On 1/5/16, Ganesh Ajjanagadde <gajjanaga...@gmail.com> wrote: > sqrt is faster, and is sometimes more accurate depending on the libm. > > Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com> > --- > libavfilter/af_compensationdelay.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/libavfilter/af_compensationdelay.c > b/libavfilter/af_compensationdelay.c > index 33ee7e4..d5a3484 100644 > --- a/libavfilter/af_compensationdelay.c > +++ b/libavfilter/af_compensationdelay.c > @@ -57,7 +57,7 @@ AVFILTER_DEFINE_CLASS(compensationdelay); > // The maximum distance for options > #define COMP_DELAY_MAX_DISTANCE (100.0 * 100.0 + 100.0 * 1.0 + > 1.0) > // The actual speed of sound in normal conditions > -#define COMP_DELAY_SOUND_SPEED_KM_H(temp) 1.85325 * (643.95 * pow(((temp + > 273.15) / 273.15), 0.5)) > +#define COMP_DELAY_SOUND_SPEED_KM_H(temp) 1.85325 * (643.95 * sqrt(((temp > + 273.15) / 273.15))) > #define COMP_DELAY_SOUND_SPEED_CM_S(temp) > (COMP_DELAY_SOUND_SPEED_KM_H(temp) * (1000.0 * 100.0) /* cm/km */ / (60.0 * > 60.0) /* s/h */) > #define COMP_DELAY_SOUND_FRONT_DELAY(temp) (1.0 / > COMP_DELAY_SOUND_SPEED_CM_S(temp)) > // The maximum delay may be reached by this filter > -- > 2.6.4 > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >
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