andrew@16: /*
andrew@16:  *  AccompanimentSynchroniser.cpp
andrew@16:  *  MultipleAudioMathcher
andrew@16:  *
andrew@16:  *  Created by Andrew on 06/02/2012.
andrew@16:  *  Copyright 2012 QMUL. All rights reserved.
andrew@16:  *
andrew@16:  */
andrew@16: 
andrew@16: #include "AccompanimentSynchroniser.h"
andrew@16: 
andrew@16: AccompanimentSynchroniser::AccompanimentSynchroniser(){
andrew@16: 	sender.setup(HOST,  SENDER_PORT);
andrew@16: }
andrew@16: 
andrew@16: void AccompanimentSynchroniser::setPlayingRatio(const double& ratio, const double& timePlayed){
andrew@16: 	playingPositionRatio = ratio;
andrew@16: 	playingPositionSamples = ratio * fileLengthSamples;
andrew@16: 	playingPositionMillis = playingPositionSamples * 1000.0/44100.0;
andrew@16: 	playingPositionTimeSent = timePlayed;
andrew@16: }
andrew@16: 
andrew@16: 
andrew@16: void AccompanimentSynchroniser::updateRecordedPosition(const double& currentAlignmentPosition){
andrew@16: 	recordedPositionMillis = currentAlignmentPosition;
andrew@16: }
andrew@16: 
andrew@16: 
andrew@16: void AccompanimentSynchroniser::updateOutputSpeed(){
andrew@16: 	//we want the playing position to more closely align with the recordedPosition
andrew@16: 	
andrew@16: 	double difference = recordedPositionMillis - playingPositionMillis;
andrew@16: 	
andrew@16: 	//suppose we project that we will align in two seconds time
andrew@16: 	double projectedAlignmentTime = 2000;
andrew@16: 	
andrew@16: 	//then our current speed projects forward
andrew@16: 	double predictedPlayingTimeIncrease = projectedAlignmentTime*speed;
andrew@16: 	
andrew@16: 	difference += (projectedAlignmentTime - predictedPlayingTimeIncrease);
andrew@16: 	
andrew@16: 	speed += difference/projectedAlignmentTime;
andrew@16: 	
andrew@16: 	sendSpeed(speed);
andrew@16: 
andrew@16: }
andrew@16: 
andrew@16: void AccompanimentSynchroniser::sendSpeed(double const& val){
andrew@16: 	ofxOscMessage m;
andrew@16: 	m.setAddress( "/setSpeed" );
andrew@16: 	m.addFloatArg( val );
andrew@16: 	sender.sendMessage( m );
andrew@16: }