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93 lines
3.8 KiB
C
93 lines
3.8 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) 2001-2009 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 (mp3gain@hotmail.com) 735 W 255 N, Orem, UT 84057-4505 USA
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* -- blame him if you think this runs too slowly, or the coding is otherwise flawed
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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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#include <stdint.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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#define STEPS_per_dB 100. // Table entries per dB
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#define MAX_dB 120. // Table entries for 0...MAX_dB (normal max. values are 70...80 dB)
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#define MAX_SAMP_FREQ 96000. // maximum allowed sample frequency [Hz]
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#define RMS_WINDOW_TIME 0.050 // Time slice size [s]
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#define YULE_ORDER 10
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#define BUTTER_ORDER 2
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#define MAX_ORDER (BUTTER_ORDER > YULE_ORDER ? BUTTER_ORDER : YULE_ORDER)
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#define MAX_SAMPLES_PER_WINDOW (size_t) (MAX_SAMP_FREQ * RMS_WINDOW_TIME + 1) // max. Samples per Time slice
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typedef float Float_t; // Type used for filtering
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struct GainAnalyzer
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{
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int InitGainAnalysis(int samplefreq);
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int AnalyzeSamples(const Float_t *left_samples, const Float_t *right_samples, size_t num_samples, int num_channels);
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int ResetSampleFrequency(int samplefreq);
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Float_t GetTitleGain(void);
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Float_t GetAlbumGain(void);
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private:
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Float_t linprebuf[MAX_ORDER * 2];
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Float_t *linpre; // left input samples, with pre-buffer
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Float_t lstepbuf[MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
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Float_t *lstep; // left "first step" (i.e. post first filter) samples
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Float_t loutbuf[MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
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Float_t *lout; // left "out" (i.e. post second filter) samples
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Float_t rinprebuf[MAX_ORDER * 2];
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Float_t *rinpre; // right input samples ...
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Float_t rstepbuf[MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
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Float_t *rstep;
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Float_t routbuf[MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
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Float_t *rout;
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long sampleWindow; // number of samples required to reach number of milliseconds required for RMS window
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long totsamp;
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double lsum;
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double rsum;
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int freqindex;
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unsigned int A[(size_t) (STEPS_per_dB * MAX_dB)];
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unsigned int B[(size_t) (STEPS_per_dB * MAX_dB)];
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void filterYule(const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel);
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void filterButter(const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel);
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Float_t analyzeResult(const unsigned int* Array, size_t len);
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};
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#endif /* GAIN_ANALYSIS_H */
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