pulseaudio/src/tests/voltest.c

#include <stdio.h>

#include <pulse/volume.h>
#include <pulse/gccmacro.h>

int main(int argc, char *argv[]) {
    pa_volume_t v;

    for (v = PA_VOLUME_MUTED; v <= PA_VOLUME_NORM*2; v += 256) {

        double dB = pa_sw_volume_to_dB(v);
        double f = pa_sw_volume_to_linear(v);

        printf("Volume: %3i; percent: %i%%; decibel %0.2f; linear = %0.2f; volume(decibel): %3i; volume(linear): %3i\n",
               v, (v*100)/PA_VOLUME_NORM, dB, f, pa_sw_volume_from_dB(dB), pa_sw_volume_from_linear(f));

    }

    return 0;
}