OpenFrameworks record audio example

ofApp.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){	 
	
	ofSetVerticalSync(true);
	
	soundStreamInput.printDeviceList();
	
	bufferSize = 256;
		
	soundStreamInput.setup(this, 0, 1, 44100, bufferSize, 4);
	soundStreamOutput.setup(this, 2, 0, 44100, bufferSize, 4);

	//if you want to set a different device id 
//	soundStreamInput.setDeviceID(2); //bear in mind the device id corresponds to all audio devices, including  input-only and output-only devices.	
//	soundStreamOutput.setDeviceID(2); //bear in mind the device id corresponds to all audio devices, including  input-only and output-only devices.

	playingBufferOffset = 0;
	recordingBufferOffset = 0;
	soundStreamOutput.stop();
	soundStreamInput.stop();
}

//--------------------------------------------------------------
void ofApp::update(){
	if(playingBufferOffset * bufferSize >= SAMPLE_LENGTH - bufferSize){
		isPlaying = false;
		soundStreamOutput.stop();
	}
	if(recordingBufferOffset * bufferSize >= SAMPLE_LENGTH - bufferSize){
		isRecording = false;
		soundStreamInput.stop();
	}
}

//--------------------------------------------------------------
void ofApp::draw(){
	
	ofSetColor(225);
	
	if(isPlaying){
		ofDrawBitmapString("PLAYING", 31, 92);
	}
	if(isRecording){
		ofDrawBitmapString("RECORDING", 31, 130);
	}
	
	string reportString = "recordBuffer: "+ofToString(recordingBufferOffset)+"\nplayBuffer: "+ofToString(playingBufferOffset);
	ofDrawBitmapString(reportString, 32, 200);
}

//--------------------------------------------------------------
void ofApp::audioIn(float * input, int bufferSize, int nChannels){
	if(isRecording){
		for (int i = 0; i < bufferSize; i++){
			recording[i+recordingBufferOffset*bufferSize] = input[i];
		}
		recordingBufferOffset++;
	}
}

void ofApp::audioOut(float * output, int bufferSize, int nChannels){
	if (isPlaying) {
		for (int i = 0; i < bufferSize; i++){
			output[ i*2+0 ] = recording[i + playingBufferOffset*bufferSize];
			output[ i*2+1 ] = recording[i + playingBufferOffset*bufferSize];
		}
		playingBufferOffset++;
	}
}

//--------------------------------------------------------------
void ofApp::keyPressed  (int key){ 
	if( key == 'r' ){
		if(isRecording) {
			isRecording = false;
			soundStreamInput.stop();
		}
		else{
			isRecording = true;
			soundStreamInput.start();
			recordingBufferOffset = 0;
		}
	}
	if( key == 'p' ){
		if(isPlaying) {
			isPlaying = false;
			soundStreamOutput.stop();
		}
		else{
			isPlaying = true;
			soundStreamOutput.start();
			playingBufferOffset = 0;
		}
	}
}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){ 
	
}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){
	
}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){
	
}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){
	
}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}

ofApp.h

#pragma once

#include "ofMain.h"

#define SAMPLE_LENGTH 441000  // ten seconds

class ofApp : public ofBaseApp{
	
	public:
		
		void setup();
		void update();
		void draw();
		
		void keyPressed(int key);
		void keyReleased(int key);
		void mouseMoved(int x, int y );
		void mouseDragged(int x, int y, int button);
		void mousePressed(int x, int y, int button);
		void mouseReleased(int x, int y, int button);
		void mouseEntered(int x, int y);
		void mouseExited(int x, int y);
		void windowResized(int w, int h);
		void dragEvent(ofDragInfo dragInfo);
		void gotMessage(ofMessage msg);
				
		void audioIn(float * input, int bufferSize, int nChannels); 
		void audioOut(float * output, int bufferSize, int nChannels);
	
	ofSoundStream soundStreamInput;
	ofSoundStream soundStreamOutput;
	
	float recording[SAMPLE_LENGTH];
	int recordingBufferOffset;
	int playingBufferOffset;
	
	bool isPlaying;
	bool isRecording;
	
	int bufferSize;
	
};