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/*
* Copyright (C) 2003-2010 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 "config.h"
#include "replay_gain_info.h"
#include <glib.h>
#include <math.h>
struct replay_gain_info *
replay_gain_info_new(void)
{
struct replay_gain_info *ret = g_new(struct replay_gain_info, 1);
for (unsigned i = 0; i < G_N_ELEMENTS(ret->tuples); ++i) {
ret->tuples[i].gain = 0.0;
ret->tuples[i].peak = 0.0;
}
return ret;
}
struct replay_gain_info *
replay_gain_info_dup(const struct replay_gain_info *src)
{
return g_memdup(src, sizeof(*src));
}
void
replay_gain_info_free(struct replay_gain_info *info)
{
g_free(info);
}
float
replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp)
{
float scale;
scale = pow(10.0, tuple->gain / 20.0);
scale *= preamp;
if (scale > 15.0)
scale = 15.0;
if (scale * tuple->peak > 1.0)
scale = 1.0 / tuple->peak;
return scale;
}
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