|
cannam@86
|
1 /*
|
|
cannam@86
|
2 * ReplayGainAnalysis - analyzes input samples and give the recommended dB change
|
|
cannam@86
|
3 * Copyright (C) 2001 David Robinson and Glen Sawyer
|
|
cannam@86
|
4 *
|
|
cannam@86
|
5 * This library is free software; you can redistribute it and/or
|
|
cannam@86
|
6 * modify it under the terms of the GNU Lesser General Public
|
|
cannam@86
|
7 * License as published by the Free Software Foundation; either
|
|
cannam@86
|
8 * version 2.1 of the License, or (at your option) any later version.
|
|
cannam@86
|
9 *
|
|
cannam@86
|
10 * This library is distributed in the hope that it will be useful,
|
|
cannam@86
|
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
cannam@86
|
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
cannam@86
|
13 * Lesser General Public License for more details.
|
|
cannam@86
|
14 *
|
|
cannam@86
|
15 * You should have received a copy of the GNU Lesser General Public
|
|
cannam@86
|
16 * License along with this library; if not, write to the Free Software
|
|
cannam@86
|
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
cannam@86
|
18 *
|
|
cannam@86
|
19 * concept and filter values by David Robinson (David@Robinson.org)
|
|
cannam@86
|
20 * -- blame him if you think the idea is flawed
|
|
cannam@86
|
21 * coding by Glen Sawyer (glensawyer@hotmail.com) 442 N 700 E, Provo, UT 84606 USA
|
|
cannam@86
|
22 * -- blame him if you think this runs too slowly, or the coding is otherwise flawed
|
|
cannam@86
|
23 * minor cosmetic tweaks to integrate with FLAC by Josh Coalson
|
|
cannam@86
|
24 *
|
|
cannam@86
|
25 * For an explanation of the concepts and the basic algorithms involved, go to:
|
|
cannam@86
|
26 * http://www.replaygain.org/
|
|
cannam@86
|
27 */
|
|
cannam@86
|
28
|
|
cannam@86
|
29 #ifndef GAIN_ANALYSIS_H
|
|
cannam@86
|
30 #define GAIN_ANALYSIS_H
|
|
cannam@86
|
31
|
|
cannam@86
|
32 #include <stddef.h>
|
|
cannam@86
|
33
|
|
cannam@86
|
34 #define GAIN_NOT_ENOUGH_SAMPLES -24601
|
|
cannam@86
|
35 #define GAIN_ANALYSIS_ERROR 0
|
|
cannam@86
|
36 #define GAIN_ANALYSIS_OK 1
|
|
cannam@86
|
37
|
|
cannam@86
|
38 #define INIT_GAIN_ANALYSIS_ERROR 0
|
|
cannam@86
|
39 #define INIT_GAIN_ANALYSIS_OK 1
|
|
cannam@86
|
40
|
|
cannam@86
|
41 #ifdef __cplusplus
|
|
cannam@86
|
42 extern "C" {
|
|
cannam@86
|
43 #endif
|
|
cannam@86
|
44
|
|
cannam@86
|
45 typedef float Float_t; /* Type used for filtering */
|
|
cannam@86
|
46
|
|
cannam@86
|
47 extern Float_t ReplayGainReferenceLoudness; /* in dB SPL, currently == 89.0 */
|
|
cannam@86
|
48
|
|
cannam@86
|
49 int InitGainAnalysis ( long samplefreq );
|
|
cannam@86
|
50 int AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels );
|
|
cannam@86
|
51 int ResetSampleFrequency ( long samplefreq );
|
|
cannam@86
|
52 Float_t GetTitleGain ( void );
|
|
cannam@86
|
53 Float_t GetAlbumGain ( void );
|
|
cannam@86
|
54
|
|
cannam@86
|
55 #ifdef __cplusplus
|
|
cannam@86
|
56 }
|
|
cannam@86
|
57 #endif
|
|
cannam@86
|
58
|
|
cannam@86
|
59 #endif /* GAIN_ANALYSIS_H */
|
