private static extern Wave.MMSYSERR waveInUnprepareHeader(IntPtr hwi, Wave.WAVEHDR pwh, uint cbwh);
private static extern Wave.MMSYSERR waveInAddBuffer(IntPtr hwi, Wave.WAVEHDR pwh, uint cbwh);
private static extern Wave.MMSYSERR waveInOpen(ref IntPtr phwi, uint uDeviceID, Wave.WAVEFORMATEX pwfx, IntPtr dwCallback, uint dwInstance, uint fdwOpen);