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#ifndef __SPECTRUM_H
#define __SPECTRUM_H
#include <stdint.h>
#include <time.h>
#include <sys/time.h>
#include <string>
#include <vector>
#include <immsconf.h>
#include <song.h>
using std::string;
using std::vector;
#define MINBPM 50
#define MAXBPM 250
#define WINDOWSIZE 512
#define OVERLAP 256
#define SAMPLERATE 22050
#define WINDOWSPSEC (SAMPLERATE/(WINDOWSIZE-OVERLAP))
#define MINBEATLENGTH (WINDOWSPSEC*60/MAXBPM)
#define MAXBEATLENGTH (WINDOWSPSEC*60/MINBPM)
#define BEATSSIZE (MAXBEATLENGTH-MINBEATLENGTH)
#define READSIZE (WINDOWSIZE - OVERLAP)
#define NFREQS (WINDOWSIZE / 2 + 1)
#define BARKSIZE (int)(26.81/(1+(2*1960.0/SAMPLERATE)) + 0.47)
#define SHORTSPECTRUM BARKSIZE
#define LONGSPECTRUM NFREQS
class BeatKeeper
{
public:
BeatKeeper() { reset(); }
void reset();
void dump(const string &filename);
string get_bpm_graph();
int guess_actual_bpm();
void integrate_beat(float power);
const BeatKeeper &operator +=(const BeatKeeper &other);
protected:
void process_window();
float check_peak(int i);
int maybe_double(int bpm, float min, float range);
int peak_finder_helper(vector<int> &peaks, int min, int max,
float cutoff, float range);
long unsigned int samples;
float average_with, *last_window, *current_window, *current_position;
float data[2*MAXBEATLENGTH];
float beats[BEATSSIZE];
};
class SpectrumAnalyzer
{
public:
SpectrumAnalyzer(const string &path);
~SpectrumAnalyzer() { finalize(); }
void integrate_spectrum(double long_spectrum[LONGSPECTRUM]);
void finalize();
bool is_known();
protected:
void reset();
private:
Song song;
BeatKeeper bpm_low, bpm_hi;
int have_spectrums;
float spectrum[SHORTSPECTRUM];
};
#endif
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