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.
73 enum KeyType key_type;
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.
91 char url[MAX_URL_SIZE];
95 AVFormatContext *parent;
102 enum PlaylistType type;
103 int64_t target_duration;
106 struct segment **segments;
107 int needed, cur_needed;
109 int64_t cur_seg_offset;
110 int64_t last_load_time;
112 char key_url[MAX_URL_SIZE];
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 */
127 int64_t seek_timestamp;
129 int seek_stream_index; /* into subdemuxer stream array */
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. */
136 struct rendition **renditions;
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
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];
157 /* every variant contains at least the main Media Playlist in index 0 */
159 struct playlist **playlists;
161 char audio_group[MAX_FIELD_LEN];
162 char video_group[MAX_FIELD_LEN];
163 char subtitles_group[MAX_FIELD_LEN];
166 typedef struct HLSContext {
168 struct variant **variants;
170 struct playlist **playlists;
172 struct rendition **renditions;
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
184 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
186 int len = ff_get_line(s, buf, maxlen);
187 while (len > 0 && av_isspace(buf[len - 1]))
192 static void free_segment_list(struct playlist *pls)
195 for (i = 0; i < pls->n_segments; i++) {
196 av_freep(&pls->segments[i]->key);
197 av_freep(&pls->segments[i]->url);
198 av_freep(&pls->segments[i]);
200 av_freep(&pls->segments);
204 static void free_playlist_list(HLSContext *c)
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_freep(&pls->pb.buffer);
217 ffurl_close(pls->input);
220 avformat_close_input(&pls->ctx);
224 av_freep(&c->playlists);
225 av_freep(&c->cookies);
226 av_freep(&c->user_agent);
230 static void free_variant_list(HLSContext *c)
233 for (i = 0; i < c->n_variants; i++) {
234 struct variant *var = c->variants[i];
235 av_freep(&var->playlists);
238 av_freep(&c->variants);
242 static void free_rendition_list(HLSContext *c)
245 for (i = 0; i < c->n_renditions; i++)
246 av_freep(&c->renditions[i]);
247 av_freep(&c->renditions);
252 * Used to reset a statically allocated AVPacket to a clean slate,
253 * containing no data.
255 static void reset_packet(AVPacket *pkt)
261 static struct playlist *new_playlist(HLSContext *c, const char *url,
264 struct playlist *pls = av_mallocz(sizeof(struct playlist));
267 reset_packet(&pls->pkt);
268 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
269 pls->seek_timestamp = AV_NOPTS_VALUE;
271 pls->is_id3_timestamped = -1;
272 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
274 dynarray_add(&c->playlists, &c->n_playlists, pls);
278 struct variant_info {
280 /* variant group ids: */
281 char audio[MAX_FIELD_LEN];
282 char video[MAX_FIELD_LEN];
283 char subtitles[MAX_FIELD_LEN];
286 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
287 const char *url, const char *base)
290 struct playlist *pls;
292 pls = new_playlist(c, url, base);
296 var = av_mallocz(sizeof(struct variant));
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);
307 dynarray_add(&c->variants, &c->n_variants, var);
308 dynarray_add(&var->playlists, &var->n_playlists, pls);
312 static void handle_variant_args(struct variant_info *info, const char *key,
313 int key_len, char **dest, int *dest_len)
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)) {
320 *dest_len = sizeof(info->audio);
321 } else if (!strncmp(key, "VIDEO=", key_len)) {
323 *dest_len = sizeof(info->video);
324 } else if (!strncmp(key, "SUBTITLES=", key_len)) {
325 *dest = info->subtitles;
326 *dest_len = sizeof(info->subtitles);
331 char uri[MAX_URL_SIZE];
336 static void handle_key_args(struct key_info *info, const char *key,
337 int key_len, char **dest, int *dest_len)
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)) {
344 *dest_len = sizeof(info->uri);
345 } else if (!strncmp(key, "IV=", key_len)) {
347 *dest_len = sizeof(info->iv);
351 struct rendition_info {
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];
360 char characteristics[MAX_CHARACTERISTICS_LEN];
363 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
364 const char *url_base)
366 struct rendition *rend;
367 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
368 char *characteristic;
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 */
383 if (type == AVMEDIA_TYPE_UNKNOWN)
386 /* URI is mandatory for subtitles as per spec */
387 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
390 /* TODO: handle subtitles (each segment has to parsed separately) */
391 if (type == AVMEDIA_TYPE_SUBTITLE)
394 rend = av_mallocz(sizeof(struct rendition));
398 dynarray_add(&c->renditions, &c->n_renditions, rend);
401 strcpy(rend->group_id, info->group_id);
402 strcpy(rend->language, info->language);
403 strcpy(rend->name, info->name);
405 /* add the playlist if this is an external rendition */
407 rend->playlist = new_playlist(c, info->uri, url_base);
409 dynarray_add(&rend->playlist->renditions,
410 &rend->playlist->n_renditions, rend);
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);
422 if (!strcmp(info->defaultr, "YES"))
423 rend->disposition |= AV_DISPOSITION_DEFAULT;
424 if (!strcmp(info->forced, "YES"))
425 rend->disposition |= AV_DISPOSITION_FORCED;
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;
440 static void handle_rendition_args(struct rendition_info *info, const char *key,
441 int key_len, char **dest, int *dest_len)
443 if (!strncmp(key, "TYPE=", key_len)) {
445 *dest_len = sizeof(info->type);
446 } else if (!strncmp(key, "URI=", key_len)) {
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)) {
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);
473 * - AUTOSELECT: client may autoselect based on e.g. system language
474 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
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)
486 if (!new_variant(c, NULL, url, NULL))
487 return AVERROR(ENOMEM);
488 *pls = c->playlists[c->n_playlists - 1];
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)
497 int ret = 0, is_segment = 0, is_variant = 0;
498 int64_t duration = 0;
499 enum KeyType key_type = KEY_NONE;
502 char key[MAX_URL_SIZE] = "";
503 char line[MAX_URL_SIZE];
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];
513 AVDictionary *opts = NULL;
515 /* Some HLS servers don't like being sent the range header */
516 av_dict_set(&opts, "seekable", "0", 0);
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);
523 ret = avio_open2(&in, url, AVIO_FLAG_READ,
524 c->interrupt_callback, &opts);
530 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
533 read_chomp_line(in, line, sizeof(line));
534 if (strcmp(line, "#EXTM3U")) {
535 ret = AVERROR_INVALIDDATA;
540 free_segment_list(pls);
542 pls->type = PLS_TYPE_UNSPECIFIED;
544 while (!avio_feof(in)) {
545 read_chomp_line(in, line, sizeof(line));
546 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
548 memset(&variant_info, 0, sizeof(variant_info));
549 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
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,
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);
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,
568 new_rendition(c, &info, url);
569 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
570 ret = ensure_playlist(c, &pls, url);
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);
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);
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)) {
590 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
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, '@');
597 seg_offset = atoi(ptr+1);
598 } else if (av_strstart(line, "#", NULL)) {
600 } else if (line[0]) {
602 if (!new_variant(c, &variant_info, line, url)) {
603 ret = AVERROR(ENOMEM);
611 if (!new_variant(c, 0, url, NULL)) {
612 ret = AVERROR(ENOMEM);
615 pls = c->playlists[c->n_playlists - 1];
617 seg = av_malloc(sizeof(struct segment));
619 ret = AVERROR(ENOMEM);
622 seg->duration = duration;
623 seg->key_type = key_type;
625 memcpy(seg->iv, iv, sizeof(iv));
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);
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);
637 ret = AVERROR(ENOMEM);
644 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
645 seg->url = av_strdup(tmp_str);
649 ret = AVERROR(ENOMEM);
653 dynarray_add(&pls->segments, &pls->n_segments, seg);
656 seg->size = seg_size;
658 seg->url_offset = seg_offset;
659 seg_offset += seg_size;
669 pls->last_load_time = av_gettime();
678 enum ReadFromURLMode {
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)
688 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
690 /* limit read if the segment was only a part of a file */
692 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
694 if (mode == READ_COMPLETE)
695 ret = ffurl_read_complete(pls->input, buf, buf_size);
697 ret = ffurl_read(pls->input, buf, buf_size);
700 pls->cur_seg_offset += ret;
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)
710 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
711 ID3v2ExtraMeta *meta;
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)
724 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
726 } else if (!strcmp(meta->tag, "APIC") && apic)
731 /* Check if the ID3 metadata contents have changed */
732 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
733 ID3v2ExtraMetaAPIC *apic)
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)
744 /* check if apic appeared */
745 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
749 int size = pls->ctx->streams[1]->attached_pic.size;
750 if (size != apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE)
753 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
760 /* Parse ID3 data and handle the found data */
761 static void handle_id3(AVIOContext *pb, struct playlist *pls)
763 AVDictionary *metadata = NULL;
764 ID3v2ExtraMetaAPIC *apic = NULL;
765 ID3v2ExtraMeta *extra_meta = NULL;
766 int64_t timestamp = AV_NOPTS_VALUE;
768 parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta);
770 if (timestamp != AV_NOPTS_VALUE) {
771 pls->id3_mpegts_timestamp = timestamp;
775 if (!pls->id3_found) {
776 /* initial ID3 tags */
777 av_assert0(!pls->id3_deferred_extra);
780 /* get picture attachment and set text metadata */
781 if (pls->ctx->nb_streams)
782 ff_id3v2_parse_apic(pls->ctx, &extra_meta);
784 /* demuxer not yet opened, defer picture attachment */
785 pls->id3_deferred_extra = extra_meta;
787 av_dict_copy(&pls->ctx->metadata, metadata, 0);
788 pls->id3_initial = metadata;
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;
795 av_dict_free(&metadata);
798 if (!pls->id3_deferred_extra)
799 ff_id3v2_free_extra_meta(&extra_meta);
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)
806 /* intercept id3 tags, we do not want to pass them to the raw
807 * demuxer on all segment switches */
812 /* gather all the id3 tags */
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);
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 */
826 } else if (*len <= 0) {
833 if (*len < ID3v2_HEADER_SIZE)
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;
843 if (taglen > maxsize) {
844 av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
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.
856 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
859 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
860 id3_buf_pos += tag_got_bytes;
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);
868 /* read the rest of the tag in */
869 if (read_from_url(pls, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
871 id3_buf_pos += remaining;
872 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
876 /* no more ID3 tags */
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);
885 /* ignore error if we already had some data */
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);
899 if (pls->is_id3_timestamped == -1)
900 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
903 static int open_input(HLSContext *c, struct playlist *pls)
905 AVDictionary *opts = NULL;
906 AVDictionary *opts2 = NULL;
908 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
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);
916 // Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice)
917 av_dict_copy(&opts2, opts, 0);
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);
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);
929 if (seg->key_type == KEY_NONE) {
930 ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ,
931 &pls->parent->interrupt_callback, &opts);
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)) {
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",
946 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
949 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
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);
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)
961 av_opt_set(pls->input->priv_data, "key", key, 0);
962 av_opt_set(pls->input->priv_data, "iv", iv, 0);
964 if ((ret = ffurl_connect(pls->input, &opts)) < 0) {
965 ffurl_close(pls->input);
972 ret = AVERROR(ENOSYS);
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);
980 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
982 ffurl_close(pls->input);
989 av_dict_free(&opts2);
990 pls->cur_seg_offset = 0;
994 static int64_t default_reload_interval(struct playlist *pls)
996 return pls->n_segments > 0 ?
997 pls->segments[pls->n_segments - 1]->duration :
998 pls->target_duration;
1001 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1003 struct playlist *v = opaque;
1004 HLSContext *c = v->parent->priv_data;
1006 int just_opened = 0;
1013 int64_t reload_interval;
1015 /* Check that the playlist is still needed before opening a new
1017 if (v->ctx && v->ctx->nb_streams &&
1018 v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
1020 for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
1022 if (v->parent->streams[i]->discard < AVDISCARD_ALL)
1027 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
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);
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",
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;
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;
1055 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
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);
1063 /* Enough time has elapsed since the last reload */
1067 ret = open_input(c, v);
1069 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
1076 ret = read_from_url(v, buf, buf_size, READ_NORMAL);
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);
1086 ffurl_close(v->input);
1090 c->cur_seq_no = v->cur_seq_no;
1095 static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls)
1097 int variant_count = 0;
1100 for (i = 0; i < c->n_variants && variant_count < 2; i++) {
1101 struct variant *v = c->variants[i];
1103 for (j = 0; j < v->n_playlists; j++) {
1104 if (v->playlists[j] == pls) {
1111 return variant_count >= 2;
1114 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1115 enum AVMediaType type, const char *group_id)
1119 for (i = 0; i < c->n_renditions; i++) {
1120 struct rendition *rend = c->renditions[i];
1122 if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1125 /* rendition is an external playlist
1126 * => add the playlist to the variant */
1127 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
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,
1138 static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1139 enum AVMediaType type)
1144 for (i = 0; i < pls->ctx->nb_streams; i++) {
1145 AVStream *st = s->streams[pls->stream_offset + i];
1147 if (st->codec->codec_type != type)
1150 for (; rend_idx < pls->n_renditions; rend_idx++) {
1151 struct rendition *rend = pls->renditions[rend_idx];
1153 if (rend->type != type)
1156 if (rend->language[0])
1157 av_dict_set(&st->metadata, "language", rend->language, 0);
1159 av_dict_set(&st->metadata, "comment", rend->name, 0);
1161 st->disposition |= rend->disposition;
1163 if (rend_idx >=pls->n_renditions)
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)
1174 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1175 0 : c->first_timestamp;
1177 if (timestamp < pos) {
1178 *seq_no = pls->start_seq_no;
1182 for (i = 0; i < pls->n_segments; i++) {
1183 int64_t diff = pos + pls->segments[i]->duration - timestamp;
1185 *seq_no = pls->start_seq_no + i;
1188 pos += pls->segments[i]->duration;
1191 *seq_no = pls->start_seq_no + pls->n_segments - 1;
1196 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
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);
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);
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;
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;
1229 /* Otherwise just start on the first segment. */
1230 return pls->start_seq_no;
1233 static int hls_read_header(AVFormatContext *s)
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;
1239 c->interrupt_callback = &s->interrupt_callback;
1241 c->first_packet = 1;
1242 c->first_timestamp = AV_NOPTS_VALUE;
1243 c->cur_timestamp = AV_NOPTS_VALUE;
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);
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);
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);
1266 if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
1269 if (c->n_variants == 0) {
1270 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
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)
1284 if (c->variants[0]->playlists[0]->n_segments == 0) {
1285 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1290 /* If this isn't a live stream, calculate the total duration of the
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;
1299 /* Associate renditions with variants */
1300 for (i = 0; i < c->n_variants; i++) {
1301 struct variant *var = c->variants[i];
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);
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;
1316 if (pls->n_segments == 0)
1319 if (!(pls->ctx = avformat_alloc_context())) {
1320 ret = AVERROR(ENOMEM);
1327 pls->cur_seq_no = select_cur_seq_no(c, pls);
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,
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);
1345 pls->ctx->pb = &pls->pb;
1346 pls->stream_offset = stream_offset;
1348 av_assert0(!pls->ctx->codec_whitelist && !pls->ctx->format_whitelist);
1349 pls->ctx-> codec_whitelist = av_strdup(s->codec_whitelist);
1350 pls->ctx->format_whitelist = av_strdup(s->format_whitelist);
1352 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1356 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1357 ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
1358 avformat_queue_attached_pictures(pls->ctx);
1359 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
1360 pls->id3_deferred_extra = NULL;
1363 pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
1364 ret = avformat_find_stream_info(pls->ctx, NULL);
1368 if (pls->is_id3_timestamped == -1)
1369 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1371 /* Create new AVStreams for each stream in this playlist */
1372 for (j = 0; j < pls->ctx->nb_streams; j++) {
1373 AVStream *st = avformat_new_stream(s, NULL);
1374 AVStream *ist = pls->ctx->streams[j];
1376 ret = AVERROR(ENOMEM);
1381 avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
1383 if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1384 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1386 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1389 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
1390 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
1391 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
1393 stream_offset += pls->ctx->nb_streams;
1396 /* Create a program for each variant */
1397 for (i = 0; i < c->n_variants; i++) {
1398 struct variant *v = c->variants[i];
1401 program = av_new_program(s, i);
1404 av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1406 for (j = 0; j < v->n_playlists; j++) {
1407 struct playlist *pls = v->playlists[j];
1408 int is_shared = playlist_in_multiple_variants(c, pls);
1411 for (k = 0; k < pls->ctx->nb_streams; k++) {
1412 struct AVStream *st = s->streams[pls->stream_offset + k];
1414 ff_program_add_stream_index(s, i, pls->stream_offset + k);
1416 /* Set variant_bitrate for streams unique to this variant */
1417 if (!is_shared && v->bandwidth)
1418 av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0);
1425 free_playlist_list(c);
1426 free_variant_list(c);
1427 free_rendition_list(c);
1431 static int recheck_discard_flags(AVFormatContext *s, int first)
1433 HLSContext *c = s->priv_data;
1436 /* Check if any new streams are needed */
1437 for (i = 0; i < c->n_playlists; i++)
1438 c->playlists[i]->cur_needed = 0;
1440 for (i = 0; i < s->nb_streams; i++) {
1441 AVStream *st = s->streams[i];
1442 struct playlist *pls = c->playlists[s->streams[i]->id];
1443 if (st->discard < AVDISCARD_ALL)
1444 pls->cur_needed = 1;
1446 for (i = 0; i < c->n_playlists; i++) {
1447 struct playlist *pls = c->playlists[i];
1448 if (pls->cur_needed && !pls->needed) {
1451 pls->cur_seq_no = select_cur_seq_no(c, pls);
1452 pls->pb.eof_reached = 0;
1453 if (c->cur_timestamp != AV_NOPTS_VALUE) {
1455 pls->seek_timestamp = c->cur_timestamp;
1456 pls->seek_flags = AVSEEK_FLAG_ANY;
1457 pls->seek_stream_index = -1;
1459 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
1460 } else if (first && !pls->cur_needed && pls->needed) {
1462 ffurl_close(pls->input);
1466 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
1472 static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
1474 if (pls->id3_offset >= 0) {
1475 pls->pkt.dts = pls->id3_mpegts_timestamp +
1476 av_rescale_q(pls->id3_offset,
1477 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1479 if (pls->pkt.duration)
1480 pls->id3_offset += pls->pkt.duration;
1482 pls->id3_offset = -1;
1484 /* there have been packets with unknown duration
1485 * since the last id3 tag, should not normally happen */
1486 pls->pkt.dts = AV_NOPTS_VALUE;
1489 if (pls->pkt.duration)
1490 pls->pkt.duration = av_rescale_q(pls->pkt.duration,
1491 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1494 pls->pkt.pts = AV_NOPTS_VALUE;
1497 static AVRational get_timebase(struct playlist *pls)
1499 if (pls->is_id3_timestamped)
1500 return MPEG_TIME_BASE_Q;
1502 return pls->ctx->streams[pls->pkt.stream_index]->time_base;
1505 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
1506 int64_t ts_b, struct playlist *pls_b)
1508 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
1509 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
1511 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
1514 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
1516 HLSContext *c = s->priv_data;
1517 int ret, i, minplaylist = -1;
1519 recheck_discard_flags(s, c->first_packet);
1521 for (i = 0; i < c->n_playlists; i++) {
1522 struct playlist *pls = c->playlists[i];
1523 /* Make sure we've got one buffered packet from each open playlist
1525 if (pls->needed && !pls->pkt.data) {
1529 ret = av_read_frame(pls->ctx, &pls->pkt);
1531 if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
1533 reset_packet(&pls->pkt);
1536 /* stream_index check prevents matching picture attachments etc. */
1537 if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
1538 /* audio elementary streams are id3 timestamped */
1539 fill_timing_for_id3_timestamped_stream(pls);
1542 if (c->first_timestamp == AV_NOPTS_VALUE &&
1543 pls->pkt.dts != AV_NOPTS_VALUE)
1544 c->first_timestamp = av_rescale_q(pls->pkt.dts,
1545 get_timebase(pls), AV_TIME_BASE_Q);
1548 if (pls->seek_timestamp == AV_NOPTS_VALUE)
1551 if (pls->seek_stream_index < 0 ||
1552 pls->seek_stream_index == pls->pkt.stream_index) {
1554 if (pls->pkt.dts == AV_NOPTS_VALUE) {
1555 pls->seek_timestamp = AV_NOPTS_VALUE;
1559 tb = get_timebase(pls);
1560 ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
1561 tb.den, AV_ROUND_DOWN) -
1562 pls->seek_timestamp;
1563 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
1564 pls->pkt.flags & AV_PKT_FLAG_KEY)) {
1565 pls->seek_timestamp = AV_NOPTS_VALUE;
1569 av_free_packet(&pls->pkt);
1570 reset_packet(&pls->pkt);
1573 /* Check if this stream has the packet with the lowest dts */
1574 if (pls->pkt.data) {
1575 struct playlist *minpls = minplaylist < 0 ?
1576 NULL : c->playlists[minplaylist];
1577 if (minplaylist < 0) {
1580 int64_t dts = pls->pkt.dts;
1581 int64_t mindts = minpls->pkt.dts;
1583 if (dts == AV_NOPTS_VALUE ||
1584 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
1590 /* If we got a packet, return it */
1591 if (minplaylist >= 0) {
1592 struct playlist *pls = c->playlists[minplaylist];
1594 pkt->stream_index += pls->stream_offset;
1595 reset_packet(&c->playlists[minplaylist]->pkt);
1597 if (pkt->dts != AV_NOPTS_VALUE)
1598 c->cur_timestamp = av_rescale_q(pkt->dts,
1599 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1607 static int hls_close(AVFormatContext *s)
1609 HLSContext *c = s->priv_data;
1611 free_playlist_list(c);
1612 free_variant_list(c);
1613 free_rendition_list(c);
1617 static int hls_read_seek(AVFormatContext *s, int stream_index,
1618 int64_t timestamp, int flags)
1620 HLSContext *c = s->priv_data;
1621 struct playlist *seek_pls = NULL;
1623 int64_t first_timestamp, seek_timestamp, duration;
1625 if ((flags & AVSEEK_FLAG_BYTE) ||
1626 !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
1627 return AVERROR(ENOSYS);
1629 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
1630 0 : c->first_timestamp;
1632 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
1633 s->streams[stream_index]->time_base.den,
1634 flags & AVSEEK_FLAG_BACKWARD ?
1635 AV_ROUND_DOWN : AV_ROUND_UP);
1637 duration = s->duration == AV_NOPTS_VALUE ?
1640 if (0 < duration && duration < seek_timestamp - first_timestamp)
1641 return AVERROR(EIO);
1643 /* find the playlist with the specified stream */
1644 for (i = 0; i < c->n_playlists; i++) {
1645 struct playlist *pls = c->playlists[i];
1646 if (stream_index >= pls->stream_offset &&
1647 stream_index - pls->stream_offset < pls->ctx->nb_streams) {
1652 /* check if the timestamp is valid for the playlist with the
1653 * specified stream index */
1654 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
1655 return AVERROR(EIO);
1657 /* set segment now so we do not need to search again below */
1658 seek_pls->cur_seq_no = seq_no;
1659 seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset;
1661 for (i = 0; i < c->n_playlists; i++) {
1663 struct playlist *pls = c->playlists[i];
1665 ffurl_close(pls->input);
1668 av_free_packet(&pls->pkt);
1669 reset_packet(&pls->pkt);
1670 pls->pb.eof_reached = 0;
1671 /* Clear any buffered data */
1672 pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
1673 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
1675 /* Flush the packet queue of the subdemuxer. */
1676 ff_read_frame_flush(pls->ctx);
1678 pls->seek_timestamp = seek_timestamp;
1679 pls->seek_flags = flags;
1681 if (pls != seek_pls) {
1682 /* set closest segment seq_no for playlists not handled above */
1683 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
1684 /* seek the playlist to the given position without taking
1685 * keyframes into account since this playlist does not have the
1686 * specified stream where we should look for the keyframes */
1687 pls->seek_stream_index = -1;
1688 pls->seek_flags |= AVSEEK_FLAG_ANY;
1692 c->cur_timestamp = seek_timestamp;
1697 static int hls_probe(AVProbeData *p)
1699 /* Require #EXTM3U at the start, and either one of the ones below
1700 * somewhere for a proper match. */
1701 if (strncmp(p->buf, "#EXTM3U", 7))
1703 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
1704 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
1705 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
1706 return AVPROBE_SCORE_MAX;
1710 AVInputFormat ff_hls_demuxer = {
1711 .name = "hls,applehttp",
1712 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
1713 .priv_data_size = sizeof(HLSContext),
1714 .read_probe = hls_probe,
1715 .read_header = hls_read_header,
1716 .read_packet = hls_read_packet,
1717 .read_close = hls_close,
1718 .read_seek = hls_read_seek,