Index: libreplaygain/include/gain_analysis.h
===================================================================
--- libreplaygain/include/gain_analysis.h	(revision 229)
+++ libreplaygain/include/gain_analysis.h	(revision 229)
@@ -0,0 +1,56 @@
+/*
+ *  ReplayGainAnalysis - analyzes input samples and give the recommended dB change
+ *  Copyright (C) 2001 David Robinson and Glen Sawyer
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  concept and filter values by David Robinson (David@Robinson.org)
+ *    -- blame him if you think the idea is flawed
+ *  coding by Glen Sawyer (mp3gain@hotmail.com) 735 W 255 N, Orem, UT 84057-4505 USA
+ *    -- blame him if you think this runs too slowly, or the coding is otherwise flawed
+ *
+ *  For an explanation of the concepts and the basic algorithms involved, go to:
+ *    http://www.replaygain.org/
+ */
+
+#ifndef GAIN_ANALYSIS_H
+#define GAIN_ANALYSIS_H
+
+#include <stddef.h>
+
+#define GAIN_NOT_ENOUGH_SAMPLES  -24601
+#define GAIN_ANALYSIS_ERROR           0
+#define GAIN_ANALYSIS_OK              1
+
+#define INIT_GAIN_ANALYSIS_ERROR      0
+#define INIT_GAIN_ANALYSIS_OK         1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef double  Float_t;         // Type used for filtering
+
+int     InitGainAnalysis ( long samplefreq );
+int     AnalyzeSamples   ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels );
+int	ResetSampleFrequency ( long samplefreq );
+Float_t   GetTitleGain     ( void );
+Float_t   GetAlbumGain     ( void );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GAIN_ANALYSIS_H */