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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 (glensawyer@hotmail.com) 442 N 700 E, Provo, UT 84606 USA
* -- blame him if you think this runs too slowly, or the coding is otherwise flawed
* minor cosmetic tweaks to integrate with FLAC by Josh Coalson
*
* For an explanation of the concepts and the basic algorithms involved, go to:
* http://www.replaygain.org/
*/
#ifndef REPLAYGAIN_H_
#define REPLAYGAIN_H_
#include <stddef.h>
#define GAIN_NOT_ENOUGH_SAMPLES -24601
#define YULE_ORDER 10
#define BUTTER_ORDER 2
#define RMS_PERCENTILE 0.95 /* percentile which is louder than the proposed level */
#define MAX_SAMP_FREQ 48000. /* 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)
/* [JEC] the following was originally #defined as:
* (size_t) (MAX_SAMP_FREQ * RMS_WINDOW_TIME)
* but that seemed to fail to take into account the ceil() part of the
* sampleWindow calculation in ResetSampleFrequency(), and was causing
* buffer overflows for 48kHz analysis, hence the +1.
*/
#ifndef __sun
#define MAX_SAMPLES_PER_WINDOW (size_t) (MAX_SAMP_FREQ * RMS_WINDOW_TIME + 1.) /* max. Samples per Time slice */
#else
/* [JEC] Solaris Forte compiler doesn't like float calc in array indices */
#define MAX_SAMPLES_PER_WINDOW (size_t) (2401)
#endif
#define PINK_REF 64.82 /* 298640883795 */ /* calibration value */
typedef unsigned short Uint16_t;
typedef signed short Int16_t;
typedef unsigned int Uint32_t;
typedef signed int Int32_t;
class ReplayGain {
public:
ReplayGain ();
virtual ~ReplayGain();
bool initialise(long samplefreq, size_t channels);
bool process(const float* left_samples, const float* right_samples, size_t blockSize);
float end();
private:
void filterYule (const float* input, float* output, size_t nSamples);
void filterButter (const float* input, float* output, size_t nSamples);
bool ResetSampleFrequency ( long samplefreq );
float analyzeResult ( unsigned int* Array, size_t len );
int num_channels;
float linprebuf [MAX_ORDER * 2];
float* linpre; // left input samples, with pre-buffer
float lstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
float* lstep; // left "first step" (i.e. post first filter) samples
float loutbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
float* lout; // left "out" (i.e. post second filter) samples
float rinprebuf [MAX_ORDER * 2];
float* rinpre; // right input samples ...
float rstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
float* rstep;
float routbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
float* rout;
unsigned int sampleWindow; // number of samples required to reach number of milliseconds required for RMS window
unsigned long totsamp;
double lsum;
double rsum;
int freqindex;
#ifndef __sun
Uint32_t A [(size_t)(STEPS_per_dB * MAX_dB)];
/*static Uint32_t B [(size_t)(STEPS_per_dB * MAX_dB)];*/
#else
/* [JEC] Solaris Forte compiler doesn't like float calc in array indices */
Uint32_t A [12000];
/*static Uint32_t B [12000];*/
#endif
};
#endif /* REPLAYGAIN_H_ */
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