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avcodec/dcadec: make dca_dmix_code() 650% faster

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This effectively replaces the ldexpf() function call by a multiplication
with a constant.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-05-23 21:59:04 +02:00
parent 9340ced47b
commit 6da06ef6bb
1 changed files with 1 additions and 1 deletions
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libavcodec/dcadec.c
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@ -2107,7 +2107,7 @@ static float dca_dmix_code(unsigned code)
{ {
int sign = (code >> 8) - 1; int sign = (code >> 8) - 1;
code &= 0xff; code &= 0xff;
return ldexpf((dca_dmixtable[code] ^ sign) - sign, -15); return ((dca_dmixtable[code] ^ sign) - sign) * pow(2, -15);
} }
/** /**