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