/usr/include/replaygain/gain_analysis.h is in libreplaygain-dev 1.0~r475-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* 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/
*/
/**
* Pseudo-code to process an album:
*
* Float_t l_samples [4096];
* Float_t r_samples [4096];
* size_t num_samples;
* unsigned int num_songs;
* unsigned int i;
*
* gain_init_analysis ( 44100 );
* for ( i = 1; i <= num_songs; i++ ) {
* while ( ( num_samples = getSongSamples ( song[i], left_samples, right_samples ) ) > 0 )
* gain_analyze_samples ( left_samples, right_samples, num_samples, 2 );
* fprintf ("Recommended dB change for song %2d: %+6.2f dB\n", i, gain_get_title() );
* }
* fprintf ("Recommended dB change for whole album: %+6.2f dB\n", gain_get_album() );
*/
#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
/// Here's the deal : Call
int gain_init_analysis ( long samplefreq );
/// to initialize everything. Call
int gain_analyze_samples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels );
/// as many times as you want, with as many or as few samples as you want.
/// If mono, pass the sample buffer in through left_samples, leave
/// right_samples NULL, and make sure num_channels = 1.
Float_t gain_get_chapter ( void );
/// will return the recommended dB level change for all samples analyzed
/// SINCE THE LAST TIME you called gain_get_chapter() OR gain_init_analysis() OR gain_get_title.
Float_t gain_get_title ( void );
/// will return the recommended dB level change for all samples analyzed
/// SINCE THE LAST TIME you called gain_get_title() OR gain_init_analysis().
Float_t gain_get_album ( void );
/// will return the recommended dB level change for all samples analyzed
/// since gain_init_analysis() was called and finalized with gain_get_title().
#ifdef __cplusplus
}
#endif
#endif /* GAIN_ANALYSIS_H */
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