static void svq3_add_idct_c(uint8_t *dst, int16_t *block, int stride, int qp, int dc) { const int qmul = svq3_dequant_coeff[qp]; int i; if (dc) { dc = 13 * 13 * (dc == 1 ? 1538U* block[0] : qmul * (block[0] >> 3) / 2); block[0] = 0; } for (i = 0; i < 4; i++) { const int z0 = 13 * (block[0 + 4 * i] + block[2 + 4 * i]); const int z1 = 13 * (block[0 + 4 * i] - block[2 + 4 * i]); const int z2 = 7 * block[1 + 4 * i] - 17 * block[3 + 4 * i]; const int z3 = 17 * block[1 + 4 * i] + 7 * block[3 + 4 * i]; block[0 + 4 * i] = z0 + z3; block[1 + 4 * i] = z1 + z2; block[2 + 4 * i] = z1 - z2; block[3 + 4 * i] = z0 - z3; } for (i = 0; i < 4; i++) { const unsigned z0 = 13 * (block[i + 4 * 0] + block[i + 4 * 2]); const unsigned z1 = 13 * (block[i + 4 * 0] - block[i + 4 * 2]); const unsigned z2 = 7 * block[i + 4 * 1] - 17 * block[i + 4 * 3]; const unsigned z3 = 17 * block[i + 4 * 1] + 7 * block[i + 4 * 3]; const int rr = (dc + 0x80000); dst[i + stride * 0] = av_clip_uint8(dst[i + stride * 0] + ((int)((z0 + z3) * qmul + rr) >> 20)); dst[i + stride * 1] = av_clip_uint8(dst[i + stride * 1] + ((int)((z1 + z2) * qmul + rr) >> 20)); dst[i + stride * 2] = av_clip_uint8(dst[i + stride * 2] + ((int)((z1 - z2) * qmul + rr) >> 20)); dst[i + stride * 3] = av_clip_uint8(dst[i + stride * 3] + ((int)((z0 - z3) * qmul + rr) >> 20)); } memset(block, 0, 16 * sizeof(int16_t)); }