path: root/libavformat/hls.c (plain)
blob: bac53a43500fe870d70aa565ed99188df8a0880b

1	/*
2	* Apple HTTP Live Streaming demuxer
3	* Copyright (c) 2010 Martin Storsjo
4	* Copyright (c) 2013 Anssi Hannula
5	*
6	* This file is part of FFmpeg.
7	*
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.
12	*
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.
17	*
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
21	*/
22
23	/**
24	* @file
25	* Apple HTTP Live Streaming demuxer
26	* http://tools.ietf.org/html/draft-pantos-http-live-streaming
27	*/
28
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"
36	#include "avformat.h"
37	#include "internal.h"
38	#include "avio_internal.h"
39	#include "id3v2.h"
40
41	#define INITIAL_BUFFER_SIZE 32768
42
43	#define MAX_FIELD_LEN 64
44	#define MAX_CHARACTERISTICS_LEN 512
45
46	#define MPEG_TIME_BASE 90000
47	#define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
48
49	/*
50	* An apple http stream consists of a playlist with media segment files,
51	* played sequentially. There may be several playlists with the same
52	* video content, in different bandwidth variants, that are played in
53	* parallel (preferably only one bandwidth variant at a time). In this case,
54	* the user supplied the url to a main playlist that only lists the variant
55	* playlists.
56	*
57	* If the main playlist doesn't point at any variants, we still create
58	* one anonymous toplevel variant for this, to maintain the structure.
59	*/
60
61	enum KeyType {
62	KEY_NONE,
63	KEY_AES_128,
64	KEY_SAMPLE_AES
65	};
66
67	struct segment {
68	int64_t duration;
69	int64_t url_offset;
70	int64_t size;
71	char *url;
72	char *key;
73	enum KeyType key_type;
74	uint8_t iv[16];
75	/* associated Media Initialization Section, treated as a segment */
76	struct segment *init_section;
77	};
78
79	struct rendition;
80
81	enum PlaylistType {
82	PLS_TYPE_UNSPECIFIED,
83	PLS_TYPE_EVENT,
84	PLS_TYPE_VOD
85	};
86
87	/*
88	* Each playlist has its own demuxer. If it currently is active,
89	* it has an open AVIOContext too, and potentially an AVPacket
90	* containing the next packet from this stream.
91	*/
92	struct playlist {
93	char url[MAX_URL_SIZE];
94	AVIOContext pb;
95	uint8_t* read_buffer;
96	AVIOContext *input;
97	AVFormatContext *parent;
98	int index;
99	AVFormatContext *ctx;
100	AVPacket pkt;
101	int has_noheader_flag;
102
103	/* main demuxer streams associated with this playlist
104	* indexed by the subdemuxer stream indexes */
105	AVStream **main_streams;
106	int n_main_streams;
107
108	int finished;
109	enum PlaylistType type;
110	int64_t target_duration;
111	int start_seq_no;
112	int n_segments;
113	struct segment **segments;
114	int needed, cur_needed;
115	int cur_seq_no;
116	int64_t cur_seg_offset;
117	int64_t last_load_time;
118
119	/* Currently active Media Initialization Section */
120	struct segment *cur_init_section;
121	uint8_t *init_sec_buf;
122	unsigned int init_sec_buf_size;
123	unsigned int init_sec_data_len;
124	unsigned int init_sec_buf_read_offset;
125
126	char key_url[MAX_URL_SIZE];
127	uint8_t key[16];
128
129	/* ID3 timestamp handling (elementary audio streams have ID3 timestamps
130	* (and possibly other ID3 tags) in the beginning of each segment) */
131	int is_id3_timestamped; /* -1: not yet known */
132	int64_t id3_mpegts_timestamp; /* in mpegts tb */
133	int64_t id3_offset; /* in stream original tb */
134	uint8_t* id3_buf; /* temp buffer for id3 parsing */
135	unsigned int id3_buf_size;
136	AVDictionary *id3_initial; /* data from first id3 tag */
137	int id3_found; /* ID3 tag found at some point */
138	int id3_changed; /* ID3 tag data has changed at some point */
139	ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
140
141	int64_t seek_timestamp;
142	int seek_flags;
143	int seek_stream_index; /* into subdemuxer stream array */
144
145	/* Renditions associated with this playlist, if any.
146	* Alternative rendition playlists have a single rendition associated
147	* with them, and variant main Media Playlists may have
148	* multiple (playlist-less) renditions associated with them. */
149	int n_renditions;
150	struct rendition **renditions;
151
152	/* Media Initialization Sections (EXT-X-MAP) associated with this
153	* playlist, if any. */
154	int n_init_sections;
155	struct segment **init_sections;
156	};
157
158	/*
159	* Renditions are e.g. alternative subtitle or audio streams.
160	* The rendition may either be an external playlist or it may be
161	* contained in the main Media Playlist of the variant (in which case
162	* playlist is NULL).
163	*/
164	struct rendition {
165	enum AVMediaType type;
166	struct playlist *playlist;
167	char group_id[MAX_FIELD_LEN];
168	char language[MAX_FIELD_LEN];
169	char name[MAX_FIELD_LEN];
170	int disposition;
171	};
172
173	struct variant {
174	int bandwidth;
175
176	/* every variant contains at least the main Media Playlist in index 0 */
177	int n_playlists;
178	struct playlist **playlists;
179
180	char audio_group[MAX_FIELD_LEN];
181	char video_group[MAX_FIELD_LEN];
182	char subtitles_group[MAX_FIELD_LEN];
183	};
184
185	typedef struct HLSContext {
186	AVClass *class;
187	AVFormatContext *ctx;
188	int n_variants;
189	struct variant **variants;
190	int n_playlists;
191	struct playlist **playlists;
192	int n_renditions;
193	struct rendition **renditions;
194
195	int cur_seq_no;
196	int live_start_index;
197	int first_packet;
198	int64_t first_timestamp;
199	int64_t cur_timestamp;
200	AVIOInterruptCB *interrupt_callback;
201	char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
202	char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
203	char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context
204	char *http_proxy; ///< holds the address of the HTTP proxy server
205	AVDictionary *avio_opts;
206	int strict_std_compliance;
207	} HLSContext;
208
209	static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
210	{
211	int len = ff_get_line(s, buf, maxlen);
212	while (len > 0 && av_isspace(buf[len - 1]))
213	buf[--len] = '\0';
214	return len;
215	}
216
217	static void free_segment_list(struct playlist *pls)
218	{
219	int i;
220	for (i = 0; i < pls->n_segments; i++) {
221	av_freep(&pls->segments[i]->key);
222	av_freep(&pls->segments[i]->url);
223	av_freep(&pls->segments[i]);
224	}
225	av_freep(&pls->segments);
226	pls->n_segments = 0;
227	}
228
229	static void free_init_section_list(struct playlist *pls)
230	{
231	int i;
232	for (i = 0; i < pls->n_init_sections; i++) {
233	av_freep(&pls->init_sections[i]->url);
234	av_freep(&pls->init_sections[i]);
235	}
236	av_freep(&pls->init_sections);
237	pls->n_init_sections = 0;
238	}
239
240	static void free_playlist_list(HLSContext *c)
241	{
242	int i;
243	for (i = 0; i < c->n_playlists; i++) {
244	struct playlist *pls = c->playlists[i];
245	free_segment_list(pls);
246	free_init_section_list(pls);
247	av_freep(&pls->main_streams);
248	av_freep(&pls->renditions);
249	av_freep(&pls->id3_buf);
250	av_dict_free(&pls->id3_initial);
251	ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
252	av_freep(&pls->init_sec_buf);
253	av_packet_unref(&pls->pkt);
254	av_freep(&pls->pb.buffer);
255	if (pls->input)
256	ff_format_io_close(c->ctx, &pls->input);
257	if (pls->ctx) {
258	pls->ctx->pb = NULL;
259	avformat_close_input(&pls->ctx);
260	}
261	av_free(pls);
262	}
263	av_freep(&c->playlists);
264	av_freep(&c->cookies);
265	av_freep(&c->user_agent);
266	av_freep(&c->headers);
267	av_freep(&c->http_proxy);
268	c->n_playlists = 0;
269	}
270
271	static void free_variant_list(HLSContext *c)
272	{
273	int i;
274	for (i = 0; i < c->n_variants; i++) {
275	struct variant *var = c->variants[i];
276	av_freep(&var->playlists);
277	av_free(var);
278	}
279	av_freep(&c->variants);
280	c->n_variants = 0;
281	}
282
283	static void free_rendition_list(HLSContext *c)
284	{
285	int i;
286	for (i = 0; i < c->n_renditions; i++)
287	av_freep(&c->renditions[i]);
288	av_freep(&c->renditions);
289	c->n_renditions = 0;
290	}
291
292	/*
293	* Used to reset a statically allocated AVPacket to a clean slate,
294	* containing no data.
295	*/
296	static void reset_packet(AVPacket *pkt)
297	{
298	av_init_packet(pkt);
299	pkt->data = NULL;
300	}
301
302	static struct playlist *new_playlist(HLSContext *c, const char *url,
303	const char *base)
304	{
305	struct playlist *pls = av_mallocz(sizeof(struct playlist));
306	if (!pls)
307	return NULL;
308	reset_packet(&pls->pkt);
309	ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
310	pls->seek_timestamp = AV_NOPTS_VALUE;
311
312	pls->is_id3_timestamped = -1;
313	pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
314
315	dynarray_add(&c->playlists, &c->n_playlists, pls);
316	return pls;
317	}
318
319	struct variant_info {
320	char bandwidth[20];
321	/* variant group ids: */
322	char audio[MAX_FIELD_LEN];
323	char video[MAX_FIELD_LEN];
324	char subtitles[MAX_FIELD_LEN];
325	};
326
327	static struct variant *new_variant(HLSContext *c, struct variant_info *info,
328	const char *url, const char *base)
329	{
330	struct variant *var;
331	struct playlist *pls;
332
333	pls = new_playlist(c, url, base);
334	if (!pls)
335	return NULL;
336
337	var = av_mallocz(sizeof(struct variant));
338	if (!var)
339	return NULL;
340
341	if (info) {
342	var->bandwidth = atoi(info->bandwidth);
343	strcpy(var->audio_group, info->audio);
344	strcpy(var->video_group, info->video);
345	strcpy(var->subtitles_group, info->subtitles);
346	}
347
348	dynarray_add(&c->variants, &c->n_variants, var);
349	dynarray_add(&var->playlists, &var->n_playlists, pls);
350	return var;
351	}
352
353	static void handle_variant_args(struct variant_info *info, const char *key,
354	int key_len, char **dest, int *dest_len)
355	{
356	if (!strncmp(key, "BANDWIDTH=", key_len)) {
357	*dest = info->bandwidth;
358	*dest_len = sizeof(info->bandwidth);
359	} else if (!strncmp(key, "AUDIO=", key_len)) {
360	*dest = info->audio;
361	*dest_len = sizeof(info->audio);
362	} else if (!strncmp(key, "VIDEO=", key_len)) {
363	*dest = info->video;
364	*dest_len = sizeof(info->video);
365	} else if (!strncmp(key, "SUBTITLES=", key_len)) {
366	*dest = info->subtitles;
367	*dest_len = sizeof(info->subtitles);
368	}
369	}
370
371	struct key_info {
372	char uri[MAX_URL_SIZE];
373	char method[11];
374	char iv[35];
375	};
376
377	static void handle_key_args(struct key_info *info, const char *key,
378	int key_len, char **dest, int *dest_len)
379	{
380	if (!strncmp(key, "METHOD=", key_len)) {
381	*dest = info->method;
382	*dest_len = sizeof(info->method);
383	} else if (!strncmp(key, "URI=", key_len)) {
384	*dest = info->uri;
385	*dest_len = sizeof(info->uri);
386	} else if (!strncmp(key, "IV=", key_len)) {
387	*dest = info->iv;
388	*dest_len = sizeof(info->iv);
389	}
390	}
391
392	struct init_section_info {
393	char uri[MAX_URL_SIZE];
394	char byterange[32];
395	};
396
397	static struct segment *new_init_section(struct playlist *pls,
398	struct init_section_info *info,
399	const char *url_base)
400	{
401	struct segment *sec;
402	char *ptr;
403	char tmp_str[MAX_URL_SIZE];
404
405	if (!info->uri[0])
406	return NULL;
407
408	sec = av_mallocz(sizeof(*sec));
409	if (!sec)
410	return NULL;
411
412	ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
413	sec->url = av_strdup(tmp_str);
414	if (!sec->url) {
415	av_free(sec);
416	return NULL;
417	}
418
419	if (info->byterange[0]) {
420	sec->size = strtoll(info->byterange, NULL, 10);
421	ptr = strchr(info->byterange, '@');
422	if (ptr)
423	sec->url_offset = strtoll(ptr+1, NULL, 10);
424	} else {
425	/* the entire file is the init section */
426	sec->size = -1;
427	}
428
429	dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
430
431	return sec;
432	}
433
434	static void handle_init_section_args(struct init_section_info *info, const char *key,
435	int key_len, char **dest, int *dest_len)
436	{
437	if (!strncmp(key, "URI=", key_len)) {
438	*dest = info->uri;
439	*dest_len = sizeof(info->uri);
440	} else if (!strncmp(key, "BYTERANGE=", key_len)) {
441	*dest = info->byterange;
442	*dest_len = sizeof(info->byterange);
443	}
444	}
445
446	struct rendition_info {
447	char type[16];
448	char uri[MAX_URL_SIZE];
449	char group_id[MAX_FIELD_LEN];
450	char language[MAX_FIELD_LEN];
451	char assoc_language[MAX_FIELD_LEN];
452	char name[MAX_FIELD_LEN];
453	char defaultr[4];
454	char forced[4];
455	char characteristics[MAX_CHARACTERISTICS_LEN];
456	};
457
458	static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
459	const char *url_base)
460	{
461	struct rendition *rend;
462	enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
463	char *characteristic;
464	char *chr_ptr;
465	char *saveptr;
466
467	if (!strcmp(info->type, "AUDIO"))
468	type = AVMEDIA_TYPE_AUDIO;
469	else if (!strcmp(info->type, "VIDEO"))
470	type = AVMEDIA_TYPE_VIDEO;
471	else if (!strcmp(info->type, "SUBTITLES"))
472	type = AVMEDIA_TYPE_SUBTITLE;
473	else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
474	/* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
475	* AVC SEI RBSP anyway */
476	return NULL;
477
478	if (type == AVMEDIA_TYPE_UNKNOWN)
479	return NULL;
480
481	/* URI is mandatory for subtitles as per spec */
482	if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
483	return NULL;
484
485	/* TODO: handle subtitles (each segment has to parsed separately) */
486	if (c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
487	if (type == AVMEDIA_TYPE_SUBTITLE)
488	return NULL;
489
490	rend = av_mallocz(sizeof(struct rendition));
491	if (!rend)
492	return NULL;
493
494	dynarray_add(&c->renditions, &c->n_renditions, rend);
495
496	rend->type = type;
497	strcpy(rend->group_id, info->group_id);
498	strcpy(rend->language, info->language);
499	strcpy(rend->name, info->name);
500
501	/* add the playlist if this is an external rendition */
502	if (info->uri[0]) {
503	rend->playlist = new_playlist(c, info->uri, url_base);
504	if (rend->playlist)
505	dynarray_add(&rend->playlist->renditions,
506	&rend->playlist->n_renditions, rend);
507	}
508
509	if (info->assoc_language[0]) {
510	int langlen = strlen(rend->language);
511	if (langlen < sizeof(rend->language) - 3) {
512	rend->language[langlen] = ',';
513	strncpy(rend->language + langlen + 1, info->assoc_language,
514	sizeof(rend->language) - langlen - 2);
515	}
516	}
517
518	if (!strcmp(info->defaultr, "YES"))
519	rend->disposition |= AV_DISPOSITION_DEFAULT;
520	if (!strcmp(info->forced, "YES"))
521	rend->disposition |= AV_DISPOSITION_FORCED;
522
523	chr_ptr = info->characteristics;
524	while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
525	if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
526	rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
527	else if (!strcmp(characteristic, "public.accessibility.describes-video"))
528	rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
529
530	chr_ptr = NULL;
531	}
532
533	return rend;
534	}
535
536	static void handle_rendition_args(struct rendition_info *info, const char *key,
537	int key_len, char **dest, int *dest_len)
538	{
539	if (!strncmp(key, "TYPE=", key_len)) {
540	*dest = info->type;
541	*dest_len = sizeof(info->type);
542	} else if (!strncmp(key, "URI=", key_len)) {
543	*dest = info->uri;
544	*dest_len = sizeof(info->uri);
545	} else if (!strncmp(key, "GROUP-ID=", key_len)) {
546	*dest = info->group_id;
547	*dest_len = sizeof(info->group_id);
548	} else if (!strncmp(key, "LANGUAGE=", key_len)) {
549	*dest = info->language;
550	*dest_len = sizeof(info->language);
551	} else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
552	*dest = info->assoc_language;
553	*dest_len = sizeof(info->assoc_language);
554	} else if (!strncmp(key, "NAME=", key_len)) {
555	*dest = info->name;
556	*dest_len = sizeof(info->name);
557	} else if (!strncmp(key, "DEFAULT=", key_len)) {
558	*dest = info->defaultr;
559	*dest_len = sizeof(info->defaultr);
560	} else if (!strncmp(key, "FORCED=", key_len)) {
561	*dest = info->forced;
562	*dest_len = sizeof(info->forced);
563	} else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
564	*dest = info->characteristics;
565	*dest_len = sizeof(info->characteristics);
566	}
567	/*
568	* ignored:
569	* - AUTOSELECT: client may autoselect based on e.g. system language
570	* - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
571	*/
572	}
573
574	/* used by parse_playlist to allocate a new variant+playlist when the
575	* playlist is detected to be a Media Playlist (not Master Playlist)
576	* and we have no parent Master Playlist (parsing of which would have
577	* allocated the variant and playlist already)
578	* *pls == NULL => Master Playlist or parentless Media Playlist
579	* *pls != NULL => parented Media Playlist, playlist+variant allocated */
580	static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
581	{
582	if (*pls)
583	return 0;
584	if (!new_variant(c, NULL, url, NULL))
585	return AVERROR(ENOMEM);
586	*pls = c->playlists[c->n_playlists - 1];
587	return 0;
588	}
589
590	static void update_options(char **dest, const char *name, void *src)
591	{
592	av_freep(dest);
593	av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest);
594	if (*dest && !strlen(*dest))
595	av_freep(dest);
596	}
597
598	static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
599	AVDictionary *opts, AVDictionary *opts2, int *is_http)
600	{
601	HLSContext *c = s->priv_data;
602	AVDictionary *tmp = NULL;
603	const char *proto_name = NULL;
604	int ret;
605
606	av_dict_copy(&tmp, opts, 0);
607	av_dict_copy(&tmp, opts2, 0);
608
609	if (av_strstart(url, "crypto", NULL)) {
610	if (url[6] == '+' || url[6] == ':')
611	proto_name = avio_find_protocol_name(url + 7);
612	}
613
614	if (!proto_name)
615	proto_name = avio_find_protocol_name(url);
616
617	if (!proto_name)
618	return AVERROR_INVALIDDATA;
619
620	// only http(s) & file are allowed
621	if (!av_strstart(proto_name, "http", NULL) && !av_strstart(proto_name, "file", NULL))
622	return AVERROR_INVALIDDATA;
623	if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
624	;
625	else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
626	;
627	else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
628	return AVERROR_INVALIDDATA;
629
630	ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
631	if (ret >= 0) {
632	// update cookies on http response with setcookies.
633	void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
634	update_options(&c->cookies, "cookies", u);
635	av_dict_set(&opts, "cookies", c->cookies, 0);
636	}
637
638	av_dict_free(&tmp);
639
640	if (is_http)
641	*is_http = av_strstart(proto_name, "http", NULL);
642
643	return ret;
644	}
645
646	static int parse_playlist(HLSContext *c, const char *url,
647	struct playlist *pls, AVIOContext *in)
648	{
649	int ret = 0, is_segment = 0, is_variant = 0;
650	int64_t duration = 0;
651	enum KeyType key_type = KEY_NONE;
652	uint8_t iv[16] = "";
653	int has_iv = 0;
654	char key[MAX_URL_SIZE] = "";
655	char line[MAX_URL_SIZE];
656	const char *ptr;
657	int close_in = 0;
658	int64_t seg_offset = 0;
659	int64_t seg_size = -1;
660	uint8_t *new_url = NULL;
661	struct variant_info variant_info;
662	char tmp_str[MAX_URL_SIZE];
663	struct segment *cur_init_section = NULL;
664
665	if (!in) {
666	#if 1
667	AVDictionary *opts = NULL;
668	close_in = 1;
669	/* Some HLS servers don't like being sent the range header */
670	av_dict_set(&opts, "seekable", "0", 0);
671
672	// broker prior HTTP options that should be consistent across requests
673	av_dict_set(&opts, "user_agent", c->user_agent, 0);
674	av_dict_set(&opts, "cookies", c->cookies, 0);
675	av_dict_set(&opts, "headers", c->headers, 0);
676	av_dict_set(&opts, "http_proxy", c->http_proxy, 0);
677
678	ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
679	av_dict_free(&opts);
680	if (ret < 0)
681	return ret;
682	#else
683	ret = open_in(c, &in, url);
684	if (ret < 0)
685	return ret;
686	close_in = 1;
687	#endif
688	}
689
690	if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
691	url = new_url;
692
693	read_chomp_line(in, line, sizeof(line));
694	if (strcmp(line, "#EXTM3U")) {
695	ret = AVERROR_INVALIDDATA;
696	goto fail;
697	}
698
699	if (pls) {
700	free_segment_list(pls);
701	pls->finished = 0;
702	pls->type = PLS_TYPE_UNSPECIFIED;
703	}
704	while (!avio_feof(in)) {
705	read_chomp_line(in, line, sizeof(line));
706	if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
707	is_variant = 1;
708	memset(&variant_info, 0, sizeof(variant_info));
709	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
710	&variant_info);
711	} else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
712	struct key_info info = {{0}};
713	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
714	&info);
715	key_type = KEY_NONE;
716	has_iv = 0;
717	if (!strcmp(info.method, "AES-128"))
718	key_type = KEY_AES_128;
719	if (!strcmp(info.method, "SAMPLE-AES"))
720	key_type = KEY_SAMPLE_AES;
721	if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
722	ff_hex_to_data(iv, info.iv + 2);
723	has_iv = 1;
724	}
725	av_strlcpy(key, info.uri, sizeof(key));
726	} else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
727	struct rendition_info info = {{0}};
728	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
729	&info);
730	new_rendition(c, &info, url);
731	} else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
732	ret = ensure_playlist(c, &pls, url);
733	if (ret < 0)
734	goto fail;
735	pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
736	} else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
737	ret = ensure_playlist(c, &pls, url);
738	if (ret < 0)
739	goto fail;
740	pls->start_seq_no = atoi(ptr);
741	} else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
742	ret = ensure_playlist(c, &pls, url);
743	if (ret < 0)
744	goto fail;
745	if (!strcmp(ptr, "EVENT"))
746	pls->type = PLS_TYPE_EVENT;
747	else if (!strcmp(ptr, "VOD"))
748	pls->type = PLS_TYPE_VOD;
749	} else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
750	struct init_section_info info = {{0}};
751	ret = ensure_playlist(c, &pls, url);
752	if (ret < 0)
753	goto fail;
754	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
755	&info);
756	cur_init_section = new_init_section(pls, &info, url);
757	} else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
758	if (pls)
759	pls->finished = 1;
760	} else if (av_strstart(line, "#EXTINF:", &ptr)) {
761	is_segment = 1;
762	duration = atof(ptr) * AV_TIME_BASE;
763	} else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
764	seg_size = strtoll(ptr, NULL, 10);
765	ptr = strchr(ptr, '@');
766	if (ptr)
767	seg_offset = strtoll(ptr+1, NULL, 10);
768	} else if (av_strstart(line, "#", NULL)) {
769	continue;
770	} else if (line[0]) {
771	if (is_variant) {
772	if (!new_variant(c, &variant_info, line, url)) {
773	ret = AVERROR(ENOMEM);
774	goto fail;
775	}
776	is_variant = 0;
777	}
778	if (is_segment) {
779	struct segment *seg;
780	if (!pls) {
781	if (!new_variant(c, 0, url, NULL)) {
782	ret = AVERROR(ENOMEM);
783	goto fail;
784	}
785	pls = c->playlists[c->n_playlists - 1];
786	}
787	seg = av_malloc(sizeof(struct segment));
788	if (!seg) {
789	ret = AVERROR(ENOMEM);
790	goto fail;
791	}
792	seg->duration = duration;
793	seg->key_type = key_type;
794	if (has_iv) {
795	memcpy(seg->iv, iv, sizeof(iv));
796	} else {
797	int seq = pls->start_seq_no + pls->n_segments;
798	memset(seg->iv, 0, sizeof(seg->iv));
799	AV_WB32(seg->iv + 12, seq);
800	}
801
802	if (key_type != KEY_NONE) {
803	ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
804	seg->key = av_strdup(tmp_str);
805	if (!seg->key) {
806	av_free(seg);
807	ret = AVERROR(ENOMEM);
808	goto fail;
809	}
810	} else {
811	seg->key = NULL;
812	}
813
814	ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
815	seg->url = av_strdup(tmp_str);
816	if (!seg->url) {
817	av_free(seg->key);
818	av_free(seg);
819	ret = AVERROR(ENOMEM);
820	goto fail;
821	}
822
823	dynarray_add(&pls->segments, &pls->n_segments, seg);
824	is_segment = 0;
825
826	seg->size = seg_size;
827	if (seg_size >= 0) {
828	seg->url_offset = seg_offset;
829	seg_offset += seg_size;
830	seg_size = -1;
831	} else {
832	seg->url_offset = 0;
833	seg_offset = 0;
834	}
835
836	seg->init_section = cur_init_section;
837	}
838	}
839	}
840	if (pls)
841	pls->last_load_time = av_gettime_relative();
842
843	fail:
844	av_free(new_url);
845	if (close_in)
846	ff_format_io_close(c->ctx, &in);
847	return ret;
848	}
849
850	static struct segment *current_segment(struct playlist *pls)
851	{
852	return pls->segments[pls->cur_seq_no - pls->start_seq_no];
853	}
854
855	enum ReadFromURLMode {
856	READ_NORMAL,
857	READ_COMPLETE,
858	};
859
860	static int read_from_url(struct playlist *pls, struct segment *seg,
861	uint8_t *buf, int buf_size,
862	enum ReadFromURLMode mode)
863	{
864	int ret;
865
866	/* limit read if the segment was only a part of a file */
867	if (seg->size >= 0)
868	buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
869
870	if (mode == READ_COMPLETE) {
871	ret = avio_read(pls->input, buf, buf_size);
872	if (ret != buf_size)
873	av_log(NULL, AV_LOG_ERROR, "Could not read complete segment.\n");
874	} else
875	ret = avio_read(pls->input, buf, buf_size);
876
877	if (ret > 0)
878	pls->cur_seg_offset += ret;
879
880	return ret;
881	}
882
883	/* Parse the raw ID3 data and pass contents to caller */
884	static void parse_id3(AVFormatContext *s, AVIOContext *pb,
885	AVDictionary **metadata, int64_t *dts,
886	ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
887	{
888	static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
889	ID3v2ExtraMeta *meta;
890
891	ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
892	for (meta = *extra_meta; meta; meta = meta->next) {
893	if (!strcmp(meta->tag, "PRIV")) {
894	ID3v2ExtraMetaPRIV *priv = meta->data;
895	if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
896	/* 33-bit MPEG timestamp */
897	int64_t ts = AV_RB64(priv->data);
898	av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
899	if ((ts & ~((1ULL << 33) - 1)) == 0)
900	*dts = ts;
901	else
902	av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
903	}
904	} else if (!strcmp(meta->tag, "APIC") && apic)
905	*apic = meta->data;
906	}
907	}
908
909	/* Check if the ID3 metadata contents have changed */
910	static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
911	ID3v2ExtraMetaAPIC *apic)
912	{
913	AVDictionaryEntry *entry = NULL;
914	AVDictionaryEntry *oldentry;
915	/* check that no keys have changed values */
916	while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
917	oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
918	if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
919	return 1;
920	}
921
922	/* check if apic appeared */
923	if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
924	return 1;
925
926	if (apic) {
927	int size = pls->ctx->streams[1]->attached_pic.size;
928	if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
929	return 1;
930
931	if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
932	return 1;
933	}
934
935	return 0;
936	}
937
938	/* Parse ID3 data and handle the found data */
939	static void handle_id3(AVIOContext *pb, struct playlist *pls)
940	{
941	AVDictionary *metadata = NULL;
942	ID3v2ExtraMetaAPIC *apic = NULL;
943	ID3v2ExtraMeta *extra_meta = NULL;
944	int64_t timestamp = AV_NOPTS_VALUE;
945
946	parse_id3(pls->ctx, pb, &metadata, &timestamp, &apic, &extra_meta);
947
948	if (timestamp != AV_NOPTS_VALUE) {
949	pls->id3_mpegts_timestamp = timestamp;
950	pls->id3_offset = 0;
951	}
952
953	if (!pls->id3_found) {
954	/* initial ID3 tags */
955	av_assert0(!pls->id3_deferred_extra);
956	pls->id3_found = 1;
957
958	/* get picture attachment and set text metadata */
959	if (pls->ctx->nb_streams)
960	ff_id3v2_parse_apic(pls->ctx, &extra_meta);
961	else
962	/* demuxer not yet opened, defer picture attachment */
963	pls->id3_deferred_extra = extra_meta;
964
965	av_dict_copy(&pls->ctx->metadata, metadata, 0);
966	pls->id3_initial = metadata;
967
968	} else {
969	if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
970	avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
971	pls->id3_changed = 1;
972	}
973	av_dict_free(&metadata);
974	}
975
976	if (!pls->id3_deferred_extra)
977	ff_id3v2_free_extra_meta(&extra_meta);
978	}
979
980	static void intercept_id3(struct playlist *pls, uint8_t *buf,
981	int buf_size, int *len)
982	{
983	/* intercept id3 tags, we do not want to pass them to the raw
984	* demuxer on all segment switches */
985	int bytes;
986	int id3_buf_pos = 0;
987	int fill_buf = 0;
988	struct segment *seg = current_segment(pls);
989
990	/* gather all the id3 tags */
991	while (1) {
992	/* see if we can retrieve enough data for ID3 header */
993	if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
994	bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE);
995	if (bytes > 0) {
996
997	if (bytes == ID3v2_HEADER_SIZE - *len)
998	/* no EOF yet, so fill the caller buffer again after
999	* we have stripped the ID3 tags */
1000	fill_buf = 1;
1001
1002	*len += bytes;
1003
1004	} else if (*len <= 0) {
1005	/* error/EOF */
1006	*len = bytes;
1007	fill_buf = 0;
1008	}
1009	}
1010
1011	if (*len < ID3v2_HEADER_SIZE)
1012	break;
1013
1014	if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
1015	int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
1016	int taglen = ff_id3v2_tag_len(buf);
1017	int tag_got_bytes = FFMIN(taglen, *len);
1018	int remaining = taglen - tag_got_bytes;
1019
1020	if (taglen > maxsize) {
1021	av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
1022	taglen, maxsize);
1023	break;
1024	}
1025
1026	/*
1027	* Copy the id3 tag to our temporary id3 buffer.
1028	* We could read a small id3 tag directly without memcpy, but
1029	* we would still need to copy the large tags, and handling
1030	* both of those cases together with the possibility for multiple
1031	* tags would make the handling a bit complex.
1032	*/
1033	pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
1034	if (!pls->id3_buf)
1035	break;
1036	memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
1037	id3_buf_pos += tag_got_bytes;
1038
1039	/* strip the intercepted bytes */
1040	*len -= tag_got_bytes;
1041	memmove(buf, buf + tag_got_bytes, *len);
1042	av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
1043
1044	if (remaining > 0) {
1045	/* read the rest of the tag in */
1046	if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
1047	break;
1048	id3_buf_pos += remaining;
1049	av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
1050	}
1051
1052	} else {
1053	/* no more ID3 tags */
1054	break;
1055	}
1056	}
1057
1058	/* re-fill buffer for the caller unless EOF */
1059	if (*len >= 0 && (fill_buf || *len == 0)) {
1060	bytes = read_from_url(pls, seg, buf + *len, buf_size - *len, READ_NORMAL);
1061
1062	/* ignore error if we already had some data */
1063	if (bytes >= 0)
1064	*len += bytes;
1065	else if (*len == 0)
1066	*len = bytes;
1067	}
1068
1069	if (pls->id3_buf) {
1070	/* Now parse all the ID3 tags */
1071	AVIOContext id3ioctx;
1072	ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
1073	handle_id3(&id3ioctx, pls);
1074	}
1075
1076	if (pls->is_id3_timestamped == -1)
1077	pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
1078	}
1079
1080	static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg)
1081	{
1082	AVDictionary *opts = NULL;
1083	int ret;
1084	int is_http = 0;
1085
1086	// broker prior HTTP options that should be consistent across requests
1087	av_dict_set(&opts, "user_agent", c->user_agent, 0);
1088	av_dict_set(&opts, "cookies", c->cookies, 0);
1089	av_dict_set(&opts, "headers", c->headers, 0);
1090	av_dict_set(&opts, "http_proxy", c->http_proxy, 0);
1091	av_dict_set(&opts, "seekable", "0", 0);
1092
1093	if (seg->size >= 0) {
1094	/* try to restrict the HTTP request to the part we want
1095	* (if this is in fact a HTTP request) */
1096	av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1097	av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1098	}
1099
1100	av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
1101	seg->url, seg->url_offset, pls->index);
1102
1103	if (seg->key_type == KEY_NONE) {
1104	ret = open_url(pls->parent, &pls->input, seg->url, c->avio_opts, opts, &is_http);
1105	} else if (seg->key_type == KEY_AES_128) {
1106	AVDictionary *opts2 = NULL;
1107	char iv[33], key[33], url[MAX_URL_SIZE];
1108	if (strcmp(seg->key, pls->key_url)) {
1109	AVIOContext *pb;
1110	if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
1111	ret = avio_read(pb, pls->key, sizeof(pls->key));
1112	if (ret != sizeof(pls->key)) {
1113	av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
1114	seg->key);
1115	}
1116	ff_format_io_close(pls->parent, &pb);
1117	} else {
1118	av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
1119	seg->key);
1120	}
1121	av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
1122	}
1123	ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
1124	ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
1125	iv[32] = key[32] = '\0';
1126	if (strstr(seg->url, "://"))
1127	snprintf(url, sizeof(url), "crypto+%s", seg->url);
1128	else
1129	snprintf(url, sizeof(url), "crypto:%s", seg->url);
1130
1131	av_dict_copy(&opts2, c->avio_opts, 0);
1132	av_dict_set(&opts2, "key", key, 0);
1133	av_dict_set(&opts2, "iv", iv, 0);
1134
1135	ret = open_url(pls->parent, &pls->input, url, opts2, opts, &is_http);
1136
1137	av_dict_free(&opts2);
1138
1139	if (ret < 0) {
1140	goto cleanup;
1141	}
1142	ret = 0;
1143	} else if (seg->key_type == KEY_SAMPLE_AES) {
1144	av_log(pls->parent, AV_LOG_ERROR,
1145	"SAMPLE-AES encryption is not supported yet\n");
1146	ret = AVERROR_PATCHWELCOME;
1147	}
1148	else
1149	ret = AVERROR(ENOSYS);
1150
1151	/* Seek to the requested position. If this was a HTTP request, the offset
1152	* should already be where want it to, but this allows e.g. local testing
1153	* without a HTTP server.
1154	*
1155	* This is not done for HTTP at all as avio_seek() does internal bookkeeping
1156	* of file offset which is out-of-sync with the actual offset when "offset"
1157	* AVOption is used with http protocol, causing the seek to not be a no-op
1158	* as would be expected. Wrong offset received from the server will not be
1159	* noticed without the call, though.
1160	*/
1161	if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
1162	int64_t seekret = avio_seek(pls->input, seg->url_offset, SEEK_SET);
1163	if (seekret < 0) {
1164	av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
1165	ret = seekret;
1166	ff_format_io_close(pls->parent, &pls->input);
1167	}
1168	}
1169
1170	cleanup:
1171	av_dict_free(&opts);
1172	pls->cur_seg_offset = 0;
1173	return ret;
1174	}
1175
1176	static int update_init_section(struct playlist *pls, struct segment *seg)
1177	{
1178	static const int max_init_section_size = 1024*1024;
1179	HLSContext *c = pls->parent->priv_data;
1180	int64_t sec_size;
1181	int64_t urlsize;
1182	int ret;
1183
1184	if (seg->init_section == pls->cur_init_section)
1185	return 0;
1186
1187	pls->cur_init_section = NULL;
1188
1189	if (!seg->init_section)
1190	return 0;
1191
1192	ret = open_input(c, pls, seg->init_section);
1193	if (ret < 0) {
1194	av_log(pls->parent, AV_LOG_WARNING,
1195	"Failed to open an initialization section in playlist %d\n",
1196	pls->index);
1197	return ret;
1198	}
1199
1200	if (seg->init_section->size >= 0)
1201	sec_size = seg->init_section->size;
1202	else if ((urlsize = avio_size(pls->input)) >= 0)
1203	sec_size = urlsize;
1204	else
1205	sec_size = max_init_section_size;
1206
1207	av_log(pls->parent, AV_LOG_DEBUG,
1208	"Downloading an initialization section of size %"PRId64"\n",
1209	sec_size);
1210
1211	sec_size = FFMIN(sec_size, max_init_section_size);
1212
1213	av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1214
1215	ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
1216	pls->init_sec_buf_size, READ_COMPLETE);
1217	ff_format_io_close(pls->parent, &pls->input);
1218
1219	if (ret < 0)
1220	return ret;
1221
1222	pls->cur_init_section = seg->init_section;
1223	pls->init_sec_data_len = ret;
1224	pls->init_sec_buf_read_offset = 0;
1225
1226	/* spec says audio elementary streams do not have media initialization
1227	* sections, so there should be no ID3 timestamps */
1228	pls->is_id3_timestamped = 0;
1229
1230	return 0;
1231	}
1232
1233	static int64_t default_reload_interval(struct playlist *pls)
1234	{
1235	return pls->n_segments > 0 ?
1236	pls->segments[pls->n_segments - 1]->duration :
1237	pls->target_duration;
1238	}
1239
1240	static int read_data(void *opaque, uint8_t *buf, int buf_size)
1241	{
1242	struct playlist *v = opaque;
1243	HLSContext *c = v->parent->priv_data;
1244	int ret, i;
1245	int just_opened = 0;
1246
1247	restart:
1248	if (!v->needed)
1249	return AVERROR_EOF;
1250
1251	if (!v->input) {
1252	int64_t reload_interval;
1253	struct segment *seg;
1254
1255	/* Check that the playlist is still needed before opening a new
1256	* segment. */
1257	if (v->ctx && v->ctx->nb_streams) {
1258	v->needed = 0;
1259	for (i = 0; i < v->n_main_streams; i++) {
1260	if (v->main_streams[i]->discard < AVDISCARD_ALL) {
1261	v->needed = 1;
1262	break;
1263	}
1264	}
1265	}
1266	if (!v->needed) {
1267	av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
1268	v->index);
1269	return AVERROR_EOF;
1270	}
1271
1272	/* If this is a live stream and the reload interval has elapsed since
1273	* the last playlist reload, reload the playlists now. */
1274	reload_interval = default_reload_interval(v);
1275
1276	reload:
1277	if (!v->finished &&
1278	av_gettime_relative() - v->last_load_time >= reload_interval) {
1279	if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
1280	av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
1281	v->index);
1282	return ret;
1283	}
1284	/* If we need to reload the playlist again below (if
1285	* there's still no more segments), switch to a reload
1286	* interval of half the target duration. */
1287	reload_interval = v->target_duration / 2;
1288	}
1289	if (v->cur_seq_no < v->start_seq_no) {
1290	av_log(NULL, AV_LOG_WARNING,
1291	"skipping %d segments ahead, expired from playlists\n",
1292	v->start_seq_no - v->cur_seq_no);
1293	v->cur_seq_no = v->start_seq_no;
1294	}
1295	if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
1296	if (v->finished)
1297	return AVERROR_EOF;
1298	while (av_gettime_relative() - v->last_load_time < reload_interval) {
1299	if (ff_check_interrupt(c->interrupt_callback))
1300	return AVERROR_EXIT;
1301	av_usleep(100*1000);
1302	}
1303	/* Enough time has elapsed since the last reload */
1304	goto reload;
1305	}
1306
1307	seg = current_segment(v);
1308
1309	/* load/update Media Initialization Section, if any */
1310	ret = update_init_section(v, seg);
1311	if (ret)
1312	return ret;
1313
1314	ret = open_input(c, v, seg);
1315	if (ret < 0) {
1316	if (ff_check_interrupt(c->interrupt_callback))
1317	return AVERROR_EXIT;
1318	av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
1319	v->index);
1320	v->cur_seq_no += 1;
1321	goto reload;
1322	}
1323	just_opened = 1;
1324	}
1325
1326	if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
1327	/* Push init section out first before first actual segment */
1328	int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1329	memcpy(buf, v->init_sec_buf, copy_size);
1330	v->init_sec_buf_read_offset += copy_size;
1331	return copy_size;
1332	}
1333
1334	ret = read_from_url(v, current_segment(v), buf, buf_size, READ_NORMAL);
1335	if (ret > 0) {
1336	if (just_opened && v->is_id3_timestamped != 0) {
1337	/* Intercept ID3 tags here, elementary audio streams are required
1338	* to convey timestamps using them in the beginning of each segment. */
1339	intercept_id3(v, buf, buf_size, &ret);
1340	}
1341
1342	return ret;
1343	}
1344	ff_format_io_close(v->parent, &v->input);
1345	v->cur_seq_no++;
1346
1347	c->cur_seq_no = v->cur_seq_no;
1348
1349	goto restart;
1350	}
1351
1352	static void add_renditions_to_variant(HLSContext *c, struct variant *var,
1353	enum AVMediaType type, const char *group_id)
1354	{
1355	int i;
1356
1357	for (i = 0; i < c->n_renditions; i++) {
1358	struct rendition *rend = c->renditions[i];
1359
1360	if (rend->type == type && !strcmp(rend->group_id, group_id)) {
1361
1362	if (rend->playlist)
1363	/* rendition is an external playlist
1364	* => add the playlist to the variant */
1365	dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
1366	else
1367	/* rendition is part of the variant main Media Playlist
1368	* => add the rendition to the main Media Playlist */
1369	dynarray_add(&var->playlists[0]->renditions,
1370	&var->playlists[0]->n_renditions,
1371	rend);
1372	}
1373	}
1374	}
1375
1376	static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
1377	enum AVMediaType type)
1378	{
1379	int rend_idx = 0;
1380	int i;
1381
1382	for (i = 0; i < pls->n_main_streams; i++) {
1383	AVStream *st = pls->main_streams[i];
1384
1385	if (st->codecpar->codec_type != type)
1386	continue;
1387
1388	for (; rend_idx < pls->n_renditions; rend_idx++) {
1389	struct rendition *rend = pls->renditions[rend_idx];
1390
1391	if (rend->type != type)
1392	continue;
1393
1394	if (rend->language[0])
1395	av_dict_set(&st->metadata, "language", rend->language, 0);
1396	if (rend->name[0])
1397	av_dict_set(&st->metadata, "comment", rend->name, 0);
1398
1399	st->disposition |= rend->disposition;
1400	}
1401	if (rend_idx >=pls->n_renditions)
1402	break;
1403	}
1404	}
1405
1406	/* if timestamp was in valid range: returns 1 and sets seq_no
1407	* if not: returns 0 and sets seq_no to closest segment */
1408	static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
1409	int64_t timestamp, int *seq_no)
1410	{
1411	int i;
1412	int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
1413	0 : c->first_timestamp;
1414
1415	if (timestamp < pos) {
1416	*seq_no = pls->start_seq_no;
1417	return 0;
1418	}
1419
1420	for (i = 0; i < pls->n_segments; i++) {
1421	int64_t diff = pos + pls->segments[i]->duration - timestamp;
1422	if (diff > 0) {
1423	*seq_no = pls->start_seq_no + i;
1424	return 1;
1425	}
1426	pos += pls->segments[i]->duration;
1427	}
1428
1429	*seq_no = pls->start_seq_no + pls->n_segments - 1;
1430
1431	return 0;
1432	}
1433
1434	static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
1435	{
1436	int seq_no;
1437
1438	if (!pls->finished && !c->first_packet &&
1439	av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
1440	/* reload the playlist since it was suspended */
1441	parse_playlist(c, pls->url, pls, NULL);
1442
1443	/* If playback is already in progress (we are just selecting a new
1444	* playlist) and this is a complete file, find the matching segment
1445	* by counting durations. */
1446	if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
1447	find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
1448	return seq_no;
1449	}
1450
1451	if (!pls->finished) {
1452	if (!c->first_packet && /* we are doing a segment selection during playback */
1453	c->cur_seq_no >= pls->start_seq_no &&
1454	c->cur_seq_no < pls->start_seq_no + pls->n_segments)
1455	/* While spec 3.4.3 says that we cannot assume anything about the
1456	* content at the same sequence number on different playlists,
1457	* in practice this seems to work and doing it otherwise would
1458	* require us to download a segment to inspect its timestamps. */
1459	return c->cur_seq_no;
1460
1461	/* If this is a live stream, start live_start_index segments from the
1462	* start or end */
1463	if (c->live_start_index < 0)
1464	return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
1465	else
1466	return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
1467	}
1468
1469	/* Otherwise just start on the first segment. */
1470	return pls->start_seq_no;
1471	}
1472
1473	static int save_avio_options(AVFormatContext *s)
1474	{
1475	HLSContext *c = s->priv_data;
1476	static const char *opts[] = {
1477	"headers", "http_proxy", "user_agent", "user-agent", "cookies", NULL };
1478	const char **opt = opts;
1479	uint8_t *buf;
1480	int ret = 0;
1481
1482	while (*opt) {
1483	if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
1484	ret = av_dict_set(&c->avio_opts, *opt, buf,
1485	AV_DICT_DONT_STRDUP_VAL);
1486	if (ret < 0)
1487	return ret;
1488	}
1489	opt++;
1490	}
1491
1492	return ret;
1493	}
1494
1495	static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1496	int flags, AVDictionary **opts)
1497	{
1498	av_log(s, AV_LOG_ERROR,
1499	"A HLS playlist item '%s' referred to an external file '%s'. "
1500	"Opening this file was forbidden for security reasons\n",
1501	s->filename, url);
1502	return AVERROR(EPERM);
1503	}
1504
1505	static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
1506	{
1507	HLSContext *c = s->priv_data;
1508	int i, j;
1509	int bandwidth = -1;
1510
1511	for (i = 0; i < c->n_variants; i++) {
1512	struct variant *v = c->variants[i];
1513
1514	for (j = 0; j < v->n_playlists; j++) {
1515	if (v->playlists[j] != pls)
1516	continue;
1517
1518	av_program_add_stream_index(s, i, stream->index);
1519
1520	if (bandwidth < 0)
1521	bandwidth = v->bandwidth;
1522	else if (bandwidth != v->bandwidth)
1523	bandwidth = -1; /* stream in multiple variants with different bandwidths */
1524	}
1525	}
1526
1527	if (bandwidth >= 0)
1528	av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
1529	}
1530
1531	static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
1532	{
1533	int err;
1534
1535	err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
1536	if (err < 0)
1537	return err;
1538
1539	if (pls->is_id3_timestamped) /* custom timestamps via id3 */
1540	avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
1541	else
1542	avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1543
1544	st->internal->need_context_update = 1;
1545
1546	return 0;
1547	}
1548
1549	/* add new subdemuxer streams to our context, if any */
1550	static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
1551	{
1552	int err;
1553
1554	while (pls->n_main_streams < pls->ctx->nb_streams) {
1555	int ist_idx = pls->n_main_streams;
1556	AVStream *st = avformat_new_stream(s, NULL);
1557	AVStream *ist = pls->ctx->streams[ist_idx];
1558
1559	if (!st)
1560	return AVERROR(ENOMEM);
1561
1562	st->id = pls->index;
1563	dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
1564
1565	add_stream_to_programs(s, pls, st);
1566
1567	err = set_stream_info_from_input_stream(st, pls, ist);
1568	if (err < 0)
1569	return err;
1570	}
1571
1572	return 0;
1573	}
1574
1575	static void update_noheader_flag(AVFormatContext *s)
1576	{
1577	HLSContext *c = s->priv_data;
1578	int flag_needed = 0;
1579	int i;
1580
1581	for (i = 0; i < c->n_playlists; i++) {
1582	struct playlist *pls = c->playlists[i];
1583
1584	if (pls->has_noheader_flag) {
1585	flag_needed = 1;
1586	break;
1587	}
1588	}
1589
1590	if (flag_needed)
1591	s->ctx_flags |= AVFMTCTX_NOHEADER;
1592	else
1593	s->ctx_flags &= ~AVFMTCTX_NOHEADER;
1594	}
1595
1596	static int hls_close(AVFormatContext *s)
1597	{
1598	HLSContext *c = s->priv_data;
1599
1600	free_playlist_list(c);
1601	free_variant_list(c);
1602	free_rendition_list(c);
1603
1604	av_dict_free(&c->avio_opts);
1605
1606	return 0;
1607	}
1608
1609	static int hls_read_header(AVFormatContext *s)
1610	{
1611	void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
1612	HLSContext *c = s->priv_data;
1613	int ret = 0, i;
1614	int highest_cur_seq_no = 0;
1615
1616	c->ctx = s;
1617	c->interrupt_callback = &s->interrupt_callback;
1618	c->strict_std_compliance = s->strict_std_compliance;
1619
1620	c->first_packet = 1;
1621	c->first_timestamp = AV_NOPTS_VALUE;
1622	c->cur_timestamp = AV_NOPTS_VALUE;
1623
1624	if (u) {
1625	// get the previous user agent & set back to null if string size is zero
1626	update_options(&c->user_agent, "user_agent", u);
1627
1628	// get the previous cookies & set back to null if string size is zero
1629	update_options(&c->cookies, "cookies", u);
1630
1631	// get the previous headers & set back to null if string size is zero
1632	update_options(&c->headers, "headers", u);
1633
1634	// get the previous http proxt & set back to null if string size is zero
1635	update_options(&c->http_proxy, "http_proxy", u);
1636	}
1637
1638	if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
1639	goto fail;
1640
1641	if ((ret = save_avio_options(s)) < 0)
1642	goto fail;
1643
1644	/* Some HLS servers don't like being sent the range header */
1645	av_dict_set(&c->avio_opts, "seekable", "0", 0);
1646
1647	if (c->n_variants == 0) {
1648	av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1649	ret = AVERROR_EOF;
1650	goto fail;
1651	}
1652	/* If the playlist only contained playlists (Master Playlist),
1653	* parse each individual playlist. */
1654	if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
1655	for (i = 0; i < c->n_playlists; i++) {
1656	struct playlist *pls = c->playlists[i];
1657	if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
1658	goto fail;
1659	}
1660	}
1661
1662	if (c->variants[0]->playlists[0]->n_segments == 0) {
1663	av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
1664	ret = AVERROR_EOF;
1665	goto fail;
1666	}
1667
1668	/* If this isn't a live stream, calculate the total duration of the
1669	* stream. */
1670	if (c->variants[0]->playlists[0]->finished) {
1671	int64_t duration = 0;
1672	for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
1673	duration += c->variants[0]->playlists[0]->segments[i]->duration;
1674	s->duration = duration;
1675	}
1676
1677	/* Associate renditions with variants */
1678	for (i = 0; i < c->n_variants; i++) {
1679	struct variant *var = c->variants[i];
1680
1681	if (var->audio_group[0])
1682	add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
1683	if (var->video_group[0])
1684	add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
1685	if (var->subtitles_group[0])
1686	add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
1687	}
1688
1689	/* Create a program for each variant */
1690	for (i = 0; i < c->n_variants; i++) {
1691	struct variant *v = c->variants[i];
1692	AVProgram *program;
1693
1694	program = av_new_program(s, i);
1695	if (!program)
1696	goto fail;
1697	av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
1698	}
1699
1700	/* Select the starting segments */
1701	for (i = 0; i < c->n_playlists; i++) {
1702	struct playlist *pls = c->playlists[i];
1703
1704	if (pls->n_segments == 0)
1705	continue;
1706
1707	pls->cur_seq_no = select_cur_seq_no(c, pls);
1708	highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
1709	}
1710
1711	/* Open the demuxer for each playlist */
1712	for (i = 0; i < c->n_playlists; i++) {
1713	struct playlist *pls = c->playlists[i];
1714	AVInputFormat *in_fmt = NULL;
1715
1716	if (!(pls->ctx = avformat_alloc_context())) {
1717	ret = AVERROR(ENOMEM);
1718	goto fail;
1719	}
1720
1721	if (pls->n_segments == 0)
1722	continue;
1723
1724	pls->index = i;
1725	pls->needed = 1;
1726	pls->parent = s;
1727
1728	/*
1729	* If this is a live stream and this playlist looks like it is one segment
1730	* behind, try to sync it up so that every substream starts at the same
1731	* time position (so e.g. avformat_find_stream_info() will see packets from
1732	* all active streams within the first few seconds). This is not very generic,
1733	* though, as the sequence numbers are technically independent.
1734	*/
1735	if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
1736	highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
1737	pls->cur_seq_no = highest_cur_seq_no;
1738	}
1739
1740	pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1741	if (!pls->read_buffer){
1742	ret = AVERROR(ENOMEM);
1743	avformat_free_context(pls->ctx);
1744	pls->ctx = NULL;
1745	goto fail;
1746	}
1747	ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1748	read_data, NULL, NULL);
1749	pls->pb.seekable = 0;
1750	ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1751	NULL, 0, 0);
1752	if (ret < 0) {
1753	/* Free the ctx - it isn't initialized properly at this point,
1754	* so avformat_close_input shouldn't be called. If
1755	* avformat_open_input fails below, it frees and zeros the
1756	* context, so it doesn't need any special treatment like this. */
1757	av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
1758	avformat_free_context(pls->ctx);
1759	pls->ctx = NULL;
1760	goto fail;
1761	}
1762	pls->ctx->pb = &pls->pb;
1763	pls->ctx->io_open = nested_io_open;
1764	pls->ctx->flags |= s->flags;
1765
1766	if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1767	goto fail;
1768
1769	ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1770	if (ret < 0)
1771	goto fail;
1772
1773	if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
1774	ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
1775	avformat_queue_attached_pictures(pls->ctx);
1776	ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
1777	pls->id3_deferred_extra = NULL;
1778	}
1779
1780	if (pls->is_id3_timestamped == -1)
1781	av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
1782
1783	/*
1784	* For ID3 timestamped raw audio streams we need to detect the packet
1785	* durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
1786	* but for other streams we can rely on our user calling avformat_find_stream_info()
1787	* on us if they want to.
1788	*/
1789	if (pls->is_id3_timestamped) {
1790	ret = avformat_find_stream_info(pls->ctx, NULL);
1791	if (ret < 0)
1792	goto fail;
1793	}
1794
1795	pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
1796
1797	/* Create new AVStreams for each stream in this playlist */
1798	ret = update_streams_from_subdemuxer(s, pls);
1799	if (ret < 0)
1800	goto fail;
1801
1802	add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
1803	add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
1804	add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
1805	}
1806
1807	update_noheader_flag(s);
1808
1809	return 0;
1810	fail:
1811	hls_close(s);
1812	return ret;
1813	}
1814
1815	static int recheck_discard_flags(AVFormatContext *s, int first)
1816	{
1817	HLSContext *c = s->priv_data;
1818	int i, changed = 0;
1819
1820	/* Check if any new streams are needed */
1821	for (i = 0; i < c->n_playlists; i++)
1822	c->playlists[i]->cur_needed = 0;
1823
1824	for (i = 0; i < s->nb_streams; i++) {
1825	AVStream *st = s->streams[i];
1826	struct playlist *pls = c->playlists[s->streams[i]->id];
1827	if (st->discard < AVDISCARD_ALL)
1828	pls->cur_needed = 1;
1829	}
1830	for (i = 0; i < c->n_playlists; i++) {
1831	struct playlist *pls = c->playlists[i];
1832	if (pls->cur_needed && !pls->needed) {
1833	pls->needed = 1;
1834	changed = 1;
1835	pls->cur_seq_no = select_cur_seq_no(c, pls);
1836	pls->pb.eof_reached = 0;
1837	if (c->cur_timestamp != AV_NOPTS_VALUE) {
1838	/* catch up */
1839	pls->seek_timestamp = c->cur_timestamp;
1840	pls->seek_flags = AVSEEK_FLAG_ANY;
1841	pls->seek_stream_index = -1;
1842	}
1843	av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
1844	} else if (first && !pls->cur_needed && pls->needed) {
1845	if (pls->input)
1846	ff_format_io_close(pls->parent, &pls->input);
1847	pls->needed = 0;
1848	changed = 1;
1849	av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
1850	}
1851	}
1852	return changed;
1853	}
1854
1855	static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
1856	{
1857	if (pls->id3_offset >= 0) {
1858	pls->pkt.dts = pls->id3_mpegts_timestamp +
1859	av_rescale_q(pls->id3_offset,
1860	pls->ctx->streams[pls->pkt.stream_index]->time_base,
1861	MPEG_TIME_BASE_Q);
1862	if (pls->pkt.duration)
1863	pls->id3_offset += pls->pkt.duration;
1864	else
1865	pls->id3_offset = -1;
1866	} else {
1867	/* there have been packets with unknown duration
1868	* since the last id3 tag, should not normally happen */
1869	pls->pkt.dts = AV_NOPTS_VALUE;
1870	}
1871
1872	if (pls->pkt.duration)
1873	pls->pkt.duration = av_rescale_q(pls->pkt.duration,
1874	pls->ctx->streams[pls->pkt.stream_index]->time_base,
1875	MPEG_TIME_BASE_Q);
1876
1877	pls->pkt.pts = AV_NOPTS_VALUE;
1878	}
1879
1880	static AVRational get_timebase(struct playlist *pls)
1881	{
1882	if (pls->is_id3_timestamped)
1883	return MPEG_TIME_BASE_Q;
1884
1885	return pls->ctx->streams[pls->pkt.stream_index]->time_base;
1886	}
1887
1888	static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
1889	int64_t ts_b, struct playlist *pls_b)
1890	{
1891	int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
1892	int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
1893
1894	return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
1895	}
1896
1897	static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
1898	{
1899	HLSContext *c = s->priv_data;
1900	int ret, i, minplaylist = -1;
1901
1902	recheck_discard_flags(s, c->first_packet);
1903	c->first_packet = 0;
1904
1905	for (i = 0; i < c->n_playlists; i++) {
1906	struct playlist *pls = c->playlists[i];
1907	/* Make sure we've got one buffered packet from each open playlist
1908	* stream */
1909	if (pls->needed && !pls->pkt.data) {
1910	while (1) {
1911	int64_t ts_diff;
1912	AVRational tb;
1913	ret = av_read_frame(pls->ctx, &pls->pkt);
1914	if (ret < 0) {
1915	if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
1916	return ret;
1917	reset_packet(&pls->pkt);
1918	break;
1919	} else {
1920	/* stream_index check prevents matching picture attachments etc. */
1921	if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
1922	/* audio elementary streams are id3 timestamped */
1923	fill_timing_for_id3_timestamped_stream(pls);
1924	}
1925
1926	if (c->first_timestamp == AV_NOPTS_VALUE &&
1927	pls->pkt.dts != AV_NOPTS_VALUE)
1928	c->first_timestamp = av_rescale_q(pls->pkt.dts,
1929	get_timebase(pls), AV_TIME_BASE_Q);
1930	}
1931
1932	if (pls->seek_timestamp == AV_NOPTS_VALUE)
1933	break;
1934
1935	if (pls->seek_stream_index < 0 ||
1936	pls->seek_stream_index == pls->pkt.stream_index) {
1937
1938	if (pls->pkt.dts == AV_NOPTS_VALUE) {
1939	pls->seek_timestamp = AV_NOPTS_VALUE;
1940	break;
1941	}
1942
1943	tb = get_timebase(pls);
1944	ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
1945	tb.den, AV_ROUND_DOWN) -
1946	pls->seek_timestamp;
1947	if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
1948	pls->pkt.flags & AV_PKT_FLAG_KEY)) {
1949	pls->seek_timestamp = AV_NOPTS_VALUE;
1950	break;
1951	}
1952	}
1953	av_packet_unref(&pls->pkt);
1954	reset_packet(&pls->pkt);
1955	}
1956	}
1957	/* Check if this stream has the packet with the lowest dts */
1958	if (pls->pkt.data) {
1959	struct playlist *minpls = minplaylist < 0 ?
1960	NULL : c->playlists[minplaylist];
1961	if (minplaylist < 0) {
1962	minplaylist = i;
1963	} else {
1964	int64_t dts = pls->pkt.dts;
1965	int64_t mindts = minpls->pkt.dts;
1966
1967	if (dts == AV_NOPTS_VALUE ||
1968	(mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
1969	minplaylist = i;
1970	}
1971	}
1972	}
1973
1974	/* If we got a packet, return it */
1975	if (minplaylist >= 0) {
1976	struct playlist *pls = c->playlists[minplaylist];
1977	AVStream *ist;
1978	AVStream *st;
1979
1980	ret = update_streams_from_subdemuxer(s, pls);
1981	if (ret < 0) {
1982	av_packet_unref(&pls->pkt);
1983	reset_packet(&pls->pkt);
1984	return ret;
1985	}
1986
1987	/* check if noheader flag has been cleared by the subdemuxer */
1988	if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
1989	pls->has_noheader_flag = 0;
1990	update_noheader_flag(s);
1991	}
1992
1993	if (pls->pkt.stream_index >= pls->n_main_streams) {
1994	av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
1995	pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
1996	av_packet_unref(&pls->pkt);
1997	reset_packet(&pls->pkt);
1998	return AVERROR_BUG;
1999	}
2000
2001	ist = pls->ctx->streams[pls->pkt.stream_index];
2002	st = pls->main_streams[pls->pkt.stream_index];
2003
2004	*pkt = pls->pkt;
2005	pkt->stream_index = st->index;
2006	reset_packet(&c->playlists[minplaylist]->pkt);
2007
2008	if (pkt->dts != AV_NOPTS_VALUE)
2009	c->cur_timestamp = av_rescale_q(pkt->dts,
2010	ist->time_base,
2011	AV_TIME_BASE_Q);
2012
2013	/* There may be more situations where this would be useful, but this at least
2014	* handles newly probed codecs properly (i.e. request_probe by mpegts). */
2015	if (ist->codecpar->codec_id != st->codecpar->codec_id) {
2016	ret = set_stream_info_from_input_stream(st, pls, ist);
2017	if (ret < 0) {
2018	av_packet_unref(pkt);
2019	return ret;
2020	}
2021	}
2022
2023	return 0;
2024	}
2025	return AVERROR_EOF;
2026	}
2027
2028	static int hls_read_seek(AVFormatContext *s, int stream_index,
2029	int64_t timestamp, int flags)
2030	{
2031	HLSContext *c = s->priv_data;
2032	struct playlist *seek_pls = NULL;
2033	int i, seq_no;
2034	int j;
2035	int stream_subdemuxer_index;
2036	int64_t first_timestamp, seek_timestamp, duration;
2037
2038	if ((flags & AVSEEK_FLAG_BYTE) ||
2039	!(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
2040	return AVERROR(ENOSYS);
2041
2042	first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
2043	0 : c->first_timestamp;
2044
2045	seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
2046	s->streams[stream_index]->time_base.den,
2047	flags & AVSEEK_FLAG_BACKWARD ?
2048	AV_ROUND_DOWN : AV_ROUND_UP);
2049
2050	duration = s->duration == AV_NOPTS_VALUE ?
2051	0 : s->duration;
2052
2053	if (0 < duration && duration < seek_timestamp - first_timestamp)
2054	return AVERROR(EIO);
2055
2056	/* find the playlist with the specified stream */
2057	for (i = 0; i < c->n_playlists; i++) {
2058	struct playlist *pls = c->playlists[i];
2059	for (j = 0; j < pls->n_main_streams; j++) {
2060	if (pls->main_streams[j] == s->streams[stream_index]) {
2061	seek_pls = pls;
2062	stream_subdemuxer_index = j;
2063	break;
2064	}
2065	}
2066	}
2067	/* check if the timestamp is valid for the playlist with the
2068	* specified stream index */
2069	if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
2070	return AVERROR(EIO);
2071
2072	/* set segment now so we do not need to search again below */
2073	seek_pls->cur_seq_no = seq_no;
2074	seek_pls->seek_stream_index = stream_subdemuxer_index;
2075
2076	for (i = 0; i < c->n_playlists; i++) {
2077	/* Reset reading */
2078	struct playlist *pls = c->playlists[i];
2079	if (pls->input)
2080	ff_format_io_close(pls->parent, &pls->input);
2081	av_packet_unref(&pls->pkt);
2082	reset_packet(&pls->pkt);
2083	pls->pb.eof_reached = 0;
2084	/* Clear any buffered data */
2085	pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
2086	/* Reset the pos, to let the mpegts demuxer know we've seeked. */
2087	pls->pb.pos = 0;
2088	/* Flush the packet queue of the subdemuxer. */
2089	ff_read_frame_flush(pls->ctx);
2090
2091	pls->seek_timestamp = seek_timestamp;
2092	pls->seek_flags = flags;
2093
2094	if (pls != seek_pls) {
2095	/* set closest segment seq_no for playlists not handled above */
2096	find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
2097	/* seek the playlist to the given position without taking
2098	* keyframes into account since this playlist does not have the
2099	* specified stream where we should look for the keyframes */
2100	pls->seek_stream_index = -1;
2101	pls->seek_flags |= AVSEEK_FLAG_ANY;
2102	}
2103	}
2104
2105	c->cur_timestamp = seek_timestamp;
2106
2107	return 0;
2108	}
2109
2110	static int hls_probe(AVProbeData *p)
2111	{
2112	/* Require #EXTM3U at the start, and either one of the ones below
2113	* somewhere for a proper match. */
2114	if (strncmp(p->buf, "#EXTM3U", 7))
2115	return 0;
2116
2117	if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
2118	strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
2119	strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
2120	return AVPROBE_SCORE_MAX;
2121	return 0;
2122	}
2123
2124	#define OFFSET(x) offsetof(HLSContext, x)
2125	#define FLAGS AV_OPT_FLAG_DECODING_PARAM
2126	static const AVOption hls_options[] = {
2127	{"live_start_index", "segment index to start live streams at (negative values are from the end)",
2128	OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
2129	{NULL}
2130	};
2131
2132	static const AVClass hls_class = {
2133	.class_name = "hls,applehttp",
2134	.item_name = av_default_item_name,
2135	.option = hls_options,
2136	.version = LIBAVUTIL_VERSION_INT,
2137	};
2138
2139	AVInputFormat ff_hls_demuxer = {
2140	.name = "hls,applehttp",
2141	.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
2142	.priv_class = &hls_class,
2143	.priv_data_size = sizeof(HLSContext),
2144	.read_probe = hls_probe,
2145	.read_header = hls_read_header,
2146	.read_packet = hls_read_packet,
2147	.read_close = hls_close,
2148	.read_seek = hls_read_seek,
2149	};
2150