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mpegaudioenc: replace pow(2,.. by exp2(

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-09-13 22:08:00 +02:00
parent 51fa653829
commit c21f81999a
1 changed files with 3 additions and 3 deletions
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6
libavcodec/mpegaudioenc.c
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@ -148,16 +148,16 @@ static av_cold int MPA_encode_init(AVCodecContext *avctx)
}
for(i=0;i<64;i++) {
v = (int)(pow(2.0, (3 - i) / 3.0) * (1 << 20));
v = (int)(exp2((3 - i) / 3.0) * (1 << 20));
if (v <= 0)
v = 1;
scale_factor_table[i] = v;
#ifdef USE_FLOATS
scale_factor_inv_table[i] = pow(2.0, -(3 - i) / 3.0) / (float)(1 << 20);
scale_factor_inv_table[i] = exp2(-(3 - i) / 3.0) / (float)(1 << 20);
#else
#define P 15
scale_factor_shift[i] = 21 - P - (i / 3);
scale_factor_mult[i] = (1 << P) * pow(2.0, (i % 3) / 3.0);
scale_factor_mult[i] = (1 << P) * exp2((i % 3) / 3.0);
#endif
}
for(i=0;i<128;i++) {