cannam@86: /*
cannam@86:  *  ReplayGainAnalysis - analyzes input samples and give the recommended dB change
cannam@86:  *  Copyright (C) 2001 David Robinson and Glen Sawyer
cannam@86:  *
cannam@86:  *  This library is free software; you can redistribute it and/or
cannam@86:  *  modify it under the terms of the GNU Lesser General Public
cannam@86:  *  License as published by the Free Software Foundation; either
cannam@86:  *  version 2.1 of the License, or (at your option) any later version.
cannam@86:  *
cannam@86:  *  This library is distributed in the hope that it will be useful,
cannam@86:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@86:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
cannam@86:  *  Lesser General Public License for more details.
cannam@86:  *
cannam@86:  *  You should have received a copy of the GNU Lesser General Public
cannam@86:  *  License along with this library; if not, write to the Free Software
cannam@86:  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
cannam@86:  *
cannam@86:  *  concept and filter values by David Robinson (David@Robinson.org)
cannam@86:  *    -- blame him if you think the idea is flawed
cannam@86:  *  coding by Glen Sawyer (glensawyer@hotmail.com) 442 N 700 E, Provo, UT 84606 USA
cannam@86:  *    -- blame him if you think this runs too slowly, or the coding is otherwise flawed
cannam@86:  *  minor cosmetic tweaks to integrate with FLAC by Josh Coalson
cannam@86:  *
cannam@86:  *  For an explanation of the concepts and the basic algorithms involved, go to:
cannam@86:  *    http://www.replaygain.org/
cannam@86:  */
cannam@86: 
cannam@86: #ifndef GAIN_ANALYSIS_H
cannam@86: #define GAIN_ANALYSIS_H
cannam@86: 
cannam@86: #include <stddef.h>
cannam@86: 
cannam@86: #define GAIN_NOT_ENOUGH_SAMPLES  -24601
cannam@86: #define GAIN_ANALYSIS_ERROR           0
cannam@86: #define GAIN_ANALYSIS_OK              1
cannam@86: 
cannam@86: #define INIT_GAIN_ANALYSIS_ERROR      0
cannam@86: #define INIT_GAIN_ANALYSIS_OK         1
cannam@86: 
cannam@86: #ifdef __cplusplus
cannam@86: extern "C" {
cannam@86: #endif
cannam@86: 
cannam@86: typedef float   Float_t;         /* Type used for filtering */
cannam@86: 
cannam@86: extern Float_t ReplayGainReferenceLoudness; /* in dB SPL, currently == 89.0 */
cannam@86: 
cannam@86: int     InitGainAnalysis ( long samplefreq );
cannam@86: int     AnalyzeSamples   ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels );
cannam@86: int		ResetSampleFrequency ( long samplefreq );
cannam@86: Float_t GetTitleGain     ( void );
cannam@86: Float_t GetAlbumGain     ( void );
cannam@86: 
cannam@86: #ifdef __cplusplus
cannam@86: }
cannam@86: #endif
cannam@86: 
cannam@86: #endif /* GAIN_ANALYSIS_H */