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Added rounding to highbitdepth subtraction

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This improves encoding performance for high
bitrate sequences when using 10 or 12bit.

Change-Id: I358d30a69251d58589c075b7d52c0d9ae76b26ee
This commit is contained in:
Peter de Rivaz
2014-05-12 11:54:09 +01:00
parent 99e1518a16
commit c4a5ef1ced
1 changed files with 5 additions and 1 deletions
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6
vp9/encoder/vp9_encodemb.c
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@@ -61,9 +61,13 @@ void vp9_high_subtract_block_c(int rows, int cols,
int shift = bps - 8; int shift = bps - 8;
uint16_t *src = CONVERT_TO_SHORTPTR(src8); uint16_t *src = CONVERT_TO_SHORTPTR(src8);
uint16_t *pred = CONVERT_TO_SHORTPTR(pred8); uint16_t *pred = CONVERT_TO_SHORTPTR(pred8);
int rnd = 0;
if (shift >= 1) {
rnd = 1 << (shift - 1);
}
for (r = 0; r < rows; r++) { for (r = 0; r < rows; r++) {
for (c = 0; c < cols; c++) { for (c = 0; c < cols; c++) {
diff[c] = ((int)src[c] - (int)pred[c]) >> shift; diff[c] = ((int)src[c] - (int)pred[c] + rnd) >> shift;
} }
diff += diff_stride; diff += diff_stride;