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lavc/atrac3plusdsp: change pow(2,x) to exp2f(x) 

Much faster generation possible; but array is small so don't want to bloat
the binary.

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 13:38:43 -05:00
parent 89189b1010
commit 9254e6176c
1 changed files with 2 additions and 1 deletions
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3
libavcodec/atrac3plusdsp.c
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@ -28,6 +28,7 @@
#include <math.h>
#include "libavutil/float_dsp.h"
#include "libavutil/libm.h"
#include "avcodec.h"
#include "sinewin.h"
#include "fft.h"
@ -107,7 +108,7 @@ av_cold void ff_atrac3p_init_wave_synth(void)
/* generate amplitude scalefactors table */
for (i = 0; i < 64; i++)
amp_sf_tab[i] = pow(2.0f, ((double)i - 3) / 4.0f);
amp_sf_tab[i] = exp2f((i - 3) / 4.0f);
}
/**