[FFmpeg-cvslog] r10482 - trunk/doc/snow.txt
michael
subversion
Thu Sep 13 00:26:26 CEST 2007
Author: michael
Date: Thu Sep 13 00:26:26 2007
New Revision: 10482
Log:
make intra dc prediction less contradictionary
Modified:
trunk/doc/snow.txt
Modified: trunk/doc/snow.txt
==============================================================================
--- trunk/doc/snow.txt (original)
+++ trunk/doc/snow.txt Thu Sep 13 00:26:26 2007
@@ -96,9 +96,9 @@ prediction:
block(0)
block(level):
+ mvx_diff=mvy_diff=y_diff=cb_diff=cr_diff=0
if(keyframe){
intra=1
- y_diff=cb_diff=cr_diff=0
}else{
if(level!=max_block_depth){
s_context= 2*left->level + 2*top->level + topleft->level + topright->level
@@ -333,9 +333,9 @@ the luma and chroma values of the left b
the used luma and chroma is the sum of the predictor and y_diff, cb_diff, cr_diff
to reverse this in the decoder apply the following:
-block[y][x].dc[0] += block[y][x-1].dc[0];
-block[y][x].dc[1] += block[y][x-1].dc[1];
-block[y][x].dc[2] += block[y][x-1].dc[2];
+block[y][x].dc[0] = block[y][x-1].dc[0] + y_diff;
+block[y][x].dc[1] = block[y][x-1].dc[1] + cb_diff;
+block[y][x].dc[2] = block[y][x-1].dc[2] + cr_diff;
block[*][-1].dc[*]= 128;
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