Function init_subtitle_context

libavformat/hls.c:1803–1836

}

static int init_subtitle_context(struct playlist *pls)
{
    HLSContext *c = pls->parent->priv_data;
    const AVInputFormat *in_fmt;
    AVDictionary *opts = NULL;
    int ret;

    if (!(pls->ctx = avformat_alloc_context()))
        return AVERROR(ENOMEM);

    pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
    if (!pls->read_buffer) {
        avformat_free_context(pls->ctx);
        pls->ctx = NULL;
        return AVERROR(ENOMEM);
    }

    ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
                      read_data_subtitle_segment, NULL, NULL);
    pls->pb.pub.seekable = 0;
    pls->ctx->pb       = &pls->pb.pub;
    pls->ctx->io_open  = nested_io_open;

    ret = ff_copy_whiteblacklists(pls->ctx, pls->parent);
    if (ret < 0)
        return ret;

    in_fmt = av_find_input_format("webvtt");
    av_dict_copy(&opts, c->seg_format_opts, 0);
    ret = avformat_open_input(&pls->ctx, current_segment(pls)->url, in_fmt, &opts);
    av_dict_free(&opts);

    return ret;
}

static int read_subtitle_packet(struct playlist *v, AVPacket *pkt)
{