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release/6.1
FFmpeg/libavformat/hls.c
James Almer 5432d2aaca avformat/avformat: use the side data from AVStream.codecpar 
Deprecate AVStream.side_data and its helpers in favor of the AVStream's
codecpar.coded_side_data.

This will considerably simplify the propagation of global side data to decoders
and from encoders. Instead of having to do it inside packets, it will be
available during init().
Global and frame specific side data will therefore be distinct.

Signed-off-by: James Almer <jamrial@gmail.com>
2023-10-06 10:03:57 -03:00

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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/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]) {
int langlen = strlen(rend->language);
if (langlen < sizeof(rend->language) - 3) {
rend->language[langlen] = ',';
strncpy(rend->language + langlen + 1, info->assoc_language,
sizeof(rend->language) - langlen - 2);
}
}
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
*/
if (seg && seg->key_type == KEY_SAMPLE_AES && pls->is_id3_timestamped &&
pls->audio_setup_info.codec_id != AV_CODEC_ID_NONE) {
void *iter = NULL;
while ((in_fmt = av_demuxer_iterate(&iter)))
if (in_fmt->raw_codec_id == pls->audio_setup_info.codec_id)
break;
} 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);
}
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)) {
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 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 AVInputFormat ff_hls_demuxer = {
.name = "hls",
.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
.priv_class = &hls_class,
.priv_data_size = sizeof(HLSContext),
.flags = AVFMT_NOGENSEARCH | AVFMT_TS_DISCONT | AVFMT_NO_BYTE_SEEK,
.flags_internal = FF_FMT_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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