66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* Copyright (C) 2003-2010 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "replay_gain_info.h"
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#include <glib.h>
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#include <math.h>
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struct replay_gain_info *
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replay_gain_info_new(void)
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{
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struct replay_gain_info *ret = g_new(struct replay_gain_info, 1);
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for (unsigned i = 0; i < G_N_ELEMENTS(ret->tuples); ++i) {
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ret->tuples[i].gain = 0.0;
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ret->tuples[i].peak = 0.0;
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}
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return ret;
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}
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struct replay_gain_info *
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replay_gain_info_dup(const struct replay_gain_info *src)
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{
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return g_memdup(src, sizeof(*src));
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}
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void
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replay_gain_info_free(struct replay_gain_info *info)
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{
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g_free(info);
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}
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float
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replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp)
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{
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float scale;
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scale = pow(10.0, tuple->gain / 20.0);
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scale *= preamp;
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if (scale > 15.0)
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scale = 15.0;
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if (scale * tuple->peak > 1.0)
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scale = 1.0 / tuple->peak;
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return scale;
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}
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