/// <summary>
/// Constructs a new Audio Output Device.
/// </summary>
///
/// <param name="device">Global identifier of the audio output device.</param>
/// <param name="owner">The owner window handle.</param>
/// <param name="samplingRate">The sampling rate of the device.</param>
/// <param name="channels">The number of channels of the device.</param>
///
public AudioOutputDevice(Guid device, IntPtr owner, int samplingRate, int channels)
{
this.owner = owner;
this.samplingRate = samplingRate;
this.channels = channels;
this.device = device;
DirectSound ds = new DirectSound(device);
ds.SetCooperativeLevel(owner, CooperativeLevel.Priority);
// Set the output format
WaveFormat waveFormat = WaveFormat.CreateIeeeFloatWaveFormat(samplingRate, channels);
bufferSize = 8 * waveFormat.AverageBytesPerSecond;
// Setup the secondary buffer
SoundBufferDescription desc2 = new SoundBufferDescription();
desc2.Flags =
BufferFlags.GlobalFocus |
BufferFlags.ControlPositionNotify |
BufferFlags.GetCurrentPosition2;
desc2.BufferBytes = bufferSize;
desc2.Format = waveFormat;
buffer = new SecondarySoundBuffer(ds, desc2);
var list = new List<NotificationPosition>();
int numberOfPositions = 32;
// Set notification for buffer percentiles
for (int i = 0; i < numberOfPositions; i++)
{
list.Add(new NotificationPosition()
{
WaitHandle = new AutoResetEvent(false),
Offset = i * bufferSize / numberOfPositions + 1,
});
}
// Set notification for end of buffer
list.Add(new NotificationPosition()
{
Offset = bufferSize - 1,
WaitHandle = new AutoResetEvent(false)
});
firstHalfBufferIndex = numberOfPositions / 2;
secondHalfBufferIndex = numberOfPositions;
notifications = list.ToArray();
System.Diagnostics.Debug.Assert(notifications[firstHalfBufferIndex].Offset == bufferSize / 2 + 1);
System.Diagnostics.Debug.Assert(notifications[secondHalfBufferIndex].Offset == bufferSize - 1);
// Make a copy of the wait handles
waitHandles = new WaitHandle[notifications.Length];
for (int i = 0; i < notifications.Length; i++)
waitHandles[i] = notifications[i].WaitHandle;
// Store all notification positions
buffer.SetNotificationPositions(notifications);
}
public DXWavePlayer(int device, int BufferByteSize, DataRequestDelegate fillProc)
{
if (BufferByteSize < 1000)
{
throw new ArgumentOutOfRangeException("BufferByteSize", "minimal size of buffer is 1000 bytes");
}
_buffersize = BufferByteSize;
_requestproc = fillProc;
var devices = DirectSound.GetDevices();
if (device <= 0 || device >= devices.Count)
{
device = 0;
}
_outputDevice = new DirectSound(devices[device].DriverGuid);
System.Windows.Interop.WindowInteropHelper wh = new System.Windows.Interop.WindowInteropHelper(Application.Current.MainWindow);
_outputDevice.SetCooperativeLevel(wh.Handle, CooperativeLevel.Priority);
_buffDescription = new SoundBufferDescription();
_buffDescription.Flags = BufferFlags.ControlPositionNotify | BufferFlags.ControlFrequency | BufferFlags.ControlEffects | BufferFlags.GlobalFocus | BufferFlags.GetCurrentPosition2;
_buffDescription.BufferBytes = BufferByteSize * InternalBufferSizeMultiplier;
WaveFormat format = new WaveFormat(16000, 16, 1);
_buffDescription.Format = format;
_soundBuffer = new SecondarySoundBuffer(_outputDevice, _buffDescription);
_synchronizer = new AutoResetEvent(false);
NotificationPosition[] nots = new NotificationPosition[InternalBufferSizeMultiplier];
NotificationPosition not;
int bytepos = 800;
for (int i = 0; i < InternalBufferSizeMultiplier; i++)
{
not = new NotificationPosition();
not.Offset = bytepos;
not.WaitHandle = _synchronizer;
nots[i] = not;
bytepos += BufferByteSize;
}
_soundBuffer.SetNotificationPositions(nots);
_waitThread = new Thread(new ThreadStart(DataRequestThread)) { Name = "MyWavePlayer.DataRequestThread" };
_waitThread.Start();
}
