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VC1: Fix intensity compensation performance regression 

Fix https://trac.ffmpeg.org/ticket/3204

The problem was that intensity compensation was always used once it was
encountered. This is because v->next_use_ic was never set back to zero.
To fix this, when resetting v->next_luty/uv, also reset v->next_use_ic.

This improved (restored) performance by 85% when decoding
http://bit.ly/bbbwmv

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Mason Carter 2013-12-21 17:27:18 -08:00 committed by Michael Niedermayer
parent 5410a5dc66
commit ed5bed4152
1 changed files with 4 additions and 0 deletions
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4
libavcodec/vc1.c
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@ -610,6 +610,10 @@ static void rotate_luts(VC1Context *v)
INIT_LUT(32, 0, v->curr_luty[0], v->curr_lutuv[0], 0);
INIT_LUT(32, 0, v->curr_luty[1], v->curr_lutuv[1], 0);
v->curr_use_ic = 0;
if (v->curr_luty == v->next_luty) {
// If we just initialized next_lut, clear next_use_ic to match.
v->next_use_ic = 0;
}
}
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)