protected override void WndProc(ref Message m)
{
WaveInterop.WaveMessage msg = (WaveInterop.WaveMessage)m.Msg;
switch (msg)
{
case WaveInterop.WaveMessage.WaveOutOpen:
case WaveInterop.WaveMessage.WaveOutClose:
case WaveInterop.WaveMessage.WaveInOpen:
case WaveInterop.WaveMessage.WaveInClose:
this.waveCallback(m.WParam, msg, IntPtr.Zero, null, IntPtr.Zero);
return;
case WaveInterop.WaveMessage.WaveOutDone:
case WaveInterop.WaveMessage.WaveInData:
{
IntPtr wParam = m.WParam;
WaveHeader waveHeader = new WaveHeader();
Marshal.PtrToStructure(m.LParam, waveHeader);
this.waveCallback(wParam, msg, IntPtr.Zero, waveHeader, IntPtr.Zero);
return;
}
default:
base.WndProc(ref m);
return;
}
}
public WaveInBuffer(IntPtr waveInHandle, int bufferSize)
{
this.bufferSize = bufferSize;
this.buffer = new byte[bufferSize];
this.hBuffer = GCHandle.Alloc(this.buffer, GCHandleType.Pinned);
this.waveInHandle = waveInHandle;
this.header = new WaveHeader();
this.hHeader = GCHandle.Alloc(this.header, GCHandleType.Pinned);
this.header.dataBuffer = this.hBuffer.AddrOfPinnedObject();
this.header.bufferLength = bufferSize;
this.header.loops = 1;
this.hThis = GCHandle.Alloc(this);
this.header.userData = (IntPtr)this.hThis;
MmException.Try(WaveInterop.waveInPrepareHeader(waveInHandle, this.header, Marshal.SizeOf(this.header)), "waveInPrepareHeader");
}
public WaveOutBuffer(IntPtr hWaveOut, int bufferSize, IWaveProvider bufferFillStream, object waveOutLock)
{
this.bufferSize = bufferSize;
this.buffer = new byte[bufferSize];
this.hBuffer = GCHandle.Alloc(this.buffer, GCHandleType.Pinned);
this.hWaveOut = hWaveOut;
this.waveStream = bufferFillStream;
this.waveOutLock = waveOutLock;
this.header = new WaveHeader();
this.hHeader = GCHandle.Alloc(this.header, GCHandleType.Pinned);
this.header.dataBuffer = this.hBuffer.AddrOfPinnedObject();
this.header.bufferLength = bufferSize;
this.header.loops = 1;
this.hThis = GCHandle.Alloc(this);
this.header.userData = (IntPtr)this.hThis;
lock (waveOutLock)
{
MmException.Try(WaveInterop.waveOutPrepareHeader(hWaveOut, this.header, Marshal.SizeOf(this.header)), "waveOutPrepareHeader");
}
}
// made non-static so that playing can be stopped here
private void Callback(IntPtr hWaveOut, WaveInterop.WaveMessage uMsg, IntPtr dwInstance, WaveHeader wavhdr, IntPtr dwReserved)
{
if (uMsg == WaveInterop.WaveMessage.WaveOutDone)
{
GCHandle hBuffer = (GCHandle)wavhdr.userData;
WaveOutBuffer buffer = (WaveOutBuffer)hBuffer.Target;
Interlocked.Decrement(ref queuedBuffers);
Exception exception = null;
// check that we're not here through pressing stop
if (PlaybackState == PlaybackState.Playing)
{
// to avoid deadlocks in Function callback mode,
// we lock round this whole thing, which will include the
// reading from the stream.
// this protects us from calling waveOutReset on another
// thread while a WaveOutWrite is in progress
lock (waveOutLock)
{
try
{
if (buffer.OnDone())
{
Interlocked.Increment(ref queuedBuffers);
}
}
catch (Exception e)
{
// one likely cause is soundcard being unplugged
exception = e;
}
}
}
if (queuedBuffers == 0)
{
if (callbackInfo.Strategy == WaveCallbackStrategy.FunctionCallback && playbackState == Wave.PlaybackState.Stopped)
{
// the user has pressed stop
// DO NOT raise the playback stopped event from here
// since on the main thread we are still in the waveOutReset function
// Playback stopped will be raised elsewhere
}
else
{
playbackState = PlaybackState.Stopped; // set explicitly for when we reach the end of the audio
RaisePlaybackStoppedEvent(exception);
}
}
}
}
private void Callback(IntPtr waveInHandle, WaveInterop.WaveMessage message, IntPtr userData, WaveHeader waveHeader, IntPtr reserved)
{
if (message == WaveInterop.WaveMessage.WaveInData && this.recording)
{
WaveInBuffer waveInBuffer = (WaveInBuffer)((GCHandle)waveHeader.userData).Target;
if (waveInBuffer == null)
{
return;
}
this.lastReturnedBufferIndex = Array.IndexOf <WaveInBuffer>(this.buffers, waveInBuffer);
this.RaiseDataAvailable(waveInBuffer);
try
{
waveInBuffer.Reuse();
}
catch (Exception e)
{
this.recording = false;
this.RaiseRecordingStopped(e);
}
}
}
public static extern MmResult waveOutWrite(IntPtr hWaveOut, WaveHeader lpWaveOutHdr, int uSize);
public static extern MmResult waveOutUnprepareHeader(IntPtr hWaveOut, WaveHeader lpWaveOutHdr, int uSize);
public static extern MmResult waveInPrepareHeader(IntPtr hWaveIn, WaveHeader lpWaveInHdr, int uSize);
public static extern MmResult waveInAddBuffer(IntPtr hWaveIn, WaveHeader pwh, int cbwh);
