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 St, 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 * 24 * For an explanation of the concepts and the basic algorithms involved, go to: 25 * http://www.replaygain.org/ 26 */ 27 28 #ifndef GAIN_ANALYSIS_H 29 #define GAIN_ANALYSIS_H 30 31 #include <stddef.h> 32 33 #define GAIN_NOT_ENOUGH_SAMPLES -24601 34 #define GAIN_ANALYSIS_ERROR 0 35 #define GAIN_ANALYSIS_OK 1 36 37 #define INIT_GAIN_ANALYSIS_ERROR 0 38 #define INIT_GAIN_ANALYSIS_OK 1 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 typedef double Float_t; // Type used for filtering 45 46 int InitGainAnalysis ( long samplefreq ); 47 int AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels ); 48 int ResetSampleFrequency ( long samplefreq ); 49 Float_t GetTitleGain ( void ); 50 Float_t GetAlbumGain ( void ); 51 52 #ifdef __cplusplus 53 } 54 #endif 55 56 #endif /* GAIN_ANALYSIS_H */ 57