winamp/Src/ReplayGainAnalysis/gain_analysis.h

/*
*  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>
#include <bfc/platform/export.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 float Float_t;         // Type used for filtering

	DLLEXPORT void * WACreateRGContext();
	DLLEXPORT void WAFreeRGContext(void *context);

	int DLLEXPORT WAInitGainAnalysis(void *context, long samplefreq);
	int DLLEXPORT WAAnalyzeSamples(void *context, const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels);
	int	DLLEXPORT WAResetSampleFrequency ( void *context, long samplefreq );
	Float_t DLLEXPORT WAGetTitleGain(void *context);
	Float_t DLLEXPORT WAGetAlbumGain(void *context);

#ifdef __cplusplus
}
#endif

#endif /* GAIN_ANALYSIS_H */