view src/AudioAnalysis.cpp @ 1:ba2a17cf81bf

first working version of audio file loder. Loads bach clip from the apps->audio-file-loader->bin->data->sounds foler. Three classes: SoundFileLoader does the loading and parsing of thefile with libSndFile. audio samples are kept in AudioFile and analysis of features are kept in AudioAnalysis, at this stage just chromagramm and basic energy

/*
 *  AudioAnalysis.cpp
 *  audioFileLoader4
 *
 *  Created by Andrew on 14/08/2011.
 *  Copyright 2011 QMUL. All rights reserved.
 *
 */

#include "AudioAnalysis.h"


AudioAnalysis::AudioAnalysis(){
	chromoGramm.initialise(FRAMESIZE,2048);

	scrollWidth = 1600;
	
}



void AudioAnalysis::drawEnergyVectorFromPointer(){
	DoubleVector* energyVec;
	energyVec = &energyVector;
	//xxx above
	
	ofSetColor(0xFF0066);
	float screenHeight = ofGetHeight() ;
	float screenWidth = ofGetWidth();  
	float heightFactor = 8;
	int i, j, startingFrame;
	startingFrame = currentPlayingFrame / scrollWidth;//i.e. number of scroll widths in
	startingFrame *= scrollWidth;
	
	for (i = 0; i < scrollWidth - 1; i++){
		j = i + startingFrame;
		if (j < (*energyVec).size())
			ofLine(i*screenWidth/scrollWidth, screenHeight - ((*energyVec)[j]*screenHeight/heightFactor),
				   screenWidth*(i+1)/scrollWidth, screenHeight - ((*energyVec)[j+1]*screenHeight/heightFactor));
		
	}
}

void AudioAnalysis::drawSpectralDifference(){
	DoubleMatrix* dMatrix;
	dMatrix = &chromaMatrix;
	//get rid of these!
	
	int matrixSize = (*dMatrix).size();
	if (matrixSize > 0){
		
		float screenHeight = ofGetHeight() ;
		float screenWidth = ofGetWidth();
		float heightFactor = 8;
		double difference;
		int i, j, startingFrame;
		startingFrame = currentPlayingFrame / scrollWidth;//i.e. number of scroll widths in
		startingFrame *= scrollWidth;//starting frame in terms of energy frames
		startingFrame /= CHROMA_CONVERSION_FACTOR; //in terms of chroma frames
		
		float chromoLength = scrollWidth/CHROMA_CONVERSION_FACTOR;
		for (i = 1; i < chromoLength; i++){//changed to add 1
			j = i + startingFrame;
			for (int y = 0;y < 12;y++){			
				
				if (j < matrixSize)
					difference = (*dMatrix)[j][11-y] - (*dMatrix)[j-1][11-y];
				else 
					difference = 0;
				
				if (difference < 0)
					difference = 0;//half wave rectify
				
				ofSetColor(0,0,255 * difference);//, 0;
				ofRect(i*screenWidth/chromoLength,y*screenHeight/12,screenWidth/chromoLength,screenHeight/12);
			}//end y
		}//end i
		
	}///end if matrix has content
	else{
		printf("Error - please load audio first");
	}
	
}


/*
void testApp::initialiseVariables(){
	
	energyIndex = 0;
	//	frameIndex = 0;
	chromaIndex = 0;
	chromoGramm.initialise(FRAMESIZE,2048);//framesize 512 and hopsize 2048
}


//--------------------------------------------------------------
void testApp::draw(){
	switch (screenToDraw){
		case 0:
			if (drawSpectralDifferenceFunction)
				drawSpectralDifference(&chromaMatrix);
			else
				drawDoubleMatrix(&chromaMatrix);
			
			drawEnergyVectorFromPointer(&firstEnergyVector);
			break;
		case 1:
			//	audioHolder.drawAudioVectorMillis(1000, 1000+audioScale);
			audioHolder.drawAudioVectorSamples(audioHolder.playPosition, audioHolder.playPosition+audioHolder.audioScaleSamples);
			break;
	}
	
	
	
	//ofSetColor(255,0,0);
	//drawEnergyVectorFromPointer(&audioVector);
	
	ofSetColor(0xFFFFFF);
	ofLine(audioPosition*width, 0, audioPosition*width, height);
	
	ofDrawBitmapString(soundFileName,80,480);
	
}


void testApp::drawEnergyVectorFromPointer(DoubleVector* energyVec){
	
	ofSetColor(0xFF0066);
	float screenHeight = ofGetHeight() ;
	float screenWidth = ofGetWidth();  
	float heightFactor = 8;
	int i, j, startingFrame;
	startingFrame = currentPlayingFrame / scrollWidth;//i.e. number of scroll widths in
	startingFrame *= scrollWidth;
	
	for (i = 0; i < scrollWidth - 1; i++){
		j = i + startingFrame;
		if (j < (*energyVec).size())
			ofLine(i*screenWidth/scrollWidth, screenHeight - ((*energyVec)[j]*screenHeight/heightFactor),
				   screenWidth*(i+1)/scrollWidth, screenHeight - ((*energyVec)[j+1]*screenHeight/heightFactor));
		
	}
}

void testApp::drawSpectralDifference(DoubleMatrix* dMatrix){
	int matrixSize = (*dMatrix).size();
	if (matrixSize > 0){
		
		float screenHeight = ofGetHeight() ;
		float screenWidth = ofGetWidth();
		float heightFactor = 8;
		double difference;
		int i, j, startingFrame;
		startingFrame = currentPlayingFrame / scrollWidth;//i.e. number of scroll widths in
		startingFrame *= scrollWidth;//starting frame in terms of energy frames
		startingFrame /= CHROMA_CONVERSION_FACTOR; //in terms of chroma frames
		
		float chromoLength = scrollWidth/CHROMA_CONVERSION_FACTOR;
		for (i = 1; i < chromoLength; i++){//changed to add 1
			j = i + startingFrame;
			for (int y = 0;y < 12;y++){			
				
				if (j < matrixSize)
					difference = (*dMatrix)[j][11-y] - (*dMatrix)[j-1][11-y];
				else 
					difference = 0;
				
				if (difference < 0)
					difference = 0;//half wave rectify
				
				ofSetColor(0,0,255 * difference);//, 0;
				ofRect(i*screenWidth/chromoLength,y*screenHeight/12,screenWidth/chromoLength,screenHeight/12);
			}//end y
		}//end i
		
	}///end if matrix has content
	else{
		printf("Error - please load audio first");
	}
	
}


void testApp::drawDoubleMatrix(DoubleMatrix* dMatrix){
	//used to draw the chromagram matrix
	int matrixSize = (*dMatrix).size();
	if (matrixSize > 0){
		
		float screenHeight = ofGetHeight() ;
		float screenWidth = ofGetWidth();
		float heightFactor = 8;
		int i, j, startingFrame;
		startingFrame = currentPlayingFrame / scrollWidth;//i.e. number of scroll widths in
		startingFrame *= scrollWidth;//starting frame in terms of energy frames
		startingFrame /= CHROMA_CONVERSION_FACTOR; //in terms of chroma frames
		
		float chromoLength = scrollWidth/CHROMA_CONVERSION_FACTOR;
		for (i = 0; i < chromoLength; i++){
			j = i + startingFrame;
			for (int y = 0;y < 12;y++){
				
				if (j < matrixSize)
					ofSetColor(0,0,255 * (*dMatrix)[j][11-y]);
				else 
					ofSetColor(0,0,0);
				
				ofRect(i*screenWidth/chromoLength,y*screenHeight/12,screenWidth/chromoLength,screenHeight/12);
			}//end y
		}//end i
		
	}///end if matrix has content
	else{
		printf("Error - please load audio first");
	}
	
	
}





*/