private int OnMusicDelivery(IntPtr sessionHandle, IntPtr audioFormatHandle, IntPtr frames, int numFrames)
{
if (numFrames == 0)
{
return(0);
}
if (frames == IntPtr.Zero)
{
return(0);
}
AudioFormat audioFormat = LibSpotify.AudioFormatFromHandle(audioFormatHandle);
int n = numFrames * FrameSize(audioFormat);
byte[] pcmData = new byte[n];
Marshal.Copy(frames, pcmData, 0, n);
EventDispatcher.Dispatch(this, sessionHandle, MusicDelivered,
new MusicDeliveryEventArgs(pcmData, audioFormat));
pcmData = null;
return(numFrames);
}