2 * Apple HTTP Live Streaming demuxer
3 * Copyright (c) 2010 Martin Storsjo
4 * Copyright (c) 2013 Anssi Hannula
6 * This file is part of FFmpeg.
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.
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.
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
25 * Apple HTTP Live Streaming demuxer
26 * http://tools.ietf.org/html/draft-pantos-http-live-streaming
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"
38 #include "avio_internal.h"
42 #define INITIAL_BUFFER_SIZE 32768
44 #define MAX_FIELD_LEN 64
45 #define MAX_CHARACTERISTICS_LEN 512
47 #define MPEG_TIME_BASE 90000
48 #define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
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
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.
74 enum KeyType key_type;
87 * Each playlist has its own demuxer. If it currently is active,
88 * it has an open AVIOContext too, and potentially an AVPacket
89 * containing the next packet from this stream.
92 char url[MAX_URL_SIZE];
96 AVFormatContext *parent;
103 enum PlaylistType type;
104 int64_t target_duration;
107 struct segment **segments;
108 int needed, cur_needed;
110 int64_t cur_seg_offset;
111 int64_t last_load_time;
113 char key_url[MAX_URL_SIZE];
116 /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
117 * (and possibly other ID3 tags) in the beginning of each segment) */
118 int is_id3_timestamped; /* -1: not yet known */
119 int64_t id3_mpegts_timestamp; /* in mpegts tb */
120 int64_t id3_offset; /* in stream original tb */
121 uint8_t* id3_buf; /* temp buffer for id3 parsing */
122 unsigned int id3_buf_size;
123 AVDictionary *id3_initial; /* data from first id3 tag */
124 int id3_found; /* ID3 tag found at some point */
125 int id3_changed; /* ID3 tag data has changed at some point */
126 ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
128 int64_t seek_timestamp;
130 int seek_stream_index; /* into subdemuxer stream array */
132 /* Renditions associated with this playlist, if any.
133 * Alternative rendition playlists have a single rendition associated
134 * with them, and variant main Media Playlists may have
135 * multiple (playlist-less) renditions associated with them. */
137 struct rendition **renditions;
141 * Renditions are e.g. alternative subtitle or audio streams.
142 * The rendition may either be an external playlist or it may be
143 * contained in the main Media Playlist of the variant (in which case
147 enum AVMediaType type;
148 struct playlist *playlist;
149 char group_id[MAX_FIELD_LEN];
150 char language[MAX_FIELD_LEN];
151 char name[MAX_FIELD_LEN];
158 /* every variant contains at least the main Media Playlist in index 0 */
160 struct playlist **playlists;
162 char audio_group[MAX_FIELD_LEN];
163 char video_group[MAX_FIELD_LEN];
164 char subtitles_group[MAX_FIELD_LEN];
167 typedef struct HLSContext {
170 struct variant **variants;
172 struct playlist **playlists;
174 struct rendition **renditions;
177 int live_start_index;
179 int64_t first_timestamp;
180 int64_t cur_timestamp;
181 AVIOInterruptCB *interrupt_callback;
182 char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
183 char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
184 char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context
187 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
189 int len = ff_get_line(s, buf, maxlen);
190 while (len > 0 && av_isspace(buf[len - 1]))
195 static void free_segment_list(struct playlist *pls)
198 for (i = 0; i < pls->n_segments; i++) {
199 av_freep(&pls->segments[i]->key);
200 av_freep(&pls->segments[i]->url);
201 av_freep(&pls->segments[i]);
203 av_freep(&pls->segments);
207 static void free_playlist_list(HLSContext *c)
210 for (i = 0; i < c->n_playlists; i++) {
211 struct playlist *pls = c->playlists[i];
212 free_segment_list(pls);
213 av_freep(&pls->renditions);
214 av_freep(&pls->id3_buf);
215 av_dict_free(&pls->id3_initial);
216 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
217 av_free_packet(&pls->pkt);
218 av_freep(&pls->pb.buffer);
220 ffurl_close(pls->input);
223 avformat_close_input(&pls->ctx);
227 av_freep(&c->playlists);
228 av_freep(&c->cookies);
229 av_freep(&c->user_agent);
233 static void free_variant_list(HLSContext *c)
236 for (i = 0; i < c->n_variants; i++) {
237 struct variant *var = c->variants[i];
238 av_freep(&var->playlists);
241 av_freep(&c->variants);
245 static void free_rendition_list(HLSContext *c)
248 for (i = 0; i < c->n_renditions; i++)
249 av_freep(&c->renditions[i]);
250 av_freep(&c->renditions);
255 * Used to reset a statically allocated AVPacket to a clean slate,
256 * containing no data.
258 static void reset_packet(AVPacket *pkt)
264 static struct playlist *new_playlist(HLSContext *c, const char *url,
267 struct playlist *pls = av_mallocz(sizeof(struct playlist));
270 reset_packet(&pls->pkt);
271 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
272 pls->seek_timestamp = AV_NOPTS_VALUE;
274 pls->is_id3_timestamped = -1;
275 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
277 dynarray_add(&c->playlists, &c->n_playlists, pls);
281 struct variant_info {
283 /* variant group ids: */
284 char audio[MAX_FIELD_LEN];
285 char video[MAX_FIELD_LEN];
286 char subtitles[MAX_FIELD_LEN];
289 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
290 const char *url, const char *base)
293 struct playlist *pls;
295 pls = new_playlist(c, url, base);
299 var = av_mallocz(sizeof(struct variant));
304 var->bandwidth = atoi(info->bandwidth);
305 strcpy(var->audio_group, info->audio);
306 strcpy(var->video_group, info->video);
307 strcpy(var->subtitles_group, info->subtitles);
310 dynarray_add(&c->variants, &c->n_variants, var);
311 dynarray_add(&var->playlists, &var->n_playlists, pls);
315 static void handle_variant_args(struct variant_info *info, const char *key,
316 int key_len, char **dest, int *dest_len)
318 if (!strncmp(key, "BANDWIDTH=", key_len)) {
319 *dest = info->bandwidth;
320 *dest_len = sizeof(info->bandwidth);
321 } else if (!strncmp(key, "AUDIO=", key_len)) {
323 *dest_len = sizeof(info->audio);
324 } else if (!strncmp(key, "VIDEO=", key_len)) {
326 *dest_len = sizeof(info->video);
327 } else if (!strncmp(key, "SUBTITLES=", key_len)) {
328 *dest = info->subtitles;
329 *dest_len = sizeof(info->subtitles);
334 char uri[MAX_URL_SIZE];
339 static void handle_key_args(struct key_info *info, const char *key,
340 int key_len, char **dest, int *dest_len)
342 if (!strncmp(key, "METHOD=", key_len)) {
343 *dest = info->method;
344 *dest_len = sizeof(info->method);
345 } else if (!strncmp(key, "URI=", key_len)) {
347 *dest_len = sizeof(info->uri);
348 } else if (!strncmp(key, "IV=", key_len)) {
350 *dest_len = sizeof(info->iv);
354 struct rendition_info {
356 char uri[MAX_URL_SIZE];
357 char group_id[MAX_FIELD_LEN];
358 char language[MAX_FIELD_LEN];
359 char assoc_language[MAX_FIELD_LEN];
360 char name[MAX_FIELD_LEN];
363 char characteristics[MAX_CHARACTERISTICS_LEN];
366 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
367 const char *url_base)
369 struct rendition *rend;
370 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
371 char *characteristic;
375 if (!strcmp(info->type, "AUDIO"))
376 type = AVMEDIA_TYPE_AUDIO;
377 else if (!strcmp(info->type, "VIDEO"))
378 type = AVMEDIA_TYPE_VIDEO;
379 else if (!strcmp(info->type, "SUBTITLES"))
380 type = AVMEDIA_TYPE_SUBTITLE;
381 else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
382 /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
383 * AVC SEI RBSP anyway */
386 if (type == AVMEDIA_TYPE_UNKNOWN)
389 /* URI is mandatory for subtitles as per spec */
390 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
393 /* TODO: handle subtitles (each segment has to parsed separately) */
394 if (type == AVMEDIA_TYPE_SUBTITLE)
397 rend = av_mallocz(sizeof(struct rendition));
401 dynarray_add(&c->renditions, &c->n_renditions, rend);
404 strcpy(rend->group_id, info->group_id);
405 strcpy(rend->language, info->language);
406 strcpy(rend->name, info->name);
408 /* add the playlist if this is an external rendition */
410 rend->playlist = new_playlist(c, info->uri, url_base);
412 dynarray_add(&rend->playlist->renditions,
413 &rend->playlist->n_renditions, rend);
416 if (info->assoc_language[0]) {
417 int langlen = strlen(rend->language);
418 if (langlen < sizeof(rend->language) - 3) {
419 rend->language[langlen] = ',';
420 strncpy(rend->language + langlen + 1, info->assoc_language,
421 sizeof(rend->language) - langlen - 2);
425 if (!strcmp(info->defaultr, "YES"))
426 rend->disposition |= AV_DISPOSITION_DEFAULT;
427 if (!strcmp(info->forced, "YES"))
428 rend->disposition |= AV_DISPOSITION_FORCED;
430 chr_ptr = info->characteristics;
431 while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
432 if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
433 rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
434 else if (!strcmp(characteristic, "public.accessibility.describes-video"))
435 rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
443 static void handle_rendition_args(struct rendition_info *info, const char *key,
444 int key_len, char **dest, int *dest_len)
446 if (!strncmp(key, "TYPE=", key_len)) {
448 *dest_len = sizeof(info->type);
449 } else if (!strncmp(key, "URI=", key_len)) {
451 *dest_len = sizeof(info->uri);
452 } else if (!strncmp(key, "GROUP-ID=", key_len)) {
453 *dest = info->group_id;
454 *dest_len = sizeof(info->group_id);
455 } else if (!strncmp(key, "LANGUAGE=", key_len)) {
456 *dest = info->language;
457 *dest_len = sizeof(info->language);
458 } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
459 *dest = info->assoc_language;
460 *dest_len = sizeof(info->assoc_language);
461 } else if (!strncmp(key, "NAME=", key_len)) {
463 *dest_len = sizeof(info->name);
464 } else if (!strncmp(key, "DEFAULT=", key_len)) {
465 *dest = info->defaultr;
466 *dest_len = sizeof(info->defaultr);
467 } else if (!strncmp(key, "FORCED=", key_len)) {
468 *dest = info->forced;
469 *dest_len = sizeof(info->forced);
470 } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
471 *dest = info->characteristics;
472 *dest_len = sizeof(info->characteristics);
476 * - AUTOSELECT: client may autoselect based on e.g. system language
477 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
481 /* used by parse_playlist to allocate a new variant+playlist when the
482 * playlist is detected to be a Media Playlist (not Master Playlist)
483 * and we have no parent Master Playlist (parsing of which would have
484 * allocated the variant and playlist already) */
485 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
489 if (!new_variant(c, NULL, url, NULL))
490 return AVERROR(ENOMEM);
491 *pls = c->playlists[c->n_playlists - 1];
495 /* pls = NULL => Master Playlist or parentless Media Playlist
496 * pls = !NULL => parented Media Playlist, playlist+variant allocated */
497 static int parse_playlist(HLSContext *c, const char *url,
498 struct playlist *pls, AVIOContext *in)
500 int ret = 0, is_segment = 0, is_variant = 0;
501 int64_t duration = 0;
502 enum KeyType key_type = KEY_NONE;
505 char key[MAX_URL_SIZE] = "";
506 char line[MAX_URL_SIZE];
509 int64_t seg_offset = 0;
510 int64_t seg_size = -1;
511 uint8_t *new_url = NULL;
512 struct variant_info variant_info;
513 char tmp_str[MAX_URL_SIZE];
516 AVDictionary *opts = NULL;
518 /* Some HLS servers don't like being sent the range header */
519 av_dict_set(&opts, "seekable", "0", 0);
521 // broker prior HTTP options that should be consistent across requests
522 av_dict_set(&opts, "user-agent", c->user_agent, 0);
523 av_dict_set(&opts, "cookies", c->cookies, 0);
524 av_dict_set(&opts, "headers", c->headers, 0);
526 ret = avio_open2(&in, url, AVIO_FLAG_READ,
527 c->interrupt_callback, &opts);
533 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
536 read_chomp_line(in, line, sizeof(line));
537 if (strcmp(line, "#EXTM3U")) {
538 ret = AVERROR_INVALIDDATA;
543 free_segment_list(pls);
545 pls->type = PLS_TYPE_UNSPECIFIED;
547 while (!avio_feof(in)) {
548 read_chomp_line(in, line, sizeof(line));
549 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
551 memset(&variant_info, 0, sizeof(variant_info));
552 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
554 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
555 struct key_info info = {{0}};
556 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
560 if (!strcmp(info.method, "AES-128"))
561 key_type = KEY_AES_128;
562 if (!strcmp(info.method, "SAMPLE-AES"))
563 key_type = KEY_SAMPLE_AES;
564 if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
565 ff_hex_to_data(iv, info.iv + 2);
568 av_strlcpy(key, info.uri, sizeof(key));
569 } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
570 struct rendition_info info = {{0}};
571 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
573 new_rendition(c, &info, url);
574 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
575 ret = ensure_playlist(c, &pls, url);
578 pls->target_duration = atoi(ptr) * AV_TIME_BASE;
579 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
580 ret = ensure_playlist(c, &pls, url);
583 pls->start_seq_no = atoi(ptr);
584 } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
585 ret = ensure_playlist(c, &pls, url);
588 if (!strcmp(ptr, "EVENT"))
589 pls->type = PLS_TYPE_EVENT;
590 else if (!strcmp(ptr, "VOD"))
591 pls->type = PLS_TYPE_VOD;
592 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
595 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
597 duration = atof(ptr) * AV_TIME_BASE;
598 } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
599 seg_size = atoi(ptr);
600 ptr = strchr(ptr, '@');
602 seg_offset = atoi(ptr+1);
603 } else if (av_strstart(line, "#", NULL)) {
605 } else if (line[0]) {
607 if (!new_variant(c, &variant_info, line, url)) {
608 ret = AVERROR(ENOMEM);
616 if (!new_variant(c, 0, url, NULL)) {
617 ret = AVERROR(ENOMEM);
620 pls = c->playlists[c->n_playlists - 1];
622 seg = av_malloc(sizeof(struct segment));
624 ret = AVERROR(ENOMEM);
627 seg->duration = duration;
628 seg->key_type = key_type;
630 memcpy(seg->iv, iv, sizeof(iv));
632 int seq = pls->start_seq_no + pls->n_segments;
633 memset(seg->iv, 0, sizeof(seg->iv));
634 AV_WB32(seg->iv + 12, seq);
637 if (key_type != KEY_NONE) {
638 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
639 seg->key = av_strdup(tmp_str);
642 ret = AVERROR(ENOMEM);
649 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
650 seg->url = av_strdup(tmp_str);
654 ret = AVERROR(ENOMEM);
658 dynarray_add(&pls->segments, &pls->n_segments, seg);
661 seg->size = seg_size;
663 seg->url_offset = seg_offset;
664 seg_offset += seg_size;
674 pls->last_load_time = av_gettime_relative();
683 enum ReadFromURLMode {
688 /* read from URLContext, limiting read to current segment */
689 static int read_from_url(struct playlist *pls, uint8_t *buf, int buf_size,
690 enum ReadFromURLMode mode)
693 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
695 /* limit read if the segment was only a part of a file */
697 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
699 if (mode == READ_COMPLETE)
700 ret = ffurl_read_complete(pls->input, buf, buf_size);
702 ret = ffurl_read(pls->input, buf, buf_size);
705 pls->cur_seg_offset += ret;
710 /* Parse the raw ID3 data and pass contents to caller */
711 static void parse_id3(AVFormatContext *s, AVIOContext *pb,
712 AVDictionary **metadata, int64_t *dts,
713 ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
715 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
716 ID3v2ExtraMeta *meta;
718 ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
719 for (meta = *extra_meta; meta; meta = meta->next) {
720 if (!strcmp(meta->tag, "PRIV")) {
721 ID3v2ExtraMetaPRIV *priv = meta->data;
722 if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
723 /* 33-bit MPEG timestamp */
724 int64_t ts = AV_RB64(priv->data);
725 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
726 if ((ts & ~((1ULL << 33) - 1)) == 0)
729 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
731 } else if (!strcmp(meta->tag, "APIC") && apic)
736 /* Check if the ID3 metadata contents have changed */
737 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
738 ID3v2ExtraMetaAPIC *apic)
740 AVDictionaryEntry *entry = NULL;
741 AVDictionaryEntry *oldentry;
742 /* check that no keys have changed values */
743 while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
744 oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
745 if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
749 /* check if apic appeared */
750 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
754 int size = pls->ctx->streams[1]->attached_pic.size;
755 if (size != apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE)
758 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
765 /* Parse ID3 data and handle the found data */
766 static void handle_id3(AVIOContext *pb, struct playlist *pls)
768 AVDictionary *metadata = NULL;
769 ID3v2ExtraMetaAPIC *apic = NULL;
770 ID3v2ExtraMeta *extra_meta = NULL;
771 int64_t timestamp = AV_NOPTS_VALUE;
773 parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta);
775 if (timestamp != AV_NOPTS_VALUE) {
776 pls->id3_mpegts_timestamp = timestamp;
780 if (!pls->id3_found) {
781 /* initial ID3 tags */
782 av_assert0(!pls->id3_deferred_extra);
785 /* get picture attachment and set text metadata */
786 if (pls->ctx->nb_streams)
787 ff_id3v2_parse_apic(pls->ctx, &extra_meta);
789 /* demuxer not yet opened, defer picture attachment */
790 pls->id3_deferred_extra = extra_meta;
792 av_dict_copy(&pls->ctx->metadata, metadata, 0);
793 pls->id3_initial = metadata;
796 if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
797 avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
798 pls->id3_changed = 1;
800 av_dict_free(&metadata);
803 if (!pls->id3_deferred_extra)
804 ff_id3v2_free_extra_meta(&extra_meta);
807 /* Intercept and handle ID3 tags between URLContext and AVIOContext */
808 static void intercept_id3(struct playlist *pls, uint8_t *buf,
809 int buf_size, int *len)
811 /* intercept id3 tags, we do not want to pass them to the raw
812 * demuxer on all segment switches */
817 /* gather all the id3 tags */
819 /* see if we can retrieve enough data for ID3 header */
820 if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
821 bytes = read_from_url(pls, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE);
824 if (bytes == ID3v2_HEADER_SIZE - *len)
825 /* no EOF yet, so fill the caller buffer again after
826 * we have stripped the ID3 tags */
831 } else if (*len <= 0) {
838 if (*len < ID3v2_HEADER_SIZE)
841 if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
842 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
843 int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
844 int taglen = ff_id3v2_tag_len(buf);
845 int tag_got_bytes = FFMIN(taglen, *len);
846 int remaining = taglen - tag_got_bytes;
848 if (taglen > maxsize) {
849 av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
855 * Copy the id3 tag to our temporary id3 buffer.
856 * We could read a small id3 tag directly without memcpy, but
857 * we would still need to copy the large tags, and handling
858 * both of those cases together with the possibility for multiple
859 * tags would make the handling a bit complex.
861 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
864 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
865 id3_buf_pos += tag_got_bytes;
867 /* strip the intercepted bytes */
868 *len -= tag_got_bytes;
869 memmove(buf, buf + tag_got_bytes, *len);
870 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
873 /* read the rest of the tag in */
874 if (read_from_url(pls, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
876 id3_buf_pos += remaining;
877 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
881 /* no more ID3 tags */
886 /* re-fill buffer for the caller unless EOF */
887 if (*len >= 0 && (fill_buf || *len == 0)) {
888 bytes = read_from_url(pls, buf + *len, buf_size - *len, READ_NORMAL);
890 /* ignore error if we already had some data */
898 /* Now parse all the ID3 tags */
899 AVIOContext id3ioctx;
900 ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
901 handle_id3(&id3ioctx, pls);
904 if (pls->is_id3_timestamped == -1)
905 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
908 static void update_options(char **dest, const char *name, void *src)
911 av_opt_get(src, name, 0, (uint8_t**)dest);
912 if (*dest && !strlen(*dest))
916 static int open_input(HLSContext *c, struct playlist *pls)
918 AVDictionary *opts = NULL;
919 AVDictionary *opts2 = NULL;
921 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
923 // broker prior HTTP options that should be consistent across requests
924 av_dict_set(&opts, "user-agent", c->user_agent, 0);
925 av_dict_set(&opts, "cookies", c->cookies, 0);
926 av_dict_set(&opts, "headers", c->headers, 0);
927 av_dict_set(&opts, "seekable", "0", 0);
929 // Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice)
930 av_dict_copy(&opts2, opts, 0);
932 if (seg->size >= 0) {
933 /* try to restrict the HTTP request to the part we want
934 * (if this is in fact a HTTP request) */
935 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
936 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
939 av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
940 seg->url, seg->url_offset, pls->index);
942 if (seg->key_type == KEY_NONE) {
943 ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ,
944 &pls->parent->interrupt_callback, &opts);
946 } else if (seg->key_type == KEY_AES_128) {
947 char iv[33], key[33], url[MAX_URL_SIZE];
948 if (strcmp(seg->key, pls->key_url)) {
950 if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
951 &pls->parent->interrupt_callback, &opts2) == 0) {
952 if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
953 != sizeof(pls->key)) {
954 av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
957 update_options(&c->cookies, "cookies", uc->priv_data);
958 av_dict_set(&opts, "cookies", c->cookies, 0);
961 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
964 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
966 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
967 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
968 iv[32] = key[32] = '\0';
969 if (strstr(seg->url, "://"))
970 snprintf(url, sizeof(url), "crypto+%s", seg->url);
972 snprintf(url, sizeof(url), "crypto:%s", seg->url);
973 if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ,
974 &pls->parent->interrupt_callback)) < 0)
976 av_opt_set(pls->input->priv_data, "key", key, 0);
977 av_opt_set(pls->input->priv_data, "iv", iv, 0);
979 if ((ret = ffurl_connect(pls->input, &opts)) < 0) {
980 ffurl_close(pls->input);
985 } else if (seg->key_type == KEY_SAMPLE_AES) {
986 av_log(pls->parent, AV_LOG_ERROR,
987 "SAMPLE-AES encryption is not supported yet\n");
988 ret = AVERROR_PATCHWELCOME;
991 ret = AVERROR(ENOSYS);
993 /* Seek to the requested position. If this was a HTTP request, the offset
994 * should already be where want it to, but this allows e.g. local testing
995 * without a HTTP server. */
996 if (ret == 0 && seg->key_type == KEY_NONE) {
997 int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET);
999 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
1001 ffurl_close(pls->input);
1007 av_dict_free(&opts);
1008 av_dict_free(&opts2);
1009 pls->cur_seg_offset = 0;
1013 static int64_t default_reload_interval(struct playlist *pls)
1015 return pls->n_segments > 0 ?
1016 pls->segments[pls->n_segments - 1]->duration :
1017 pls->target_duration;
1020 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1022 struct playlist *v = opaque;
1023 HLSContext *c = v->parent->priv_data;
1025 int just_opened = 0;
1032 int64_t reload_interval;
1034 /* Check that the playlist is still needed before opening a new
1036 if (v->ctx && v->ctx->nb_streams &&
1037 v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
1039 for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
1041 if (v->parent->streams[i]->discard < AVDISCARD_ALL)
1046 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
1051 /* If this is a live stream and the reload interval has elapsed since
1052 * the last playlist reload, reload the playlists now. */
1053 reload_interval = default_reload_interval(v);
1057 av_gettime_relative() - v->last_load_time >= reload_interval) {
1058 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1059 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1063 /* If we need to reload the playlist again below (if
1064 * there's still no more segments), switch to a reload
1065 * interval of half the target duration. */
1066 reload_interval = v->target_duration / 2;
1068 if (v->cur_seq_no < v->start_seq_no) {
1069 av_log(NULL, AV_LOG_WARNING,
1070 "skipping %d segments ahead, expired from playlists\n",
1071 v->start_seq_no - v->cur_seq_no);
1072 v->cur_seq_no = v->start_seq_no;
1074 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1077 while (av_gettime_relative() - v->last_load_time < reload_interval) {
1078 if (ff_check_interrupt(c->interrupt_callback))
1079 return AVERROR_EXIT;
1080 av_usleep(100*1000);
1082 /* Enough time has elapsed since the last reload */
1086 ret = open_input(c, v);
1088 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
1096 ret = read_from_url(v, buf, buf_size, READ_NORMAL);
1098 if (just_opened && v->is_id3_timestamped != 0) {
1099 /* Intercept ID3 tags here, elementary audio streams are required
1100 * to convey timestamps using them in the beginning of each segment. */
1101 intercept_id3(v, buf, buf_size, &ret);
1106 ffurl_close(v->input);
1110 c->cur_seq_no = v->cur_seq_no;
1115 static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls)
1117 int variant_count = 0;
1120 for (i = 0; i < c->n_variants && variant_count < 2; i++) {
1121 struct variant *v = c->variants[i];
1123 for (j = 0; j < v->n_playlists; j++) {
1124 if (v->playlists[j] == pls) {
1131 return variant_count >= 2;
1134 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1135 enum AVMediaType type, const char *group_id)
1139 for (i = 0; i < c->n_renditions; i++) {
1140 struct rendition *rend = c->renditions[i];
1142 if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1145 /* rendition is an external playlist
1146 * => add the playlist to the variant */
1147 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1149 /* rendition is part of the variant main Media Playlist
1150 * => add the rendition to the main Media Playlist */
1151 dynarray_add(&var->playlists[0]->renditions,
1152 &var->playlists[0]->n_renditions,
1158 static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1159 enum AVMediaType type)
1164 for (i = 0; i < pls->ctx->nb_streams; i++) {
1165 AVStream *st = s->streams[pls->stream_offset + i];
1167 if (st->codec->codec_type != type)
1170 for (; rend_idx < pls->n_renditions; rend_idx++) {
1171 struct rendition *rend = pls->renditions[rend_idx];
1173 if (rend->type != type)
1176 if (rend->language[0])
1177 av_dict_set(&st->metadata, "language", rend->language, 0);
1179 av_dict_set(&st->metadata, "comment", rend->name, 0);
1181 st->disposition |= rend->disposition;
1183 if (rend_idx >=pls->n_renditions)
1188 /* if timestamp was in valid range: returns 1 and sets seq_no
1189 * if not: returns 0 and sets seq_no to closest segment */
1190 static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
1191 int64_t timestamp, int *seq_no)
1194 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1195 0 : c->first_timestamp;
1197 if (timestamp < pos) {
1198 *seq_no = pls->start_seq_no;
1202 for (i = 0; i < pls->n_segments; i++) {
1203 int64_t diff = pos + pls->segments[i]->duration - timestamp;
1205 *seq_no = pls->start_seq_no + i;
1208 pos += pls->segments[i]->duration;
1211 *seq_no = pls->start_seq_no + pls->n_segments - 1;
1216 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1220 if (!pls->finished && !c->first_packet &&
1221 av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
1222 /* reload the playlist since it was suspended */
1223 parse_playlist(c, pls->url, pls, NULL);
1225 /* If playback is already in progress (we are just selecting a new
1226 * playlist) and this is a complete file, find the matching segment
1227 * by counting durations. */
1228 if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1229 find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1233 if (!pls->finished) {
1234 if (!c->first_packet && /* we are doing a segment selection during playback */
1235 c->cur_seq_no >= pls->start_seq_no &&
1236 c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1237 /* While spec 3.4.3 says that we cannot assume anything about the
1238 * content at the same sequence number on different playlists,
1239 * in practice this seems to work and doing it otherwise would
1240 * require us to download a segment to inspect its timestamps. */
1241 return c->cur_seq_no;
1243 /* If this is a live stream, start live_start_index segments from the
1245 if (c->live_start_index < 0)
1246 return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
1248 return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
1251 /* Otherwise just start on the first segment. */
1252 return pls->start_seq_no;
1255 static int hls_read_header(AVFormatContext *s)
1257 URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
1258 HLSContext *c = s->priv_data;
1259 int ret = 0, i, j, stream_offset = 0;
1261 c->interrupt_callback = &s->interrupt_callback;
1263 c->first_packet = 1;
1264 c->first_timestamp = AV_NOPTS_VALUE;
1265 c->cur_timestamp = AV_NOPTS_VALUE;
1267 // if the URL context is good, read important options we must broker later
1268 if (u && u->prot->priv_data_class) {
1269 // get the previous user agent & set back to null if string size is zero
1270 update_options(&c->user_agent, "user-agent", u->priv_data);
1272 // get the previous cookies & set back to null if string size is zero
1273 update_options(&c->cookies, "cookies", u->priv_data);
1275 // get the previous headers & set back to null if string size is zero
1276 update_options(&c->headers, "headers", u->priv_data);
1279 if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
1282 if (c->n_variants == 0) {
1283 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1287 /* If the playlist only contained playlists (Master Playlist),
1288 * parse each individual playlist. */
1289 if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1290 for (i = 0; i < c->n_playlists; i++) {
1291 struct playlist *pls = c->playlists[i];
1292 if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
1297 if (c->variants[0]->playlists[0]->n_segments == 0) {
1298 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1303 /* If this isn't a live stream, calculate the total duration of the
1305 if (c->variants[0]->playlists[0]->finished) {
1306 int64_t duration = 0;
1307 for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1308 duration += c->variants[0]->playlists[0]->segments[i]->duration;
1309 s->duration = duration;
1312 /* Associate renditions with variants */
1313 for (i = 0; i < c->n_variants; i++) {
1314 struct variant *var = c->variants[i];
1316 if (var->audio_group[0])
1317 add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
1318 if (var->video_group[0])
1319 add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
1320 if (var->subtitles_group[0])
1321 add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
1324 /* Open the demuxer for each playlist */
1325 for (i = 0; i < c->n_playlists; i++) {
1326 struct playlist *pls = c->playlists[i];
1327 AVInputFormat *in_fmt = NULL;
1329 if (!(pls->ctx = avformat_alloc_context())) {
1330 ret = AVERROR(ENOMEM);
1334 if (pls->n_segments == 0)
1340 pls->cur_seq_no = select_cur_seq_no(c, pls);
1342 pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1343 if (!pls->read_buffer){
1344 ret = AVERROR(ENOMEM);
1345 avformat_free_context(pls->ctx);
1349 ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1350 read_data, NULL, NULL);
1351 pls->pb.seekable = 0;
1352 ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1355 /* Free the ctx - it isn't initialized properly at this point,
1356 * so avformat_close_input shouldn't be called. If
1357 * avformat_open_input fails below, it frees and zeros the
1358 * context, so it doesn't need any special treatment like this. */
1359 av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1360 avformat_free_context(pls->ctx);
1364 pls->ctx->pb = &pls->pb;
1365 pls->stream_offset = stream_offset;
1367 if ((ret = ff_copy_whitelists(pls->ctx, s)) < 0)
1370 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1374 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1375 ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
1376 avformat_queue_attached_pictures(pls->ctx);
1377 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
1378 pls->id3_deferred_extra = NULL;
1381 pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
1382 ret = avformat_find_stream_info(pls->ctx, NULL);
1386 if (pls->is_id3_timestamped == -1)
1387 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1389 /* Create new AVStreams for each stream in this playlist */
1390 for (j = 0; j < pls->ctx->nb_streams; j++) {
1391 AVStream *st = avformat_new_stream(s, NULL);
1392 AVStream *ist = pls->ctx->streams[j];
1394 ret = AVERROR(ENOMEM);
1399 avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
1401 if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1402 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1404 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1407 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
1408 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
1409 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
1411 stream_offset += pls->ctx->nb_streams;
1414 /* Create a program for each variant */
1415 for (i = 0; i < c->n_variants; i++) {
1416 struct variant *v = c->variants[i];
1419 program = av_new_program(s, i);
1422 av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1424 for (j = 0; j < v->n_playlists; j++) {
1425 struct playlist *pls = v->playlists[j];
1426 int is_shared = playlist_in_multiple_variants(c, pls);
1429 for (k = 0; k < pls->ctx->nb_streams; k++) {
1430 struct AVStream *st = s->streams[pls->stream_offset + k];
1432 ff_program_add_stream_index(s, i, pls->stream_offset + k);
1434 /* Set variant_bitrate for streams unique to this variant */
1435 if (!is_shared && v->bandwidth)
1436 av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0);
1443 free_playlist_list(c);
1444 free_variant_list(c);
1445 free_rendition_list(c);
1449 static int recheck_discard_flags(AVFormatContext *s, int first)
1451 HLSContext *c = s->priv_data;
1454 /* Check if any new streams are needed */
1455 for (i = 0; i < c->n_playlists; i++)
1456 c->playlists[i]->cur_needed = 0;
1458 for (i = 0; i < s->nb_streams; i++) {
1459 AVStream *st = s->streams[i];
1460 struct playlist *pls = c->playlists[s->streams[i]->id];
1461 if (st->discard < AVDISCARD_ALL)
1462 pls->cur_needed = 1;
1464 for (i = 0; i < c->n_playlists; i++) {
1465 struct playlist *pls = c->playlists[i];
1466 if (pls->cur_needed && !pls->needed) {
1469 pls->cur_seq_no = select_cur_seq_no(c, pls);
1470 pls->pb.eof_reached = 0;
1471 if (c->cur_timestamp != AV_NOPTS_VALUE) {
1473 pls->seek_timestamp = c->cur_timestamp;
1474 pls->seek_flags = AVSEEK_FLAG_ANY;
1475 pls->seek_stream_index = -1;
1477 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
1478 } else if (first && !pls->cur_needed && pls->needed) {
1480 ffurl_close(pls->input);
1484 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
1490 static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
1492 if (pls->id3_offset >= 0) {
1493 pls->pkt.dts = pls->id3_mpegts_timestamp +
1494 av_rescale_q(pls->id3_offset,
1495 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1497 if (pls->pkt.duration)
1498 pls->id3_offset += pls->pkt.duration;
1500 pls->id3_offset = -1;
1502 /* there have been packets with unknown duration
1503 * since the last id3 tag, should not normally happen */
1504 pls->pkt.dts = AV_NOPTS_VALUE;
1507 if (pls->pkt.duration)
1508 pls->pkt.duration = av_rescale_q(pls->pkt.duration,
1509 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1512 pls->pkt.pts = AV_NOPTS_VALUE;
1515 static AVRational get_timebase(struct playlist *pls)
1517 if (pls->is_id3_timestamped)
1518 return MPEG_TIME_BASE_Q;
1520 return pls->ctx->streams[pls->pkt.stream_index]->time_base;
1523 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
1524 int64_t ts_b, struct playlist *pls_b)
1526 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
1527 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
1529 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
1532 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
1534 HLSContext *c = s->priv_data;
1535 int ret, i, minplaylist = -1;
1537 recheck_discard_flags(s, c->first_packet);
1539 for (i = 0; i < c->n_playlists; i++) {
1540 struct playlist *pls = c->playlists[i];
1541 /* Make sure we've got one buffered packet from each open playlist
1543 if (pls->needed && !pls->pkt.data) {
1547 ret = av_read_frame(pls->ctx, &pls->pkt);
1549 if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
1551 reset_packet(&pls->pkt);
1554 /* stream_index check prevents matching picture attachments etc. */
1555 if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
1556 /* audio elementary streams are id3 timestamped */
1557 fill_timing_for_id3_timestamped_stream(pls);
1560 if (c->first_timestamp == AV_NOPTS_VALUE &&
1561 pls->pkt.dts != AV_NOPTS_VALUE)
1562 c->first_timestamp = av_rescale_q(pls->pkt.dts,
1563 get_timebase(pls), AV_TIME_BASE_Q);
1566 if (pls->seek_timestamp == AV_NOPTS_VALUE)
1569 if (pls->seek_stream_index < 0 ||
1570 pls->seek_stream_index == pls->pkt.stream_index) {
1572 if (pls->pkt.dts == AV_NOPTS_VALUE) {
1573 pls->seek_timestamp = AV_NOPTS_VALUE;
1577 tb = get_timebase(pls);
1578 ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
1579 tb.den, AV_ROUND_DOWN) -
1580 pls->seek_timestamp;
1581 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
1582 pls->pkt.flags & AV_PKT_FLAG_KEY)) {
1583 pls->seek_timestamp = AV_NOPTS_VALUE;
1587 av_free_packet(&pls->pkt);
1588 reset_packet(&pls->pkt);
1591 /* Check if this stream has the packet with the lowest dts */
1592 if (pls->pkt.data) {
1593 struct playlist *minpls = minplaylist < 0 ?
1594 NULL : c->playlists[minplaylist];
1595 if (minplaylist < 0) {
1598 int64_t dts = pls->pkt.dts;
1599 int64_t mindts = minpls->pkt.dts;
1601 if (dts == AV_NOPTS_VALUE ||
1602 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
1608 /* If we got a packet, return it */
1609 if (minplaylist >= 0) {
1610 struct playlist *pls = c->playlists[minplaylist];
1612 pkt->stream_index += pls->stream_offset;
1613 reset_packet(&c->playlists[minplaylist]->pkt);
1615 if (pkt->dts != AV_NOPTS_VALUE)
1616 c->cur_timestamp = av_rescale_q(pkt->dts,
1617 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1625 static int hls_close(AVFormatContext *s)
1627 HLSContext *c = s->priv_data;
1629 free_playlist_list(c);
1630 free_variant_list(c);
1631 free_rendition_list(c);
1635 static int hls_read_seek(AVFormatContext *s, int stream_index,
1636 int64_t timestamp, int flags)
1638 HLSContext *c = s->priv_data;
1639 struct playlist *seek_pls = NULL;
1641 int64_t first_timestamp, seek_timestamp, duration;
1643 if ((flags & AVSEEK_FLAG_BYTE) ||
1644 !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
1645 return AVERROR(ENOSYS);
1647 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
1648 0 : c->first_timestamp;
1650 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
1651 s->streams[stream_index]->time_base.den,
1652 flags & AVSEEK_FLAG_BACKWARD ?
1653 AV_ROUND_DOWN : AV_ROUND_UP);
1655 duration = s->duration == AV_NOPTS_VALUE ?
1658 if (0 < duration && duration < seek_timestamp - first_timestamp)
1659 return AVERROR(EIO);
1661 /* find the playlist with the specified stream */
1662 for (i = 0; i < c->n_playlists; i++) {
1663 struct playlist *pls = c->playlists[i];
1664 if (stream_index >= pls->stream_offset &&
1665 stream_index - pls->stream_offset < pls->ctx->nb_streams) {
1670 /* check if the timestamp is valid for the playlist with the
1671 * specified stream index */
1672 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
1673 return AVERROR(EIO);
1675 /* set segment now so we do not need to search again below */
1676 seek_pls->cur_seq_no = seq_no;
1677 seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset;
1679 for (i = 0; i < c->n_playlists; i++) {
1681 struct playlist *pls = c->playlists[i];
1683 ffurl_close(pls->input);
1686 av_free_packet(&pls->pkt);
1687 reset_packet(&pls->pkt);
1688 pls->pb.eof_reached = 0;
1689 /* Clear any buffered data */
1690 pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
1691 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
1693 /* Flush the packet queue of the subdemuxer. */
1694 ff_read_frame_flush(pls->ctx);
1696 pls->seek_timestamp = seek_timestamp;
1697 pls->seek_flags = flags;
1699 if (pls != seek_pls) {
1700 /* set closest segment seq_no for playlists not handled above */
1701 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
1702 /* seek the playlist to the given position without taking
1703 * keyframes into account since this playlist does not have the
1704 * specified stream where we should look for the keyframes */
1705 pls->seek_stream_index = -1;
1706 pls->seek_flags |= AVSEEK_FLAG_ANY;
1710 c->cur_timestamp = seek_timestamp;
1715 static int hls_probe(AVProbeData *p)
1717 /* Require #EXTM3U at the start, and either one of the ones below
1718 * somewhere for a proper match. */
1719 if (strncmp(p->buf, "#EXTM3U", 7))
1721 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
1722 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
1723 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
1724 return AVPROBE_SCORE_MAX;
1728 #define OFFSET(x) offsetof(HLSContext, x)
1729 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
1730 static const AVOption hls_options[] = {
1731 {"live_start_index", "segment index to start live streams at (negative values are from the end)",
1732 OFFSET(live_start_index), FF_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
1736 static const AVClass hls_class = {
1737 .class_name = "hls,applehttp",
1738 .item_name = av_default_item_name,
1739 .option = hls_options,
1740 .version = LIBAVUTIL_VERSION_INT,
1743 AVInputFormat ff_hls_demuxer = {
1744 .name = "hls,applehttp",
1745 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
1746 .priv_class = &hls_class,
1747 .priv_data_size = sizeof(HLSContext),
1748 .read_probe = hls_probe,
1749 .read_header = hls_read_header,
1750 .read_packet = hls_read_packet,
1751 .read_close = hls_close,
1752 .read_seek = hls_read_seek,