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.
71 char url[MAX_URL_SIZE];
72 char key[MAX_URL_SIZE];
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_free(pls->segments[i]);
197 av_freep(&pls->segments);
201 static void free_playlist_list(HLSContext *c)
204 for (i = 0; i < c->n_playlists; i++) {
205 struct playlist *pls = c->playlists[i];
206 free_segment_list(pls);
207 av_freep(&pls->renditions);
208 av_freep(&pls->id3_buf);
209 av_dict_free(&pls->id3_initial);
210 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
211 av_free_packet(&pls->pkt);
212 av_free(pls->pb.buffer);
214 ffurl_close(pls->input);
217 avformat_close_input(&pls->ctx);
221 av_freep(&c->playlists);
222 av_freep(&c->cookies);
223 av_freep(&c->user_agent);
227 static void free_variant_list(HLSContext *c)
230 for (i = 0; i < c->n_variants; i++) {
231 struct variant *var = c->variants[i];
232 av_freep(&var->playlists);
235 av_freep(&c->variants);
239 static void free_rendition_list(HLSContext *c)
242 for (i = 0; i < c->n_renditions; i++)
243 av_free(c->renditions[i]);
244 av_freep(&c->renditions);
249 * Used to reset a statically allocated AVPacket to a clean slate,
250 * containing no data.
252 static void reset_packet(AVPacket *pkt)
258 static struct playlist *new_playlist(HLSContext *c, const char *url,
261 struct playlist *pls = av_mallocz(sizeof(struct playlist));
264 reset_packet(&pls->pkt);
265 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
266 pls->seek_timestamp = AV_NOPTS_VALUE;
268 pls->is_id3_timestamped = -1;
269 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
271 dynarray_add(&c->playlists, &c->n_playlists, pls);
275 struct variant_info {
277 /* variant group ids: */
278 char audio[MAX_FIELD_LEN];
279 char video[MAX_FIELD_LEN];
280 char subtitles[MAX_FIELD_LEN];
283 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
284 const char *url, const char *base)
287 struct playlist *pls;
289 pls = new_playlist(c, url, base);
293 var = av_mallocz(sizeof(struct variant));
298 var->bandwidth = atoi(info->bandwidth);
299 strcpy(var->audio_group, info->audio);
300 strcpy(var->video_group, info->video);
301 strcpy(var->subtitles_group, info->subtitles);
304 dynarray_add(&c->variants, &c->n_variants, var);
305 dynarray_add(&var->playlists, &var->n_playlists, pls);
309 static void handle_variant_args(struct variant_info *info, const char *key,
310 int key_len, char **dest, int *dest_len)
312 if (!strncmp(key, "BANDWIDTH=", key_len)) {
313 *dest = info->bandwidth;
314 *dest_len = sizeof(info->bandwidth);
315 } else if (!strncmp(key, "AUDIO=", key_len)) {
317 *dest_len = sizeof(info->audio);
318 } else if (!strncmp(key, "VIDEO=", key_len)) {
320 *dest_len = sizeof(info->video);
321 } else if (!strncmp(key, "SUBTITLES=", key_len)) {
322 *dest = info->subtitles;
323 *dest_len = sizeof(info->subtitles);
328 char uri[MAX_URL_SIZE];
333 static void handle_key_args(struct key_info *info, const char *key,
334 int key_len, char **dest, int *dest_len)
336 if (!strncmp(key, "METHOD=", key_len)) {
337 *dest = info->method;
338 *dest_len = sizeof(info->method);
339 } else if (!strncmp(key, "URI=", key_len)) {
341 *dest_len = sizeof(info->uri);
342 } else if (!strncmp(key, "IV=", key_len)) {
344 *dest_len = sizeof(info->iv);
348 struct rendition_info {
350 char uri[MAX_URL_SIZE];
351 char group_id[MAX_FIELD_LEN];
352 char language[MAX_FIELD_LEN];
353 char assoc_language[MAX_FIELD_LEN];
354 char name[MAX_FIELD_LEN];
357 char characteristics[MAX_CHARACTERISTICS_LEN];
360 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
361 const char *url_base)
363 struct rendition *rend;
364 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
365 char *characteristic;
369 if (!strcmp(info->type, "AUDIO"))
370 type = AVMEDIA_TYPE_AUDIO;
371 else if (!strcmp(info->type, "VIDEO"))
372 type = AVMEDIA_TYPE_VIDEO;
373 else if (!strcmp(info->type, "SUBTITLES"))
374 type = AVMEDIA_TYPE_SUBTITLE;
375 else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
376 /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
377 * AVC SEI RBSP anyway */
380 if (type == AVMEDIA_TYPE_UNKNOWN)
383 /* URI is mandatory for subtitles as per spec */
384 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
387 /* TODO: handle subtitles (each segment has to parsed separately) */
388 if (type == AVMEDIA_TYPE_SUBTITLE)
391 rend = av_mallocz(sizeof(struct rendition));
395 dynarray_add(&c->renditions, &c->n_renditions, rend);
398 strcpy(rend->group_id, info->group_id);
399 strcpy(rend->language, info->language);
400 strcpy(rend->name, info->name);
402 /* add the playlist if this is an external rendition */
404 rend->playlist = new_playlist(c, info->uri, url_base);
406 dynarray_add(&rend->playlist->renditions,
407 &rend->playlist->n_renditions, rend);
410 if (info->assoc_language[0]) {
411 int langlen = strlen(rend->language);
412 if (langlen < sizeof(rend->language) - 3) {
413 rend->language[langlen] = ',';
414 strncpy(rend->language + langlen + 1, info->assoc_language,
415 sizeof(rend->language) - langlen - 2);
419 if (!strcmp(info->defaultr, "YES"))
420 rend->disposition |= AV_DISPOSITION_DEFAULT;
421 if (!strcmp(info->forced, "YES"))
422 rend->disposition |= AV_DISPOSITION_FORCED;
424 chr_ptr = info->characteristics;
425 while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
426 if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
427 rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
428 else if (!strcmp(characteristic, "public.accessibility.describes-video"))
429 rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
437 static void handle_rendition_args(struct rendition_info *info, const char *key,
438 int key_len, char **dest, int *dest_len)
440 if (!strncmp(key, "TYPE=", key_len)) {
442 *dest_len = sizeof(info->type);
443 } else if (!strncmp(key, "URI=", key_len)) {
445 *dest_len = sizeof(info->uri);
446 } else if (!strncmp(key, "GROUP-ID=", key_len)) {
447 *dest = info->group_id;
448 *dest_len = sizeof(info->group_id);
449 } else if (!strncmp(key, "LANGUAGE=", key_len)) {
450 *dest = info->language;
451 *dest_len = sizeof(info->language);
452 } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
453 *dest = info->assoc_language;
454 *dest_len = sizeof(info->assoc_language);
455 } else if (!strncmp(key, "NAME=", key_len)) {
457 *dest_len = sizeof(info->name);
458 } else if (!strncmp(key, "DEFAULT=", key_len)) {
459 *dest = info->defaultr;
460 *dest_len = sizeof(info->defaultr);
461 } else if (!strncmp(key, "FORCED=", key_len)) {
462 *dest = info->forced;
463 *dest_len = sizeof(info->forced);
464 } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
465 *dest = info->characteristics;
466 *dest_len = sizeof(info->characteristics);
470 * - AUTOSELECT: client may autoselect based on e.g. system language
471 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
475 /* used by parse_playlist to allocate a new variant+playlist when the
476 * playlist is detected to be a Media Playlist (not Master Playlist)
477 * and we have no parent Master Playlist (parsing of which would have
478 * allocated the variant and playlist already) */
479 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
483 if (!new_variant(c, NULL, url, NULL))
484 return AVERROR(ENOMEM);
485 *pls = c->playlists[c->n_playlists - 1];
489 /* pls = NULL => Master Playlist or parentless Media Playlist
490 * pls = !NULL => parented Media Playlist, playlist+variant allocated */
491 static int parse_playlist(HLSContext *c, const char *url,
492 struct playlist *pls, AVIOContext *in)
494 int ret = 0, is_segment = 0, is_variant = 0;
495 int64_t duration = 0;
496 enum KeyType key_type = KEY_NONE;
499 char key[MAX_URL_SIZE] = "";
500 char line[MAX_URL_SIZE];
503 int64_t seg_offset = 0;
504 int64_t seg_size = -1;
505 uint8_t *new_url = NULL;
506 struct variant_info variant_info;
509 AVDictionary *opts = NULL;
511 /* Some HLS servers don't like being sent the range header */
512 av_dict_set(&opts, "seekable", "0", 0);
514 // broker prior HTTP options that should be consistent across requests
515 av_dict_set(&opts, "user-agent", c->user_agent, 0);
516 av_dict_set(&opts, "cookies", c->cookies, 0);
517 av_dict_set(&opts, "headers", c->headers, 0);
519 ret = avio_open2(&in, url, AVIO_FLAG_READ,
520 c->interrupt_callback, &opts);
526 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
529 read_chomp_line(in, line, sizeof(line));
530 if (strcmp(line, "#EXTM3U")) {
531 ret = AVERROR_INVALIDDATA;
536 free_segment_list(pls);
538 pls->type = PLS_TYPE_UNSPECIFIED;
540 while (!url_feof(in)) {
541 read_chomp_line(in, line, sizeof(line));
542 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
544 memset(&variant_info, 0, sizeof(variant_info));
545 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
547 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
548 struct key_info info = {{0}};
549 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
553 if (!strcmp(info.method, "AES-128"))
554 key_type = KEY_AES_128;
555 if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
556 ff_hex_to_data(iv, info.iv + 2);
559 av_strlcpy(key, info.uri, sizeof(key));
560 } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
561 struct rendition_info info = {{0}};
562 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
564 new_rendition(c, &info, url);
565 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
566 ret = ensure_playlist(c, &pls, url);
569 pls->target_duration = atoi(ptr) * AV_TIME_BASE;
570 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
571 ret = ensure_playlist(c, &pls, url);
574 pls->start_seq_no = atoi(ptr);
575 } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
576 ret = ensure_playlist(c, &pls, url);
579 if (!strcmp(ptr, "EVENT"))
580 pls->type = PLS_TYPE_EVENT;
581 else if (!strcmp(ptr, "VOD"))
582 pls->type = PLS_TYPE_VOD;
583 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
586 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
588 duration = atof(ptr) * AV_TIME_BASE;
589 } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
590 seg_size = atoi(ptr);
591 ptr = strchr(ptr, '@');
593 seg_offset = atoi(ptr+1);
594 } else if (av_strstart(line, "#", NULL)) {
596 } else if (line[0]) {
598 if (!new_variant(c, &variant_info, line, url)) {
599 ret = AVERROR(ENOMEM);
607 if (!new_variant(c, 0, url, NULL)) {
608 ret = AVERROR(ENOMEM);
611 pls = c->playlists[c->n_playlists - 1];
613 seg = av_malloc(sizeof(struct segment));
615 ret = AVERROR(ENOMEM);
618 seg->duration = duration;
619 seg->key_type = key_type;
621 memcpy(seg->iv, iv, sizeof(iv));
623 int seq = pls->start_seq_no + pls->n_segments;
624 memset(seg->iv, 0, sizeof(seg->iv));
625 AV_WB32(seg->iv + 12, seq);
627 ff_make_absolute_url(seg->key, sizeof(seg->key), url, key);
628 ff_make_absolute_url(seg->url, sizeof(seg->url), url, line);
629 dynarray_add(&pls->segments, &pls->n_segments, seg);
632 seg->size = seg_size;
634 seg->url_offset = seg_offset;
635 seg_offset += seg_size;
645 pls->last_load_time = av_gettime();
654 enum ReadFromURLMode {
659 /* read from URLContext, limiting read to current segment */
660 static int read_from_url(struct playlist *pls, uint8_t *buf, int buf_size,
661 enum ReadFromURLMode mode)
664 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
666 /* limit read if the segment was only a part of a file */
668 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
670 if (mode == READ_COMPLETE)
671 ret = ffurl_read_complete(pls->input, buf, buf_size);
673 ret = ffurl_read(pls->input, buf, buf_size);
676 pls->cur_seg_offset += ret;
681 /* Parse the raw ID3 data and pass contents to caller */
682 static void parse_id3(AVFormatContext *s, AVIOContext *pb,
683 AVDictionary **metadata, int64_t *dts,
684 ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
686 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
687 ID3v2ExtraMeta *meta;
689 ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
690 for (meta = *extra_meta; meta; meta = meta->next) {
691 if (!strcmp(meta->tag, "PRIV")) {
692 ID3v2ExtraMetaPRIV *priv = meta->data;
693 if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
694 /* 33-bit MPEG timestamp */
695 int64_t ts = AV_RB64(priv->data);
696 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
697 if ((ts & ~((1ULL << 33) - 1)) == 0)
700 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
702 } else if (!strcmp(meta->tag, "APIC") && apic)
707 /* Check if the ID3 metadata contents have changed */
708 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
709 ID3v2ExtraMetaAPIC *apic)
711 AVDictionaryEntry *entry = NULL;
712 AVDictionaryEntry *oldentry;
713 /* check that no keys have changed values */
714 while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
715 oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
716 if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
720 /* check if apic appeared */
721 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
725 int size = pls->ctx->streams[1]->attached_pic.size;
726 if (size != apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE)
729 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
736 /* Parse ID3 data and handle the found data */
737 static void handle_id3(AVIOContext *pb, struct playlist *pls)
739 AVDictionary *metadata = NULL;
740 ID3v2ExtraMetaAPIC *apic = NULL;
741 ID3v2ExtraMeta *extra_meta = NULL;
742 int64_t timestamp = AV_NOPTS_VALUE;
744 parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta);
746 if (timestamp != AV_NOPTS_VALUE) {
747 pls->id3_mpegts_timestamp = timestamp;
751 if (!pls->id3_found) {
752 /* initial ID3 tags */
753 av_assert0(!pls->id3_deferred_extra);
756 /* get picture attachment and set text metadata */
757 if (pls->ctx->nb_streams)
758 ff_id3v2_parse_apic(pls->ctx, &extra_meta);
760 /* demuxer not yet opened, defer picture attachment */
761 pls->id3_deferred_extra = extra_meta;
763 av_dict_copy(&pls->ctx->metadata, metadata, 0);
764 pls->id3_initial = metadata;
767 if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
768 avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
769 pls->id3_changed = 1;
771 av_dict_free(&metadata);
774 if (!pls->id3_deferred_extra)
775 ff_id3v2_free_extra_meta(&extra_meta);
778 /* Intercept and handle ID3 tags between URLContext and AVIOContext */
779 static void intercept_id3(struct playlist *pls, uint8_t *buf,
780 int buf_size, int *len)
782 /* intercept id3 tags, we do not want to pass them to the raw
783 * demuxer on all segment switches */
788 /* gather all the id3 tags */
790 /* see if we can retrieve enough data for ID3 header */
791 if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
792 bytes = read_from_url(pls, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE);
795 if (bytes == ID3v2_HEADER_SIZE - *len)
796 /* no EOF yet, so fill the caller buffer again after
797 * we have stripped the ID3 tags */
802 } else if (*len <= 0) {
809 if (*len < ID3v2_HEADER_SIZE)
812 if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
813 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
814 int64_t segsize = seg->size >= 0 ? seg->size : ffurl_size(pls->input);
815 int taglen = ff_id3v2_tag_len(buf);
816 int tag_got_bytes = FFMIN(taglen, *len);
817 int remaining = taglen - tag_got_bytes;
819 if (taglen > segsize) {
820 av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d vs %"PRId64")\n",
826 * Copy the id3 tag to our temporary id3 buffer.
827 * We could read a small id3 tag directly without memcpy, but
828 * we would still need to copy the large tags, and handling
829 * both of those cases together with the possibility for multiple
830 * tags would make the handling a bit complex.
832 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
835 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
836 id3_buf_pos += tag_got_bytes;
838 /* strip the intercepted bytes */
839 *len -= tag_got_bytes;
840 memmove(buf, buf + tag_got_bytes, *len);
841 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
844 /* read the rest of the tag in */
845 if (read_from_url(pls, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
847 id3_buf_pos += remaining;
848 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
852 /* no more ID3 tags */
857 /* re-fill buffer for the caller unless EOF */
858 if (*len >= 0 && (fill_buf || *len == 0)) {
859 bytes = read_from_url(pls, buf + *len, buf_size - *len, READ_NORMAL);
861 /* ignore error if we already had some data */
869 /* Now parse all the ID3 tags */
870 AVIOContext id3ioctx;
871 ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
872 handle_id3(&id3ioctx, pls);
875 if (pls->is_id3_timestamped == -1)
876 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
879 static int open_input(HLSContext *c, struct playlist *pls)
881 AVDictionary *opts = NULL;
882 AVDictionary *opts2 = NULL;
884 struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
886 // broker prior HTTP options that should be consistent across requests
887 av_dict_set(&opts, "user-agent", c->user_agent, 0);
888 av_dict_set(&opts, "cookies", c->cookies, 0);
889 av_dict_set(&opts, "headers", c->headers, 0);
890 av_dict_set(&opts, "seekable", "0", 0);
892 // Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice)
893 av_dict_copy(&opts2, opts, 0);
895 if (seg->size >= 0) {
896 /* try to restrict the HTTP request to the part we want
897 * (if this is in fact a HTTP request) */
898 char offset[24] = { 0 };
899 char end_offset[24] = { 0 };
900 snprintf(offset, sizeof(offset) - 1, "%"PRId64,
902 snprintf(end_offset, sizeof(end_offset) - 1, "%"PRId64,
903 seg->url_offset + seg->size);
904 av_dict_set(&opts, "offset", offset, 0);
905 av_dict_set(&opts, "end_offset", end_offset, 0);
908 av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
909 seg->url, seg->url_offset, pls->index);
911 if (seg->key_type == KEY_NONE) {
912 ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ,
913 &pls->parent->interrupt_callback, &opts);
915 } else if (seg->key_type == KEY_AES_128) {
916 char iv[33], key[33], url[MAX_URL_SIZE];
917 if (strcmp(seg->key, pls->key_url)) {
919 if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
920 &pls->parent->interrupt_callback, &opts2) == 0) {
921 if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
922 != sizeof(pls->key)) {
923 av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
928 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
931 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
933 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
934 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
935 iv[32] = key[32] = '\0';
936 if (strstr(seg->url, "://"))
937 snprintf(url, sizeof(url), "crypto+%s", seg->url);
939 snprintf(url, sizeof(url), "crypto:%s", seg->url);
940 if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ,
941 &pls->parent->interrupt_callback)) < 0)
943 av_opt_set(pls->input->priv_data, "key", key, 0);
944 av_opt_set(pls->input->priv_data, "iv", iv, 0);
946 if ((ret = ffurl_connect(pls->input, &opts)) < 0) {
947 ffurl_close(pls->input);
954 ret = AVERROR(ENOSYS);
956 /* Seek to the requested position. If this was a HTTP request, the offset
957 * should already be where want it to, but this allows e.g. local testing
958 * without a HTTP server. */
960 int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET);
962 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
964 ffurl_close(pls->input);
971 av_dict_free(&opts2);
972 pls->cur_seg_offset = 0;
976 static int64_t default_reload_interval(struct playlist *pls)
978 return pls->n_segments > 0 ?
979 pls->segments[pls->n_segments - 1]->duration :
980 pls->target_duration;
983 static int read_data(void *opaque, uint8_t *buf, int buf_size)
985 struct playlist *v = opaque;
986 HLSContext *c = v->parent->priv_data;
995 int64_t reload_interval;
997 /* Check that the playlist is still needed before opening a new
999 if (v->ctx && v->ctx->nb_streams &&
1000 v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
1002 for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
1004 if (v->parent->streams[i]->discard < AVDISCARD_ALL)
1009 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
1014 /* If this is a live stream and the reload interval has elapsed since
1015 * the last playlist reload, reload the playlists now. */
1016 reload_interval = default_reload_interval(v);
1020 av_gettime() - v->last_load_time >= reload_interval) {
1021 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1022 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1026 /* If we need to reload the playlist again below (if
1027 * there's still no more segments), switch to a reload
1028 * interval of half the target duration. */
1029 reload_interval = v->target_duration / 2;
1031 if (v->cur_seq_no < v->start_seq_no) {
1032 av_log(NULL, AV_LOG_WARNING,
1033 "skipping %d segments ahead, expired from playlists\n",
1034 v->start_seq_no - v->cur_seq_no);
1035 v->cur_seq_no = v->start_seq_no;
1037 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1040 while (av_gettime() - v->last_load_time < reload_interval) {
1041 if (ff_check_interrupt(c->interrupt_callback))
1042 return AVERROR_EXIT;
1043 av_usleep(100*1000);
1045 /* Enough time has elapsed since the last reload */
1049 ret = open_input(c, v);
1051 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
1058 ret = read_from_url(v, buf, buf_size, READ_NORMAL);
1060 if (just_opened && v->is_id3_timestamped != 0) {
1061 /* Intercept ID3 tags here, elementary audio streams are required
1062 * to convey timestamps using them in the beginning of each segment. */
1063 intercept_id3(v, buf, buf_size, &ret);
1068 ffurl_close(v->input);
1072 c->cur_seq_no = v->cur_seq_no;
1077 static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls)
1079 int variant_count = 0;
1082 for (i = 0; i < c->n_variants && variant_count < 2; i++) {
1083 struct variant *v = c->variants[i];
1085 for (j = 0; j < v->n_playlists; j++) {
1086 if (v->playlists[j] == pls) {
1093 return variant_count >= 2;
1096 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1097 enum AVMediaType type, const char *group_id)
1101 for (i = 0; i < c->n_renditions; i++) {
1102 struct rendition *rend = c->renditions[i];
1104 if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1107 /* rendition is an external playlist
1108 * => add the playlist to the variant */
1109 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1111 /* rendition is part of the variant main Media Playlist
1112 * => add the rendition to the main Media Playlist */
1113 dynarray_add(&var->playlists[0]->renditions,
1114 &var->playlists[0]->n_renditions,
1120 static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1121 enum AVMediaType type)
1126 for (i = 0; i < pls->ctx->nb_streams; i++) {
1127 AVStream *st = s->streams[pls->stream_offset + i];
1129 if (st->codec->codec_type != type)
1132 for (; rend_idx < pls->n_renditions; rend_idx++) {
1133 struct rendition *rend = pls->renditions[rend_idx];
1135 if (rend->type != type)
1138 if (rend->language[0])
1139 av_dict_set(&st->metadata, "language", rend->language, 0);
1141 av_dict_set(&st->metadata, "comment", rend->name, 0);
1143 st->disposition |= rend->disposition;
1145 if (rend_idx >=pls->n_renditions)
1150 /* if timestamp was in valid range: returns 1 and sets seq_no
1151 * if not: returns 0 and sets seq_no to closest segment */
1152 static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
1153 int64_t timestamp, int *seq_no)
1156 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1157 0 : c->first_timestamp;
1159 if (timestamp < pos) {
1160 *seq_no = pls->start_seq_no;
1164 for (i = 0; i < pls->n_segments; i++) {
1165 int64_t diff = pos + pls->segments[i]->duration - timestamp;
1167 *seq_no = pls->start_seq_no + i;
1170 pos += pls->segments[i]->duration;
1173 *seq_no = pls->start_seq_no + pls->n_segments - 1;
1178 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1182 if (!pls->finished && !c->first_packet &&
1183 av_gettime() - pls->last_load_time >= default_reload_interval(pls))
1184 /* reload the playlist since it was suspended */
1185 parse_playlist(c, pls->url, pls, NULL);
1187 /* If playback is already in progress (we are just selecting a new
1188 * playlist) and this is a complete file, find the matching segment
1189 * by counting durations. */
1190 if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1191 find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1195 if (!pls->finished) {
1196 if (!c->first_packet && /* we are doing a segment selection during playback */
1197 c->cur_seq_no >= pls->start_seq_no &&
1198 c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1199 /* While spec 3.4.3 says that we cannot assume anything about the
1200 * content at the same sequence number on different playlists,
1201 * in practice this seems to work and doing it otherwise would
1202 * require us to download a segment to inspect its timestamps. */
1203 return c->cur_seq_no;
1205 /* If this is a live stream with more than 3 segments, start at the
1206 * third last segment. */
1207 if (pls->n_segments > 3)
1208 return pls->start_seq_no + pls->n_segments - 3;
1211 /* Otherwise just start on the first segment. */
1212 return pls->start_seq_no;
1215 static int hls_read_header(AVFormatContext *s)
1217 URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
1218 HLSContext *c = s->priv_data;
1219 int ret = 0, i, j, stream_offset = 0;
1221 c->interrupt_callback = &s->interrupt_callback;
1223 c->first_packet = 1;
1224 c->first_timestamp = AV_NOPTS_VALUE;
1225 c->cur_timestamp = AV_NOPTS_VALUE;
1227 // if the URL context is good, read important options we must broker later
1228 if (u && u->prot->priv_data_class) {
1229 // get the previous user agent & set back to null if string size is zero
1230 av_freep(&c->user_agent);
1231 av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent));
1232 if (c->user_agent && !strlen(c->user_agent))
1233 av_freep(&c->user_agent);
1235 // get the previous cookies & set back to null if string size is zero
1236 av_freep(&c->cookies);
1237 av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies));
1238 if (c->cookies && !strlen(c->cookies))
1239 av_freep(&c->cookies);
1241 // get the previous headers & set back to null if string size is zero
1242 av_freep(&c->headers);
1243 av_opt_get(u->priv_data, "headers", 0, (uint8_t**)&(c->headers));
1244 if (c->headers && !strlen(c->headers))
1245 av_freep(&c->headers);
1248 if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
1251 if (c->n_variants == 0) {
1252 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1256 /* If the playlist only contained playlists (Master Playlist),
1257 * parse each individual playlist. */
1258 if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1259 for (i = 0; i < c->n_playlists; i++) {
1260 struct playlist *pls = c->playlists[i];
1261 if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
1266 if (c->variants[0]->playlists[0]->n_segments == 0) {
1267 av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1272 /* If this isn't a live stream, calculate the total duration of the
1274 if (c->variants[0]->playlists[0]->finished) {
1275 int64_t duration = 0;
1276 for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1277 duration += c->variants[0]->playlists[0]->segments[i]->duration;
1278 s->duration = duration;
1281 /* Associate renditions with variants */
1282 for (i = 0; i < c->n_variants; i++) {
1283 struct variant *var = c->variants[i];
1285 if (var->audio_group[0])
1286 add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
1287 if (var->video_group[0])
1288 add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
1289 if (var->subtitles_group[0])
1290 add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
1293 /* Open the demuxer for each playlist */
1294 for (i = 0; i < c->n_playlists; i++) {
1295 struct playlist *pls = c->playlists[i];
1296 AVInputFormat *in_fmt = NULL;
1298 if (pls->n_segments == 0)
1301 if (!(pls->ctx = avformat_alloc_context())) {
1302 ret = AVERROR(ENOMEM);
1309 pls->cur_seq_no = select_cur_seq_no(c, pls);
1311 pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1312 ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1313 read_data, NULL, NULL);
1314 pls->pb.seekable = 0;
1315 ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1318 /* Free the ctx - it isn't initialized properly at this point,
1319 * so avformat_close_input shouldn't be called. If
1320 * avformat_open_input fails below, it frees and zeros the
1321 * context, so it doesn't need any special treatment like this. */
1322 av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1323 avformat_free_context(pls->ctx);
1327 pls->ctx->pb = &pls->pb;
1328 pls->stream_offset = stream_offset;
1329 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1333 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1334 ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
1335 avformat_queue_attached_pictures(pls->ctx);
1336 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
1337 pls->id3_deferred_extra = NULL;
1340 pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
1341 ret = avformat_find_stream_info(pls->ctx, NULL);
1345 if (pls->is_id3_timestamped == -1)
1346 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1348 /* Create new AVStreams for each stream in this playlist */
1349 for (j = 0; j < pls->ctx->nb_streams; j++) {
1350 AVStream *st = avformat_new_stream(s, NULL);
1351 AVStream *ist = pls->ctx->streams[j];
1353 ret = AVERROR(ENOMEM);
1358 avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
1360 if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1361 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1363 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1366 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
1367 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
1368 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
1370 stream_offset += pls->ctx->nb_streams;
1373 /* Create a program for each variant */
1374 for (i = 0; i < c->n_variants; i++) {
1375 struct variant *v = c->variants[i];
1376 char bitrate_str[20];
1379 snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth);
1381 program = av_new_program(s, i);
1384 av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0);
1386 for (j = 0; j < v->n_playlists; j++) {
1387 struct playlist *pls = v->playlists[j];
1388 int is_shared = playlist_in_multiple_variants(c, pls);
1391 for (k = 0; k < pls->ctx->nb_streams; k++) {
1392 struct AVStream *st = s->streams[pls->stream_offset + k];
1394 ff_program_add_stream_index(s, i, pls->stream_offset + k);
1396 /* Set variant_bitrate for streams unique to this variant */
1397 if (!is_shared && v->bandwidth)
1398 av_dict_set(&st->metadata, "variant_bitrate", bitrate_str, 0);
1405 free_playlist_list(c);
1406 free_variant_list(c);
1407 free_rendition_list(c);
1411 static int recheck_discard_flags(AVFormatContext *s, int first)
1413 HLSContext *c = s->priv_data;
1416 /* Check if any new streams are needed */
1417 for (i = 0; i < c->n_playlists; i++)
1418 c->playlists[i]->cur_needed = 0;
1420 for (i = 0; i < s->nb_streams; i++) {
1421 AVStream *st = s->streams[i];
1422 struct playlist *pls = c->playlists[s->streams[i]->id];
1423 if (st->discard < AVDISCARD_ALL)
1424 pls->cur_needed = 1;
1426 for (i = 0; i < c->n_playlists; i++) {
1427 struct playlist *pls = c->playlists[i];
1428 if (pls->cur_needed && !pls->needed) {
1431 pls->cur_seq_no = select_cur_seq_no(c, pls);
1432 pls->pb.eof_reached = 0;
1433 if (c->cur_timestamp != AV_NOPTS_VALUE) {
1435 pls->seek_timestamp = c->cur_timestamp;
1436 pls->seek_flags = AVSEEK_FLAG_ANY;
1437 pls->seek_stream_index = -1;
1439 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
1440 } else if (first && !pls->cur_needed && pls->needed) {
1442 ffurl_close(pls->input);
1446 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
1452 static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
1454 if (pls->id3_offset >= 0) {
1455 pls->pkt.dts = pls->id3_mpegts_timestamp +
1456 av_rescale_q(pls->id3_offset,
1457 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1459 if (pls->pkt.duration)
1460 pls->id3_offset += pls->pkt.duration;
1462 pls->id3_offset = -1;
1464 /* there have been packets with unknown duration
1465 * since the last id3 tag, should not normally happen */
1466 pls->pkt.dts = AV_NOPTS_VALUE;
1469 if (pls->pkt.duration)
1470 pls->pkt.duration = av_rescale_q(pls->pkt.duration,
1471 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1474 pls->pkt.pts = AV_NOPTS_VALUE;
1477 static AVRational get_timebase(struct playlist *pls)
1479 if (pls->is_id3_timestamped)
1480 return MPEG_TIME_BASE_Q;
1482 return pls->ctx->streams[pls->pkt.stream_index]->time_base;
1485 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
1486 int64_t ts_b, struct playlist *pls_b)
1488 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
1489 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
1491 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
1494 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
1496 HLSContext *c = s->priv_data;
1497 int ret, i, minplaylist = -1;
1499 recheck_discard_flags(s, c->first_packet);
1501 for (i = 0; i < c->n_playlists; i++) {
1502 struct playlist *pls = c->playlists[i];
1503 /* Make sure we've got one buffered packet from each open playlist
1505 if (pls->needed && !pls->pkt.data) {
1509 ret = av_read_frame(pls->ctx, &pls->pkt);
1511 if (!url_feof(&pls->pb) && ret != AVERROR_EOF)
1513 reset_packet(&pls->pkt);
1516 /* stream_index check prevents matching picture attachments etc. */
1517 if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
1518 /* audio elementary streams are id3 timestamped */
1519 fill_timing_for_id3_timestamped_stream(pls);
1522 if (c->first_timestamp == AV_NOPTS_VALUE &&
1523 pls->pkt.dts != AV_NOPTS_VALUE)
1524 c->first_timestamp = av_rescale_q(pls->pkt.dts,
1525 get_timebase(pls), AV_TIME_BASE_Q);
1528 if (pls->seek_timestamp == AV_NOPTS_VALUE)
1531 if (pls->seek_stream_index < 0 ||
1532 pls->seek_stream_index == pls->pkt.stream_index) {
1534 if (pls->pkt.dts == AV_NOPTS_VALUE) {
1535 pls->seek_timestamp = AV_NOPTS_VALUE;
1539 tb = get_timebase(pls);
1540 ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
1541 tb.den, AV_ROUND_DOWN) -
1542 pls->seek_timestamp;
1543 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
1544 pls->pkt.flags & AV_PKT_FLAG_KEY)) {
1545 pls->seek_timestamp = AV_NOPTS_VALUE;
1549 av_free_packet(&pls->pkt);
1550 reset_packet(&pls->pkt);
1553 /* Check if this stream has the packet with the lowest dts */
1554 if (pls->pkt.data) {
1555 struct playlist *minpls = minplaylist < 0 ?
1556 NULL : c->playlists[minplaylist];
1557 if (minplaylist < 0) {
1560 int64_t dts = pls->pkt.dts;
1561 int64_t mindts = minpls->pkt.dts;
1563 if (dts == AV_NOPTS_VALUE ||
1564 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
1570 /* If we got a packet, return it */
1571 if (minplaylist >= 0) {
1572 struct playlist *pls = c->playlists[minplaylist];
1574 pkt->stream_index += pls->stream_offset;
1575 reset_packet(&c->playlists[minplaylist]->pkt);
1577 if (pkt->dts != AV_NOPTS_VALUE)
1578 c->cur_timestamp = av_rescale_q(pkt->dts,
1579 pls->ctx->streams[pls->pkt.stream_index]->time_base,
1587 static int hls_close(AVFormatContext *s)
1589 HLSContext *c = s->priv_data;
1591 free_playlist_list(c);
1592 free_variant_list(c);
1593 free_rendition_list(c);
1597 static int hls_read_seek(AVFormatContext *s, int stream_index,
1598 int64_t timestamp, int flags)
1600 HLSContext *c = s->priv_data;
1601 struct playlist *seek_pls = NULL;
1603 int64_t first_timestamp, seek_timestamp, duration;
1605 if ((flags & AVSEEK_FLAG_BYTE) ||
1606 !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
1607 return AVERROR(ENOSYS);
1609 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
1610 0 : c->first_timestamp;
1612 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
1613 s->streams[stream_index]->time_base.den,
1614 flags & AVSEEK_FLAG_BACKWARD ?
1615 AV_ROUND_DOWN : AV_ROUND_UP);
1617 duration = s->duration == AV_NOPTS_VALUE ?
1620 if (0 < duration && duration < seek_timestamp - first_timestamp)
1621 return AVERROR(EIO);
1623 /* find the playlist with the specified stream */
1624 for (i = 0; i < c->n_playlists; i++) {
1625 struct playlist *pls = c->playlists[i];
1626 if (stream_index >= pls->stream_offset &&
1627 stream_index - pls->stream_offset < pls->ctx->nb_streams) {
1632 /* check if the timestamp is valid for the playlist with the
1633 * specified stream index */
1634 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
1635 return AVERROR(EIO);
1637 /* set segment now so we do not need to search again below */
1638 seek_pls->cur_seq_no = seq_no;
1639 seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset;
1641 for (i = 0; i < c->n_playlists; i++) {
1643 struct playlist *pls = c->playlists[i];
1645 ffurl_close(pls->input);
1648 av_free_packet(&pls->pkt);
1649 reset_packet(&pls->pkt);
1650 pls->pb.eof_reached = 0;
1651 /* Clear any buffered data */
1652 pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
1653 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
1655 /* Flush the packet queue of the subdemuxer. */
1656 ff_read_frame_flush(pls->ctx);
1658 pls->seek_timestamp = seek_timestamp;
1659 pls->seek_flags = flags;
1661 if (pls != seek_pls) {
1662 /* set closest segment seq_no for playlists not handled above */
1663 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
1664 /* seek the playlist to the given position without taking
1665 * keyframes into account since this playlist does not have the
1666 * specified stream where we should look for the keyframes */
1667 pls->seek_stream_index = -1;
1668 pls->seek_flags |= AVSEEK_FLAG_ANY;
1672 c->cur_timestamp = seek_timestamp;
1677 static int hls_probe(AVProbeData *p)
1679 /* Require #EXTM3U at the start, and either one of the ones below
1680 * somewhere for a proper match. */
1681 if (strncmp(p->buf, "#EXTM3U", 7))
1683 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
1684 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
1685 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
1686 return AVPROBE_SCORE_MAX;
1690 AVInputFormat ff_hls_demuxer = {
1691 .name = "hls,applehttp",
1692 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
1693 .priv_data_size = sizeof(HLSContext),
1694 .read_probe = hls_probe,
1695 .read_header = hls_read_header,
1696 .read_packet = hls_read_packet,
1697 .read_close = hls_close,
1698 .read_seek = hls_read_seek,