1/*
2 *  ReplayGainAnalysis - analyzes input samples and give the recommended dB change
3 *  Copyright (C) 2001 David Robinson and Glen Sawyer
4 *
5 *  This library is free software; you can redistribute it and/or
6 *  modify it under the terms of the GNU Lesser General Public
7 *  License as published by the Free Software Foundation; either
8 *  version 2.1 of the License, or (at your option) any later version.
9 *
10 *  This library is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 *  Lesser General Public License for more details.
14 *
15 *  You should have received a copy of the GNU Lesser General Public
16 *  License along with this library; if not, write to the Free Software
17 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 *
19 *  concept and filter values by David Robinson (David@Robinson.org)
20 *    -- blame him if you think the idea is flawed
21 *  coding by Glen Sawyer (glensawyer@hotmail.com) 442 N 700 E, Provo, UT 84606 USA
22 *    -- blame him if you think this runs too slowly, or the coding is otherwise flawed
23 *  minor cosmetic tweaks to integrate with FLAC by Josh Coalson
24 *
25 *  For an explanation of the concepts and the basic algorithms involved, go to:
26 *    http://www.replaygain.org/
27 */
28
29#ifndef GAIN_ANALYSIS_H
30#define GAIN_ANALYSIS_H
31
32#include <stddef.h>
33
34#define GAIN_NOT_ENOUGH_SAMPLES  -24601
35#define GAIN_ANALYSIS_ERROR           0
36#define GAIN_ANALYSIS_OK              1
37
38#define INIT_GAIN_ANALYSIS_ERROR      0
39#define INIT_GAIN_ANALYSIS_OK         1
40
41#ifdef __cplusplus
42extern "C" {
43#endif
44
45typedef float   Float_t;         /* Type used for filtering */
46
47extern Float_t ReplayGainReferenceLoudness; /* in dB SPL, currently == 89.0 */
48
49int     InitGainAnalysis ( long samplefreq );
50int     AnalyzeSamples   ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels );
51int		ResetSampleFrequency ( long samplefreq );
52Float_t GetTitleGain     ( void );
53Float_t GetAlbumGain     ( void );
54
55#ifdef __cplusplus
56}
57#endif
58
59#endif /* GAIN_ANALYSIS_H */
60