/* ReplayGainAnalysis - analyzes input samples and give the recommended dB change
* Copyright (C) 2001 David Robinson and Glen Sawyer
*
* 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/
*/
#pragma once
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#else
# ifdef HAVE_STDINT_H
# include <stdint.h>
# endif
#endif
typedef sample_t Float_t; /* Type used for filtering */
#define PINK_REF 64.82 /* 298640883795 */ /* calibration value for 89dB */
#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 48000L /* maximum allowed sample frequency [Hz] */
#define RMS_WINDOW_TIME_NUMERATOR 1L
#define RMS_WINDOW_TIME_DENOMINATOR 20L /* numerator / denominator = 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) */
enum { GAIN_NOT_ENOUGH_SAMPLES = -24601, GAIN_ANALYSIS_ERROR = 0, GAIN_ANALYSIS_OK =
1, INIT_GAIN_ANALYSIS_ERROR = 0, INIT_GAIN_ANALYSIS_OK = 1
};
enum { MAX_ORDER = (BUTTER_ORDER > YULE_ORDER ? BUTTER_ORDER : YULE_ORDER)
, MAX_SAMPLES_PER_WINDOW = ((MAX_SAMP_FREQ * RMS_WINDOW_TIME_NUMERATOR) / RMS_WINDOW_TIME_DENOMINATOR + 1) /* max. Samples per Time slice */
};
struct replaygain_data {
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;
double lsum;
double rsum;
int freqindex;
int first;
uint32_t A[STEPS_per_dB * MAX_dB];
uint32_t B[STEPS_per_dB * MAX_dB];
int InitGainAnalysis(long samplefreq);
int AnalyzeSamples(const Float_t * left_samples,
const Float_t * right_samples, size_t num_samples, int num_channels);
Float_t GetTitleGain();
};
#ifndef replaygain_data_defined
#define replaygain_data_defined
typedef struct replaygain_data replaygain_t;
#endif
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