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/*
 * Apple HTTP Live Streaming demuxer
 * Copyright (c) 2010 Martin Storsjo
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 * Copyright (c) 2013 Anssi Hannula
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 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Apple HTTP Live Streaming demuxer
 * http://tools.ietf.org/html/draft-pantos-http-live-streaming
 */

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#include "libavformat/http.h"
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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"
#include "internal.h"
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#include "avio_internal.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
#define MAX_CHARACTERISTICS_LEN 512

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#define MPEG_TIME_BASE 90000
#define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}

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/*
 * An apple http stream consists of a playlist with media segment files,
 * played sequentially. There may be several playlists with the same
 * video content, in different bandwidth variants, that are played in
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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
 * playlists.
 *
 * If the main playlist doesn't point at any variants, we still create
 * one anonymous toplevel variant for this, to maintain the structure.
 */

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enum KeyType {
    KEY_NONE,
    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;
    int64_t size;
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    char *url;
    char *key;
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    enum KeyType key_type;
    uint8_t iv[16];
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    /* associated Media Initialization Section, treated as a segment */
    struct segment *init_section;
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};

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struct rendition;

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enum PlaylistType {
    PLS_TYPE_UNSPECIFIED,
    PLS_TYPE_EVENT,
    PLS_TYPE_VOD
};

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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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struct playlist {
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    char url[MAX_URL_SIZE];
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    AVIOContext pb;
    uint8_t* read_buffer;
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    AVIOContext *input;
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    int input_read_done;
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    AVIOContext *input_next;
    int input_next_requested;
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    AVFormatContext *parent;
    int index;
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    AVFormatContext *ctx;
    AVPacket pkt;
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    int has_noheader_flag;
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    /* main demuxer streams associated with this playlist
     * indexed by the subdemuxer stream indexes */
    AVStream **main_streams;
    int n_main_streams;
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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;
    int n_segments;
    struct segment **segments;
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    int needed;
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    int broken;
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    int cur_seq_no;
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    int last_seq_no;
    int m3u8_hold_counters;
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    int64_t cur_seg_offset;
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    int64_t last_load_time;
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    /* Currently active Media Initialization Section */
    struct segment *cur_init_section;
    uint8_t *init_sec_buf;
    unsigned int init_sec_buf_size;
    unsigned int init_sec_data_len;
    unsigned int init_sec_buf_read_offset;

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    char key_url[MAX_URL_SIZE];
    uint8_t key[16];
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    /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
     * (and possibly other ID3 tags) in the beginning of each segment) */
    int is_id3_timestamped; /* -1: not yet known */
    int64_t id3_mpegts_timestamp; /* in mpegts tb */
    int64_t id3_offset; /* in stream original tb */
    uint8_t* id3_buf; /* temp buffer for id3 parsing */
    unsigned int id3_buf_size;
    AVDictionary *id3_initial; /* data from first id3 tag */
    int id3_found; /* ID3 tag found at some point */
    int id3_changed; /* ID3 tag data has changed at some point */
    ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */

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    int64_t seek_timestamp;
    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.
     * Alternative rendition playlists have a single rendition associated
     * with them, and variant main Media Playlists may have
     * multiple (playlist-less) renditions associated with them. */
    int n_renditions;
    struct rendition **renditions;
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    /* Media Initialization Sections (EXT-X-MAP) associated with this
     * playlist, if any. */
    int n_init_sections;
    struct segment **init_sections;
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};

/*
 * Renditions are e.g. alternative subtitle or audio streams.
 * The rendition may either be an external playlist or it may be
 * contained in the main Media Playlist of the variant (in which case
 * playlist is NULL).
 */
struct rendition {
    enum AVMediaType type;
    struct playlist *playlist;
    char group_id[MAX_FIELD_LEN];
    char language[MAX_FIELD_LEN];
    char name[MAX_FIELD_LEN];
    int disposition;
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};

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struct variant {
    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;
    struct playlist **playlists;
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    char audio_group[MAX_FIELD_LEN];
    char video_group[MAX_FIELD_LEN];
    char subtitles_group[MAX_FIELD_LEN];
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};

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typedef struct HLSContext {
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    AVClass *class;
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    AVFormatContext *ctx;
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    int n_variants;
    struct variant **variants;
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    int n_playlists;
    struct playlist **playlists;
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    int n_renditions;
    struct rendition **renditions;
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    int cur_seq_no;
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    int m3u8_hold_counters;
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    int live_start_index;
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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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    AVDictionary *avio_opts;
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    char *allowed_extensions;
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    int max_reload;
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    int http_persistent;
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    int http_multiple;
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    int http_seekable;
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    AVIOContext *playlist_pb;
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} HLSContext;
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static void free_segment_dynarray(struct segment **segments, int n_segments)
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{
    int i;
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    for (i = 0; i < n_segments; i++) {
        av_freep(&segments[i]->key);
        av_freep(&segments[i]->url);
        av_freep(&segments[i]);
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    }
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}

static void free_segment_list(struct playlist *pls)
{
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    free_segment_dynarray(pls->segments, pls->n_segments);
    av_freep(&pls->segments);
    pls->n_segments = 0;
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}

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static void free_init_section_list(struct playlist *pls)
{
    int i;
    for (i = 0; i < pls->n_init_sections; i++) {
        av_freep(&pls->init_sections[i]->url);
        av_freep(&pls->init_sections[i]);
    }
    av_freep(&pls->init_sections);
    pls->n_init_sections = 0;
}

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static void free_playlist_list(HLSContext *c)
{
    int i;
    for (i = 0; i < c->n_playlists; i++) {
        struct playlist *pls = c->playlists[i];
        free_segment_list(pls);
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        free_init_section_list(pls);
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        av_freep(&pls->main_streams);
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        av_freep(&pls->renditions);
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        av_freep(&pls->id3_buf);
        av_dict_free(&pls->id3_initial);
        ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
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        av_freep(&pls->init_sec_buf);
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        av_packet_unref(&pls->pkt);
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        av_freep(&pls->pb.buffer);
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        ff_format_io_close(c->ctx, &pls->input);
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        pls->input_read_done = 0;
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        ff_format_io_close(c->ctx, &pls->input_next);
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        pls->input_next_requested = 0;
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        if (pls->ctx) {
            pls->ctx->pb = NULL;
            avformat_close_input(&pls->ctx);
        }
        av_free(pls);
    }
    av_freep(&c->playlists);
    c->n_playlists = 0;
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}

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static void free_variant_list(HLSContext *c)
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{
    int i;
    for (i = 0; i < c->n_variants; i++) {
        struct variant *var = c->variants[i];
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        av_freep(&var->playlists);
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        av_free(var);
    }
    av_freep(&c->variants);
    c->n_variants = 0;
}

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static void free_rendition_list(HLSContext *c)
{
    int i;
    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);
    c->n_renditions = 0;
}

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/*
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 * Used to reset a statically allocated AVPacket to a clean state,
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 * containing no data.
 */
static void reset_packet(AVPacket *pkt)
{
    av_init_packet(pkt);
    pkt->data = NULL;
}

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static struct playlist *new_playlist(HLSContext *c, const char *url,
                                     const char *base)
{
    struct playlist *pls = av_mallocz(sizeof(struct playlist));
    if (!pls)
        return NULL;
    reset_packet(&pls->pkt);
    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;
    pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;

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    dynarray_add(&c->playlists, &c->n_playlists, pls);
    return pls;
}

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struct variant_info {
    char bandwidth[20];
    /* variant group ids: */
    char audio[MAX_FIELD_LEN];
    char video[MAX_FIELD_LEN];
    char subtitles[MAX_FIELD_LEN];
};

static struct variant *new_variant(HLSContext *c, struct variant_info *info,
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                                   const char *url, const char *base)
{
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    struct variant *var;
    struct playlist *pls;

    pls = new_playlist(c, url, base);
    if (!pls)
        return NULL;

    var = av_mallocz(sizeof(struct variant));
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    if (!var)
        return NULL;
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    if (info) {
        var->bandwidth = atoi(info->bandwidth);
        strcpy(var->audio_group, info->audio);
        strcpy(var->video_group, info->video);
        strcpy(var->subtitles_group, info->subtitles);
    }

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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;
}

static void handle_variant_args(struct variant_info *info, const char *key,
                                int key_len, char **dest, int *dest_len)
{
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    if (!strncmp(key, "BANDWIDTH=", key_len)) {
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        *dest     =        info->bandwidth;
        *dest_len = sizeof(info->bandwidth);
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    } else if (!strncmp(key, "AUDIO=", key_len)) {
        *dest     =        info->audio;
        *dest_len = sizeof(info->audio);
    } else if (!strncmp(key, "VIDEO=", key_len)) {
        *dest     =        info->video;
        *dest_len = sizeof(info->video);
    } else if (!strncmp(key, "SUBTITLES=", key_len)) {
        *dest     =        info->subtitles;
        *dest_len = sizeof(info->subtitles);
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    }
}

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struct key_info {
     char uri[MAX_URL_SIZE];
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     char method[11];
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     char iv[35];
};

static void handle_key_args(struct key_info *info, const char *key,
                            int key_len, char **dest, int *dest_len)
{
    if (!strncmp(key, "METHOD=", key_len)) {
        *dest     =        info->method;
        *dest_len = sizeof(info->method);
    } else if (!strncmp(key, "URI=", key_len)) {
        *dest     =        info->uri;
        *dest_len = sizeof(info->uri);
    } else if (!strncmp(key, "IV=", key_len)) {
        *dest     =        info->iv;
        *dest_len = sizeof(info->iv);
    }
}

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struct init_section_info {
    char uri[MAX_URL_SIZE];
    char byterange[32];
};

static struct segment *new_init_section(struct playlist *pls,
                                        struct init_section_info *info,
                                        const char *url_base)
{
    struct segment *sec;
    char *ptr;
    char tmp_str[MAX_URL_SIZE];

    if (!info->uri[0])
        return NULL;

    sec = av_mallocz(sizeof(*sec));
    if (!sec)
        return NULL;

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    if (!av_strncasecmp(info->uri, "data:", 5)) {
        strncpy(tmp_str, info->uri, strlen(info->uri));
    } else {
        ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
    }
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    sec->url = av_strdup(tmp_str);
    if (!sec->url) {
        av_free(sec);
        return NULL;
    }

    if (info->byterange[0]) {
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        sec->size = strtoll(info->byterange, NULL, 10);
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        ptr = strchr(info->byterange, '@');
        if (ptr)
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            sec->url_offset = strtoll(ptr+1, NULL, 10);
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    } else {
        /* the entire file is the init section */
        sec->size = -1;
    }

    dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);

    return sec;
}

static void handle_init_section_args(struct init_section_info *info, const char *key,
                                           int key_len, char **dest, int *dest_len)
{
    if (!strncmp(key, "URI=", key_len)) {
        *dest     =        info->uri;
        *dest_len = sizeof(info->uri);
    } else if (!strncmp(key, "BYTERANGE=", key_len)) {
        *dest     =        info->byterange;
        *dest_len = sizeof(info->byterange);
    }
}

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struct rendition_info {
    char type[16];
    char uri[MAX_URL_SIZE];
    char group_id[MAX_FIELD_LEN];
    char language[MAX_FIELD_LEN];
    char assoc_language[MAX_FIELD_LEN];
    char name[MAX_FIELD_LEN];
    char defaultr[4];
    char forced[4];
    char characteristics[MAX_CHARACTERISTICS_LEN];
};

static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
                                      const char *url_base)
{
    struct rendition *rend;
    enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
    char *characteristic;
    char *chr_ptr;
    char *saveptr;

    if (!strcmp(info->type, "AUDIO"))
        type = AVMEDIA_TYPE_AUDIO;
    else if (!strcmp(info->type, "VIDEO"))
        type = AVMEDIA_TYPE_VIDEO;
    else if (!strcmp(info->type, "SUBTITLES"))
        type = AVMEDIA_TYPE_SUBTITLE;
    else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
        /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
         * AVC SEI RBSP anyway */
        return NULL;

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    if (type == AVMEDIA_TYPE_UNKNOWN) {
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        av_log(c->ctx, AV_LOG_WARNING, "Can't support the type: %s\n", info->type);
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        return NULL;
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    }
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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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        av_log(c->ctx, AV_LOG_ERROR, "The URI tag is REQUIRED for subtitle.\n");
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        return NULL;
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    }
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    /* TODO: handle subtitles (each segment has to parsed separately) */
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    if (c->ctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
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        if (type == AVMEDIA_TYPE_SUBTITLE) {
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            av_log(c->ctx, AV_LOG_WARNING, "Can't support the subtitle(uri: %s)\n", info->uri);
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            return NULL;
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        }
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    rend = av_mallocz(sizeof(struct rendition));
    if (!rend)
        return NULL;

    dynarray_add(&c->renditions, &c->n_renditions, rend);

    rend->type = type;
    strcpy(rend->group_id, info->group_id);
    strcpy(rend->language, info->language);
    strcpy(rend->name, info->name);

    /* add the playlist if this is an external rendition */
    if (info->uri[0]) {
        rend->playlist = new_playlist(c, info->uri, url_base);
        if (rend->playlist)
            dynarray_add(&rend->playlist->renditions,
                         &rend->playlist->n_renditions, rend);
    }

    if (info->assoc_language[0]) {
        int langlen = strlen(rend->language);
        if (langlen < sizeof(rend->language) - 3) {
            rend->language[langlen] = ',';
            strncpy(rend->language + langlen + 1, info->assoc_language,
                    sizeof(rend->language) - langlen - 2);
        }
    }

    if (!strcmp(info->defaultr, "YES"))
        rend->disposition |= AV_DISPOSITION_DEFAULT;
    if (!strcmp(info->forced, "YES"))
        rend->disposition |= AV_DISPOSITION_FORCED;

    chr_ptr = info->characteristics;
    while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
        if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
            rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
        else if (!strcmp(characteristic, "public.accessibility.describes-video"))
            rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;

        chr_ptr = NULL;
    }

    return rend;
}

static void handle_rendition_args(struct rendition_info *info, const char *key,
                                  int key_len, char **dest, int *dest_len)
{
    if (!strncmp(key, "TYPE=", key_len)) {
        *dest     =        info->type;
        *dest_len = sizeof(info->type);
    } else if (!strncmp(key, "URI=", key_len)) {
        *dest     =        info->uri;
        *dest_len = sizeof(info->uri);
    } else if (!strncmp(key, "GROUP-ID=", key_len)) {
        *dest     =        info->group_id;
        *dest_len = sizeof(info->group_id);
    } else if (!strncmp(key, "LANGUAGE=", key_len)) {
        *dest     =        info->language;
        *dest_len = sizeof(info->language);
    } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
        *dest     =        info->assoc_language;
        *dest_len = sizeof(info->assoc_language);
    } else if (!strncmp(key, "NAME=", key_len)) {
        *dest     =        info->name;
        *dest_len = sizeof(info->name);
    } else if (!strncmp(key, "DEFAULT=", key_len)) {
        *dest     =        info->defaultr;
        *dest_len = sizeof(info->defaultr);
    } else if (!strncmp(key, "FORCED=", key_len)) {
        *dest     =        info->forced;
        *dest_len = sizeof(info->forced);
    } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
        *dest     =        info->characteristics;
        *dest_len = sizeof(info->characteristics);
    }
    /*
     * ignored:
     * - AUTOSELECT: client may autoselect based on e.g. system language
     * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
     */
}

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/* used by parse_playlist to allocate a new variant+playlist when the
 * playlist is detected to be a Media Playlist (not Master Playlist)
 * and we have no parent Master Playlist (parsing of which would have
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 * allocated the variant and playlist already)
 * *pls == NULL  => Master Playlist or parentless Media Playlist
 * *pls != NULL => parented Media Playlist, playlist+variant allocated */
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static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
{
    if (*pls)
        return 0;
    if (!new_variant(c, NULL, url, NULL))
        return AVERROR(ENOMEM);
    *pls = c->playlists[c->n_playlists - 1];
    return 0;
}

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static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb,
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                              const char *url, AVDictionary **options)
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{
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#if !CONFIG_HTTP_PROTOCOL
    return AVERROR_PROTOCOL_NOT_FOUND;
#else
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    int ret;
    URLContext *uc = ffio_geturlcontext(*pb);
    av_assert0(uc);
    (*pb)->eof_reached = 0;
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    ret = ff_http_do_new_request2(uc, url, options);
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    if (ret < 0) {
        ff_format_io_close(s, pb);
    }
    return ret;
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#endif
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}

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static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
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                    AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
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{
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    HLSContext *c = s->priv_data;
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    AVDictionary *tmp = NULL;
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    const char *proto_name = NULL;
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    int ret;
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    int is_http = 0;
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    if (av_strstart(url, "crypto", NULL)) {
        if (url[6] == '+' || url[6] == ':')
            proto_name = avio_find_protocol_name(url + 7);
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    } else if (av_strstart(url, "data", NULL)) {
        if (url[4] == '+' || url[4] == ':')
            proto_name = avio_find_protocol_name(url + 5);
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    }

    if (!proto_name)
        proto_name = avio_find_protocol_name(url);

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    if (!proto_name)
        return AVERROR_INVALIDDATA;

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    // only http(s) & file are allowed
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    if (av_strstart(proto_name, "file", NULL)) {
        if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
            av_log(s, AV_LOG_ERROR,
                "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
                "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
                url);
            return AVERROR_INVALIDDATA;
        }
    } else if (av_strstart(proto_name, "http", NULL)) {
655
        is_http = 1;
656 657
    } else if (av_strstart(proto_name, "data", NULL)) {
        ;
658
    } else
659
        return AVERROR_INVALIDDATA;
660

661 662
    if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
        ;
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    else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
        ;
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    else if (av_strstart(url, "data", NULL) && !strncmp(proto_name, url + 5, strlen(proto_name)) && url[5 + strlen(proto_name)] == ':')
        ;
667
    else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
668
        return AVERROR_INVALIDDATA;
669

670 671 672
    av_dict_copy(&tmp, opts, 0);
    av_dict_copy(&tmp, opts2, 0);

673
    if (is_http && c->http_persistent && *pb) {
674
        ret = open_url_keepalive(c->ctx, pb, url, &tmp);
675
        if (ret == AVERROR_EXIT) {
676
            av_dict_free(&tmp);
677 678
            return ret;
        } else if (ret < 0) {
679 680
            if (ret != AVERROR_EOF)
                av_log(s, AV_LOG_WARNING,
681
                    "keepalive request failed for '%s' with error: '%s' when opening url, retrying with new connection\n",
682
                    url, av_err2str(ret));
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            ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
        }
    } else {
        ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
    }
688
    if (ret >= 0) {
689
        // update cookies on http response with setcookies.
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        char *new_cookies = NULL;

        if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
            av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);

695 696
        if (new_cookies)
            av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
697
    }
698 699 700

    av_dict_free(&tmp);

701 702
    if (is_http_out)
        *is_http_out = is_http;
703

704 705 706
    return ret;
}

707
static int parse_playlist(HLSContext *c, const char *url,
708
                          struct playlist *pls, AVIOContext *in)
709
{
710
    int ret = 0, is_segment = 0, is_variant = 0;
711
    int64_t duration = 0;
712 713 714
    enum KeyType key_type = KEY_NONE;
    uint8_t iv[16] = "";
    int has_iv = 0;
715
    char key[MAX_URL_SIZE] = "";
716
    char line[MAX_URL_SIZE];
717 718
    const char *ptr;
    int close_in = 0;
719 720
    int64_t seg_offset = 0;
    int64_t seg_size = -1;
721
    uint8_t *new_url = NULL;
722
    struct variant_info variant_info;
723
    char tmp_str[MAX_URL_SIZE];
724
    struct segment *cur_init_section = NULL;
725
    int is_http = av_strstart(url, "http", NULL);
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    struct segment **prev_segments = NULL;
    int prev_n_segments = 0;
    int prev_start_seq_no = -1;
729

730
    if (is_http && !in && c->http_persistent && c->playlist_pb) {
731
        in = c->playlist_pb;
732
        ret = open_url_keepalive(c->ctx, &c->playlist_pb, url, NULL);
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        if (ret == AVERROR_EXIT) {
            return ret;
        } else if (ret < 0) {
736 737
            if (ret != AVERROR_EOF)
                av_log(c->ctx, AV_LOG_WARNING,
738
                    "keepalive request failed for '%s' with error: '%s' when parsing playlist\n",
739
                    url, av_err2str(ret));
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            in = NULL;
        }
    }

744
    if (!in) {
745
        AVDictionary *opts = NULL;
746
        av_dict_copy(&opts, c->avio_opts, 0);
747

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        if (c->http_persistent)
            av_dict_set(&opts, "multiple_requests", "1", 0);

751
        ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
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        av_dict_free(&opts);
        if (ret < 0)
754
            return ret;
755

756
        if (is_http && c->http_persistent)
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            c->playlist_pb = in;
        else
            close_in = 1;
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    }

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    if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
        url = new_url;

765
    ff_get_chomp_line(in, line, sizeof(line));
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    if (strcmp(line, "#EXTM3U")) {
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

771
    if (pls) {
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        prev_start_seq_no = pls->start_seq_no;
        prev_segments = pls->segments;
        prev_n_segments = pls->n_segments;
        pls->segments = NULL;
        pls->n_segments = 0;

778
        pls->finished = 0;
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        pls->type = PLS_TYPE_UNSPECIFIED;
780
    }
781
    while (!avio_feof(in)) {
782
        ff_get_chomp_line(in, line, sizeof(line));
783 784
        if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
            is_variant = 1;
785
            memset(&variant_info, 0, sizeof(variant_info));
786
            ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
787
                               &variant_info);
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        } 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;
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            if (!strcmp(info.method, "SAMPLE-AES"))
                key_type = KEY_SAMPLE_AES;
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            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));
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        } 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);
808
        } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
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            ret = ensure_playlist(c, &pls, url);
            if (ret < 0)
                goto fail;
812
            pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
813
        } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
814 815 816
            ret = ensure_playlist(c, &pls, url);
            if (ret < 0)
                goto fail;
817
            pls->start_seq_no = atoi(ptr);
818 819 820 821 822 823 824 825
        } 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;
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        } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
            struct init_section_info info = {{0}};
            ret = ensure_playlist(c, &pls, url);
            if (ret < 0)
                goto fail;
            ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
                               &info);
            cur_init_section = new_init_section(pls, &info, url);
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            cur_init_section->key_type = key_type;
            if (has_iv) {
                memcpy(cur_init_section->iv, iv, sizeof(iv));
            } else {
                int seq = pls->start_seq_no + pls->n_segments;
                memset(cur_init_section->iv, 0, sizeof(cur_init_section->iv));
                AV_WB32(cur_init_section->iv + 12, seq);
            }

            if (key_type != KEY_NONE) {
                ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
                cur_init_section->key = av_strdup(tmp_str);
                if (!cur_init_section->key) {
                    av_free(cur_init_section);
                    ret = AVERROR(ENOMEM);
                    goto fail;
                }
            } else {
                cur_init_section->key = NULL;
            }

855
        } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
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            if (pls)
                pls->finished = 1;
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        } else if (av_strstart(line, "#EXTINF:", &ptr)) {
            is_segment = 1;
860
            duration   = atof(ptr) * AV_TIME_BASE;
861
        } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
862
            seg_size = strtoll(ptr, NULL, 10);
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            ptr = strchr(ptr, '@');
            if (ptr)
865
                seg_offset = strtoll(ptr+1, NULL, 10);
866
        } else if (av_strstart(line, "#", NULL)) {
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Jun Zhao committed
867
            av_log(c->ctx, AV_LOG_INFO, "Skip ('%s')\n", line);
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            continue;
        } else if (line[0]) {
            if (is_variant) {
871
                if (!new_variant(c, &variant_info, line, url)) {
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                    ret = AVERROR(ENOMEM);
                    goto fail;
                }
                is_variant = 0;
            }
            if (is_segment) {
                struct segment *seg;
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                ret = ensure_playlist(c, &pls, url);
                if (ret < 0)
                    goto fail;
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                seg = av_malloc(sizeof(struct segment));
                if (!seg) {
                    ret = AVERROR(ENOMEM);
                    goto fail;
                }
                seg->duration = duration;
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                seg->key_type = key_type;
                if (has_iv) {
                    memcpy(seg->iv, iv, sizeof(iv));
                } else {
892
                    int seq = pls->start_seq_no + pls->n_segments;
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                    memset(seg->iv, 0, sizeof(seg->iv));
                    AV_WB32(seg->iv + 12, seq);
                }
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                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;
                }

918
                dynarray_add(&pls->segments, &pls->n_segments, seg);
919
                is_segment = 0;
920 921 922 923 924 925 926 927 928 929

                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;
                }
930 931

                seg->init_section = cur_init_section;
932 933 934
            }
        }
    }
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
    if (prev_segments) {
        if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
            int64_t prev_timestamp = c->first_timestamp;
            int i, diff = pls->start_seq_no - prev_start_seq_no;
            for (i = 0; i < prev_n_segments && i < diff; i++) {
                c->first_timestamp += prev_segments[i]->duration;
            }
            av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%d -> %d)"
                   " reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
                   prev_start_seq_no, pls->start_seq_no,
                   prev_timestamp, c->first_timestamp);
        } else if (pls->start_seq_no < prev_start_seq_no) {
            av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %d -> %d\n",
                   prev_start_seq_no, pls->start_seq_no);
        }
        free_segment_dynarray(prev_segments, prev_n_segments);
951
        av_freep(&prev_segments);
952
    }
953
    if (pls)
954
        pls->last_load_time = av_gettime_relative();
955 956

fail:
957
    av_free(new_url);
958
    if (close_in)
959
        ff_format_io_close(c->ctx, &in);
960 961 962 963 964
    c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
    if (!c->n_variants || !c->variants[0]->n_playlists ||
        !(c->variants[0]->playlists[0]->finished ||
          c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
        c->ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
965 966 967
    return ret;
}

968 969 970 971 972
static struct segment *current_segment(struct playlist *pls)
{
    return pls->segments[pls->cur_seq_no - pls->start_seq_no];
}

973 974 975 976 977 978 979 980
static struct segment *next_segment(struct playlist *pls)
{
    int n = pls->cur_seq_no - pls->start_seq_no + 1;
    if (n >= pls->n_segments)
        return NULL;
    return pls->segments[n];
}

981
static int read_from_url(struct playlist *pls, struct segment *seg,
982
                         uint8_t *buf, int buf_size)
983 984 985 986 987 988 989
{
    int ret;

     /* limit read if the segment was only a part of a file */
    if (seg->size >= 0)
        buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);

990
    ret = avio_read(pls->input, buf, buf_size);
991 992 993 994 995 996
    if (ret > 0)
        pls->cur_seg_offset += ret;

    return ret;
}

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
/* 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;
1042
        if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
            return 1;

        if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
            return 1;
    }

    return 0;
}

/* Parse ID3 data and handle the found data */
static void handle_id3(AVIOContext *pb, struct playlist *pls)
{
    AVDictionary *metadata = NULL;
    ID3v2ExtraMetaAPIC *apic = NULL;
    ID3v2ExtraMeta *extra_meta = NULL;
    int64_t timestamp = AV_NOPTS_VALUE;

    parse_id3(pls->ctx, pb, &metadata, &timestamp, &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;

1079
        ff_id3v2_parse_priv_dict(&metadata, &extra_meta);
1080 1081 1082 1083 1084
        av_dict_copy(&pls->ctx->metadata, metadata, 0);
        pls->id3_initial = metadata;

    } else {
        if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
1085
            avpriv_report_missing_feature(pls->parent, "Changing ID3 metadata in HLS audio elementary stream");
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
            pls->id3_changed = 1;
        }
        av_dict_free(&metadata);
    }

    if (!pls->id3_deferred_extra)
        ff_id3v2_free_extra_meta(&extra_meta);
}

static void intercept_id3(struct playlist *pls, uint8_t *buf,
                         int buf_size, int *len)
{
    /* intercept id3 tags, we do not want to pass them to the raw
     * demuxer on all segment switches */
    int bytes;
    int id3_buf_pos = 0;
    int fill_buf = 0;
1103
    struct segment *seg = current_segment(pls);
1104 1105 1106 1107 1108

    /* 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) {
1109
            bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
            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)) {
1130
            int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
1131 1132 1133 1134
            int taglen = ff_id3v2_tag_len(buf);
            int tag_got_bytes = FFMIN(taglen, *len);
            int remaining = taglen - tag_got_bytes;

1135
            if (taglen > maxsize) {
1136
                av_log(pls->parent, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
1137
                       taglen, maxsize);
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
                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);
1157
            av_log(pls->parent, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
1158 1159 1160

            if (remaining > 0) {
                /* read the rest of the tag in */
1161
                if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
1162 1163
                    break;
                id3_buf_pos += remaining;
1164
                av_log(pls->parent, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
            }

        } else {
            /* no more ID3 tags */
            break;
        }
    }

    /* re-fill buffer for the caller unless EOF */
    if (*len >= 0 && (fill_buf || *len == 0)) {
1175
        bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194

        /* 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);
}

1195
static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
1196
{
1197 1198
    AVDictionary *opts = NULL;
    int ret;
1199
    int is_http = 0;
1200

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    if (c->http_persistent)
        av_dict_set(&opts, "multiple_requests", "1", 0);

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    if (seg->size >= 0) {
        /* try to restrict the HTTP request to the part we want
         * (if this is in fact a HTTP request) */
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        av_dict_set_int(&opts, "offset", seg->url_offset, 0);
        av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1209 1210
    }

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    av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
           seg->url, seg->url_offset, pls->index);

1214
    if (seg->key_type == KEY_NONE) {
1215
        ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
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    } else if (seg->key_type == KEY_AES_128) {
        char iv[33], key[33], url[MAX_URL_SIZE];
1218
        if (strcmp(seg->key, pls->key_url)) {
1219
            AVIOContext *pb = NULL;
1220
            if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
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                ret = avio_read(pb, pls->key, sizeof(pls->key));
                if (ret != sizeof(pls->key)) {
1223
                    av_log(pls->parent, AV_LOG_ERROR, "Unable to read key file %s\n",
1224 1225
                           seg->key);
                }
1226
                ff_format_io_close(pls->parent, &pb);
1227
            } else {
1228
                av_log(pls->parent, AV_LOG_ERROR, "Unable to open key file %s\n",
1229 1230
                       seg->key);
            }
1231
            av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
1232 1233
        }
        ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
1234
        ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
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        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);
1240

1241 1242
        av_dict_set(&opts, "key", key, 0);
        av_dict_set(&opts, "iv", iv, 0);
1243

1244
        ret = open_url(pls->parent, in, url, c->avio_opts, opts, &is_http);
1245
        if (ret < 0) {
1246
            goto cleanup;
1247
        }
1248
        ret = 0;
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    } 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;
1253
    }
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    else
      ret = AVERROR(ENOSYS);

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    /* 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
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     * without a HTTP server.
     *
     * This is not done for HTTP at all as avio_seek() does internal bookkeeping
     * of file offset which is out-of-sync with the actual offset when "offset"
     * AVOption is used with http protocol, causing the seek to not be a no-op
     * as would be expected. Wrong offset received from the server will not be
     * noticed without the call, though.
     */
    if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
1268
        int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
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        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;
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            ff_format_io_close(pls->parent, in);
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        }
    }

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cleanup:
    av_dict_free(&opts);
1278
    pls->cur_seg_offset = 0;
1279
    return ret;
1280 1281
}

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static int update_init_section(struct playlist *pls, struct segment *seg)
{
    static const int max_init_section_size = 1024*1024;
    HLSContext *c = pls->parent->priv_data;
    int64_t sec_size;
    int64_t urlsize;
    int ret;

    if (seg->init_section == pls->cur_init_section)
        return 0;

    pls->cur_init_section = NULL;

    if (!seg->init_section)
        return 0;

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    ret = open_input(c, pls, seg->init_section, &pls->input);
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    if (ret < 0) {
        av_log(pls->parent, AV_LOG_WARNING,
               "Failed to open an initialization section in playlist %d\n",
               pls->index);
        return ret;
    }

    if (seg->init_section->size >= 0)
        sec_size = seg->init_section->size;
1308
    else if ((urlsize = avio_size(pls->input)) >= 0)
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        sec_size = urlsize;
    else
        sec_size = max_init_section_size;

    av_log(pls->parent, AV_LOG_DEBUG,
           "Downloading an initialization section of size %"PRId64"\n",
           sec_size);

    sec_size = FFMIN(sec_size, max_init_section_size);

    av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);

    ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
1322
                        pls->init_sec_buf_size);
1323
    ff_format_io_close(pls->parent, &pls->input);
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    if (ret < 0)
        return ret;

    pls->cur_init_section = seg->init_section;
    pls->init_sec_data_len = ret;
    pls->init_sec_buf_read_offset = 0;

    /* spec says audio elementary streams do not have media initialization
     * sections, so there should be no ID3 timestamps */
    pls->is_id3_timestamped = 0;

    return 0;
}

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static int64_t default_reload_interval(struct playlist *pls)
{
    return pls->n_segments > 0 ?
                          pls->segments[pls->n_segments - 1]->duration :
                          pls->target_duration;
}

1346 1347
static int playlist_needed(struct playlist *pls)
{
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    AVFormatContext *s = pls->parent;
    int i, j;
    int stream_needed = 0;
    int first_st;
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    /* If there is no context or streams yet, the playlist is needed */
    if (!pls->ctx || !pls->n_main_streams)
        return 1;

    /* check if any of the streams in the playlist are needed */
    for (i = 0; i < pls->n_main_streams; i++) {
        if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
            stream_needed = 1;
            break;
        }
    }

    /* If all streams in the playlist were discarded, the playlist is not
     * needed (regardless of whether whole programs are discarded or not). */
    if (!stream_needed)
        return 0;

    /* Otherwise, check if all the programs (variants) this playlist is in are
     * discarded. Since all streams in the playlist are part of the same programs
     * we can just check the programs of the first stream. */

    first_st = pls->main_streams[0]->index;

    for (i = 0; i < s->nb_programs; i++) {
        AVProgram *program = s->programs[i];
        if (program->discard < AVDISCARD_ALL) {
            for (j = 0; j < program->nb_stream_indexes; j++) {
                if (program->stream_index[j] == first_st) {
                    /* playlist is in an undiscarded program */
                    return 1;
                }
            }
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        }
    }

1388
    /* some streams were not discarded but all the programs were */
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    return 0;
}

1392 1393
static int read_data(void *opaque, uint8_t *buf, int buf_size)
{
1394
    struct playlist *v = opaque;
1395
    HLSContext *c = v->parent->priv_data;
1396
    int ret;
1397
    int just_opened = 0;
1398
    int reload_count = 0;
1399
    struct segment *seg;
1400

1401
restart:
1402 1403 1404
    if (!v->needed)
        return AVERROR_EOF;

1405
    if (!v->input || (c->http_persistent && v->input_read_done)) {
1406 1407 1408 1409
        int64_t reload_interval;

        /* Check that the playlist is still needed before opening a new
         * segment. */
1410 1411
        v->needed = playlist_needed(v);

1412
        if (!v->needed) {
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Jun Zhao committed
1413 1414
            av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
                   v->index, v->url);
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            return AVERROR_EOF;
        }

1418
        /* If this is a live stream and the reload interval has elapsed since
1419
         * the last playlist reload, reload the playlists now. */
1420
        reload_interval = default_reload_interval(v);
1421

1422
reload:
1423 1424 1425
        reload_count++;
        if (reload_count > c->max_reload)
            return AVERROR_EOF;
1426
        if (!v->finished &&
1427
            av_gettime_relative() - v->last_load_time >= reload_interval) {
1428
            if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
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                if (ret != AVERROR_EXIT)
                    av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
                           v->index);
1432
                return ret;
1433
            }
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            /* 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. */
1437
            reload_interval = v->target_duration / 2;
1438
        }
1439
        if (v->cur_seq_no < v->start_seq_no) {
1440
            av_log(v->parent, AV_LOG_WARNING,
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                   "skipping %d segments ahead, expired from playlists\n",
                   v->start_seq_no - v->cur_seq_no);
            v->cur_seq_no = v->start_seq_no;
        }
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        if (v->cur_seq_no > v->last_seq_no) {
            v->last_seq_no = v->cur_seq_no;
            v->m3u8_hold_counters = 0;
        } else if (v->last_seq_no == v->cur_seq_no) {
            v->m3u8_hold_counters++;
            if (v->m3u8_hold_counters >= c->m3u8_hold_counters) {
                return AVERROR_EOF;
            }
        } else {
            av_log(v->parent, AV_LOG_WARNING, "maybe the m3u8 list sequence have been wraped.\n");
        }
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        if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
            if (v->finished)
                return AVERROR_EOF;
1459
            while (av_gettime_relative() - v->last_load_time < reload_interval) {
1460
                if (ff_check_interrupt(c->interrupt_callback))
1461
                    return AVERROR_EXIT;
1462
                av_usleep(100*1000);
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            }
            /* Enough time has elapsed since the last reload */
            goto reload;
        }

1468
        v->input_read_done = 0;
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        seg = current_segment(v);

        /* load/update Media Initialization Section, if any */
        ret = update_init_section(v, seg);
        if (ret)
            return ret;

1476
        if (c->http_multiple == 1 && v->input_next_requested) {
1477
            FFSWAP(AVIOContext *, v->input, v->input_next);
1478
            v->cur_seg_offset = 0;
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            v->input_next_requested = 0;
            ret = 0;
        } else {
            ret = open_input(c, v, seg, &v->input);
        }
1484
        if (ret < 0) {
1485 1486
            if (ff_check_interrupt(c->interrupt_callback))
                return AVERROR_EXIT;
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            av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
                   v->cur_seq_no,
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                   v->index);
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            v->cur_seq_no += 1;
            goto reload;
1492
        }
1493
        just_opened = 1;
1494
    }
1495

1496 1497
    if (c->http_multiple == -1) {
        uint8_t *http_version_opt = NULL;
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        int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
        if (r >= 0) {
1500
            c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
1501 1502
            av_freep(&http_version_opt);
        }
1503 1504
    }

1505
    seg = next_segment(v);
1506
    if (c->http_multiple == 1 && !v->input_next_requested &&
1507
        seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
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        ret = open_input(c, v, seg, &v->input_next);
        if (ret < 0) {
            if (ff_check_interrupt(c->interrupt_callback))
                return AVERROR_EXIT;
1512
            av_log(v->parent, AV_LOG_WARNING, "Failed to open next segment %d of playlist %d\n",
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                   v->cur_seq_no + 1,
                   v->index);
        } else {
            v->input_next_requested = 1;
        }
    }

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    if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
        /* Push init section out first before first actual segment */
        int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
        memcpy(buf, v->init_sec_buf, copy_size);
        v->init_sec_buf_read_offset += copy_size;
        return copy_size;
    }

1528
    seg = current_segment(v);
1529
    ret = read_from_url(v, seg, buf, buf_size);
1530
    if (ret > 0) {
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        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);
        }

1537
        return ret;
1538
    }
1539 1540
    if (c->http_persistent &&
        seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
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        v->input_read_done = 1;
    } else {
        ff_format_io_close(v->parent, &v->input);
    }
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    v->cur_seq_no++;

    c->cur_seq_no = v->cur_seq_no;

    goto restart;
}

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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;

1582 1583
    for (i = 0; i < pls->n_main_streams; i++) {
        AVStream *st = pls->main_streams[i];
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1585
        if (st->codecpar->codec_type != type)
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            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;
    }
}

1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633
/* 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;
}

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static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
{
    int seq_no;

    if (!pls->finished && !c->first_packet &&
1639
        av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
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        /* 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;

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        /* If this is a live stream, start live_start_index segments from the
         * start or end */
        if (c->live_start_index < 0)
            return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
        else
            return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
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    }

    /* Otherwise just start on the first segment. */
    return pls->start_seq_no;
}

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static int save_avio_options(AVFormatContext *s)
{
    HLSContext *c = s->priv_data;
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1676
    static const char * const opts[] = {
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        "headers", "http_proxy", "user_agent", "cookies", "referer", "rw_timeout", "icy", NULL };
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    const char * const * opt = opts;
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    uint8_t *buf;
    int ret = 0;

    while (*opt) {
1683
        if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
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            ret = av_dict_set(&c->avio_opts, *opt, buf,
                              AV_DICT_DONT_STRDUP_VAL);
            if (ret < 0)
                return ret;
        }
        opt++;
    }

    return ret;
}

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static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
                          int flags, AVDictionary **opts)
{
    av_log(s, AV_LOG_ERROR,
           "A HLS playlist item '%s' referred to an external file '%s'. "
           "Opening this file was forbidden for security reasons\n",
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           s->url, url);
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    return AVERROR(EPERM);
}

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static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
{
    HLSContext *c = s->priv_data;
    int i, j;
    int bandwidth = -1;

    for (i = 0; i < c->n_variants; i++) {
        struct variant *v = c->variants[i];

        for (j = 0; j < v->n_playlists; j++) {
            if (v->playlists[j] != pls)
                continue;

            av_program_add_stream_index(s, i, stream->index);

            if (bandwidth < 0)
                bandwidth = v->bandwidth;
            else if (bandwidth != v->bandwidth)
                bandwidth = -1; /* stream in multiple variants with different bandwidths */
        }
    }

    if (bandwidth >= 0)
        av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
}

1731
static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
1732
{
1733 1734 1735 1736 1737
    int err;

    err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
    if (err < 0)
        return err;
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    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);
1743 1744

    st->internal->need_context_update = 1;
1745 1746

    return 0;
1747 1748
}

1749 1750 1751
/* add new subdemuxer streams to our context, if any */
static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
{
1752 1753
    int err;

1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
    while (pls->n_main_streams < pls->ctx->nb_streams) {
        int ist_idx = pls->n_main_streams;
        AVStream *st = avformat_new_stream(s, NULL);
        AVStream *ist = pls->ctx->streams[ist_idx];

        if (!st)
            return AVERROR(ENOMEM);

        st->id = pls->index;
        dynarray_add(&pls->main_streams, &pls->n_main_streams, st);

        add_stream_to_programs(s, pls, st);
1766 1767 1768 1769

        err = set_stream_info_from_input_stream(st, pls, ist);
        if (err < 0)
            return err;
1770 1771 1772 1773 1774
    }

    return 0;
}

1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
static void update_noheader_flag(AVFormatContext *s)
{
    HLSContext *c = s->priv_data;
    int flag_needed = 0;
    int i;

    for (i = 0; i < c->n_playlists; i++) {
        struct playlist *pls = c->playlists[i];

        if (pls->has_noheader_flag) {
            flag_needed = 1;
            break;
        }
    }

    if (flag_needed)
        s->ctx_flags |= AVFMTCTX_NOHEADER;
    else
        s->ctx_flags &= ~AVFMTCTX_NOHEADER;
}

1796 1797 1798 1799 1800 1801 1802 1803 1804
static int hls_close(AVFormatContext *s)
{
    HLSContext *c = s->priv_data;

    free_playlist_list(c);
    free_variant_list(c);
    free_rendition_list(c);

    av_dict_free(&c->avio_opts);
1805
    ff_format_io_close(c->ctx, &c->playlist_pb);
1806 1807 1808 1809

    return 0;
}

1810
static int hls_read_header(AVFormatContext *s)
1811
{
1812
    HLSContext *c = s->priv_data;
1813
    int ret = 0, i;
1814
    int highest_cur_seq_no = 0;
1815

1816
    c->ctx                = s;
1817 1818
    c->interrupt_callback = &s->interrupt_callback;

1819 1820 1821 1822
    c->first_packet = 1;
    c->first_timestamp = AV_NOPTS_VALUE;
    c->cur_timestamp = AV_NOPTS_VALUE;

1823 1824 1825
    if ((ret = save_avio_options(s)) < 0)
        goto fail;

1826 1827 1828 1829
    /* XXX: Some HLS servers don't like being sent the range header,
       in this case, need to  setting http_seekable = 0 to disable
       the range header */
    av_dict_set_int(&c->avio_opts, "seekable", c->http_seekable, 0);
1830

1831 1832 1833
    if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
        goto fail;

1834
    if (c->n_variants == 0) {
1835
        av_log(s, AV_LOG_WARNING, "Empty playlist\n");
1836 1837 1838
        ret = AVERROR_EOF;
        goto fail;
    }
1839 1840 1841 1842 1843
    /* 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];
1844
            pls->m3u8_hold_counters = 0;
1845 1846 1847 1848 1849
            if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) {
                av_log(s, AV_LOG_WARNING, "parse_playlist error %s [%s]\n", av_err2str(ret), pls->url);
                pls->broken = 1;
                if (c->n_playlists > 1)
                    continue;
1850
                goto fail;
1851
            }
1852 1853 1854
        }
    }

1855 1856 1857 1858 1859
    for (i = 0; i < c->n_variants; i++) {
        if (c->variants[i]->playlists[0]->n_segments == 0) {
            av_log(s, AV_LOG_WARNING, "Empty segment [%s]\n", c->variants[i]->playlists[0]->url);
            c->variants[i]->playlists[0]->broken = 1;
        }
1860 1861 1862 1863
    }

    /* If this isn't a live stream, calculate the total duration of the
     * stream. */
1864
    if (c->variants[0]->playlists[0]->finished) {
1865
        int64_t duration = 0;
1866 1867
        for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
            duration += c->variants[0]->playlists[0]->segments[i]->duration;
1868
        s->duration = duration;
1869 1870
    }

1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882
    /* 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);
    }

1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893
    /* 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);
    }

1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
    /* Select the starting segments */
    for (i = 0; i < c->n_playlists; i++) {
        struct playlist *pls = c->playlists[i];

        if (pls->n_segments == 0)
            continue;

        pls->cur_seq_no = select_cur_seq_no(c, pls);
        highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
    }

1905 1906 1907
    /* Open the demuxer for each playlist */
    for (i = 0; i < c->n_playlists; i++) {
        struct playlist *pls = c->playlists[i];
1908
        ff_const59 AVInputFormat *in_fmt = NULL;
1909

1910
        if (!(pls->ctx = avformat_alloc_context())) {
1911 1912 1913 1914
            ret = AVERROR(ENOMEM);
            goto fail;
        }

1915 1916 1917
        if (pls->n_segments == 0)
            continue;

1918 1919 1920
        pls->index  = i;
        pls->needed = 1;
        pls->parent = s;
1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932

        /*
         * If this is a live stream and this playlist looks like it is one segment
         * behind, try to sync it up so that every substream starts at the same
         * time position (so e.g. avformat_find_stream_info() will see packets from
         * all active streams within the first few seconds). This is not very generic,
         * though, as the sequence numbers are technically independent.
         */
        if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
            highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
            pls->cur_seq_no = highest_cur_seq_no;
        }
1933

1934
        pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1935 1936 1937 1938 1939 1940
        if (!pls->read_buffer){
            ret = AVERROR(ENOMEM);
            avformat_free_context(pls->ctx);
            pls->ctx = NULL;
            goto fail;
        }
1941
        ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
1942
                          read_data, NULL, NULL);
1943 1944
        pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4;
        pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE;
1945
        ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
1946
                                    NULL, 0, 0);
1947 1948 1949 1950 1951
        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. */
1952 1953 1954
            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;
1955
            goto fail;
1956
        }
1957
        pls->ctx->pb       = &pls->pb;
1958
        pls->ctx->io_open  = nested_io_open;
1959
        pls->ctx->flags   |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
1960

1961
        if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1962
            goto fail;
1963

1964
        ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
1965 1966
        if (ret < 0)
            goto fail;
1967

1968 1969 1970
        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);
1971
            ff_id3v2_parse_priv(pls->ctx, &pls->id3_deferred_extra);
1972 1973 1974 1975 1976 1977 1978
            ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
            pls->id3_deferred_extra = NULL;
        }

        if (pls->is_id3_timestamped == -1)
            av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");

1979 1980 1981 1982 1983 1984
        /*
         * For ID3 timestamped raw audio streams we need to detect the packet
         * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
         * but for other streams we can rely on our user calling avformat_find_stream_info()
         * on us if they want to.
         */
1985
        if (pls->is_id3_timestamped || (pls->n_renditions > 0 && pls->renditions[0]->type == AVMEDIA_TYPE_AUDIO)) {
1986 1987 1988 1989 1990 1991 1992
            ret = avformat_find_stream_info(pls->ctx, NULL);
            if (ret < 0)
                goto fail;
        }

        pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);

1993
        /* Create new AVStreams for each stream in this playlist */
1994 1995 1996
        ret = update_streams_from_subdemuxer(s, pls);
        if (ret < 0)
            goto fail;
1997

1998 1999 2000 2001 2002 2003 2004
        /*
         * Copy any metadata from playlist to main streams, but do not set
         * event flags.
         */
        if (pls->n_main_streams)
            av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);

2005 2006 2007
        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);
2008 2009
    }

2010 2011
    update_noheader_flag(s);

2012 2013
    return 0;
fail:
2014
    hls_close(s);
2015 2016 2017
    return ret;
}

2018
static int recheck_discard_flags(AVFormatContext *s, int first)
2019
{
2020
    HLSContext *c = s->priv_data;
2021
    int i, changed = 0;
2022
    int cur_needed;
2023

2024
    /* Check if any new streams are needed */
2025 2026
    for (i = 0; i < c->n_playlists; i++) {
        struct playlist *pls = c->playlists[i];
2027 2028 2029

        cur_needed = playlist_needed(c->playlists[i]);

2030 2031 2032
        if (pls->broken) {
            continue;
        }
2033
        if (cur_needed && !pls->needed) {
2034
            pls->needed = 1;
2035
            changed = 1;
2036
            pls->cur_seq_no = select_cur_seq_no(c, pls);
2037
            pls->pb.eof_reached = 0;
2038 2039 2040 2041
            if (c->cur_timestamp != AV_NOPTS_VALUE) {
                /* catch up */
                pls->seek_timestamp = c->cur_timestamp;
                pls->seek_flags = AVSEEK_FLAG_ANY;
2042
                pls->seek_stream_index = -1;
2043 2044
            }
            av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
2045
        } else if (first && !cur_needed && pls->needed) {
2046
            ff_format_io_close(pls->parent, &pls->input);
2047
            pls->input_read_done = 0;
2048
            ff_format_io_close(pls->parent, &pls->input_next);
2049
            pls->input_next_requested = 0;
2050
            pls->needed = 0;
2051
            changed = 1;
2052
            av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
2053 2054
        }
    }
2055
    return changed;
2056 2057
}

2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090
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;
}

2091 2092 2093 2094 2095 2096 2097 2098 2099
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);
}

2100
static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
2101
{
2102
    HLSContext *c = s->priv_data;
2103
    int ret, i, minplaylist = -1;
2104

2105
    recheck_discard_flags(s, c->first_packet);
2106
    c->first_packet = 0;
2107

2108 2109 2110
    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
2111
         * stream */
2112
        if (pls->needed && !pls->pkt.data) {
2113 2114
            while (1) {
                int64_t ts_diff;
2115
                AVRational tb;
2116
                ret = av_read_frame(pls->ctx, &pls->pkt);
2117
                if (ret < 0) {
2118
                    if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
2119
                        return ret;
2120
                    reset_packet(&pls->pkt);
2121
                    break;
2122
                } else {
2123 2124 2125 2126 2127 2128
                    /* 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);
                    }

2129
                    if (c->first_timestamp == AV_NOPTS_VALUE &&
2130 2131
                        pls->pkt.dts       != AV_NOPTS_VALUE)
                        c->first_timestamp = av_rescale_q(pls->pkt.dts,
2132
                            get_timebase(pls), AV_TIME_BASE_Q);
2133 2134
                }

2135
                if (pls->seek_timestamp == AV_NOPTS_VALUE)
2136 2137
                    break;

2138 2139
                if (pls->seek_stream_index < 0 ||
                    pls->seek_stream_index == pls->pkt.stream_index) {
2140

2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154
                    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;
                    }
2155
                }
2156
                av_packet_unref(&pls->pkt);
2157 2158
            }
        }
2159
        /* Check if this stream has the packet with the lowest dts */
2160 2161 2162
        if (pls->pkt.data) {
            struct playlist *minpls = minplaylist < 0 ?
                                     NULL : c->playlists[minplaylist];
2163
            if (minplaylist < 0) {
2164
                minplaylist = i;
2165
            } else {
2166 2167
                int64_t dts     =    pls->pkt.dts;
                int64_t mindts  = minpls->pkt.dts;
2168

2169 2170
                if (dts == AV_NOPTS_VALUE ||
                    (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
2171
                    minplaylist = i;
2172
            }
2173 2174
        }
    }
2175

2176
    /* If we got a packet, return it */
2177
    if (minplaylist >= 0) {
2178
        struct playlist *pls = c->playlists[minplaylist];
2179 2180
        AVStream *ist;
        AVStream *st;
2181

2182 2183 2184 2185 2186 2187
        ret = update_streams_from_subdemuxer(s, pls);
        if (ret < 0) {
            av_packet_unref(&pls->pkt);
            return ret;
        }

2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198
        // If sub-demuxer reports updated metadata, copy it to the first stream
        // and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
        if (pls->ctx->event_flags & AVFMT_EVENT_FLAG_METADATA_UPDATED) {
            if (pls->n_main_streams) {
                st = pls->main_streams[0];
                av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
                st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
            }
            pls->ctx->event_flags &= ~AVFMT_EVENT_FLAG_METADATA_UPDATED;
        }

2199 2200 2201 2202 2203 2204
        /* check if noheader flag has been cleared by the subdemuxer */
        if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
            pls->has_noheader_flag = 0;
            update_noheader_flag(s);
        }

2205 2206 2207 2208 2209 2210 2211
        if (pls->pkt.stream_index >= pls->n_main_streams) {
            av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
                   pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
            av_packet_unref(&pls->pkt);
            return AVERROR_BUG;
        }

2212 2213 2214
        ist = pls->ctx->streams[pls->pkt.stream_index];
        st = pls->main_streams[pls->pkt.stream_index];

2215
        av_packet_move_ref(pkt, &pls->pkt);
2216
        pkt->stream_index = st->index;
2217 2218 2219

        if (pkt->dts != AV_NOPTS_VALUE)
            c->cur_timestamp = av_rescale_q(pkt->dts,
2220
                                            ist->time_base,
2221 2222
                                            AV_TIME_BASE_Q);

2223 2224
        /* There may be more situations where this would be useful, but this at least
         * handles newly probed codecs properly (i.e. request_probe by mpegts). */
2225 2226 2227 2228 2229 2230
        if (ist->codecpar->codec_id != st->codecpar->codec_id) {
            ret = set_stream_info_from_input_stream(st, pls, ist);
            if (ret < 0) {
                return ret;
            }
        }
2231

2232 2233
        return 0;
    }
2234
    return AVERROR_EOF;
2235 2236
}

2237
static int hls_read_seek(AVFormatContext *s, int stream_index,
2238 2239
                               int64_t timestamp, int flags)
{
2240
    HLSContext *c = s->priv_data;
2241 2242
    struct playlist *seek_pls = NULL;
    int i, seq_no;
2243 2244
    int j;
    int stream_subdemuxer_index;
2245
    int64_t first_timestamp, seek_timestamp, duration;
2246

2247
    if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
2248 2249
        return AVERROR(ENOSYS);

2250 2251 2252
    first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
                      0 : c->first_timestamp;

2253
    seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
2254 2255 2256 2257
                                    s->streams[stream_index]->time_base.den,
                                    flags & AVSEEK_FLAG_BACKWARD ?
                                    AV_ROUND_DOWN : AV_ROUND_UP);

2258 2259 2260 2261
    duration = s->duration == AV_NOPTS_VALUE ?
               0 : s->duration;

    if (0 < duration && duration < seek_timestamp - first_timestamp)
2262
        return AVERROR(EIO);
2263

2264
    /* find the playlist with the specified stream */
2265 2266
    for (i = 0; i < c->n_playlists; i++) {
        struct playlist *pls = c->playlists[i];
2267 2268 2269 2270 2271 2272
        for (j = 0; j < pls->n_main_streams; j++) {
            if (pls->main_streams[j] == s->streams[stream_index]) {
                seek_pls = pls;
                stream_subdemuxer_index = j;
                break;
            }
2273
        }
2274
    }
2275 2276 2277
    /* 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))
2278 2279
        return AVERROR(EIO);

2280 2281
    /* set segment now so we do not need to search again below */
    seek_pls->cur_seq_no = seq_no;
2282
    seek_pls->seek_stream_index = stream_subdemuxer_index;
2283

2284
    for (i = 0; i < c->n_playlists; i++) {
2285
        /* Reset reading */
2286
        struct playlist *pls = c->playlists[i];
2287
        ff_format_io_close(pls->parent, &pls->input);
2288
        pls->input_read_done = 0;
2289
        ff_format_io_close(pls->parent, &pls->input_next);
2290
        pls->input_next_requested = 0;
2291
        av_packet_unref(&pls->pkt);
2292
        pls->pb.eof_reached = 0;
2293
        /* Clear any buffered data */
2294
        pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
2295
        /* Reset the pos, to let the mpegts demuxer know we've seeked. */
2296
        pls->pb.pos = 0;
2297 2298
        /* Flush the packet queue of the subdemuxer. */
        ff_read_frame_flush(pls->ctx);
2299

2300 2301 2302
        pls->seek_timestamp = seek_timestamp;
        pls->seek_flags = flags;

2303 2304
        if (pls != seek_pls) {
            /* set closest segment seq_no for playlists not handled above */
2305
            find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
2306 2307 2308 2309 2310 2311
            /* 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;
        }
2312
    }
2313

2314 2315
    c->cur_timestamp = seek_timestamp;

2316
    return 0;
2317 2318
}

2319
static int hls_probe(const AVProbeData *p)
2320 2321 2322 2323 2324
{
    /* 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;
2325

2326 2327 2328 2329 2330 2331 2332
    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;
}

2333 2334 2335 2336
#define OFFSET(x) offsetof(HLSContext, x)
#define FLAGS AV_OPT_FLAG_DECODING_PARAM
static const AVOption hls_options[] = {
    {"live_start_index", "segment index to start live streams at (negative values are from the end)",
2337
        OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
2338 2339 2340 2341
    {"allowed_extensions", "List of file extensions that hls is allowed to access",
        OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
        {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
        INT_MIN, INT_MAX, FLAGS},
2342 2343
    {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
        OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2344
    {"m3u8_hold_counters", "The maximum number of times to load m3u8 when it refreshes without new segments",
2345
        OFFSET(m3u8_hold_counters), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
2346 2347
    {"http_persistent", "Use persistent HTTP connections",
        OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
2348
    {"http_multiple", "Use multiple HTTP connections for fetching segments",
2349
        OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
2350 2351
    {"http_seekable", "Use HTTP partial requests, 0 = disable, 1 = enable, -1 = auto",
        OFFSET(http_seekable), AV_OPT_TYPE_BOOL, { .i64 = -1}, -1, 1, FLAGS},
2352 2353 2354 2355
    {NULL}
};

static const AVClass hls_class = {
2356
    .class_name = "hls demuxer",
2357 2358 2359 2360 2361
    .item_name  = av_default_item_name,
    .option     = hls_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

2362
AVInputFormat ff_hls_demuxer = {
2363
    .name           = "hls",
2364
    .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
2365
    .priv_class     = &hls_class,
2366
    .priv_data_size = sizeof(HLSContext),
2367
    .flags          = AVFMT_NOGENSEARCH | AVFMT_TS_DISCONT,
2368 2369 2370 2371 2372
    .read_probe     = hls_probe,
    .read_header    = hls_read_header,
    .read_packet    = hls_read_packet,
    .read_close     = hls_close,
    .read_seek      = hls_read_seek,
2373
};