static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,

                              float *out, float X[2][38][64],

                              float mdct_buf[2][64],

                              float *v0, int *v_off, const unsigned int div)

{

    int i, n;

    const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;

    const int step = 128 >> div;

    float *v;

    for (i = 0; i < 32; i++) {

        if (*v_off < step) {

            int saved_samples = (1280 - 128) >> div;

            memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));

            *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;

        } else {

            *v_off -= step;

        }

        v = v0 + *v_off;

        if (div) {

            for (n = 0; n < 32; n++) {

                X[0][i][   n] = -X[0][i][n];

                X[0][i][32+n] =  X[1][i][31-n];

            }

            mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

            for (n = 0; n < 32; n++) {

                v[     n] =  mdct_buf[0][63 - 2*n];

                v[63 - n] = -mdct_buf[0][62 - 2*n];

            }

        } else {

            for (n = 1; n < 64; n+=2) {

                X[1][i][n] = -X[1][i][n];

            }

            mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

            mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);

            for (n = 0; n < 64; n++) {

                v[      n] = -mdct_buf[0][63 -   n] + mdct_buf[1][  n    ];

                v[127 - n] =  mdct_buf[0][63 -   n] + mdct_buf[1][  n    ];

            }

        }

        dsp->vector_fmul_add(out, v                , sbr_qmf_window               , zero64, 64 >> div);

        dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out   , 64 >> div);

        dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out   , 64 >> div);

        out += 64 >> div;

    }

}
