From 429f0b3d8b051fd992166fcfcd4a38e9aa763833 Mon Sep 17 00:00:00 2001 From: waker Date: Thu, 20 Aug 2009 20:46:48 +0200 Subject: fixed volume control --- volume.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 volume.c (limited to 'volume.c') diff --git a/volume.c b/volume.c new file mode 100644 index 00000000..85a9a125 --- /dev/null +++ b/volume.c @@ -0,0 +1,57 @@ +/* + DeaDBeeF - ultimate music player for GNU/Linux systems with X11 + Copyright (C) 2009 Alexey Yakovenko + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +*/ +#include +#include +#include "volume.h" + +static float volume_db = 0; // in dB +static float volume_amp = 1; // amplitude [0..1] + +void +volume_set_db (float dB) { + volume_db = dB; + volume_amp = dB > -60 ? db_to_amp (dB) : 0; +} + +float +volume_get_db (void) { + return volume_db; +} + +void +volume_set_amp (float amp) { + volume_amp = amp; + volume_db = amp > 0 ? amp_to_db (amp) : -60.f; +} + +float +volume_get_amp (void) { + return volume_amp; +} + +float +db_to_amp (float dB) { + return pow (10, dB/20.f); +} + +float +amp_to_db (float amp) { + return 20*log10 (amp); +} + -- cgit v1.2.3