private void InitializeDirectSound()
{
// Open DirectSound
lock (this.m_LockObject)
{
directSound = null;
DirectSoundCreate(ref device, out directSound, IntPtr.Zero);
if (directSound != null)
{
// Set Cooperative Level to PRIORITY (priority level can call the SetFormat and Compact methods)
directSound.SetCooperativeLevel(GetDesktopWindow(), DirectSoundCooperativeLevel.DSSCL_PRIORITY);
// -------------------------------------------------------------------------------------
// Create PrimaryBuffer
// -------------------------------------------------------------------------------------
// Fill BufferDescription for PrimaryBuffer
BufferDescription bufferDesc = new BufferDescription();
bufferDesc.dwSize = Marshal.SizeOf(bufferDesc);
bufferDesc.dwBufferBytes = 0;
bufferDesc.dwFlags = DirectSoundBufferCaps.DSBCAPS_PRIMARYBUFFER;
bufferDesc.dwReserved = 0;
bufferDesc.lpwfxFormat = IntPtr.Zero;
bufferDesc.guidAlgo = Guid.Empty;
object soundBufferObj;
// Create PrimaryBuffer
directSound.CreateSoundBuffer(bufferDesc, out soundBufferObj, IntPtr.Zero);
primarySoundBuffer = (IDirectSoundBuffer)soundBufferObj;
// Play & Loop on the PrimarySound Buffer
primarySoundBuffer.Play(0, 0, DirectSoundPlayFlags.DSBPLAY_LOOPING);
// -------------------------------------------------------------------------------------
// Create SecondaryBuffer
// -------------------------------------------------------------------------------------
// A frame of samples equals to Desired Latency
samplesFrameSize = MsToBytes(desiredLatency);
// Fill BufferDescription for SecondaryBuffer
BufferDescription bufferDesc2 = new BufferDescription();
bufferDesc2.dwSize = Marshal.SizeOf(bufferDesc2);
bufferDesc2.dwBufferBytes = (uint)(samplesFrameSize * 2);
bufferDesc2.dwFlags = DirectSoundBufferCaps.DSBCAPS_GETCURRENTPOSITION2
| DirectSoundBufferCaps.DSBCAPS_CTRLPOSITIONNOTIFY
| DirectSoundBufferCaps.DSBCAPS_GLOBALFOCUS
| DirectSoundBufferCaps.DSBCAPS_CTRLVOLUME
| DirectSoundBufferCaps.DSBCAPS_STICKYFOCUS
| DirectSoundBufferCaps.DSBCAPS_GETCURRENTPOSITION2;
bufferDesc2.dwReserved = 0;
GCHandle handleOnWaveFormat = GCHandle.Alloc(waveFormat, GCHandleType.Pinned); // Ptr to waveFormat
bufferDesc2.lpwfxFormat = handleOnWaveFormat.AddrOfPinnedObject(); // set Ptr to waveFormat
bufferDesc2.guidAlgo = Guid.Empty;
// Create SecondaryBuffer
directSound.CreateSoundBuffer(bufferDesc2, out soundBufferObj, IntPtr.Zero);
secondaryBuffer = (IDirectSoundBuffer)soundBufferObj;
handleOnWaveFormat.Free();
// Get effective SecondaryBuffer size
BufferCaps dsbCaps = new BufferCaps();
dsbCaps.dwSize = Marshal.SizeOf(dsbCaps);
secondaryBuffer.GetCaps(dsbCaps);
nextSamplesWriteIndex = 0;
samplesTotalSize = dsbCaps.dwBufferBytes;
samples = new byte[samplesTotalSize];
System.Diagnostics.Debug.Assert(samplesTotalSize == (2 * samplesFrameSize), "Invalid SamplesTotalSize vs SamplesFrameSize");
// -------------------------------------------------------------------------------------
// Create double buffering notification.
// Use DirectSoundNotify at Position [0, 1/2] and Stop Position (0xFFFFFFFF)
// -------------------------------------------------------------------------------------
IDirectSoundNotify notify = (IDirectSoundNotify)soundBufferObj;
frameEventWaitHandle1 = new EventWaitHandle(false, EventResetMode.AutoReset);
frameEventWaitHandle2 = new EventWaitHandle(false, EventResetMode.AutoReset);
endEventWaitHandle = new EventWaitHandle(false, EventResetMode.AutoReset);
DirectSoundBufferPositionNotify[] notifies = new DirectSoundBufferPositionNotify[3];
notifies[0] = new DirectSoundBufferPositionNotify();
notifies[0].dwOffset = 0;
notifies[0].hEventNotify = frameEventWaitHandle1.SafeWaitHandle.DangerousGetHandle();
notifies[1] = new DirectSoundBufferPositionNotify();
notifies[1].dwOffset = (uint)samplesFrameSize;
notifies[1].hEventNotify = frameEventWaitHandle2.SafeWaitHandle.DangerousGetHandle();
notifies[2] = new DirectSoundBufferPositionNotify();
notifies[2].dwOffset = 0xFFFFFFFF;
notifies[2].hEventNotify = endEventWaitHandle.SafeWaitHandle.DangerousGetHandle();
notify.SetNotificationPositions(3, notifies);
}
}
}
private void InitializeDirectSound()
{
// Open DirectSound
lock (this.m_LockObject)
{
directSound = null;
DirectSoundCreate(ref device, out directSound, IntPtr.Zero);
if (directSound != null)
{
// Set Cooperative Level to PRIORITY (priority level can call the SetFormat and Compact methods)
directSound.SetCooperativeLevel(GetDesktopWindow(), DirectSoundCooperativeLevel.DSSCL_PRIORITY);
// -------------------------------------------------------------------------------------
// Create PrimaryBuffer
// -------------------------------------------------------------------------------------
// Fill BufferDescription for PrimaryBuffer
BufferDescription bufferDesc = new BufferDescription();
bufferDesc.dwSize = Marshal.SizeOf(bufferDesc);
bufferDesc.dwBufferBytes = 0;
bufferDesc.dwFlags = DirectSoundBufferCaps.DSBCAPS_PRIMARYBUFFER;
bufferDesc.dwReserved = 0;
bufferDesc.lpwfxFormat = IntPtr.Zero;
bufferDesc.guidAlgo = Guid.Empty;
object soundBufferObj;
// Create PrimaryBuffer
directSound.CreateSoundBuffer(bufferDesc, out soundBufferObj, IntPtr.Zero);
primarySoundBuffer = (IDirectSoundBuffer)soundBufferObj;
// Play & Loop on the PrimarySound Buffer
primarySoundBuffer.Play(0, 0, DirectSoundPlayFlags.DSBPLAY_LOOPING);
// -------------------------------------------------------------------------------------
// Create SecondaryBuffer
// -------------------------------------------------------------------------------------
// A frame of samples equals to Desired Latency
samplesFrameSize = MsToBytes(desiredLatency);
// Fill BufferDescription for SecondaryBuffer
BufferDescription bufferDesc2 = new BufferDescription();
bufferDesc2.dwSize = Marshal.SizeOf(bufferDesc2);
bufferDesc2.dwBufferBytes = (uint)(samplesFrameSize * 2);
bufferDesc2.dwFlags = DirectSoundBufferCaps.DSBCAPS_GETCURRENTPOSITION2
| DirectSoundBufferCaps.DSBCAPS_CTRLPOSITIONNOTIFY
| DirectSoundBufferCaps.DSBCAPS_GLOBALFOCUS
| DirectSoundBufferCaps.DSBCAPS_CTRLVOLUME
| DirectSoundBufferCaps.DSBCAPS_STICKYFOCUS;
bufferDesc2.dwReserved = 0;
GCHandle handleOnWaveFormat = GCHandle.Alloc(waveFormat, GCHandleType.Pinned); // Ptr to waveFormat
bufferDesc2.lpwfxFormat = handleOnWaveFormat.AddrOfPinnedObject(); // set Ptr to waveFormat
bufferDesc2.guidAlgo = Guid.Empty;
// Create SecondaryBuffer
directSound.CreateSoundBuffer(bufferDesc2, out soundBufferObj, IntPtr.Zero);
secondaryBuffer = (IDirectSoundBuffer)soundBufferObj;
handleOnWaveFormat.Free();
// Get effective SecondaryBuffer size
BufferCaps dsbCaps = new BufferCaps();
dsbCaps.dwSize = Marshal.SizeOf(dsbCaps);
secondaryBuffer.GetCaps(dsbCaps);
nextSamplesWriteIndex = 0;
samplesTotalSize = dsbCaps.dwBufferBytes;
samples = new byte[samplesTotalSize];
System.Diagnostics.Debug.Assert(samplesTotalSize == (2 * samplesFrameSize), "Invalid SamplesTotalSize vs SamplesFrameSize");
// -------------------------------------------------------------------------------------
// Create double buffering notification.
// Use DirectSoundNotify at Position [0, 1/2] and Stop Position (0xFFFFFFFF)
// -------------------------------------------------------------------------------------
IDirectSoundNotify notify = (IDirectSoundNotify)soundBufferObj;
frameEventWaitHandle1 = new EventWaitHandle(false, EventResetMode.AutoReset);
frameEventWaitHandle2 = new EventWaitHandle(false, EventResetMode.AutoReset);
endEventWaitHandle = new EventWaitHandle(false, EventResetMode.AutoReset);
DirectSoundBufferPositionNotify[] notifies = new DirectSoundBufferPositionNotify[3];
notifies[0] = new DirectSoundBufferPositionNotify();
notifies[0].dwOffset = 0;
notifies[0].hEventNotify = frameEventWaitHandle1.SafeWaitHandle.DangerousGetHandle();
notifies[1] = new DirectSoundBufferPositionNotify();
notifies[1].dwOffset = (uint)samplesFrameSize;
notifies[1].hEventNotify = frameEventWaitHandle2.SafeWaitHandle.DangerousGetHandle();
notifies[2] = new DirectSoundBufferPositionNotify();
notifies[2].dwOffset = 0xFFFFFFFF;
notifies[2].hEventNotify = endEventWaitHandle.SafeWaitHandle.DangerousGetHandle();
notify.SetNotificationPositions(3, notifies);
}
}
}