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 "libavformat/http.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/avassert.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/dict.h"
36 #include "libavutil/time.h"
39 #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;
76 /* associated Media Initialization Section, treated as a segment */
77 struct segment *init_section;
89 * Each playlist has its own demuxer. If it currently is active,
90 * it has an open AVIOContext too, and potentially an AVPacket
91 * containing the next packet from this stream.
94 char url[MAX_URL_SIZE];
99 AVIOContext *input_next;
100 int input_next_requested;
101 AVFormatContext *parent;
103 AVFormatContext *ctx;
105 int has_noheader_flag;
107 /* main demuxer streams associated with this playlist
108 * indexed by the subdemuxer stream indexes */
109 AVStream **main_streams;
113 enum PlaylistType type;
114 int64_t target_duration;
117 struct segment **segments;
122 int m3u8_hold_counters;
123 int64_t cur_seg_offset;
124 int64_t last_load_time;
126 /* Currently active Media Initialization Section */
127 struct segment *cur_init_section;
128 uint8_t *init_sec_buf;
129 unsigned int init_sec_buf_size;
130 unsigned int init_sec_data_len;
131 unsigned int init_sec_buf_read_offset;
133 char key_url[MAX_URL_SIZE];
136 /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
137 * (and possibly other ID3 tags) in the beginning of each segment) */
138 int is_id3_timestamped; /* -1: not yet known */
139 int64_t id3_mpegts_timestamp; /* in mpegts tb */
140 int64_t id3_offset; /* in stream original tb */
141 uint8_t* id3_buf; /* temp buffer for id3 parsing */
142 unsigned int id3_buf_size;
143 AVDictionary *id3_initial; /* data from first id3 tag */
144 int id3_found; /* ID3 tag found at some point */
145 int id3_changed; /* ID3 tag data has changed at some point */
146 ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
148 int64_t seek_timestamp;
150 int seek_stream_index; /* into subdemuxer stream array */
152 /* Renditions associated with this playlist, if any.
153 * Alternative rendition playlists have a single rendition associated
154 * with them, and variant main Media Playlists may have
155 * multiple (playlist-less) renditions associated with them. */
157 struct rendition **renditions;
159 /* Media Initialization Sections (EXT-X-MAP) associated with this
160 * playlist, if any. */
162 struct segment **init_sections;
166 * Renditions are e.g. alternative subtitle or audio streams.
167 * The rendition may either be an external playlist or it may be
168 * contained in the main Media Playlist of the variant (in which case
172 enum AVMediaType type;
173 struct playlist *playlist;
174 char group_id[MAX_FIELD_LEN];
175 char language[MAX_FIELD_LEN];
176 char name[MAX_FIELD_LEN];
183 /* every variant contains at least the main Media Playlist in index 0 */
185 struct playlist **playlists;
187 char audio_group[MAX_FIELD_LEN];
188 char video_group[MAX_FIELD_LEN];
189 char subtitles_group[MAX_FIELD_LEN];
192 typedef struct HLSContext {
194 AVFormatContext *ctx;
196 struct variant **variants;
198 struct playlist **playlists;
200 struct rendition **renditions;
203 int m3u8_hold_counters;
204 int live_start_index;
206 int64_t first_timestamp;
207 int64_t cur_timestamp;
208 AVIOInterruptCB *interrupt_callback;
209 AVDictionary *avio_opts;
210 char *allowed_extensions;
215 AVIOContext *playlist_pb;
218 static void free_segment_dynarray(struct segment **segments, int n_segments)
221 for (i = 0; i < n_segments; i++) {
222 av_freep(&segments[i]->key);
223 av_freep(&segments[i]->url);
224 av_freep(&segments[i]);
228 static void free_segment_list(struct playlist *pls)
230 free_segment_dynarray(pls->segments, pls->n_segments);
231 av_freep(&pls->segments);
235 static void free_init_section_list(struct playlist *pls)
238 for (i = 0; i < pls->n_init_sections; i++) {
239 av_freep(&pls->init_sections[i]->url);
240 av_freep(&pls->init_sections[i]);
242 av_freep(&pls->init_sections);
243 pls->n_init_sections = 0;
246 static void free_playlist_list(HLSContext *c)
249 for (i = 0; i < c->n_playlists; i++) {
250 struct playlist *pls = c->playlists[i];
251 free_segment_list(pls);
252 free_init_section_list(pls);
253 av_freep(&pls->main_streams);
254 av_freep(&pls->renditions);
255 av_freep(&pls->id3_buf);
256 av_dict_free(&pls->id3_initial);
257 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
258 av_freep(&pls->init_sec_buf);
259 av_packet_unref(&pls->pkt);
260 av_freep(&pls->pb.buffer);
261 ff_format_io_close(c->ctx, &pls->input);
262 pls->input_read_done = 0;
263 ff_format_io_close(c->ctx, &pls->input_next);
264 pls->input_next_requested = 0;
267 avformat_close_input(&pls->ctx);
271 av_freep(&c->playlists);
275 static void free_variant_list(HLSContext *c)
278 for (i = 0; i < c->n_variants; i++) {
279 struct variant *var = c->variants[i];
280 av_freep(&var->playlists);
283 av_freep(&c->variants);
287 static void free_rendition_list(HLSContext *c)
290 for (i = 0; i < c->n_renditions; i++)
291 av_freep(&c->renditions[i]);
292 av_freep(&c->renditions);
297 * Used to reset a statically allocated AVPacket to a clean state,
298 * containing no data.
300 static void reset_packet(AVPacket *pkt)
306 static struct playlist *new_playlist(HLSContext *c, const char *url,
309 struct playlist *pls = av_mallocz(sizeof(struct playlist));
312 reset_packet(&pls->pkt);
313 ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
316 pls->seek_timestamp = AV_NOPTS_VALUE;
318 pls->is_id3_timestamped = -1;
319 pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
321 dynarray_add(&c->playlists, &c->n_playlists, pls);
325 struct variant_info {
327 /* variant group ids: */
328 char audio[MAX_FIELD_LEN];
329 char video[MAX_FIELD_LEN];
330 char subtitles[MAX_FIELD_LEN];
333 static struct variant *new_variant(HLSContext *c, struct variant_info *info,
334 const char *url, const char *base)
337 struct playlist *pls;
339 pls = new_playlist(c, url, base);
343 var = av_mallocz(sizeof(struct variant));
348 var->bandwidth = atoi(info->bandwidth);
349 strcpy(var->audio_group, info->audio);
350 strcpy(var->video_group, info->video);
351 strcpy(var->subtitles_group, info->subtitles);
354 dynarray_add(&c->variants, &c->n_variants, var);
355 dynarray_add(&var->playlists, &var->n_playlists, pls);
359 static void handle_variant_args(struct variant_info *info, const char *key,
360 int key_len, char **dest, int *dest_len)
362 if (!strncmp(key, "BANDWIDTH=", key_len)) {
363 *dest = info->bandwidth;
364 *dest_len = sizeof(info->bandwidth);
365 } else if (!strncmp(key, "AUDIO=", key_len)) {
367 *dest_len = sizeof(info->audio);
368 } else if (!strncmp(key, "VIDEO=", key_len)) {
370 *dest_len = sizeof(info->video);
371 } else if (!strncmp(key, "SUBTITLES=", key_len)) {
372 *dest = info->subtitles;
373 *dest_len = sizeof(info->subtitles);
378 char uri[MAX_URL_SIZE];
383 static void handle_key_args(struct key_info *info, const char *key,
384 int key_len, char **dest, int *dest_len)
386 if (!strncmp(key, "METHOD=", key_len)) {
387 *dest = info->method;
388 *dest_len = sizeof(info->method);
389 } else if (!strncmp(key, "URI=", key_len)) {
391 *dest_len = sizeof(info->uri);
392 } else if (!strncmp(key, "IV=", key_len)) {
394 *dest_len = sizeof(info->iv);
398 struct init_section_info {
399 char uri[MAX_URL_SIZE];
403 static struct segment *new_init_section(struct playlist *pls,
404 struct init_section_info *info,
405 const char *url_base)
408 char tmp_str[MAX_URL_SIZE], *ptr = tmp_str;
413 sec = av_mallocz(sizeof(*sec));
417 if (!av_strncasecmp(info->uri, "data:", 5)) {
420 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
426 sec->url = av_strdup(ptr);
432 if (info->byterange[0]) {
433 sec->size = strtoll(info->byterange, NULL, 10);
434 ptr = strchr(info->byterange, '@');
436 sec->url_offset = strtoll(ptr+1, NULL, 10);
438 /* the entire file is the init section */
442 dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
447 static void handle_init_section_args(struct init_section_info *info, const char *key,
448 int key_len, char **dest, int *dest_len)
450 if (!strncmp(key, "URI=", key_len)) {
452 *dest_len = sizeof(info->uri);
453 } else if (!strncmp(key, "BYTERANGE=", key_len)) {
454 *dest = info->byterange;
455 *dest_len = sizeof(info->byterange);
459 struct rendition_info {
461 char uri[MAX_URL_SIZE];
462 char group_id[MAX_FIELD_LEN];
463 char language[MAX_FIELD_LEN];
464 char assoc_language[MAX_FIELD_LEN];
465 char name[MAX_FIELD_LEN];
468 char characteristics[MAX_CHARACTERISTICS_LEN];
471 static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
472 const char *url_base)
474 struct rendition *rend;
475 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
476 char *characteristic;
480 if (!strcmp(info->type, "AUDIO"))
481 type = AVMEDIA_TYPE_AUDIO;
482 else if (!strcmp(info->type, "VIDEO"))
483 type = AVMEDIA_TYPE_VIDEO;
484 else if (!strcmp(info->type, "SUBTITLES"))
485 type = AVMEDIA_TYPE_SUBTITLE;
486 else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
487 /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
488 * AVC SEI RBSP anyway */
491 if (type == AVMEDIA_TYPE_UNKNOWN) {
492 av_log(c->ctx, AV_LOG_WARNING, "Can't support the type: %s\n", info->type);
496 /* URI is mandatory for subtitles as per spec */
497 if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) {
498 av_log(c->ctx, AV_LOG_ERROR, "The URI tag is REQUIRED for subtitle.\n");
502 /* TODO: handle subtitles (each segment has to parsed separately) */
503 if (c->ctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
504 if (type == AVMEDIA_TYPE_SUBTITLE) {
505 av_log(c->ctx, AV_LOG_WARNING, "Can't support the subtitle(uri: %s)\n", info->uri);
509 rend = av_mallocz(sizeof(struct rendition));
513 dynarray_add(&c->renditions, &c->n_renditions, rend);
516 strcpy(rend->group_id, info->group_id);
517 strcpy(rend->language, info->language);
518 strcpy(rend->name, info->name);
520 /* add the playlist if this is an external rendition */
522 rend->playlist = new_playlist(c, info->uri, url_base);
524 dynarray_add(&rend->playlist->renditions,
525 &rend->playlist->n_renditions, rend);
528 if (info->assoc_language[0]) {
529 int langlen = strlen(rend->language);
530 if (langlen < sizeof(rend->language) - 3) {
531 rend->language[langlen] = ',';
532 strncpy(rend->language + langlen + 1, info->assoc_language,
533 sizeof(rend->language) - langlen - 2);
537 if (!strcmp(info->defaultr, "YES"))
538 rend->disposition |= AV_DISPOSITION_DEFAULT;
539 if (!strcmp(info->forced, "YES"))
540 rend->disposition |= AV_DISPOSITION_FORCED;
542 chr_ptr = info->characteristics;
543 while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
544 if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
545 rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
546 else if (!strcmp(characteristic, "public.accessibility.describes-video"))
547 rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
555 static void handle_rendition_args(struct rendition_info *info, const char *key,
556 int key_len, char **dest, int *dest_len)
558 if (!strncmp(key, "TYPE=", key_len)) {
560 *dest_len = sizeof(info->type);
561 } else if (!strncmp(key, "URI=", key_len)) {
563 *dest_len = sizeof(info->uri);
564 } else if (!strncmp(key, "GROUP-ID=", key_len)) {
565 *dest = info->group_id;
566 *dest_len = sizeof(info->group_id);
567 } else if (!strncmp(key, "LANGUAGE=", key_len)) {
568 *dest = info->language;
569 *dest_len = sizeof(info->language);
570 } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
571 *dest = info->assoc_language;
572 *dest_len = sizeof(info->assoc_language);
573 } else if (!strncmp(key, "NAME=", key_len)) {
575 *dest_len = sizeof(info->name);
576 } else if (!strncmp(key, "DEFAULT=", key_len)) {
577 *dest = info->defaultr;
578 *dest_len = sizeof(info->defaultr);
579 } else if (!strncmp(key, "FORCED=", key_len)) {
580 *dest = info->forced;
581 *dest_len = sizeof(info->forced);
582 } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
583 *dest = info->characteristics;
584 *dest_len = sizeof(info->characteristics);
588 * - AUTOSELECT: client may autoselect based on e.g. system language
589 * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
593 /* used by parse_playlist to allocate a new variant+playlist when the
594 * playlist is detected to be a Media Playlist (not Master Playlist)
595 * and we have no parent Master Playlist (parsing of which would have
596 * allocated the variant and playlist already)
597 * *pls == NULL => Master Playlist or parentless Media Playlist
598 * *pls != NULL => parented Media Playlist, playlist+variant allocated */
599 static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
603 if (!new_variant(c, NULL, url, NULL))
604 return AVERROR(ENOMEM);
605 *pls = c->playlists[c->n_playlists - 1];
609 static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb,
610 const char *url, AVDictionary **options)
612 #if !CONFIG_HTTP_PROTOCOL
613 return AVERROR_PROTOCOL_NOT_FOUND;
616 URLContext *uc = ffio_geturlcontext(*pb);
618 (*pb)->eof_reached = 0;
619 ret = ff_http_do_new_request2(uc, url, options);
621 ff_format_io_close(s, pb);
627 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
628 AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
630 HLSContext *c = s->priv_data;
631 AVDictionary *tmp = NULL;
632 const char *proto_name = NULL;
636 if (av_strstart(url, "crypto", NULL)) {
637 if (url[6] == '+' || url[6] == ':')
638 proto_name = avio_find_protocol_name(url + 7);
639 } else if (av_strstart(url, "data", NULL)) {
640 if (url[4] == '+' || url[4] == ':')
641 proto_name = avio_find_protocol_name(url + 5);
645 proto_name = avio_find_protocol_name(url);
648 return AVERROR_INVALIDDATA;
650 // only http(s) & file are allowed
651 if (av_strstart(proto_name, "file", NULL)) {
652 if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
653 av_log(s, AV_LOG_ERROR,
654 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
655 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
657 return AVERROR_INVALIDDATA;
659 } else if (av_strstart(proto_name, "http", NULL)) {
661 } else if (av_strstart(proto_name, "data", NULL)) {
664 return AVERROR_INVALIDDATA;
666 if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
668 else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
670 else if (av_strstart(url, "data", NULL) && !strncmp(proto_name, url + 5, strlen(proto_name)) && url[5 + strlen(proto_name)] == ':')
672 else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
673 return AVERROR_INVALIDDATA;
675 av_dict_copy(&tmp, opts, 0);
676 av_dict_copy(&tmp, opts2, 0);
678 if (is_http && c->http_persistent && *pb) {
679 ret = open_url_keepalive(c->ctx, pb, url, &tmp);
680 if (ret == AVERROR_EXIT) {
683 } else if (ret < 0) {
684 if (ret != AVERROR_EOF)
685 av_log(s, AV_LOG_WARNING,
686 "keepalive request failed for '%s' with error: '%s' when opening url, retrying with new connection\n",
687 url, av_err2str(ret));
688 ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
691 ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
694 // update cookies on http response with setcookies.
695 char *new_cookies = NULL;
697 if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
698 av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
701 av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
707 *is_http_out = is_http;
712 static int parse_playlist(HLSContext *c, const char *url,
713 struct playlist *pls, AVIOContext *in)
715 int ret = 0, is_segment = 0, is_variant = 0;
716 int64_t duration = 0;
717 enum KeyType key_type = KEY_NONE;
720 char key[MAX_URL_SIZE] = "";
721 char line[MAX_URL_SIZE];
724 int64_t seg_offset = 0;
725 int64_t seg_size = -1;
726 uint8_t *new_url = NULL;
727 struct variant_info variant_info;
728 char tmp_str[MAX_URL_SIZE];
729 struct segment *cur_init_section = NULL;
730 int is_http = av_strstart(url, "http", NULL);
731 struct segment **prev_segments = NULL;
732 int prev_n_segments = 0;
733 int prev_start_seq_no = -1;
735 if (is_http && !in && c->http_persistent && c->playlist_pb) {
737 ret = open_url_keepalive(c->ctx, &c->playlist_pb, url, NULL);
738 if (ret == AVERROR_EXIT) {
740 } else if (ret < 0) {
741 if (ret != AVERROR_EOF)
742 av_log(c->ctx, AV_LOG_WARNING,
743 "keepalive request failed for '%s' with error: '%s' when parsing playlist\n",
744 url, av_err2str(ret));
750 AVDictionary *opts = NULL;
751 av_dict_copy(&opts, c->avio_opts, 0);
753 if (c->http_persistent)
754 av_dict_set(&opts, "multiple_requests", "1", 0);
756 ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
761 if (is_http && c->http_persistent)
767 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
770 ff_get_chomp_line(in, line, sizeof(line));
771 if (strcmp(line, "#EXTM3U")) {
772 ret = AVERROR_INVALIDDATA;
777 prev_start_seq_no = pls->start_seq_no;
778 prev_segments = pls->segments;
779 prev_n_segments = pls->n_segments;
780 pls->segments = NULL;
784 pls->type = PLS_TYPE_UNSPECIFIED;
786 while (!avio_feof(in)) {
787 ff_get_chomp_line(in, line, sizeof(line));
788 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
790 memset(&variant_info, 0, sizeof(variant_info));
791 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
793 } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
794 struct key_info info = {{0}};
795 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
799 if (!strcmp(info.method, "AES-128"))
800 key_type = KEY_AES_128;
801 if (!strcmp(info.method, "SAMPLE-AES"))
802 key_type = KEY_SAMPLE_AES;
803 if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
804 ff_hex_to_data(iv, info.iv + 2);
807 av_strlcpy(key, info.uri, sizeof(key));
808 } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
809 struct rendition_info info = {{0}};
810 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
812 new_rendition(c, &info, url);
813 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
814 ret = ensure_playlist(c, &pls, url);
817 pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
818 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
819 ret = ensure_playlist(c, &pls, url);
822 pls->start_seq_no = atoi(ptr);
823 } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
824 ret = ensure_playlist(c, &pls, url);
827 if (!strcmp(ptr, "EVENT"))
828 pls->type = PLS_TYPE_EVENT;
829 else if (!strcmp(ptr, "VOD"))
830 pls->type = PLS_TYPE_VOD;
831 } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
832 struct init_section_info info = {{0}};
833 ret = ensure_playlist(c, &pls, url);
836 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
838 cur_init_section = new_init_section(pls, &info, url);
839 cur_init_section->key_type = key_type;
841 memcpy(cur_init_section->iv, iv, sizeof(iv));
843 int seq = pls->start_seq_no + pls->n_segments;
844 memset(cur_init_section->iv, 0, sizeof(cur_init_section->iv));
845 AV_WB32(cur_init_section->iv + 12, seq);
848 if (key_type != KEY_NONE) {
849 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
851 av_free(cur_init_section);
852 ret = AVERROR_INVALIDDATA;
855 cur_init_section->key = av_strdup(tmp_str);
856 if (!cur_init_section->key) {
857 av_free(cur_init_section);
858 ret = AVERROR(ENOMEM);
862 cur_init_section->key = NULL;
865 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
868 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
870 duration = atof(ptr) * AV_TIME_BASE;
871 } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
872 seg_size = strtoll(ptr, NULL, 10);
873 ptr = strchr(ptr, '@');
875 seg_offset = strtoll(ptr+1, NULL, 10);
876 } else if (av_strstart(line, "#", NULL)) {
877 av_log(c->ctx, AV_LOG_INFO, "Skip ('%s')\n", line);
879 } else if (line[0]) {
881 if (!new_variant(c, &variant_info, line, url)) {
882 ret = AVERROR(ENOMEM);
889 ret = ensure_playlist(c, &pls, url);
892 seg = av_malloc(sizeof(struct segment));
894 ret = AVERROR(ENOMEM);
897 seg->duration = duration;
898 seg->key_type = key_type;
900 memcpy(seg->iv, iv, sizeof(iv));
902 int seq = pls->start_seq_no + pls->n_segments;
903 memset(seg->iv, 0, sizeof(seg->iv));
904 AV_WB32(seg->iv + 12, seq);
907 if (key_type != KEY_NONE) {
908 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
910 ret = AVERROR_INVALIDDATA;
914 seg->key = av_strdup(tmp_str);
917 ret = AVERROR(ENOMEM);
924 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
926 ret = AVERROR_INVALIDDATA;
932 seg->url = av_strdup(tmp_str);
936 ret = AVERROR(ENOMEM);
940 dynarray_add(&pls->segments, &pls->n_segments, seg);
943 seg->size = seg_size;
945 seg->url_offset = seg_offset;
946 seg_offset += seg_size;
953 seg->init_section = cur_init_section;
958 if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
959 int64_t prev_timestamp = c->first_timestamp;
960 int i, diff = pls->start_seq_no - prev_start_seq_no;
961 for (i = 0; i < prev_n_segments && i < diff; i++) {
962 c->first_timestamp += prev_segments[i]->duration;
964 av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%d -> %d)"
965 " reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
966 prev_start_seq_no, pls->start_seq_no,
967 prev_timestamp, c->first_timestamp);
968 } else if (pls->start_seq_no < prev_start_seq_no) {
969 av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %d -> %d\n",
970 prev_start_seq_no, pls->start_seq_no);
972 free_segment_dynarray(prev_segments, prev_n_segments);
973 av_freep(&prev_segments);
976 pls->last_load_time = av_gettime_relative();
981 ff_format_io_close(c->ctx, &in);
982 c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
983 if (!c->n_variants || !c->variants[0]->n_playlists ||
984 !(c->variants[0]->playlists[0]->finished ||
985 c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
986 c->ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
990 static struct segment *current_segment(struct playlist *pls)
992 return pls->segments[pls->cur_seq_no - pls->start_seq_no];
995 static struct segment *next_segment(struct playlist *pls)
997 int n = pls->cur_seq_no - pls->start_seq_no + 1;
998 if (n >= pls->n_segments)
1000 return pls->segments[n];
1003 static int read_from_url(struct playlist *pls, struct segment *seg,
1004 uint8_t *buf, int buf_size)
1008 /* limit read if the segment was only a part of a file */
1010 buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
1012 ret = avio_read(pls->input, buf, buf_size);
1014 pls->cur_seg_offset += ret;
1019 /* Parse the raw ID3 data and pass contents to caller */
1020 static void parse_id3(AVFormatContext *s, AVIOContext *pb,
1021 AVDictionary **metadata, int64_t *dts,
1022 ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
1024 static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
1025 ID3v2ExtraMeta *meta;
1027 ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
1028 for (meta = *extra_meta; meta; meta = meta->next) {
1029 if (!strcmp(meta->tag, "PRIV")) {
1030 ID3v2ExtraMetaPRIV *priv = &meta->data.priv;
1031 if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
1032 /* 33-bit MPEG timestamp */
1033 int64_t ts = AV_RB64(priv->data);
1034 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
1035 if ((ts & ~((1ULL << 33) - 1)) == 0)
1038 av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
1040 } else if (!strcmp(meta->tag, "APIC") && apic)
1041 *apic = &meta->data.apic;
1045 /* Check if the ID3 metadata contents have changed */
1046 static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
1047 ID3v2ExtraMetaAPIC *apic)
1049 AVDictionaryEntry *entry = NULL;
1050 AVDictionaryEntry *oldentry;
1051 /* check that no keys have changed values */
1052 while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
1053 oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
1054 if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
1058 /* check if apic appeared */
1059 if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
1063 int size = pls->ctx->streams[1]->attached_pic.size;
1064 if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
1067 if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
1074 /* Parse ID3 data and handle the found data */
1075 static void handle_id3(AVIOContext *pb, struct playlist *pls)
1077 AVDictionary *metadata = NULL;
1078 ID3v2ExtraMetaAPIC *apic = NULL;
1079 ID3v2ExtraMeta *extra_meta = NULL;
1080 int64_t timestamp = AV_NOPTS_VALUE;
1082 parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta);
1084 if (timestamp != AV_NOPTS_VALUE) {
1085 pls->id3_mpegts_timestamp = timestamp;
1086 pls->id3_offset = 0;
1089 if (!pls->id3_found) {
1090 /* initial ID3 tags */
1091 av_assert0(!pls->id3_deferred_extra);
1094 /* get picture attachment and set text metadata */
1095 if (pls->ctx->nb_streams)
1096 ff_id3v2_parse_apic(pls->ctx, extra_meta);
1098 /* demuxer not yet opened, defer picture attachment */
1099 pls->id3_deferred_extra = extra_meta;
1101 ff_id3v2_parse_priv_dict(&metadata, extra_meta);
1102 av_dict_copy(&pls->ctx->metadata, metadata, 0);
1103 pls->id3_initial = metadata;
1106 if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
1107 avpriv_report_missing_feature(pls->parent, "Changing ID3 metadata in HLS audio elementary stream");
1108 pls->id3_changed = 1;
1110 av_dict_free(&metadata);
1113 if (!pls->id3_deferred_extra)
1114 ff_id3v2_free_extra_meta(&extra_meta);
1117 static void intercept_id3(struct playlist *pls, uint8_t *buf,
1118 int buf_size, int *len)
1120 /* intercept id3 tags, we do not want to pass them to the raw
1121 * demuxer on all segment switches */
1123 int id3_buf_pos = 0;
1125 struct segment *seg = current_segment(pls);
1127 /* gather all the id3 tags */
1129 /* see if we can retrieve enough data for ID3 header */
1130 if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
1131 bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
1134 if (bytes == ID3v2_HEADER_SIZE - *len)
1135 /* no EOF yet, so fill the caller buffer again after
1136 * we have stripped the ID3 tags */
1141 } else if (*len <= 0) {
1148 if (*len < ID3v2_HEADER_SIZE)
1151 if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
1152 int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
1153 int taglen = ff_id3v2_tag_len(buf);
1154 int tag_got_bytes = FFMIN(taglen, *len);
1155 int remaining = taglen - tag_got_bytes;
1157 if (taglen > maxsize) {
1158 av_log(pls->parent, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
1164 * Copy the id3 tag to our temporary id3 buffer.
1165 * We could read a small id3 tag directly without memcpy, but
1166 * we would still need to copy the large tags, and handling
1167 * both of those cases together with the possibility for multiple
1168 * tags would make the handling a bit complex.
1170 pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
1173 memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
1174 id3_buf_pos += tag_got_bytes;
1176 /* strip the intercepted bytes */
1177 *len -= tag_got_bytes;
1178 memmove(buf, buf + tag_got_bytes, *len);
1179 av_log(pls->parent, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
1181 if (remaining > 0) {
1182 /* read the rest of the tag in */
1183 if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
1185 id3_buf_pos += remaining;
1186 av_log(pls->parent, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
1190 /* no more ID3 tags */
1195 /* re-fill buffer for the caller unless EOF */
1196 if (*len >= 0 && (fill_buf || *len == 0)) {
1197 bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
1199 /* ignore error if we already had some data */
1207 /* Now parse all the ID3 tags */
1208 AVIOContext id3ioctx;
1209 ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
1210 handle_id3(&id3ioctx, pls);
1213 if (pls->is_id3_timestamped == -1)
1214 pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
1217 static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
1219 AVDictionary *opts = NULL;
1223 if (c->http_persistent)
1224 av_dict_set(&opts, "multiple_requests", "1", 0);
1226 if (seg->size >= 0) {
1227 /* try to restrict the HTTP request to the part we want
1228 * (if this is in fact a HTTP request) */
1229 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1230 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1233 av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
1234 seg->url, seg->url_offset, pls->index);
1236 if (seg->key_type == KEY_NONE) {
1237 ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
1238 } else if (seg->key_type == KEY_AES_128) {
1239 char iv[33], key[33], url[MAX_URL_SIZE];
1240 if (strcmp(seg->key, pls->key_url)) {
1241 AVIOContext *pb = NULL;
1242 if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
1243 ret = avio_read(pb, pls->key, sizeof(pls->key));
1244 if (ret != sizeof(pls->key)) {
1245 av_log(pls->parent, AV_LOG_ERROR, "Unable to read key file %s\n",
1248 ff_format_io_close(pls->parent, &pb);
1250 av_log(pls->parent, AV_LOG_ERROR, "Unable to open key file %s\n",
1253 av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
1255 ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
1256 ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
1257 iv[32] = key[32] = '\0';
1258 if (strstr(seg->url, "://"))
1259 snprintf(url, sizeof(url), "crypto+%s", seg->url);
1261 snprintf(url, sizeof(url), "crypto:%s", seg->url);
1263 av_dict_set(&opts, "key", key, 0);
1264 av_dict_set(&opts, "iv", iv, 0);
1266 ret = open_url(pls->parent, in, url, c->avio_opts, opts, &is_http);
1271 } else if (seg->key_type == KEY_SAMPLE_AES) {
1272 av_log(pls->parent, AV_LOG_ERROR,
1273 "SAMPLE-AES encryption is not supported yet\n");
1274 ret = AVERROR_PATCHWELCOME;
1277 ret = AVERROR(ENOSYS);
1279 /* Seek to the requested position. If this was a HTTP request, the offset
1280 * should already be where want it to, but this allows e.g. local testing
1281 * without a HTTP server.
1283 * This is not done for HTTP at all as avio_seek() does internal bookkeeping
1284 * of file offset which is out-of-sync with the actual offset when "offset"
1285 * AVOption is used with http protocol, causing the seek to not be a no-op
1286 * as would be expected. Wrong offset received from the server will not be
1287 * noticed without the call, though.
1289 if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
1290 int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
1292 av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
1294 ff_format_io_close(pls->parent, in);
1299 av_dict_free(&opts);
1300 pls->cur_seg_offset = 0;
1304 static int update_init_section(struct playlist *pls, struct segment *seg)
1306 static const int max_init_section_size = 1024*1024;
1307 HLSContext *c = pls->parent->priv_data;
1312 if (seg->init_section == pls->cur_init_section)
1315 pls->cur_init_section = NULL;
1317 if (!seg->init_section)
1320 ret = open_input(c, pls, seg->init_section, &pls->input);
1322 av_log(pls->parent, AV_LOG_WARNING,
1323 "Failed to open an initialization section in playlist %d\n",
1328 if (seg->init_section->size >= 0)
1329 sec_size = seg->init_section->size;
1330 else if ((urlsize = avio_size(pls->input)) >= 0)
1333 sec_size = max_init_section_size;
1335 av_log(pls->parent, AV_LOG_DEBUG,
1336 "Downloading an initialization section of size %"PRId64"\n",
1339 sec_size = FFMIN(sec_size, max_init_section_size);
1341 av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1343 ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
1344 pls->init_sec_buf_size);
1345 ff_format_io_close(pls->parent, &pls->input);
1350 pls->cur_init_section = seg->init_section;
1351 pls->init_sec_data_len = ret;
1352 pls->init_sec_buf_read_offset = 0;
1354 /* spec says audio elementary streams do not have media initialization
1355 * sections, so there should be no ID3 timestamps */
1356 pls->is_id3_timestamped = 0;
1361 static int64_t default_reload_interval(struct playlist *pls)
1363 return pls->n_segments > 0 ?
1364 pls->segments[pls->n_segments - 1]->duration :
1365 pls->target_duration;
1368 static int playlist_needed(struct playlist *pls)
1370 AVFormatContext *s = pls->parent;
1372 int stream_needed = 0;
1375 /* If there is no context or streams yet, the playlist is needed */
1376 if (!pls->ctx || !pls->n_main_streams)
1379 /* check if any of the streams in the playlist are needed */
1380 for (i = 0; i < pls->n_main_streams; i++) {
1381 if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
1387 /* If all streams in the playlist were discarded, the playlist is not
1388 * needed (regardless of whether whole programs are discarded or not). */
1392 /* Otherwise, check if all the programs (variants) this playlist is in are
1393 * discarded. Since all streams in the playlist are part of the same programs
1394 * we can just check the programs of the first stream. */
1396 first_st = pls->main_streams[0]->index;
1398 for (i = 0; i < s->nb_programs; i++) {
1399 AVProgram *program = s->programs[i];
1400 if (program->discard < AVDISCARD_ALL) {
1401 for (j = 0; j < program->nb_stream_indexes; j++) {
1402 if (program->stream_index[j] == first_st) {
1403 /* playlist is in an undiscarded program */
1410 /* some streams were not discarded but all the programs were */
1414 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1416 struct playlist *v = opaque;
1417 HLSContext *c = v->parent->priv_data;
1419 int just_opened = 0;
1420 int reload_count = 0;
1421 struct segment *seg;
1427 if (!v->input || (c->http_persistent && v->input_read_done)) {
1428 int64_t reload_interval;
1430 /* Check that the playlist is still needed before opening a new
1432 v->needed = playlist_needed(v);
1435 av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
1440 /* If this is a live stream and the reload interval has elapsed since
1441 * the last playlist reload, reload the playlists now. */
1442 reload_interval = default_reload_interval(v);
1446 if (reload_count > c->max_reload)
1449 av_gettime_relative() - v->last_load_time >= reload_interval) {
1450 if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1451 if (ret != AVERROR_EXIT)
1452 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1456 /* If we need to reload the playlist again below (if
1457 * there's still no more segments), switch to a reload
1458 * interval of half the target duration. */
1459 reload_interval = v->target_duration / 2;
1461 if (v->cur_seq_no < v->start_seq_no) {
1462 av_log(v->parent, AV_LOG_WARNING,
1463 "skipping %d segments ahead, expired from playlists\n",
1464 v->start_seq_no - v->cur_seq_no);
1465 v->cur_seq_no = v->start_seq_no;
1467 if (v->cur_seq_no > v->last_seq_no) {
1468 v->last_seq_no = v->cur_seq_no;
1469 v->m3u8_hold_counters = 0;
1470 } else if (v->last_seq_no == v->cur_seq_no) {
1471 v->m3u8_hold_counters++;
1472 if (v->m3u8_hold_counters >= c->m3u8_hold_counters) {
1476 av_log(v->parent, AV_LOG_WARNING, "maybe the m3u8 list sequence have been wraped.\n");
1478 if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1481 while (av_gettime_relative() - v->last_load_time < reload_interval) {
1482 if (ff_check_interrupt(c->interrupt_callback))
1483 return AVERROR_EXIT;
1484 av_usleep(100*1000);
1486 /* Enough time has elapsed since the last reload */
1490 v->input_read_done = 0;
1491 seg = current_segment(v);
1493 /* load/update Media Initialization Section, if any */
1494 ret = update_init_section(v, seg);
1498 if (c->http_multiple == 1 && v->input_next_requested) {
1499 FFSWAP(AVIOContext *, v->input, v->input_next);
1500 v->cur_seg_offset = 0;
1501 v->input_next_requested = 0;
1504 ret = open_input(c, v, seg, &v->input);
1507 if (ff_check_interrupt(c->interrupt_callback))
1508 return AVERROR_EXIT;
1509 av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
1518 if (c->http_multiple == -1) {
1519 uint8_t *http_version_opt = NULL;
1520 int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
1522 c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
1523 av_freep(&http_version_opt);
1527 seg = next_segment(v);
1528 if (c->http_multiple == 1 && !v->input_next_requested &&
1529 seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1530 ret = open_input(c, v, seg, &v->input_next);
1532 if (ff_check_interrupt(c->interrupt_callback))
1533 return AVERROR_EXIT;
1534 av_log(v->parent, AV_LOG_WARNING, "Failed to open next segment %d of playlist %d\n",
1538 v->input_next_requested = 1;
1542 if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
1543 /* Push init section out first before first actual segment */
1544 int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1545 memcpy(buf, v->init_sec_buf, copy_size);
1546 v->init_sec_buf_read_offset += copy_size;
1550 seg = current_segment(v);
1551 ret = read_from_url(v, seg, buf, buf_size);
1553 if (just_opened && v->is_id3_timestamped != 0) {
1554 /* Intercept ID3 tags here, elementary audio streams are required
1555 * to convey timestamps using them in the beginning of each segment. */
1556 intercept_id3(v, buf, buf_size, &ret);
1561 if (c->http_persistent &&
1562 seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
1563 v->input_read_done = 1;
1565 ff_format_io_close(v->parent, &v->input);
1569 c->cur_seq_no = v->cur_seq_no;
1574 static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1575 enum AVMediaType type, const char *group_id)
1579 for (i = 0; i < c->n_renditions; i++) {
1580 struct rendition *rend = c->renditions[i];
1582 if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1585 /* rendition is an external playlist
1586 * => add the playlist to the variant */
1587 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1589 /* rendition is part of the variant main Media Playlist
1590 * => add the rendition to the main Media Playlist */
1591 dynarray_add(&var->playlists[0]->renditions,
1592 &var->playlists[0]->n_renditions,
1598 static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1599 enum AVMediaType type)
1604 for (i = 0; i < pls->n_main_streams; i++) {
1605 AVStream *st = pls->main_streams[i];
1607 if (st->codecpar->codec_type != type)
1610 for (; rend_idx < pls->n_renditions; rend_idx++) {
1611 struct rendition *rend = pls->renditions[rend_idx];
1613 if (rend->type != type)
1616 if (rend->language[0])
1617 av_dict_set(&st->metadata, "language", rend->language, 0);
1619 av_dict_set(&st->metadata, "comment", rend->name, 0);
1621 st->disposition |= rend->disposition;
1623 if (rend_idx >=pls->n_renditions)
1628 /* if timestamp was in valid range: returns 1 and sets seq_no
1629 * if not: returns 0 and sets seq_no to closest segment */
1630 static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
1631 int64_t timestamp, int *seq_no)
1634 int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1635 0 : c->first_timestamp;
1637 if (timestamp < pos) {
1638 *seq_no = pls->start_seq_no;
1642 for (i = 0; i < pls->n_segments; i++) {
1643 int64_t diff = pos + pls->segments[i]->duration - timestamp;
1645 *seq_no = pls->start_seq_no + i;
1648 pos += pls->segments[i]->duration;
1651 *seq_no = pls->start_seq_no + pls->n_segments - 1;
1656 static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1660 if (!pls->finished && !c->first_packet &&
1661 av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
1662 /* reload the playlist since it was suspended */
1663 parse_playlist(c, pls->url, pls, NULL);
1665 /* If playback is already in progress (we are just selecting a new
1666 * playlist) and this is a complete file, find the matching segment
1667 * by counting durations. */
1668 if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1669 find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1673 if (!pls->finished) {
1674 if (!c->first_packet && /* we are doing a segment selection during playback */
1675 c->cur_seq_no >= pls->start_seq_no &&
1676 c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1677 /* While spec 3.4.3 says that we cannot assume anything about the
1678 * content at the same sequence number on different playlists,
1679 * in practice this seems to work and doing it otherwise would
1680 * require us to download a segment to inspect its timestamps. */
1681 return c->cur_seq_no;
1683 /* If this is a live stream, start live_start_index segments from the
1685 if (c->live_start_index < 0)
1686 return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
1688 return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
1691 /* Otherwise just start on the first segment. */
1692 return pls->start_seq_no;
1695 static int save_avio_options(AVFormatContext *s)
1697 HLSContext *c = s->priv_data;
1698 static const char * const opts[] = {
1699 "headers", "http_proxy", "user_agent", "cookies", "referer", "rw_timeout", "icy", NULL };
1700 const char * const * opt = opts;
1705 if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
1706 ret = av_dict_set(&c->avio_opts, *opt, buf,
1707 AV_DICT_DONT_STRDUP_VAL);
1717 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1718 int flags, AVDictionary **opts)
1720 av_log(s, AV_LOG_ERROR,
1721 "A HLS playlist item '%s' referred to an external file '%s'. "
1722 "Opening this file was forbidden for security reasons\n",
1724 return AVERROR(EPERM);
1727 static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
1729 HLSContext *c = s->priv_data;
1733 for (i = 0; i < c->n_variants; i++) {
1734 struct variant *v = c->variants[i];
1736 for (j = 0; j < v->n_playlists; j++) {
1737 if (v->playlists[j] != pls)
1740 av_program_add_stream_index(s, i, stream->index);
1743 bandwidth = v->bandwidth;
1744 else if (bandwidth != v->bandwidth)
1745 bandwidth = -1; /* stream in multiple variants with different bandwidths */
1750 av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
1753 static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
1757 err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
1761 if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1762 avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1764 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1766 st->internal->need_context_update = 1;
1771 /* add new subdemuxer streams to our context, if any */
1772 static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
1776 while (pls->n_main_streams < pls->ctx->nb_streams) {
1777 int ist_idx = pls->n_main_streams;
1778 AVStream *st = avformat_new_stream(s, NULL);
1779 AVStream *ist = pls->ctx->streams[ist_idx];
1782 return AVERROR(ENOMEM);
1784 st->id = pls->index;
1785 dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
1787 add_stream_to_programs(s, pls, st);
1789 err = set_stream_info_from_input_stream(st, pls, ist);
1797 static void update_noheader_flag(AVFormatContext *s)
1799 HLSContext *c = s->priv_data;
1800 int flag_needed = 0;
1803 for (i = 0; i < c->n_playlists; i++) {
1804 struct playlist *pls = c->playlists[i];
1806 if (pls->has_noheader_flag) {
1813 s->ctx_flags |= AVFMTCTX_NOHEADER;
1815 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
1818 static int hls_close(AVFormatContext *s)
1820 HLSContext *c = s->priv_data;
1822 free_playlist_list(c);
1823 free_variant_list(c);
1824 free_rendition_list(c);
1826 av_dict_free(&c->avio_opts);
1827 ff_format_io_close(c->ctx, &c->playlist_pb);
1832 static int hls_read_header(AVFormatContext *s)
1834 HLSContext *c = s->priv_data;
1836 int highest_cur_seq_no = 0;
1839 c->interrupt_callback = &s->interrupt_callback;
1841 c->first_packet = 1;
1842 c->first_timestamp = AV_NOPTS_VALUE;
1843 c->cur_timestamp = AV_NOPTS_VALUE;
1845 if ((ret = save_avio_options(s)) < 0)
1848 /* XXX: Some HLS servers don't like being sent the range header,
1849 in this case, need to setting http_seekable = 0 to disable
1851 av_dict_set_int(&c->avio_opts, "seekable", c->http_seekable, 0);
1853 if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
1856 if (c->n_variants == 0) {
1857 av_log(s, AV_LOG_WARNING, "Empty playlist\n");
1861 /* If the playlist only contained playlists (Master Playlist),
1862 * parse each individual playlist. */
1863 if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1864 for (i = 0; i < c->n_playlists; i++) {
1865 struct playlist *pls = c->playlists[i];
1866 pls->m3u8_hold_counters = 0;
1867 if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) {
1868 av_log(s, AV_LOG_WARNING, "parse_playlist error %s [%s]\n", av_err2str(ret), pls->url);
1870 if (c->n_playlists > 1)
1877 for (i = 0; i < c->n_variants; i++) {
1878 if (c->variants[i]->playlists[0]->n_segments == 0) {
1879 av_log(s, AV_LOG_WARNING, "Empty segment [%s]\n", c->variants[i]->playlists[0]->url);
1880 c->variants[i]->playlists[0]->broken = 1;
1884 /* If this isn't a live stream, calculate the total duration of the
1886 if (c->variants[0]->playlists[0]->finished) {
1887 int64_t duration = 0;
1888 for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1889 duration += c->variants[0]->playlists[0]->segments[i]->duration;
1890 s->duration = duration;
1893 /* Associate renditions with variants */
1894 for (i = 0; i < c->n_variants; i++) {
1895 struct variant *var = c->variants[i];
1897 if (var->audio_group[0])
1898 add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
1899 if (var->video_group[0])
1900 add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
1901 if (var->subtitles_group[0])
1902 add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
1905 /* Create a program for each variant */
1906 for (i = 0; i < c->n_variants; i++) {
1907 struct variant *v = c->variants[i];
1910 program = av_new_program(s, i);
1913 av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1916 /* Select the starting segments */
1917 for (i = 0; i < c->n_playlists; i++) {
1918 struct playlist *pls = c->playlists[i];
1920 if (pls->n_segments == 0)
1923 pls->cur_seq_no = select_cur_seq_no(c, pls);
1924 highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
1927 /* Open the demuxer for each playlist */
1928 for (i = 0; i < c->n_playlists; i++) {
1929 struct playlist *pls = c->playlists[i];
1930 ff_const59 AVInputFormat *in_fmt = NULL;
1932 if (!(pls->ctx = avformat_alloc_context())) {
1933 ret = AVERROR(ENOMEM);
1937 if (pls->n_segments == 0)
1945 * If this is a live stream and this playlist looks like it is one segment
1946 * behind, try to sync it up so that every substream starts at the same
1947 * time position (so e.g. avformat_find_stream_info() will see packets from
1948 * all active streams within the first few seconds). This is not very generic,
1949 * though, as the sequence numbers are technically independent.
1951 if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
1952 highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
1953 pls->cur_seq_no = highest_cur_seq_no;
1956 pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1957 if (!pls->read_buffer){
1958 ret = AVERROR(ENOMEM);
1959 avformat_free_context(pls->ctx);
1963 ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1964 read_data, NULL, NULL);
1965 pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4;
1966 pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE;
1967 ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1970 /* Free the ctx - it isn't initialized properly at this point,
1971 * so avformat_close_input shouldn't be called. If
1972 * avformat_open_input fails below, it frees and zeros the
1973 * context, so it doesn't need any special treatment like this. */
1974 av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1975 avformat_free_context(pls->ctx);
1979 pls->ctx->pb = &pls->pb;
1980 pls->ctx->io_open = nested_io_open;
1981 pls->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
1983 if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1986 ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1990 if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1991 ff_id3v2_parse_apic(pls->ctx, pls->id3_deferred_extra);
1992 avformat_queue_attached_pictures(pls->ctx);
1993 ff_id3v2_parse_priv(pls->ctx, pls->id3_deferred_extra);
1994 ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
1997 if (pls->is_id3_timestamped == -1)
1998 av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
2001 * For ID3 timestamped raw audio streams we need to detect the packet
2002 * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
2003 * but for other streams we can rely on our user calling avformat_find_stream_info()
2004 * on us if they want to.
2006 if (pls->is_id3_timestamped || (pls->n_renditions > 0 && pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) {
2007 ret = avformat_find_stream_info(pls->ctx, NULL);
2012 pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
2014 /* Create new AVStreams for each stream in this playlist */
2015 ret = update_streams_from_subdemuxer(s, pls);
2020 * Copy any metadata from playlist to main streams, but do not set
2023 if (pls->n_main_streams)
2024 av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);
2026 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
2027 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
2028 add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
2031 update_noheader_flag(s);
2039 static int recheck_discard_flags(AVFormatContext *s, int first)
2041 HLSContext *c = s->priv_data;
2045 /* Check if any new streams are needed */
2046 for (i = 0; i < c->n_playlists; i++) {
2047 struct playlist *pls = c->playlists[i];
2049 cur_needed = playlist_needed(c->playlists[i]);
2054 if (cur_needed && !pls->needed) {
2057 pls->cur_seq_no = select_cur_seq_no(c, pls);
2058 pls->pb.eof_reached = 0;
2059 if (c->cur_timestamp != AV_NOPTS_VALUE) {
2061 pls->seek_timestamp = c->cur_timestamp;
2062 pls->seek_flags = AVSEEK_FLAG_ANY;
2063 pls->seek_stream_index = -1;
2065 av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
2066 } else if (first && !cur_needed && pls->needed) {
2067 ff_format_io_close(pls->parent, &pls->input);
2068 pls->input_read_done = 0;
2069 ff_format_io_close(pls->parent, &pls->input_next);
2070 pls->input_next_requested = 0;
2073 av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
2079 static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
2081 if (pls->id3_offset >= 0) {
2082 pls->pkt.dts = pls->id3_mpegts_timestamp +
2083 av_rescale_q(pls->id3_offset,
2084 pls->ctx->streams[pls->pkt.stream_index]->time_base,
2086 if (pls->pkt.duration)
2087 pls->id3_offset += pls->pkt.duration;
2089 pls->id3_offset = -1;
2091 /* there have been packets with unknown duration
2092 * since the last id3 tag, should not normally happen */
2093 pls->pkt.dts = AV_NOPTS_VALUE;
2096 if (pls->pkt.duration)
2097 pls->pkt.duration = av_rescale_q(pls->pkt.duration,
2098 pls->ctx->streams[pls->pkt.stream_index]->time_base,
2101 pls->pkt.pts = AV_NOPTS_VALUE;
2104 static AVRational get_timebase(struct playlist *pls)
2106 if (pls->is_id3_timestamped)
2107 return MPEG_TIME_BASE_Q;
2109 return pls->ctx->streams[pls->pkt.stream_index]->time_base;
2112 static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
2113 int64_t ts_b, struct playlist *pls_b)
2115 int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
2116 int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
2118 return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
2121 static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
2123 HLSContext *c = s->priv_data;
2124 int ret, i, minplaylist = -1;
2126 recheck_discard_flags(s, c->first_packet);
2127 c->first_packet = 0;
2129 for (i = 0; i < c->n_playlists; i++) {
2130 struct playlist *pls = c->playlists[i];
2131 /* Make sure we've got one buffered packet from each open playlist
2133 if (pls->needed && !pls->pkt.data) {
2137 ret = av_read_frame(pls->ctx, &pls->pkt);
2139 if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
2141 reset_packet(&pls->pkt);
2144 /* stream_index check prevents matching picture attachments etc. */
2145 if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
2146 /* audio elementary streams are id3 timestamped */
2147 fill_timing_for_id3_timestamped_stream(pls);
2150 if (c->first_timestamp == AV_NOPTS_VALUE &&
2151 pls->pkt.dts != AV_NOPTS_VALUE)
2152 c->first_timestamp = av_rescale_q(pls->pkt.dts,
2153 get_timebase(pls), AV_TIME_BASE_Q);
2156 if (pls->seek_timestamp == AV_NOPTS_VALUE)
2159 if (pls->seek_stream_index < 0 ||
2160 pls->seek_stream_index == pls->pkt.stream_index) {
2162 if (pls->pkt.dts == AV_NOPTS_VALUE) {
2163 pls->seek_timestamp = AV_NOPTS_VALUE;
2167 tb = get_timebase(pls);
2168 ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
2169 tb.den, AV_ROUND_DOWN) -
2170 pls->seek_timestamp;
2171 if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
2172 pls->pkt.flags & AV_PKT_FLAG_KEY)) {
2173 pls->seek_timestamp = AV_NOPTS_VALUE;
2177 av_packet_unref(&pls->pkt);
2180 /* Check if this stream has the packet with the lowest dts */
2181 if (pls->pkt.data) {
2182 struct playlist *minpls = minplaylist < 0 ?
2183 NULL : c->playlists[minplaylist];
2184 if (minplaylist < 0) {
2187 int64_t dts = pls->pkt.dts;
2188 int64_t mindts = minpls->pkt.dts;
2190 if (dts == AV_NOPTS_VALUE ||
2191 (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
2197 /* If we got a packet, return it */
2198 if (minplaylist >= 0) {
2199 struct playlist *pls = c->playlists[minplaylist];
2203 ret = update_streams_from_subdemuxer(s, pls);
2205 av_packet_unref(&pls->pkt);
2209 // If sub-demuxer reports updated metadata, copy it to the first stream
2210 // and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
2211 if (pls->ctx->event_flags & AVFMT_EVENT_FLAG_METADATA_UPDATED) {
2212 if (pls->n_main_streams) {
2213 st = pls->main_streams[0];
2214 av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
2215 st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
2217 pls->ctx->event_flags &= ~AVFMT_EVENT_FLAG_METADATA_UPDATED;
2220 /* check if noheader flag has been cleared by the subdemuxer */
2221 if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
2222 pls->has_noheader_flag = 0;
2223 update_noheader_flag(s);
2226 if (pls->pkt.stream_index >= pls->n_main_streams) {
2227 av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
2228 pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
2229 av_packet_unref(&pls->pkt);
2233 ist = pls->ctx->streams[pls->pkt.stream_index];
2234 st = pls->main_streams[pls->pkt.stream_index];
2236 av_packet_move_ref(pkt, &pls->pkt);
2237 pkt->stream_index = st->index;
2239 if (pkt->dts != AV_NOPTS_VALUE)
2240 c->cur_timestamp = av_rescale_q(pkt->dts,
2244 /* There may be more situations where this would be useful, but this at least
2245 * handles newly probed codecs properly (i.e. request_probe by mpegts). */
2246 if (ist->codecpar->codec_id != st->codecpar->codec_id) {
2247 ret = set_stream_info_from_input_stream(st, pls, ist);
2258 static int hls_read_seek(AVFormatContext *s, int stream_index,
2259 int64_t timestamp, int flags)
2261 HLSContext *c = s->priv_data;
2262 struct playlist *seek_pls = NULL;
2265 int stream_subdemuxer_index;
2266 int64_t first_timestamp, seek_timestamp, duration;
2268 if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
2269 return AVERROR(ENOSYS);
2271 first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
2272 0 : c->first_timestamp;
2274 seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
2275 s->streams[stream_index]->time_base.den,
2276 flags & AVSEEK_FLAG_BACKWARD ?
2277 AV_ROUND_DOWN : AV_ROUND_UP);
2279 duration = s->duration == AV_NOPTS_VALUE ?
2282 if (0 < duration && duration < seek_timestamp - first_timestamp)
2283 return AVERROR(EIO);
2285 /* find the playlist with the specified stream */
2286 for (i = 0; i < c->n_playlists; i++) {
2287 struct playlist *pls = c->playlists[i];
2288 for (j = 0; j < pls->n_main_streams; j++) {
2289 if (pls->main_streams[j] == s->streams[stream_index]) {
2291 stream_subdemuxer_index = j;
2296 /* check if the timestamp is valid for the playlist with the
2297 * specified stream index */
2298 if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
2299 return AVERROR(EIO);
2301 /* set segment now so we do not need to search again below */
2302 seek_pls->cur_seq_no = seq_no;
2303 seek_pls->seek_stream_index = stream_subdemuxer_index;
2305 for (i = 0; i < c->n_playlists; i++) {
2307 struct playlist *pls = c->playlists[i];
2308 ff_format_io_close(pls->parent, &pls->input);
2309 pls->input_read_done = 0;
2310 ff_format_io_close(pls->parent, &pls->input_next);
2311 pls->input_next_requested = 0;
2312 av_packet_unref(&pls->pkt);
2313 pls->pb.eof_reached = 0;
2314 /* Clear any buffered data */
2315 pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
2316 /* Reset the pos, to let the mpegts demuxer know we've seeked. */
2318 /* Flush the packet queue of the subdemuxer. */
2319 ff_read_frame_flush(pls->ctx);
2321 pls->seek_timestamp = seek_timestamp;
2322 pls->seek_flags = flags;
2324 if (pls != seek_pls) {
2325 /* set closest segment seq_no for playlists not handled above */
2326 find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
2327 /* seek the playlist to the given position without taking
2328 * keyframes into account since this playlist does not have the
2329 * specified stream where we should look for the keyframes */
2330 pls->seek_stream_index = -1;
2331 pls->seek_flags |= AVSEEK_FLAG_ANY;
2335 c->cur_timestamp = seek_timestamp;
2340 static int hls_probe(const AVProbeData *p)
2342 /* Require #EXTM3U at the start, and either one of the ones below
2343 * somewhere for a proper match. */
2344 if (strncmp(p->buf, "#EXTM3U", 7))
2347 if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
2348 strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
2349 strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
2350 return AVPROBE_SCORE_MAX;
2354 #define OFFSET(x) offsetof(HLSContext, x)
2355 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2356 static const AVOption hls_options[] = {
2357 {"live_start_index", "segment index to start live streams at (negative values are from the end)",
2358 OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
2359 {"allowed_extensions", "List of file extensions that hls is allowed to access",
2360 OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2361 {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
2362 INT_MIN, INT_MAX, FLAGS},
2363 {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
2364 OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2365 {"m3u8_hold_counters", "The maximum number of times to load m3u8 when it refreshes without new segments",
2366 OFFSET(m3u8_hold_counters), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2367 {"http_persistent", "Use persistent HTTP connections",
2368 OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
2369 {"http_multiple", "Use multiple HTTP connections for fetching segments",
2370 OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
2371 {"http_seekable", "Use HTTP partial requests, 0 = disable, 1 = enable, -1 = auto",
2372 OFFSET(http_seekable), AV_OPT_TYPE_BOOL, { .i64 = -1}, -1, 1, FLAGS},
2376 static const AVClass hls_class = {
2377 .class_name = "hls demuxer",
2378 .item_name = av_default_item_name,
2379 .option = hls_options,
2380 .version = LIBAVUTIL_VERSION_INT,
2383 AVInputFormat ff_hls_demuxer = {
2385 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
2386 .priv_class = &hls_class,
2387 .priv_data_size = sizeof(HLSContext),
2388 .flags = AVFMT_NOGENSEARCH | AVFMT_TS_DISCONT,
2389 .read_probe = hls_probe,
2390 .read_header = hls_read_header,
2391 .read_packet = hls_read_packet,
2392 .read_close = hls_close,
2393 .read_seek = hls_read_seek,