/// <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;
buffer = new byte[bufferSize];
hBuffer = GCHandle.Alloc(buffer, GCHandleType.Pinned);
this.hWaveOut = hWaveOut;
waveStream = bufferFillStream;
this.waveOutLock = waveOutLock;
// Added by charley at 2013/4/9
ChannelMode = WaveOutChannelMode.Default;
mVolumnSize = 1;
mLeftVolumn = true;
mVolumnSize = bufferFillStream.WaveFormat.BitsPerSample / 8;
header = new WaveHeader();
hHeader = GCHandle.Alloc(header);
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");
}
}
protected override void WndProc(ref Message m)
{
WaveInterop.WaveMessage message = (WaveInterop.WaveMessage)m.Msg;
switch (message)
{
case WaveInterop.WaveMessage.WaveOutDone:
case WaveInterop.WaveMessage.WaveInData:
IntPtr hOutputDevice = m.WParam;
WaveHeader waveHeader = new WaveHeader();
Marshal.PtrToStructure(m.LParam, waveHeader);
waveCallback(hOutputDevice, message, IntPtr.Zero, waveHeader, IntPtr.Zero);
break;
case WaveInterop.WaveMessage.WaveOutOpen:
case WaveInterop.WaveMessage.WaveOutClose:
case WaveInterop.WaveMessage.WaveInClose:
case WaveInterop.WaveMessage.WaveInOpen:
waveCallback(m.WParam, message, IntPtr.Zero, null, IntPtr.Zero);
break;
default:
base.WndProc(ref m);
break;
}
}
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;
buffer = new byte[bufferSize];
hBuffer = GCHandle.Alloc(buffer, GCHandleType.Pinned);
this.waveInHandle = waveInHandle;
header = new WaveHeader();
hHeader = GCHandle.Alloc(header);
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");
}
/// <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)
{
var hBuffer = (GCHandle)waveHeader.userData;
var buffer = (WaveInBuffer)hBuffer.Target;
if (recording)
{
lastReturnedBufferIndex = Array.IndexOf(buffers, buffer);
RaiseDataAvailable(buffer);
try
{
buffer.Reuse();
}
catch (Exception e)
{
recording = false;
RaiseRecordingStopped(e);
}
}
}
}
// 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 == 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
{
RaisePlaybackStoppedEvent(exception);
}
}
}
}
public static extern MmResult waveInUnprepareHeader(IntPtr hWaveIn, WaveHeader lpWaveInHdr, int uSize);
public static extern MmResult waveInAddBuffer(IntPtr hWaveIn, WaveHeader pwh, int cbwh);
public static extern MmResult waveOutWrite(IntPtr hWaveOut, WaveHeader lpWaveOutHdr, int uSize);
public static extern MmResult waveOutPrepareHeader(IntPtr hWaveOut, WaveHeader lpWaveOutHdr, int uSize);