Generate sine wave data.

gistfile1.c

void sineWaveSamples( int num_of_samples, double *buffer) {

	double frequency    = 260;
	double sample_rate  = 8000;
	double increment    = 2.0 * M_PI * (frequency / sample_rate);
	double amplitude    = 0.25;
	
	static double theta = 0;
	
	for( UInt32 i = 0; i < num_of_samples; i++ ) {
		
		buffer[ i ]  = amplitude * sin( theta );
		theta        = fmod(increment + theta, 2.0 * M_PI);
	}
}