for (n = 0; n < buffer_length; n++) {
int sum = -rounder, sum1;
for (i = 1; i <= filter_length; i++)
- sum += filter_coeffs[i-1] * out[n-i];
+ sum += (unsigned)(filter_coeffs[i-1] * out[n-i]);
sum1 = ((-sum >> 12) + in[n]) >> shift;
sum = av_clip_int16(sum1);