diff src/OnsetDetectionFunction.h @ 38:b7e3ed593fb0

flow: Created branch 'release/v0.9.0'.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/OnsetDetectionFunction.h	Tue Jan 21 01:44:55 2014 +0000
@@ -0,0 +1,92 @@
+//=======================================================================
+/** @file OnsetDetectionFunction.h
+ *  @brief A class for calculating onset detection functions
+ *  @author Adam Stark
+ *  @copyright Copyright (C) 2008-2014  Queen Mary University of London
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+//=======================================================================
+
+#ifndef __RTONSETDF_H
+#define __RTONSETDF_H
+
+#include "fftw3.h"
+
+class OnsetDetectionFunction
+{
+public:
+	OnsetDetectionFunction();																// Constructor
+	OnsetDetectionFunction(int arg_hsize,int arg_fsize,int arg_df_type,int arg_win_type);	// Constructor (with arguments)
+	~OnsetDetectionFunction();																// Destructor
+	void initialise(int arg_hsize,int arg_fsize,int arg_df_type,int arg_win_type);			// Initialisation Function
+	
+	double getDFsample(double inputbuffer[]);												// process input buffer and calculate detection function sample
+	void set_df_type(int arg_df_type);														// set the detection function type
+	
+private:
+	
+	void perform_FFT();																		// perform the FFT on the data in 'frame'
+
+	double energy_envelope();																// calculate energy envelope detection function sample
+	double energy_difference();																// calculate energy difference detection function sample
+	double spectral_difference();															// calculate spectral difference detection function sample
+	double spectral_difference_hwr();														// calculate spectral difference (half wave rectified) detection function sample
+	double phase_deviation();																// calculate phase deviation detection function sample
+	double complex_spectral_difference();													// calculate complex spectral difference detection function sample
+	double complex_spectral_difference_hwr();												// calculate complex spectral difference detection function sample (half-wave rectified)
+	double high_frequency_content();														// calculate high frequency content detection function sample
+	double high_frequency_spectral_difference();											// calculate high frequency spectral difference detection function sample
+	double high_frequency_spectral_difference_hwr();										// calculate high frequency spectral difference detection function sample (half-wave rectified)
+
+	void set_win_rectangular();																// calculate a Rectangular window	
+	void set_win_hanning();																	// calculate a Hanning window
+	void set_win_hamming();																	// calculate a Hamming window
+	void set_win_blackman();																// calculate a Blackman window
+	void set_win_tukey();																	// calculate a Tukey window
+
+	
+	double princarg(double phaseval);														// set phase values between [-pi, pi]
+	
+	
+	double pi;																				// pi, the constant
+	
+	int framesize;																			// audio framesize
+	int hopsize;																			// audio hopsize	
+	int df_type;																			// type of detection function
+	
+	fftw_plan p;																			// create fft plan
+	fftw_complex *in;																		// to hold complex fft values for input
+	fftw_complex *out;																		// to hold complex fft values for output
+	
+	int initialised;																		// flag indicating whether buffers and FFT plans have been initialised
+	
+
+	double *frame;																			// audio frame
+	double *window;																			// window
+	double *wframe;																			// windowed frame
+	
+	double energy_sum_old;																	// to hold the previous energy sum value
+	
+	double *mag;																			// magnitude spectrum
+	double *mag_old;																		// previous magnitude spectrum
+	
+	double *phase;																			// FFT phase values
+	double *phase_old;																		// previous phase values
+	double *phase_old_2;																	// second order previous phase values
+
+};
+
+
+#endif
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