andrew@0: /*
andrew@0:  *  OnsetDetectionFunction.h
andrew@0:  *  
andrew@0:  *
andrew@0:  *  Created by Adam Stark on 22/03/2011.
andrew@0:  *  Copyright 2011 Queen Mary University of London. All rights reserved.
andrew@0:  *
andrew@0:  */
andrew@0: 
andrew@0: #ifndef __RTONSETDF_H
andrew@0: #define __RTONSETDF_H
andrew@0: 
andrew@0: //#include "fftw3.h"
andrew@0: #include "accFFT.h"
andrew@0: 
andrew@0: typedef double fft_complex[2];
andrew@0: 
andrew@0: class OnsetDetectionFunction
andrew@0: {
andrew@0: public:
andrew@0: 	OnsetDetectionFunction();																// Constructor
andrew@0: 	OnsetDetectionFunction(int arg_hsize,int arg_fsize,int arg_df_type,int arg_win_type);	// Constructor (with arguments)
andrew@0: 	~OnsetDetectionFunction();																// Destructor
andrew@0: 	void initialise(int arg_hsize,int arg_fsize,int arg_df_type,int arg_win_type);			// Initialisation Function
Venetian@8: 
Venetian@8: 	double getDFsample(float inputbuffer[]);
andrew@0: 	double getDFsample(double inputbuffer[]);												// process input buffer and calculate detection function sample
andrew@0: 	void set_df_type(int arg_df_type);														// set the detection function type
andrew@0: 	
andrew@4: 	int framesize;																			// audio framesize
andrew@4: 	int hopsize;																			// audio hopsize
andrew@0: private:
andrew@0: 	
andrew@0: 	void perform_FFT();																		// perform the FFT on the data in 'frame'
andrew@0: 
andrew@0: 	double energy_envelope();																// calculate energy envelope detection function sample
andrew@0: 	double energy_difference();																// calculate energy difference detection function sample
andrew@0: 	double spectral_difference();															// calculate spectral difference detection function sample
andrew@0: 	double spectral_difference_hwr();														// calculate spectral difference (half wave rectified) detection function sample
andrew@0: 	double phase_deviation();																// calculate phase deviation detection function sample
andrew@0: 	double complex_spectral_difference();													// calculate complex spectral difference detection function sample
andrew@0: 	double complex_spectral_difference_hwr();												// calculate complex spectral difference detection function sample (half-wave rectified)
andrew@0: 	double high_frequency_content();														// calculate high frequency content detection function sample
andrew@0: 	double high_frequency_spectral_difference();											// calculate high frequency spectral difference detection function sample
andrew@0: 	double high_frequency_spectral_difference_hwr();										// calculate high frequency spectral difference detection function sample (half-wave rectified)
andrew@0: 
andrew@0: 	void set_win_rectangular();																// calculate a Rectangular window	
andrew@0: 	void set_win_hanning();																	// calculate a Hanning window
andrew@0: 	void set_win_hamming();																	// calculate a Hamming window
andrew@0: 	void set_win_blackman();																// calculate a Blackman window
andrew@0: 	void set_win_tukey();																	// calculate a Tukey window
andrew@0: 
andrew@0: 	
andrew@0: 	double princarg(double phaseval);														// set phase values between [-pi, pi]
andrew@0: 	
andrew@0: 	
andrew@0: 	double pi;																				// pi, the constant
andrew@4: 																				
andrew@0: 	int df_type;																			// type of detection function
andrew@0: 	
andrew@0:     accFFT *fft;
andrew@0:     fft_complex *out;
andrew@0:     double *in;
andrew@0:     
andrew@0: 	//fftw_plan p;																			// create fft plan
andrew@0: 	//fftw_complex *in;																		// to hold complex fft values for input
andrew@0: 	//fftw_complex *out;																		// to hold complex fft values for output
andrew@0:     
andrew@0: 	
andrew@0: 	int initialised;																		// flag indicating whether buffers and FFT plans have been initialised
andrew@0: 	
andrew@0: 
andrew@0: 	double *frame;																			// audio frame
andrew@0: 	double *window;																			// window
andrew@0: 	double *wframe;																			// windowed frame
andrew@0: 	
andrew@0: 	double energy_sum_old;																	// to hold the previous energy sum value
andrew@0: 	
andrew@0: 	double *mag;																			// magnitude spectrum
andrew@0: 	double *mag_old;																		// previous magnitude spectrum
andrew@0: 	
andrew@0: 	double *phase;																			// FFT phase values
andrew@0: 	double *phase_old;																		// previous phase values
andrew@0: 	double *phase_old_2;																	// second order previous phase values
andrew@0: 
andrew@0: };
andrew@0: 
andrew@0: 
andrew@0: #endif