AudioUnit Sample On cocos2d

#import <Foundation/Foundation.h>
#import "cocos2d.h"
#import <AudioUnit/AudioUnit.h>

@interface SoundBox : CCLayer {

    AudioUnit audioUnit;

    float phase;
    float samplingRate;
    float sineWaveFrequency;
    float fraquency;

}

+(id)soundBox;
-(id)initSoundBox;

-(void)start;
-(void)stop;

@property (nonatomic) float phase;
@property (nonatomic) float samplingRate;
@property (nonatomic) float sineWaveFrequency;
@property (nonatomic) float frequency;


@end

#import "SoundBox.h"

@implementation SoundBox

@synthesize phase;
@synthesize samplingRate;
@synthesize sineWaveFrequency;
@synthesize frequency;

+(id)soundBox
{
    return [[self alloc]initSoundBox];
}

-(id)initSoundBox
{
    if((self = [super init]))
    {
        self.samplingRate = 44100;
        self.sineWaveFrequency = 440;
        self.frequency = self.sineWaveFrequency * 2 * M_PI / self.samplingRate;

        [self prepareAudioUnit];
    }
    return self;
}

-(void)start
{
    AudioOutputUnitStart(audioUnit);
}

-(void)stop
{
    AudioOutputUnitStop(audioUnit);
}

OSStatus AURenderCallBack(void *inRefcon,
                        AudioUnitRenderActionFlags *ioActionFlags,
                        const AudioTimeStamp *inTimeStamp,
                        UInt32 inBusNumber,
                        UInt32 inNumberFrames,
                        AudioBufferList *ioData)
{
    SoundBox *soundBox = (__bridge SoundBox *)inRefcon;
    soundBox.frequency = soundBox.sineWaveFrequency * 2 * M_PI / soundBox.samplingRate;

    //float *outL = ioData->mBuffers[1].mData;
    float *outR = ioData->mBuffers[0].mData;

    for(int i = 0;i < (int)inNumberFrames;i++)
    {
        float wave = sin(soundBox.phase);
        //*outL++ = wave;
        *outR++ = wave;
        soundBox.phase += soundBox.frequency;
    }
    return noErr;
}


-(void)prepareAudioUnit
{
    AudioComponentDescription cd;
    cd.componentType = kAudioUnitType_Output;
    cd.componentSubType = kAudioUnitSubType_RemoteIO;
    cd.componentManufacturer = kAudioUnitManufacturer_Apple;
    cd.componentFlagsMask = 0;
    cd.componentFlags = 0;

    AudioComponent component = AudioComponentFindNext(NULL, &cd);
    AudioComponentInstanceNew(component, &audioUnit);
    AudioUnitInitialize(audioUnit);
    AURenderCallbackStruct callBackStruct;
    callBackStruct.inputProc = AURenderCallBack;
    callBackStruct.inputProcRefCon = (__bridge void*)self;
    AudioUnitSetProperty(audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callBackStruct, sizeof(callBackStruct));

    //AudioOutputUnitStart(audioUnit);

}


@end