static void subband_scale(int *dst, int *src, int scale, int offset, int len) { int ssign = scale < 0 ? -1 : 1; int s = FFABS(scale); unsigned int round; int i, out, c = exp2tab[s & 3]; s = offset - (s >> 2); if (s > 31) { for (i=0; i<len; i++) { dst[i] = 0; } } else if (s > 0) { round = 1 << (s-1); for (i=0; i<len; i++) { out = (int)(((int64_t)src[i] * c) >> 32); dst[i] = ((int)(out+round) >> s) * ssign; } } else { s = s + 32; round = 1U << (s-1); for (i=0; i<len; i++) { out = (int)((int64_t)((int64_t)src[i] * c + round) >> s); dst[i] = out * ssign; } } }