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FFmpeg/libavformat/hls.c
vectronic 7f51cf75c6 avformat/hls: improve comment 
Signed-off-by: vectronic <hello.vectronic@gmail.com>
2024-11-10 11:20:08 +08:00

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/*
* Apple HTTP Live Streaming demuxer
* Copyright (c) 2010 Martin Storsjo
* Copyright (c) 2013 Anssi Hannula
* Copyright (c) 2021 Nachiket Tarate
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Apple HTTP Live Streaming demuxer
* https://www.rfc-editor.org/rfc/rfc8216.txt
*/
#include "config_components.h"
#include "libavformat/http.h"
#include "libavutil/aes.h"
#include "libavutil/avstring.h"
#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/time.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "avio_internal.h"
#include "id3v2.h"
#include "url.h"
#include "hls_sample_encryption.h"
#define INITIAL_BUFFER_SIZE 32768
#define MAX_FIELD_LEN 64
#define MAX_CHARACTERISTICS_LEN 512
#define MPEG_TIME_BASE 90000
#define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
/*
* An apple http stream consists of a playlist with media segment files,
* played sequentially. There may be several playlists with the same
* video content, in different bandwidth variants, that are played in
* parallel (preferably only one bandwidth variant at a time). In this case,
* the user supplied the url to a main playlist that only lists the variant
* playlists.
*
* If the main playlist doesn't point at any variants, we still create
* one anonymous toplevel variant for this, to maintain the structure.
*/
enum KeyType {
KEY_NONE,
KEY_AES_128,
KEY_SAMPLE_AES
};
struct segment {
int64_t duration;
int64_t url_offset;
int64_t size;
char *url;
char *key;
enum KeyType key_type;
uint8_t iv[16];
/* associated Media Initialization Section, treated as a segment */
struct segment *init_section;
};
struct rendition;
enum PlaylistType {
PLS_TYPE_UNSPECIFIED,
PLS_TYPE_EVENT,
PLS_TYPE_VOD
};
/*
* Each playlist has its own demuxer. If it currently is active,
* it has an open AVIOContext too, and potentially an AVPacket
* containing the next packet from this stream.
*/
struct playlist {
char url[MAX_URL_SIZE];
FFIOContext pb;
uint8_t* read_buffer;
AVIOContext *input;
int input_read_done;
AVIOContext *input_next;
int input_next_requested;
AVFormatContext *parent;
int index;
AVFormatContext *ctx;
AVPacket *pkt;
int has_noheader_flag;
/* main demuxer streams associated with this playlist
* indexed by the subdemuxer stream indexes */
AVStream **main_streams;
int n_main_streams;
int finished;
enum PlaylistType type;
int64_t target_duration;
int64_t start_seq_no;
int time_offset_flag;
int64_t start_time_offset;
int n_segments;
struct segment **segments;
int needed;
int broken;
int64_t cur_seq_no;
int64_t last_seq_no;
int m3u8_hold_counters;
int64_t cur_seg_offset;
int64_t last_load_time;
/* Currently active Media Initialization Section */
struct segment *cur_init_section;
uint8_t *init_sec_buf;
unsigned int init_sec_buf_size;
unsigned int init_sec_data_len;
unsigned int init_sec_buf_read_offset;
char key_url[MAX_URL_SIZE];
uint8_t key[16];
/* ID3 timestamp handling (elementary audio streams have ID3 timestamps
* (and possibly other ID3 tags) in the beginning of each segment) */
int is_id3_timestamped; /* -1: not yet known */
int64_t id3_mpegts_timestamp; /* in mpegts tb */
int64_t id3_offset; /* in stream original tb */
uint8_t* id3_buf; /* temp buffer for id3 parsing */
unsigned int id3_buf_size;
AVDictionary *id3_initial; /* data from first id3 tag */
int id3_found; /* ID3 tag found at some point */
int id3_changed; /* ID3 tag data has changed at some point */
ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
HLSAudioSetupInfo audio_setup_info;
int64_t seek_timestamp;
int seek_flags;
int seek_stream_index; /* into subdemuxer stream array */
/* Renditions associated with this playlist, if any.
* Alternative rendition playlists have a single rendition associated
* with them, and variant main Media Playlists may have
* multiple (playlist-less) renditions associated with them. */
int n_renditions;
struct rendition **renditions;
/* Media Initialization Sections (EXT-X-MAP) associated with this
* playlist, if any. */
int n_init_sections;
struct segment **init_sections;
};
/*
* Renditions are e.g. alternative subtitle or audio streams.
* The rendition may either be an external playlist or it may be
* contained in the main Media Playlist of the variant (in which case
* playlist is NULL).
*/
struct rendition {
enum AVMediaType type;
struct playlist *playlist;
char group_id[MAX_FIELD_LEN];
char language[MAX_FIELD_LEN];
char name[MAX_FIELD_LEN];
int disposition;
};
struct variant {
int bandwidth;
/* every variant contains at least the main Media Playlist in index 0 */
int n_playlists;
struct playlist **playlists;
char audio_group[MAX_FIELD_LEN];
char video_group[MAX_FIELD_LEN];
char subtitles_group[MAX_FIELD_LEN];
};
typedef struct HLSContext {
AVClass *class;
AVFormatContext *ctx;
int n_variants;
struct variant **variants;
int n_playlists;
struct playlist **playlists;
int n_renditions;
struct rendition **renditions;
int64_t cur_seq_no;
int m3u8_hold_counters;
int live_start_index;
int prefer_x_start;
int first_packet;
int64_t first_timestamp;
int64_t cur_timestamp;
AVIOInterruptCB *interrupt_callback;
AVDictionary *avio_opts;
AVDictionary *seg_format_opts;
char *allowed_extensions;
int max_reload;
int http_persistent;
int http_multiple;
int http_seekable;
int seg_max_retry;
AVIOContext *playlist_pb;
HLSCryptoContext crypto_ctx;
} HLSContext;
static void free_segment_dynarray(struct segment **segments, int n_segments)
{
int i;
for (i = 0; i < n_segments; i++) {
av_freep(&segments[i]->key);
av_freep(&segments[i]->url);
av_freep(&segments[i]);
}
}
static void free_segment_list(struct playlist *pls)
{
free_segment_dynarray(pls->segments, pls->n_segments);
av_freep(&pls->segments);
pls->n_segments = 0;
}
static void free_init_section_list(struct playlist *pls)
{
int i;
for (i = 0; i < pls->n_init_sections; i++) {
av_freep(&pls->init_sections[i]->key);
av_freep(&pls->init_sections[i]->url);
av_freep(&pls->init_sections[i]);
}
av_freep(&pls->init_sections);
pls->n_init_sections = 0;
}
static void free_playlist_list(HLSContext *c)
{
int i;
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
free_segment_list(pls);
free_init_section_list(pls);
av_freep(&pls->main_streams);
av_freep(&pls->renditions);
av_freep(&pls->id3_buf);
av_dict_free(&pls->id3_initial);
ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
av_freep(&pls->init_sec_buf);
av_packet_free(&pls->pkt);
av_freep(&pls->pb.pub.buffer);
ff_format_io_close(c->ctx, &pls->input);
pls->input_read_done = 0;
ff_format_io_close(c->ctx, &pls->input_next);
pls->input_next_requested = 0;
if (pls->ctx) {
pls->ctx->pb = NULL;
avformat_close_input(&pls->ctx);
}
av_free(pls);
}
av_freep(&c->playlists);
c->n_playlists = 0;
}
static void free_variant_list(HLSContext *c)
{
int i;
for (i = 0; i < c->n_variants; i++) {
struct variant *var = c->variants[i];
av_freep(&var->playlists);
av_free(var);
}
av_freep(&c->variants);
c->n_variants = 0;
}
static void free_rendition_list(HLSContext *c)
{
int i;
for (i = 0; i < c->n_renditions; i++)
av_freep(&c->renditions[i]);
av_freep(&c->renditions);
c->n_renditions = 0;
}
static struct playlist *new_playlist(HLSContext *c, const char *url,
const char *base)
{
struct playlist *pls = av_mallocz(sizeof(struct playlist));
if (!pls)
return NULL;
pls->pkt = av_packet_alloc();
if (!pls->pkt) {
av_free(pls);
return NULL;
}
ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
if (!pls->url[0]) {
av_packet_free(&pls->pkt);
av_free(pls);
return NULL;
}
pls->seek_timestamp = AV_NOPTS_VALUE;
pls->is_id3_timestamped = -1;
pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
dynarray_add(&c->playlists, &c->n_playlists, pls);
return pls;
}
struct variant_info {
char bandwidth[20];
/* variant group ids: */
char audio[MAX_FIELD_LEN];
char video[MAX_FIELD_LEN];
char subtitles[MAX_FIELD_LEN];
};
static struct variant *new_variant(HLSContext *c, struct variant_info *info,
const char *url, const char *base)
{
struct variant *var;
struct playlist *pls;
pls = new_playlist(c, url, base);
if (!pls)
return NULL;
var = av_mallocz(sizeof(struct variant));
if (!var)
return NULL;
if (info) {
var->bandwidth = atoi(info->bandwidth);
strcpy(var->audio_group, info->audio);
strcpy(var->video_group, info->video);
strcpy(var->subtitles_group, info->subtitles);
}
dynarray_add(&c->variants, &c->n_variants, var);
dynarray_add(&var->playlists, &var->n_playlists, pls);
return var;
}
static void handle_variant_args(struct variant_info *info, const char *key,
int key_len, char **dest, int *dest_len)
{
if (!strncmp(key, "BANDWIDTH=", key_len)) {
*dest = info->bandwidth;
*dest_len = sizeof(info->bandwidth);
} else if (!strncmp(key, "AUDIO=", key_len)) {
*dest = info->audio;
*dest_len = sizeof(info->audio);
} else if (!strncmp(key, "VIDEO=", key_len)) {
*dest = info->video;
*dest_len = sizeof(info->video);
} else if (!strncmp(key, "SUBTITLES=", key_len)) {
*dest = info->subtitles;
*dest_len = sizeof(info->subtitles);
}
}
struct key_info {
char uri[MAX_URL_SIZE];
char method[11];
char iv[35];
};
static void handle_key_args(struct key_info *info, const char *key,
int key_len, char **dest, int *dest_len)
{
if (!strncmp(key, "METHOD=", key_len)) {
*dest = info->method;
*dest_len = sizeof(info->method);
} else if (!strncmp(key, "URI=", key_len)) {
*dest = info->uri;
*dest_len = sizeof(info->uri);
} else if (!strncmp(key, "IV=", key_len)) {
*dest = info->iv;
*dest_len = sizeof(info->iv);
}
}
struct init_section_info {
char uri[MAX_URL_SIZE];
char byterange[32];
};
static struct segment *new_init_section(struct playlist *pls,
struct init_section_info *info,
const char *url_base)
{
struct segment *sec;
char tmp_str[MAX_URL_SIZE], *ptr = tmp_str;
if (!info->uri[0])
return NULL;
sec = av_mallocz(sizeof(*sec));
if (!sec)
return NULL;
if (!av_strncasecmp(info->uri, "data:", 5)) {
ptr = info->uri;
} else {
ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
if (!tmp_str[0]) {
av_free(sec);
return NULL;
}
}
sec->url = av_strdup(ptr);
if (!sec->url) {
av_free(sec);
return NULL;
}
if (info->byterange[0]) {
sec->size = strtoll(info->byterange, NULL, 10);
ptr = strchr(info->byterange, '@');
if (ptr)
sec->url_offset = strtoll(ptr+1, NULL, 10);
} else {
/* the entire file is the init section */
sec->size = -1;
}
dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
return sec;
}
static void handle_init_section_args(struct init_section_info *info, const char *key,
int key_len, char **dest, int *dest_len)
{
if (!strncmp(key, "URI=", key_len)) {
*dest = info->uri;
*dest_len = sizeof(info->uri);
} else if (!strncmp(key, "BYTERANGE=", key_len)) {
*dest = info->byterange;
*dest_len = sizeof(info->byterange);
}
}
struct rendition_info {
char type[16];
char uri[MAX_URL_SIZE];
char group_id[MAX_FIELD_LEN];
char language[MAX_FIELD_LEN];
char assoc_language[MAX_FIELD_LEN];
char name[MAX_FIELD_LEN];
char defaultr[4];
char forced[4];
char characteristics[MAX_CHARACTERISTICS_LEN];
};
static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
const char *url_base)
{
struct rendition *rend;
enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
char *characteristic;
char *chr_ptr;
char *saveptr;
if (!strcmp(info->type, "AUDIO"))
type = AVMEDIA_TYPE_AUDIO;
else if (!strcmp(info->type, "VIDEO"))
type = AVMEDIA_TYPE_VIDEO;
else if (!strcmp(info->type, "SUBTITLES"))
type = AVMEDIA_TYPE_SUBTITLE;
else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
/* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
* AVC SEI RBSP anyway */
return NULL;
if (type == AVMEDIA_TYPE_UNKNOWN) {
av_log(c->ctx, AV_LOG_WARNING, "Can't support the type: %s\n", info->type);
return NULL;
}
/* URI is mandatory for subtitles as per spec */
if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) {
av_log(c->ctx, AV_LOG_ERROR, "The URI tag is REQUIRED for subtitle.\n");
return NULL;
}
/* TODO: handle subtitles (each segment has to parsed separately) */
if (c->ctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
if (type == AVMEDIA_TYPE_SUBTITLE) {
av_log(c->ctx, AV_LOG_WARNING, "Can't support the subtitle(uri: %s)\n", info->uri);
return NULL;
}
rend = av_mallocz(sizeof(struct rendition));
if (!rend)
return NULL;
dynarray_add(&c->renditions, &c->n_renditions, rend);
rend->type = type;
strcpy(rend->group_id, info->group_id);
strcpy(rend->language, info->language);
strcpy(rend->name, info->name);
/* add the playlist if this is an external rendition */
if (info->uri[0]) {
rend->playlist = new_playlist(c, info->uri, url_base);
if (rend->playlist)
dynarray_add(&rend->playlist->renditions,
&rend->playlist->n_renditions, rend);
}
if (info->assoc_language[0]) {
size_t langlen = strlen(rend->language);
if (langlen < sizeof(rend->language) - 3) {
size_t assoc_len;
rend->language[langlen] = ',';
assoc_len = av_strlcpy(rend->language + langlen + 1,
info->assoc_language,
sizeof(rend->language) - langlen - 1);
if (langlen + assoc_len + 2 > sizeof(rend->language)) // truncation occurred
av_log(c->ctx, AV_LOG_WARNING, "Truncated rendition language: %s\n",
info->assoc_language);
}
}
if (!strcmp(info->defaultr, "YES"))
rend->disposition |= AV_DISPOSITION_DEFAULT;
if (!strcmp(info->forced, "YES"))
rend->disposition |= AV_DISPOSITION_FORCED;
chr_ptr = info->characteristics;
while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
else if (!strcmp(characteristic, "public.accessibility.describes-video"))
rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
chr_ptr = NULL;
}
return rend;
}
static void handle_rendition_args(struct rendition_info *info, const char *key,
int key_len, char **dest, int *dest_len)
{
if (!strncmp(key, "TYPE=", key_len)) {
*dest = info->type;
*dest_len = sizeof(info->type);
} else if (!strncmp(key, "URI=", key_len)) {
*dest = info->uri;
*dest_len = sizeof(info->uri);
} else if (!strncmp(key, "GROUP-ID=", key_len)) {
*dest = info->group_id;
*dest_len = sizeof(info->group_id);
} else if (!strncmp(key, "LANGUAGE=", key_len)) {
*dest = info->language;
*dest_len = sizeof(info->language);
} else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
*dest = info->assoc_language;
*dest_len = sizeof(info->assoc_language);
} else if (!strncmp(key, "NAME=", key_len)) {
*dest = info->name;
*dest_len = sizeof(info->name);
} else if (!strncmp(key, "DEFAULT=", key_len)) {
*dest = info->defaultr;
*dest_len = sizeof(info->defaultr);
} else if (!strncmp(key, "FORCED=", key_len)) {
*dest = info->forced;
*dest_len = sizeof(info->forced);
} else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
*dest = info->characteristics;
*dest_len = sizeof(info->characteristics);
}
/*
* ignored:
* - AUTOSELECT: client may autoselect based on e.g. system language
* - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
*/
}
/* used by parse_playlist to allocate a new variant+playlist when the
* playlist is detected to be a Media Playlist (not Master Playlist)
* and we have no parent Master Playlist (parsing of which would have
* allocated the variant and playlist already)
* *pls == NULL => Master Playlist or parentless Media Playlist
* *pls != NULL => parented Media Playlist, playlist+variant allocated */
static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
{
if (*pls)
return 0;
if (!new_variant(c, NULL, url, NULL))
return AVERROR(ENOMEM);
*pls = c->playlists[c->n_playlists - 1];
return 0;
}
static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb,
const char *url, AVDictionary **options)
{
#if !CONFIG_HTTP_PROTOCOL
return AVERROR_PROTOCOL_NOT_FOUND;
#else
int ret;
URLContext *uc = ffio_geturlcontext(*pb);
av_assert0(uc);
(*pb)->eof_reached = 0;
ret = ff_http_do_new_request2(uc, url, options);
if (ret < 0) {
ff_format_io_close(s, pb);
}
return ret;
#endif
}
static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
AVDictionary **opts, AVDictionary *opts2, int *is_http_out)
{
HLSContext *c = s->priv_data;
AVDictionary *tmp = NULL;
const char *proto_name = NULL;
int ret;
int is_http = 0;
if (av_strstart(url, "crypto", NULL)) {
if (url[6] == '+' || url[6] == ':')
proto_name = avio_find_protocol_name(url + 7);
} else if (av_strstart(url, "data", NULL)) {
if (url[4] == '+' || url[4] == ':')
proto_name = avio_find_protocol_name(url + 5);
}
if (!proto_name)
proto_name = avio_find_protocol_name(url);
if (!proto_name)
return AVERROR_INVALIDDATA;
// only http(s) & file are allowed
if (av_strstart(proto_name, "file", NULL)) {
if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
av_log(s, AV_LOG_ERROR,
"Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
"If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
url);
return AVERROR_INVALIDDATA;
}
} else if (av_strstart(proto_name, "http", NULL)) {
is_http = 1;
} else if (av_strstart(proto_name, "data", NULL)) {
;
} else
return AVERROR_INVALIDDATA;
if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
;
else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
;
else if (av_strstart(url, "data", NULL) && !strncmp(proto_name, url + 5, strlen(proto_name)) && url[5 + strlen(proto_name)] == ':')
;
else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
return AVERROR_INVALIDDATA;
av_dict_copy(&tmp, *opts, 0);
av_dict_copy(&tmp, opts2, 0);
if (is_http && c->http_persistent && *pb) {
ret = open_url_keepalive(c->ctx, pb, url, &tmp);
if (ret == AVERROR_EXIT) {
av_dict_free(&tmp);
return ret;
} else if (ret < 0) {
if (ret != AVERROR_EOF)
av_log(s, AV_LOG_WARNING,
"keepalive request failed for '%s' with error: '%s' when opening url, retrying with new connection\n",
url, av_err2str(ret));
av_dict_copy(&tmp, *opts, 0);
av_dict_copy(&tmp, opts2, 0);
ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
}
} else {
ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
}
if (ret >= 0) {
// update cookies on http response with setcookies.
char *new_cookies = NULL;
if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
if (new_cookies)
av_dict_set(opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
}
av_dict_free(&tmp);
if (is_http_out)
*is_http_out = is_http;
return ret;
}
static int parse_playlist(HLSContext *c, const char *url,
struct playlist *pls, AVIOContext *in)
{
int ret = 0, is_segment = 0, is_variant = 0;
int64_t duration = 0;
enum KeyType key_type = KEY_NONE;
uint8_t iv[16] = "";
int has_iv = 0;
char key[MAX_URL_SIZE] = "";
char line[MAX_URL_SIZE];
const char *ptr;
int close_in = 0;
int64_t seg_offset = 0;
int64_t seg_size = -1;
uint8_t *new_url = NULL;
struct variant_info variant_info;
char tmp_str[MAX_URL_SIZE];
struct segment *cur_init_section = NULL;
int is_http = av_strstart(url, "http", NULL);
struct segment **prev_segments = NULL;
int prev_n_segments = 0;
int64_t prev_start_seq_no = -1;
if (is_http && !in && c->http_persistent && c->playlist_pb) {
in = c->playlist_pb;
ret = open_url_keepalive(c->ctx, &c->playlist_pb, url, NULL);
if (ret == AVERROR_EXIT) {
return ret;
} else if (ret < 0) {
if (ret != AVERROR_EOF)
av_log(c->ctx, AV_LOG_WARNING,
"keepalive request failed for '%s' with error: '%s' when parsing playlist\n",
url, av_err2str(ret));
in = NULL;
}
}
if (!in) {
AVDictionary *opts = NULL;
av_dict_copy(&opts, c->avio_opts, 0);
if (c->http_persistent)
av_dict_set(&opts, "multiple_requests", "1", 0);
ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
av_dict_free(&opts);
if (ret < 0)
return ret;
if (is_http && c->http_persistent)
c->playlist_pb = in;
else
close_in = 1;
}
if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
url = new_url;
ff_get_chomp_line(in, line, sizeof(line));
if (strcmp(line, "#EXTM3U")) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (pls) {
prev_start_seq_no = pls->start_seq_no;
prev_segments = pls->segments;
prev_n_segments = pls->n_segments;
pls->segments = NULL;
pls->n_segments = 0;
pls->finished = 0;
pls->type = PLS_TYPE_UNSPECIFIED;
}
while (!avio_feof(in)) {
ff_get_chomp_line(in, line, sizeof(line));
if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
is_variant = 1;
memset(&variant_info, 0, sizeof(variant_info));
ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
&variant_info);
} else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
struct key_info info = {{0}};
ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
&info);
key_type = KEY_NONE;
has_iv = 0;
if (!strcmp(info.method, "AES-128"))
key_type = KEY_AES_128;
if (!strcmp(info.method, "SAMPLE-AES"))
key_type = KEY_SAMPLE_AES;
if (!av_strncasecmp(info.iv, "0x", 2)) {
ff_hex_to_data(iv, info.iv + 2);
has_iv = 1;
}
av_strlcpy(key, info.uri, sizeof(key));
} else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
struct rendition_info info = {{0}};
ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
&info);
new_rendition(c, &info, url);
} else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
int64_t t;
ret = ensure_playlist(c, &pls, url);
if (ret < 0)
goto fail;
t = strtoll(ptr, NULL, 10);
if (t < 0 || t >= INT64_MAX / AV_TIME_BASE) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
pls->target_duration = t * AV_TIME_BASE;
} else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
uint64_t seq_no;
ret = ensure_playlist(c, &pls, url);
if (ret < 0)
goto fail;
seq_no = strtoull(ptr, NULL, 10);
if (seq_no > INT64_MAX/2) {
av_log(c->ctx, AV_LOG_DEBUG, "MEDIA-SEQUENCE higher than "
"INT64_MAX/2, mask out the highest bit\n");
seq_no &= INT64_MAX/2;
}
pls->start_seq_no = seq_no;
} else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
ret = ensure_playlist(c, &pls, url);
if (ret < 0)
goto fail;
if (!strcmp(ptr, "EVENT"))
pls->type = PLS_TYPE_EVENT;
else if (!strcmp(ptr, "VOD"))
pls->type = PLS_TYPE_VOD;
} else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
struct init_section_info info = {{0}};
ret = ensure_playlist(c, &pls, url);
if (ret < 0)
goto fail;
ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
&info);
cur_init_section = new_init_section(pls, &info, url);
if (!cur_init_section) {
ret = AVERROR(ENOMEM);
goto fail;
}
cur_init_section->key_type = key_type;
if (has_iv) {
memcpy(cur_init_section->iv, iv, sizeof(iv));
} else {
int64_t seq = pls->start_seq_no + pls->n_segments;
memset(cur_init_section->iv, 0, sizeof(cur_init_section->iv));
AV_WB64(cur_init_section->iv + 8, seq);
}
if (key_type != KEY_NONE) {
ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
if (!tmp_str[0]) {
av_free(cur_init_section);
ret = AVERROR_INVALIDDATA;
goto fail;
}
cur_init_section->key = av_strdup(tmp_str);
if (!cur_init_section->key) {
av_free(cur_init_section);
ret = AVERROR(ENOMEM);
goto fail;
}
} else {
cur_init_section->key = NULL;
}
} else if (av_strstart(line, "#EXT-X-START:", &ptr)) {
const char *time_offset_value = NULL;
ret = ensure_playlist(c, &pls, url);
if (ret < 0) {
goto fail;
}
if (av_strstart(ptr, "TIME-OFFSET=", &time_offset_value)) {
float offset = strtof(time_offset_value, NULL);
pls->start_time_offset = offset * AV_TIME_BASE;
pls->time_offset_flag = 1;
} else {
av_log(c->ctx, AV_LOG_WARNING, "#EXT-X-START value is"
"invalid, it will be ignored");
continue;
}
} else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
if (pls)
pls->finished = 1;
} else if (av_strstart(line, "#EXTINF:", &ptr)) {
is_segment = 1;
duration = atof(ptr) * AV_TIME_BASE;
} else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
seg_size = strtoll(ptr, NULL, 10);
ptr = strchr(ptr, '@');
if (ptr)
seg_offset = strtoll(ptr+1, NULL, 10);
} else if (av_strstart(line, "#", NULL)) {
av_log(c->ctx, AV_LOG_INFO, "Skip ('%s')\n", line);
continue;
} else if (line[0]) {
if (is_variant) {
if (!new_variant(c, &variant_info, line, url)) {
ret = AVERROR(ENOMEM);
goto fail;
}
is_variant = 0;
}
if (is_segment) {
struct segment *seg;
ret = ensure_playlist(c, &pls, url);
if (ret < 0)
goto fail;
seg = av_malloc(sizeof(struct segment));
if (!seg) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (has_iv) {
memcpy(seg->iv, iv, sizeof(iv));
} else {
uint64_t seq = pls->start_seq_no + (uint64_t)pls->n_segments;
memset(seg->iv, 0, sizeof(seg->iv));
AV_WB64(seg->iv + 8, seq);
}
if (key_type != KEY_NONE) {
ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
if (!tmp_str[0]) {
ret = AVERROR_INVALIDDATA;
av_free(seg);
goto fail;
}
seg->key = av_strdup(tmp_str);
if (!seg->key) {
av_free(seg);
ret = AVERROR(ENOMEM);
goto fail;
}
} else {
seg->key = NULL;
}
ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
if (!tmp_str[0]) {
ret = AVERROR_INVALIDDATA;
if (seg->key)
av_free(seg->key);
av_free(seg);
goto fail;
}
seg->url = av_strdup(tmp_str);
if (!seg->url) {
av_free(seg->key);
av_free(seg);
ret = AVERROR(ENOMEM);
goto fail;
}
if (duration < 0.001 * AV_TIME_BASE) {
av_log(c->ctx, AV_LOG_WARNING, "Cannot get correct #EXTINF value of segment %s,"
" set to default value to 1ms.\n", seg->url);
duration = 0.001 * AV_TIME_BASE;
}
seg->duration = duration;
seg->key_type = key_type;
dynarray_add(&pls->segments, &pls->n_segments, seg);
is_segment = 0;
seg->size = seg_size;
if (seg_size >= 0) {
seg->url_offset = seg_offset;
seg_offset += seg_size;
seg_size = -1;
} else {
seg->url_offset = 0;
seg_offset = 0;
}
seg->init_section = cur_init_section;
}
}
}
if (prev_segments) {
if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
int64_t prev_timestamp = c->first_timestamp;
int i;
int64_t diff = pls->start_seq_no - prev_start_seq_no;
for (i = 0; i < prev_n_segments && i < diff; i++) {
c->first_timestamp += prev_segments[i]->duration;
}
av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%"PRId64" -> %"PRId64")"
" reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
prev_start_seq_no, pls->start_seq_no,
prev_timestamp, c->first_timestamp);
} else if (pls->start_seq_no < prev_start_seq_no) {
av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %"PRId64" -> %"PRId64"\n",
prev_start_seq_no, pls->start_seq_no);
}
free_segment_dynarray(prev_segments, prev_n_segments);
av_freep(&prev_segments);
}
if (pls)
pls->last_load_time = av_gettime_relative();
fail:
av_free(new_url);
if (close_in)
ff_format_io_close(c->ctx, &in);
c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
if (!c->n_variants || !c->variants[0]->n_playlists ||
!(c->variants[0]->playlists[0]->finished ||
c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
c->ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
return ret;
}
static struct segment *current_segment(struct playlist *pls)
{
int64_t n = pls->cur_seq_no - pls->start_seq_no;
if (n >= pls->n_segments)
return NULL;
return pls->segments[n];
}
static struct segment *next_segment(struct playlist *pls)
{
int64_t n = pls->cur_seq_no - pls->start_seq_no + 1;
if (n >= pls->n_segments)
return NULL;
return pls->segments[n];
}
static int read_from_url(struct playlist *pls, struct segment *seg,
uint8_t *buf, int buf_size)
{
int ret;
/* limit read if the segment was only a part of a file */
if (seg->size >= 0)
buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
ret = avio_read(pls->input, buf, buf_size);
if (ret > 0)
pls->cur_seg_offset += ret;
return ret;
}
/* Parse the raw ID3 data and pass contents to caller */
static void parse_id3(AVFormatContext *s, AVIOContext *pb,
AVDictionary **metadata, int64_t *dts, HLSAudioSetupInfo *audio_setup_info,
ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
{
static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
static const char id3_priv_owner_audio_setup[] = "com.apple.streaming.audioDescription";
ID3v2ExtraMeta *meta;
ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
for (meta = *extra_meta; meta; meta = meta->next) {
if (!strcmp(meta->tag, "PRIV")) {
ID3v2ExtraMetaPRIV *priv = &meta->data.priv;
if (priv->datasize == 8 && !av_strncasecmp(priv->owner, id3_priv_owner_ts, 44)) {
/* 33-bit MPEG timestamp */
int64_t ts = AV_RB64(priv->data);
av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
if ((ts & ~((1ULL << 33) - 1)) == 0)
*dts = ts;
else
av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
} else if (priv->datasize >= 8 && !av_strncasecmp(priv->owner, id3_priv_owner_audio_setup, 36)) {
ff_hls_senc_read_audio_setup_info(audio_setup_info, priv->data, priv->datasize);
}
} else if (!strcmp(meta->tag, "APIC") && apic)
*apic = &meta->data.apic;
}
}
/* Check if the ID3 metadata contents have changed */
static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
ID3v2ExtraMetaAPIC *apic)
{
const AVDictionaryEntry *entry = NULL;
const AVDictionaryEntry *oldentry;
/* check that no keys have changed values */
while ((entry = av_dict_iterate(metadata, entry))) {
oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
return 1;
}
/* check if apic appeared */
if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
return 1;
if (apic) {
int size = pls->ctx->streams[1]->attached_pic.size;
if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
return 1;
if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
return 1;
}
return 0;
}
/* Parse ID3 data and handle the found data */
static void handle_id3(AVIOContext *pb, struct playlist *pls)
{
AVDictionary *metadata = NULL;
ID3v2ExtraMetaAPIC *apic = NULL;
ID3v2ExtraMeta *extra_meta = NULL;
int64_t timestamp = AV_NOPTS_VALUE;
parse_id3(pls->ctx, pb, &metadata, &timestamp, &pls->audio_setup_info, &apic, &extra_meta);
if (timestamp != AV_NOPTS_VALUE) {
pls->id3_mpegts_timestamp = timestamp;
pls->id3_offset = 0;
}
if (!pls->id3_found) {
/* initial ID3 tags */
av_assert0(!pls->id3_deferred_extra);
pls->id3_found = 1;
/* get picture attachment and set text metadata */
if (pls->ctx->nb_streams)
ff_id3v2_parse_apic(pls->ctx, extra_meta);
else
/* demuxer not yet opened, defer picture attachment */
pls->id3_deferred_extra = extra_meta;
ff_id3v2_parse_priv_dict(&metadata, extra_meta);
av_dict_copy(&pls->ctx->metadata, metadata, 0);
pls->id3_initial = metadata;
} else {
if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
avpriv_report_missing_feature(pls->parent, "Changing ID3 metadata in HLS audio elementary stream");
pls->id3_changed = 1;
}
av_dict_free(&metadata);
}
if (!pls->id3_deferred_extra)
ff_id3v2_free_extra_meta(&extra_meta);
}
static void intercept_id3(struct playlist *pls, uint8_t *buf,
int buf_size, int *len)
{
/* intercept id3 tags, we do not want to pass them to the raw
* demuxer on all segment switches */
int bytes;
int id3_buf_pos = 0;
int fill_buf = 0;
struct segment *seg = current_segment(pls);
/* gather all the id3 tags */
while (1) {
/* see if we can retrieve enough data for ID3 header */
if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
if (bytes > 0) {
if (bytes == ID3v2_HEADER_SIZE - *len)
/* no EOF yet, so fill the caller buffer again after
* we have stripped the ID3 tags */
fill_buf = 1;
*len += bytes;
} else if (*len <= 0) {
/* error/EOF */
*len = bytes;
fill_buf = 0;
}
}
if (*len < ID3v2_HEADER_SIZE)
break;
if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
int taglen = ff_id3v2_tag_len(buf);
int tag_got_bytes = FFMIN(taglen, *len);
int remaining = taglen - tag_got_bytes;
if (taglen > maxsize) {
av_log(pls->parent, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
taglen, maxsize);
break;
}
/*
* Copy the id3 tag to our temporary id3 buffer.
* We could read a small id3 tag directly without memcpy, but
* we would still need to copy the large tags, and handling
* both of those cases together with the possibility for multiple
* tags would make the handling a bit complex.
*/
pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
if (!pls->id3_buf)
break;
memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
id3_buf_pos += tag_got_bytes;
/* strip the intercepted bytes */
*len -= tag_got_bytes;
memmove(buf, buf + tag_got_bytes, *len);
av_log(pls->parent, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
if (remaining > 0) {
/* read the rest of the tag in */
if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
break;
id3_buf_pos += remaining;
av_log(pls->parent, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
}
} else {
/* no more ID3 tags */
break;
}
}
/* re-fill buffer for the caller unless EOF */
if (*len >= 0 && (fill_buf || *len == 0)) {
bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
/* ignore error if we already had some data */
if (bytes >= 0)
*len += bytes;
else if (*len == 0)
*len = bytes;
}
if (pls->id3_buf) {
/* Now parse all the ID3 tags */
FFIOContext id3ioctx;
ffio_init_read_context(&id3ioctx, pls->id3_buf, id3_buf_pos);
handle_id3(&id3ioctx.pub, pls);
}
if (pls->is_id3_timestamped == -1)
pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
}
static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
{
AVDictionary *opts = NULL;
int ret;
int is_http = 0;
if (c->http_persistent)
av_dict_set(&opts, "multiple_requests", "1", 0);
if (seg->size >= 0) {
/* try to restrict the HTTP request to the part we want
* (if this is in fact a HTTP request) */
av_dict_set_int(&opts, "offset", seg->url_offset, 0);
av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
}
av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
seg->url, seg->url_offset, pls->index);
if (seg->key_type == KEY_AES_128 || seg->key_type == KEY_SAMPLE_AES) {
if (strcmp(seg->key, pls->key_url)) {
AVIOContext *pb = NULL;
if (open_url(pls->parent, &pb, seg->key, &c->avio_opts, opts, NULL) == 0) {
ret = avio_read(pb, pls->key, sizeof(pls->key));
if (ret != sizeof(pls->key)) {
av_log(pls->parent, AV_LOG_ERROR, "Unable to read key file %s\n",
seg->key);
}
ff_format_io_close(pls->parent, &pb);
} else {
av_log(pls->parent, AV_LOG_ERROR, "Unable to open key file %s\n",
seg->key);
}
av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
}
}
if (seg->key_type == KEY_AES_128) {
char iv[33], key[33], url[MAX_URL_SIZE];
ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
if (strstr(seg->url, "://"))
snprintf(url, sizeof(url), "crypto+%s", seg->url);
else
snprintf(url, sizeof(url), "crypto:%s", seg->url);
av_dict_set(&opts, "key", key, 0);
av_dict_set(&opts, "iv", iv, 0);
ret = open_url(pls->parent, in, url, &c->avio_opts, opts, &is_http);
if (ret < 0) {
goto cleanup;
}
ret = 0;
} else {
ret = open_url(pls->parent, in, seg->url, &c->avio_opts, opts, &is_http);
}
/* Seek to the requested position. If this was a HTTP request, the offset
* should already be where want it to, but this allows e.g. local testing
* without a HTTP server.
*
* This is not done for HTTP at all as avio_seek() does internal bookkeeping
* of file offset which is out-of-sync with the actual offset when "offset"
* AVOption is used with http protocol, causing the seek to not be a no-op
* as would be expected. Wrong offset received from the server will not be
* noticed without the call, though.
*/
if (ret == 0 && !is_http && seg->url_offset) {
int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
if (seekret < 0) {
av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
ret = seekret;
ff_format_io_close(pls->parent, in);
}
}
cleanup:
av_dict_free(&opts);
pls->cur_seg_offset = 0;
return ret;
}
static int update_init_section(struct playlist *pls, struct segment *seg)
{
static const int max_init_section_size = 1024*1024;
HLSContext *c = pls->parent->priv_data;
int64_t sec_size;
int64_t urlsize;
int ret;
if (seg->init_section == pls->cur_init_section)
return 0;
pls->cur_init_section = NULL;
if (!seg->init_section)
return 0;
ret = open_input(c, pls, seg->init_section, &pls->input);
if (ret < 0) {
av_log(pls->parent, AV_LOG_WARNING,
"Failed to open an initialization section in playlist %d\n",
pls->index);
return ret;
}
if (seg->init_section->size >= 0)
sec_size = seg->init_section->size;
else if ((urlsize = avio_size(pls->input)) >= 0)
sec_size = urlsize;
else
sec_size = max_init_section_size;
av_log(pls->parent, AV_LOG_DEBUG,
"Downloading an initialization section of size %"PRId64"\n",
sec_size);
sec_size = FFMIN(sec_size, max_init_section_size);
av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
pls->init_sec_buf_size);
ff_format_io_close(pls->parent, &pls->input);
if (ret < 0)
return ret;
pls->cur_init_section = seg->init_section;
pls->init_sec_data_len = ret;
pls->init_sec_buf_read_offset = 0;
/* spec says audio elementary streams do not have media initialization
* sections, so there should be no ID3 timestamps */
pls->is_id3_timestamped = 0;
return 0;
}
static int64_t default_reload_interval(struct playlist *pls)
{
return pls->n_segments > 0 ?
pls->segments[pls->n_segments - 1]->duration :
pls->target_duration;
}
static int playlist_needed(struct playlist *pls)
{
AVFormatContext *s = pls->parent;
int i, j;
int stream_needed = 0;
int first_st;
/* If there is no context or streams yet, the playlist is needed */
if (!pls->ctx || !pls->n_main_streams)
return 1;
/* check if any of the streams in the playlist are needed */
for (i = 0; i < pls->n_main_streams; i++) {
if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
stream_needed = 1;
break;
}
}
/* If all streams in the playlist were discarded, the playlist is not
* needed (regardless of whether whole programs are discarded or not). */
if (!stream_needed)
return 0;
/* Otherwise, check if all the programs (variants) this playlist is in are
* discarded. Since all streams in the playlist are part of the same programs
* we can just check the programs of the first stream. */
first_st = pls->main_streams[0]->index;
for (i = 0; i < s->nb_programs; i++) {
AVProgram *program = s->programs[i];
if (program->discard < AVDISCARD_ALL) {
for (j = 0; j < program->nb_stream_indexes; j++) {
if (program->stream_index[j] == first_st) {
/* playlist is in an undiscarded program */
return 1;
}
}
}
}
/* some streams were not discarded but all the programs were */
return 0;
}
static int read_data(void *opaque, uint8_t *buf, int buf_size)
{
struct playlist *v = opaque;
HLSContext *c = v->parent->priv_data;
int ret;
int just_opened = 0;
int reload_count = 0;
int segment_retries = 0;
struct segment *seg;
restart:
if (!v->needed)
return AVERROR_EOF;
if (!v->input || (c->http_persistent && v->input_read_done)) {
int64_t reload_interval;
/* Check that the playlist is still needed before opening a new
* segment. */
v->needed = playlist_needed(v);
if (!v->needed) {
av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
v->index, v->url);
return AVERROR_EOF;
}
/* If this is a live stream and the reload interval has elapsed since
* the last playlist reload, reload the playlists now. */
reload_interval = default_reload_interval(v);
reload:
reload_count++;
if (reload_count > c->max_reload)
return AVERROR_EOF;
if (!v->finished &&
av_gettime_relative() - v->last_load_time >= reload_interval) {
if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
if (ret != AVERROR_EXIT)
av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
v->index);
return ret;
}
/* If we need to reload the playlist again below (if
* there's still no more segments), switch to a reload
* interval of half the target duration. */
reload_interval = v->target_duration / 2;
}
if (v->cur_seq_no < v->start_seq_no) {
av_log(v->parent, AV_LOG_WARNING,
"skipping %"PRId64" segments ahead, expired from playlists\n",
v->start_seq_no - v->cur_seq_no);
v->cur_seq_no = v->start_seq_no;
}
if (v->cur_seq_no > v->last_seq_no) {
v->last_seq_no = v->cur_seq_no;
v->m3u8_hold_counters = 0;
} else if (v->last_seq_no == v->cur_seq_no) {
v->m3u8_hold_counters++;
if (v->m3u8_hold_counters >= c->m3u8_hold_counters) {
return AVERROR_EOF;
}
} else {
av_log(v->parent, AV_LOG_WARNING, "The m3u8 list sequence may have been wrapped.\n");
}
if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
if (v->finished)
return AVERROR_EOF;
while (av_gettime_relative() - v->last_load_time < reload_interval) {
if (ff_check_interrupt(c->interrupt_callback))
return AVERROR_EXIT;
av_usleep(100*1000);
}
/* Enough time has elapsed since the last reload */
goto reload;
}
v->input_read_done = 0;
seg = current_segment(v);
/* load/update Media Initialization Section, if any */
ret = update_init_section(v, seg);
if (ret)
return ret;
if (c->http_multiple == 1 && v->input_next_requested) {
FFSWAP(AVIOContext *, v->input, v->input_next);
v->cur_seg_offset = 0;
v->input_next_requested = 0;
ret = 0;
} else {
ret = open_input(c, v, seg, &v->input);
}
if (ret < 0) {
if (ff_check_interrupt(c->interrupt_callback))
return AVERROR_EXIT;
av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %"PRId64" of playlist %d\n",
v->cur_seq_no,
v->index);
if (segment_retries >= c->seg_max_retry) {
av_log(v->parent, AV_LOG_WARNING, "Segment %"PRId64" of playlist %d failed too many times, skipping\n",
v->cur_seq_no,
v->index);
v->cur_seq_no++;
segment_retries = 0;
} else {
segment_retries++;
}
goto reload;
}
segment_retries = 0;
just_opened = 1;
}
if (c->http_multiple == -1) {
uint8_t *http_version_opt = NULL;
int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
if (r >= 0) {
c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
av_freep(&http_version_opt);
}
}
seg = next_segment(v);
if (c->http_multiple == 1 && !v->input_next_requested &&
seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
ret = open_input(c, v, seg, &v->input_next);
if (ret < 0) {
if (ff_check_interrupt(c->interrupt_callback))
return AVERROR_EXIT;
av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %"PRId64" of playlist %d\n",
v->cur_seq_no + 1,
v->index);
} else {
v->input_next_requested = 1;
}
}
if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
/* Push init section out first before first actual segment */
int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
memcpy(buf, v->init_sec_buf, copy_size);
v->init_sec_buf_read_offset += copy_size;
return copy_size;
}
seg = current_segment(v);
ret = read_from_url(v, seg, buf, buf_size);
if (ret > 0) {
if (just_opened && v->is_id3_timestamped != 0) {
/* Intercept ID3 tags here, elementary audio streams are required
* to convey timestamps using them in the beginning of each segment. */
intercept_id3(v, buf, buf_size, &ret);
}
return ret;
}
if (c->http_persistent &&
seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
v->input_read_done = 1;
} else {
ff_format_io_close(v->parent, &v->input);
}
v->cur_seq_no++;
c->cur_seq_no = v->cur_seq_no;
goto restart;
}
static void add_renditions_to_variant(HLSContext *c, struct variant *var,
enum AVMediaType type, const char *group_id)
{
int i;
for (i = 0; i < c->n_renditions; i++) {
struct rendition *rend = c->renditions[i];
if (rend->type == type && !strcmp(rend->group_id, group_id)) {
if (rend->playlist)
/* rendition is an external playlist
* => add the playlist to the variant */
dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
else
/* rendition is part of the variant main Media Playlist
* => add the rendition to the main Media Playlist */
dynarray_add(&var->playlists[0]->renditions,
&var->playlists[0]->n_renditions,
rend);
}
}
}
static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
enum AVMediaType type)
{
int rend_idx = 0;
int i;
for (i = 0; i < pls->n_main_streams; i++) {
AVStream *st = pls->main_streams[i];
if (st->codecpar->codec_type != type)
continue;
for (; rend_idx < pls->n_renditions; rend_idx++) {
struct rendition *rend = pls->renditions[rend_idx];
if (rend->type != type)
continue;
if (rend->language[0])
av_dict_set(&st->metadata, "language", rend->language, 0);
if (rend->name[0])
av_dict_set(&st->metadata, "comment", rend->name, 0);
st->disposition |= rend->disposition;
}
if (rend_idx >=pls->n_renditions)
break;
}
}
/* if timestamp was in valid range: returns 1 and sets seq_no
* if not: returns 0 and sets seq_no to closest segment */
static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
int64_t timestamp, int64_t *seq_no,
int64_t *seg_start_ts)
{
int i;
int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
0 : c->first_timestamp;
if (timestamp < pos) {
*seq_no = pls->start_seq_no;
return 0;
}
for (i = 0; i < pls->n_segments; i++) {
int64_t diff = pos + pls->segments[i]->duration - timestamp;
if (diff > 0) {
*seq_no = pls->start_seq_no + i;
if (seg_start_ts) {
*seg_start_ts = pos;
}
return 1;
}
pos += pls->segments[i]->duration;
}
*seq_no = pls->start_seq_no + pls->n_segments - 1;
return 0;
}
static int64_t select_cur_seq_no(HLSContext *c, struct playlist *pls)
{
int64_t seq_no;
if (!pls->finished && !c->first_packet &&
av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
/* reload the playlist since it was suspended */
parse_playlist(c, pls->url, pls, NULL);
/* If playback is already in progress (we are just selecting a new
* playlist) and this is a complete file, find the matching segment
* by counting durations. */
if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no, NULL);
return seq_no;
}
if (!pls->finished) {
if (!c->first_packet && /* we are doing a segment selection during playback */
c->cur_seq_no >= pls->start_seq_no &&
c->cur_seq_no < pls->start_seq_no + pls->n_segments)
/* While spec 3.4.3 says that we cannot assume anything about the
* content at the same sequence number on different playlists,
* in practice this seems to work and doing it otherwise would
* require us to download a segment to inspect its timestamps. */
return c->cur_seq_no;
/* If this is a live stream, start live_start_index segments from the
* start or end */
if (c->live_start_index < 0)
seq_no = pls->start_seq_no + FFMAX(pls->n_segments +
c->live_start_index, 0);
else
seq_no = pls->start_seq_no + FFMIN(c->live_start_index,
pls->n_segments - 1);
/* If #EXT-X-START in playlist, need to recalculate */
if (pls->time_offset_flag && c->prefer_x_start) {
int64_t start_timestamp;
int64_t playlist_duration = 0;
int64_t cur_timestamp = c->cur_timestamp == AV_NOPTS_VALUE ? 0 :
c->cur_timestamp;
for (int i = 0; i < pls->n_segments; i++)
playlist_duration += pls->segments[i]->duration;
/* If the absolute value of TIME-OFFSET exceeds
* the duration of the playlist, it indicates either the end of the
* playlist (if positive) or the beginning of the playlist (if
* negative). */
if (pls->start_time_offset >=0 &&
pls->start_time_offset > playlist_duration)
start_timestamp = cur_timestamp + playlist_duration;
else if (pls->start_time_offset >= 0 &&
pls->start_time_offset <= playlist_duration)
start_timestamp = cur_timestamp + pls->start_time_offset;
else if (pls->start_time_offset < 0 &&
pls->start_time_offset < -playlist_duration)
start_timestamp = cur_timestamp;
else if (pls->start_time_offset < 0 &&
pls->start_time_offset > -playlist_duration)
start_timestamp = cur_timestamp + playlist_duration +
pls->start_time_offset;
else
start_timestamp = cur_timestamp;
find_timestamp_in_playlist(c, pls, start_timestamp, &seq_no, NULL);
}
return seq_no;
}
/* Otherwise just start on the first segment. */
return pls->start_seq_no;
}
static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
int flags, AVDictionary **opts)
{
av_log(s, AV_LOG_ERROR,
"A HLS playlist item '%s' referred to an external file '%s'. "
"Opening this file was forbidden for security reasons\n",
s->url, url);
return AVERROR(EPERM);
}
static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
{
HLSContext *c = s->priv_data;
int i, j;
int bandwidth = -1;
for (i = 0; i < c->n_variants; i++) {
struct variant *v = c->variants[i];
for (j = 0; j < v->n_playlists; j++) {
if (v->playlists[j] != pls)
continue;
av_program_add_stream_index(s, i, stream->index);
if (bandwidth < 0)
bandwidth = v->bandwidth;
else if (bandwidth != v->bandwidth)
bandwidth = -1; /* stream in multiple variants with different bandwidths */
}
}
if (bandwidth >= 0)
av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
}
static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
{
int err;
err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
if (err < 0)
return err;
if (pls->is_id3_timestamped) /* custom timestamps via id3 */
avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
else
avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
// copy disposition
st->disposition = ist->disposition;
av_dict_copy(&st->metadata, ist->metadata, 0);
ffstream(st)->need_context_update = 1;
return 0;
}
/* add new subdemuxer streams to our context, if any */
static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
{
int err;
while (pls->n_main_streams < pls->ctx->nb_streams) {
int ist_idx = pls->n_main_streams;
AVStream *st = avformat_new_stream(s, NULL);
AVStream *ist = pls->ctx->streams[ist_idx];
if (!st)
return AVERROR(ENOMEM);
st->id = pls->index;
dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
add_stream_to_programs(s, pls, st);
err = set_stream_info_from_input_stream(st, pls, ist);
if (err < 0)
return err;
}
return 0;
}
static void update_noheader_flag(AVFormatContext *s)
{
HLSContext *c = s->priv_data;
int flag_needed = 0;
int i;
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
if (pls->has_noheader_flag) {
flag_needed = 1;
break;
}
}
if (flag_needed)
s->ctx_flags |= AVFMTCTX_NOHEADER;
else
s->ctx_flags &= ~AVFMTCTX_NOHEADER;
}
static int hls_close(AVFormatContext *s)
{
HLSContext *c = s->priv_data;
free_playlist_list(c);
free_variant_list(c);
free_rendition_list(c);
if (c->crypto_ctx.aes_ctx)
av_free(c->crypto_ctx.aes_ctx);
av_dict_free(&c->avio_opts);
ff_format_io_close(c->ctx, &c->playlist_pb);
return 0;
}
static int hls_read_header(AVFormatContext *s)
{
HLSContext *c = s->priv_data;
int ret = 0, i;
int64_t highest_cur_seq_no = 0;
c->ctx = s;
c->interrupt_callback = &s->interrupt_callback;
c->first_packet = 1;
c->first_timestamp = AV_NOPTS_VALUE;
c->cur_timestamp = AV_NOPTS_VALUE;
if ((ret = ffio_copy_url_options(s->pb, &c->avio_opts)) < 0)
return ret;
/* XXX: Some HLS servers don't like being sent the range header,
in this case, need to setting http_seekable = 0 to disable
the range header */
av_dict_set_int(&c->avio_opts, "seekable", c->http_seekable, 0);
if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
return ret;
if (c->n_variants == 0) {
av_log(s, AV_LOG_WARNING, "Empty playlist\n");
return AVERROR_EOF;
}
/* If the playlist only contained playlists (Master Playlist),
* parse each individual playlist. */
if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
pls->m3u8_hold_counters = 0;
if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) {
av_log(s, AV_LOG_WARNING, "parse_playlist error %s [%s]\n", av_err2str(ret), pls->url);
pls->broken = 1;
if (c->n_playlists > 1)
continue;
return ret;
}
}
}
for (i = 0; i < c->n_variants; i++) {
if (c->variants[i]->playlists[0]->n_segments == 0) {
av_log(s, AV_LOG_WARNING, "Empty segment [%s]\n", c->variants[i]->playlists[0]->url);
c->variants[i]->playlists[0]->broken = 1;
}
}
/* If this isn't a live stream, calculate the total duration of the
* stream. */
if (c->variants[0]->playlists[0]->finished) {
int64_t duration = 0;
for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
duration += c->variants[0]->playlists[0]->segments[i]->duration;
s->duration = duration;
}
/* Associate renditions with variants */
for (i = 0; i < c->n_variants; i++) {
struct variant *var = c->variants[i];
if (var->audio_group[0])
add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
if (var->video_group[0])
add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
if (var->subtitles_group[0])
add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
}
/* Create a program for each variant */
for (i = 0; i < c->n_variants; i++) {
struct variant *v = c->variants[i];
AVProgram *program;
program = av_new_program(s, i);
if (!program)
return AVERROR(ENOMEM);
av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
}
/* Select the starting segments */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
if (pls->n_segments == 0)
continue;
pls->cur_seq_no = select_cur_seq_no(c, pls);
highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
}
/* Open the demuxer for each playlist */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
const AVInputFormat *in_fmt = NULL;
char *url;
AVDictionary *options = NULL;
struct segment *seg = NULL;
if (!(pls->ctx = avformat_alloc_context()))
return AVERROR(ENOMEM);
if (pls->n_segments == 0)
continue;
pls->index = i;
pls->needed = 1;
pls->parent = s;
/*
* If this is a live stream and this playlist looks like it is one segment
* behind, try to sync it up so that every substream starts at the same
* time position (so e.g. avformat_find_stream_info() will see packets from
* all active streams within the first few seconds). This is not very generic,
* though, as the sequence numbers are technically independent.
*/
if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
pls->cur_seq_no = highest_cur_seq_no;
}
pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
if (!pls->read_buffer){
avformat_free_context(pls->ctx);
pls->ctx = NULL;
return AVERROR(ENOMEM);
}
ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
read_data, NULL, NULL);
/*
* If encryption scheme is SAMPLE-AES, try to read ID3 tags of
* external audio track that contains audio setup information
*/
seg = current_segment(pls);
if (seg && seg->key_type == KEY_SAMPLE_AES && pls->n_renditions > 0 &&
pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO) {
uint8_t buf[HLS_MAX_ID3_TAGS_DATA_LEN];
if ((ret = avio_read(&pls->pb.pub, buf, HLS_MAX_ID3_TAGS_DATA_LEN)) < 0) {
/* Fail if error was not end of file */
if (ret != AVERROR_EOF) {
avformat_free_context(pls->ctx);
pls->ctx = NULL;
return ret;
}
}
ret = 0;
/* Reset reading */
ff_format_io_close(pls->parent, &pls->input);
pls->input = NULL;
pls->input_read_done = 0;
ff_format_io_close(pls->parent, &pls->input_next);
pls->input_next = NULL;
pls->input_next_requested = 0;
pls->cur_seg_offset = 0;
pls->cur_init_section = NULL;
/* Reset EOF flag */
pls->pb.pub.eof_reached = 0;
/* Clear any buffered data */
pls->pb.pub.buf_end = pls->pb.pub.buf_ptr = pls->pb.pub.buffer;
/* Reset the position */
pls->pb.pub.pos = 0;
}
/*
* If encryption scheme is SAMPLE-AES and audio setup information is present in external audio track,
* use that information to find the media format, otherwise probe input data
*/
seg = current_segment(pls);
if (seg && seg->key_type == KEY_SAMPLE_AES && pls->is_id3_timestamped &&
pls->audio_setup_info.codec_id != AV_CODEC_ID_NONE) {
av_assert1(pls->audio_setup_info.codec_id == AV_CODEC_ID_AAC ||
pls->audio_setup_info.codec_id == AV_CODEC_ID_AC3 ||
pls->audio_setup_info.codec_id == AV_CODEC_ID_EAC3);
// Keep this list in sync with ff_hls_senc_read_audio_setup_info()
in_fmt = av_find_input_format(pls->audio_setup_info.codec_id == AV_CODEC_ID_AAC ? "aac" :
pls->audio_setup_info.codec_id == AV_CODEC_ID_AC3 ? "ac3" : "eac3");
} else {
pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4;
pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE;
pls->ctx->interrupt_callback = s->interrupt_callback;
url = av_strdup(pls->segments[0]->url);
ret = av_probe_input_buffer(&pls->pb.pub, &in_fmt, url, NULL, 0, 0);
if (ret < 0) {
/* Free the ctx - it isn't initialized properly at this point,
* so avformat_close_input shouldn't be called. If
* avformat_open_input fails below, it frees and zeros the
* context, so it doesn't need any special treatment like this. */
av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", url);
avformat_free_context(pls->ctx);
pls->ctx = NULL;
av_free(url);
return ret;
}
av_free(url);
}
seg = current_segment(pls);
if (seg && seg->key_type == KEY_SAMPLE_AES) {
if (strstr(in_fmt->name, "mov")) {
char key[33];
ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
av_dict_set(&options, "decryption_key", key, 0);
} else if (!c->crypto_ctx.aes_ctx) {
c->crypto_ctx.aes_ctx = av_aes_alloc();
if (!c->crypto_ctx.aes_ctx) {
avformat_free_context(pls->ctx);
pls->ctx = NULL;
return AVERROR(ENOMEM);
}
}
}
pls->ctx->pb = &pls->pb.pub;
pls->ctx->io_open = nested_io_open;
pls->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
return ret;
av_dict_copy(&options, c->seg_format_opts, 0);
ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, &options);
av_dict_free(&options);
if (ret < 0)
return ret;
if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
ff_id3v2_parse_apic(pls->ctx, pls->id3_deferred_extra);
avformat_queue_attached_pictures(pls->ctx);
ff_id3v2_parse_priv(pls->ctx, pls->id3_deferred_extra);
ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
}
if (pls->is_id3_timestamped == -1)
av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
/*
* For ID3 timestamped raw audio streams we need to detect the packet
* durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
* but for other streams we can rely on our user calling avformat_find_stream_info()
* on us if they want to.
*/
if (pls->is_id3_timestamped || (pls->n_renditions > 0 && pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) {
seg = current_segment(pls);
if (seg && seg->key_type == KEY_SAMPLE_AES && pls->audio_setup_info.setup_data_length > 0 &&
pls->ctx->nb_streams == 1)
ret = ff_hls_senc_parse_audio_setup_info(pls->ctx->streams[0], &pls->audio_setup_info);
else
ret = avformat_find_stream_info(pls->ctx, NULL);
if (ret < 0)
return ret;
}
pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
/* Create new AVStreams for each stream in this playlist */
ret = update_streams_from_subdemuxer(s, pls);
if (ret < 0)
return ret;
/*
* Copy any metadata from playlist to main streams, but do not set
* event flags.
*/
if (pls->n_main_streams)
av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);
add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
}
update_noheader_flag(s);
return 0;
}
static int recheck_discard_flags(AVFormatContext *s, int first)
{
HLSContext *c = s->priv_data;
int i, changed = 0;
int cur_needed;
/* Check if any new streams are needed */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
cur_needed = playlist_needed(c->playlists[i]);
if (pls->broken) {
continue;
}
if (cur_needed && !pls->needed) {
pls->needed = 1;
changed = 1;
pls->cur_seq_no = select_cur_seq_no(c, pls);
pls->pb.pub.eof_reached = 0;
if (c->cur_timestamp != AV_NOPTS_VALUE) {
/* catch up */
pls->seek_timestamp = c->cur_timestamp;
pls->seek_flags = AVSEEK_FLAG_ANY;
pls->seek_stream_index = -1;
}
av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %"PRId64"\n", i, pls->cur_seq_no);
} else if (first && !cur_needed && pls->needed) {
ff_format_io_close(pls->parent, &pls->input);
pls->input_read_done = 0;
ff_format_io_close(pls->parent, &pls->input_next);
pls->input_next_requested = 0;
pls->needed = 0;
changed = 1;
av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
}
}
return changed;
}
static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
{
if (pls->id3_offset >= 0) {
pls->pkt->dts = pls->id3_mpegts_timestamp +
av_rescale_q(pls->id3_offset,
pls->ctx->streams[pls->pkt->stream_index]->time_base,
MPEG_TIME_BASE_Q);
if (pls->pkt->duration)
pls->id3_offset += pls->pkt->duration;
else
pls->id3_offset = -1;
} else {
/* there have been packets with unknown duration
* since the last id3 tag, should not normally happen */
pls->pkt->dts = AV_NOPTS_VALUE;
}
if (pls->pkt->duration)
pls->pkt->duration = av_rescale_q(pls->pkt->duration,
pls->ctx->streams[pls->pkt->stream_index]->time_base,
MPEG_TIME_BASE_Q);
pls->pkt->pts = AV_NOPTS_VALUE;
}
static AVRational get_timebase(struct playlist *pls)
{
if (pls->is_id3_timestamped)
return MPEG_TIME_BASE_Q;
return pls->ctx->streams[pls->pkt->stream_index]->time_base;
}
static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
int64_t ts_b, struct playlist *pls_b)
{
int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
}
static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
{
HLSContext *c = s->priv_data;
int ret, i, minplaylist = -1;
recheck_discard_flags(s, c->first_packet);
c->first_packet = 0;
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
/* Make sure we've got one buffered packet from each open playlist
* stream */
if (pls->needed && !pls->pkt->data) {
while (1) {
int64_t ts_diff;
AVRational tb;
struct segment *seg = NULL;
ret = av_read_frame(pls->ctx, pls->pkt);
if (ret < 0) {
if (!avio_feof(&pls->pb.pub) && ret != AVERROR_EOF)
return ret;
break;
} else {
/* stream_index check prevents matching picture attachments etc. */
if (pls->is_id3_timestamped && pls->pkt->stream_index == 0) {
/* audio elementary streams are id3 timestamped */
fill_timing_for_id3_timestamped_stream(pls);
}
if (c->first_timestamp == AV_NOPTS_VALUE &&
pls->pkt->dts != AV_NOPTS_VALUE)
c->first_timestamp = av_rescale_q(pls->pkt->dts,
get_timebase(pls), AV_TIME_BASE_Q);
}
seg = current_segment(pls);
if (seg && seg->key_type == KEY_SAMPLE_AES && !strstr(pls->ctx->iformat->name, "mov")) {
enum AVCodecID codec_id = pls->ctx->streams[pls->pkt->stream_index]->codecpar->codec_id;
memcpy(c->crypto_ctx.iv, seg->iv, sizeof(seg->iv));
memcpy(c->crypto_ctx.key, pls->key, sizeof(pls->key));
ff_hls_senc_decrypt_frame(codec_id, &c->crypto_ctx, pls->pkt);
}
if (pls->seek_timestamp == AV_NOPTS_VALUE)
break;
if (pls->seek_stream_index < 0 ||
pls->seek_stream_index == pls->pkt->stream_index) {
if (pls->pkt->dts == AV_NOPTS_VALUE) {
pls->seek_timestamp = AV_NOPTS_VALUE;
break;
}
tb = get_timebase(pls);
ts_diff = av_rescale_rnd(pls->pkt->dts, AV_TIME_BASE,
tb.den, AV_ROUND_DOWN) -
pls->seek_timestamp;
if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
pls->pkt->flags & AV_PKT_FLAG_KEY)) {
pls->seek_timestamp = AV_NOPTS_VALUE;
break;
}
}
av_packet_unref(pls->pkt);
}
}
/* Check if this stream has the packet with the lowest dts */
if (pls->pkt->data) {
struct playlist *minpls = minplaylist < 0 ?
NULL : c->playlists[minplaylist];
if (minplaylist < 0) {
minplaylist = i;
} else {
int64_t dts = pls->pkt->dts;
int64_t mindts = minpls->pkt->dts;
if (dts == AV_NOPTS_VALUE ||
(mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
minplaylist = i;
}
}
}
/* If we got a packet, return it */
if (minplaylist >= 0) {
struct playlist *pls = c->playlists[minplaylist];
AVStream *ist;
AVStream *st;
ret = update_streams_from_subdemuxer(s, pls);
if (ret < 0) {
av_packet_unref(pls->pkt);
return ret;
}
// If sub-demuxer reports updated metadata, copy it to the first stream
// and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
if (pls->ctx->event_flags & AVFMT_EVENT_FLAG_METADATA_UPDATED) {
if (pls->n_main_streams) {
st = pls->main_streams[0];
av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
}
pls->ctx->event_flags &= ~AVFMT_EVENT_FLAG_METADATA_UPDATED;
}
/* check if noheader flag has been cleared by the subdemuxer */
if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
pls->has_noheader_flag = 0;
update_noheader_flag(s);
}
if (pls->pkt->stream_index >= pls->n_main_streams) {
av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
pls->pkt->stream_index, pls->n_main_streams, pls->ctx->nb_streams);
av_packet_unref(pls->pkt);
return AVERROR_BUG;
}
ist = pls->ctx->streams[pls->pkt->stream_index];
st = pls->main_streams[pls->pkt->stream_index];
av_packet_move_ref(pkt, pls->pkt);
pkt->stream_index = st->index;
if (pkt->dts != AV_NOPTS_VALUE)
c->cur_timestamp = av_rescale_q(pkt->dts,
ist->time_base,
AV_TIME_BASE_Q);
/* There may be more situations where this would be useful, but this at least
* handles newly probed codecs properly (i.e. request_probe by mpegts). */
if (ist->codecpar->codec_id != st->codecpar->codec_id) {
ret = set_stream_info_from_input_stream(st, pls, ist);
if (ret < 0) {
return ret;
}
}
return 0;
}
return AVERROR_EOF;
}
static int hls_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
HLSContext *c = s->priv_data;
struct playlist *seek_pls = NULL;
int i, j;
int stream_subdemuxer_index;
int64_t first_timestamp, seek_timestamp, duration;
int64_t seq_no, seg_start_ts;
if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
return AVERROR(ENOSYS);
first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
0 : c->first_timestamp;
seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
s->streams[stream_index]->time_base.den,
AV_ROUND_DOWN);
duration = s->duration == AV_NOPTS_VALUE ?
0 : s->duration;
if (0 < duration && duration < seek_timestamp - first_timestamp)
return AVERROR(EIO);
/* find the playlist with the specified stream */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
for (j = 0; j < pls->n_main_streams; j++) {
if (pls->main_streams[j] == s->streams[stream_index]) {
seek_pls = pls;
stream_subdemuxer_index = j;
break;
}
}
}
/* check if the timestamp is valid for the playlist with the
* specified stream index */
if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no, &seg_start_ts))
return AVERROR(EIO);
if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
flags & AVSEEK_FLAG_BACKWARD && !(flags & AVSEEK_FLAG_ANY)) {
/* Seeking to start of segment ensures we seek to a keyframe located
* before the given timestamp. */
seek_timestamp = seg_start_ts;
}
/* set segment now so we do not need to search again below */
seek_pls->cur_seq_no = seq_no;
seek_pls->seek_stream_index = stream_subdemuxer_index;
for (i = 0; i < c->n_playlists; i++) {
/* Reset reading */
struct playlist *pls = c->playlists[i];
AVIOContext *const pb = &pls->pb.pub;
ff_format_io_close(pls->parent, &pls->input);
pls->input_read_done = 0;
ff_format_io_close(pls->parent, &pls->input_next);
pls->input_next_requested = 0;
av_packet_unref(pls->pkt);
pb->eof_reached = 0;
/* Clear any buffered data */
pb->buf_end = pb->buf_ptr = pb->buffer;
/* Reset the pos, to let the mpegts/mov demuxer know we've seeked. */
pb->pos = 0;
/* Flush the packet queue of the subdemuxer. */
ff_read_frame_flush(pls->ctx);
/* Reset the init segment so it's re-fetched and served appropiately */
pls->cur_init_section = NULL;
pls->seek_timestamp = seek_timestamp;
pls->seek_flags = flags;
if (pls != seek_pls) {
/* set closest segment seq_no for playlists not handled above */
find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no, NULL);
/* seek the playlist to the given position without taking
* keyframes into account since this playlist does not have the
* specified stream where we should look for the keyframes */
pls->seek_stream_index = -1;
pls->seek_flags |= AVSEEK_FLAG_ANY;
}
}
c->cur_timestamp = seek_timestamp;
return 0;
}
static int hls_probe(const AVProbeData *p)
{
/* Require #EXTM3U at the start, and either one of the ones below
* somewhere for a proper match. */
if (strncmp(p->buf, "#EXTM3U", 7))
return 0;
if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:")) {
int mime_ok = p->mime_type && !(
av_strcasecmp(p->mime_type, "application/vnd.apple.mpegurl") &&
av_strcasecmp(p->mime_type, "audio/mpegurl")
);
int mime_x = p->mime_type && !(
av_strcasecmp(p->mime_type, "audio/x-mpegurl") &&
av_strcasecmp(p->mime_type, "application/x-mpegurl")
);
if (!mime_ok &&
!mime_x &&
!av_match_ext (p->filename, "m3u8,m3u") &&
ff_match_url_ext(p->filename, "m3u8,m3u") <= 0) {
av_log(NULL, AV_LOG_ERROR, "Not detecting m3u8/hls with non standard extension and non standard mime type\n");
return 0;
}
if (mime_x)
av_log(NULL, AV_LOG_WARNING, "mime type is not rfc8216 compliant\n");
return AVPROBE_SCORE_MAX;
}
return 0;
}
#define OFFSET(x) offsetof(HLSContext, x)
#define FLAGS AV_OPT_FLAG_DECODING_PARAM
static const AVOption hls_options[] = {
{"live_start_index", "segment index to start live streams at (negative values are from the end)",
OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
{"prefer_x_start", "prefer to use #EXT-X-START if it's in playlist instead of live_start_index",
OFFSET(prefer_x_start), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS},
{"allowed_extensions", "List of file extensions that hls is allowed to access",
OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
{.str = "3gp,aac,avi,ac3,eac3,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
INT_MIN, INT_MAX, FLAGS},
{"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 3}, 0, INT_MAX, FLAGS},
{"m3u8_hold_counters", "The maximum number of times to load m3u8 when it refreshes without new segments",
OFFSET(m3u8_hold_counters), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
{"http_persistent", "Use persistent HTTP connections",
OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
{"http_multiple", "Use multiple HTTP connections for fetching segments",
OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
{"http_seekable", "Use HTTP partial requests, 0 = disable, 1 = enable, -1 = auto",
OFFSET(http_seekable), AV_OPT_TYPE_BOOL, { .i64 = -1}, -1, 1, FLAGS},
{"seg_format_options", "Set options for segment demuxer",
OFFSET(seg_format_opts), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, FLAGS},
{"seg_max_retry", "Maximum number of times to reload a segment on error.",
OFFSET(seg_max_retry), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS},
{NULL}
};
static const AVClass hls_class = {
.class_name = "hls demuxer",
.item_name = av_default_item_name,
.option = hls_options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFInputFormat ff_hls_demuxer = {
.p.name = "hls",
.p.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
.p.priv_class = &hls_class,
.p.flags = AVFMT_NOGENSEARCH | AVFMT_TS_DISCONT | AVFMT_NO_BYTE_SEEK,
.priv_data_size = sizeof(HLSContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = hls_probe,
.read_header = hls_read_header,
.read_packet = hls_read_packet,
.read_close = hls_close,
.read_seek = hls_read_seek,
};
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