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/*
DeaDBeeF - ultimate music player for GNU/Linux systems with X11
Copyright (C) 2009-2011 Alexey Yakovenko <waker@users.sourceforge.net>
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 <math.h>
#include <stdio.h>
#include "volume.h"
#include "conf.h"
#define VOLUME_MIN (-50.f)
static float volume_db = 0; // in dB
static float volume_amp = 1; // amplitude [0..1]
void
volume_set_db (float dB) {
if (dB < VOLUME_MIN) {
dB = VOLUME_MIN;
}
if (dB > 0) {
dB = 0;
}
conf_set_float ("playback.volume", dB);
volume_db = dB;
volume_amp = dB > VOLUME_MIN ? db_to_amp (dB) : 0;
}
float
volume_get_db (void) {
return volume_db;
}
void
volume_set_amp (float amp) {
if (amp < 0) {
amp = 0;
}
if (amp > 1) {
amp = 1;
}
volume_amp = amp;
volume_db = amp > 0 ? amp_to_db (amp) : VOLUME_MIN;
conf_set_float ("playback.volume", volume_db);
}
float
volume_get_amp (void) {
return volume_amp;
}
float
db_to_amp (float dB) {
// return pow (10, dB/20.f);
// thanks to he for this hack
const float ln10=2.3025850929940002f;
return exp(ln10*dB/20.f);
}
float
amp_to_db (float amp) {
return 20*log10 (amp);
}
float
volume_get_min_db (void) {
return VOLUME_MIN;
}
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