forked from KolibriOS/kolibrios
840 lines
28 KiB
C
840 lines
28 KiB
C
/*
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* Apple HTTP Live Streaming demuxer
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* Copyright (c) 2010 Martin Storsjo
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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/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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#define INITIAL_BUFFER_SIZE 32768
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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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};
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struct segment {
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int64_t duration;
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char url[MAX_URL_SIZE];
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char key[MAX_URL_SIZE];
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enum KeyType key_type;
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uint8_t iv[16];
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};
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/*
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* Each variant 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 variant {
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int bandwidth;
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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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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 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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};
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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 cur_seq_no;
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int end_of_segment;
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int first_packet;
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int64_t first_timestamp;
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int64_t seek_timestamp;
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int seek_flags;
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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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} 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 variant *var)
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{
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int i;
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for (i = 0; i < var->n_segments; i++)
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av_free(var->segments[i]);
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av_freep(&var->segments);
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var->n_segments = 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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free_segment_list(var);
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av_free_packet(&var->pkt);
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av_free(var->pb.buffer);
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if (var->input)
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ffurl_close(var->input);
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if (var->ctx) {
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var->ctx->pb = NULL;
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avformat_close_input(&var->ctx);
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}
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av_free(var);
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}
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av_freep(&c->variants);
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av_freep(&c->cookies);
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av_freep(&c->user_agent);
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c->n_variants = 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 variant *new_variant(HLSContext *c, int bandwidth,
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const char *url, const char *base)
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{
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struct variant *var = av_mallocz(sizeof(struct variant));
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if (!var)
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return NULL;
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reset_packet(&var->pkt);
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var->bandwidth = bandwidth;
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ff_make_absolute_url(var->url, sizeof(var->url), base, url);
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dynarray_add(&c->variants, &c->n_variants, var);
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return var;
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}
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struct variant_info {
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char bandwidth[20];
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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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}
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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[10];
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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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static int parse_playlist(HLSContext *c, const char *url,
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struct variant *var, AVIOContext *in)
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{
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int ret = 0, is_segment = 0, is_variant = 0, bandwidth = 0;
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int64_t duration = 0;
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enum KeyType key_type = KEY_NONE;
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uint8_t iv[16] = "";
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int has_iv = 0;
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char key[MAX_URL_SIZE] = "";
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char line[MAX_URL_SIZE];
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const char *ptr;
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int close_in = 0;
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if (!in) {
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AVDictionary *opts = NULL;
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close_in = 1;
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/* Some HLS servers don't like being sent the range header */
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av_dict_set(&opts, "seekable", "0", 0);
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// broker prior HTTP options that should be consistent across requests
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av_dict_set(&opts, "user-agent", c->user_agent, 0);
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av_dict_set(&opts, "cookies", c->cookies, 0);
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ret = avio_open2(&in, url, AVIO_FLAG_READ,
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c->interrupt_callback, &opts);
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av_dict_free(&opts);
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if (ret < 0)
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return ret;
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}
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read_chomp_line(in, line, sizeof(line));
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if (strcmp(line, "#EXTM3U")) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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if (var) {
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free_segment_list(var);
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var->finished = 0;
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}
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while (!url_feof(in)) {
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read_chomp_line(in, line, sizeof(line));
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if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
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struct variant_info info = {{0}};
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is_variant = 1;
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ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
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&info);
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bandwidth = atoi(info.bandwidth);
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} else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
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struct key_info info = {{0}};
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ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
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&info);
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key_type = KEY_NONE;
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has_iv = 0;
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if (!strcmp(info.method, "AES-128"))
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key_type = KEY_AES_128;
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if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
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ff_hex_to_data(iv, info.iv + 2);
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has_iv = 1;
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}
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av_strlcpy(key, info.uri, sizeof(key));
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} else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
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if (!var) {
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var = new_variant(c, 0, url, NULL);
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if (!var) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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}
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var->target_duration = atoi(ptr) * AV_TIME_BASE;
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} else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
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if (!var) {
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var = new_variant(c, 0, url, NULL);
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if (!var) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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}
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var->start_seq_no = atoi(ptr);
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} else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
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if (var)
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var->finished = 1;
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} else if (av_strstart(line, "#EXTINF:", &ptr)) {
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is_segment = 1;
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duration = atof(ptr) * AV_TIME_BASE;
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} else if (av_strstart(line, "#", NULL)) {
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continue;
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} else if (line[0]) {
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if (is_variant) {
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if (!new_variant(c, bandwidth, line, url)) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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is_variant = 0;
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bandwidth = 0;
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}
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if (is_segment) {
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struct segment *seg;
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if (!var) {
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var = new_variant(c, 0, url, NULL);
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if (!var) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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}
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seg = av_malloc(sizeof(struct segment));
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if (!seg) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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seg->duration = duration;
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seg->key_type = key_type;
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if (has_iv) {
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memcpy(seg->iv, iv, sizeof(iv));
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} else {
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int seq = var->start_seq_no + var->n_segments;
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memset(seg->iv, 0, sizeof(seg->iv));
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AV_WB32(seg->iv + 12, seq);
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}
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ff_make_absolute_url(seg->key, sizeof(seg->key), url, key);
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ff_make_absolute_url(seg->url, sizeof(seg->url), url, line);
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dynarray_add(&var->segments, &var->n_segments, seg);
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is_segment = 0;
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}
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}
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}
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if (var)
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var->last_load_time = av_gettime();
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fail:
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if (close_in)
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avio_close(in);
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return ret;
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}
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static int open_input(HLSContext *c, struct variant *var)
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{
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AVDictionary *opts = NULL;
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int ret;
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struct segment *seg = var->segments[var->cur_seq_no - var->start_seq_no];
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// broker prior HTTP options that should be consistent across requests
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av_dict_set(&opts, "user-agent", c->user_agent, 0);
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av_dict_set(&opts, "cookies", c->cookies, 0);
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av_dict_set(&opts, "seekable", "0", 0);
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if (seg->key_type == KEY_NONE) {
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ret = ffurl_open(&var->input, seg->url, AVIO_FLAG_READ,
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&var->parent->interrupt_callback, &opts);
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goto cleanup;
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} else if (seg->key_type == KEY_AES_128) {
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char iv[33], key[33], url[MAX_URL_SIZE];
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if (strcmp(seg->key, var->key_url)) {
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URLContext *uc;
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if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ,
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&var->parent->interrupt_callback, &opts) == 0) {
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if (ffurl_read_complete(uc, var->key, sizeof(var->key))
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!= sizeof(var->key)) {
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av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
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seg->key);
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}
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ffurl_close(uc);
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} else {
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av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
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seg->key);
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}
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av_strlcpy(var->key_url, seg->key, sizeof(var->key_url));
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}
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ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
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ff_data_to_hex(key, var->key, sizeof(var->key), 0);
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iv[32] = key[32] = '\0';
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if (strstr(seg->url, "://"))
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snprintf(url, sizeof(url), "crypto+%s", seg->url);
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else
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snprintf(url, sizeof(url), "crypto:%s", seg->url);
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if ((ret = ffurl_alloc(&var->input, url, AVIO_FLAG_READ,
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&var->parent->interrupt_callback)) < 0)
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goto cleanup;
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av_opt_set(var->input->priv_data, "key", key, 0);
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av_opt_set(var->input->priv_data, "iv", iv, 0);
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/* Need to repopulate options */
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av_dict_free(&opts);
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av_dict_set(&opts, "seekable", "0", 0);
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if ((ret = ffurl_connect(var->input, &opts)) < 0) {
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ffurl_close(var->input);
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var->input = NULL;
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goto cleanup;
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}
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ret = 0;
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}
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else
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ret = AVERROR(ENOSYS);
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cleanup:
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av_dict_free(&opts);
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return ret;
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}
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static int read_data(void *opaque, uint8_t *buf, int buf_size)
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{
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struct variant *v = opaque;
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HLSContext *c = v->parent->priv_data;
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int ret, i;
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restart:
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if (!v->input) {
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/* If this is a live stream and the reload interval has elapsed since
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* the last playlist reload, reload the variant playlists now. */
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int64_t reload_interval = v->n_segments > 0 ?
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v->segments[v->n_segments - 1]->duration :
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v->target_duration;
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reload:
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if (!v->finished &&
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av_gettime() - v->last_load_time >= reload_interval) {
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if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
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return ret;
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/* If we need to reload the playlist again below (if
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* there's still no more segments), switch to a reload
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* interval of half the target duration. */
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reload_interval = v->target_duration / 2;
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}
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if (v->cur_seq_no < v->start_seq_no) {
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av_log(NULL, AV_LOG_WARNING,
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"skipping %d segments ahead, expired from playlists\n",
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v->start_seq_no - v->cur_seq_no);
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v->cur_seq_no = v->start_seq_no;
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}
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if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
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if (v->finished)
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return AVERROR_EOF;
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while (av_gettime() - v->last_load_time < reload_interval) {
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if (ff_check_interrupt(c->interrupt_callback))
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return AVERROR_EXIT;
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av_usleep(100*1000);
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}
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/* Enough time has elapsed since the last reload */
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goto reload;
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}
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ret = open_input(c, v);
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if (ret < 0)
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return ret;
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}
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ret = ffurl_read(v->input, buf, buf_size);
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if (ret > 0)
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return ret;
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ffurl_close(v->input);
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v->input = NULL;
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v->cur_seq_no++;
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c->end_of_segment = 1;
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c->cur_seq_no = v->cur_seq_no;
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if (v->ctx && v->ctx->nb_streams &&
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v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) {
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v->needed = 0;
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for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
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i++) {
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if (v->parent->streams[i]->discard < AVDISCARD_ALL)
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v->needed = 1;
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}
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}
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if (!v->needed) {
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av_log(v->parent, AV_LOG_INFO, "No longer receiving variant %d\n",
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v->index);
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return AVERROR_EOF;
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}
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goto restart;
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}
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static int hls_read_header(AVFormatContext *s)
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{
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URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
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HLSContext *c = s->priv_data;
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int ret = 0, i, j, stream_offset = 0;
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c->interrupt_callback = &s->interrupt_callback;
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// if the URL context is good, read important options we must broker later
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if (u && u->prot->priv_data_class) {
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// get the previous user agent & set back to null if string size is zero
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av_freep(&c->user_agent);
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av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent));
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if (c->user_agent && !strlen(c->user_agent))
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av_freep(&c->user_agent);
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// get the previous cookies & set back to null if string size is zero
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av_freep(&c->cookies);
|
|
av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies));
|
|
if (c->cookies && !strlen(c->cookies))
|
|
av_freep(&c->cookies);
|
|
}
|
|
|
|
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 variants, parse each individual
|
|
* variant playlist. */
|
|
if (c->n_variants > 1 || c->variants[0]->n_segments == 0) {
|
|
for (i = 0; i < c->n_variants; i++) {
|
|
struct variant *v = c->variants[i];
|
|
if ((ret = parse_playlist(c, v->url, v, NULL)) < 0)
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (c->variants[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]->finished) {
|
|
int64_t duration = 0;
|
|
for (i = 0; i < c->variants[0]->n_segments; i++)
|
|
duration += c->variants[0]->segments[i]->duration;
|
|
s->duration = duration;
|
|
}
|
|
|
|
/* Open the demuxer for each variant */
|
|
for (i = 0; i < c->n_variants; i++) {
|
|
struct variant *v = c->variants[i];
|
|
AVInputFormat *in_fmt = NULL;
|
|
char bitrate_str[20];
|
|
AVProgram *program;
|
|
|
|
if (v->n_segments == 0)
|
|
continue;
|
|
|
|
if (!(v->ctx = avformat_alloc_context())) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
v->index = i;
|
|
v->needed = 1;
|
|
v->parent = s;
|
|
|
|
/* If this is a live stream with more than 3 segments, start at the
|
|
* third last segment. */
|
|
v->cur_seq_no = v->start_seq_no;
|
|
if (!v->finished && v->n_segments > 3)
|
|
v->cur_seq_no = v->start_seq_no + v->n_segments - 3;
|
|
|
|
v->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
|
|
ffio_init_context(&v->pb, v->read_buffer, INITIAL_BUFFER_SIZE, 0, v,
|
|
read_data, NULL, NULL);
|
|
v->pb.seekable = 0;
|
|
ret = av_probe_input_buffer(&v->pb, &in_fmt, v->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", v->segments[0]->url);
|
|
avformat_free_context(v->ctx);
|
|
v->ctx = NULL;
|
|
goto fail;
|
|
}
|
|
v->ctx->pb = &v->pb;
|
|
v->stream_offset = stream_offset;
|
|
ret = avformat_open_input(&v->ctx, v->segments[0]->url, in_fmt, NULL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
v->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
|
|
ret = avformat_find_stream_info(v->ctx, NULL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth);
|
|
|
|
program = av_new_program(s, i);
|
|
if (!program)
|
|
goto fail;
|
|
av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0);
|
|
|
|
/* Create new AVStreams for each stream in this variant */
|
|
for (j = 0; j < v->ctx->nb_streams; j++) {
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
AVStream *ist = v->ctx->streams[j];
|
|
if (!st) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
ff_program_add_stream_index(s, i, stream_offset + j);
|
|
st->id = i;
|
|
avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
|
|
avcodec_copy_context(st->codec, v->ctx->streams[j]->codec);
|
|
if (v->bandwidth)
|
|
av_dict_set(&st->metadata, "variant_bitrate", bitrate_str,
|
|
0);
|
|
}
|
|
stream_offset += v->ctx->nb_streams;
|
|
}
|
|
|
|
c->first_packet = 1;
|
|
c->first_timestamp = AV_NOPTS_VALUE;
|
|
c->seek_timestamp = AV_NOPTS_VALUE;
|
|
|
|
return 0;
|
|
fail:
|
|
free_variant_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_variants; i++)
|
|
c->variants[i]->cur_needed = 0;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
struct variant *var = c->variants[s->streams[i]->id];
|
|
if (st->discard < AVDISCARD_ALL)
|
|
var->cur_needed = 1;
|
|
}
|
|
for (i = 0; i < c->n_variants; i++) {
|
|
struct variant *v = c->variants[i];
|
|
if (v->cur_needed && !v->needed) {
|
|
v->needed = 1;
|
|
changed = 1;
|
|
v->cur_seq_no = c->cur_seq_no;
|
|
v->pb.eof_reached = 0;
|
|
av_log(s, AV_LOG_INFO, "Now receiving variant %d\n", i);
|
|
} else if (first && !v->cur_needed && v->needed) {
|
|
if (v->input)
|
|
ffurl_close(v->input);
|
|
v->input = NULL;
|
|
v->needed = 0;
|
|
changed = 1;
|
|
av_log(s, AV_LOG_INFO, "No longer receiving variant %d\n", i);
|
|
}
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
HLSContext *c = s->priv_data;
|
|
int ret, i, minvariant = -1;
|
|
|
|
if (c->first_packet) {
|
|
recheck_discard_flags(s, 1);
|
|
c->first_packet = 0;
|
|
}
|
|
|
|
start:
|
|
c->end_of_segment = 0;
|
|
for (i = 0; i < c->n_variants; i++) {
|
|
struct variant *var = c->variants[i];
|
|
/* Make sure we've got one buffered packet from each open variant
|
|
* stream */
|
|
if (var->needed && !var->pkt.data) {
|
|
while (1) {
|
|
int64_t ts_diff;
|
|
AVStream *st;
|
|
ret = av_read_frame(var->ctx, &var->pkt);
|
|
if (ret < 0) {
|
|
if (!url_feof(&var->pb) && ret != AVERROR_EOF)
|
|
return ret;
|
|
reset_packet(&var->pkt);
|
|
break;
|
|
} else {
|
|
if (c->first_timestamp == AV_NOPTS_VALUE &&
|
|
var->pkt.dts != AV_NOPTS_VALUE)
|
|
c->first_timestamp = av_rescale_q(var->pkt.dts,
|
|
var->ctx->streams[var->pkt.stream_index]->time_base,
|
|
AV_TIME_BASE_Q);
|
|
}
|
|
|
|
if (c->seek_timestamp == AV_NOPTS_VALUE)
|
|
break;
|
|
|
|
if (var->pkt.dts == AV_NOPTS_VALUE) {
|
|
c->seek_timestamp = AV_NOPTS_VALUE;
|
|
break;
|
|
}
|
|
|
|
st = var->ctx->streams[var->pkt.stream_index];
|
|
ts_diff = av_rescale_rnd(var->pkt.dts, AV_TIME_BASE,
|
|
st->time_base.den, AV_ROUND_DOWN) -
|
|
c->seek_timestamp;
|
|
if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY ||
|
|
var->pkt.flags & AV_PKT_FLAG_KEY)) {
|
|
c->seek_timestamp = AV_NOPTS_VALUE;
|
|
break;
|
|
}
|
|
av_free_packet(&var->pkt);
|
|
reset_packet(&var->pkt);
|
|
}
|
|
}
|
|
/* Check if this stream still is on an earlier segment number, or
|
|
* has the packet with the lowest dts */
|
|
if (var->pkt.data) {
|
|
struct variant *minvar = c->variants[minvariant];
|
|
if (minvariant < 0 || var->cur_seq_no < minvar->cur_seq_no) {
|
|
minvariant = i;
|
|
} else if (var->cur_seq_no == minvar->cur_seq_no) {
|
|
int64_t dts = var->pkt.dts;
|
|
int64_t mindts = minvar->pkt.dts;
|
|
AVStream *st = var->ctx->streams[var->pkt.stream_index];
|
|
AVStream *minst = minvar->ctx->streams[minvar->pkt.stream_index];
|
|
|
|
if (dts == AV_NOPTS_VALUE) {
|
|
minvariant = i;
|
|
} else if (mindts != AV_NOPTS_VALUE) {
|
|
if (st->start_time != AV_NOPTS_VALUE)
|
|
dts -= st->start_time;
|
|
if (minst->start_time != AV_NOPTS_VALUE)
|
|
mindts -= minst->start_time;
|
|
|
|
if (av_compare_ts(dts, st->time_base,
|
|
mindts, minst->time_base) < 0)
|
|
minvariant = i;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (c->end_of_segment) {
|
|
if (recheck_discard_flags(s, 0))
|
|
goto start;
|
|
}
|
|
/* If we got a packet, return it */
|
|
if (minvariant >= 0) {
|
|
*pkt = c->variants[minvariant]->pkt;
|
|
pkt->stream_index += c->variants[minvariant]->stream_offset;
|
|
reset_packet(&c->variants[minvariant]->pkt);
|
|
return 0;
|
|
}
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
static int hls_close(AVFormatContext *s)
|
|
{
|
|
HLSContext *c = s->priv_data;
|
|
|
|
free_variant_list(c);
|
|
return 0;
|
|
}
|
|
|
|
static int hls_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
HLSContext *c = s->priv_data;
|
|
int i, j, ret;
|
|
|
|
if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->finished)
|
|
return AVERROR(ENOSYS);
|
|
|
|
c->seek_flags = flags;
|
|
c->seek_timestamp = stream_index < 0 ? 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);
|
|
timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, stream_index >= 0 ?
|
|
s->streams[stream_index]->time_base.den :
|
|
AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ?
|
|
AV_ROUND_DOWN : AV_ROUND_UP);
|
|
if (s->duration < c->seek_timestamp) {
|
|
c->seek_timestamp = AV_NOPTS_VALUE;
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
ret = AVERROR(EIO);
|
|
for (i = 0; i < c->n_variants; i++) {
|
|
/* Reset reading */
|
|
struct variant *var = c->variants[i];
|
|
int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
|
|
0 : c->first_timestamp;
|
|
if (var->input) {
|
|
ffurl_close(var->input);
|
|
var->input = NULL;
|
|
}
|
|
av_free_packet(&var->pkt);
|
|
reset_packet(&var->pkt);
|
|
var->pb.eof_reached = 0;
|
|
/* Clear any buffered data */
|
|
var->pb.buf_end = var->pb.buf_ptr = var->pb.buffer;
|
|
/* Reset the pos, to let the mpegts demuxer know we've seeked. */
|
|
var->pb.pos = 0;
|
|
|
|
/* Locate the segment that contains the target timestamp */
|
|
for (j = 0; j < var->n_segments; j++) {
|
|
if (timestamp >= pos &&
|
|
timestamp < pos + var->segments[j]->duration) {
|
|
var->cur_seq_no = var->start_seq_no + j;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
pos += var->segments[j]->duration;
|
|
}
|
|
if (ret)
|
|
c->seek_timestamp = AV_NOPTS_VALUE;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
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,
|
|
};
|