// Open a new audio output stream
// Returns true when successful
public bool Open(uint samplingRate, uint bufferSize, OnNextProc onNext,
OnDoneProc onDone)
{
// Error checking
if (IsOpen() || samplingRate == 0 ||
onNext == null || onDone == null)
{
return(false);
}
// Configure the audio output stream for 16-bit stereo PCM
WAVEFORMATEX fmt;
fmt.wFormatTag = WAVE_FORMAT_PCM;
fmt.nChannels = 2;
fmt.nSamplesPerSec = samplingRate;
fmt.nBlockAlign = 4;
fmt.nAvgBytesPerSec = samplingRate * 4;
fmt.wBitsPerSample = 16;
fmt.cbSize = 0;
// Open the audio output stream
if (waveOutOpen(out WaveHandle, new IntPtr(WAVE_MAPPER), ref fmt,
Callback, IntPtr.Zero, CALLBACK_FUNCTION)
!= MMSYSERR_NOERROR)
{
return(false);
}
// Configure instance fields
OnDone = onDone;
OnNext = onNext;
State = Stopped;
// Configure buffers
uint frames = Math.Max(bufferSize, 1);
SamplesF = new float[frames * 2];
SamplesS = new short[frames * 2];
InitBuffer(ref Buffers[0], frames);
InitBuffer(ref Buffers[1], frames);
// No errors occurred, so return success
return(true);
}
// Open a new audio output stream, omitting the OnDone parameter
public bool Open(uint samplingRate, uint bufferSize, OnNextProc onNext)
{
return(Open(samplingRate, bufferSize, onNext, () => { }));
}
