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| author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2016-01-04 18:40:19 -0800 |
|---|---|---|
| committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2016-01-05 19:07:19 -0800 |
| commit | fc703f53cf3b0ca3806ecbf20d456f36b04249af (patch) | |
| tree | bdeaad3e27ddda6722a0ee3c5614a408df20fb58 /libavfilter/af_compensationdelay.c | |
| parent | a956840cbcf89d709c4bd5980808ac0b5c8aeedf (diff) | |
| download | ffmpeg-fc703f53cf3b0ca3806ecbf20d456f36b04249af.tar.gz | |
lavfi/af_compensationdelay: replace pow(x,0.5) by sqrt(x)
sqrt is faster, and is sometimes more accurate depending on the libm.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Diffstat (limited to 'libavfilter/af_compensationdelay.c')
| -rw-r--r-- | libavfilter/af_compensationdelay.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavfilter/af_compensationdelay.c b/libavfilter/af_compensationdelay.c index 33ee7e4996..d5a3484317 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 |