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more complete dc prediction description

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Originally committed as revision 10177 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Michael Niedermayer 2007-08-21 19:44:05 +00:00
parent 1e37b7e407
commit 2cc454705b
1 changed files with 5 additions and 0 deletions
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doc/snow.txt
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@ -225,6 +225,11 @@ Intra DC Predicton:
the luma and chroma values of the left block are used as predictors
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[*][-1].dc[*]= 128;
Motion Compensation: