Function update_init_section

libavformat/dashdec.c:1755–1799

}

static int update_init_section(struct representation *pls)
{
    static const int max_init_section_size = 1024 * 1024;
    DASHContext *c = pls->parent->priv_data;
    int64_t sec_size;
    int64_t urlsize;
    int ret;

    if (!pls->init_section || pls->init_sec_buf)
        return 0;

    ret = open_input(c, pls, pls->init_section);
    if (ret < 0) {
        av_log(pls->parent, AV_LOG_WARNING,
               "Failed to open an initialization section\n");
        return ret;
    }

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

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

    sec_size = FFMIN(sec_size, max_init_section_size);

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

    ret = read_from_url(pls, pls->init_section, pls->init_sec_buf,
                        pls->init_sec_buf_size);
    ff_format_io_close(pls->parent, &pls->input);

    if (ret < 0)
        return ret;

    pls->init_sec_data_len = ret;
    pls->init_sec_buf_read_offset = 0;

    return 0;
}

static int64_t seek_data(void *opaque, int64_t offset, int whence)
{