annotate src/AccompanimentSynchroniser.cpp @ 16:680ba08e9925

Auto synchroniser added using the elastique~ object in max

/*
 *  AccompanimentSynchroniser.cpp
 *  MultipleAudioMathcher
 *
 *  Created by Andrew on 06/02/2012.
 *  Copyright 2012 QMUL. All rights reserved.
 *
 */

#include "AccompanimentSynchroniser.h"

AccompanimentSynchroniser::AccompanimentSynchroniser(){
	sender.setup(HOST,  SENDER_PORT);
}

void AccompanimentSynchroniser::setPlayingRatio(const double& ratio, const double& timePlayed){
	playingPositionRatio = ratio;
	playingPositionSamples = ratio * fileLengthSamples;
	playingPositionMillis = playingPositionSamples * 1000.0/44100.0;
	playingPositionTimeSent = timePlayed;
}


void AccompanimentSynchroniser::updateRecordedPosition(const double& currentAlignmentPosition){
	recordedPositionMillis = currentAlignmentPosition;
}


void AccompanimentSynchroniser::updateOutputSpeed(){
	//we want the playing position to more closely align with the recordedPosition
	
	double difference = recordedPositionMillis - playingPositionMillis;
	
	//suppose we project that we will align in two seconds time
	double projectedAlignmentTime = 2000;
	
	//then our current speed projects forward
	double predictedPlayingTimeIncrease = projectedAlignmentTime*speed;
	
	difference += (projectedAlignmentTime - predictedPlayingTimeIncrease);
	
	speed += difference/projectedAlignmentTime;
	
	sendSpeed(speed);

}

void AccompanimentSynchroniser::sendSpeed(double const& val){
	ofxOscMessage m;
	m.setAddress( "/setSpeed" );
	m.addFloatArg( val );
	sender.sendMessage( m );
}