http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/pulse/volume.c?id=ef01baf613b5f2cedd1a64b883a79d93965dc219
http:// cgit.freedeskto p.org/pulseaudi o/pulseaudio/ commit/ src/pulse/ volume. c?id=ef01baf613 b5f2cedd1a64b88 3a79d93965dc219