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avcodec/diracdec: Handle the 0 vlc case at the top of coeff_unpack_golomb() 

decoding changes from 17 to 20 fps

Reviewed-by; Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-01-12 23:32:58 +01:00
parent bbd9771625
commit 39fb3f18c5
1 changed files with 12 additions and 6 deletions
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18
libavcodec/diracdec.c
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@ -491,6 +491,12 @@ static inline int coeff_unpack_golomb(GetBitContext *gb, int qfactor, int qoffse
UPDATE_CACHE(re, gb);
buf = GET_CACHE(re, gb);
if (buf & 0x80000000) {
LAST_SKIP_BITS(re,gb,1);
CLOSE_READER(re, gb);
return 0;
}
if (buf & 0xAA800000) {
buf >>= 32 - 8;
SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
@ -516,12 +522,12 @@ static inline int coeff_unpack_golomb(GetBitContext *gb, int qfactor, int qoffse
coeff = ret - 1;
}
if (coeff) {
coeff = (coeff * qfactor + qoffset) >> 2;
sign = SHOW_SBITS(re, gb, 1);
LAST_SKIP_BITS(re, gb, 1);
coeff = (coeff ^ sign) - sign;
}
coeff = (coeff * qfactor + qoffset) >> 2;
sign = SHOW_SBITS(re, gb, 1);
LAST_SKIP_BITS(re, gb, 1);
coeff = (coeff ^ sign) - sign;
CLOSE_READER(re, gb);
return coeff;
}