Function ff_parse_a53_cc

libavcodec/atsc_a53.c:69–120

}

int ff_parse_a53_cc(AVBufferRef **pbuf, const uint8_t *data, int size)
{
    AVBufferRef *buf = *pbuf;
    GetBitContext gb;
    size_t new_size, old_size = buf ? buf->size : 0;
    int ret, cc_count;

    if (size < 3)
        return AVERROR_INVALIDDATA;

    ret = init_get_bits8(&gb, data, size);
    if (ret < 0)
        return ret;

    if (get_bits(&gb, 8) != 0x3) // user_data_type_code
        return 0;

    skip_bits(&gb, 1); // reserved
    if (!get_bits(&gb, 1)) // process_cc_data_flag
        return 0;

    skip_bits(&gb, 1); // zero bit
    cc_count = get_bits(&gb, 5);
    if (!cc_count)
        return 0;

    skip_bits(&gb, 8); // reserved

    /* 3 bytes per CC plus one byte marker_bits at the end */
    if (cc_count * 3 >= (get_bits_left(&gb) >> 3))
        return AVERROR_INVALIDDATA;

    new_size = (old_size + cc_count * 3);

    if (new_size > INT_MAX)
        return AVERROR_INVALIDDATA;

    /* Allow merging of the cc data from two fields. */
    ret = av_buffer_realloc(pbuf, new_size);
    if (ret < 0)
        return ret;

    buf = *pbuf;
    /* Use of av_buffer_realloc assumes buffer is writeable */
    for (int i = 0; i < cc_count; i++) {
        buf->data[old_size++] = get_bits(&gb, 8);
        buf->data[old_size++] = get_bits(&gb, 8);
        buf->data[old_size++] = get_bits(&gb, 8);
    }

    return cc_count;
}