diff options
Diffstat (limited to 'vp8/encoder')
| -rw-r--r-- | vp8/encoder/dct.c | 63 |
1 files changed, 24 insertions, 39 deletions
diff --git a/vp8/encoder/dct.c b/vp8/encoder/dct.c index c2f2d1117..e7505619a 100644 --- a/vp8/encoder/dct.c +++ b/vp8/encoder/dct.c @@ -13,10 +13,6 @@ #include "vpx_ports/config.h" - - - - void vp8_short_fdct8x8_c(short *block, short *coefs, int pitch) { int j1, i, j, k; @@ -181,52 +177,41 @@ void vp8_short_walsh4x4_c(short *input, short *output, int pitch) { int i; int a1, b1, c1, d1; - int a2, b2, c2, d2; short *ip = input; short *op = output; - + int pitch_short = pitch >>1; for (i = 0; i < 4; i++) { - a1 = ((ip[0] + ip[2])); - d1 = ((ip[1] + ip[3])); - c1 = ((ip[1] - ip[3])); - b1 = ((ip[0] - ip[2])); - - op[0] = a1 + d1; - op[1] = b1 + c1; - op[2] = b1 - c1; - op[3] = a1 - d1; - ip += pitch / 2; - op += 4; - } + a1 = ip[0 * pitch_short] + ip[3 * pitch_short]; + b1 = ip[1 * pitch_short] + ip[2 * pitch_short]; + c1 = ip[1 * pitch_short] - ip[2 * pitch_short]; + d1 = ip[0 * pitch_short] - ip[3 * pitch_short]; + op[0] = (a1 + b1 + 1)>>1; + op[4] = (c1 + d1)>>1; + op[8] = (a1 - b1)>>1; + op[12]= (d1 - c1)>>1; + + ip++; + op++; + } ip = output; op = output; for (i = 0; i < 4; i++) { - a1 = ip[0] + ip[8]; - d1 = ip[4] + ip[12]; - c1 = ip[4] - ip[12]; - b1 = ip[0] - ip[8]; - - a2 = a1 + d1; - b2 = b1 + c1; - c2 = b1 - c1; - d2 = a1 - d1; - - a2 += a2<0; - b2 += b2<0; - c2 += c2<0; - d2 += d2<0; - - op[0] = (a2+1) >> 2; - op[4] = (b2+1) >> 2; - op[8] = (c2+1) >> 2; - op[12]= (d2+1) >> 2; + a1 = ip[0] + ip[3]; + b1 = ip[1] + ip[2]; + c1 = ip[1] - ip[2]; + d1 = ip[0] - ip[3]; - ip++; - op++; + op[0] = (a1 + b1 + 1)>>1; + op[1] = (c1 + d1)>>1; + op[2] = (a1 - b1)>>1; + op[3] = (d1 - c1)>>1; + + ip += 4; + op += 4; } } |