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| author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2016-01-15 13:38:43 -0500 |
|---|---|---|
| committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2016-01-22 19:26:41 +0530 |
| commit | 9254e6176c1a7e1498f1305619f46a3ab979816f (patch) | |
| tree | 861d9d4a8a563cf305febc8e13c817a13d17ec23 | |
| parent | 89189b1010ded0a6cbc487ae36f2f95409aa699f (diff) | |
| download | ffmpeg-9254e6176c1a7e1498f1305619f46a3ab979816f.tar.gz | |
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>
| -rw-r--r-- | libavcodec/atrac3plusdsp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/libavcodec/atrac3plusdsp.c b/libavcodec/atrac3plusdsp.c index 17c6437707..d089588274 100644 --- a/libavcodec/atrac3plusdsp.c +++ b/libavcodec/atrac3plusdsp.c @@ -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); } /** |