static void vp7_idct_add_c(uint8_t *dst, int16_t block[16], ptrdiff_t stride) { int i, a1, b1, c1, d1; int16_t tmp[16]; for (i = 0; i < 4; i++) { a1 = (block[i * 4 + 0] + block[i * 4 + 2]) * 23170; b1 = (block[i * 4 + 0] - block[i * 4 + 2]) * 23170; c1 = block[i * 4 + 1] * 12540 - block[i * 4 + 3] * 30274; d1 = block[i * 4 + 1] * 30274 + block[i * 4 + 3] * 12540; AV_ZERO64(block + i * 4); tmp[i * 4 + 0] = (a1 + d1) >> 14; tmp[i * 4 + 3] = (a1 - d1) >> 14; tmp[i * 4 + 1] = (b1 + c1) >> 14; tmp[i * 4 + 2] = (b1 - c1) >> 14; } for (i = 0; i < 4; i++) { a1 = (tmp[i + 0] + tmp[i + 8]) * 23170; b1 = (tmp[i + 0] - tmp[i + 8]) * 23170; c1 = tmp[i + 4] * 12540 - tmp[i + 12] * 30274; d1 = tmp[i + 4] * 30274 + tmp[i + 12] * 12540; dst[0 * stride + i] = av_clip_uint8(dst[0 * stride + i] + ((a1 + d1 + 0x20000) >> 18)); dst[3 * stride + i] = av_clip_uint8(dst[3 * stride + i] + ((a1 - d1 + 0x20000) >> 18)); dst[1 * stride + i] = av_clip_uint8(dst[1 * stride + i] + ((b1 + c1 + 0x20000) >> 18)); dst[2 * stride + i] = av_clip_uint8(dst[2 * stride + i] + ((b1 - c1 + 0x20000) >> 18)); } }