int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
                            VLC *vlc,
                            const uint16_t *level_table, const uint16_t *run_table,
                            int version, WMACoef *ptr, int offset,
                            int num_coefs, int block_len, int frame_len_bits,
                            int coef_nb_bits)
{
    int code, level, sign;
    const unsigned int coef_mask = block_len - 1;
    for (; offset < num_coefs; offset++) {
        code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
        if (code > 1) {
            /** normal code */
            offset += run_table[code];
            level = level_table[code];
        } else if (code == 1) {
            /* EOB */
            break;
        } else {
            /* escape */
            if (!version) {
                level = get_bits(gb, coef_nb_bits);
                /* NOTE: this is rather suboptimal. reading
                   block_len_bits would be better */
                offset += get_bits(gb, frame_len_bits);
            } else {
                level = ff_wma_get_large_val(gb);
                /** escape decode */
                if (get_bits1(gb)) {
                    if (get_bits1(gb)) {
                        if (get_bits1(gb)) {
                            av_log(avctx,AV_LOG_ERROR,
                                "broken escape sequence\n");
                            return -1;
                        } else
                            offset += get_bits(gb, frame_len_bits) + 4;
                    } else
                        offset += get_bits(gb, 2) + 1;
                }
            }
        }
        sign = get_bits1(gb) - 1;
        ptr[offset & coef_mask] = (level^sign) - sign;
    }
    /** NOTE: EOB can be omitted */
    if (offset > num_coefs) {
        av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");
        return -1;
    }

    return 0;
}