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vp56: Remove clear_blocks call, and clear alpha plane U/V DC only 

The non-alpha and alpha-Y planes are cleared in the idct_put/add()
calls. For the alpha U/V planes, we only care about the DC for entropy
context prediction purposes, the rest of the data is unused.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Ronald S. Bultje 2013-02-01 11:04:50 -08:00 committed by Martin Storsjö
parent 9acd23d655
commit f859678f3f
1 changed files with 5 additions and 2 deletions
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7
libavcodec/vp56.c
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@ -394,8 +394,6 @@ static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
mb_type = vp56_decode_mv(s, row, col);
ref_frame = vp56_reference_frame[mb_type];
s->dsp.clear_blocks(*s->block_coeff);
s->parse_coeff(s);
vp56_add_predictors_dc(s, ref_frame);
@ -448,6 +446,11 @@ static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
}
break;
}
if (is_alpha) {
s->block_coeff[4][0] = 0;
s->block_coeff[5][0] = 0;
}
}
static int vp56_size_changed(AVCodecContext *avctx)