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imc: use exp2 instead of pow(2,...) 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-09-09 12:58:43 +02:00
parent eab438eabb
commit 363d302ea3
1 changed files with 2 additions and 1 deletions
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3
libavcodec/imc.c
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@ -40,6 +40,7 @@
#include "dsputil.h"
#include "fft.h"
#include "libavutil/audioconvert.h"
#include "libavutil/libm.h"
#include "sinewin.h"
#include "imcdata.h"
@ -341,7 +342,7 @@ static void imc_decode_level_coefficients(IMCContext *q, int *levlCoeffBuf,
float tmp, tmp2;
// maybe some frequency division thingy
flcoeffs1[0] = 20000.0 / pow (2, levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125
flcoeffs1[0] = 20000.0 / exp2 (levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125
flcoeffs2[0] = log2f(flcoeffs1[0]);
tmp = flcoeffs1[0];
tmp2 = flcoeffs2[0];