From 1da6ea39542424ddb691dc6cf08d611a4c6db247 Mon Sep 17 00:00:00 2001 From: "Ronald S. Bultje" Date: Wed, 16 Feb 2011 14:18:21 -0500 Subject: VC1: transpose IDCT 8x8 coeffs while reading. --- libavcodec/vc1dsp.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) (limited to 'libavcodec/vc1dsp.c') diff --git a/libavcodec/vc1dsp.c b/libavcodec/vc1dsp.c index aab1694797..fd740e12d4 100644 --- a/libavcodec/vc1dsp.c +++ b/libavcodec/vc1dsp.c @@ -203,25 +203,25 @@ static void vc1_inv_trans_8x8_c(DCTELEM block[64]) { int i; register int t1,t2,t3,t4,t5,t6,t7,t8; - DCTELEM *src, *dst; + DCTELEM *src, *dst, temp[64]; src = block; - dst = block; + dst = temp; for(i = 0; i < 8; i++){ - t1 = 12 * (src[0] + src[4]) + 4; - t2 = 12 * (src[0] - src[4]) + 4; - t3 = 16 * src[2] + 6 * src[6]; - t4 = 6 * src[2] - 16 * src[6]; + t1 = 12 * (src[ 0] + src[32]) + 4; + t2 = 12 * (src[ 0] - src[32]) + 4; + t3 = 16 * src[16] + 6 * src[48]; + t4 = 6 * src[16] - 16 * src[48]; t5 = t1 + t3; t6 = t2 + t4; t7 = t2 - t4; t8 = t1 - t3; - t1 = 16 * src[1] + 15 * src[3] + 9 * src[5] + 4 * src[7]; - t2 = 15 * src[1] - 4 * src[3] - 16 * src[5] - 9 * src[7]; - t3 = 9 * src[1] - 16 * src[3] + 4 * src[5] + 15 * src[7]; - t4 = 4 * src[1] - 9 * src[3] + 15 * src[5] - 16 * src[7]; + t1 = 16 * src[ 8] + 15 * src[24] + 9 * src[40] + 4 * src[56]; + t2 = 15 * src[ 8] - 4 * src[24] - 16 * src[40] - 9 * src[56]; + t3 = 9 * src[ 8] - 16 * src[24] + 4 * src[40] + 15 * src[56]; + t4 = 4 * src[ 8] - 9 * src[24] + 15 * src[40] - 16 * src[56]; dst[0] = (t5 + t1) >> 3; dst[1] = (t6 + t2) >> 3; @@ -232,11 +232,11 @@ static void vc1_inv_trans_8x8_c(DCTELEM block[64]) dst[6] = (t6 - t2) >> 3; dst[7] = (t5 - t1) >> 3; - src += 8; + src += 1; dst += 8; } - src = block; + src = temp; dst = block; for(i = 0; i < 8; i++){ t1 = 12 * (src[ 0] + src[32]) + 64; -- cgit v1.2.3