend) 396 return NULL; 397 398 dynarray_add(&c->renditions, &c->n_renditions, rend); 399 400 rend->type = type; 401 strcpy(rend->group_id, info->group_id); 402 strcpy(rend->language, info->language); 403 strcpy(rend->name, info->name); 404 405 /* add the playlist if this is an external rendition */ 406 if (info->uri[0]) { 407 rend->playlist = new_playlist(c, info->uri, url_base); 408 if (rend->playlist) 409 dynarray_add(&rend->playlist->renditions, 410 &rend->playlist->n_renditions, rend); 411 } 412 413 if (info->assoc_language[0]) { 414 int langlen = strlen(rend->language); 415 if (langlen < sizeof(rend->language) - 3) { 416 rend->language[langlen] = ','; 417 strncpy(rend->language + langlen + 1, info->assoc_language, 418 sizeof(rend->language) - langlen - 2); 419 } 420 } 421 422 if (!strcmp(info->defaultr, "YES")) 423 rend->disposition |= AV_DISPOSITION_DEFAULT; 424 if (!strcmp(info->forced, "YES")) 425 rend->disposition |= AV_DISPOSITION_FORCED; 426 427 chr_ptr = info->characteristics; 428 while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) { 429 if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound")) 430 rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; 431 else if (!strcmp(characteristic, "public.accessibility.describes-video")) 432 rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; 433 434 chr_ptr = NULL; 435 } 436 437 return rend; 438} 439 440static void handle_rendition_args(struct rendition_info *info, const char *key, 441 int key_len, char **dest, int *dest_len) 442{ 443 if (!strncmp(key, "TYPE=", key_len)) { 444 *dest = info->type; 445 *dest_len = sizeof(info->type); 446 } else if (!strncmp(key, "URI=", key_len)) { 447 *dest = info->uri; 448 *dest_len = sizeof(info->uri); 449 } else if (!strncmp(key, "GROUP-ID=", key_len)) { 450 *dest = info->group_id; 451 *dest_len = sizeof(info->group_id); 452 } else if (!strncmp(key, "LANGUAGE=", key_len)) { 453 *dest = info->language; 454 *dest_len = sizeof(info->language); 455 } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) { 456 *dest = info->assoc_language; 457 *dest_len = sizeof(info->assoc_language); 458 } else if (!strncmp(key, "NAME=", key_len)) { 459 *dest = info->name; 460 *dest_len = sizeof(info->name); 461 } else if (!strncmp(key, "DEFAULT=", key_len)) { 462 *dest = info->defaultr; 463 *dest_len = sizeof(info->defaultr); 464 } else if (!strncmp(key, "FORCED=", key_len)) { 465 *dest = info->forced; 466 *dest_len = sizeof(info->forced); 467 } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) { 468 *dest = info->characteristics; 469 *dest_len = sizeof(info->characteristics); 470 } 471 /* 472 * ignored: 473 * - AUTOSELECT: client may autoselect based on e.g. system language 474 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4") 475 */ 476} 477 478/* used by parse_playlist to allocate a new variant+playlist when the 479 * playlist is detected to be a Media Playlist (not Master Playlist) 480 * and we have no parent Master Playlist (parsing of which would have 481 * allocated the variant and playlist already) */ 482static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url) 483{ 484 if (*pls) 485 return 0; 486 if (!new_variant(c, NULL, url, NULL)) 487 return AVERROR(ENOMEM); 488 *pls = c->playlists[c->n_playlists - 1]; 489 return 0; 490} 491 492/* pls = NULL => Master Playlist or parentless Media Playlist 493 * pls = !NULL => parented Media Playlist, playlist+variant allocated */ 494static int parse_playlist(HLSContext *c, const char *url, 495 struct playlist *pls, AVIOContext *in) 496{ 497 int ret = 0, is_segment = 0, is_variant = 0; 498 int64_t duration = 0; 499 enum KeyType key_type = KEY_NONE; 500 uint8_t iv[16] = ""; 501 int has_iv = 0; 502 char key[MAX_URL_SIZE] = ""; 503 char line[MAX_URL_SIZE]; 504 const char *ptr; 505 int close_in = 0; 506 int64_t seg_offset = 0; 507 int64_t seg_size = -1; 508 uint8_t *new_url = NULL; 509 struct variant_info variant_info; 510 char tmp_str[MAX_URL_SIZE]; 511 512 if (!in) { 513 AVDictionary *opts = NULL; 514 close_in = 1; 515 /* Some HLS servers don't like being sent the range header */ 516 av_dict_set(&opts, "seekable", "0", 0); 517 518 // broker prior HTTP options that should be consistent across requests 519 av_dict_set(&opts, "user-agent", c->user_agent, 0); 520 av_dict_set(&opts, "cookies", c->cookies, 0); 521 av_dict_set(&opts, "headers", c->headers, 0); 522 523 ret = avio_open2(&in, url, AVIO_FLAG_READ, 524 c->interrupt_callback, &opts); 525 av_dict_free(&opts); 526 if (ret < 0) 527 return ret; 528 } 529 530 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) 531 url = new_url; 532 533 read_chomp_line(in, line, sizeof(line)); 534 if (strcmp(line, "#EXTM3U")) { 535 ret = AVERROR_INVALIDDATA; 536 goto fail; 537 } 538 539 if (pls) { 540 free_segment_list(pls); 541 pls->finished = 0; 542 pls->type = PLS_TYPE_UNSPECIFIED; 543 } 544 while (!url_feof(in)) { 545 read_chomp_line(in, line, sizeof(line)); 546 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) { 547 is_variant = 1; 548 memset(&variant_info, 0, sizeof(variant_info)); 549 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args, 550 &variant_info); 551 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) { 552 struct key_info info = {{0}}; 553 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args, 554 &info); 555 key_type = KEY_NONE; 556 has_iv = 0; 557 if (!strcmp(info.method, "AES-128")) 558 key_type = KEY_AES_128; 559 if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) { 560 ff_hex_to_data(iv, info.iv + 2); 561 has_iv = 1; 562 } 563 av_strlcpy(key, info.uri, sizeof(key)); 564 } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) { 565 struct rendition_info info = {{0}}; 566 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args, 567 &info); 568 new_rendition(c, &info, url); 569 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) { 570 ret = ensure_playlist(c, &pls, url); 571 if (ret < 0) 572 goto fail; 573 pls->target_duration = atoi(ptr) * AV_TIME_BASE; 574 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) { 575 ret = ensure_playlist(c, &pls, url); 576 if (ret < 0) 577 goto fail; 578 pls->start_seq_no = atoi(ptr); 579 } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) { 580 ret = ensure_playlist(c, &pls, url); 581 if (ret < 0) 582 goto fail; 583 if (!strcmp(ptr, "EVENT")) 584 pls->type = PLS_TYPE_EVENT; 585 else if (!strcmp(ptr, "VOD")) 586 pls->type = PLS_TYPE_VOD; 587 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) { 588 if (pls) 589 pls->finished = 1; 590 } else if (av_strstart(line, "#EXTINF:", &ptr)) { 591 is_segment = 1; 592 duration = atof(ptr) * AV_TIME_BASE; 593 } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) { 594 seg_size = atoi(ptr); 595 ptr = strchr(ptr, '@'); 596 if (ptr) 597 seg_offset = atoi(ptr+1); 598 } else if (av_strstart(line, "#", NULL)) { 599 continue; 600 } else if (line[0]) { 601 if (is_variant) { 602 if (!new_variant(c, &variant_info, line, url)) { 603 ret = AVERROR(ENOMEM); 604 goto fail; 605 } 606 is_variant = 0; 607 } 608 if (is_segment) { 609 struct segment *seg; 610 if (!pls) { 611 if (!new_variant(c, 0, url, NULL)) { 612 ret = AVERROR(ENOMEM); 613 goto fail; 614 } 615 pls = c->playlists[c->n_playlists - 1]; 616 } 617 seg = av_malloc(sizeof(struct segment)); 618 if (!seg) { 619 ret = AVERROR(ENOMEM); 620 goto fail; 621 } 622 seg->duration = duration; 623 seg->key_type = key_type; 624 if (has_iv) { 625 memcpy(seg->iv, iv, sizeof(iv)); 626 } else { 627 int seq = pls->start_seq_no + pls->n_segments; 628 memset(seg->iv, 0, sizeof(seg->iv)); 629 AV_WB32(seg->iv + 12, seq); 630 } 631 632 if (key_type != KEY_NONE) { 633 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key); 634 seg->key = av_strdup(tmp_str); 635 if (!seg->key) { 636 av_free(seg); 637 ret = AVERROR(ENOMEM); 638 goto fail; 639 } 640 } else { 641 seg->key = NULL; 642 } 643 644 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line); 645 seg->url = av_strdup(tmp_str); 646 if (!seg->url) { 647 av_free(seg->key); 648 av_free(seg); 649 ret = AVERROR(ENOMEM); 650 goto fail; 651 } 652 653 dynarray_add(&pls->segments, &pls->n_segments, seg); 654 is_segment = 0; 655 656 seg->size = seg_size; 657 if (seg_size >= 0) { 658 seg->url_offset = seg_offset; 659 seg_offset += seg_size; 660 seg_size = -1; 661 } else { 662 seg->url_offset = 0; 663 seg_offset = 0; 664 } 665 } 666 } 667 } 668 if (pls) 669 pls->last_load_time = av_gettime(); 670 671fail: 672 av_free(new_url); 673 if (close_in) 674 avio_close(in); 675 return ret; 676} 677 678enum ReadFromURLMode { 679 READ_NORMAL, 680 READ_COMPLETE, 681}; 682 683/* read from URLContext, limiting read to current segment */ 684static int read_from_url(struct playlist *pls, uint8_t *buf, int buf_size, 685 enum ReadFromURLMode mode) 686{ 687 int ret; 688 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no]; 689 690 /* limit read if the segment was only a part of a file */ 691 if (seg->size >= 0) 692 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset); 693 694 if (mode == READ_COMPLETE) 695 ret = ffurl_read_complete(pls->input, buf, buf_size); 696 else 697 ret = ffurl_read(pls->input, buf, buf_size); 698 699 if (ret > 0) 700 pls->cur_seg_offset += ret; 701 702 return ret; 703} 704 705/* Parse the raw ID3 data and pass contents to caller */ 706static void parse_id3(AVFormatContext *s, AVIOContext *pb, 707 AVDictionary **metadata, int64_t *dts, 708 ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta) 709{ 710 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp"; 711 ID3v2ExtraMeta *meta; 712 713 ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta); 714 for (meta = *extra_meta; meta; meta = meta->next) { 715 if (!strcmp(meta->tag, "PRIV")) { 716 ID3v2ExtraMetaPRIV *priv = meta->data; 717 if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) { 718 /* 33-bit MPEG timestamp */ 719 int64_t ts = AV_RB64(priv->data); 720 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts); 721 if ((ts & ~((1ULL << 33) - 1)) == 0) 722 *dts = ts; 723 else 724 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts); 725 } 726 } else if (!strcmp(meta->tag, "APIC") && apic) 727 *apic = meta->data; 728 } 729} 730 731/* Check if the ID3 metadata contents have changed */ 732static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata, 733 ID3v2ExtraMetaAPIC *apic) 734{ 735 AVDictionaryEntry *entry = NULL; 736 AVDictionaryEntry *oldentry; 737 /* check that no keys have changed values */ 738 while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) { 739 oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE); 740 if (!oldentry || strcmp(oldentry->value, entry->value) != 0) 741 return 1; 742 } 743 744 /* check if apic appeared */ 745 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data)) 746 return 1; 747 748 if (apic) { 749 int size = pls->ctx->streams[1]->attached_pic.size; 750 if (size != apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE) 751 return 1; 752 753 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0) 754 return 1; 755 } 756 757 return 0; 758} 759 760/* Parse ID3 data and handle the found data */ 761static void handle_id3(AVIOContext *pb, struct playlist *pls) 762{ 763 AVDictionary *metadata = NULL; 764 ID3v2ExtraMetaAPIC *apic = NULL; 765 ID3v2ExtraMeta *extra_meta = NULL; 766 int64_t timestamp = AV_NOPTS_VALUE; 767 768 parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta); 769 770 if (timestamp != AV_NOPTS_VALUE) { 771 pls->id3_mpegts_timestamp = timestamp; 772 pls->id3_offset = 0; 773 } 774 775 if (!pls->id3_found) { 776 /* initial ID3 tags */ 777 av_assert0(!pls->id3_deferred_extra); 778 pls->id3_found = 1; 779 780 /* get picture attachment and set text metadata */ 781 if (pls->ctx->nb_streams) 782 ff_id3v2_parse_apic(pls->ctx, &extra_meta); 783 else 784 /* demuxer not yet opened, defer picture attachment */ 785 pls->id3_deferred_extra = extra_meta; 786 787 av_dict_copy(&pls->ctx->metadata, metadata, 0); 788 pls->id3_initial = metadata; 789 790 } else { 791 if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) { 792 avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream"); 793 pls->id3_changed = 1; 794 } 795 av_dict_free(&metadata); 796 } 797 798 if (!pls->id3_deferred_extra) 799 ff_id3v2_free_extra_meta(&extra_meta); 800} 801 802/* Intercept and handle ID3 tags between URLContext and AVIOContext */ 803static void intercept_id3(struct playlist *pls, uint8_t *buf, 804 int buf_size, int *len) 805{ 806 /* intercept id3 tags, we do not want to pass them to the raw 807 * demuxer on all segment switches */ 808 int bytes; 809 int id3_buf_pos = 0; 810 int fill_buf = 0; 811 812 /* gather all the id3 tags */ 813 while (1) { 814 /* see if we can retrieve enough data for ID3 header */ 815 if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) { 816 bytes = read_from_url(pls, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE); 817 if (bytes > 0) { 818 819 if (bytes == ID3v2_HEADER_SIZE - *len) 820 /* no EOF yet, so fill the caller buffer again after 821 * we have stripped the ID3 tags */ 822 fill_buf = 1; 823 824 *len += bytes; 825 826 } else if (*len <= 0) { 827 /* error/EOF */ 828 *len = bytes; 829 fill_buf = 0; 830 } 831 } 832 833 if (*len < ID3v2_HEADER_SIZE) 834 break; 835 836 if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) { 837 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no]; 838 int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024; 839 int taglen = ff_id3v2_tag_len(buf); 840 int tag_got_bytes = FFMIN(taglen, *len); 841 int remaining = taglen - tag_got_bytes; 842 843 if (taglen > maxsize) { 844 av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n", 845 taglen, maxsize); 846 break; 847 } 848 849 /* 850 * Copy the id3 tag to our temporary id3 buffer. 851 * We could read a small id3 tag directly without memcpy, but 852 * we would still need to copy the large tags, and handling 853 * both of those cases together with the possibility for multiple 854 * tags would make the handling a bit complex. 855 */ 856 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen); 857 if (!pls->id3_buf) 858 break; 859 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes); 860 id3_buf_pos += tag_got_bytes; 861 862 /* strip the intercepted bytes */ 863 *len -= tag_got_bytes; 864 memmove(buf, buf + tag_got_bytes, *len); 865 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes); 866 867 if (remaining > 0) { 868 /* read the rest of the tag in */ 869 if (read_from_url(pls, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining) 870 break; 871 id3_buf_pos += remaining; 872 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining); 873 } 874 875 } else { 876 /* no more ID3 tags */ 877 break; 878 } 879 } 880 881 /* re-fill buffer for the caller unless EOF */ 882 if (*len >= 0 && (fill_buf || *len == 0)) { 883 bytes = read_from_url(pls, buf + *len, buf_size - *len, READ_NORMAL); 884 885 /* ignore error if we already had some data */ 886 if (bytes >= 0) 887 *len += bytes; 888 else if (*len == 0) 889 *len = bytes; 890 } 891 892 if (pls->id3_buf) { 893 /* Now parse all the ID3 tags */ 894 AVIOContext id3ioctx; 895 ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL); 896 handle_id3(&id3ioctx, pls); 897 } 898 899 if (pls->is_id3_timestamped == -1) 900 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE); 901} 902 903static int open_input(HLSContext *c, struct playlist *pls) 904{ 905 AVDictionary *opts = NULL; 906 AVDictionary *opts2 = NULL; 907 int ret; 908 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no]; 909 910 // broker prior HTTP options that should be consistent across requests 911 av_dict_set(&opts, "user-agent", c->user_agent, 0); 912 av_dict_set(&opts, "cookies", c->cookies, 0); 913 av_dict_set(&opts, "headers", c->headers, 0); 914 av_dict_set(&opts, "seekable", "0", 0); 915 916 // Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice) 917 av_dict_copy(&opts2, opts, 0); 918 919 if (seg->size >= 0) { 920 /* try to restrict the HTTP request to the part we want 921 * (if this is in fact a HTTP request) */ 922 char offset[24] = { 0 }; 923 char end_offset[24] = { 0 }; 924 snprintf(offset, sizeof(offset) - 1, "%"PRId64, 925 seg->url_offset); 926 snprintf(end_offset, sizeof(end_offset) - 1, "%"PRId64, 927 seg->url_offset + seg->size); 928 av_dict_set(&opts, "offset", offset, 0); 929 av_dict_set(&opts, "end_offset", end_offset, 0); 930 } 931 932 av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n", 933 seg->url, seg->url_offset, pls->index); 934 935 if (seg->key_type == KEY_NONE) { 936 ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ, 937 &pls->parent->interrupt_callback, &opts); 938 939 } else if (seg->key_type == KEY_AES_128) { 940 char iv[33], key[33], url[MAX_URL_SIZE]; 941 if (strcmp(seg->key, pls->key_url)) { 942 URLContext *uc; 943 if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ, 944 &pls->parent->interrupt_callback, &opts2) == 0) { 945 if (ffurl_read_complete(uc, pls->key, sizeof(pls->key)) 946 != sizeof(pls->key)) { 947 av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n", 948 seg->key); 949 } 950 ffurl_close(uc); 951 } else { 952 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n", 953 seg->key); 954 } 955 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url)); 956 } 957 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0); 958 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0); 959 iv[32] = key[32] = '\0'; 960 if (strstr(seg->url, "://")) 961 snprintf(url, sizeof(url), "crypto+%s", seg->url); 962 else 963 snprintf(url, sizeof(url), "crypto:%s", seg->url); 964 if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ, 965 &pls->parent->interrupt_callback)) < 0) 966 goto cleanup; 967 av_opt_set(pls->input->priv_data, "key", key, 0); 968 av_opt_set(pls->input->priv_data, "iv", iv, 0); 969 970 if ((ret = ffurl_connect(pls->input, &opts)) < 0) { 971 ffurl_close(pls->input); 972 pls->input = NULL; 973 goto cleanup; 974 } 975 ret = 0; 976 } 977 else 978 ret = AVERROR(ENOSYS); 979 980 /* Seek to the requested position. If this was a HTTP request, the offset 981 * should already be where want it to, but this allows e.g. local testing 982 * without a HTTP server. */ 983 if (ret == 0 && seg->key_type == KEY_NONE) { 984 int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET); 985 if (seekret < 0) { 986 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url); 987 ret = seekret; 988 ffurl_close(pls->input); 989 pls->input = NULL; 990 } 991 } 992 993cleanup: 994 av_dict_free(&opts); 995 av_dict_free(&opts2); 996 pls->cur_seg_offset = 0; 997 return ret; 998} 999 1000static int64_t default_reload_interval(struct playlist *pls) 1001{ 1002 return pls->n_segments > 0 ? 1003 pls->segments[pls->n_segments - 1]->duration : 1004 pls->target_duration; 1005} 1006 1007static int read_data(void *opaque, uint8_t *buf, int buf_size) 1008{ 1009 struct playlist *v = opaque; 1010 HLSContext *c = v->parent->priv_data; 1011 int ret, i; 1012 int just_opened = 0; 1013 1014restart: 1015 if (!v->needed) 1016 return AVERROR_EOF; 1017 1018 if (!v->input) { 1019 int64_t reload_interval; 1020 1021 /* Check that the playlist is still needed before opening a new 1022 * segment. */ 1023 if (v->ctx && v->ctx->nb_streams && 1024 v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) { 1025 v->needed = 0; 1026 for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams; 1027 i++) { 1028 if (v->parent->streams[i]->discard < AVDISCARD_ALL) 1029 v->needed = 1; 1030 } 1031 } 1032 if (!v->needed) { 1033 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n", 1034 v->index); 1035 return AVERROR_EOF; 1036 } 1037 1038 /* If this is a live stream and the reload interval has elapsed since 1039 * the last playlist reload, reload the playlists now. */ 1040 reload_interval = default_reload_interval(v); 1041 1042reload: 1043 if (!v->finished && 1044 av_gettime() - v->last_load_time >= reload_interval) { 1045 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) { 1046 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n", 1047 v->index); 1048 return ret; 1049 } 1050 /* If we need to reload the playlist again below (if 1051 * there's still no more segments), switch to a reload 1052 * interval of half the target duration. */ 1053 reload_interval = v->target_duration / 2; 1054 } 1055 if (v->cur_seq_no < v->start_seq_no) { 1056 av_log(NULL, AV_LOG_WARNING, 1057 "skipping %d segments ahead, expired from playlists\n", 1058 v->start_seq_no - v->cur_seq_no); 1059 v->cur_seq_no = v->start_seq_no; 1060 } 1061 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) { 1062 if (v->finished) 1063 return AVERROR_EOF; 1064 while (av_gettime() - v->last_load_time < reload_interval) { 1065 if (ff_check_interrupt(c->interrupt_callback)) 1066 return AVERROR_EXIT; 1067 av_usleep(100*1000); 1068 } 1069 /* Enough time has elapsed since the last reload */ 1070 goto reload; 1071 } 1072 1073 ret = open_input(c, v); 1074 if (ret < 0) { 1075 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n", 1076 v->index); 1077 return ret; 1078 } 1079 just_opened = 1; 1080 } 1081 1082 ret = read_from_url(v, buf, buf_size, READ_NORMAL); 1083 if (ret > 0) { 1084 if (just_opened && v->is_id3_timestamped != 0) { 1085 /* Intercept ID3 tags here, elementary audio streams are required 1086 * to convey timestamps using them in the beginning of each segment. */ 1087 intercept_id3(v, buf, buf_size, &ret); 1088 } 1089 1090 return ret; 1091 } 1092 ffurl_close(v->input); 1093 v->input = NULL; 1094 v->cur_seq_no++; 1095 1096 c->cur_seq_no = v->cur_seq_no; 1097 1098 goto restart; 1099} 1100 1101static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls) 1102{ 1103 int variant_count = 0; 1104 int i, j; 1105 1106 for (i = 0; i < c->n_variants && variant_count < 2; i++) { 1107 struct variant *v = c->variants[i]; 1108 1109 for (j = 0; j < v->n_playlists; j++) { 1110 if (v->playlists[j] == pls) { 1111 variant_count++; 1112 break; 1113 } 1114 } 1115 } 1116 1117 return variant_count >= 2; 1118} 1119 1120static void add_renditions_to_variant(HLSContext *c, struct variant *var, 1121 enum AVMediaType type, const char *group_id) 1122{ 1123 int i; 1124 1125 for (i = 0; i < c->n_renditions; i++) { 1126 struct rendition *rend = c->renditions[i]; 1127 1128 if (rend->type == type && !strcmp(rend->group_id, group_id)) { 1129 1130 if (rend->playlist) 1131 /* rendition is an external playlist 1132 * => add the playlist to the variant */ 1133 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist); 1134 else 1135 /* rendition is part of the variant main Media Playlist 1136 * => add the rendition to the main Media Playlist */ 1137 dynarray_add(&var->playlists[0]->renditions, 1138 &var->playlists[0]->n_renditions, 1139 rend); 1140 } 1141 } 1142} 1143 1144static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls, 1145 enum AVMediaType type) 1146{ 1147 int rend_idx = 0; 1148 int i; 1149 1150 for (i = 0; i < pls->ctx->nb_streams; i++) { 1151 AVStream *st = s->streams[pls->stream_offset + i]; 1152 1153 if (st->codec->codec_type != type) 1154 continue; 1155 1156 for (; rend_idx < pls->n_renditions; rend_idx++) { 1157 struct rendition *rend = pls->renditions[rend_idx]; 1158 1159 if (rend->type != type) 1160 continue; 1161 1162 if (rend->language[0]) 1163 av_dict_set(&st->metadata, "language", rend->language, 0); 1164 if (rend->name[0]) 1165 av_dict_set(&st->metadata, "comment", rend->name, 0); 1166 1167 st->disposition |= rend->disposition; 1168 } 1169 if (rend_idx >=pls->n_renditions) 1170 break; 1171 } 1172} 1173 1174/* if timestamp was in valid range: returns 1 and sets seq_no 1175 * if not: returns 0 and sets seq_no to closest segment */ 1176static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls, 1177 int64_t timestamp, int *seq_no) 1178{ 1179 int i; 1180 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ? 1181 0 : c->first_timestamp; 1182 1183 if (timestamp < pos) { 1184 *seq_no = pls->start_seq_no; 1185 return 0; 1186 } 1187 1188 for (i = 0; i < pls->n_segments; i++) { 1189 int64_t diff = pos + pls->segments[i]->duration - timestamp; 1190 if (diff > 0) { 1191 *seq_no = pls->start_seq_no + i; 1192 return 1; 1193 } 1194 pos += pls->segments[i]->duration; 1195 } 1196 1197 *seq_no = pls->start_seq_no + pls->n_segments - 1; 1198 1199 return 0; 1200} 1201 1202static int select_cur_seq_no(HLSContext *c, struct playlist *pls) 1203{ 1204 int seq_no; 1205 1206 if (!pls->finished && !c->first_packet && 1207 av_gettime() - pls->last_load_time >= default_reload_interval(pls)) 1208 /* reload the playlist since it was suspended */ 1209 parse_playlist(c, pls->url, pls, NULL); 1210 1211 /* If playback is already in progress (we are just selecting a new 1212 * playlist) and this is a complete file, find the matching segment 1213 * by counting durations. */ 1214 if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) { 1215 find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no); 1216 return seq_no; 1217 } 1218 1219 if (!pls->finished) { 1220 if (!c->first_packet && /* we are doing a segment selection during playback */ 1221 c->cur_seq_no >= pls->start_seq_no && 1222 c->cur_seq_no < pls->start_seq_no + pls->n_segments) 1223 /* While spec 3.4.3 says that we cannot assume anything about the 1224 * content at the same sequence number on different playlists, 1225 * in practice this seems to work and doing it otherwise would 1226 * require us to download a segment to inspect its timestamps. */ 1227 return c->cur_seq_no; 1228 1229 /* If this is a live stream with more than 3 segments, start at the 1230 * third last segment. */ 1231 if (pls->n_segments > 3) 1232 return pls->start_seq_no + pls->n_segments - 3; 1233 } 1234 1235 /* Otherwise just start on the first segment. */ 1236 return pls->start_seq_no; 1237} 1238 1239static int hls_read_header(AVFormatContext *s) 1240{ 1241 URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque; 1242 HLSContext *c = s->priv_data; 1243 int ret = 0, i, j, stream_offset = 0; 1244 1245 c->interrupt_callback = &s->interrupt_callback; 1246 1247 c->first_packet = 1; 1248 c->first_timestamp = AV_NOPTS_VALUE; 1249 c->cur_timestamp = AV_NOPTS_VALUE; 1250 1251 // if the URL context is good, read important options we must broker later 1252 if (u && u->prot->priv_data_class) { 1253 // get the previous user agent & set back to null if string size is zero 1254 av_freep(&c->user_agent); 1255 av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent)); 1256 if (c->user_agent && !strlen(c->user_agent)) 1257 av_freep(&c->user_agent); 1258 1259 // get the previous cookies & set back to null if string size is zero 1260 av_freep(&c->cookies); 1261 av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies)); 1262 if (c->cookies && !strlen(c->cookies)) 1263 av_freep(&c->cookies); 1264 1265 // get the previous headers & set back to null if string size is zero 1266 av_freep(&c->headers); 1267 av_opt_get(u->priv_data, "headers", 0, (uint8_t**)&(c->headers)); 1268 if (c->headers && !strlen(c->headers)) 1269 av_freep(&c->headers); 1270 } 1271 1272 if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0) 1273 goto fail; 1274 1275 if (c->n_variants == 0) { 1276 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); 1277 ret = AVERROR_EOF; 1278 goto fail; 1279 } 1280 /* If the playlist only contained playlists (Master Playlist), 1281 * parse each individual playlist. */ 1282 if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) { 1283 for (i = 0; i < c->n_playlists; i++) { 1284 struct playlist *pls = c->playlists[i]; 1285 if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) 1286 goto fail; 1287 } 1288 } 1289 1290 if (c->variants[0]->playlists[0]->n_segments == 0) { 1291 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); 1292 ret = AVERROR_EOF; 1293 goto fail; 1294 } 1295 1296 /* If this isn't a live stream, calculate the total duration of the 1297 * stream. */ 1298 if (c->variants[0]->playlists[0]->finished) { 1299 int64_t duration = 0; 1300 for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++) 1301 duration += c->variants[0]->playlists[0]->segments[i]->duration; 1302 s->duration = duration; 1303 } 1304 1305 /* Associate renditions with variants */ 1306 for (i = 0; i < c->n_variants; i++) { 1307 struct variant *var = c->variants[i]; 1308 1309 if (var->audio_group[0]) 1310 add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group); 1311 if (var->video_group[0]) 1312 add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group); 1313 if (var->subtitles_group[0]) 1314 add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group); 1315 } 1316 1317 /* Open the demuxer for each playlist */ 1318 for (i = 0; i < c->n_playlists; i++) { 1319 struct playlist *pls = c->playlists[i]; 1320 AVInputFormat *in_fmt = NULL; 1321 1322 if (pls->n_segments == 0) 1323 continue; 1324 1325 if (!(pls->ctx = avformat_alloc_context())) { 1326 ret = AVERROR(ENOMEM); 1327 goto fail; 1328 } 1329 1330 pls->index = i; 1331 pls->needed = 1; 1332 pls->parent = s; 1333 pls->cur_seq_no = select_cur_seq_no(c, pls); 1334 1335 pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE); 1336 ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls, 1337 read_data, NULL, NULL); 1338 pls->pb.seekable = 0; 1339 ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url, 1340 NULL, 0, 0); 1341 if (ret < 0) { 1342 /* Free the ctx - it isn't initialized properly at this point, 1343 * so avformat_close_input shouldn't be called. If 1344 * avformat_open_input fails below, it frees and zeros the 1345 * context, so it doesn't need any special treatment like this. */ 1346 av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url); 1347 avformat_free_context(pls->ctx); 1348 pls->ctx = NULL; 1349 goto fail; 1350 } 1351 pls->ctx->pb = &pls->pb; 1352 pls->stream_offset = stream_offset; 1353 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL); 1354 if (ret < 0) 1355 goto fail; 1356 1357 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) { 1358 ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra); 1359 avformat_queue_attached_pictures(pls->ctx); 1360 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra); 1361 pls->id3_deferred_extra = NULL; 1362 } 1363 1364 pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER; 1365 ret = avformat_find_stream_info(pls->ctx, NULL); 1366 if (ret < 0) 1367 goto fail; 1368 1369 if (pls->is_id3_timestamped == -1) 1370 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n"); 1371 1372 /* Create new AVStreams for each stream in this playlist */ 1373 for (j = 0; j < pls->ctx->nb_streams; j++) { 1374 AVStream *st = avformat_new_stream(s, NULL); 1375 AVStream *ist = pls->ctx->streams[j]; 1376 if (!st) { 1377 ret = AVERROR(ENOMEM); 1378 goto fail; 1379 } 1380 st->id = i; 1381 1382 avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec); 1383 1384 if (pls->is_id3_timestamped) /* custom timestamps via id3 */ 1385 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE); 1386 else 1387 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); 1388 } 1389 1390 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO); 1391 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO); 1392 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE); 1393 1394 stream_offset += pls->ctx->nb_streams; 1395 } 1396 1397 /* Create a program for each variant */ 1398 for (i = 0; i < c->n_variants; i++) { 1399 struct variant *v = c->variants[i]; 1400 char bitrate_str[20]; 1401 AVProgram *program; 1402 1403 snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth); 1404 1405 program = av_new_program(s, i); 1406 if (!program) 1407 goto fail; 1408 av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0); 1409 1410 for (j = 0; j < v->n_playlists; j++) { 1411 struct playlist *pls = v->playlists[j]; 1412 int is_shared = playlist_in_multiple_variants(c, pls); 1413 int k; 1414 1415 for (k = 0; k < pls->ctx->nb_streams; k++) { 1416 struct AVStream *st = s->streams[pls->stream_offset + k]; 1417 1418 ff_program_add_stream_index(s, i, pls->stream_offset + k); 1419 1420 /* Set variant_bitrate for streams unique to this variant */ 1421 if (!is_shared && v->bandwidth) 1422 av_dict_set(&st->metadata, "variant_bitrate", bitrate_str, 0); 1423 } 1424 } 1425 } 1426 1427 return 0; 1428fail: 1429 free_playlist_list(c); 1430 free_variant_list(c); 1431 free_rendition_list(c); 1432 return ret; 1433} 1434 1435static int recheck_discard_flags(AVFormatContext *s, int first) 1436{ 1437 HLSContext *c = s->priv_data; 1438 int i, changed = 0; 1439 1440 /* Check if any new streams are needed */ 1441 for (i = 0; i < c->n_playlists; i++) 1442 c->playlists[i]->cur_needed = 0; 1443 1444 for (i = 0; i < s->nb_streams; i++) { 1445 AVStream *st = s->streams[i]; 1446 struct playlist *pls = c->playlists[s->streams[i]->id]; 1447 if (st->discard < AVDISCARD_ALL) 1448 pls->cur_needed = 1; 1449 } 1450 for (i = 0; i < c->n_playlists; i++) { 1451 struct playlist *pls = c->playlists[i]; 1452 if (pls->cur_needed && !pls->needed) { 1453 pls->needed = 1; 1454 changed = 1; 1455 pls->cur_seq_no = select_cur_seq_no(c, pls); 1456 pls->pb.eof_reached = 0; 1457 if (c->cur_timestamp != AV_NOPTS_VALUE) { 1458 /* catch up */ 1459 pls->seek_timestamp = c->cur_timestamp; 1460 pls->seek_flags = AVSEEK_FLAG_ANY; 1461 pls->seek_stream_index = -1; 1462 } 1463 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no); 1464 } else if (first && !pls->cur_needed && pls->needed) { 1465 if (pls->input) 1466 ffurl_close(pls->input); 1467 pls->input = NULL; 1468 pls->needed = 0; 1469 changed = 1; 1470 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i); 1471 } 1472 } 1473 return changed; 1474} 1475 1476static void fill_timing_for_id3_timestamped_stream(struct playlist *pls) 1477{ 1478 if (pls->id3_offset >= 0) { 1479 pls->pkt.dts = pls->id3_mpegts_timestamp + 1480 av_rescale_q(pls->id3_offset, 1481 pls->ctx->streams[pls->pkt.stream_index]->time_base, 1482 MPEG_TIME_BASE_Q); 1483 if (pls->pkt.duration) 1484 pls->id3_offset += pls->pkt.duration; 1485 else 1486 pls->id3_offset = -1; 1487 } else { 1488 /* there have been packets with unknown duration 1489 * since the last id3 tag, should not normally happen */ 1490 pls->pkt.dts = AV_NOPTS_VALUE; 1491 } 1492 1493 if (pls->pkt.duration) 1494 pls->pkt.duration = av_rescale_q(pls->pkt.duration, 1495 pls->ctx->streams[pls->pkt.stream_index]->time_base, 1496 MPEG_TIME_BASE_Q); 1497 1498 pls->pkt.pts = AV_NOPTS_VALUE; 1499} 1500 1501static AVRational get_timebase(struct playlist *pls) 1502{ 1503 if (pls->is_id3_timestamped) 1504 return MPEG_TIME_BASE_Q; 1505 1506 return pls->ctx->streams[pls->pkt.stream_index]->time_base; 1507} 1508 1509static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a, 1510 int64_t ts_b, struct playlist *pls_b) 1511{ 1512 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q); 1513 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q); 1514 1515 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33); 1516} 1517 1518static int hls_read_packet(AVFormatContext *s, AVPacket *pkt) 1519{ 1520 HLSContext *c = s->priv_data; 1521 int ret, i, minplaylist = -1; 1522 1523 recheck_discard_flags(s, c->first_packet); 1524 1525 for (i = 0; i < c->n_playlists; i++) { 1526 struct playlist *pls = c->playlists[i]; 1527 /* Make sure we've got one buffered packet from each open playlist 1528 * stream */ 1529 if (pls->needed && !pls->pkt.data) { 1530 while (1) { 1531 int64_t ts_diff; 1532 AVRational tb; 1533 ret = av_read_frame(pls->ctx, &pls->pkt); 1534 if (ret < 0) { 1535 if (!url_feof(&pls->pb) && ret != AVERROR_EOF) 1536 return ret; 1537 reset_packet(&pls->pkt); 1538 break; 1539 } else { 1540 /* stream_index check prevents matching picture attachments etc. */ 1541 if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) { 1542 /* audio elementary streams are id3 timestamped */ 1543 fill_timing_for_id3_timestamped_stream(pls); 1544 } 1545 1546 if (c->first_timestamp == AV_NOPTS_VALUE && 1547 pls->pkt.dts != AV_NOPTS_VALUE) 1548 c->first_timestamp = av_rescale_q(pls->pkt.dts, 1549 get_timebase(pls), AV_TIME_BASE_Q); 1550 } 1551 1552 if (pls->seek_timestamp == AV_NOPTS_VALUE) 1553 break; 1554 1555 if (pls->seek_stream_index < 0 || 1556 pls->seek_stream_index == pls->pkt.stream_index) { 1557 1558 if (pls->pkt.dts == AV_NOPTS_VALUE) { 1559 pls->seek_timestamp = AV_NOPTS_VALUE; 1560 break; 1561 } 1562 1563 tb = get_timebase(pls); 1564 ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE, 1565 tb.den, AV_ROUND_DOWN) - 1566 pls->seek_timestamp; 1567 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY || 1568 pls->pkt.flags & AV_PKT_FLAG_KEY)) { 1569 pls->seek_timestamp = AV_NOPTS_VALUE; 1570 break; 1571 } 1572 } 1573 av_free_packet(&pls->pkt); 1574 reset_packet(&pls->pkt); 1575 } 1576 } 1577 /* Check if this stream has the packet with the lowest dts */ 1578 if (pls->pkt.data) { 1579 struct playlist *minpls = minplaylist < 0 ? 1580 NULL : c->playlists[minplaylist]; 1581 if (minplaylist < 0) { 1582 minplaylist = i; 1583 } else { 1584 int64_t dts = pls->pkt.dts; 1585 int64_t mindts = minpls->pkt.dts; 1586 1587 if (dts == AV_NOPTS_VALUE || 1588 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0)) 1589 minplaylist = i; 1590 } 1591 } 1592 } 1593 1594 /* If we got a packet, return it */ 1595 if (minplaylist >= 0) { 1596 struct playlist *pls = c->playlists[minplaylist]; 1597 *pkt = pls->pkt; 1598 pkt->stream_index += pls->stream_offset; 1599 reset_packet(&c->playlists[minplaylist]->pkt); 1600 1601 if (pkt->dts != AV_NOPTS_VALUE) 1602 c->cur_timestamp = av_rescale_q(pkt->dts, 1603 pls->ctx->streams[pls->pkt.stream_index]->time_base, 1604 AV_TIME_BASE_Q); 1605 1606 return 0; 1607 } 1608 return AVERROR_EOF; 1609} 1610 1611static int hls_close(AVFormatContext *s) 1612{ 1613 HLSContext *c = s->priv_data; 1614 1615 free_playlist_list(c); 1616 free_variant_list(c); 1617 free_rendition_list(c); 1618 return 0; 1619} 1620 1621static int hls_read_seek(AVFormatContext *s, int stream_index, 1622 int64_t timestamp, int flags) 1623{ 1624 HLSContext *c = s->priv_data; 1625 struct playlist *seek_pls = NULL; 1626 int i, seq_no; 1627 int64_t first_timestamp, seek_timestamp, duration; 1628 1629 if ((flags & AVSEEK_FLAG_BYTE) || 1630 !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT)) 1631 return AVERROR(ENOSYS); 1632 1633 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ? 1634 0 : c->first_timestamp; 1635 1636 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, 1637 s->streams[stream_index]->time_base.den, 1638 flags & AVSEEK_FLAG_BACKWARD ? 1639 AV_ROUND_DOWN : AV_ROUND_UP); 1640 1641 duration = s->duration == AV_NOPTS_VALUE ? 1642 0 : s->duration; 1643 1644 if (0 < duration && duration < seek_timestamp - first_timestamp) 1645 return AVERROR(EIO); 1646 1647 /* find the playlist with the specified stream */ 1648 for (i = 0; i < c->n_playlists; i++) { 1649 struct playlist *pls = c->playlists[i]; 1650 if (stream_index >= pls->stream_offset && 1651 stream_index - pls->stream_offset < pls->ctx->nb_streams) { 1652 seek_pls = pls; 1653 break; 1654 } 1655 } 1656 /* check if the timestamp is valid for the playlist with the 1657 * specified stream index */ 1658 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no)) 1659 return AVERROR(EIO); 1660 1661 /* set segment now so we do not need to search again below */ 1662 seek_pls->cur_seq_no = seq_no; 1663 seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset; 1664 1665 for (i = 0; i < c->n_playlists; i++) { 1666 /* Reset reading */ 1667 struct playlist *pls = c->playlists[i]; 1668 if (pls->input) { 1669 ffurl_close(pls->input); 1670 pls->input = NULL; 1671 } 1672 av_free_packet(&pls->pkt); 1673 reset_packet(&pls->pkt); 1674 pls->pb.eof_reached = 0; 1675 /* Clear any buffered data */ 1676 pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer; 1677 /* Reset the pos, to let the mpegts demuxer know we've seeked. */ 1678 pls->pb.pos = 0; 1679 /* Flush the packet queue of the subdemuxer. */ 1680 ff_read_frame_flush(pls->ctx); 1681 1682 pls->seek_timestamp = seek_timestamp; 1683 pls->seek_flags = flags; 1684 1685 if (pls != seek_pls) { 1686 /* set closest segment seq_no for playlists not handled above */ 1687 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no); 1688 /* seek the playlist to the given position without taking 1689 * keyframes into account since this playlist does not have the 1690 * specified stream where we should look for the keyframes */ 1691 pls->seek_stream_index = -1; 1692 pls->seek_flags |= AVSEEK_FLAG_ANY; 1693 } 1694 } 1695 1696 c->cur_timestamp = seek_timestamp; 1697 1698 return 0; 1699} 1700 1701static int hls_probe(AVProbeData *p) 1702{ 1703 /* Require #EXTM3U at the start, and either one of the ones below 1704 * somewhere for a proper match. */ 1705 if (strncmp(p->buf, "#EXTM3U", 7)) 1706 return 0; 1707 if (strstr(p->buf, "#EXT-X-STREAM-INF:") || 1708 strstr(p->buf, "#EXT-X-TARGETDURATION:") || 1709 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:")) 1710 return AVPROBE_SCORE_MAX; 1711 return 0; 1712} 1713 1714AVInputFormat ff_hls_demuxer = { 1715 .name = "hls,applehttp", 1716 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), 1717 .priv_data_size = sizeof(HLSContext), 1718 .read_probe = hls_probe, 1719 .read_header = hls_read_header, 1720 .read_packet = hls_read_packet, 1721 .read_close = hls_close, 1722 .read_seek = hls_read_seek, 1723}; 1724