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lavc/opus_celt: replace pow(2,x) by exp2f(x) 

Faster methods possible; since exponent is always a multiple of 1/8.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2016-01-15 13:45:30 -05:00
parent 9254e6176c
commit cea529dd7f
1 changed files with 2 additions and 1 deletions
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3
libavcodec/opus_celt.c
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@ -27,6 +27,7 @@
#include <stdint.h>
#include "libavutil/float_dsp.h"
#include "libavutil/libm.h"
#include "imdct15.h"
#include "opus.h"
@ -1839,7 +1840,7 @@ static void process_anticollapse(CeltContext *s, CeltFrame *frame, float *X)
/* depth in 1/8 bits */
depth = (1 + s->pulses[i]) / (celt_freq_range[i] << s->duration);
thresh = pow(2, -1.0 - 0.125f * depth);
thresh = exp2f(-1.0 - 0.125f * depth);
sqrt_1 = 1.0f / sqrtf(celt_freq_range[i] << s->duration);
xptr = X + (celt_freq_bands[i] << s->duration);