Simple Audio and Accelerometer Callbacks that are creating artifacts.

ViewController.mm

#define SRATE 44100
#define FRAMESIZE 512
#define NUMCHANNELS 2
double g_t;
bool g_sineSwitch;
double g_freq;

@implementation hw1ViewController

void audioCallback(Float32 * buff, UInt32 frameSize, void * userData) {
    for (int i = 0; i < frameSize; i++) {  
        
        Float32 sample = sin( TWO_PI * g_freq * g_t++ / SRATE );
        
        for (int j = 0; j < NUMCHANNELS; j++) {
            buff[i*NUMCHANNELS+j] = 0.0;
            if (g_sineSwitch) {
                buff[i*NUMCHANNELS+j] = sample;
            }
        }
    }
}

void accelCallback(double x, double y, double z, void * data) {
    NSLog(@"x: %f", x);
    g_freq = 440.0 + x*100.0;
}


// ...

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    g_sineSwitch = false;
    g_t = 0.0;
    g_freq = 440.0;


    // start the accelerometer and multitouch callbacks
    MoAccel::setUpdateInterval(1.0);
    MoAccel::addCallback(accelCallback, NULL);

    NSLog(@"starting real-time audio...");
    
    // init the audio layer
    bool result = MoAudio::init(SRATE, FRAMESIZE, NUMCHANNELS);
    if (!result) {
        NSLog(@"cannot initialize real-time audio!");
        return;
    }

    // start the audio layer, registering a callback method
    result = MoAudio::start(audioCallback, (void*)&accelCallback);
    if (!result) {
        // something went wrong
        NSLog(@"cannot start real-time audio!");
        return;
    }


//    MoTouch::addCallback(touchCallback, NULL);
}

// ...

@end