1727 lines
58 KiB
C
1727 lines
58 KiB
C
/*
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* Apple HTTP Live Streaming demuxer
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* Copyright (c) 2010 Martin Storsjo
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* Copyright (c) 2013 Anssi Hannula
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Apple HTTP Live Streaming demuxer
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* http://tools.ietf.org/html/draft-pantos-http-live-streaming
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/avassert.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/dict.h"
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#include "libavutil/time.h"
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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#include "url.h"
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#include "id3v2.h"
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#define INITIAL_BUFFER_SIZE 32768
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#define MAX_FIELD_LEN 64
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#define MAX_CHARACTERISTICS_LEN 512
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#define MPEG_TIME_BASE 90000
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#define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
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/*
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* An apple http stream consists of a playlist with media segment files,
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* played sequentially. There may be several playlists with the same
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* video content, in different bandwidth variants, that are played in
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* parallel (preferably only one bandwidth variant at a time). In this case,
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* the user supplied the url to a main playlist that only lists the variant
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* playlists.
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*
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* If the main playlist doesn't point at any variants, we still create
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* one anonymous toplevel variant for this, to maintain the structure.
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*/
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enum KeyType {
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KEY_NONE,
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KEY_AES_128,
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KEY_SAMPLE_AES
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};
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struct segment {
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int64_t duration;
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int64_t url_offset;
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int64_t size;
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char *url;
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char *key;
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enum KeyType key_type;
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uint8_t iv[16];
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};
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struct rendition;
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enum PlaylistType {
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PLS_TYPE_UNSPECIFIED,
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PLS_TYPE_EVENT,
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PLS_TYPE_VOD
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};
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/*
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* Each playlist has its own demuxer. If it currently is active,
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* it has an open AVIOContext too, and potentially an AVPacket
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* containing the next packet from this stream.
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*/
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struct playlist {
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char url[MAX_URL_SIZE];
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AVIOContext pb;
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uint8_t* read_buffer;
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URLContext *input;
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AVFormatContext *parent;
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int index;
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AVFormatContext *ctx;
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AVPacket pkt;
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int stream_offset;
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int finished;
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enum PlaylistType type;
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int64_t target_duration;
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int start_seq_no;
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int n_segments;
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struct segment **segments;
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int needed, cur_needed;
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int cur_seq_no;
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int64_t cur_seg_offset;
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int64_t last_load_time;
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char key_url[MAX_URL_SIZE];
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uint8_t key[16];
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/* ID3 timestamp handling (elementary audio streams have ID3 timestamps
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* (and possibly other ID3 tags) in the beginning of each segment) */
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int is_id3_timestamped; /* -1: not yet known */
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int64_t id3_mpegts_timestamp; /* in mpegts tb */
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int64_t id3_offset; /* in stream original tb */
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uint8_t* id3_buf; /* temp buffer for id3 parsing */
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unsigned int id3_buf_size;
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AVDictionary *id3_initial; /* data from first id3 tag */
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int id3_found; /* ID3 tag found at some point */
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int id3_changed; /* ID3 tag data has changed at some point */
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ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
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int64_t seek_timestamp;
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int seek_flags;
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int seek_stream_index; /* into subdemuxer stream array */
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/* Renditions associated with this playlist, if any.
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* Alternative rendition playlists have a single rendition associated
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* with them, and variant main Media Playlists may have
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* multiple (playlist-less) renditions associated with them. */
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int n_renditions;
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struct rendition **renditions;
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};
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/*
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* Renditions are e.g. alternative subtitle or audio streams.
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* The rendition may either be an external playlist or it may be
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* contained in the main Media Playlist of the variant (in which case
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* playlist is NULL).
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*/
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struct rendition {
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enum AVMediaType type;
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struct playlist *playlist;
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char group_id[MAX_FIELD_LEN];
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char language[MAX_FIELD_LEN];
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char name[MAX_FIELD_LEN];
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int disposition;
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};
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struct variant {
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int bandwidth;
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/* every variant contains at least the main Media Playlist in index 0 */
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int n_playlists;
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struct playlist **playlists;
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char audio_group[MAX_FIELD_LEN];
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char video_group[MAX_FIELD_LEN];
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char subtitles_group[MAX_FIELD_LEN];
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};
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typedef struct HLSContext {
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int n_variants;
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struct variant **variants;
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int n_playlists;
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struct playlist **playlists;
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int n_renditions;
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struct rendition **renditions;
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int cur_seq_no;
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int first_packet;
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int64_t first_timestamp;
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int64_t cur_timestamp;
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AVIOInterruptCB *interrupt_callback;
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char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
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char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
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char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context
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} HLSContext;
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static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
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{
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int len = ff_get_line(s, buf, maxlen);
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while (len > 0 && av_isspace(buf[len - 1]))
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buf[--len] = '\0';
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return len;
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}
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static void free_segment_list(struct playlist *pls)
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{
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int i;
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for (i = 0; i < pls->n_segments; i++) {
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av_freep(&pls->segments[i]->key);
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av_freep(&pls->segments[i]->url);
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av_freep(&pls->segments[i]);
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}
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av_freep(&pls->segments);
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pls->n_segments = 0;
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}
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static void free_playlist_list(HLSContext *c)
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{
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int i;
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for (i = 0; i < c->n_playlists; i++) {
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struct playlist *pls = c->playlists[i];
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free_segment_list(pls);
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av_freep(&pls->renditions);
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av_freep(&pls->id3_buf);
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av_dict_free(&pls->id3_initial);
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ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
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av_free_packet(&pls->pkt);
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av_freep(&pls->pb.buffer);
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if (pls->input)
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ffurl_close(pls->input);
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if (pls->ctx) {
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pls->ctx->pb = NULL;
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avformat_close_input(&pls->ctx);
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}
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av_free(pls);
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}
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av_freep(&c->playlists);
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av_freep(&c->cookies);
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av_freep(&c->user_agent);
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c->n_playlists = 0;
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}
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static void free_variant_list(HLSContext *c)
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{
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int i;
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for (i = 0; i < c->n_variants; i++) {
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struct variant *var = c->variants[i];
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av_freep(&var->playlists);
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av_free(var);
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}
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av_freep(&c->variants);
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c->n_variants = 0;
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}
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static void free_rendition_list(HLSContext *c)
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{
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int i;
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for (i = 0; i < c->n_renditions; i++)
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av_freep(&c->renditions[i]);
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av_freep(&c->renditions);
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c->n_renditions = 0;
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}
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/*
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* Used to reset a statically allocated AVPacket to a clean slate,
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* containing no data.
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*/
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static void reset_packet(AVPacket *pkt)
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{
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av_init_packet(pkt);
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pkt->data = NULL;
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}
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static struct playlist *new_playlist(HLSContext *c, const char *url,
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const char *base)
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{
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struct playlist *pls = av_mallocz(sizeof(struct playlist));
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if (!pls)
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return NULL;
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reset_packet(&pls->pkt);
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ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
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pls->seek_timestamp = AV_NOPTS_VALUE;
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pls->is_id3_timestamped = -1;
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pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
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dynarray_add(&c->playlists, &c->n_playlists, pls);
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return pls;
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}
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struct variant_info {
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char bandwidth[20];
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/* variant group ids: */
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char audio[MAX_FIELD_LEN];
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char video[MAX_FIELD_LEN];
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char subtitles[MAX_FIELD_LEN];
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};
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static struct variant *new_variant(HLSContext *c, struct variant_info *info,
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const char *url, const char *base)
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{
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struct variant *var;
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struct playlist *pls;
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pls = new_playlist(c, url, base);
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if (!pls)
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return NULL;
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var = av_mallocz(sizeof(struct variant));
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if (!var)
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return NULL;
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if (info) {
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var->bandwidth = atoi(info->bandwidth);
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strcpy(var->audio_group, info->audio);
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strcpy(var->video_group, info->video);
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strcpy(var->subtitles_group, info->subtitles);
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}
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dynarray_add(&c->variants, &c->n_variants, var);
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dynarray_add(&var->playlists, &var->n_playlists, pls);
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return var;
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}
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static void handle_variant_args(struct variant_info *info, const char *key,
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int key_len, char **dest, int *dest_len)
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{
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if (!strncmp(key, "BANDWIDTH=", key_len)) {
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*dest = info->bandwidth;
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*dest_len = sizeof(info->bandwidth);
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} else if (!strncmp(key, "AUDIO=", key_len)) {
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*dest = info->audio;
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*dest_len = sizeof(info->audio);
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} else if (!strncmp(key, "VIDEO=", key_len)) {
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*dest = info->video;
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*dest_len = sizeof(info->video);
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} else if (!strncmp(key, "SUBTITLES=", key_len)) {
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*dest = info->subtitles;
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*dest_len = sizeof(info->subtitles);
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}
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}
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struct key_info {
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char uri[MAX_URL_SIZE];
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char method[11];
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char iv[35];
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};
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static void handle_key_args(struct key_info *info, const char *key,
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int key_len, char **dest, int *dest_len)
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{
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if (!strncmp(key, "METHOD=", key_len)) {
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*dest = info->method;
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*dest_len = sizeof(info->method);
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} else if (!strncmp(key, "URI=", key_len)) {
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*dest = info->uri;
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*dest_len = sizeof(info->uri);
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} else if (!strncmp(key, "IV=", key_len)) {
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*dest = info->iv;
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*dest_len = sizeof(info->iv);
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}
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}
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struct rendition_info {
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char type[16];
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char uri[MAX_URL_SIZE];
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char group_id[MAX_FIELD_LEN];
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char language[MAX_FIELD_LEN];
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char assoc_language[MAX_FIELD_LEN];
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char name[MAX_FIELD_LEN];
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char defaultr[4];
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char forced[4];
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char characteristics[MAX_CHARACTERISTICS_LEN];
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};
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static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
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const char *url_base)
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{
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struct rendition *rend;
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enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
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char *characteristic;
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char *chr_ptr;
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char *saveptr;
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if (!strcmp(info->type, "AUDIO"))
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type = AVMEDIA_TYPE_AUDIO;
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else if (!strcmp(info->type, "VIDEO"))
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type = AVMEDIA_TYPE_VIDEO;
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else if (!strcmp(info->type, "SUBTITLES"))
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type = AVMEDIA_TYPE_SUBTITLE;
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else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
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/* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
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* AVC SEI RBSP anyway */
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return NULL;
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if (type == AVMEDIA_TYPE_UNKNOWN)
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return NULL;
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/* URI is mandatory for subtitles as per spec */
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if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
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return NULL;
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/* TODO: handle subtitles (each segment has to parsed separately) */
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if (type == AVMEDIA_TYPE_SUBTITLE)
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return NULL;
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rend = av_mallocz(sizeof(struct rendition));
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if (!rend)
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return NULL;
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dynarray_add(&c->renditions, &c->n_renditions, rend);
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rend->type = type;
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strcpy(rend->group_id, info->group_id);
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strcpy(rend->language, info->language);
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strcpy(rend->name, info->name);
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/* add the playlist if this is an external rendition */
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if (info->uri[0]) {
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rend->playlist = new_playlist(c, info->uri, url_base);
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if (rend->playlist)
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dynarray_add(&rend->playlist->renditions,
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&rend->playlist->n_renditions, rend);
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}
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if (info->assoc_language[0]) {
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int langlen = strlen(rend->language);
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if (langlen < sizeof(rend->language) - 3) {
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rend->language[langlen] = ',';
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strncpy(rend->language + langlen + 1, info->assoc_language,
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sizeof(rend->language) - langlen - 2);
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}
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}
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if (!strcmp(info->defaultr, "YES"))
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rend->disposition |= AV_DISPOSITION_DEFAULT;
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if (!strcmp(info->forced, "YES"))
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rend->disposition |= AV_DISPOSITION_FORCED;
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chr_ptr = info->characteristics;
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while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
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if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
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rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
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else if (!strcmp(characteristic, "public.accessibility.describes-video"))
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rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
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chr_ptr = NULL;
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}
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return rend;
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}
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static void handle_rendition_args(struct rendition_info *info, const char *key,
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int key_len, char **dest, int *dest_len)
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{
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if (!strncmp(key, "TYPE=", key_len)) {
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*dest = info->type;
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*dest_len = sizeof(info->type);
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} else if (!strncmp(key, "URI=", key_len)) {
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*dest = info->uri;
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*dest_len = sizeof(info->uri);
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} else if (!strncmp(key, "GROUP-ID=", key_len)) {
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*dest = info->group_id;
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*dest_len = sizeof(info->group_id);
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} else if (!strncmp(key, "LANGUAGE=", key_len)) {
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*dest = info->language;
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*dest_len = sizeof(info->language);
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} else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
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*dest = info->assoc_language;
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*dest_len = sizeof(info->assoc_language);
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} else if (!strncmp(key, "NAME=", key_len)) {
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*dest = info->name;
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*dest_len = sizeof(info->name);
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} else if (!strncmp(key, "DEFAULT=", key_len)) {
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*dest = info->defaultr;
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*dest_len = sizeof(info->defaultr);
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} else if (!strncmp(key, "FORCED=", key_len)) {
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*dest = info->forced;
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*dest_len = sizeof(info->forced);
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} else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
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*dest = info->characteristics;
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*dest_len = sizeof(info->characteristics);
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}
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/*
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* ignored:
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* - AUTOSELECT: client may autoselect based on e.g. system language
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* - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
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*/
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}
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|
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/* used by parse_playlist to allocate a new variant+playlist when the
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* playlist is detected to be a Media Playlist (not Master Playlist)
|
|
* and we have no parent Master Playlist (parsing of which would have
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* allocated the variant and playlist already) */
|
|
static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
|
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{
|
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if (*pls)
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return 0;
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if (!new_variant(c, NULL, url, NULL))
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return AVERROR(ENOMEM);
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*pls = c->playlists[c->n_playlists - 1];
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return 0;
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}
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|
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/* pls = NULL => Master Playlist or parentless Media Playlist
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* pls = !NULL => parented Media Playlist, playlist+variant allocated */
|
|
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];
|
|
|
|
if (!in) {
|
|
AVDictionary *opts = NULL;
|
|
close_in = 1;
|
|
/* Some HLS servers don't like being sent the range header */
|
|
av_dict_set(&opts, "seekable", "0", 0);
|
|
|
|
// broker prior HTTP options that should be consistent across requests
|
|
av_dict_set(&opts, "user-agent", c->user_agent, 0);
|
|
av_dict_set(&opts, "cookies", c->cookies, 0);
|
|
av_dict_set(&opts, "headers", c->headers, 0);
|
|
|
|
ret = avio_open2(&in, url, AVIO_FLAG_READ,
|
|
c->interrupt_callback, &opts);
|
|
av_dict_free(&opts);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
|
|
url = new_url;
|
|
|
|
read_chomp_line(in, line, sizeof(line));
|
|
if (strcmp(line, "#EXTM3U")) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
|
|
if (pls) {
|
|
free_segment_list(pls);
|
|
pls->finished = 0;
|
|
pls->type = PLS_TYPE_UNSPECIFIED;
|
|
}
|
|
while (!avio_feof(in)) {
|
|
read_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 (!strncmp(info.iv, "0x", 2) || !strncmp(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)) {
|
|
ret = ensure_playlist(c, &pls, url);
|
|
if (ret < 0)
|
|
goto fail;
|
|
pls->target_duration = atoi(ptr) * AV_TIME_BASE;
|
|
} else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
|
|
ret = ensure_playlist(c, &pls, url);
|
|
if (ret < 0)
|
|
goto fail;
|
|
pls->start_seq_no = atoi(ptr);
|
|
} 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-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 = atoi(ptr);
|
|
ptr = strchr(ptr, '@');
|
|
if (ptr)
|
|
seg_offset = atoi(ptr+1);
|
|
} else if (av_strstart(line, "#", NULL)) {
|
|
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;
|
|
if (!pls) {
|
|
if (!new_variant(c, 0, url, NULL)) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
pls = c->playlists[c->n_playlists - 1];
|
|
}
|
|
seg = av_malloc(sizeof(struct segment));
|
|
if (!seg) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
seg->duration = duration;
|
|
seg->key_type = key_type;
|
|
if (has_iv) {
|
|
memcpy(seg->iv, iv, sizeof(iv));
|
|
} else {
|
|
int seq = pls->start_seq_no + pls->n_segments;
|
|
memset(seg->iv, 0, sizeof(seg->iv));
|
|
AV_WB32(seg->iv + 12, seq);
|
|
}
|
|
|
|
if (key_type != KEY_NONE) {
|
|
ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
|
|
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);
|
|
seg->url = av_strdup(tmp_str);
|
|
if (!seg->url) {
|
|
av_free(seg->key);
|
|
av_free(seg);
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (pls)
|
|
pls->last_load_time = av_gettime_relative();
|
|
|
|
fail:
|
|
av_free(new_url);
|
|
if (close_in)
|
|
avio_close(in);
|
|
return ret;
|
|
}
|
|
|
|
enum ReadFromURLMode {
|
|
READ_NORMAL,
|
|
READ_COMPLETE,
|
|
};
|
|
|
|
/* read from URLContext, limiting read to current segment */
|
|
static int read_from_url(struct playlist *pls, uint8_t *buf, int buf_size,
|
|
enum ReadFromURLMode mode)
|
|
{
|
|
int ret;
|
|
struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
|
|
|
|
/* 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);
|
|
|
|
if (mode == READ_COMPLETE)
|
|
ret = ffurl_read_complete(pls->input, buf, buf_size);
|
|
else
|
|
ret = ffurl_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,
|
|
ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
|
|
{
|
|
static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
|
|
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;
|
|
if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
|
|
/* 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 (!strcmp(meta->tag, "APIC") && apic)
|
|
*apic = meta->data;
|
|
}
|
|
}
|
|
|
|
/* Check if the ID3 metadata contents have changed */
|
|
static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
|
|
ID3v2ExtraMetaAPIC *apic)
|
|
{
|
|
AVDictionaryEntry *entry = NULL;
|
|
AVDictionaryEntry *oldentry;
|
|
/* check that no keys have changed values */
|
|
while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
|
|
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 - FF_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, ×tamp, &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;
|
|
|
|
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->ctx, "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);
|
|
}
|
|
|
|
/* Intercept and handle ID3 tags between URLContext and AVIOContext */
|
|
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;
|
|
|
|
/* 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, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE);
|
|
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)) {
|
|
struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
|
|
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->ctx, 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->ctx, 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, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
|
|
break;
|
|
id3_buf_pos += remaining;
|
|
av_log(pls->ctx, 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, buf + *len, buf_size - *len, READ_NORMAL);
|
|
|
|
/* 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 */
|
|
AVIOContext id3ioctx;
|
|
ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
|
|
handle_id3(&id3ioctx, pls);
|
|
}
|
|
|
|
if (pls->is_id3_timestamped == -1)
|
|
pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
|
|
}
|
|
|
|
static void update_options(char **dest, const char *name, void *src)
|
|
{
|
|
av_freep(dest);
|
|
av_opt_get(src, name, 0, (uint8_t**)dest);
|
|
if (*dest && !strlen(*dest))
|
|
av_freep(dest);
|
|
}
|
|
|
|
static int open_input(HLSContext *c, struct playlist *pls)
|
|
{
|
|
AVDictionary *opts = NULL;
|
|
AVDictionary *opts2 = NULL;
|
|
int ret;
|
|
struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no];
|
|
|
|
// broker prior HTTP options that should be consistent across requests
|
|
av_dict_set(&opts, "user-agent", c->user_agent, 0);
|
|
av_dict_set(&opts, "cookies", c->cookies, 0);
|
|
av_dict_set(&opts, "headers", c->headers, 0);
|
|
av_dict_set(&opts, "seekable", "0", 0);
|
|
|
|
// Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice)
|
|
av_dict_copy(&opts2, opts, 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_NONE) {
|
|
ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ,
|
|
&pls->parent->interrupt_callback, &opts);
|
|
|
|
} else if (seg->key_type == KEY_AES_128) {
|
|
char iv[33], key[33], url[MAX_URL_SIZE];
|
|
if (strcmp(seg->key, pls->key_url)) {
|
|
URLContext *uc;
|
|
if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
|
|
&pls->parent->interrupt_callback, &opts2) == 0) {
|
|
if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
|
|
!= sizeof(pls->key)) {
|
|
av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
|
|
seg->key);
|
|
}
|
|
update_options(&c->cookies, "cookies", uc->priv_data);
|
|
av_dict_set(&opts, "cookies", c->cookies, 0);
|
|
ffurl_close(uc);
|
|
} else {
|
|
av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
|
|
seg->key);
|
|
}
|
|
av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
|
|
}
|
|
ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
|
|
ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
|
|
iv[32] = key[32] = '\0';
|
|
if (strstr(seg->url, "://"))
|
|
snprintf(url, sizeof(url), "crypto+%s", seg->url);
|
|
else
|
|
snprintf(url, sizeof(url), "crypto:%s", seg->url);
|
|
if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ,
|
|
&pls->parent->interrupt_callback)) < 0)
|
|
goto cleanup;
|
|
av_opt_set(pls->input->priv_data, "key", key, 0);
|
|
av_opt_set(pls->input->priv_data, "iv", iv, 0);
|
|
|
|
if ((ret = ffurl_connect(pls->input, &opts)) < 0) {
|
|
ffurl_close(pls->input);
|
|
pls->input = NULL;
|
|
goto cleanup;
|
|
}
|
|
ret = 0;
|
|
} else if (seg->key_type == KEY_SAMPLE_AES) {
|
|
av_log(pls->parent, AV_LOG_ERROR,
|
|
"SAMPLE-AES encryption is not supported yet\n");
|
|
ret = AVERROR_PATCHWELCOME;
|
|
}
|
|
else
|
|
ret = AVERROR(ENOSYS);
|
|
|
|
/* 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. */
|
|
if (ret == 0 && seg->key_type == KEY_NONE) {
|
|
int seekret = ffurl_seek(pls->input, 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;
|
|
ffurl_close(pls->input);
|
|
pls->input = NULL;
|
|
}
|
|
}
|
|
|
|
cleanup:
|
|
av_dict_free(&opts);
|
|
av_dict_free(&opts2);
|
|
pls->cur_seg_offset = 0;
|
|
return ret;
|
|
}
|
|
|
|
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 read_data(void *opaque, uint8_t *buf, int buf_size)
|
|
{
|
|
struct playlist *v = opaque;
|
|
HLSContext *c = v->parent->priv_data;
|
|
int ret, i;
|
|
int just_opened = 0;
|
|
|
|
restart:
|
|
if (!v->needed)
|
|
return AVERROR_EOF;
|
|
|
|
if (!v->input) {
|
|
int64_t reload_interval;
|
|
|
|
/* Check that the playlist is still needed before opening a new
|
|
* segment. */
|
|
if (v->ctx && v->ctx->nb_streams &&
|
|
v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
|
|
v->needed = 0;
|
|
for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
|
|
i++) {
|
|
if (v->parent->streams[i]->discard < AVDISCARD_ALL)
|
|
v->needed = 1;
|
|
}
|
|
}
|
|
if (!v->needed) {
|
|
av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
|
|
v->index);
|
|
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:
|
|
if (!v->finished &&
|
|
av_gettime_relative() - v->last_load_time >= reload_interval) {
|
|
if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
|
|
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(NULL, AV_LOG_WARNING,
|
|
"skipping %d 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->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;
|
|
}
|
|
|
|
ret = open_input(c, v);
|
|
if (ret < 0) {
|
|
av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
|
|
v->index);
|
|
return ret;
|
|
}
|
|
just_opened = 1;
|
|
}
|
|
|
|
ret = read_from_url(v, buf, buf_size, READ_NORMAL);
|
|
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;
|
|
}
|
|
ffurl_close(v->input);
|
|
v->input = NULL;
|
|
v->cur_seq_no++;
|
|
|
|
c->cur_seq_no = v->cur_seq_no;
|
|
|
|
goto restart;
|
|
}
|
|
|
|
static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls)
|
|
{
|
|
int variant_count = 0;
|
|
int i, j;
|
|
|
|
for (i = 0; i < c->n_variants && variant_count < 2; i++) {
|
|
struct variant *v = c->variants[i];
|
|
|
|
for (j = 0; j < v->n_playlists; j++) {
|
|
if (v->playlists[j] == pls) {
|
|
variant_count++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return variant_count >= 2;
|
|
}
|
|
|
|
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->ctx->nb_streams; i++) {
|
|
AVStream *st = s->streams[pls->stream_offset + i];
|
|
|
|
if (st->codec->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, int *seq_no)
|
|
{
|
|
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;
|
|
return 1;
|
|
}
|
|
pos += pls->segments[i]->duration;
|
|
}
|
|
|
|
*seq_no = pls->start_seq_no + pls->n_segments - 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
|
|
{
|
|
int 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);
|
|
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 with more than 3 segments, start at the
|
|
* third last segment. */
|
|
if (pls->n_segments > 3)
|
|
return pls->start_seq_no + pls->n_segments - 3;
|
|
}
|
|
|
|
/* Otherwise just start on the first segment. */
|
|
return pls->start_seq_no;
|
|
}
|
|
|
|
static int hls_read_header(AVFormatContext *s)
|
|
{
|
|
URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
|
|
HLSContext *c = s->priv_data;
|
|
int ret = 0, i, j, stream_offset = 0;
|
|
|
|
c->interrupt_callback = &s->interrupt_callback;
|
|
|
|
c->first_packet = 1;
|
|
c->first_timestamp = AV_NOPTS_VALUE;
|
|
c->cur_timestamp = AV_NOPTS_VALUE;
|
|
|
|
// if the URL context is good, read important options we must broker later
|
|
if (u && u->prot->priv_data_class) {
|
|
// get the previous user agent & set back to null if string size is zero
|
|
update_options(&c->user_agent, "user-agent", u->priv_data);
|
|
|
|
// get the previous cookies & set back to null if string size is zero
|
|
update_options(&c->cookies, "cookies", u->priv_data);
|
|
|
|
// get the previous headers & set back to null if string size is zero
|
|
update_options(&c->headers, "headers", u->priv_data);
|
|
}
|
|
|
|
if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
|
|
goto fail;
|
|
|
|
if (c->n_variants == 0) {
|
|
av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
|
|
ret = AVERROR_EOF;
|
|
goto fail;
|
|
}
|
|
/* 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];
|
|
if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (c->variants[0]->playlists[0]->n_segments == 0) {
|
|
av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
|
|
ret = AVERROR_EOF;
|
|
goto fail;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* Open the demuxer for each playlist */
|
|
for (i = 0; i < c->n_playlists; i++) {
|
|
struct playlist *pls = c->playlists[i];
|
|
AVInputFormat *in_fmt = NULL;
|
|
|
|
if (!(pls->ctx = avformat_alloc_context())) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
if (pls->n_segments == 0)
|
|
continue;
|
|
|
|
pls->index = i;
|
|
pls->needed = 1;
|
|
pls->parent = s;
|
|
pls->cur_seq_no = select_cur_seq_no(c, pls);
|
|
|
|
pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
|
|
ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
|
|
read_data, NULL, NULL);
|
|
pls->pb.seekable = 0;
|
|
ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->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", pls->segments[0]->url);
|
|
avformat_free_context(pls->ctx);
|
|
pls->ctx = NULL;
|
|
goto fail;
|
|
}
|
|
pls->ctx->pb = &pls->pb;
|
|
pls->stream_offset = stream_offset;
|
|
|
|
if ((ret = ff_copy_whitelists(pls->ctx, s)) < 0)
|
|
goto fail;
|
|
|
|
ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
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_free_extra_meta(&pls->id3_deferred_extra);
|
|
pls->id3_deferred_extra = NULL;
|
|
}
|
|
|
|
pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
|
|
ret = avformat_find_stream_info(pls->ctx, NULL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
if (pls->is_id3_timestamped == -1)
|
|
av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
|
|
|
|
/* Create new AVStreams for each stream in this playlist */
|
|
for (j = 0; j < pls->ctx->nb_streams; j++) {
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
AVStream *ist = pls->ctx->streams[j];
|
|
if (!st) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
st->id = i;
|
|
|
|
avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
|
|
stream_offset += pls->ctx->nb_streams;
|
|
}
|
|
|
|
/* 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)
|
|
goto fail;
|
|
av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
|
|
|
|
for (j = 0; j < v->n_playlists; j++) {
|
|
struct playlist *pls = v->playlists[j];
|
|
int is_shared = playlist_in_multiple_variants(c, pls);
|
|
int k;
|
|
|
|
for (k = 0; k < pls->ctx->nb_streams; k++) {
|
|
struct AVStream *st = s->streams[pls->stream_offset + k];
|
|
|
|
ff_program_add_stream_index(s, i, pls->stream_offset + k);
|
|
|
|
/* Set variant_bitrate for streams unique to this variant */
|
|
if (!is_shared && v->bandwidth)
|
|
av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
fail:
|
|
free_playlist_list(c);
|
|
free_variant_list(c);
|
|
free_rendition_list(c);
|
|
return ret;
|
|
}
|
|
|
|
static int recheck_discard_flags(AVFormatContext *s, int first)
|
|
{
|
|
HLSContext *c = s->priv_data;
|
|
int i, changed = 0;
|
|
|
|
/* Check if any new streams are needed */
|
|
for (i = 0; i < c->n_playlists; i++)
|
|
c->playlists[i]->cur_needed = 0;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
struct playlist *pls = c->playlists[s->streams[i]->id];
|
|
if (st->discard < AVDISCARD_ALL)
|
|
pls->cur_needed = 1;
|
|
}
|
|
for (i = 0; i < c->n_playlists; i++) {
|
|
struct playlist *pls = c->playlists[i];
|
|
if (pls->cur_needed && !pls->needed) {
|
|
pls->needed = 1;
|
|
changed = 1;
|
|
pls->cur_seq_no = select_cur_seq_no(c, pls);
|
|
pls->pb.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 %d\n", i, pls->cur_seq_no);
|
|
} else if (first && !pls->cur_needed && pls->needed) {
|
|
if (pls->input)
|
|
ffurl_close(pls->input);
|
|
pls->input = NULL;
|
|
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);
|
|
|
|
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;
|
|
ret = av_read_frame(pls->ctx, &pls->pkt);
|
|
if (ret < 0) {
|
|
if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
|
|
return ret;
|
|
reset_packet(&pls->pkt);
|
|
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);
|
|
}
|
|
|
|
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_free_packet(&pls->pkt);
|
|
reset_packet(&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];
|
|
*pkt = pls->pkt;
|
|
pkt->stream_index += pls->stream_offset;
|
|
reset_packet(&c->playlists[minplaylist]->pkt);
|
|
|
|
if (pkt->dts != AV_NOPTS_VALUE)
|
|
c->cur_timestamp = av_rescale_q(pkt->dts,
|
|
pls->ctx->streams[pls->pkt.stream_index]->time_base,
|
|
AV_TIME_BASE_Q);
|
|
|
|
return 0;
|
|
}
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
static int hls_close(AVFormatContext *s)
|
|
{
|
|
HLSContext *c = s->priv_data;
|
|
|
|
free_playlist_list(c);
|
|
free_variant_list(c);
|
|
free_rendition_list(c);
|
|
return 0;
|
|
}
|
|
|
|
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, seq_no;
|
|
int64_t first_timestamp, seek_timestamp, duration;
|
|
|
|
if ((flags & AVSEEK_FLAG_BYTE) ||
|
|
!(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
|
|
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,
|
|
flags & AVSEEK_FLAG_BACKWARD ?
|
|
AV_ROUND_DOWN : AV_ROUND_UP);
|
|
|
|
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];
|
|
if (stream_index >= pls->stream_offset &&
|
|
stream_index - pls->stream_offset < pls->ctx->nb_streams) {
|
|
seek_pls = pls;
|
|
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))
|
|
return AVERROR(EIO);
|
|
|
|
/* 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_index - seek_pls->stream_offset;
|
|
|
|
for (i = 0; i < c->n_playlists; i++) {
|
|
/* Reset reading */
|
|
struct playlist *pls = c->playlists[i];
|
|
if (pls->input) {
|
|
ffurl_close(pls->input);
|
|
pls->input = NULL;
|
|
}
|
|
av_free_packet(&pls->pkt);
|
|
reset_packet(&pls->pkt);
|
|
pls->pb.eof_reached = 0;
|
|
/* Clear any buffered data */
|
|
pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
|
|
/* Reset the pos, to let the mpegts demuxer know we've seeked. */
|
|
pls->pb.pos = 0;
|
|
/* Flush the packet queue of the subdemuxer. */
|
|
ff_read_frame_flush(pls->ctx);
|
|
|
|
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);
|
|
/* 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(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:"))
|
|
return AVPROBE_SCORE_MAX;
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_hls_demuxer = {
|
|
.name = "hls,applehttp",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
|
|
.priv_data_size = sizeof(HLSContext),
|
|
.read_probe = hls_probe,
|
|
.read_header = hls_read_header,
|
|
.read_packet = hls_read_packet,
|
|
.read_close = hls_close,
|
|
.read_seek = hls_read_seek,
|
|
};
|