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/*
* ReplayGainAnalysis - analyzes input samples and give the recommended dB change
* Copyright (C) 2001-2009 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>
#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
typedef double Float_t; // Type used for filtering
class cMarkAdAudioGainAnalysis
{
private:
typedef unsigned int Uint32_t;
typedef signed int Int32_t;
#define YULE_ORDER 10
#define BUTTER_ORDER 2
#define YULE_FILTER filterYule
#define BUTTER_FILTER filterButter
#define RMS_PERCENTILE 0.95 // percentile which is louder than the proposed level
#define MAX_SAMP_FREQ 96000. // maximum allowed sample frequency [Hz]
#define RMS_WINDOW_TIME 0.050 // Time slice size [s]
#define STEPS_per_dB 100. // Table entries per dB
#define MAX_dB 120. // Table entries for 0...MAX_dB (normal max. values are 70...80 dB)
#define MAX_ORDER (BUTTER_ORDER > YULE_ORDER ? BUTTER_ORDER : YULE_ORDER)
#define MAX_SAMPLES_PER_WINDOW (size_t) (MAX_SAMP_FREQ * RMS_WINDOW_TIME + 1) // max. Samples per Time slice
#define PINK_REF 64.82 //298640883795 // calibration value
Float_t linprebuf [MAX_ORDER * 2];
Float_t* linpre; // left input samples, with pre-buffer
Float_t lstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
Float_t* lstep; // left "first step" (i.e. post first filter) samples
Float_t loutbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
Float_t* lout; // left "out" (i.e. post second filter) samples
Float_t rinprebuf [MAX_ORDER * 2];
Float_t* rinpre; // right input samples ...
Float_t rstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
Float_t* rstep;
Float_t routbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
Float_t* rout;
long sampleWindow; // number of samples required to reach number of milliseconds required for RMS window
long totsamp;
int gnum_samples;
double lsum;
double rsum;
int freqindex;
int first;
Uint32_t A [(size_t)(STEPS_per_dB * MAX_dB)];
Uint32_t B [(size_t)(STEPS_per_dB * MAX_dB)];
static const Float_t ABButter[12][2*BUTTER_ORDER + 1];
static const Float_t ABYule[12][2*YULE_ORDER + 1];
void filterButter (const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel);
void filterYule (const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel);
int ResetSampleFrequency ( long samplefreq );
Float_t analyzeResult ( Uint32_t* Array, size_t len );
public:
int Init( long samplefreq );
int AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels );
int AnalyzedSamples()
{
return (int) gnum_samples;
};
Float_t GetGain(void);
};
#endif /* GAIN_ANALYSIS_H */
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