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RomaNets Tutorial Programs

void StartStopSineWave(ref WaveOut w, float f, float a)
{
    if (w == null)
    {
        var sine = new SineWaveProvider32();
        sine.SetWaveFormat(32000, 1); // 32kHz mono
        sine.Frequency = f;
        sine.Amplitude = a;

        w = new WaveOut();
        w.Init(sine);
        w.Play();
    }
    else
    {
        w.Stop();
        w.Dispose();
        w = null;
    }
}

void StartStopSineWave_NoPlay(ref WaveOut w, float f, float a)
{
    if (w == null)
    {
        var sine = new SineWaveProvider32();
        sine.SetWaveFormat(32000, 1); // 32kHz mono
        sine.Frequency = f;
        sine.Amplitude = a;

        w = new WaveOut();
        w.DesiredLatency = 300;
        w.Init(sine);
        //w.Play();
    }
    else
    {
        w.Stop();
        w.Dispose();
        w = null;
    }
}
public class SineWaveProvider32 : WaveProvider32
{
    int sample;
    public SineWaveProvider32()
    {
        Frequency = 1000;
        Amplitude = 0.25f; // let's not hurt our ears
    }
    public float Frequency { get; set; }
    public float Amplitude { get; set; }
    public override int Read(float[] buffer, int offset, int sampleCount)
    {
        int sampleRate = WaveFormat.SampleRate;
        for (int n = 0; n < sampleCount; n++)
        {
            buffer[n + offset] = (float)(Amplitude * Math.Sin((2 * Math.PI * sample * Frequency) / sampleRate));
            sample++;
            if (sample >= sampleRate)
                sample = 0;
        }
        return sampleCount;
    }
}