internal MmResult WaveOutOpen(out IntPtr waveOutHandle, int deviceNumber, WaveFormat waveFormat, WaveInterop.WaveCallback callback)
{
MmResult result;
if (Strategy == WaveCallbackStrategy.FunctionCallback)
{
result = WaveInterop.waveOutOpen(out waveOutHandle, (IntPtr)deviceNumber, waveFormat, callback, IntPtr.Zero, WaveInterop.WaveInOutOpenFlags.CallbackFunction);
}
else
{
result = WaveInterop.waveOutOpenWindow(out waveOutHandle, (IntPtr)deviceNumber, waveFormat, this.Handle, IntPtr.Zero, WaveInterop.WaveInOutOpenFlags.CallbackWindow);
}
return result;
}
internal void Connect(WaveInterop.WaveCallback callback)
{
if (Strategy == WaveCallbackStrategy.NewWindow)
{
waveOutWindow = new WaveWindow(callback);
waveOutWindow.CreateControl();
this.Handle = waveOutWindow.Handle;
}
else if (Strategy == WaveCallbackStrategy.ExistingWindow)
{
waveOutWindowNative = new WaveWindowNative(callback);
waveOutWindowNative.AssignHandle(this.Handle);
}
}
private GCHandle hThis; // for the user callback
/// <summary>
/// creates a new wavebuffer
/// </summary>
/// <param name="waveInHandle">WaveIn device to write to</param>
/// <param name="bufferSize">Buffer size in bytes</param>
public WaveInBuffer(IntPtr waveInHandle, Int32 bufferSize)
{
this.bufferSize = bufferSize;
this.buffer = new byte[bufferSize];
this.hBuffer = GCHandle.Alloc(buffer, GCHandleType.Pinned);
this.waveInHandle = waveInHandle;
header = new WaveHeader();
hHeader = GCHandle.Alloc(header, GCHandleType.Pinned);
header.dataBuffer = hBuffer.AddrOfPinnedObject();
header.bufferLength = bufferSize;
header.loops = 1;
hThis = GCHandle.Alloc(this);
header.userData = (IntPtr)hThis;
MmException.Try(WaveInterop.waveInPrepareHeader(waveInHandle, header, Marshal.SizeOf(header)), "waveInPrepareHeader");
//MmException.Try(WaveInterop.waveInAddBuffer(waveInHandle, header, Marshal.SizeOf(header)), "waveInAddBuffer");
}
private void CloseWaveInDevice()
{
if (waveInHandle == IntPtr.Zero)
{
return;
}
// Some drivers need the reset to properly release buffers
WaveInterop.waveInReset(waveInHandle);
if (buffers != null)
{
for (int n = 0; n < buffers.Length; n++)
{
buffers[n].Dispose();
}
buffers = null;
}
WaveInterop.waveInClose(waveInHandle);
waveInHandle = IntPtr.Zero;
}
/// <summary>
/// Stop and reset the WaveOut device
/// </summary>
public void Stop()
{
if (playbackState != PlaybackState.Stopped)
{
// in the call to waveOutReset with function callbacks
// some drivers will block here until OnDone is called
// for every buffer
playbackState = PlaybackState.Stopped; // set this here to avoid a problem with some drivers whereby
MmResult result;
lock (waveOutLock)
{
result = WaveInterop.waveOutReset(hWaveOut);
}
if (result != MmResult.NoError)
{
throw new MmException(result, "waveOutReset");
}
callbackEvent.Set(); // give the thread a kick, make sure we exit
}
}
private GCHandle hThis; // for the user callback
/// <summary>
/// creates a new wavebuffer
/// </summary>
/// <param name="hWaveOut">WaveOut device to write to</param>
/// <param name="bufferSize">Buffer size in bytes</param>
/// <param name="bufferFillStream">Stream to provide more data</param>
/// <param name="waveOutLock">Lock to protect WaveOut API's from being called on >1 thread</param>
public WaveOutBuffer(IntPtr hWaveOut, Int32 bufferSize, IWaveProvider bufferFillStream, object waveOutLock)
{
this.bufferSize = bufferSize;
this.buffer = new byte[bufferSize];
this.hBuffer = GCHandle.Alloc(buffer, GCHandleType.Pinned);
this.hWaveOut = hWaveOut;
this.waveStream = bufferFillStream;
this.waveOutLock = waveOutLock;
header = new WaveHeader();
hHeader = GCHandle.Alloc(header, GCHandleType.Pinned);
header.dataBuffer = hBuffer.AddrOfPinnedObject();
header.bufferLength = bufferSize;
header.loops = 1;
hThis = GCHandle.Alloc(this);
header.userData = (IntPtr)hThis;
lock (waveOutLock)
{
MmException.Try(WaveInterop.waveOutPrepareHeader(hWaveOut, header, Marshal.SizeOf(header)), "waveOutPrepareHeader");
}
}
/// <summary>
/// Stop recording
/// </summary>
public void StopRecording()
{
if (recording)
{
recording = false;
MmException.Try(WaveInterop.waveInStop(waveInHandle), "waveInStop");
// report the last buffers, sometimes more than one, so taking care to report them in the right order
for (int n = 0; n < buffers.Length; n++)
{
int index = (n + lastReturnedBufferIndex + 1) % buffers.Length;
var buffer = buffers[index];
if (buffer.Done)
{
RaiseDataAvailable(buffer);
}
}
RaiseRecordingStopped(null);
}
//MmException.Try(WaveInterop.waveInReset(waveInHandle), "waveInReset");
// Don't actually close yet so we get the last buffer
}
internal static void SetWaveOutVolume(float value, IntPtr hWaveOut, object lockObject)
{
if (value < 0)
{
throw new ArgumentOutOfRangeException("value", "Volume must be between 0.0 and 1.0");
}
if (value > 1)
{
throw new ArgumentOutOfRangeException("value", "Volume must be between 0.0 and 1.0");
}
float left = value;
float right = value;
int stereoVolume = (int)(left * 0xFFFF) + ((int)(right * 0xFFFF) << 16);
MmResult result;
lock (lockObject)
{
result = WaveInterop.waveOutSetVolume(hWaveOut, stereoVolume);
}
MmException.Try(result, "waveOutSetVolume");
}
/// <summary>
/// Called when we get a new buffer of recorded data
/// </summary>
private void Callback(IntPtr waveInHandle, WaveInterop.WaveMessage message, IntPtr userData, WaveHeader waveHeader, IntPtr reserved)
{
if (message == WaveInterop.WaveMessage.WaveInData)
{
if (recording)
{
var hBuffer = (GCHandle)waveHeader.userData;
var buffer = (WaveInBuffer)hBuffer.Target;
if (buffer == null) return;
lastReturnedBufferIndex = Array.IndexOf(buffers, buffer);
RaiseDataAvailable(buffer);
try
{
buffer.Reuse();
}
catch (Exception e)
{
recording = false;
RaiseRecordingStopped(e);
}
}
}
}
/// <summary>
/// Stop recording
/// </summary>
public void StopRecording()
{
recording = false;
this.callbackEvent.Set(); // signal the thread to exit
MmException.Try(WaveInterop.waveInStop(waveInHandle), "waveInStop");
}
// 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);
}
}
}
}