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# src/replay_gain_info.h

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    00001 /*
    00002  * Copyright (C) 2003-2010 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