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 {
169 struct variant **variants;
171 struct playlist **playlists;
173 struct rendition **renditions;
177 int64_t first_timestamp;
178 int64_t cur_timestamp;
179 AVIOInterruptCB *interrupt_callback;
180 char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
181 char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
182 char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context
185 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
187 int len = ff_get_line(s, buf, maxlen);
188 while (len > 0 && av_isspace(buf[len - 1]))
193 static void free_segment_list(struct playlist *pls)
196 for (i = 0; i < pls->n_segments; i++) {
197 av_freep(&pls->segments[i]->key);
198 av_freep(&pls->segments[i]->url);
199 av_freep(&pls->segments[i]);
201 av_freep(&pls->segments);
205 static void free_playlist_list(HLSContext *c)
208 for (i = 0; i < c->n_playlists; i++) {
209 struct playlist *pls = c->playlists[i];
210 free_segment_list(pls);
211 av_freep(&pls->renditions);
212 av_freep(&pls->id3_buf);
213 av_dict_free(&pls->id3_initial);
214 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
215 av_free_packet(&pls->pkt);
216 av_freep(&pls->pb.buffer);
218 ffurl_close(pls->input);
221 avformat_close_input(&pls->ctx);
225 av_freep(&c->playlists);
226 av_freep(&c->cookies);
227 av_freep(&c->user_agent);
231 static void free_variant_list(HLSContext *c)
234 for (i = 0; i < c->n_variants; i++) {
235 struct variant *var = c->variants[i];
236 av_freep(&var->playlists);
239 av_freep(&c->variants);
243 static void free_rendition_list(HLSContext *c)
246 for (i = 0; i < c->n_renditions; i++)
247 av_freep(&c->renditions[i]);
248 av_freep(&c->renditions);
253 * Used to reset a statically allocated AVPacket to a clean slate,
254 * containing no data.
256 static void reset_packet(AVPacket *pkt)
262 static struct playlist *new_playlist(HLSContext *c, const char *url,
265 struct playlist *pls = av_mallocz(sizeof(struct playlist));
268 reset_packet(&pls->pkt);
269 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
270 pls->seek_timestamp = AV_NOPTS_VALUE;
272 pls->is_id3_timestamped = -1;
273 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
275 dynarray_add(&c->playlists, &c->n_playlists, pls);
279 struct variant_info {
281 /* variant group ids: */
282 char audio[MAX_FIELD_LEN];
283 char video[MAX_FIELD_LEN];
284 char subtitles[MAX_FIELD_LEN];
287 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
288 const char *url, const char *base)
291 struct playlist *pls;
293 pls = new_playlist(c, url, base);
297 var = av_mallocz(sizeof(struct variant));
302 var->bandwidth = atoi(info->bandwidth);
303 strcpy(var->audio_group, info->audio);
304 strcpy(var->video_group, info->video);
305 strcpy(var->subtitles_group, info->subtitles);
308 dynarray_add(&c->variants, &c->n_variants, var);
309 dynarray_add(&var->playlists, &var->n_playlists, pls);
313 static void handle_variant_args(struct variant_info *info, const char *key,
314 int key_len, char **dest, int *dest_len)
316 if (!strncmp(key, "BANDWIDTH=", key_len)) {
317 *dest = info->bandwidth;
318 *dest_len = sizeof(info->bandwidth);
319 } else if (!strncmp(key, "AUDIO=", key_len)) {
321 *dest_len = sizeof(info->audio);
322 } else if (!strncmp(key, "VIDEO=", key_len)) {
324 *dest_len = sizeof(info->video);
325 } else if (!strncmp(key, "SUBTITLES=", key_len)) {
326 *dest = info->subtitles;
327 *dest_len = sizeof(info->subtitles);
332 char uri[MAX_URL_SIZE];
337 static void handle_key_args(struct key_info *info, const char *key,
338 int key_len, char **dest, int *dest_len)
340 if (!strncmp(key, "METHOD=", key_len)) {
341 *dest = info->method;
342 *dest_len = sizeof(info->method);
343 } else if (!strncmp(key, "URI=", key_len)) {
345 *dest_len = sizeof(info->uri);
346 } else if (!strncmp(key, "IV=", key_len)) {
348 *dest_len = sizeof(info->iv);
352 struct rendition_info {
354 char uri[MAX_URL_SIZE];
355 char group_id[MAX_FIELD_LEN];
356 char language[MAX_FIELD_LEN];
357 char assoc_language[MAX_FIELD_LEN];
358 char name[MAX_FIELD_LEN];
361 char characteristics[MAX_CHARACTERISTICS_LEN];
364 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
365 const char *url_base)
367 struct rendition *rend;
368 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
369 char *characteristic;
373 if (!strcmp(info->type, "AUDIO"))
374 type = AVMEDIA_TYPE_AUDIO;
375 else if (!strcmp(info->type, "VIDEO"))
376 type = AVMEDIA_TYPE_VIDEO;
377 else if (!strcmp(info->type, "SUBTITLES"))
378 type = AVMEDIA_TYPE_SUBTITLE;
379 else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
380 /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
381 * AVC SEI RBSP anyway */
384 if (type == AVMEDIA_TYPE_UNKNOWN)
387 /* URI is mandatory for subtitles as per spec */
388 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
391 /* TODO: handle subtitles (each segment has to parsed separately) */
392 if (type == AVMEDIA_TYPE_SUBTITLE)
395 rend = av_mallocz(sizeof(struct rendition));
399 dynarray_add(&c->renditions, &c->n_renditions, rend);
402 strcpy(rend->group_id, info->group_id);
403 strcpy(rend->language, info->language);
404 strcpy(rend->name, info->name);
406 /* add the playlist if this is an external rendition */
408 rend->playlist = new_playlist(c, info->uri, url_base);
410 dynarray_add(&rend->playlist->renditions,
411 &rend->playlist->n_renditions, rend);
414 if (info->assoc_language[0]) {
415 int langlen = strlen(rend->language);
416 if (langlen < sizeof(rend->language) - 3) {
417 rend->language[langlen] = ',';
418 strncpy(rend->language + langlen + 1, info->assoc_language,
419 sizeof(rend->language) - langlen - 2);
423 if (!strcmp(info->defaultr, "YES"))
424 rend->disposition |= AV_DISPOSITION_DEFAULT;
425 if (!strcmp(info->forced, "YES"))
426 rend->disposition |= AV_DISPOSITION_FORCED;
428 chr_ptr = info->characteristics;
429 while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
430 if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
431 rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
432 else if (!strcmp(characteristic, "public.accessibility.describes-video"))
433 rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
441 static void handle_rendition_args(struct rendition_info *info, const char *key,
442 int key_len, char **dest, int *dest_len)
444 if (!strncmp(key, "TYPE=", key_len)) {
446 *dest_len = sizeof(info->type);
447 } else if (!strncmp(key, "URI=", key_len)) {
449 *dest_len = sizeof(info->uri);
450 } else if (!strncmp(key, "GROUP-ID=", key_len)) {
451 *dest = info->group_id;
452 *dest_len = sizeof(info->group_id);
453 } else if (!strncmp(key, "LANGUAGE=", key_len)) {
454 *dest = info->language;
455 *dest_len = sizeof(info->language);
456 } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
457 *dest = info->assoc_language;
458 *dest_len = sizeof(info->assoc_language);
459 } else if (!strncmp(key, "NAME=", key_len)) {
461 *dest_len = sizeof(info->name);
462 } else if (!strncmp(key, "DEFAULT=", key_len)) {
463 *dest = info->defaultr;
464 *dest_len = sizeof(info->defaultr);
465 } else if (!strncmp(key, "FORCED=", key_len)) {
466 *dest = info->forced;
467 *dest_len = sizeof(info->forced);
468 } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
469 *dest = info->characteristics;
470 *dest_len = sizeof(info->characteristics);
474 * - AUTOSELECT: client may autoselect based on e.g. system language
475 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
479 /* used by parse_playlist to allocate a new variant+playlist when the
480 * playlist is detected to be a Media Playlist (not Master Playlist)
481 * and we have no parent Master Playlist (parsing of which would have
482 * allocated the variant and playlist already) */
483 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
487 if (!new_variant(c, NULL, url, NULL))
488 return AVERROR(ENOMEM);
489 *pls = c->playlists[c->n_playlists - 1];
493 /* pls = NULL => Master Playlist or parentless Media Playlist
494 * pls = !NULL => parented Media Playlist, playlist+variant allocated */
495 static int parse_playlist(HLSContext *c, const char *url,
496 struct playlist *pls, AVIOContext *in)
498 int ret = 0, is_segment = 0, is_variant = 0;
499 int64_t duration = 0;
500 enum KeyType key_type = KEY_NONE;
503 char key[MAX_URL_SIZE] = "";
504 char line[MAX_URL_SIZE];
507 int64_t seg_offset = 0;
508 int64_t seg_size = -1;
509 uint8_t *new_url = NULL;
510 struct variant_info variant_info;
511 char tmp_str[MAX_URL_SIZE];
514 AVDictionary *opts = NULL;
516 /* Some HLS servers don't like being sent the range header */
517 av_dict_set(&opts, "seekable", "0", 0);
519 // broker prior HTTP options that should be consistent across requests
520 av_dict_set(&opts, "user-agent", c->user_agent, 0);
521 av_dict_set(&opts, "cookies", c->cookies, 0);
522 av_dict_set(&opts, "headers", c->headers, 0);
524 ret = avio_open2(&in, url, AVIO_FLAG_READ,
525 c->interrupt_callback, &opts);
531 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
534 read_chomp_line(in, line, sizeof(line));
535 if (strcmp(line, "#EXTM3U")) {
536 ret = AVERROR_INVALIDDATA;
541 free_segment_list(pls);
543 pls->type = PLS_TYPE_UNSPECIFIED;
545 while (!avio_feof(in)) {
546 read_chomp_line(in, line, sizeof(line));
547 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
549 memset(&variant_info, 0, sizeof(variant_info));
550 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
552 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
553 struct key_info info = {{0}};
554 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
558 if (!strcmp(info.method, "AES-128"))
559 key_type = KEY_AES_128;
560 if (!strcmp(info.method, "SAMPLE-AES"))
561 key_type = KEY_SAMPLE_AES;
562 if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
563 ff_hex_to_data(iv, info.iv + 2);
566 av_strlcpy(key, info.uri, sizeof(key));
567 } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
568 struct rendition_info info = {{0}};
569 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
571 new_rendition(c, &info, url);
572 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
573 ret = ensure_playlist(c, &pls, url);
576 pls->target_duration = atoi(ptr) * AV_TIME_BASE;
577 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
578 ret = ensure_playlist(c, &pls, url);
581 pls->start_seq_no = atoi(ptr);
582 } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
583 ret = ensure_playlist(c, &pls, url);
586 if (!strcmp(ptr, "EVENT"))
587 pls->type = PLS_TYPE_EVENT;
588 else if (!strcmp(ptr, "VOD"))
589 pls->type = PLS_TYPE_VOD;
590 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
593 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
595 duration = atof(ptr) * AV_TIME_BASE;
596 } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
597 seg_size = atoi(ptr);
598 ptr = strchr(ptr, '@');
600 seg_offset = atoi(ptr+1);
601 } else if (av_strstart(line, "#", NULL)) {
603 } else if (line[0]) {
605 if (!new_variant(c, &variant_info, line, url)) {
606 ret = AVERROR(ENOMEM);
614 if (!new_variant(c, 0, url, NULL)) {
615 ret = AVERROR(ENOMEM);
618 pls = c->playlists[c->n_playlists - 1];
620 seg = av_malloc(sizeof(struct segment));
622 ret = AVERROR(ENOMEM);
625 seg->duration = duration;
626 seg->key_type = key_type;
628 memcpy(seg->iv, iv, sizeof(iv));
630 int seq = pls->start_seq_no + pls->n_segments;
631 memset(seg->iv, 0, sizeof(seg->iv));
632 AV_WB32(seg->iv + 12, seq);
635 if (key_type != KEY_NONE) {
636 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
637 seg->key = av_strdup(tmp_str);
640 ret = AVERROR(ENOMEM);
647 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
648 seg->url = av_strdup(tmp_str);
652 ret = AVERROR(ENOMEM);
656 dynarray_add(&pls->segments, &pls->n_segments, seg);
659 seg->size = seg_size;
661 seg->url_offset = seg_offset;
662 seg_offset += seg_size;
672 pls->last_load_time = av_gettime_relative();
681 enum ReadFromURLMode {
686 /* read from URLContext, limiting read to current segment */
687 static int read_from_url(struct playlist *pls, uint8_t *buf, int buf_size,
688 enum ReadFromURLMode mode)
691 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
693 /* limit read if the segment was only a part of a file */
695 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
697 if (mode == READ_COMPLETE)
698 ret = ffurl_read_complete(pls->input, buf, buf_size);
700 ret = ffurl_read(pls->input, buf, buf_size);
703 pls->cur_seg_offset += ret;
708 /* Parse the raw ID3 data and pass contents to caller */
709 static void parse_id3(AVFormatContext *s, AVIOContext *pb,
710 AVDictionary **metadata, int64_t *dts,
711 ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
713 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
714 ID3v2ExtraMeta *meta;
716 ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
717 for (meta = *extra_meta; meta; meta = meta->next) {
718 if (!strcmp(meta->tag, "PRIV")) {
719 ID3v2ExtraMetaPRIV *priv = meta->data;
720 if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
721 /* 33-bit MPEG timestamp */
722 int64_t ts = AV_RB64(priv->data);
723 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
724 if ((ts & ~((1ULL << 33) - 1)) == 0)
727 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
729 } else if (!strcmp(meta->tag, "APIC") && apic)
734 /* Check if the ID3 metadata contents have changed */
735 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
736 ID3v2ExtraMetaAPIC *apic)
738 AVDictionaryEntry *entry = NULL;
739 AVDictionaryEntry *oldentry;
740 /* check that no keys have changed values */
741 while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
742 oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
743 if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
747 /* check if apic appeared */
748 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
752 int size = pls->ctx->streams[1]->attached_pic.size;
753 if (size != apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE)
756 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
763 /* Parse ID3 data and handle the found data */
764 static void handle_id3(AVIOContext *pb, struct playlist *pls)
766 AVDictionary *metadata = NULL;
767 ID3v2ExtraMetaAPIC *apic = NULL;
768 ID3v2ExtraMeta *extra_meta = NULL;
769 int64_t timestamp = AV_NOPTS_VALUE;
771 parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta);
773 if (timestamp != AV_NOPTS_VALUE) {
774 pls->id3_mpegts_timestamp = timestamp;
778 if (!pls->id3_found) {
779 /* initial ID3 tags */
780 av_assert0(!pls->id3_deferred_extra);
783 /* get picture attachment and set text metadata */
784 if (pls->ctx->nb_streams)
785 ff_id3v2_parse_apic(pls->ctx, &extra_meta);
787 /* demuxer not yet opened, defer picture attachment */
788 pls->id3_deferred_extra = extra_meta;
790 av_dict_copy(&pls->ctx->metadata, metadata, 0);
791 pls->id3_initial = metadata;
794 if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
795 avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
796 pls->id3_changed = 1;
798 av_dict_free(&metadata);
801 if (!pls->id3_deferred_extra)
802 ff_id3v2_free_extra_meta(&extra_meta);
805 /* Intercept and handle ID3 tags between URLContext and AVIOContext */
806 static void intercept_id3(struct playlist *pls, uint8_t *buf,
807 int buf_size, int *len)
809 /* intercept id3 tags, we do not want to pass them to the raw
810 * demuxer on all segment switches */
815 /* gather all the id3 tags */
817 /* see if we can retrieve enough data for ID3 header */
818 if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
819 bytes = read_from_url(pls, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE);
822 if (bytes == ID3v2_HEADER_SIZE - *len)
823 /* no EOF yet, so fill the caller buffer again after
824 * we have stripped the ID3 tags */
829 } else if (*len <= 0) {
836 if (*len < ID3v2_HEADER_SIZE)
839 if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
840 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
841 int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
842 int taglen = ff_id3v2_tag_len(buf);
843 int tag_got_bytes = FFMIN(taglen, *len);
844 int remaining = taglen - tag_got_bytes;
846 if (taglen > maxsize) {
847 av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
853 * Copy the id3 tag to our temporary id3 buffer.
854 * We could read a small id3 tag directly without memcpy, but
855 * we would still need to copy the large tags, and handling
856 * both of those cases together with the possibility for multiple
857 * tags would make the handling a bit complex.
859 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
862 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
863 id3_buf_pos += tag_got_bytes;
865 /* strip the intercepted bytes */
866 *len -= tag_got_bytes;
867 memmove(buf, buf + tag_got_bytes, *len);
868 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
871 /* read the rest of the tag in */
872 if (read_from_url(pls, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
874 id3_buf_pos += remaining;
875 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
879 /* no more ID3 tags */
884 /* re-fill buffer for the caller unless EOF */
885 if (*len >= 0 && (fill_buf || *len == 0)) {
886 bytes = read_from_url(pls, buf + *len, buf_size - *len, READ_NORMAL);
888 /* ignore error if we already had some data */
896 /* Now parse all the ID3 tags */
897 AVIOContext id3ioctx;
898 ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
899 handle_id3(&id3ioctx, pls);
902 if (pls->is_id3_timestamped == -1)
903 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
906 static void update_options(char **dest, const char *name, void *src)
909 av_opt_get(src, name, 0, (uint8_t**)dest);
910 if (*dest && !strlen(*dest))
914 static int open_input(HLSContext *c, struct playlist *pls)
916 AVDictionary *opts = NULL;
917 AVDictionary *opts2 = NULL;
919 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
921 // broker prior HTTP options that should be consistent across requests
922 av_dict_set(&opts, "user-agent", c->user_agent, 0);
923 av_dict_set(&opts, "cookies", c->cookies, 0);
924 av_dict_set(&opts, "headers", c->headers, 0);
925 av_dict_set(&opts, "seekable", "0", 0);
927 // Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice)
928 av_dict_copy(&opts2, opts, 0);
930 if (seg->size >= 0) {
931 /* try to restrict the HTTP request to the part we want
932 * (if this is in fact a HTTP request) */
933 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
934 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
937 av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
938 seg->url, seg->url_offset, pls->index);
940 if (seg->key_type == KEY_NONE) {
941 ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ,
942 &pls->parent->interrupt_callback, &opts);
944 } else if (seg->key_type == KEY_AES_128) {
945 char iv[33], key[33], url[MAX_URL_SIZE];
946 if (strcmp(seg->key, pls->key_url)) {
948 if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
949 &pls->parent->interrupt_callback, &opts2) == 0) {
950 if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
951 != sizeof(pls->key)) {
952 av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
955 update_options(&c->cookies, "cookies", uc->priv_data);
956 av_dict_set(&opts, "cookies", c->cookies, 0);
959 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
962 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
964 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
965 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
966 iv[32] = key[32] = '\0';
967 if (strstr(seg->url, "://"))
968 snprintf(url, sizeof(url), "crypto+%s", seg->url);
970 snprintf(url, sizeof(url), "crypto:%s", seg->url);
971 if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ,
972 &pls->parent->interrupt_callback)) < 0)
974 av_opt_set(pls->input->priv_data, "key", key, 0);
975 av_opt_set(pls->input->priv_data, "iv", iv, 0);
977 if ((ret = ffurl_connect(pls->input, &opts)) < 0) {
978 ffurl_close(pls->input);
983 } else if (seg->key_type == KEY_SAMPLE_AES) {
984 av_log(pls->parent, AV_LOG_ERROR,
985 "SAMPLE-AES encryption is not supported yet\n");
986 ret = AVERROR_PATCHWELCOME;
989 ret = AVERROR(ENOSYS);
991 /* Seek to the requested position. If this was a HTTP request, the offset
992 * should already be where want it to, but this allows e.g. local testing
993 * without a HTTP server. */
994 if (ret == 0 && seg->key_type == KEY_NONE) {
995 int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET);
997 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
999 ffurl_close(pls->input);
1005 av_dict_free(&opts);
1006 av_dict_free(&opts2);
1007 pls->cur_seg_offset = 0;
1011 static int64_t default_reload_interval(struct playlist *pls)
1013 return pls->n_segments > 0 ?
1014 pls->segments[pls->n_segments - 1]->duration :
1015 pls->target_duration;
1018 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1020 struct playlist *v = opaque;
1021 HLSContext *c = v->parent->priv_data;
1023 int just_opened = 0;
1030 int64_t reload_interval;
1032 /* Check that the playlist is still needed before opening a new
1034 if (v->ctx && v->ctx->nb_streams &&
1035 v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
1037 for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
1039 if (v->parent->streams[i]->discard < AVDISCARD_ALL)
1044 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
1049 /* If this is a live stream and the reload interval has elapsed since
1050 * the last playlist reload, reload the playlists now. */
1051 reload_interval = default_reload_interval(v);
1055 av_gettime_relative() - v->last_load_time >= reload_interval) {
1056 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1057 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1061 /* If we need to reload the playlist again below (if
1062 * there's still no more segments), switch to a reload
1063 * interval of half the target duration. */
1064 reload_interval = v->target_duration / 2;
1066 if (v->cur_seq_no < v->start_seq_no) {
1067 av_log(NULL, AV_LOG_WARNING,
1068 "skipping %d segments ahead, expired from playlists\n",
1069 v->start_seq_no - v->cur_seq_no);
1070 v->cur_seq_no = v->start_seq_no;
1072 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1075 while (av_gettime_relative() - v->last_load_time < reload_interval) {
1076 if (ff_check_interrupt(c->interrupt_callback))
1077 return AVERROR_EXIT;
1078 av_usleep(100*1000);
1080 /* Enough time has elapsed since the last reload */
1084 ret = open_input(c, v);
1086 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
1093 ret = read_from_url(v, buf, buf_size, READ_NORMAL);
1095 if (just_opened && v->is_id3_timestamped != 0) {
1096 /* Intercept ID3 tags here, elementary audio streams are required
1097 * to convey timestamps using them in the beginning of each segment. */
1098 intercept_id3(v, buf, buf_size, &ret);
1103 ffurl_close(v->input);
1107 c->cur_seq_no = v->cur_seq_no;
1112 static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls)
1114 int variant_count = 0;
1117 for (i = 0; i < c->n_variants && variant_count < 2; i++) {
1118 struct variant *v = c->variants[i];
1120 for (j = 0; j < v->n_playlists; j++) {
1121 if (v->playlists[j] == pls) {
1128 return variant_count >= 2;
1131 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1132 enum AVMediaType type, const char *group_id)
1136 for (i = 0; i < c->n_renditions; i++) {
1137 struct rendition *rend = c->renditions[i];
1139 if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1142 /* rendition is an external playlist
1143 * => add the playlist to the variant */
1144 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1146 /* rendition is part of the variant main Media Playlist
1147 * => add the rendition to the main Media Playlist */
1148 dynarray_add(&var->playlists[0]->renditions,
1149 &var->playlists[0]->n_renditions,
1155 static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1156 enum AVMediaType type)
1161 for (i = 0; i < pls->ctx->nb_streams; i++) {
1162 AVStream *st = s->streams[pls->stream_offset + i];
1164 if (st->codec->codec_type != type)
1167 for (; rend_idx < pls->n_renditions; rend_idx++) {
1168 struct rendition *rend = pls->renditions[rend_idx];
1170 if (rend->type != type)
1173 if (rend->language[0])
1174 av_dict_set(&st->metadata, "language", rend->language, 0);
1176 av_dict_set(&st->metadata, "comment", rend->name, 0);
1178 st->disposition |= rend->disposition;
1180 if (rend_idx >=pls->n_renditions)
1185 /* if timestamp was in valid range: returns 1 and sets seq_no
1186 * if not: returns 0 and sets seq_no to closest segment */
1187 static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
1188 int64_t timestamp, int *seq_no)
1191 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1192 0 : c->first_timestamp;
1194 if (timestamp < pos) {
1195 *seq_no = pls->start_seq_no;
1199 for (i = 0; i < pls->n_segments; i++) {
1200 int64_t diff = pos + pls->segments[i]->duration - timestamp;
1202 *seq_no = pls->start_seq_no + i;
1205 pos += pls->segments[i]->duration;
1208 *seq_no = pls->start_seq_no + pls->n_segments - 1;
1213 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1217 if (!pls->finished && !c->first_packet &&
1218 av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
1219 /* reload the playlist since it was suspended */
1220 parse_playlist(c, pls->url, pls, NULL);
1222 /* If playback is already in progress (we are just selecting a new
1223 * playlist) and this is a complete file, find the matching segment
1224 * by counting durations. */
1225 if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1226 find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1230 if (!pls->finished) {
1231 if (!c->first_packet && /* we are doing a segment selection during playback */
1232 c->cur_seq_no >= pls->start_seq_no &&
1233 c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1234 /* While spec 3.4.3 says that we cannot assume anything about the
1235 * content at the same sequence number on different playlists,
1236 * in practice this seems to work and doing it otherwise would
1237 * require us to download a segment to inspect its timestamps. */
1238 return c->cur_seq_no;
1240 /* If this is a live stream with more than 3 segments, start at the
1241 * third last segment. */
1242 if (pls->n_segments > 3)
1243 return pls->start_seq_no + pls->n_segments - 3;
1246 /* Otherwise just start on the first segment. */
1247 return pls->start_seq_no;
1250 static int hls_read_header(AVFormatContext *s)
1252 URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
1253 HLSContext *c = s->priv_data;
1254 int ret = 0, i, j, stream_offset = 0;
1256 c->interrupt_callback = &s->interrupt_callback;
1258 c->first_packet = 1;
1259 c->first_timestamp = AV_NOPTS_VALUE;
1260 c->cur_timestamp = AV_NOPTS_VALUE;
1262 // if the URL context is good, read important options we must broker later
1263 if (u && u->prot->priv_data_class) {
1264 // get the previous user agent & set back to null if string size is zero
1265 update_options(&c->user_agent, "user-agent", u->priv_data);
1267 // get the previous cookies & set back to null if string size is zero
1268 update_options(&c->cookies, "cookies", u->priv_data);
1270 // get the previous headers & set back to null if string size is zero
1271 update_options(&c->headers, "headers", u->priv_data);
1274 if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
1277 if (c->n_variants == 0) {
1278 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1282 /* If the playlist only contained playlists (Master Playlist),
1283 * parse each individual playlist. */
1284 if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1285 for (i = 0; i < c->n_playlists; i++) {
1286 struct playlist *pls = c->playlists[i];
1287 if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
1292 if (c->variants[0]->playlists[0]->n_segments == 0) {
1293 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1298 /* If this isn't a live stream, calculate the total duration of the
1300 if (c->variants[0]->playlists[0]->finished) {
1301 int64_t duration = 0;
1302 for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1303 duration += c->variants[0]->playlists[0]->segments[i]->duration;
1304 s->duration = duration;
1307 /* Associate renditions with variants */
1308 for (i = 0; i < c->n_variants; i++) {
1309 struct variant *var = c->variants[i];
1311 if (var->audio_group[0])
1312 add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
1313 if (var->video_group[0])
1314 add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
1315 if (var->subtitles_group[0])
1316 add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
1319 /* Open the demuxer for each playlist */
1320 for (i = 0; i < c->n_playlists; i++) {
1321 struct playlist *pls = c->playlists[i];
1322 AVInputFormat *in_fmt = NULL;
1324 if (!(pls->ctx = avformat_alloc_context())) {
1325 ret = AVERROR(ENOMEM);
1329 if (pls->n_segments == 0)
1335 pls->cur_seq_no = select_cur_seq_no(c, pls);
1337 pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1338 ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1339 read_data, NULL, NULL);
1340 pls->pb.seekable = 0;
1341 ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1344 /* Free the ctx - it isn't initialized properly at this point,
1345 * so avformat_close_input shouldn't be called. If
1346 * avformat_open_input fails below, it frees and zeros the
1347 * context, so it doesn't need any special treatment like this. */
1348 av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1349 avformat_free_context(pls->ctx);
1353 pls->ctx->pb = &pls->pb;
1354 pls->stream_offset = stream_offset;
1356 if ((ret = ff_copy_whitelists(pls->ctx, s)) < 0)
1359 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1363 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1364 ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
1365 avformat_queue_attached_pictures(pls->ctx);
1366 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
1367 pls->id3_deferred_extra = NULL;
1370 pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
1371 ret = avformat_find_stream_info(pls->ctx, NULL);
1375 if (pls->is_id3_timestamped == -1)
1376 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1378 /* Create new AVStreams for each stream in this playlist */
1379 for (j = 0; j < pls->ctx->nb_streams; j++) {
1380 AVStream *st = avformat_new_stream(s, NULL);
1381 AVStream *ist = pls->ctx->streams[j];
1383 ret = AVERROR(ENOMEM);
1388 avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
1390 if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1391 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1393 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1396 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
1397 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
1398 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
1400 stream_offset += pls->ctx->nb_streams;
1403 /* Create a program for each variant */
1404 for (i = 0; i < c->n_variants; i++) {
1405 struct variant *v = c->variants[i];
1408 program = av_new_program(s, i);
1411 av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1413 for (j = 0; j < v->n_playlists; j++) {
1414 struct playlist *pls = v->playlists[j];
1415 int is_shared = playlist_in_multiple_variants(c, pls);
1418 for (k = 0; k < pls->ctx->nb_streams; k++) {
1419 struct AVStream *st = s->streams[pls->stream_offset + k];
1421 ff_program_add_stream_index(s, i, pls->stream_offset + k);
1423 /* Set variant_bitrate for streams unique to this variant */
1424 if (!is_shared && v->bandwidth)
1425 av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0);
1432 free_playlist_list(c);
1433 free_variant_list(c);
1434 free_rendition_list(c);
1438 static int recheck_discard_flags(AVFormatContext *s, int first)
1440 HLSContext *c = s->priv_data;
1443 /* Check if any new streams are needed */
1444 for (i = 0; i < c->n_playlists; i++)
1445 c->playlists[i]->cur_needed = 0;
1447 for (i = 0; i < s->nb_streams; i++) {
1448 AVStream *st = s->streams[i];
1449 struct playlist *pls = c->playlists[s->streams[i]->id];
1450 if (st->discard < AVDISCARD_ALL)
1451 pls->cur_needed = 1;
1453 for (i = 0; i < c->n_playlists; i++) {
1454 struct playlist *pls = c->playlists[i];
1455 if (pls->cur_needed && !pls->needed) {
1458 pls->cur_seq_no = select_cur_seq_no(c, pls);
1459 pls->pb.eof_reached = 0;
1460 if (c->cur_timestamp != AV_NOPTS_VALUE) {
1462 pls->seek_timestamp = c->cur_timestamp;
1463 pls->seek_flags = AVSEEK_FLAG_ANY;
1464 pls->seek_stream_index = -1;
1466 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
1467 } else if (first && !pls->cur_needed && pls->needed) {
1469 ffurl_close(pls->input);
1473 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
1479 static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
1481 if (pls->id3_offset >= 0) {
1482 pls->pkt.dts = pls->id3_mpegts_timestamp +
1483 av_rescale_q(pls->id3_offset,
1484 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1486 if (pls->pkt.duration)
1487 pls->id3_offset += pls->pkt.duration;
1489 pls->id3_offset = -1;
1491 /* there have been packets with unknown duration
1492 * since the last id3 tag, should not normally happen */
1493 pls->pkt.dts = AV_NOPTS_VALUE;
1496 if (pls->pkt.duration)
1497 pls->pkt.duration = av_rescale_q(pls->pkt.duration,
1498 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1501 pls->pkt.pts = AV_NOPTS_VALUE;
1504 static AVRational get_timebase(struct playlist *pls)
1506 if (pls->is_id3_timestamped)
1507 return MPEG_TIME_BASE_Q;
1509 return pls->ctx->streams[pls->pkt.stream_index]->time_base;
1512 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
1513 int64_t ts_b, struct playlist *pls_b)
1515 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
1516 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
1518 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
1521 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
1523 HLSContext *c = s->priv_data;
1524 int ret, i, minplaylist = -1;
1526 recheck_discard_flags(s, c->first_packet);
1528 for (i = 0; i < c->n_playlists; i++) {
1529 struct playlist *pls = c->playlists[i];
1530 /* Make sure we've got one buffered packet from each open playlist
1532 if (pls->needed && !pls->pkt.data) {
1536 ret = av_read_frame(pls->ctx, &pls->pkt);
1538 if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
1540 reset_packet(&pls->pkt);
1543 /* stream_index check prevents matching picture attachments etc. */
1544 if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
1545 /* audio elementary streams are id3 timestamped */
1546 fill_timing_for_id3_timestamped_stream(pls);
1549 if (c->first_timestamp == AV_NOPTS_VALUE &&
1550 pls->pkt.dts != AV_NOPTS_VALUE)
1551 c->first_timestamp = av_rescale_q(pls->pkt.dts,
1552 get_timebase(pls), AV_TIME_BASE_Q);
1555 if (pls->seek_timestamp == AV_NOPTS_VALUE)
1558 if (pls->seek_stream_index < 0 ||
1559 pls->seek_stream_index == pls->pkt.stream_index) {
1561 if (pls->pkt.dts == AV_NOPTS_VALUE) {
1562 pls->seek_timestamp = AV_NOPTS_VALUE;
1566 tb = get_timebase(pls);
1567 ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
1568 tb.den, AV_ROUND_DOWN) -
1569 pls->seek_timestamp;
1570 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
1571 pls->pkt.flags & AV_PKT_FLAG_KEY)) {
1572 pls->seek_timestamp = AV_NOPTS_VALUE;
1576 av_free_packet(&pls->pkt);
1577 reset_packet(&pls->pkt);
1580 /* Check if this stream has the packet with the lowest dts */
1581 if (pls->pkt.data) {
1582 struct playlist *minpls = minplaylist < 0 ?
1583 NULL : c->playlists[minplaylist];
1584 if (minplaylist < 0) {
1587 int64_t dts = pls->pkt.dts;
1588 int64_t mindts = minpls->pkt.dts;
1590 if (dts == AV_NOPTS_VALUE ||
1591 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
1597 /* If we got a packet, return it */
1598 if (minplaylist >= 0) {
1599 struct playlist *pls = c->playlists[minplaylist];
1601 pkt->stream_index += pls->stream_offset;
1602 reset_packet(&c->playlists[minplaylist]->pkt);
1604 if (pkt->dts != AV_NOPTS_VALUE)
1605 c->cur_timestamp = av_rescale_q(pkt->dts,
1606 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1614 static int hls_close(AVFormatContext *s)
1616 HLSContext *c = s->priv_data;
1618 free_playlist_list(c);
1619 free_variant_list(c);
1620 free_rendition_list(c);
1624 static int hls_read_seek(AVFormatContext *s, int stream_index,
1625 int64_t timestamp, int flags)
1627 HLSContext *c = s->priv_data;
1628 struct playlist *seek_pls = NULL;
1630 int64_t first_timestamp, seek_timestamp, duration;
1632 if ((flags & AVSEEK_FLAG_BYTE) ||
1633 !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
1634 return AVERROR(ENOSYS);
1636 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
1637 0 : c->first_timestamp;
1639 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
1640 s->streams[stream_index]->time_base.den,
1641 flags & AVSEEK_FLAG_BACKWARD ?
1642 AV_ROUND_DOWN : AV_ROUND_UP);
1644 duration = s->duration == AV_NOPTS_VALUE ?
1647 if (0 < duration && duration < seek_timestamp - first_timestamp)
1648 return AVERROR(EIO);
1650 /* find the playlist with the specified stream */
1651 for (i = 0; i < c->n_playlists; i++) {
1652 struct playlist *pls = c->playlists[i];
1653 if (stream_index >= pls->stream_offset &&
1654 stream_index - pls->stream_offset < pls->ctx->nb_streams) {
1659 /* check if the timestamp is valid for the playlist with the
1660 * specified stream index */
1661 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
1662 return AVERROR(EIO);
1664 /* set segment now so we do not need to search again below */
1665 seek_pls->cur_seq_no = seq_no;
1666 seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset;
1668 for (i = 0; i < c->n_playlists; i++) {
1670 struct playlist *pls = c->playlists[i];
1672 ffurl_close(pls->input);
1675 av_free_packet(&pls->pkt);
1676 reset_packet(&pls->pkt);
1677 pls->pb.eof_reached = 0;
1678 /* Clear any buffered data */
1679 pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
1680 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
1682 /* Flush the packet queue of the subdemuxer. */
1683 ff_read_frame_flush(pls->ctx);
1685 pls->seek_timestamp = seek_timestamp;
1686 pls->seek_flags = flags;
1688 if (pls != seek_pls) {
1689 /* set closest segment seq_no for playlists not handled above */
1690 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
1691 /* seek the playlist to the given position without taking
1692 * keyframes into account since this playlist does not have the
1693 * specified stream where we should look for the keyframes */
1694 pls->seek_stream_index = -1;
1695 pls->seek_flags |= AVSEEK_FLAG_ANY;
1699 c->cur_timestamp = seek_timestamp;
1704 static int hls_probe(AVProbeData *p)
1706 /* Require #EXTM3U at the start, and either one of the ones below
1707 * somewhere for a proper match. */
1708 if (strncmp(p->buf, "#EXTM3U", 7))
1710 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
1711 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
1712 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
1713 return AVPROBE_SCORE_MAX;
1717 AVInputFormat ff_hls_demuxer = {
1718 .name = "hls,applehttp",
1719 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
1720 .priv_data_size = sizeof(HLSContext),
1721 .read_probe = hls_probe,
1722 .read_header = hls_read_header,
1723 .read_packet = hls_read_packet,
1724 .read_close = hls_close,
1725 .read_seek = hls_read_seek,