ce188d4d |
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 |
42 | extern "C" { |
43 | #endif |
44 | |
45 | typedef float flac_float_t; /* Type used for filtering */ |
46 | |
47 | extern flac_float_t ReplayGainReferenceLoudness; /* in dB SPL, currently == 89.0 */ |
48 | |
49 | int InitGainAnalysis ( long samplefreq ); |
50 | int ValidGainFrequency ( long samplefreq ); |
51 | int AnalyzeSamples ( const flac_float_t* left_samples, const flac_float_t* right_samples, size_t num_samples, int num_channels ); |
52 | flac_float_t GetTitleGain ( void ); |
53 | flac_float_t GetAlbumGain ( void ); |
54 | |
55 | #ifdef __cplusplus |
56 | } |
57 | #endif |
58 | |
59 | #endif /* GAIN_ANALYSIS_H */ |