private void PlaybackProc(object o)
{
EventWaitHandle waitHandle = o as EventWaitHandle;
EventWaitHandle[] waitHandles = null;
try
{
//004
//bool flag = true;
int bufferSize = _secondaryBuffer.BufferCaps.dwBufferBytes;
int latencyBytes = (int)_source.WaveFormat.MillisecondsToBytes(_latency);
byte[] buffer = new byte[bufferSize];
_primaryBuffer.Play(DSBPlayFlags.DSBPLAY_LOOPING); //default flags: looping
//003
/*if (flag) //could refill buffer
{*/
/*
* Setup notify
*/
var waitHandleNull = new EventWaitHandle(false, EventResetMode.AutoReset);
var waitHandle0 = new EventWaitHandle(false, EventResetMode.AutoReset);
var waitHandleEnd = new EventWaitHandle(false, EventResetMode.AutoReset);
waitHandles = new EventWaitHandle[]{ waitHandleNull, waitHandle0, waitHandleEnd };
_directSoundNotify = _secondaryBuffer.QueryInterface<DirectSoundNotify>();
DSBPositionNotify[] positionNotifies =
{
new DSBPositionNotify()
{
dwOffset = DSBPositionNotify.OffsetZero,
hEventNotify = waitHandleNull.SafeWaitHandle.DangerousGetHandle()
},
new DSBPositionNotify()
{
dwOffset = (uint)_source.WaveFormat.MillisecondsToBytes(_latency),
hEventNotify = waitHandle0.SafeWaitHandle.DangerousGetHandle()
},
new DSBPositionNotify()
{
dwOffset = DSBPositionNotify.OffsetEnd,
hEventNotify = waitHandleEnd.SafeWaitHandle.DangerousGetHandle()
}
};
_directSoundNotify.SetNotificationPositions(positionNotifies);
int waitHandleTimeout = waitHandles.Length * _latency;
//001
/*if (PlaybackState == SoundOut.PlaybackState.Stopped)
{
_secondaryBuffer.SetCurrentPosition(0);
flag = RefillBuffer(buffer, 0, bufferSize);
}*/
//002
_secondaryBuffer.SetCurrentPosition(0);
_secondaryBuffer.Play(DSBPlayFlags.DSBPLAY_LOOPING); //default flags: looping
_playbackState = SoundOut.PlaybackState.Playing;
if (waitHandle != null)
waitHandle.Set();
while (PlaybackState != SoundOut.PlaybackState.Stopped)
{
int waitHandleIndex = WaitHandle.WaitAny(waitHandles, waitHandleTimeout, true);
bool isTimeOut = waitHandleIndex == WaitHandle.WaitTimeout;
//dsound stopped
//case of end of buffer or Stop() called: http://msdn.microsoft.com/en-us/library/windows/desktop/microsoft.directx_sdk.reference.dsbpositionnotify(v=vs.85).aspx
bool isBufferStopped = waitHandleIndex == (waitHandles.Length - 1);
int sampleOffset = (waitHandleIndex == 0 ? 1 : 0) * latencyBytes;
//bug: sampleOffset = count
if (isTimeOut == false && isBufferStopped == false)
{
/*
* Refill the buffer
*/
if (RefillBuffer(buffer, sampleOffset, latencyBytes) == false)
{
_playbackState = SoundOut.PlaybackState.Stopped;
}
}
else
{
_playbackState = SoundOut.PlaybackState.Stopped;
}
}
/*}
else
{
_playbackState = SoundOut.PlaybackState.Stopped;
}*/
}
finally
{
if (_directSoundNotify != null)
{
_directSoundNotify.Dispose();
_directSoundNotify = null;
}
if (_secondaryBuffer != null)
{
_secondaryBuffer.Stop();
}
if (_primaryBuffer != null)
{
_primaryBuffer.Stop();
}
if (waitHandles != null)
{
foreach (var wh in waitHandles)
{
wh.Close();
}
}
RaiseStopped();
}
}
private void CleanupRessources()
{
if (_directSoundNotify != null)
{
_directSoundNotify.Dispose();
_directSoundNotify = null;
}
if (_secondaryBuffer != null)
{
_secondaryBuffer.Stop();
_secondaryBuffer.Dispose();
_secondaryBuffer = null;
}
if (_primaryBuffer != null)
{
_primaryBuffer.Stop();
_primaryBuffer.Dispose();
_primaryBuffer = null;
}
if (_directSound != null)
{
_directSound.Dispose();
_directSound = null;
}
//_isInitialized = false;
}
