static int decode_block(BinkAudioContext *s, short *out, int use_dct)
{
    int ch, i, j, k;
    float q, quant[25];
    int width, coeff;
    GetBitContext *gb = &s->gb;

    if (use_dct)
        skip_bits(gb, 2);

    for (ch = 0; ch < s->channels; ch++) {
        FFTSample *coeffs = s->coeffs_ptr[ch];
        if (s->version_b) {
            if (get_bits_left(gb) < 64)
                return AVERROR_INVALIDDATA;
            coeffs[0] = av_int2flt(get_bits(gb, 32)) * s->root;
            coeffs[1] = av_int2flt(get_bits(gb, 32)) * s->root;
        } else {
            if (get_bits_left(gb) < 58)
                return AVERROR_INVALIDDATA;
            coeffs[0] = get_float(gb) * s->root;
            coeffs[1] = get_float(gb) * s->root;
        }

        if (get_bits_left(gb) < s->num_bands * 8)
            return AVERROR_INVALIDDATA;
        for (i = 0; i < s->num_bands; i++) {
            /* constant is result of 0.066399999/log10(M_E) */
            int value = get_bits(gb, 8);
            quant[i] = expf(FFMIN(value, 95) * 0.15289164787221953823f) * s->root;
        }

        k = 0;
        q = quant[0];

        // parse coefficients
        i = 2;
        while (i < s->frame_len) {
            if (s->version_b) {
                j = i + 16;
            } else {
                int v;
                GET_BITS_SAFE(v, 1);
                if (v) {
                    GET_BITS_SAFE(v, 4);
                    j = i + rle_length_tab[v] * 8;
                } else {
                    j = i + 8;
                }
            }

            j = FFMIN(j, s->frame_len);

            GET_BITS_SAFE(width, 4);
            if (width == 0) {
                memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
                i = j;
                while (s->bands[k] < i)
                    q = quant[k++];
            } else {
                while (i < j) {
                    if (s->bands[k] == i)
                        q = quant[k++];
                    GET_BITS_SAFE(coeff, width);
                    if (coeff) {
                        int v;
                        GET_BITS_SAFE(v, 1);
                        if (v)
                            coeffs[i] = -q * coeff;
                        else
                            coeffs[i] =  q * coeff;
                    } else {
                        coeffs[i] = 0.0f;
                    }
                    i++;
                }
            }
        }

        if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
            coeffs[0] /= 0.5;
            s->trans.dct.dct_calc(&s->trans.dct,  coeffs);
            s->dsp.vector_fmul_scalar(coeffs, coeffs, s->frame_len / 2, s->frame_len);
        }
        else if (CONFIG_BINKAUDIO_RDFT_DECODER)
            s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs);
    }

    s->fmt_conv.float_to_int16_interleave(out, (const float **)s->coeffs_ptr,
                                          s->frame_len, s->channels);

    if (!s->first) {
        int count = s->overlap_len * s->channels;
        int shift = av_log2(count);
        for (i = 0; i < count; i++) {
            out[i] = (s->previous[i] * (count - i) + out[i] * i) >> shift;
        }
    }

    memcpy(s->previous, out + s->block_size,
           s->overlap_len * s->channels * sizeof(*out));

    s->first = 0;

    return 0;
}