/// <summary>
/// Stop playback
/// </summary>
private void StopPlayback()
{
lock (this.m_LockObject)
{
if (secondaryBuffer != null)
{
CleanUpSecondaryBuffer();
secondaryBuffer.Stop();
Marshal.ReleaseComObject(secondaryBuffer);
secondaryBuffer = null;
}
if (primarySoundBuffer != null)
{
primarySoundBuffer.Stop();
Marshal.ReleaseComObject(primarySoundBuffer);
primarySoundBuffer = null;
}
if (directSound != null)
{
Marshal.ReleaseComObject(directSound);
directSound = null;
}
}
}
public void Dispose()
{
// This doesn't follow the Microsoft Dispose pattern because that one sucks (http://nitoprograms.blogspot.com/2009/08/how-to-implement-idisposable-and.html)
// This also doesn't follow the Cleary's pattern because it's too much work.
// If an IDisposable field were added to this class, this code would need further work because of that, but until then this is acceptable.
if (soundBufferDescription.lpwfxFormat != IntPtr.Zero)
{
Marshal.FreeHGlobal(soundBufferDescription.lpwfxFormat);
soundBufferDescription.lpwfxFormat = IntPtr.Zero;
}
if (directSoundDevice != null)
{
Marshal.ReleaseComObject(directSoundDevice);
directSoundDevice = null;
}
}
public Beeper()
{
// Silently fail DirectSound creation
if (!WinAPI.ModuleContainsFunction(DirectSoundModuleName, "DirectSoundCreate", true, true))
{
return;
}
if (DirectSoundCreate(IntPtr.Zero, out directSoundDevice, IntPtr.Zero) < 0)
{
return;
}
if (directSoundDevice.SetCooperativeLevel(GetDesktopWindow(), DSSCL_NORMAL) < 0)
{
Marshal.ReleaseComObject(directSoundDevice);
directSoundDevice = null;
return;
}
WAVEFORMATEX waveFormat;
waveFormat.cbSize = (short)Marshal.SizeOf(typeof(WAVEFORMATEX));
waveFormat.wFormatTag = WAVE_FORMAT_PCM;
waveFormat.nChannels = NumberOfChannels;
waveFormat.wBitsPerSample = BitsPerSamplePerChannel;
waveFormat.nSamplesPerSec = SamplingRate;
waveFormat.nBlockAlign = (short)(waveFormat.nChannels * waveFormat.wBitsPerSample / 8);
waveFormat.nAvgBytesPerSec = waveFormat.nSamplesPerSec * waveFormat.nBlockAlign;
// The wave format never changes so we marshal it to unmanaged memory and reuse it in calls
// to CreateSoundBuffer.
IntPtr unmanagedWaveFormat = Marshal.AllocHGlobal(waveFormat.cbSize);
Marshal.StructureToPtr(waveFormat, unmanagedWaveFormat, false);
// These fields never change
soundBufferDescription.dwSize = Marshal.SizeOf(typeof(DSBUFFERDESC));
soundBufferDescription.dwReserved = 0;
soundBufferDescription.dwFlags = DSBCAPS_CTRLPOSITIONNOTIFY | DSBCAPS_CTRLFREQUENCY | DSBCAPS_GLOBALFOCUS;
soundBufferDescription.lpwfxFormat = unmanagedWaveFormat;
}
public Beeper()
{
// Silently fail DirectSound creation
if (!WinAPI.ModuleContainsFunction(DirectSoundModuleName, "DirectSoundCreate", true, true))
return;
if (DirectSoundCreate(IntPtr.Zero, out directSoundDevice, IntPtr.Zero) < 0)
return;
if (directSoundDevice.SetCooperativeLevel(GetDesktopWindow(), DSSCL_NORMAL) < 0)
{
Marshal.ReleaseComObject(directSoundDevice);
directSoundDevice = null;
return;
}
WAVEFORMATEX waveFormat;
waveFormat.cbSize = (short) Marshal.SizeOf(typeof(WAVEFORMATEX));
waveFormat.wFormatTag = WAVE_FORMAT_PCM;
waveFormat.nChannels = NumberOfChannels;
waveFormat.wBitsPerSample = BitsPerSamplePerChannel;
waveFormat.nSamplesPerSec = SamplingRate;
waveFormat.nBlockAlign = (short) (waveFormat.nChannels * waveFormat.wBitsPerSample / 8);
waveFormat.nAvgBytesPerSec = waveFormat.nSamplesPerSec * waveFormat.nBlockAlign;
// The wave format never changes so we marshal it to unmanaged memory and reuse it in calls
// to CreateSoundBuffer.
IntPtr unmanagedWaveFormat = Marshal.AllocHGlobal(waveFormat.cbSize);
Marshal.StructureToPtr(waveFormat, unmanagedWaveFormat, false);
// These fields never change
soundBufferDescription.dwSize = Marshal.SizeOf(typeof(DSBUFFERDESC));
soundBufferDescription.dwReserved = 0;
soundBufferDescription.dwFlags = DSBCAPS_CTRLPOSITIONNOTIFY | DSBCAPS_CTRLFREQUENCY | DSBCAPS_GLOBALFOCUS;
soundBufferDescription.lpwfxFormat = unmanagedWaveFormat;
}
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);
}
}
}
static extern void DirectSoundCreate(ref Guid GUID, [Out, MarshalAs(UnmanagedType.Interface)] out IDirectSound directSound, IntPtr pUnkOuter);
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);
}
}
}
extern static int DirectSoundCreate(IntPtr pcGuidDevice, out IDirectSound ppDS, IntPtr pUnkOuter);
public static extern int DirectSoundCreate(IntPtr pcGuidDevice, [MarshalAs(UnmanagedType.Interface)] out IDirectSound pDS, IntPtr pUnkOuter);
static extern int DirectSoundCreate(IntPtr pcGuidDevice, out IDirectSound ppDS, IntPtr pUnkOuter);
public void Dispose()
{
// This doesn't follow the Microsoft Dispose pattern because that one sucks (http://nitoprograms.blogspot.com/2009/08/how-to-implement-idisposable-and.html)
// This also doesn't follow the Cleary's pattern because it's too much work.
// If an IDisposable field were added to this class, this code would need further work because of that, but until then this is acceptable.
if (soundBufferDescription.lpwfxFormat != IntPtr.Zero)
{
Marshal.FreeHGlobal(soundBufferDescription.lpwfxFormat);
soundBufferDescription.lpwfxFormat = IntPtr.Zero;
}
if (directSoundDevice != null)
{
Marshal.ReleaseComObject(directSoundDevice);
directSoundDevice = null;
}
}
