From 8af915c21b03187ebe11823676081f6311fdbe5e Mon Sep 17 00:00:00 2001 From: "Ronald S. Bultje" Date: Fri, 1 Feb 2013 11:04:50 -0800 Subject: [PATCH] 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: Michael Niedermayer --- libavcodec/vp56.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/libavcodec/vp56.c b/libavcodec/vp56.c index 7df5adade3..6cc377036c 100644 --- a/libavcodec/vp56.c +++ b/libavcodec/vp56.c @@ -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(VP56Context *s)