ffmpeg | branch: master | Ganesh Ajjanagadde <gajjanaga...@gmail.com> | Fri Jan 15 13:45:30 2016 -0500| [cea529dd7f0d2d7fd1c7f33c5f778a051eedfaf9] | committer: Ganesh Ajjanagadde
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 <mich...@niedermayer.cc> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cea529dd7f0d2d7fd1c7f33c5f778a051eedfaf9 --- libavcodec/opus_celt.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libavcodec/opus_celt.c b/libavcodec/opus_celt.c index 474452f..61a9dc6 100644 --- a/libavcodec/opus_celt.c +++ b/libavcodec/opus_celt.c @@ -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); _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
