MPD 0.17~git
src/replay_gain_info.h
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00001 /*
00002  * Copyright (C) 2003-2011 The Music Player Daemon Project
00003  * http://www.musicpd.org
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License as published by
00007  * the Free Software Foundation; either version 2 of the License, or
00008  * (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License along
00016  * with this program; if not, write to the Free Software Foundation, Inc.,
00017  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00018  */
00019 
00020 #ifndef MPD_REPLAY_GAIN_INFO_H
00021 #define MPD_REPLAY_GAIN_INFO_H
00022 
00023 #include "check.h"
00024 
00025 #include <stdbool.h>
00026 #include <math.h>
00027 
00028 enum replay_gain_mode {
00029         REPLAY_GAIN_AUTO = -2,
00030         REPLAY_GAIN_OFF,
00031         REPLAY_GAIN_ALBUM,
00032         REPLAY_GAIN_TRACK,
00033 };
00034 
00035 struct replay_gain_tuple {
00036         float gain;
00037         float peak;
00038 };
00039 
00040 struct replay_gain_info {
00041         struct replay_gain_tuple tuples[2];
00042 };
00043 
00044 static inline void
00045 replay_gain_tuple_init(struct replay_gain_tuple *tuple)
00046 {
00047         tuple->gain = INFINITY;
00048         tuple->peak = 0.0;
00049 }
00050 
00051 static inline void
00052 replay_gain_info_init(struct replay_gain_info *info)
00053 {
00054         replay_gain_tuple_init(&info->tuples[REPLAY_GAIN_ALBUM]);
00055         replay_gain_tuple_init(&info->tuples[REPLAY_GAIN_TRACK]);
00056 }
00057 
00058 static inline bool
00059 replay_gain_tuple_defined(const struct replay_gain_tuple *tuple)
00060 {
00061         return !isinf(tuple->gain);
00062 }
00063 
00064 float
00065 replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp, float missing_preamp, bool peak_limit);
00066 
00071 void
00072 replay_gain_info_complete(struct replay_gain_info *info);
00073 
00074 #endif