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volume: guarantee dB/linear conversion is reversible

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This commit is contained in:
Lennart Poettering 2009-08-14 20:03:30 +02:00
parent 72d2540e8d
commit 0f2a4ed422
2 changed files with 40 additions and 1 deletions
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5
src/pulse/volume.c
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@ -205,9 +205,12 @@ pa_volume_t pa_sw_volume_from_linear(double v) {
*
* http://www.robotplanet.dk/audio/audio_gui_design/
* http://lists.linuxaudio.org/pipermail/linux-audio-dev/2009-May/thread.html#23151
*
* We make sure that the conversion to linear and back yields the
* same volume value! That's why we need the lround() below!
*/
return (pa_volume_t) (cbrt(v) * PA_VOLUME_NORM);
return (pa_volume_t) lround(cbrt(v) * PA_VOLUME_NORM);
}
double pa_sw_volume_to_linear(pa_volume_t v) {