60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
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/*
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* ReplayGainAnalysis - analyzes input samples and give the recommended dB change
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* Copyright (C) 2001 David Robinson and Glen Sawyer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* concept and filter values by David Robinson (David@Robinson.org)
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* -- blame him if you think the idea is flawed
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* coding by Glen Sawyer (glensawyer@hotmail.com) 442 N 700 E, Provo, UT 84606 USA
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* -- blame him if you think this runs too slowly, or the coding is otherwise flawed
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* minor cosmetic tweaks to integrate with FLAC by Josh Coalson
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*
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* For an explanation of the concepts and the basic algorithms involved, go to:
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* http://www.replaygain.org/
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*/
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#ifndef GAIN_ANALYSIS_H
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#define GAIN_ANALYSIS_H
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#include <stddef.h>
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#define GAIN_NOT_ENOUGH_SAMPLES -24601
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#define GAIN_ANALYSIS_ERROR 0
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#define GAIN_ANALYSIS_OK 1
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#define INIT_GAIN_ANALYSIS_ERROR 0
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#define INIT_GAIN_ANALYSIS_OK 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef float flac_float_t; /* Type used for filtering */
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extern flac_float_t ReplayGainReferenceLoudness; /* in dB SPL, currently == 89.0 */
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int InitGainAnalysis ( long samplefreq );
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int ValidGainFrequency ( long samplefreq );
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int AnalyzeSamples ( const flac_float_t* left_samples, const flac_float_t* right_samples, size_t num_samples, int num_channels );
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flac_float_t GetTitleGain ( void );
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flac_float_t GetAlbumGain ( void );
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#ifdef __cplusplus
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}
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#endif
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#endif /* GAIN_ANALYSIS_H */
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