From 0f2a4ed422530b56b3744efe8055540644c0e774 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Fri, 14 Aug 2009 20:03:30 +0200 Subject: volume: guarantee dB/linear conversion is reversible --- src/pulse/volume.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'src/pulse') diff --git a/src/pulse/volume.c b/src/pulse/volume.c index 42cde5b9..c23f360b 100644 --- a/src/pulse/volume.c +++ b/src/pulse/volume.c @@ -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) { -- cgit