view src/AudioFile.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

/*
 *  audioFile.cpp
 *  audioFileLoader3
 *
 *  Created by Andrew on 31/07/2011.
 *  Copyright 2011 QMUL. All rights reserved.
 *
 */

#include "AudioFile.h"

const double samplingFrequency = 44100.0;

AudioFile::AudioFile(){
	audioScaleSamples = 44100.;
	playPosition = 0;
}

void AudioFile::drawAudioVectorMillis(double startTimeMillis, double endTimeMillis){
	
	double startTimeSamples = startTimeMillis * samplingFrequency / 1000.0;
	double endTimeSamples = endTimeMillis * samplingFrequency / 1000.0;
	double screenHeight = ofGetHeight() ;
	double screenWidth = ofGetWidth(); 
	
	ofSetColor(255,0,0);
	double numberOfSamples = endTimeSamples - startTimeSamples;
	double samplesPerPixel = numberOfSamples / screenWidth;
	string samplesString = "millis : sps ";
	samplesString += ofToString(samplesPerPixel, 2);
	samplesString += " , \n";
	
	int lastSampleIndex = (int) startTimeSamples;
	
	for (int i = 1;i < screenWidth;i++){// && startTimeSamples + samplesPerPixel * i < endTimeSamples;i += 1){
		int sampleIndex = (int) min((startTimeSamples + samplesPerPixel * i), (double) length-1);
			//if (sampleIndex < 0)
			//	sampleIndex = 0;
		ofLine(i-1, screenHeight - (1-audioVector[sampleIndex])*screenHeight/2.0 , i, screenHeight - (1-audioVector[lastSampleIndex])*screenHeight/2.0);
		samplesString += ofToString(audioVector[i])+"  , \n";
		lastSampleIndex = sampleIndex;
		
	}
	ofDrawBitmapString(samplesString, 20,20);	
	
}



void AudioFile::drawAudioVectorSamples(double startTimeSample, double endTimeSample){
	
	screenHeight = ofGetHeight() ;
	double screenWidth = ofGetWidth(); 
	
	ofSetColor(255,0,0);
	double numberOfSamples = endTimeSample - startTimeSample;
	double samplesPerPixel = numberOfSamples / screenWidth;
	
	double halfHeight = screenHeight/2;
	
	int lastSampleIndex = (int) startTimeSample;
	/*
	for (int i = 1;i < screenWidth;i++){// && startTimeSamples + samplesPerPixel * i < endTimeSamples;i += 1){
		int sampleIndex = (int) (startTimeSample + samplesPerPixel * i);
		ofLine(i-1, screenHeight - (1-audioVector[sampleIndex])*screenHeight/2.0 , i, screenHeight - (1-audioVector[lastSampleIndex])*screenHeight/2.0);
		lastSampleIndex = sampleIndex;
		
	}
	*/
	double firstXpos = halfHeight;
	double firstYpos = getPosition(startTimeSample);//screenHeight - ((1-audioVector[startTimeSample])*screenHeight/2.0);
	
	int stepSize = 1;//(int) samplesPerPixel); optimize !! XXX
	for (int sampleIndex = startTimeSample+1;sampleIndex < min(endTimeSample, (double) length);sampleIndex+= stepSize){

		double secondXpos = (sampleIndex - startTimeSample) * screenWidth/numberOfSamples;
		double secondYpos = getPosition(sampleIndex);//screenHeight - ((1-audioVector[sampleIndex])*screenHeight/2.0);
		ofLine(firstXpos, firstYpos, secondXpos, secondYpos);
		
			if (numberOfSamples < 100)
				ofCircle(secondXpos, secondYpos, 2);
		
		firstXpos = secondXpos;
		firstYpos = secondYpos;
		
		
	}

	string samplesString = "samples: sps " + ofToString(samplesPerPixel, 2);
	samplesString += ", number of smaplers " + ofToString(numberOfSamples, 2);
	samplesString += " , \n";
	
	
	//info string
	string textString;
	textString = ofToString(playPosition, 1);
	ofDrawBitmapString(textString, 20, 20);
	ofDrawBitmapString(samplesString, 20, 60);

	
	
	ofSetColor(0,0,255);
	ofLine(0, halfHeight, screenWidth, halfHeight);
	
}
/*
double testApp::getXposition(int index, int startTimeSampleIndex){
	if (index >= 0 && index < audioVector.size())
		return (index - startTimeSampleIndex) * screenWidth/numberOfSamples;
}
*/
double AudioFile::getPosition(int index){
	if (index >= 0 && index < audioVector.size())
	return screenHeight - ((1-audioVector[index])*screenHeight/2.0);
	else
		return 0;
}	


/*
void AudioFile::drawAudioVectorSamples(double startTimeSample, double endTimeSample){
	
	double screenHeight = ofGetHeight() ;
	double screenWidth = ofGetWidth(); 
	
	ofSetColor(255,0,0);
	double numberOfSamples = endTimeSample - startTimeSample;
	double samplesPerPixel = numberOfSamples / screenWidth;
	
	double halfHeight = screenHeight/2;
	
	string samplesString = "samples: sps " + ofToString(samplesPerPixel, 2);
	samplesString += ", number of smaplers " + ofToString(numberOfSamples, 2);
	samplesString += " , \n";
	
	int lastSampleIndex = (int) startTimeSample;
	
	for (int i = 1;i < screenWidth;i++){// && startTimeSamples + samplesPerPixel * i < endTimeSamples;i += 1){
		int sampleIndex = (int) (startTimeSample + samplesPerPixel * i);
		ofLine(i-1, screenHeight - (1-audioVector[sampleIndex])*screenHeight/2.0 , i, screenHeight - (1-audioVector[lastSampleIndex])*screenHeight/2.0);
		lastSampleIndex = sampleIndex;
		
	}
	//info string
	string textString;
	textString = ofToString(playPosition, 1);
	ofDrawBitmapString(textString, 20, 20);
	ofDrawBitmapString(samplesString, 20, 60);
	
	
	
	ofSetColor(0,0,255);
	ofLine(0, halfHeight, screenWidth, halfHeight);
	
}
 */