adamstark@5: //=======================================================================
adamstark@5: /** @file OnsetDetectionFunction.h
adamstark@5:  *  @brief A class for calculating onset detection functions
adamstark@5:  *  @author Adam Stark
adamstark@5:  *  @copyright Copyright (C) 2008-2014  Queen Mary University of London
adamstark@5:  *
adamstark@5:  * This program is free software: you can redistribute it and/or modify
adamstark@5:  * it under the terms of the GNU General Public License as published by
adamstark@5:  * the Free Software Foundation, either version 3 of the License, or
adamstark@5:  * (at your option) any later version.
adamstark@5:  *
adamstark@5:  * This program is distributed in the hope that it will be useful,
adamstark@5:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
adamstark@5:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
adamstark@5:  * GNU General Public License for more details.
adamstark@5:  *
adamstark@5:  * You should have received a copy of the GNU General Public License
adamstark@5:  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
adamstark@5:  */
adamstark@5: //=======================================================================
adamstark@5: 
adamstark@22: #ifndef __ONSETDETECTIONFUNCTION_H
adamstark@22: #define __ONSETDETECTIONFUNCTION_H
adamstark@5: 
adamstark@5: #include "fftw3.h"
adamstark@5: 
adamstark@20: //=======================================================================
adamstark@23: /** The type of onset detection function to calculate */
adamstark@20: enum OnsetDetectionFunctionType
adamstark@20: {
adamstark@20:     EnergyEnvelope,
adamstark@20:     EnergyDifference,
adamstark@20:     SpectralDifference,
adamstark@20:     SpectralDifferenceHWR,
adamstark@20:     PhaseDeviation,
adamstark@20:     ComplexSpectralDifference,
adamstark@20:     ComplexSpectralDifferenceHWR,
adamstark@20:     HighFrequencyContent,
adamstark@20:     HighFrequencySpectralDifference,
adamstark@20:     HighFrequencySpectralDifferenceHWR
adamstark@20: };
adamstark@20: 
adamstark@20: //=======================================================================
adamstark@23: /** The type of window to use when calculating onset detection function samples */
adamstark@20: enum WindowType
adamstark@20: {
adamstark@20:     RectangularWindow,
adamstark@20:     HanningWindow,
adamstark@20:     HammingWindow,
adamstark@20:     BlackmanWindow,
adamstark@20:     TukeyWindow
adamstark@20: };
adamstark@20: 
adamstark@24: //=======================================================================
adamstark@24: /** A class for calculating onset detection functions. */
adamstark@5: class OnsetDetectionFunction
adamstark@5: {
adamstark@5: public:
adamstark@15:     
adamstark@23:     /** Constructor 
adamstark@23:      * @param hopSize_ the hop size in audio samples
adamstark@23:      * @param frameSize_ the frame size in audio samples
adamstark@23:      * @param onsetDetectionFunctionType_ the type of onset detection function to use - (see OnsetDetectionFunctionType)
adamstark@23:      * @param windowType the type of window to use (see WindowType)
adamstark@23:      */
adamstark@22: 	OnsetDetectionFunction(int hopSize_,int frameSize_,int onsetDetectionFunctionType_,int windowType);
adamstark@15:     
adamstark@15:     /** Destructor */
adamstark@15: 	~OnsetDetectionFunction();
adamstark@15:     
adamstark@23:     /** Initialisation Function 
adamstark@23:      * @param hopSize_ the hop size in audio samples
adamstark@23:      * @param frameSize_ the frame size in audio samples
adamstark@23:      * @param onsetDetectionFunctionType_ the type of onset detection function to use - (see OnsetDetectionFunctionType)
adamstark@23:      * @param windowType the type of window to use (see WindowType)
adamstark@23:      */
adamstark@22: 	void initialise(int hopSize_,int frameSize_,int onsetDetectionFunctionType_,int windowType);
adamstark@5: 	
adamstark@23:     /** Process input frame and calculate detection function sample 
adamstark@23:      * @param buffer a pointer to an array containing the audio samples to be processed
adamstark@23:      * @returns the onset detection function sample
adamstark@23:      */
adamstark@22: 	double calculateOnsetDetectionFunctionSample(double *buffer);
adamstark@15:     
adamstark@23:     /** Set the detection function type 
adamstark@23:      * @param onsetDetectionFunctionType_ the type of onset detection function to use - (see OnsetDetectionFunctionType)
adamstark@23:      */
adamstark@22: 	void setOnsetDetectionFunctionType(int onsetDetectionFunctionType_);
adamstark@5: 	
adamstark@5: private:
adamstark@5: 	
adamstark@23:     /** Perform the FFT on the data in 'frame' */
adamstark@22: 	void performFFT();
adamstark@5: 
adamstark@22:     //=======================================================================
adamstark@23:     /** Calculate energy envelope detection function sample */
adamstark@22: 	double energyEnvelope();
adamstark@15:     
adamstark@23:     /** Calculate energy difference detection function sample */
adamstark@22: 	double energyDifference();
adamstark@15:     
adamstark@23:     /** Calculate spectral difference detection function sample */
adamstark@22: 	double spectralDifference();
adamstark@15:     
adamstark@23:     /** Calculate spectral difference (half wave rectified) detection function sample */
adamstark@22: 	double spectralDifferenceHWR();
adamstark@15:     
adamstark@23:     /** Calculate phase deviation detection function sample */
adamstark@22: 	double phaseDeviation();
adamstark@15:     
adamstark@23:     /** Calculate complex spectral difference detection function sample */
adamstark@22: 	double complexSpectralDifference();
adamstark@15:     
adamstark@23:     /** Calculate complex spectral difference detection function sample (half-wave rectified) */
adamstark@22: 	double complexSpectralDifferenceHWR();
adamstark@15:     
adamstark@23:     /** Calculate high frequency content detection function sample */
adamstark@22: 	double highFrequencyContent();
adamstark@15:     
adamstark@23:     /** Calculate high frequency spectral difference detection function sample */
adamstark@22: 	double highFrequencySpectralDifference();
adamstark@15:     
adamstark@23:     /** Calculate high frequency spectral difference detection function sample (half-wave rectified) */
adamstark@22: 	double highFrequencySpectralDifferenceHWR();
adamstark@5: 
adamstark@22:     //=======================================================================
adamstark@23:     /** Calculate a Rectangular window */
adamstark@22: 	void calculateRectangularWindow();
adamstark@15:     
adamstark@23:     /** Calculate a Hanning window */
adamstark@22: 	void calculateHanningWindow();
adamstark@15:     
adamstark@23:     /** Calculate a Hamming window */
adamstark@22: 	void calclulateHammingWindow();
adamstark@15:     
adamstark@23:     /** Calculate a Blackman window */
adamstark@22: 	void calculateBlackmanWindow();
adamstark@15:     
adamstark@23:     /** Calculate a Tukey window */
adamstark@22: 	void calculateTukeyWindow();
adamstark@5: 
adamstark@22:     //=======================================================================
adamstark@23: 	/** Set phase values between [-pi, pi] 
adamstark@23:      * @param phaseVal the phase value to process
adamstark@23:      * @returns the wrapped phase value
adamstark@23:      */
adamstark@22: 	double princarg(double phaseVal);
adamstark@5: 	
adamstark@5: 	
adamstark@15: 	double pi;							/**< pi, the constant */
adamstark@5: 	
adamstark@22: 	int frameSize;						/**< audio framesize */
adamstark@22: 	int hopSize;						/**< audio hopsize */
adamstark@22: 	int onsetDetectionFunctionType;		/**< type of detection function */
adamstark@5: 	
adamstark@22: 	fftw_plan p;						/**< fftw plan */
adamstark@22: 	fftw_complex *complexIn;			/**< to hold complex fft values for input */
adamstark@22: 	fftw_complex *complexOut;			/**< to hold complex fft values for output */
adamstark@5: 	
adamstark@15: 	int initialised;					/**< flag indicating whether buffers and FFT plans are initialised */
adamstark@15: 
adamstark@15: 	double *frame;						/**< audio frame */
adamstark@15: 	double *window;						/**< window */
adamstark@5: 	
adamstark@22: 	double prevEnergySum;				/**< to hold the previous energy sum value */
adamstark@5: 	
adamstark@22: 	double *magSpec;					/**< magnitude spectrum */
adamstark@22: 	double *prevMagSpec;                /**< previous magnitude spectrum */
adamstark@5: 	
adamstark@15: 	double *phase;						/**< FFT phase values */
adamstark@22: 	double *prevPhase;					/**< previous phase values */
adamstark@22: 	double *prevPhase2;                 /**< second order previous phase values */
adamstark@5: 
adamstark@5: };
adamstark@5: 
adamstark@5: 
adamstark@5: #endif