> // Synthesis QMF Bank (14496-3 sp04 p206)
> // Downsampled Synthesis QMF Bank (14496-3 sp04 p206)
> static void sbr_qmf_synthesis(float *out, const float **X,
> const unsigned int div)
> {
> int k, l, n;
> float v[1280], w[640];
> for (l = 0; l < 32; l++) {
> memmove(&v[128 / div], v, (1280 - 128) / div * sizeof(float));
> for (n = 0; n < 128 / div; n++) {
> v[n] = X[0][l] * cosf((2.0f * n - 255.0f / div) * M_PI / (256.0f
> / div));
Since this isn't LP SBR shouldn't this be
v[n] = X[0][l][0] * cosf((2.0f * n - 255.0f / div) * M_PI
/ (256.0f / div)) -
X[0][l][1] * sinf((2.0f * n - 255.0f / div) * M_PI
/ (256.0f / div));
> for (k = 1; k < 64 / div; k++) {
> v[n] += X[k][l] * cosf((k + 0.5f) * (2.0f * n - 255.0f / div)
> * M_PI / (128.0f / div));
> }
> v[n] /= 64.0f * 64 / div;
> }
> for (n = 0; n <= 4; n++) {
> int temp1 = 128 / div * n, temp2 = temp1 << 1;
> for (k = 0; k < 64 / div; k++) {
> w[temp1 + k] = v[temp2 + k] *
> sbr_qmf_window[temp1 + k];
> w[temp1 + k + 64 / div] = v[temp2 + k + 192 / div] *
> sbr_qmf_window[temp1 + k + 64 / div];
> }
> }
> for (k = 0; k < 64 / div; k++) {
> out[k] = w[k] + w[64 / div + k] + w[128 / div + k] +
> w[192 / div + k] + w[256 / div + k]
> + w[320 / div + k] + w[384 / div + k] + w[448 / div + k] +
> w[512 / div + k] + w[576 / div + k];
> }
> out += 64 / div;
> }
> }
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