diff options
Diffstat (limited to 'polyp/sample.c')
-rw-r--r-- | polyp/sample.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/polyp/sample.c b/polyp/sample.c index edfe1959..3019f93b 100644 --- a/polyp/sample.c +++ b/polyp/sample.c @@ -25,6 +25,7 @@ #include <stdio.h> #include <assert.h> +#include <math.h> #include "sample.h" @@ -104,3 +105,17 @@ pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b) { return (pa_volume_t) p; } + +pa_volume_t pa_volume_from_dB(double f) { + if (f <= -200) + return PA_VOLUME_MUTED; + + return (pa_volume_t) (pow(10, f/20)*PA_VOLUME_NORM); +} + +double pa_volume_to_dB(pa_volume_t v) { + if (v == PA_VOLUME_MUTED) + return -200; + + return 20*log10((double) v/PA_VOLUME_NORM); +} |