| 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 | |
| 62 | enum KeyType { |
| 63 | KEY_NONE, |
| 64 | KEY_AES_128, |
| 65 | }; |
| 66 | |
| 67 | struct 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 | |
| 77 | struct rendition; |
| 78 | |
| 79 | enum 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 | */ |
| 90 | struct 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 | */ |
| 145 | struct 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 | |
| 154 | struct 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 | |
| 166 | typedef 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 | |
| 184 | static 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 | |
| 192 | static 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 | |
| 204 | static 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 | |
| 230 | static 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 | |
| 242 | static 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 | */ |
| 255 | static void reset_packet(AVPacket *pkt) |
| 256 | { |
| 257 | av_init_packet(pkt); |
| 258 | pkt->data = NULL; |
| 259 | } |
| 260 | |
| 261 | static 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 | |
| 278 | struct 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 | |
| 286 | static 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 | |
| 312 | static 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 | |
| 330 | struct key_info { |
| 331 | char uri[MAX_URL_SIZE]; |
| 332 | char method[10]; |
| 333 | char iv[35]; |
| 334 | }; |
| 335 | |
| 336 | static 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 | |
| 351 | struct 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 | |
| 363 | static 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 | |
| 440 | static 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) */ |
| 482 | static 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 */ |
| 494 | static 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 (!avio_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 | |
| 671 | fail: |
| 672 | av_free(new_url); |
| 673 | if (close_in) |
| 674 | avio_close(in); |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | enum ReadFromURLMode { |
| 679 | READ_NORMAL, |
| 680 | READ_COMPLETE, |
| 681 | }; |
| 682 | |
| 683 | /* read from URLContext, limiting read to current segment */ |
| 684 | static 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 */ |
| 706 | static 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 */ |
| 732 | static 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 */ |
| 761 | static 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 */ |
| 803 | static 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 | |
| 903 | static 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 | av_dict_set_int(&opts, "offset", seg->url_offset, 0); |
| 923 | av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0); |
| 924 | } |
| 925 | |
| 926 | av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n", |
| 927 | seg->url, seg->url_offset, pls->index); |
| 928 | |
| 929 | if (seg->key_type == KEY_NONE) { |
| 930 | ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ, |
| 931 | &pls->parent->interrupt_callback, &opts); |
| 932 | |
| 933 | } else if (seg->key_type == KEY_AES_128) { |
| 934 | char iv[33], key[33], url[MAX_URL_SIZE]; |
| 935 | if (strcmp(seg->key, pls->key_url)) { |
| 936 | URLContext *uc; |
| 937 | if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ, |
| 938 | &pls->parent->interrupt_callback, &opts2) == 0) { |
| 939 | if (ffurl_read_complete(uc, pls->key, sizeof(pls->key)) |
| 940 | != sizeof(pls->key)) { |
| 941 | av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n", |
| 942 | seg->key); |
| 943 | } |
| 944 | ffurl_close(uc); |
| 945 | } else { |
| 946 | av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n", |
| 947 | seg->key); |
| 948 | } |
| 949 | av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url)); |
| 950 | } |
| 951 | ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0); |
| 952 | ff_data_to_hex(key, pls->key, sizeof(pls->key), 0); |
| 953 | iv[32] = key[32] = '\0'; |
| 954 | if (strstr(seg->url, "://")) |
| 955 | snprintf(url, sizeof(url), "crypto+%s", seg->url); |
| 956 | else |
| 957 | snprintf(url, sizeof(url), "crypto:%s", seg->url); |
| 958 | if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ, |
| 959 | &pls->parent->interrupt_callback)) < 0) |
| 960 | goto cleanup; |
| 961 | av_opt_set(pls->input->priv_data, "key", key, 0); |
| 962 | av_opt_set(pls->input->priv_data, "iv", iv, 0); |
| 963 | |
| 964 | if ((ret = ffurl_connect(pls->input, &opts)) < 0) { |
| 965 | ffurl_close(pls->input); |
| 966 | pls->input = NULL; |
| 967 | goto cleanup; |
| 968 | } |
| 969 | ret = 0; |
| 970 | } |
| 971 | else |
| 972 | ret = AVERROR(ENOSYS); |
| 973 | |
| 974 | /* Seek to the requested position. If this was a HTTP request, the offset |
| 975 | * should already be where want it to, but this allows e.g. local testing |
| 976 | * without a HTTP server. */ |
| 977 | if (ret == 0 && seg->key_type == KEY_NONE) { |
| 978 | int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET); |
| 979 | if (seekret < 0) { |
| 980 | av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url); |
| 981 | ret = seekret; |
| 982 | ffurl_close(pls->input); |
| 983 | pls->input = NULL; |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | cleanup: |
| 988 | av_dict_free(&opts); |
| 989 | av_dict_free(&opts2); |
| 990 | pls->cur_seg_offset = 0; |
| 991 | return ret; |
| 992 | } |
| 993 | |
| 994 | static int64_t default_reload_interval(struct playlist *pls) |
| 995 | { |
| 996 | return pls->n_segments > 0 ? |
| 997 | pls->segments[pls->n_segments - 1]->duration : |
| 998 | pls->target_duration; |
| 999 | } |
| 1000 | |
| 1001 | static int read_data(void *opaque, uint8_t *buf, int buf_size) |
| 1002 | { |
| 1003 | struct playlist *v = opaque; |
| 1004 | HLSContext *c = v->parent->priv_data; |
| 1005 | int ret, i; |
| 1006 | int just_opened = 0; |
| 1007 | |
| 1008 | restart: |
| 1009 | if (!v->needed) |
| 1010 | return AVERROR_EOF; |
| 1011 | |
| 1012 | if (!v->input) { |
| 1013 | int64_t reload_interval; |
| 1014 | |
| 1015 | /* Check that the playlist is still needed before opening a new |
| 1016 | * segment. */ |
| 1017 | if (v->ctx && v->ctx->nb_streams && |
| 1018 | v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) { |
| 1019 | v->needed = 0; |
| 1020 | for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams; |
| 1021 | i++) { |
| 1022 | if (v->parent->streams[i]->discard < AVDISCARD_ALL) |
| 1023 | v->needed = 1; |
| 1024 | } |
| 1025 | } |
| 1026 | if (!v->needed) { |
| 1027 | av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n", |
| 1028 | v->index); |
| 1029 | return AVERROR_EOF; |
| 1030 | } |
| 1031 | |
| 1032 | /* If this is a live stream and the reload interval has elapsed since |
| 1033 | * the last playlist reload, reload the playlists now. */ |
| 1034 | reload_interval = default_reload_interval(v); |
| 1035 | |
| 1036 | reload: |
| 1037 | if (!v->finished && |
| 1038 | av_gettime() - v->last_load_time >= reload_interval) { |
| 1039 | if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) { |
| 1040 | av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n", |
| 1041 | v->index); |
| 1042 | return ret; |
| 1043 | } |
| 1044 | /* If we need to reload the playlist again below (if |
| 1045 | * there's still no more segments), switch to a reload |
| 1046 | * interval of half the target duration. */ |
| 1047 | reload_interval = v->target_duration / 2; |
| 1048 | } |
| 1049 | if (v->cur_seq_no < v->start_seq_no) { |
| 1050 | av_log(NULL, AV_LOG_WARNING, |
| 1051 | "skipping %d segments ahead, expired from playlists\n", |
| 1052 | v->start_seq_no - v->cur_seq_no); |
| 1053 | v->cur_seq_no = v->start_seq_no; |
| 1054 | } |
| 1055 | if (v->cur_seq_no >= v->start_seq_no + v->n_segments) { |
| 1056 | if (v->finished) |
| 1057 | return AVERROR_EOF; |
| 1058 | while (av_gettime() - v->last_load_time < reload_interval) { |
| 1059 | if (ff_check_interrupt(c->interrupt_callback)) |
| 1060 | return AVERROR_EXIT; |
| 1061 | av_usleep(100*1000); |
| 1062 | } |
| 1063 | /* Enough time has elapsed since the last reload */ |
| 1064 | goto reload; |
| 1065 | } |
| 1066 | |
| 1067 | ret = open_input(c, v); |
| 1068 | if (ret < 0) { |
| 1069 | av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n", |
| 1070 | v->index); |
| 1071 | return ret; |
| 1072 | } |
| 1073 | just_opened = 1; |
| 1074 | } |
| 1075 | |
| 1076 | ret = read_from_url(v, buf, buf_size, READ_NORMAL); |
| 1077 | if (ret > 0) { |
| 1078 | if (just_opened && v->is_id3_timestamped != 0) { |
| 1079 | /* Intercept ID3 tags here, elementary audio streams are required |
| 1080 | * to convey timestamps using them in the beginning of each segment. */ |
| 1081 | intercept_id3(v, buf, buf_size, &ret); |
| 1082 | } |
| 1083 | |
| 1084 | return ret; |
| 1085 | } |
| 1086 | ffurl_close(v->input); |
| 1087 | v->input = NULL; |
| 1088 | v->cur_seq_no++; |
| 1089 | |
| 1090 | c->cur_seq_no = v->cur_seq_no; |
| 1091 | |
| 1092 | goto restart; |
| 1093 | } |
| 1094 | |
| 1095 | static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls) |
| 1096 | { |
| 1097 | int variant_count = 0; |
| 1098 | int i, j; |
| 1099 | |
| 1100 | for (i = 0; i < c->n_variants && variant_count < 2; i++) { |
| 1101 | struct variant *v = c->variants[i]; |
| 1102 | |
| 1103 | for (j = 0; j < v->n_playlists; j++) { |
| 1104 | if (v->playlists[j] == pls) { |
| 1105 | variant_count++; |
| 1106 | break; |
| 1107 | } |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | return variant_count >= 2; |
| 1112 | } |
| 1113 | |
| 1114 | static void add_renditions_to_variant(HLSContext *c, struct variant *var, |
| 1115 | enum AVMediaType type, const char *group_id) |
| 1116 | { |
| 1117 | int i; |
| 1118 | |
| 1119 | for (i = 0; i < c->n_renditions; i++) { |
| 1120 | struct rendition *rend = c->renditions[i]; |
| 1121 | |
| 1122 | if (rend->type == type && !strcmp(rend->group_id, group_id)) { |
| 1123 | |
| 1124 | if (rend->playlist) |
| 1125 | /* rendition is an external playlist |
| 1126 | * => add the playlist to the variant */ |
| 1127 | dynarray_add(&var->playlists, &var->n_playlists, rend->playlist); |
| 1128 | else |
| 1129 | /* rendition is part of the variant main Media Playlist |
| 1130 | * => add the rendition to the main Media Playlist */ |
| 1131 | dynarray_add(&var->playlists[0]->renditions, |
| 1132 | &var->playlists[0]->n_renditions, |
| 1133 | rend); |
| 1134 | } |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls, |
| 1139 | enum AVMediaType type) |
| 1140 | { |
| 1141 | int rend_idx = 0; |
| 1142 | int i; |
| 1143 | |
| 1144 | for (i = 0; i < pls->ctx->nb_streams; i++) { |
| 1145 | AVStream *st = s->streams[pls->stream_offset + i]; |
| 1146 | |
| 1147 | if (st->codec->codec_type != type) |
| 1148 | continue; |
| 1149 | |
| 1150 | for (; rend_idx < pls->n_renditions; rend_idx++) { |
| 1151 | struct rendition *rend = pls->renditions[rend_idx]; |
| 1152 | |
| 1153 | if (rend->type != type) |
| 1154 | continue; |
| 1155 | |
| 1156 | if (rend->language[0]) |
| 1157 | av_dict_set(&st->metadata, "language", rend->language, 0); |
| 1158 | if (rend->name[0]) |
| 1159 | av_dict_set(&st->metadata, "comment", rend->name, 0); |
| 1160 | |
| 1161 | st->disposition |= rend->disposition; |
| 1162 | } |
| 1163 | if (rend_idx >=pls->n_renditions) |
| 1164 | break; |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | /* if timestamp was in valid range: returns 1 and sets seq_no |
| 1169 | * if not: returns 0 and sets seq_no to closest segment */ |
| 1170 | static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls, |
| 1171 | int64_t timestamp, int *seq_no) |
| 1172 | { |
| 1173 | int i; |
| 1174 | int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ? |
| 1175 | 0 : c->first_timestamp; |
| 1176 | |
| 1177 | if (timestamp < pos) { |
| 1178 | *seq_no = pls->start_seq_no; |
| 1179 | return 0; |
| 1180 | } |
| 1181 | |
| 1182 | for (i = 0; i < pls->n_segments; i++) { |
| 1183 | int64_t diff = pos + pls->segments[i]->duration - timestamp; |
| 1184 | if (diff > 0) { |
| 1185 | *seq_no = pls->start_seq_no + i; |
| 1186 | return 1; |
| 1187 | } |
| 1188 | pos += pls->segments[i]->duration; |
| 1189 | } |
| 1190 | |
| 1191 | *seq_no = pls->start_seq_no + pls->n_segments - 1; |
| 1192 | |
| 1193 | return 0; |
| 1194 | } |
| 1195 | |
| 1196 | static int select_cur_seq_no(HLSContext *c, struct playlist *pls) |
| 1197 | { |
| 1198 | int seq_no; |
| 1199 | |
| 1200 | if (!pls->finished && !c->first_packet && |
| 1201 | av_gettime() - pls->last_load_time >= default_reload_interval(pls)) |
| 1202 | /* reload the playlist since it was suspended */ |
| 1203 | parse_playlist(c, pls->url, pls, NULL); |
| 1204 | |
| 1205 | /* If playback is already in progress (we are just selecting a new |
| 1206 | * playlist) and this is a complete file, find the matching segment |
| 1207 | * by counting durations. */ |
| 1208 | if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) { |
| 1209 | find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no); |
| 1210 | return seq_no; |
| 1211 | } |
| 1212 | |
| 1213 | if (!pls->finished) { |
| 1214 | if (!c->first_packet && /* we are doing a segment selection during playback */ |
| 1215 | c->cur_seq_no >= pls->start_seq_no && |
| 1216 | c->cur_seq_no < pls->start_seq_no + pls->n_segments) |
| 1217 | /* While spec 3.4.3 says that we cannot assume anything about the |
| 1218 | * content at the same sequence number on different playlists, |
| 1219 | * in practice this seems to work and doing it otherwise would |
| 1220 | * require us to download a segment to inspect its timestamps. */ |
| 1221 | return c->cur_seq_no; |
| 1222 | |
| 1223 | /* If this is a live stream with more than 3 segments, start at the |
| 1224 | * third last segment. */ |
| 1225 | if (pls->n_segments > 3) |
| 1226 | return pls->start_seq_no + pls->n_segments - 3; |
| 1227 | } |
| 1228 | |
| 1229 | /* Otherwise just start on the first segment. */ |
| 1230 | return pls->start_seq_no; |
| 1231 | } |
| 1232 | |
| 1233 | static int hls_read_header(AVFormatContext *s) |
| 1234 | { |
| 1235 | URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque; |
| 1236 | HLSContext *c = s->priv_data; |
| 1237 | int ret = 0, i, j, stream_offset = 0; |
| 1238 | |
| 1239 | c->interrupt_callback = &s->interrupt_callback; |
| 1240 | |
| 1241 | c->first_packet = 1; |
| 1242 | c->first_timestamp = AV_NOPTS_VALUE; |
| 1243 | c->cur_timestamp = AV_NOPTS_VALUE; |
| 1244 | |
| 1245 | // if the URL context is good, read important options we must broker later |
| 1246 | if (u && u->prot->priv_data_class) { |
| 1247 | // get the previous user agent & set back to null if string size is zero |
| 1248 | av_freep(&c->user_agent); |
| 1249 | av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent)); |
| 1250 | if (c->user_agent && !strlen(c->user_agent)) |
| 1251 | av_freep(&c->user_agent); |
| 1252 | |
| 1253 | // get the previous cookies & set back to null if string size is zero |
| 1254 | av_freep(&c->cookies); |
| 1255 | av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies)); |
| 1256 | if (c->cookies && !strlen(c->cookies)) |
| 1257 | av_freep(&c->cookies); |
| 1258 | |
| 1259 | // get the previous headers & set back to null if string size is zero |
| 1260 | av_freep(&c->headers); |
| 1261 | av_opt_get(u->priv_data, "headers", 0, (uint8_t**)&(c->headers)); |
| 1262 | if (c->headers && !strlen(c->headers)) |
| 1263 | av_freep(&c->headers); |
| 1264 | } |
| 1265 | |
| 1266 | if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0) |
| 1267 | goto fail; |
| 1268 | |
| 1269 | if (c->n_variants == 0) { |
| 1270 | av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); |
| 1271 | ret = AVERROR_EOF; |
| 1272 | goto fail; |
| 1273 | } |
| 1274 | /* If the playlist only contained playlists (Master Playlist), |
| 1275 | * parse each individual playlist. */ |
| 1276 | if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) { |
| 1277 | for (i = 0; i < c->n_playlists; i++) { |
| 1278 | struct playlist *pls = c->playlists[i]; |
| 1279 | if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) |
| 1280 | goto fail; |
| 1281 | } |
| 1282 | } |
| 1283 | |
| 1284 | if (c->variants[0]->playlists[0]->n_segments == 0) { |
| 1285 | av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); |
| 1286 | ret = AVERROR_EOF; |
| 1287 | goto fail; |
| 1288 | } |
| 1289 | |
| 1290 | /* If this isn't a live stream, calculate the total duration of the |
| 1291 | * stream. */ |
| 1292 | if (c->variants[0]->playlists[0]->finished) { |
| 1293 | int64_t duration = 0; |
| 1294 | for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++) |
| 1295 | duration += c->variants[0]->playlists[0]->segments[i]->duration; |
| 1296 | s->duration = duration; |
| 1297 | } |
| 1298 | |
| 1299 | /* Associate renditions with variants */ |
| 1300 | for (i = 0; i < c->n_variants; i++) { |
| 1301 | struct variant *var = c->variants[i]; |
| 1302 | |
| 1303 | if (var->audio_group[0]) |
| 1304 | add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group); |
| 1305 | if (var->video_group[0]) |
| 1306 | add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group); |
| 1307 | if (var->subtitles_group[0]) |
| 1308 | add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group); |
| 1309 | } |
| 1310 | |
| 1311 | /* Open the demuxer for each playlist */ |
| 1312 | for (i = 0; i < c->n_playlists; i++) { |
| 1313 | struct playlist *pls = c->playlists[i]; |
| 1314 | AVInputFormat *in_fmt = NULL; |
| 1315 | |
| 1316 | if (pls->n_segments == 0) |
| 1317 | continue; |
| 1318 | |
| 1319 | if (!(pls->ctx = avformat_alloc_context())) { |
| 1320 | ret = AVERROR(ENOMEM); |
| 1321 | goto fail; |
| 1322 | } |
| 1323 | |
| 1324 | pls->index = i; |
| 1325 | pls->needed = 1; |
| 1326 | pls->parent = s; |
| 1327 | pls->cur_seq_no = select_cur_seq_no(c, pls); |
| 1328 | |
| 1329 | pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE); |
| 1330 | ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls, |
| 1331 | read_data, NULL, NULL); |
| 1332 | pls->pb.seekable = 0; |
| 1333 | ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url, |
| 1334 | NULL, 0, 0); |
| 1335 | if (ret < 0) { |
| 1336 | /* Free the ctx - it isn't initialized properly at this point, |
| 1337 | * so avformat_close_input shouldn't be called. If |
| 1338 | * avformat_open_input fails below, it frees and zeros the |
| 1339 | * context, so it doesn't need any special treatment like this. */ |
| 1340 | av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url); |
| 1341 | avformat_free_context(pls->ctx); |
| 1342 | pls->ctx = NULL; |
| 1343 | goto fail; |
| 1344 | } |
| 1345 | pls->ctx->pb = &pls->pb; |
| 1346 | pls->stream_offset = stream_offset; |
| 1347 | ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL); |
| 1348 | if (ret < 0) |
| 1349 | goto fail; |
| 1350 | |
| 1351 | if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) { |
| 1352 | ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra); |
| 1353 | avformat_queue_attached_pictures(pls->ctx); |
| 1354 | ff_id3v2_free_extra_meta(&pls->id3_deferred_extra); |
| 1355 | pls->id3_deferred_extra = NULL; |
| 1356 | } |
| 1357 | |
| 1358 | pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER; |
| 1359 | ret = avformat_find_stream_info(pls->ctx, NULL); |
| 1360 | if (ret < 0) |
| 1361 | goto fail; |
| 1362 | |
| 1363 | if (pls->is_id3_timestamped == -1) |
| 1364 | av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n"); |
| 1365 | |
| 1366 | /* Create new AVStreams for each stream in this playlist */ |
| 1367 | for (j = 0; j < pls->ctx->nb_streams; j++) { |
| 1368 | AVStream *st = avformat_new_stream(s, NULL); |
| 1369 | AVStream *ist = pls->ctx->streams[j]; |
| 1370 | if (!st) { |
| 1371 | ret = AVERROR(ENOMEM); |
| 1372 | goto fail; |
| 1373 | } |
| 1374 | st->id = i; |
| 1375 | |
| 1376 | avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec); |
| 1377 | |
| 1378 | if (pls->is_id3_timestamped) /* custom timestamps via id3 */ |
| 1379 | avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE); |
| 1380 | else |
| 1381 | avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); |
| 1382 | } |
| 1383 | |
| 1384 | add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO); |
| 1385 | add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO); |
| 1386 | add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE); |
| 1387 | |
| 1388 | stream_offset += pls->ctx->nb_streams; |
| 1389 | } |
| 1390 | |
| 1391 | /* Create a program for each variant */ |
| 1392 | for (i = 0; i < c->n_variants; i++) { |
| 1393 | struct variant *v = c->variants[i]; |
| 1394 | AVProgram *program; |
| 1395 | |
| 1396 | program = av_new_program(s, i); |
| 1397 | if (!program) |
| 1398 | goto fail; |
| 1399 | av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0); |
| 1400 | |
| 1401 | for (j = 0; j < v->n_playlists; j++) { |
| 1402 | struct playlist *pls = v->playlists[j]; |
| 1403 | int is_shared = playlist_in_multiple_variants(c, pls); |
| 1404 | int k; |
| 1405 | |
| 1406 | for (k = 0; k < pls->ctx->nb_streams; k++) { |
| 1407 | struct AVStream *st = s->streams[pls->stream_offset + k]; |
| 1408 | |
| 1409 | ff_program_add_stream_index(s, i, pls->stream_offset + k); |
| 1410 | |
| 1411 | /* Set variant_bitrate for streams unique to this variant */ |
| 1412 | if (!is_shared && v->bandwidth) |
| 1413 | av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0); |
| 1414 | } |
| 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | return 0; |
| 1419 | fail: |
| 1420 | free_playlist_list(c); |
| 1421 | free_variant_list(c); |
| 1422 | free_rendition_list(c); |
| 1423 | return ret; |
| 1424 | } |
| 1425 | |
| 1426 | static int recheck_discard_flags(AVFormatContext *s, int first) |
| 1427 | { |
| 1428 | HLSContext *c = s->priv_data; |
| 1429 | int i, changed = 0; |
| 1430 | |
| 1431 | /* Check if any new streams are needed */ |
| 1432 | for (i = 0; i < c->n_playlists; i++) |
| 1433 | c->playlists[i]->cur_needed = 0; |
| 1434 | |
| 1435 | for (i = 0; i < s->nb_streams; i++) { |
| 1436 | AVStream *st = s->streams[i]; |
| 1437 | struct playlist *pls = c->playlists[s->streams[i]->id]; |
| 1438 | if (st->discard < AVDISCARD_ALL) |
| 1439 | pls->cur_needed = 1; |
| 1440 | } |
| 1441 | for (i = 0; i < c->n_playlists; i++) { |
| 1442 | struct playlist *pls = c->playlists[i]; |
| 1443 | if (pls->cur_needed && !pls->needed) { |
| 1444 | pls->needed = 1; |
| 1445 | changed = 1; |
| 1446 | pls->cur_seq_no = select_cur_seq_no(c, pls); |
| 1447 | pls->pb.eof_reached = 0; |
| 1448 | if (c->cur_timestamp != AV_NOPTS_VALUE) { |
| 1449 | /* catch up */ |
| 1450 | pls->seek_timestamp = c->cur_timestamp; |
| 1451 | pls->seek_flags = AVSEEK_FLAG_ANY; |
| 1452 | pls->seek_stream_index = -1; |
| 1453 | } |
| 1454 | av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no); |
| 1455 | } else if (first && !pls->cur_needed && pls->needed) { |
| 1456 | if (pls->input) |
| 1457 | ffurl_close(pls->input); |
| 1458 | pls->input = NULL; |
| 1459 | pls->needed = 0; |
| 1460 | changed = 1; |
| 1461 | av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i); |
| 1462 | } |
| 1463 | } |
| 1464 | return changed; |
| 1465 | } |
| 1466 | |
| 1467 | static void fill_timing_for_id3_timestamped_stream(struct playlist *pls) |
| 1468 | { |
| 1469 | if (pls->id3_offset >= 0) { |
| 1470 | pls->pkt.dts = pls->id3_mpegts_timestamp + |
| 1471 | av_rescale_q(pls->id3_offset, |
| 1472 | pls->ctx->streams[pls->pkt.stream_index]->time_base, |
| 1473 | MPEG_TIME_BASE_Q); |
| 1474 | if (pls->pkt.duration) |
| 1475 | pls->id3_offset += pls->pkt.duration; |
| 1476 | else |
| 1477 | pls->id3_offset = -1; |
| 1478 | } else { |
| 1479 | /* there have been packets with unknown duration |
| 1480 | * since the last id3 tag, should not normally happen */ |
| 1481 | pls->pkt.dts = AV_NOPTS_VALUE; |
| 1482 | } |
| 1483 | |
| 1484 | if (pls->pkt.duration) |
| 1485 | pls->pkt.duration = av_rescale_q(pls->pkt.duration, |
| 1486 | pls->ctx->streams[pls->pkt.stream_index]->time_base, |
| 1487 | MPEG_TIME_BASE_Q); |
| 1488 | |
| 1489 | pls->pkt.pts = AV_NOPTS_VALUE; |
| 1490 | } |
| 1491 | |
| 1492 | static AVRational get_timebase(struct playlist *pls) |
| 1493 | { |
| 1494 | if (pls->is_id3_timestamped) |
| 1495 | return MPEG_TIME_BASE_Q; |
| 1496 | |
| 1497 | return pls->ctx->streams[pls->pkt.stream_index]->time_base; |
| 1498 | } |
| 1499 | |
| 1500 | static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a, |
| 1501 | int64_t ts_b, struct playlist *pls_b) |
| 1502 | { |
| 1503 | int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q); |
| 1504 | int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q); |
| 1505 | |
| 1506 | return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33); |
| 1507 | } |
| 1508 | |
| 1509 | static int hls_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 1510 | { |
| 1511 | HLSContext *c = s->priv_data; |
| 1512 | int ret, i, minplaylist = -1; |
| 1513 | |
| 1514 | recheck_discard_flags(s, c->first_packet); |
| 1515 | |
| 1516 | for (i = 0; i < c->n_playlists; i++) { |
| 1517 | struct playlist *pls = c->playlists[i]; |
| 1518 | /* Make sure we've got one buffered packet from each open playlist |
| 1519 | * stream */ |
| 1520 | if (pls->needed && !pls->pkt.data) { |
| 1521 | while (1) { |
| 1522 | int64_t ts_diff; |
| 1523 | AVRational tb; |
| 1524 | ret = av_read_frame(pls->ctx, &pls->pkt); |
| 1525 | if (ret < 0) { |
| 1526 | if (!avio_feof(&pls->pb) && ret != AVERROR_EOF) |
| 1527 | return ret; |
| 1528 | reset_packet(&pls->pkt); |
| 1529 | break; |
| 1530 | } else { |
| 1531 | /* stream_index check prevents matching picture attachments etc. */ |
| 1532 | if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) { |
| 1533 | /* audio elementary streams are id3 timestamped */ |
| 1534 | fill_timing_for_id3_timestamped_stream(pls); |
| 1535 | } |
| 1536 | |
| 1537 | if (c->first_timestamp == AV_NOPTS_VALUE && |
| 1538 | pls->pkt.dts != AV_NOPTS_VALUE) |
| 1539 | c->first_timestamp = av_rescale_q(pls->pkt.dts, |
| 1540 | get_timebase(pls), AV_TIME_BASE_Q); |
| 1541 | } |
| 1542 | |
| 1543 | if (pls->seek_timestamp == AV_NOPTS_VALUE) |
| 1544 | break; |
| 1545 | |
| 1546 | if (pls->seek_stream_index < 0 || |
| 1547 | pls->seek_stream_index == pls->pkt.stream_index) { |
| 1548 | |
| 1549 | if (pls->pkt.dts == AV_NOPTS_VALUE) { |
| 1550 | pls->seek_timestamp = AV_NOPTS_VALUE; |
| 1551 | break; |
| 1552 | } |
| 1553 | |
| 1554 | tb = get_timebase(pls); |
| 1555 | ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE, |
| 1556 | tb.den, AV_ROUND_DOWN) - |
| 1557 | pls->seek_timestamp; |
| 1558 | if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY || |
| 1559 | pls->pkt.flags & AV_PKT_FLAG_KEY)) { |
| 1560 | pls->seek_timestamp = AV_NOPTS_VALUE; |
| 1561 | break; |
| 1562 | } |
| 1563 | } |
| 1564 | av_free_packet(&pls->pkt); |
| 1565 | reset_packet(&pls->pkt); |
| 1566 | } |
| 1567 | } |
| 1568 | /* Check if this stream has the packet with the lowest dts */ |
| 1569 | if (pls->pkt.data) { |
| 1570 | struct playlist *minpls = minplaylist < 0 ? |
| 1571 | NULL : c->playlists[minplaylist]; |
| 1572 | if (minplaylist < 0) { |
| 1573 | minplaylist = i; |
| 1574 | } else { |
| 1575 | int64_t dts = pls->pkt.dts; |
| 1576 | int64_t mindts = minpls->pkt.dts; |
| 1577 | |
| 1578 | if (dts == AV_NOPTS_VALUE || |
| 1579 | (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0)) |
| 1580 | minplaylist = i; |
| 1581 | } |
| 1582 | } |
| 1583 | } |
| 1584 | |
| 1585 | /* If we got a packet, return it */ |
| 1586 | if (minplaylist >= 0) { |
| 1587 | struct playlist *pls = c->playlists[minplaylist]; |
| 1588 | *pkt = pls->pkt; |
| 1589 | pkt->stream_index += pls->stream_offset; |
| 1590 | reset_packet(&c->playlists[minplaylist]->pkt); |
| 1591 | |
| 1592 | if (pkt->dts != AV_NOPTS_VALUE) |
| 1593 | c->cur_timestamp = av_rescale_q(pkt->dts, |
| 1594 | pls->ctx->streams[pls->pkt.stream_index]->time_base, |
| 1595 | AV_TIME_BASE_Q); |
| 1596 | |
| 1597 | return 0; |
| 1598 | } |
| 1599 | return AVERROR_EOF; |
| 1600 | } |
| 1601 | |
| 1602 | static int hls_close(AVFormatContext *s) |
| 1603 | { |
| 1604 | HLSContext *c = s->priv_data; |
| 1605 | |
| 1606 | free_playlist_list(c); |
| 1607 | free_variant_list(c); |
| 1608 | free_rendition_list(c); |
| 1609 | return 0; |
| 1610 | } |
| 1611 | |
| 1612 | static int hls_read_seek(AVFormatContext *s, int stream_index, |
| 1613 | int64_t timestamp, int flags) |
| 1614 | { |
| 1615 | HLSContext *c = s->priv_data; |
| 1616 | struct playlist *seek_pls = NULL; |
| 1617 | int i, seq_no; |
| 1618 | int64_t first_timestamp, seek_timestamp, duration; |
| 1619 | |
| 1620 | if ((flags & AVSEEK_FLAG_BYTE) || |
| 1621 | !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT)) |
| 1622 | return AVERROR(ENOSYS); |
| 1623 | |
| 1624 | first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ? |
| 1625 | 0 : c->first_timestamp; |
| 1626 | |
| 1627 | seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, |
| 1628 | s->streams[stream_index]->time_base.den, |
| 1629 | flags & AVSEEK_FLAG_BACKWARD ? |
| 1630 | AV_ROUND_DOWN : AV_ROUND_UP); |
| 1631 | |
| 1632 | duration = s->duration == AV_NOPTS_VALUE ? |
| 1633 | 0 : s->duration; |
| 1634 | |
| 1635 | if (0 < duration && duration < seek_timestamp - first_timestamp) |
| 1636 | return AVERROR(EIO); |
| 1637 | |
| 1638 | /* find the playlist with the specified stream */ |
| 1639 | for (i = 0; i < c->n_playlists; i++) { |
| 1640 | struct playlist *pls = c->playlists[i]; |
| 1641 | if (stream_index >= pls->stream_offset && |
| 1642 | stream_index - pls->stream_offset < pls->ctx->nb_streams) { |
| 1643 | seek_pls = pls; |
| 1644 | break; |
| 1645 | } |
| 1646 | } |
| 1647 | /* check if the timestamp is valid for the playlist with the |
| 1648 | * specified stream index */ |
| 1649 | if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no)) |
| 1650 | return AVERROR(EIO); |
| 1651 | |
| 1652 | /* set segment now so we do not need to search again below */ |
| 1653 | seek_pls->cur_seq_no = seq_no; |
| 1654 | seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset; |
| 1655 | |
| 1656 | for (i = 0; i < c->n_playlists; i++) { |
| 1657 | /* Reset reading */ |
| 1658 | struct playlist *pls = c->playlists[i]; |
| 1659 | if (pls->input) { |
| 1660 | ffurl_close(pls->input); |
| 1661 | pls->input = NULL; |
| 1662 | } |
| 1663 | av_free_packet(&pls->pkt); |
| 1664 | reset_packet(&pls->pkt); |
| 1665 | pls->pb.eof_reached = 0; |
| 1666 | /* Clear any buffered data */ |
| 1667 | pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer; |
| 1668 | /* Reset the pos, to let the mpegts demuxer know we've seeked. */ |
| 1669 | pls->pb.pos = 0; |
| 1670 | /* Flush the packet queue of the subdemuxer. */ |
| 1671 | ff_read_frame_flush(pls->ctx); |
| 1672 | |
| 1673 | pls->seek_timestamp = seek_timestamp; |
| 1674 | pls->seek_flags = flags; |
| 1675 | |
| 1676 | if (pls != seek_pls) { |
| 1677 | /* set closest segment seq_no for playlists not handled above */ |
| 1678 | find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no); |
| 1679 | /* seek the playlist to the given position without taking |
| 1680 | * keyframes into account since this playlist does not have the |
| 1681 | * specified stream where we should look for the keyframes */ |
| 1682 | pls->seek_stream_index = -1; |
| 1683 | pls->seek_flags |= AVSEEK_FLAG_ANY; |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | c->cur_timestamp = seek_timestamp; |
| 1688 | |
| 1689 | return 0; |
| 1690 | } |
| 1691 | |
| 1692 | static int hls_probe(AVProbeData *p) |
| 1693 | { |
| 1694 | /* Require #EXTM3U at the start, and either one of the ones below |
| 1695 | * somewhere for a proper match. */ |
| 1696 | if (strncmp(p->buf, "#EXTM3U", 7)) |
| 1697 | return 0; |
| 1698 | if (strstr(p->buf, "#EXT-X-STREAM-INF:") || |
| 1699 | strstr(p->buf, "#EXT-X-TARGETDURATION:") || |
| 1700 | strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:")) |
| 1701 | return AVPROBE_SCORE_MAX; |
| 1702 | return 0; |
| 1703 | } |
| 1704 | |
| 1705 | AVInputFormat ff_hls_demuxer = { |
| 1706 | .name = "hls,applehttp", |
| 1707 | .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), |
| 1708 | .priv_data_size = sizeof(HLSContext), |
| 1709 | .read_probe = hls_probe, |
| 1710 | .read_header = hls_read_header, |
| 1711 | .read_packet = hls_read_packet, |
| 1712 | .read_close = hls_close, |
| 1713 | .read_seek = hls_read_seek, |
| 1714 | }; |