WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavformat/hls.c

Rev	Author	Line No.	Line
6147	serge	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 "url.h"
		40	#include "id3v2.h"
		41
		42	#define INITIAL_BUFFER_SIZE 32768
		43
		44	#define MAX_FIELD_LEN 64
		45	#define MAX_CHARACTERISTICS_LEN 512
		46
		47	#define MPEG_TIME_BASE 90000
		48	#define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
		49
		50	/*
		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
		56	* playlists.
		57	*
		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.
		60	*/
		61
		62	enum KeyType {
		63	KEY_NONE,
		64	KEY_AES_128,
		65	KEY_SAMPLE_AES
		66	};
		67
		68	struct segment {
		69	int64_t duration;
		70	int64_t url_offset;
		71	int64_t size;
		72	char *url;
		73	char *key;
		74	enum KeyType key_type;
		75	uint8_t iv[16];
		76	/* associated Media Initialization Section, treated as a segment */
		77	struct segment *init_section;
		78	};
		79
		80	struct rendition;
		81
		82	enum PlaylistType {
		83	PLS_TYPE_UNSPECIFIED,
		84	PLS_TYPE_EVENT,
		85	PLS_TYPE_VOD
		86	};
		87
		88	/*
		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.
		92	*/
		93	struct playlist {
		94	char url[MAX_URL_SIZE];
		95	AVIOContext pb;
		96	uint8_t* read_buffer;
		97	URLContext *input;
		98	AVFormatContext *parent;
		99	int index;
		100	AVFormatContext *ctx;
		101	AVPacket pkt;
		102	int stream_offset;
		103
		104	int finished;
		105	enum PlaylistType type;
		106	int64_t target_duration;
		107	int start_seq_no;
		108	int n_segments;
		109	struct segment **segments;
		110	int needed, cur_needed;
		111	int cur_seq_no;
		112	int64_t cur_seg_offset;
		113	int64_t last_load_time;
		114
		115	/* Currently active Media Initialization Section */
		116	struct segment *cur_init_section;
		117	uint8_t *init_sec_buf;
		118	unsigned int init_sec_buf_size;
		119	unsigned int init_sec_data_len;
		120	unsigned int init_sec_buf_read_offset;
		121
		122	char key_url[MAX_URL_SIZE];
		123	uint8_t key[16];
		124
		125	/* ID3 timestamp handling (elementary audio streams have ID3 timestamps
		126	* (and possibly other ID3 tags) in the beginning of each segment) */
		127	int is_id3_timestamped; /* -1: not yet known */
		128	int64_t id3_mpegts_timestamp; /* in mpegts tb */
		129	int64_t id3_offset; /* in stream original tb */
		130	uint8_t* id3_buf; /* temp buffer for id3 parsing */
		131	unsigned int id3_buf_size;
		132	AVDictionary id3_initial; / data from first id3 tag */
		133	int id3_found; /* ID3 tag found at some point */
		134	int id3_changed; /* ID3 tag data has changed at some point */
		135	ID3v2ExtraMeta id3_deferred_extra; / stored here until subdemuxer is opened */
		136
		137	int64_t seek_timestamp;
		138	int seek_flags;
		139	int seek_stream_index; /* into subdemuxer stream array */
		140
		141	/* Renditions associated with this playlist, if any.
		142	* Alternative rendition playlists have a single rendition associated
		143	* with them, and variant main Media Playlists may have
		144	* multiple (playlist-less) renditions associated with them. */
		145	int n_renditions;
		146	struct rendition **renditions;
		147
		148	/* Media Initialization Sections (EXT-X-MAP) associated with this
		149	* playlist, if any. */
		150	int n_init_sections;
		151	struct segment **init_sections;
		152	};
		153
		154	/*
		155	* Renditions are e.g. alternative subtitle or audio streams.
		156	* The rendition may either be an external playlist or it may be
		157	* contained in the main Media Playlist of the variant (in which case
		158	* playlist is NULL).
		159	*/
		160	struct rendition {
		161	enum AVMediaType type;
		162	struct playlist *playlist;
		163	char group_id[MAX_FIELD_LEN];
		164	char language[MAX_FIELD_LEN];
		165	char name[MAX_FIELD_LEN];
		166	int disposition;
		167	};
		168
		169	struct variant {
		170	int bandwidth;
		171
		172	/* every variant contains at least the main Media Playlist in index 0 */
		173	int n_playlists;
		174	struct playlist **playlists;
		175
		176	char audio_group[MAX_FIELD_LEN];
		177	char video_group[MAX_FIELD_LEN];
		178	char subtitles_group[MAX_FIELD_LEN];
		179	};
		180
		181	typedef struct HLSContext {
		182	AVClass *class;
		183	int n_variants;
		184	struct variant **variants;
		185	int n_playlists;
		186	struct playlist **playlists;
		187	int n_renditions;
		188	struct rendition **renditions;
		189
		190	int cur_seq_no;
		191	int live_start_index;
		192	int first_packet;
		193	int64_t first_timestamp;
		194	int64_t cur_timestamp;
		195	AVIOInterruptCB *interrupt_callback;
		196	char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
		197	char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
		198	char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context
		199	AVDictionary *avio_opts;
		200	} HLSContext;
		201
		202	static int read_chomp_line(AVIOContext s, char buf, int maxlen)
		203	{
		204	int len = ff_get_line(s, buf, maxlen);
		205	while (len > 0 && av_isspace(buf[len - 1]))
		206	buf[--len] = '\0';
		207	return len;
		208	}
		209
		210	static void free_segment_list(struct playlist *pls)
		211	{
		212	int i;
		213	for (i = 0; i < pls->n_segments; i++) {
		214	av_freep(&pls->segments[i]->key);
		215	av_freep(&pls->segments[i]->url);
		216	av_freep(&pls->segments[i]);
		217	}
		218	av_freep(&pls->segments);
		219	pls->n_segments = 0;
		220	}
		221
		222	static void free_init_section_list(struct playlist *pls)
		223	{
		224	int i;
		225	for (i = 0; i < pls->n_init_sections; i++) {
		226	av_freep(&pls->init_sections[i]->url);
		227	av_freep(&pls->init_sections[i]);
		228	}
		229	av_freep(&pls->init_sections);
		230	pls->n_init_sections = 0;
		231	}
		232
		233	static void free_playlist_list(HLSContext *c)
		234	{
		235	int i;
		236	for (i = 0; i < c->n_playlists; i++) {
		237	struct playlist *pls = c->playlists[i];
		238	free_segment_list(pls);
		239	free_init_section_list(pls);
		240	av_freep(&pls->renditions);
		241	av_freep(&pls->id3_buf);
		242	av_dict_free(&pls->id3_initial);
		243	ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
		244	av_freep(&pls->init_sec_buf);
		245	av_free_packet(&pls->pkt);
		246	av_freep(&pls->pb.buffer);
		247	if (pls->input)
		248	ffurl_close(pls->input);
		249	if (pls->ctx) {
		250	pls->ctx->pb = NULL;
		251	avformat_close_input(&pls->ctx);
		252	}
		253	av_free(pls);
		254	}
		255	av_freep(&c->playlists);
		256	av_freep(&c->cookies);
		257	av_freep(&c->user_agent);
		258	c->n_playlists = 0;
		259	}
		260
		261	static void free_variant_list(HLSContext *c)
		262	{
		263	int i;
		264	for (i = 0; i < c->n_variants; i++) {
		265	struct variant *var = c->variants[i];
		266	av_freep(&var->playlists);
		267	av_free(var);
		268	}
		269	av_freep(&c->variants);
		270	c->n_variants = 0;
		271	}
		272
		273	static void free_rendition_list(HLSContext *c)
		274	{
		275	int i;
		276	for (i = 0; i < c->n_renditions; i++)
		277	av_freep(&c->renditions[i]);
		278	av_freep(&c->renditions);
		279	c->n_renditions = 0;
		280	}
		281
		282	/*
		283	* Used to reset a statically allocated AVPacket to a clean slate,
		284	* containing no data.
		285	*/
		286	static void reset_packet(AVPacket *pkt)
		287	{
		288	av_init_packet(pkt);
		289	pkt->data = NULL;
		290	}
		291
		292	static struct playlist new_playlist(HLSContext c, const char *url,
		293	const char *base)
		294	{
		295	struct playlist *pls = av_mallocz(sizeof(struct playlist));
		296	if (!pls)
		297	return NULL;
		298	reset_packet(&pls->pkt);
		299	ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
		300	pls->seek_timestamp = AV_NOPTS_VALUE;
		301
		302	pls->is_id3_timestamped = -1;
		303	pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
		304
		305	dynarray_add(&c->playlists, &c->n_playlists, pls);
		306	return pls;
		307	}
		308
		309	struct variant_info {
		310	char bandwidth[20];
		311	/* variant group ids: */
		312	char audio[MAX_FIELD_LEN];
		313	char video[MAX_FIELD_LEN];
		314	char subtitles[MAX_FIELD_LEN];
		315	};
		316
		317	static struct variant new_variant(HLSContext c, struct variant_info *info,
		318	const char url, const char base)
		319	{
		320	struct variant *var;
		321	struct playlist *pls;
		322
		323	pls = new_playlist(c, url, base);
		324	if (!pls)
		325	return NULL;
		326
		327	var = av_mallocz(sizeof(struct variant));
		328	if (!var)
		329	return NULL;
		330
		331	if (info) {
		332	var->bandwidth = atoi(info->bandwidth);
		333	strcpy(var->audio_group, info->audio);
		334	strcpy(var->video_group, info->video);
		335	strcpy(var->subtitles_group, info->subtitles);
		336	}
		337
		338	dynarray_add(&c->variants, &c->n_variants, var);
		339	dynarray_add(&var->playlists, &var->n_playlists, pls);
		340	return var;
		341	}
		342
		343	static void handle_variant_args(struct variant_info info, const char key,
		344	int key_len, char *dest, int dest_len)
		345	{
		346	if (!strncmp(key, "BANDWIDTH=", key_len)) {
		347	*dest = info->bandwidth;
		348	*dest_len = sizeof(info->bandwidth);
		349	} else if (!strncmp(key, "AUDIO=", key_len)) {
		350	*dest = info->audio;
		351	*dest_len = sizeof(info->audio);
		352	} else if (!strncmp(key, "VIDEO=", key_len)) {
		353	*dest = info->video;
		354	*dest_len = sizeof(info->video);
		355	} else if (!strncmp(key, "SUBTITLES=", key_len)) {
		356	*dest = info->subtitles;
		357	*dest_len = sizeof(info->subtitles);
		358	}
		359	}
		360
		361	struct key_info {
		362	char uri[MAX_URL_SIZE];
		363	char method[11];
		364	char iv[35];
		365	};
		366
		367	static void handle_key_args(struct key_info info, const char key,
		368	int key_len, char *dest, int dest_len)
		369	{
		370	if (!strncmp(key, "METHOD=", key_len)) {
		371	*dest = info->method;
		372	*dest_len = sizeof(info->method);
		373	} else if (!strncmp(key, "URI=", key_len)) {
		374	*dest = info->uri;
		375	*dest_len = sizeof(info->uri);
		376	} else if (!strncmp(key, "IV=", key_len)) {
		377	*dest = info->iv;
		378	*dest_len = sizeof(info->iv);
		379	}
		380	}
		381
		382	struct init_section_info {
		383	char uri[MAX_URL_SIZE];
		384	char byterange[32];
		385	};
		386
		387	static struct segment new_init_section(struct playlist pls,
		388	struct init_section_info *info,
		389	const char *url_base)
		390	{
		391	struct segment *sec;
		392	char *ptr;
		393	char tmp_str[MAX_URL_SIZE];
		394
		395	if (!info->uri[0])
		396	return NULL;
		397
		398	sec = av_mallocz(sizeof(*sec));
		399	if (!sec)
		400	return NULL;
		401
		402	ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
		403	sec->url = av_strdup(tmp_str);
		404	if (!sec->url) {
		405	av_free(sec);
		406	return NULL;
		407	}
		408
		409	if (info->byterange[0]) {
		410	sec->size = atoi(info->byterange);
		411	ptr = strchr(info->byterange, '@');
		412	if (ptr)
		413	sec->url_offset = atoi(ptr+1);
		414	} else {
		415	/* the entire file is the init section */
		416	sec->size = -1;
		417	}
		418
		419	dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
		420
		421	return sec;
		422	}
		423
		424	static void handle_init_section_args(struct init_section_info info, const char key,
		425	int key_len, char *dest, int dest_len)
		426	{
		427	if (!strncmp(key, "URI=", key_len)) {
		428	*dest = info->uri;
		429	*dest_len = sizeof(info->uri);
		430	} else if (!strncmp(key, "BYTERANGE=", key_len)) {
		431	*dest = info->byterange;
		432	*dest_len = sizeof(info->byterange);
		433	}
		434	}
		435
		436	struct rendition_info {
		437	char type[16];
		438	char uri[MAX_URL_SIZE];
		439	char group_id[MAX_FIELD_LEN];
		440	char language[MAX_FIELD_LEN];
		441	char assoc_language[MAX_FIELD_LEN];
		442	char name[MAX_FIELD_LEN];
		443	char defaultr[4];
		444	char forced[4];
		445	char characteristics[MAX_CHARACTERISTICS_LEN];
		446	};
		447
		448	static struct rendition new_rendition(HLSContext c, struct rendition_info *info,
		449	const char *url_base)
		450	{
		451	struct rendition *rend;
		452	enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
		453	char *characteristic;
		454	char *chr_ptr;
		455	char *saveptr;
		456
		457	if (!strcmp(info->type, "AUDIO"))
		458	type = AVMEDIA_TYPE_AUDIO;
		459	else if (!strcmp(info->type, "VIDEO"))
		460	type = AVMEDIA_TYPE_VIDEO;
		461	else if (!strcmp(info->type, "SUBTITLES"))
		462	type = AVMEDIA_TYPE_SUBTITLE;
		463	else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
		464	/* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
		465	* AVC SEI RBSP anyway */
		466	return NULL;
		467
		468	if (type == AVMEDIA_TYPE_UNKNOWN)
		469	return NULL;
		470
		471	/* URI is mandatory for subtitles as per spec */
		472	if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
		473	return NULL;
		474
		475	/* TODO: handle subtitles (each segment has to parsed separately) */
		476	if (type == AVMEDIA_TYPE_SUBTITLE)
		477	return NULL;
		478
		479	rend = av_mallocz(sizeof(struct rendition));
		480	if (!rend)
		481	return NULL;
		482
		483	dynarray_add(&c->renditions, &c->n_renditions, rend);
		484
		485	rend->type = type;
		486	strcpy(rend->group_id, info->group_id);
		487	strcpy(rend->language, info->language);
		488	strcpy(rend->name, info->name);
		489
		490	/* add the playlist if this is an external rendition */
		491	if (info->uri[0]) {
		492	rend->playlist = new_playlist(c, info->uri, url_base);
		493	if (rend->playlist)
		494	dynarray_add(&rend->playlist->renditions,
		495	&rend->playlist->n_renditions, rend);
		496	}
		497
		498	if (info->assoc_language[0]) {
		499	int langlen = strlen(rend->language);
		500	if (langlen < sizeof(rend->language) - 3) {
		501	rend->language[langlen] = ',';
		502	strncpy(rend->language + langlen + 1, info->assoc_language,
		503	sizeof(rend->language) - langlen - 2);
		504	}
		505	}
		506
		507	if (!strcmp(info->defaultr, "YES"))
		508	rend->disposition \|= AV_DISPOSITION_DEFAULT;
		509	if (!strcmp(info->forced, "YES"))
		510	rend->disposition \|= AV_DISPOSITION_FORCED;
		511
		512	chr_ptr = info->characteristics;
		513	while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
		514	if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
		515	rend->disposition \|= AV_DISPOSITION_HEARING_IMPAIRED;
		516	else if (!strcmp(characteristic, "public.accessibility.describes-video"))
		517	rend->disposition \|= AV_DISPOSITION_VISUAL_IMPAIRED;
		518
		519	chr_ptr = NULL;
		520	}
		521
		522	return rend;
		523	}
		524
		525	static void handle_rendition_args(struct rendition_info info, const char key,
		526	int key_len, char *dest, int dest_len)
		527	{
		528	if (!strncmp(key, "TYPE=", key_len)) {
		529	*dest = info->type;
		530	*dest_len = sizeof(info->type);
		531	} else if (!strncmp(key, "URI=", key_len)) {
		532	*dest = info->uri;
		533	*dest_len = sizeof(info->uri);
		534	} else if (!strncmp(key, "GROUP-ID=", key_len)) {
		535	*dest = info->group_id;
		536	*dest_len = sizeof(info->group_id);
		537	} else if (!strncmp(key, "LANGUAGE=", key_len)) {
		538	*dest = info->language;
		539	*dest_len = sizeof(info->language);
		540	} else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
		541	*dest = info->assoc_language;
		542	*dest_len = sizeof(info->assoc_language);
		543	} else if (!strncmp(key, "NAME=", key_len)) {
		544	*dest = info->name;
		545	*dest_len = sizeof(info->name);
		546	} else if (!strncmp(key, "DEFAULT=", key_len)) {
		547	*dest = info->defaultr;
		548	*dest_len = sizeof(info->defaultr);
		549	} else if (!strncmp(key, "FORCED=", key_len)) {
		550	*dest = info->forced;
		551	*dest_len = sizeof(info->forced);
		552	} else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
		553	*dest = info->characteristics;
		554	*dest_len = sizeof(info->characteristics);
		555	}
		556	/*
		557	* ignored:
		558	* - AUTOSELECT: client may autoselect based on e.g. system language
		559	* - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
		560	*/
		561	}
		562
		563	/* used by parse_playlist to allocate a new variant+playlist when the
		564	* playlist is detected to be a Media Playlist (not Master Playlist)
		565	* and we have no parent Master Playlist (parsing of which would have
		566	* allocated the variant and playlist already)
		567	* *pls == NULL => Master Playlist or parentless Media Playlist
		568	* pls != NULL => parented Media Playlist, playlist+variant allocated /
		569	static int ensure_playlist(HLSContext c, struct playlist pls, const char url)
		570	{
		571	if (*pls)
		572	return 0;
		573	if (!new_variant(c, NULL, url, NULL))
		574	return AVERROR(ENOMEM);
		575	*pls = c->playlists[c->n_playlists - 1];
		576	return 0;
		577	}
		578
		579	static int open_in(HLSContext c, AVIOContext in, const char url)
		580	{
		581	AVDictionary *tmp = NULL;
		582	int ret;
		583
		584	av_dict_copy(&tmp, c->avio_opts, 0);
		585
		586	ret = avio_open2(in, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
		587
		588	av_dict_free(&tmp);
		589	return ret;
		590	}
		591
		592	static int url_connect(struct playlist pls, AVDictionary opts, AVDictionary *opts2)
		593	{
		594	AVDictionary *tmp = NULL;
		595	int ret;
		596
		597	av_dict_copy(&tmp, opts, 0);
		598	av_dict_copy(&tmp, opts2, 0);
		599
		600	if ((ret = ffurl_connect(pls->input, &tmp)) < 0) {
		601	ffurl_close(pls->input);
		602	pls->input = NULL;
		603	}
		604
		605	av_dict_free(&tmp);
		606	return ret;
		607	}
		608
		609	static void update_options(char *dest, const char name, void *src)
		610	{
		611	av_freep(dest);
		612	av_opt_get(src, name, 0, (uint8_t**)dest);
		613	if (dest && !strlen(dest))
		614	av_freep(dest);
		615	}
		616
		617	static int open_url(HLSContext c, URLContext uc, const char url, AVDictionary *opts)
		618	{
		619	AVDictionary *tmp = NULL;
		620	int ret;
		621	const char *proto_name = avio_find_protocol_name(url);
		622
		623	if (!proto_name)
		624	return AVERROR_INVALIDDATA;
		625
		626	// only http(s) & file are allowed
		627	if (!av_strstart(proto_name, "http", NULL) && !av_strstart(proto_name, "file", NULL))
		628	return AVERROR_INVALIDDATA;
		629	if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
		630	;
		631	else if (strcmp(proto_name, "file") \|\| !strncmp(url, "file,", 5))
		632	return AVERROR_INVALIDDATA;
		633
		634	av_dict_copy(&tmp, c->avio_opts, 0);
		635	av_dict_copy(&tmp, opts, 0);
		636
		637	ret = ffurl_open(uc, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
		638	if( ret >= 0) {
		639	// update cookies on http response with setcookies.
		640	URLContext u = uc;
		641	update_options(&c->cookies, "cookies", u->priv_data);
		642	av_dict_set(&opts, "cookies", c->cookies, 0);
		643	}
		644
		645	av_dict_free(&tmp);
		646
		647	return ret;
		648	}
		649
		650	static int parse_playlist(HLSContext c, const char url,
		651	struct playlist pls, AVIOContext in)
		652	{
		653	int ret = 0, is_segment = 0, is_variant = 0;
		654	int64_t duration = 0;
		655	enum KeyType key_type = KEY_NONE;
		656	uint8_t iv[16] = "";
		657	int has_iv = 0;
		658	char key[MAX_URL_SIZE] = "";
		659	char line[MAX_URL_SIZE];
		660	const char *ptr;
		661	int close_in = 0;
		662	int64_t seg_offset = 0;
		663	int64_t seg_size = -1;
		664	uint8_t *new_url = NULL;
		665	struct variant_info variant_info;
		666	char tmp_str[MAX_URL_SIZE];
		667	struct segment *cur_init_section = NULL;
		668
		669	if (!in) {
		670	#if 1
		671	AVDictionary *opts = NULL;
		672	close_in = 1;
		673	/* Some HLS servers don't like being sent the range header */
		674	av_dict_set(&opts, "seekable", "0", 0);
		675
		676	// broker prior HTTP options that should be consistent across requests
		677	av_dict_set(&opts, "user-agent", c->user_agent, 0);
		678	av_dict_set(&opts, "cookies", c->cookies, 0);
		679	av_dict_set(&opts, "headers", c->headers, 0);
		680
		681	ret = avio_open2(&in, url, AVIO_FLAG_READ,
		682	c->interrupt_callback, &opts);
		683	av_dict_free(&opts);
		684	if (ret < 0)
		685	return ret;
		686	#else
		687	ret = open_in(c, &in, url);
		688	if (ret < 0)
		689	return ret;
		690	close_in = 1;
		691	#endif
		692	}
		693
		694	if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
		695	url = new_url;
		696
		697	read_chomp_line(in, line, sizeof(line));
		698	if (strcmp(line, "#EXTM3U")) {
		699	ret = AVERROR_INVALIDDATA;
		700	goto fail;
		701	}
		702
		703	if (pls) {
		704	free_segment_list(pls);
		705	pls->finished = 0;
		706	pls->type = PLS_TYPE_UNSPECIFIED;
		707	}
		708	while (!avio_feof(in)) {
		709	read_chomp_line(in, line, sizeof(line));
		710	if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
		711	is_variant = 1;
		712	memset(&variant_info, 0, sizeof(variant_info));
		713	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
		714	&variant_info);
		715	} else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
		716	struct key_info info = {{0}};
		717	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
		718	&info);
		719	key_type = KEY_NONE;
		720	has_iv = 0;
		721	if (!strcmp(info.method, "AES-128"))
		722	key_type = KEY_AES_128;
		723	if (!strcmp(info.method, "SAMPLE-AES"))
		724	key_type = KEY_SAMPLE_AES;
		725	if (!strncmp(info.iv, "0x", 2) \|\| !strncmp(info.iv, "0X", 2)) {
		726	ff_hex_to_data(iv, info.iv + 2);
		727	has_iv = 1;
		728	}
		729	av_strlcpy(key, info.uri, sizeof(key));
		730	} else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
		731	struct rendition_info info = {{0}};
		732	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
		733	&info);
		734	new_rendition(c, &info, url);
		735	} else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
		736	ret = ensure_playlist(c, &pls, url);
		737	if (ret < 0)
		738	goto fail;
		739	pls->target_duration = atoi(ptr) * AV_TIME_BASE;
		740	} else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
		741	ret = ensure_playlist(c, &pls, url);
		742	if (ret < 0)
		743	goto fail;
		744	pls->start_seq_no = atoi(ptr);
		745	} else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
		746	ret = ensure_playlist(c, &pls, url);
		747	if (ret < 0)
		748	goto fail;
		749	if (!strcmp(ptr, "EVENT"))
		750	pls->type = PLS_TYPE_EVENT;
		751	else if (!strcmp(ptr, "VOD"))
		752	pls->type = PLS_TYPE_VOD;
		753	} else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
		754	struct init_section_info info = {{0}};
		755	ret = ensure_playlist(c, &pls, url);
		756	if (ret < 0)
		757	goto fail;
		758	ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
		759	&info);
		760	cur_init_section = new_init_section(pls, &info, url);
		761	} else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
		762	if (pls)
		763	pls->finished = 1;
		764	} else if (av_strstart(line, "#EXTINF:", &ptr)) {
		765	is_segment = 1;
		766	duration = atof(ptr) * AV_TIME_BASE;
		767	} else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
		768	seg_size = atoi(ptr);
		769	ptr = strchr(ptr, '@');
		770	if (ptr)
		771	seg_offset = atoi(ptr+1);
		772	} else if (av_strstart(line, "#", NULL)) {
		773	continue;
		774	} else if (line[0]) {
		775	if (is_variant) {
		776	if (!new_variant(c, &variant_info, line, url)) {
		777	ret = AVERROR(ENOMEM);
		778	goto fail;
		779	}
		780	is_variant = 0;
		781	}
		782	if (is_segment) {
		783	struct segment *seg;
		784	if (!pls) {
		785	if (!new_variant(c, 0, url, NULL)) {
		786	ret = AVERROR(ENOMEM);
		787	goto fail;
		788	}
		789	pls = c->playlists[c->n_playlists - 1];
		790	}
		791	seg = av_malloc(sizeof(struct segment));
		792	if (!seg) {
		793	ret = AVERROR(ENOMEM);
		794	goto fail;
		795	}
		796	seg->duration = duration;
		797	seg->key_type = key_type;
		798	if (has_iv) {
		799	memcpy(seg->iv, iv, sizeof(iv));
		800	} else {
		801	int seq = pls->start_seq_no + pls->n_segments;
		802	memset(seg->iv, 0, sizeof(seg->iv));
		803	AV_WB32(seg->iv + 12, seq);
		804	}
		805
		806	if (key_type != KEY_NONE) {
		807	ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
		808	seg->key = av_strdup(tmp_str);
		809	if (!seg->key) {
		810	av_free(seg);
		811	ret = AVERROR(ENOMEM);
		812	goto fail;
		813	}
		814	} else {
		815	seg->key = NULL;
		816	}
		817
		818	ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
		819	seg->url = av_strdup(tmp_str);
		820	if (!seg->url) {
		821	av_free(seg->key);
		822	av_free(seg);
		823	ret = AVERROR(ENOMEM);
		824	goto fail;
		825	}
		826
		827	dynarray_add(&pls->segments, &pls->n_segments, seg);
		828	is_segment = 0;
		829
		830	seg->size = seg_size;
		831	if (seg_size >= 0) {
		832	seg->url_offset = seg_offset;
		833	seg_offset += seg_size;
		834	seg_size = -1;
		835	} else {
		836	seg->url_offset = 0;
		837	seg_offset = 0;
		838	}
		839
		840	seg->init_section = cur_init_section;
		841	}
		842	}
		843	}
		844	if (pls)
		845	pls->last_load_time = av_gettime_relative();
		846
		847	fail:
		848	av_free(new_url);
		849	if (close_in)
		850	avio_close(in);
		851	return ret;
		852	}
		853
		854	static struct segment current_segment(struct playlist pls)
		855	{
		856	return pls->segments[pls->cur_seq_no - pls->start_seq_no];
		857	}
		858
		859	enum ReadFromURLMode {
		860	READ_NORMAL,
		861	READ_COMPLETE,
		862	};
		863
		864	/* read from URLContext, limiting read to current segment */
		865	static int read_from_url(struct playlist pls, struct segment seg,
		866	uint8_t *buf, int buf_size,
		867	enum ReadFromURLMode mode)
		868	{
		869	int ret;
		870
		871	/* limit read if the segment was only a part of a file */
		872	if (seg->size >= 0)
		873	buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
		874
		875	if (mode == READ_COMPLETE)
		876	ret = ffurl_read_complete(pls->input, buf, buf_size);
		877	else
		878	ret = ffurl_read(pls->input, buf, buf_size);
		879
		880	if (ret > 0)
		881	pls->cur_seg_offset += ret;
		882
		883	return ret;
		884	}
		885
		886	/* Parse the raw ID3 data and pass contents to caller */
		887	static void parse_id3(AVFormatContext s, AVIOContext pb,
		888	AVDictionary *metadata, int64_t dts,
		889	ID3v2ExtraMetaAPIC apic, ID3v2ExtraMeta extra_meta)
		890	{
		891	static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
		892	ID3v2ExtraMeta *meta;
		893
		894	ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
		895	for (meta = *extra_meta; meta; meta = meta->next) {
		896	if (!strcmp(meta->tag, "PRIV")) {
		897	ID3v2ExtraMetaPRIV *priv = meta->data;
		898	if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
		899	/* 33-bit MPEG timestamp */
		900	int64_t ts = AV_RB64(priv->data);
		901	av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
		902	if ((ts & ~((1ULL << 33) - 1)) == 0)
		903	*dts = ts;
		904	else
		905	av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
		906	}
		907	} else if (!strcmp(meta->tag, "APIC") && apic)
		908	*apic = meta->data;
		909	}
		910	}
		911
		912	/* Check if the ID3 metadata contents have changed */
		913	static int id3_has_changed_values(struct playlist pls, AVDictionary metadata,
		914	ID3v2ExtraMetaAPIC *apic)
		915	{
		916	AVDictionaryEntry *entry = NULL;
		917	AVDictionaryEntry *oldentry;
		918	/* check that no keys have changed values */
		919	while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
		920	oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
		921	if (!oldentry \|\| strcmp(oldentry->value, entry->value) != 0)
		922	return 1;
		923	}
		924
		925	/* check if apic appeared */
		926	if (apic && (pls->ctx->nb_streams != 2 \|\| !pls->ctx->streams[1]->attached_pic.data))
		927	return 1;
		928
		929	if (apic) {
		930	int size = pls->ctx->streams[1]->attached_pic.size;
		931	if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
		932	return 1;
		933
		934	if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
		935	return 1;
		936	}
		937
		938	return 0;
		939	}
		940
		941	/* Parse ID3 data and handle the found data */
		942	static void handle_id3(AVIOContext pb, struct playlist pls)
		943	{
		944	AVDictionary *metadata = NULL;
		945	ID3v2ExtraMetaAPIC *apic = NULL;
		946	ID3v2ExtraMeta *extra_meta = NULL;
		947	int64_t timestamp = AV_NOPTS_VALUE;
		948
		949	parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta);
		950
		951	if (timestamp != AV_NOPTS_VALUE) {
		952	pls->id3_mpegts_timestamp = timestamp;
		953	pls->id3_offset = 0;
		954	}
		955
		956	if (!pls->id3_found) {
		957	/* initial ID3 tags */
		958	av_assert0(!pls->id3_deferred_extra);
		959	pls->id3_found = 1;
		960
		961	/* get picture attachment and set text metadata */
		962	if (pls->ctx->nb_streams)
		963	ff_id3v2_parse_apic(pls->ctx, &extra_meta);
		964	else
		965	/* demuxer not yet opened, defer picture attachment */
		966	pls->id3_deferred_extra = extra_meta;
		967
		968	av_dict_copy(&pls->ctx->metadata, metadata, 0);
		969	pls->id3_initial = metadata;
		970
		971	} else {
		972	if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
		973	avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
		974	pls->id3_changed = 1;
		975	}
		976	av_dict_free(&metadata);
		977	}
		978
		979	if (!pls->id3_deferred_extra)
		980	ff_id3v2_free_extra_meta(&extra_meta);
		981	}
		982
		983	/* Intercept and handle ID3 tags between URLContext and AVIOContext */
		984	static void intercept_id3(struct playlist pls, uint8_t buf,
		985	int buf_size, int *len)
		986	{
		987	/* intercept id3 tags, we do not want to pass them to the raw
		988	* demuxer on all segment switches */
		989	int bytes;
		990	int id3_buf_pos = 0;
		991	int fill_buf = 0;
		992	struct segment *seg = current_segment(pls);
		993
		994	/* gather all the id3 tags */
		995	while (1) {
		996	/* see if we can retrieve enough data for ID3 header */
		997	if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
		998	bytes = read_from_url(pls, seg, buf + len, ID3v2_HEADER_SIZE - len, READ_COMPLETE);
		999	if (bytes > 0) {
		1000
		1001	if (bytes == ID3v2_HEADER_SIZE - *len)
		1002	/* no EOF yet, so fill the caller buffer again after
		1003	* we have stripped the ID3 tags */
		1004	fill_buf = 1;
		1005
		1006	*len += bytes;
		1007
		1008	} else if (*len <= 0) {
		1009	/* error/EOF */
		1010	*len = bytes;
		1011	fill_buf = 0;
		1012	}
		1013	}
		1014
		1015	if (*len < ID3v2_HEADER_SIZE)
		1016	break;
		1017
		1018	if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
		1019	int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
		1020	int taglen = ff_id3v2_tag_len(buf);
		1021	int tag_got_bytes = FFMIN(taglen, *len);
		1022	int remaining = taglen - tag_got_bytes;
		1023
		1024	if (taglen > maxsize) {
		1025	av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
		1026	taglen, maxsize);
		1027	break;
		1028	}
		1029
		1030	/*
		1031	* Copy the id3 tag to our temporary id3 buffer.
		1032	* We could read a small id3 tag directly without memcpy, but
		1033	* we would still need to copy the large tags, and handling
		1034	* both of those cases together with the possibility for multiple
		1035	* tags would make the handling a bit complex.
		1036	*/
		1037	pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
		1038	if (!pls->id3_buf)
		1039	break;
		1040	memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
		1041	id3_buf_pos += tag_got_bytes;
		1042
		1043	/* strip the intercepted bytes */
		1044	*len -= tag_got_bytes;
		1045	memmove(buf, buf + tag_got_bytes, *len);
		1046	av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
		1047
		1048	if (remaining > 0) {
		1049	/* read the rest of the tag in */
		1050	if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
		1051	break;
		1052	id3_buf_pos += remaining;
		1053	av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
		1054	}
		1055
		1056	} else {
		1057	/* no more ID3 tags */
		1058	break;
		1059	}
		1060	}
		1061
		1062	/* re-fill buffer for the caller unless EOF */
		1063	if (len >= 0 && (fill_buf \|\| len == 0)) {
		1064	bytes = read_from_url(pls, seg, buf + len, buf_size - len, READ_NORMAL);
		1065
		1066	/* ignore error if we already had some data */
		1067	if (bytes >= 0)
		1068	*len += bytes;
		1069	else if (*len == 0)
		1070	*len = bytes;
		1071	}
		1072
		1073	if (pls->id3_buf) {
		1074	/* Now parse all the ID3 tags */
		1075	AVIOContext id3ioctx;
		1076	ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
		1077	handle_id3(&id3ioctx, pls);
		1078	}
		1079
		1080	if (pls->is_id3_timestamped == -1)
		1081	pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
		1082	}
		1083
		1084	static int open_input(HLSContext c, struct playlist pls, struct segment *seg)
		1085	{
		1086	AVDictionary *opts = NULL;
		1087	int ret;
		1088
		1089	// broker prior HTTP options that should be consistent across requests
		1090	av_dict_set(&opts, "user-agent", c->user_agent, 0);
		1091	av_dict_set(&opts, "cookies", c->cookies, 0);
		1092	av_dict_set(&opts, "headers", c->headers, 0);
		1093	av_dict_set(&opts, "seekable", "0", 0);
		1094
		1095	if (seg->size >= 0) {
		1096	/* try to restrict the HTTP request to the part we want
		1097	* (if this is in fact a HTTP request) */
		1098	av_dict_set_int(&opts, "offset", seg->url_offset, 0);
		1099	av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
		1100	}
		1101
		1102	av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
		1103	seg->url, seg->url_offset, pls->index);
		1104
		1105	if (seg->key_type == KEY_NONE) {
		1106	ret = open_url(pls->parent->priv_data, &pls->input, seg->url, opts);
		1107	} else if (seg->key_type == KEY_AES_128) {
		1108	// HLSContext *c = var->parent->priv_data;
		1109	char iv[33], key[33], url[MAX_URL_SIZE];
		1110	if (strcmp(seg->key, pls->key_url)) {
		1111	URLContext *uc;
		1112	if (open_url(pls->parent->priv_data, &uc, seg->key, opts) == 0) {
		1113	if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
		1114	!= sizeof(pls->key)) {
		1115	av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
		1116	seg->key);
		1117	}
		1118	ffurl_close(uc);
		1119	} else {
		1120	av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
		1121	seg->key);
		1122	}
		1123	av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
		1124	}
		1125	ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
		1126	ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
		1127	iv[32] = key[32] = '\0';
		1128	if (strstr(seg->url, "://"))
		1129	snprintf(url, sizeof(url), "crypto+%s", seg->url);
		1130	else
		1131	snprintf(url, sizeof(url), "crypto:%s", seg->url);
		1132
		1133	if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ,
		1134	&pls->parent->interrupt_callback)) < 0)
		1135	goto cleanup;
		1136	av_opt_set(pls->input->priv_data, "key", key, 0);
		1137	av_opt_set(pls->input->priv_data, "iv", iv, 0);
		1138
		1139	if ((ret = url_connect(pls, c->avio_opts, opts)) < 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	if (ret == 0 && seg->key_type == KEY_NONE && seg->url_offset) {
		1155	int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET);
		1156	if (seekret < 0) {
		1157	av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
		1158	ret = seekret;
		1159	ffurl_close(pls->input);
		1160	pls->input = NULL;
		1161	}
		1162	}
		1163
		1164	cleanup:
		1165	av_dict_free(&opts);
		1166	pls->cur_seg_offset = 0;
		1167	return ret;
		1168	}
		1169
		1170	static int update_init_section(struct playlist pls, struct segment seg)
		1171	{
		1172	static const int max_init_section_size = 1024*1024;
		1173	HLSContext *c = pls->parent->priv_data;
		1174	int64_t sec_size;
		1175	int64_t urlsize;
		1176	int ret;
		1177
		1178	if (seg->init_section == pls->cur_init_section)
		1179	return 0;
		1180
		1181	pls->cur_init_section = NULL;
		1182
		1183	if (!seg->init_section)
		1184	return 0;
		1185
		1186	/* this will clobber playlist URLContext stuff, so this should be
		1187	* called between segments only */
		1188	ret = open_input(c, pls, seg->init_section);
		1189	if (ret < 0) {
		1190	av_log(pls->parent, AV_LOG_WARNING,
		1191	"Failed to open an initialization section in playlist %d\n",
		1192	pls->index);
		1193	return ret;
		1194	}
		1195
		1196	if (seg->init_section->size >= 0)
		1197	sec_size = seg->init_section->size;
		1198	else if ((urlsize = ffurl_size(pls->input)) >= 0)
		1199	sec_size = urlsize;
		1200	else
		1201	sec_size = max_init_section_size;
		1202
		1203	av_log(pls->parent, AV_LOG_DEBUG,
		1204	"Downloading an initialization section of size %"PRId64"\n",
		1205	sec_size);
		1206
		1207	sec_size = FFMIN(sec_size, max_init_section_size);
		1208
		1209	av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
		1210
		1211	ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
		1212	pls->init_sec_buf_size, READ_COMPLETE);
		1213	ffurl_close(pls->input);
		1214	pls->input = NULL;
		1215
		1216	if (ret < 0)
		1217	return ret;
		1218
		1219	pls->cur_init_section = seg->init_section;
		1220	pls->init_sec_data_len = ret;
		1221	pls->init_sec_buf_read_offset = 0;
		1222
		1223	/* spec says audio elementary streams do not have media initialization
		1224	* sections, so there should be no ID3 timestamps */
		1225	pls->is_id3_timestamped = 0;
		1226
		1227	return 0;
		1228	}
		1229
		1230	static int64_t default_reload_interval(struct playlist *pls)
		1231	{
		1232	return pls->n_segments > 0 ?
		1233	pls->segments[pls->n_segments - 1]->duration :
		1234	pls->target_duration;
		1235	}
		1236
		1237	static int read_data(void opaque, uint8_t buf, int buf_size)
		1238	{
		1239	struct playlist *v = opaque;
		1240	HLSContext *c = v->parent->priv_data;
		1241	int ret, i;
		1242	int just_opened = 0;
		1243
		1244	restart:
		1245	if (!v->needed)
		1246	return AVERROR_EOF;
		1247
		1248	if (!v->input) {
		1249	int64_t reload_interval;
		1250	struct segment *seg;
		1251
		1252	/* Check that the playlist is still needed before opening a new
		1253	* segment. */
		1254	if (v->ctx && v->ctx->nb_streams &&
		1255	v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
		1256	v->needed = 0;
		1257	for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
		1258	i++) {
		1259	if (v->parent->streams[i]->discard < AVDISCARD_ALL)
		1260	v->needed = 1;
		1261	}
		1262	}
		1263	if (!v->needed) {
		1264	av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
		1265	v->index);
		1266	return AVERROR_EOF;
		1267	}
		1268
		1269	/* If this is a live stream and the reload interval has elapsed since
		1270	* the last playlist reload, reload the playlists now. */
		1271	reload_interval = default_reload_interval(v);
		1272
		1273	reload:
		1274	if (!v->finished &&
		1275	av_gettime_relative() - v->last_load_time >= reload_interval) {
		1276	if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
		1277	av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
		1278	v->index);
		1279	return ret;
		1280	}
		1281	/* If we need to reload the playlist again below (if
		1282	* there's still no more segments), switch to a reload
		1283	* interval of half the target duration. */
		1284	reload_interval = v->target_duration / 2;
		1285	}
		1286	if (v->cur_seq_no < v->start_seq_no) {
		1287	av_log(NULL, AV_LOG_WARNING,
		1288	"skipping %d segments ahead, expired from playlists\n",
		1289	v->start_seq_no - v->cur_seq_no);
		1290	v->cur_seq_no = v->start_seq_no;
		1291	}
		1292	if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
		1293	if (v->finished)
		1294	return AVERROR_EOF;
		1295	while (av_gettime_relative() - v->last_load_time < reload_interval) {
		1296	if (ff_check_interrupt(c->interrupt_callback))
		1297	return AVERROR_EXIT;
		1298	av_usleep(100*1000);
		1299	}
		1300	/* Enough time has elapsed since the last reload */
		1301	goto reload;
		1302	}
		1303
		1304	seg = current_segment(v);
		1305
		1306	/* load/update Media Initialization Section, if any */
		1307	ret = update_init_section(v, seg);
		1308	if (ret)
		1309	return ret;
		1310
		1311	ret = open_input(c, v, seg);
		1312	if (ret < 0) {
		1313	if (ff_check_interrupt(c->interrupt_callback))
		1314	return AVERROR_EXIT;
		1315	av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
		1316	v->index);
		1317	v->cur_seq_no += 1;
		1318	goto reload;
		1319	}
		1320	just_opened = 1;
		1321	}
		1322
		1323	if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
		1324	/* Push init section out first before first actual segment */
		1325	int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
		1326	memcpy(buf, v->init_sec_buf, copy_size);
		1327	v->init_sec_buf_read_offset += copy_size;
		1328	return copy_size;
		1329	}
		1330
		1331	ret = read_from_url(v, current_segment(v), buf, buf_size, READ_NORMAL);
		1332	if (ret > 0) {
		1333	if (just_opened && v->is_id3_timestamped != 0) {
		1334	/* Intercept ID3 tags here, elementary audio streams are required
		1335	* to convey timestamps using them in the beginning of each segment. */
		1336	intercept_id3(v, buf, buf_size, &ret);
		1337	}
		1338
		1339	return ret;
		1340	}
		1341	ffurl_close(v->input);
		1342	v->input = NULL;
		1343	v->cur_seq_no++;
		1344
		1345	c->cur_seq_no = v->cur_seq_no;
		1346
		1347	goto restart;
		1348	}
		1349
		1350	static int playlist_in_multiple_variants(HLSContext c, struct playlist pls)
		1351	{
		1352	int variant_count = 0;
		1353	int i, j;
		1354
		1355	for (i = 0; i < c->n_variants && variant_count < 2; i++) {
		1356	struct variant *v = c->variants[i];
		1357
		1358	for (j = 0; j < v->n_playlists; j++) {
		1359	if (v->playlists[j] == pls) {
		1360	variant_count++;
		1361	break;
		1362	}
		1363	}
		1364	}
		1365
		1366	return variant_count >= 2;
		1367	}
		1368
		1369	static void add_renditions_to_variant(HLSContext c, struct variant var,
		1370	enum AVMediaType type, const char *group_id)
		1371	{
		1372	int i;
		1373
		1374	for (i = 0; i < c->n_renditions; i++) {
		1375	struct rendition *rend = c->renditions[i];
		1376
		1377	if (rend->type == type && !strcmp(rend->group_id, group_id)) {
		1378
		1379	if (rend->playlist)
		1380	/* rendition is an external playlist
		1381	* => add the playlist to the variant */
		1382	dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
		1383	else
		1384	/* rendition is part of the variant main Media Playlist
		1385	* => add the rendition to the main Media Playlist */
		1386	dynarray_add(&var->playlists[0]->renditions,
		1387	&var->playlists[0]->n_renditions,
		1388	rend);
		1389	}
		1390	}
		1391	}
		1392
		1393	static void add_metadata_from_renditions(AVFormatContext s, struct playlist pls,
		1394	enum AVMediaType type)
		1395	{
		1396	int rend_idx = 0;
		1397	int i;
		1398
		1399	for (i = 0; i < pls->ctx->nb_streams; i++) {
		1400	AVStream *st = s->streams[pls->stream_offset + i];
		1401
		1402	if (st->codec->codec_type != type)
		1403	continue;
		1404
		1405	for (; rend_idx < pls->n_renditions; rend_idx++) {
		1406	struct rendition *rend = pls->renditions[rend_idx];
		1407
		1408	if (rend->type != type)
		1409	continue;
		1410
		1411	if (rend->language[0])
		1412	av_dict_set(&st->metadata, "language", rend->language, 0);
		1413	if (rend->name[0])
		1414	av_dict_set(&st->metadata, "comment", rend->name, 0);
		1415
		1416	st->disposition \|= rend->disposition;
		1417	}
		1418	if (rend_idx >=pls->n_renditions)
		1419	break;
		1420	}
		1421	}
		1422
		1423	/* if timestamp was in valid range: returns 1 and sets seq_no
		1424	* if not: returns 0 and sets seq_no to closest segment */
		1425	static int find_timestamp_in_playlist(HLSContext c, struct playlist pls,
		1426	int64_t timestamp, int *seq_no)
		1427	{
		1428	int i;
		1429	int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
		1430
		1431
		1432	if (timestamp < pos) {
		1433	*seq_no = pls->start_seq_no;
		1434	return 0;
		1435	}
		1436
		1437	for (i = 0; i < pls->n_segments; i++) {
		1438	int64_t diff = pos + pls->segments[i]->duration - timestamp;
		1439	if (diff > 0) {
		1440	*seq_no = pls->start_seq_no + i;
		1441	return 1;
		1442	}
		1443	pos += pls->segments[i]->duration;
		1444	}
		1445
		1446	*seq_no = pls->start_seq_no + pls->n_segments - 1;
		1447
		1448	return 0;
		1449	}
		1450
		1451	static int select_cur_seq_no(HLSContext c, struct playlist pls)
		1452	{
		1453	int seq_no;
		1454
		1455	if (!pls->finished && !c->first_packet &&
		1456	av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
		1457	/* reload the playlist since it was suspended */
		1458	parse_playlist(c, pls->url, pls, NULL);
		1459
		1460	/* If playback is already in progress (we are just selecting a new
		1461	* playlist) and this is a complete file, find the matching segment
		1462	* by counting durations. */
		1463	if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
		1464	find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
		1465	return seq_no;
		1466	}
		1467
		1468	if (!pls->finished) {
		1469	if (!c->first_packet && /* we are doing a segment selection during playback */
		1470	c->cur_seq_no >= pls->start_seq_no &&
		1471	c->cur_seq_no < pls->start_seq_no + pls->n_segments)
		1472	/* While spec 3.4.3 says that we cannot assume anything about the
		1473	* content at the same sequence number on different playlists,
		1474	* in practice this seems to work and doing it otherwise would
		1475	* require us to download a segment to inspect its timestamps. */
		1476	return c->cur_seq_no;
		1477
		1478	/* If this is a live stream, start live_start_index segments from the
		1479	* start or end */
		1480	if (c->live_start_index < 0)
		1481	return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
		1482	else
		1483	return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
		1484	}
		1485
		1486	/* Otherwise just start on the first segment. */
		1487	return pls->start_seq_no;
		1488	}
		1489
		1490	static int save_avio_options(AVFormatContext *s)
		1491	{
		1492	HLSContext *c = s->priv_data;
		1493	const char opts[] = { "headers", "user_agent", "user-agent", "cookies", NULL }, *opt = opts;
		1494	uint8_t *buf;
		1495	int ret = 0;
		1496
		1497	while (*opt) {
		1498	if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
		1499	ret = av_dict_set(&c->avio_opts, *opt, buf,
		1500	AV_DICT_DONT_STRDUP_VAL);
		1501	if (ret < 0)
		1502	return ret;
		1503	}
		1504	opt++;
		1505	}
		1506
		1507	return ret;
		1508	}
		1509
		1510	static int hls_read_header(AVFormatContext *s)
		1511	{
		1512	URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
		1513	HLSContext *c = s->priv_data;
		1514	int ret = 0, i, j, stream_offset = 0;
		1515
		1516	c->interrupt_callback = &s->interrupt_callback;
		1517
		1518	c->first_packet = 1;
		1519	c->first_timestamp = AV_NOPTS_VALUE;
		1520	c->cur_timestamp = AV_NOPTS_VALUE;
		1521
		1522	// if the URL context is good, read important options we must broker later
		1523	if (u && u->prot->priv_data_class) {
		1524	// get the previous user agent & set back to null if string size is zero
		1525	update_options(&c->user_agent, "user-agent", u->priv_data);
		1526
		1527	// get the previous cookies & set back to null if string size is zero
		1528	update_options(&c->cookies, "cookies", u->priv_data);
		1529
		1530	// get the previous headers & set back to null if string size is zero
		1531	update_options(&c->headers, "headers", u->priv_data);
		1532	}
		1533
		1534	if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
		1535	goto fail;
		1536
		1537	if ((ret = save_avio_options(s)) < 0)
		1538	goto fail;
		1539
		1540	/* Some HLS servers don't like being sent the range header */
		1541	av_dict_set(&c->avio_opts, "seekable", "0", 0);
		1542
		1543	if (c->n_variants == 0) {
		1544	av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
		1545	ret = AVERROR_EOF;
		1546	goto fail;
		1547	}
		1548	/* If the playlist only contained playlists (Master Playlist),
		1549	* parse each individual playlist. */
		1550	if (c->n_playlists > 1 \|\| c->playlists[0]->n_segments == 0) {
		1551	for (i = 0; i < c->n_playlists; i++) {
		1552	struct playlist *pls = c->playlists[i];
		1553	if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
		1554	goto fail;
		1555	}
		1556	}
		1557
		1558	if (c->variants[0]->playlists[0]->n_segments == 0) {
		1559	av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
		1560	ret = AVERROR_EOF;
		1561	goto fail;
		1562	}
		1563
		1564	/* If this isn't a live stream, calculate the total duration of the
		1565	* stream. */
		1566	if (c->variants[0]->playlists[0]->finished) {
		1567	int64_t duration = 0;
		1568	for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
		1569	duration += c->variants[0]->playlists[0]->segments[i]->duration;
		1570	s->duration = duration;
		1571	}
		1572
		1573	/* Associate renditions with variants */
		1574	for (i = 0; i < c->n_variants; i++) {
		1575	struct variant *var = c->variants[i];
		1576
		1577	if (var->audio_group[0])
		1578	add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
		1579	if (var->video_group[0])
		1580	add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
		1581	if (var->subtitles_group[0])
		1582	add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
		1583	}
		1584
		1585	/* Open the demuxer for each playlist */
		1586	for (i = 0; i < c->n_playlists; i++) {
		1587	struct playlist *pls = c->playlists[i];
		1588	AVInputFormat *in_fmt = NULL;
		1589
		1590	if (!(pls->ctx = avformat_alloc_context())) {
		1591	ret = AVERROR(ENOMEM);
		1592	goto fail;
		1593	}
		1594
		1595	if (pls->n_segments == 0)
		1596	continue;
		1597
		1598	pls->index = i;
		1599	pls->needed = 1;
		1600	pls->parent = s;
		1601	pls->cur_seq_no = select_cur_seq_no(c, pls);
		1602
		1603	pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
		1604	if (!pls->read_buffer){
		1605	ret = AVERROR(ENOMEM);
		1606	avformat_free_context(pls->ctx);
		1607	pls->ctx = NULL;
		1608	goto fail;
		1609	}
		1610	ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
		1611	read_data, NULL, NULL);
		1612	pls->pb.seekable = 0;
		1613	ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
		1614	NULL, 0, 0);
		1615	if (ret < 0) {
		1616	/* Free the ctx - it isn't initialized properly at this point,
		1617	* so avformat_close_input shouldn't be called. If
		1618	* avformat_open_input fails below, it frees and zeros the
		1619	* context, so it doesn't need any special treatment like this. */
		1620	av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
		1621	avformat_free_context(pls->ctx);
		1622	pls->ctx = NULL;
		1623	goto fail;
		1624	}
		1625	pls->ctx->pb = &pls->pb;
		1626	pls->stream_offset = stream_offset;
		1627
		1628	if ((ret = ff_copy_whitelists(pls->ctx, s)) < 0)
		1629	goto fail;
		1630
		1631	ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
		1632	if (ret < 0)
		1633	goto fail;
		1634
		1635	if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
		1636	ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
		1637	avformat_queue_attached_pictures(pls->ctx);
		1638	ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
		1639	pls->id3_deferred_extra = NULL;
		1640	}
		1641
		1642	pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
		1643	ret = avformat_find_stream_info(pls->ctx, NULL);
		1644	if (ret < 0)
		1645	goto fail;
		1646
		1647	if (pls->is_id3_timestamped == -1)
		1648	av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
		1649
		1650	/* Create new AVStreams for each stream in this playlist */
		1651	for (j = 0; j < pls->ctx->nb_streams; j++) {
		1652	AVStream *st = avformat_new_stream(s, NULL);
		1653	AVStream *ist = pls->ctx->streams[j];
		1654	if (!st) {
		1655	ret = AVERROR(ENOMEM);
		1656	goto fail;
		1657	}
		1658	st->id = i;
		1659
		1660	avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
		1661
		1662	if (pls->is_id3_timestamped) /* custom timestamps via id3 */
		1663	avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
		1664	else
		1665	avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
		1666	}
		1667
		1668	add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
		1669	add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
		1670	add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
		1671
		1672	stream_offset += pls->ctx->nb_streams;
		1673	}
		1674
		1675	/* Create a program for each variant */
		1676	for (i = 0; i < c->n_variants; i++) {
		1677	struct variant *v = c->variants[i];
		1678	AVProgram *program;
		1679
		1680	program = av_new_program(s, i);
		1681	if (!program)
		1682	goto fail;
		1683	av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
		1684
		1685	for (j = 0; j < v->n_playlists; j++) {
		1686	struct playlist *pls = v->playlists[j];
		1687	int is_shared = playlist_in_multiple_variants(c, pls);
		1688	int k;
		1689
		1690	for (k = 0; k < pls->ctx->nb_streams; k++) {
		1691	struct AVStream *st = s->streams[pls->stream_offset + k];
		1692
		1693	ff_program_add_stream_index(s, i, pls->stream_offset + k);
		1694
		1695	/* Set variant_bitrate for streams unique to this variant */
		1696	if (!is_shared && v->bandwidth)
		1697	av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0);
		1698	}
		1699	}
		1700	}
		1701
		1702	return 0;
		1703	fail:
		1704	free_playlist_list(c);
		1705	free_variant_list(c);
		1706	free_rendition_list(c);
		1707	return ret;
		1708	}
		1709
		1710	static int recheck_discard_flags(AVFormatContext *s, int first)
		1711	{
		1712	HLSContext *c = s->priv_data;
		1713	int i, changed = 0;
		1714
		1715	/* Check if any new streams are needed */
		1716	for (i = 0; i < c->n_playlists; i++)
		1717	c->playlists[i]->cur_needed = 0;
		1718
		1719	for (i = 0; i < s->nb_streams; i++) {
		1720	AVStream *st = s->streams[i];
		1721	struct playlist *pls = c->playlists[s->streams[i]->id];
		1722	if (st->discard < AVDISCARD_ALL)
		1723	pls->cur_needed = 1;
		1724	}
		1725	for (i = 0; i < c->n_playlists; i++) {
		1726	struct playlist *pls = c->playlists[i];
		1727	if (pls->cur_needed && !pls->needed) {
		1728	pls->needed = 1;
		1729	changed = 1;
		1730	pls->cur_seq_no = select_cur_seq_no(c, pls);
		1731	pls->pb.eof_reached = 0;
		1732	if (c->cur_timestamp != AV_NOPTS_VALUE) {
		1733	/* catch up */
		1734	pls->seek_timestamp = c->cur_timestamp;
		1735	pls->seek_flags = AVSEEK_FLAG_ANY;
		1736	pls->seek_stream_index = -1;
		1737	}
		1738	av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
		1739	} else if (first && !pls->cur_needed && pls->needed) {
		1740	if (pls->input)
		1741	ffurl_close(pls->input);
		1742	pls->input = NULL;
		1743	pls->needed = 0;
		1744	changed = 1;
		1745	av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
		1746	}
		1747	}
		1748	return changed;
		1749	}
		1750
		1751	static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
		1752	{
		1753	if (pls->id3_offset >= 0) {
		1754	pls->pkt.dts = pls->id3_mpegts_timestamp +
		1755	av_rescale_q(pls->id3_offset,
		1756	pls->ctx->streams[pls->pkt.stream_index]->time_base,
		1757	MPEG_TIME_BASE_Q);
		1758	if (pls->pkt.duration)
		1759	pls->id3_offset += pls->pkt.duration;
		1760	else
		1761	pls->id3_offset = -1;
		1762	} else {
		1763	/* there have been packets with unknown duration
		1764	* since the last id3 tag, should not normally happen */
		1765	pls->pkt.dts = AV_NOPTS_VALUE;
		1766	}
		1767
		1768	if (pls->pkt.duration)
		1769	pls->pkt.duration = av_rescale_q(pls->pkt.duration,
		1770	pls->ctx->streams[pls->pkt.stream_index]->time_base,
		1771	MPEG_TIME_BASE_Q);
		1772
		1773	pls->pkt.pts = AV_NOPTS_VALUE;
		1774	}
		1775
		1776	static AVRational get_timebase(struct playlist *pls)
		1777	{
		1778	if (pls->is_id3_timestamped)
		1779	return MPEG_TIME_BASE_Q;
		1780
		1781	return pls->ctx->streams[pls->pkt.stream_index]->time_base;
		1782	}
		1783
		1784	static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
		1785	int64_t ts_b, struct playlist *pls_b)
		1786	{
		1787	int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
		1788	int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
		1789
		1790	return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
		1791	}
		1792
		1793	static int hls_read_packet(AVFormatContext s, AVPacket pkt)
		1794	{
		1795	HLSContext *c = s->priv_data;
		1796	int ret, i, minplaylist = -1;
		1797
		1798	recheck_discard_flags(s, c->first_packet);
		1799	c->first_packet = 0;
		1800
		1801	for (i = 0; i < c->n_playlists; i++) {
		1802	struct playlist *pls = c->playlists[i];
		1803	/* Make sure we've got one buffered packet from each open playlist
		1804	* stream */
		1805	if (pls->needed && !pls->pkt.data) {
		1806	while (1) {
		1807	int64_t ts_diff;
		1808	AVRational tb;
		1809	ret = av_read_frame(pls->ctx, &pls->pkt);
		1810	if (ret < 0) {
		1811	if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
		1812	return ret;
		1813	reset_packet(&pls->pkt);
		1814	break;
		1815	} else {
		1816	/* stream_index check prevents matching picture attachments etc. */
		1817	if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
		1818	/* audio elementary streams are id3 timestamped */
		1819	fill_timing_for_id3_timestamped_stream(pls);
		1820	}
		1821
		1822	if (c->first_timestamp == AV_NOPTS_VALUE &&
		1823	pls->pkt.dts != AV_NOPTS_VALUE)
		1824	c->first_timestamp = av_rescale_q(pls->pkt.dts,
		1825	get_timebase(pls), AV_TIME_BASE_Q);
		1826	}
		1827
		1828	if (pls->seek_timestamp == AV_NOPTS_VALUE)
		1829	break;
		1830
		1831	if (pls->seek_stream_index < 0 \|\|
		1832	pls->seek_stream_index == pls->pkt.stream_index) {
		1833
		1834	if (pls->pkt.dts == AV_NOPTS_VALUE) {
		1835	pls->seek_timestamp = AV_NOPTS_VALUE;
		1836	break;
		1837	}
		1838
		1839	tb = get_timebase(pls);
		1840	ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
		1841	tb.den, AV_ROUND_DOWN) -
		1842	pls->seek_timestamp;
		1843	if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY \|\|
		1844	pls->pkt.flags & AV_PKT_FLAG_KEY)) {
		1845	pls->seek_timestamp = AV_NOPTS_VALUE;
		1846	break;
		1847	}
		1848	}
		1849	av_free_packet(&pls->pkt);
		1850	reset_packet(&pls->pkt);
		1851	}
		1852	}
		1853	/* Check if this stream has the packet with the lowest dts */
		1854	if (pls->pkt.data) {
		1855	struct playlist *minpls = minplaylist < 0 ?
		1856	NULL : c->playlists[minplaylist];
		1857	if (minplaylist < 0) {
		1858	minplaylist = i;
		1859	} else {
		1860	int64_t dts = pls->pkt.dts;
		1861	int64_t mindts = minpls->pkt.dts;
		1862
		1863	if (dts == AV_NOPTS_VALUE \|\|
		1864	(mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
		1865	minplaylist = i;
		1866	}
		1867	}
		1868	}
		1869
		1870	/* If we got a packet, return it */
		1871	if (minplaylist >= 0) {
		1872	struct playlist *pls = c->playlists[minplaylist];
		1873	*pkt = pls->pkt;
		1874	pkt->stream_index += pls->stream_offset;
		1875	reset_packet(&c->playlists[minplaylist]->pkt);
		1876
		1877	if (pkt->dts != AV_NOPTS_VALUE)
		1878	c->cur_timestamp = av_rescale_q(pkt->dts,
		1879	pls->ctx->streams[pls->pkt.stream_index]->time_base,
		1880	AV_TIME_BASE_Q);
		1881
		1882	return 0;
		1883	}
		1884	return AVERROR_EOF;
		1885	}
		1886
		1887	static int hls_close(AVFormatContext *s)
		1888	{
		1889	HLSContext *c = s->priv_data;
		1890
		1891	free_playlist_list(c);
		1892	free_variant_list(c);
		1893	free_rendition_list(c);
		1894
		1895	av_dict_free(&c->avio_opts);
		1896
		1897	return 0;
		1898	}
		1899
		1900	static int hls_read_seek(AVFormatContext *s, int stream_index,
		1901	int64_t timestamp, int flags)
		1902	{
		1903	HLSContext *c = s->priv_data;
		1904	struct playlist *seek_pls = NULL;
		1905	int i, seq_no;
		1906	int64_t first_timestamp, seek_timestamp, duration;
		1907
		1908	if ((flags & AVSEEK_FLAG_BYTE) \|\|
		1909	!(c->variants[0]->playlists[0]->finished \|\| c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
		1910	return AVERROR(ENOSYS);
		1911
		1912	first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
		1913
		1914
		1915	seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
		1916	s->streams[stream_index]->time_base.den,
		1917	flags & AVSEEK_FLAG_BACKWARD ?
		1918	AV_ROUND_DOWN : AV_ROUND_UP);
		1919
		1920	duration = s->duration == AV_NOPTS_VALUE ?
		1921
		1922
		1923	if (0 < duration && duration < seek_timestamp - first_timestamp)
		1924	return AVERROR(EIO);
		1925
		1926	/* find the playlist with the specified stream */
		1927	for (i = 0; i < c->n_playlists; i++) {
		1928	struct playlist *pls = c->playlists[i];
		1929	if (stream_index >= pls->stream_offset &&
		1930	stream_index - pls->stream_offset < pls->ctx->nb_streams) {
		1931	seek_pls = pls;
		1932	break;
		1933	}
		1934	}
		1935	/* check if the timestamp is valid for the playlist with the
		1936	* specified stream index */
		1937	if (!seek_pls \|\| !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
		1938	return AVERROR(EIO);
		1939
		1940	/* set segment now so we do not need to search again below */
		1941	seek_pls->cur_seq_no = seq_no;
		1942	seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset;
		1943
		1944	for (i = 0; i < c->n_playlists; i++) {
		1945	/* Reset reading */
		1946	struct playlist *pls = c->playlists[i];
		1947	if (pls->input) {
		1948	ffurl_close(pls->input);
		1949	pls->input = NULL;
		1950	}
		1951	av_free_packet(&pls->pkt);
		1952	reset_packet(&pls->pkt);
		1953	pls->pb.eof_reached = 0;
		1954	/* Clear any buffered data */
		1955	pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
		1956	/* Reset the pos, to let the mpegts demuxer know we've seeked. */
		1957	pls->pb.pos = 0;
		1958	/* Flush the packet queue of the subdemuxer. */
		1959	ff_read_frame_flush(pls->ctx);
		1960
		1961	pls->seek_timestamp = seek_timestamp;
		1962	pls->seek_flags = flags;
		1963
		1964	if (pls != seek_pls) {
		1965	/* set closest segment seq_no for playlists not handled above */
		1966	find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
		1967	/* seek the playlist to the given position without taking
		1968	* keyframes into account since this playlist does not have the
		1969	* specified stream where we should look for the keyframes */
		1970	pls->seek_stream_index = -1;
		1971	pls->seek_flags \|= AVSEEK_FLAG_ANY;
		1972	}
		1973	}
		1974
		1975	c->cur_timestamp = seek_timestamp;
		1976
		1977	return 0;
		1978	}
		1979
		1980	static int hls_probe(AVProbeData *p)
		1981	{
		1982	/* Require #EXTM3U at the start, and either one of the ones below
		1983	* somewhere for a proper match. */
		1984	if (strncmp(p->buf, "#EXTM3U", 7))
		1985	return 0;
		1986	if (strstr(p->buf, "#EXT-X-STREAM-INF:") \|\|
		1987	strstr(p->buf, "#EXT-X-TARGETDURATION:") \|\|
		1988	strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
		1989	return AVPROBE_SCORE_MAX;
		1990	return 0;
		1991	}
		1992
		1993	#define OFFSET(x) offsetof(HLSContext, x)
		1994	#define FLAGS AV_OPT_FLAG_DECODING_PARAM
		1995	static const AVOption hls_options[] = {
		1996	{"live_start_index", "segment index to start live streams at (negative values are from the end)",
		1997	OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
		1998	{NULL}
		1999	};
		2000
		2001	static const AVClass hls_class = {
		2002	.class_name = "hls,applehttp",
		2003	.item_name = av_default_item_name,
		2004	.option = hls_options,
		2005	.version = LIBAVUTIL_VERSION_INT,
		2006	};
		2007
		2008	AVInputFormat ff_hls_demuxer = {
		2009	.name = "hls,applehttp",
		2010	.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
		2011	.priv_class = &hls_class,
		2012	.priv_data_size = sizeof(HLSContext),
		2013	.read_probe = hls_probe,
		2014	.read_header = hls_read_header,
		2015	.read_packet = hls_read_packet,
		2016	.read_close = hls_close,
		2017	.read_seek = hls_read_seek,
		2018	};

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(root)/contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavformat/hls.c @ 7195 – Rev 6147