dca_lfe_fir(float *out, const float *in, const float *coefs,
int decifactor, float scale)
{
- float *out2 = out + decifactor;
+ float *out2 = out + 2*decifactor-1;
const float *cf0 = coefs;
- const float *cf1 = coefs + 256;
+ int num_coeffs = 256 / decifactor;
int j, k;
/* One decimated sample generates 2*decifactor interpolated ones */
for (k = 0; k < decifactor; k++) {
float v0 = 0.0;
float v1 = 0.0;
- for (j = 0; j < 256 / decifactor; j++) {
- float s = in[-j];
- v0 += s * *cf0++;
- v1 += s * *--cf1;
+ for (j = 0; j < num_coeffs; j++, cf0++) {
+ v0 += in[-j] * *cf0;
+ v1 += in[1+j-num_coeffs] * *cf0;
+
}
*out++ = v0 * scale;
- *out2++ = v1 * scale;
+ *out2-- = v1 * scale;
}
}