private void OnBufferDone(WaveOutBuffer buffer)
{
if (playbackState == PlaybackState.Playing)
{
if (!buffer.OnDone())
{
playbackState = PlaybackState.Stopped;
RaisePlaybackStopped();
}
}
}
/// <summary>
/// Made non-static so that playing can be stopped here
/// </summary>
/// <param name="hWaveOut"></param>
/// <param name="uMsg"></param>
/// <param name="dwInstance"></param>
/// <param name="wavhdr"></param>
/// <param name="dwReserved"></param>
private void Callback(IntPtr hWaveOut, WaveMessage uMsg, IntPtr dwInstance, WaveHeader wavhdr, IntPtr dwReserved)
{
if (uMsg == 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
{
// set explicitly for when we reach the end of the audio.
_playbackState = PlaybackState.Stopped;
RaisePlaybackStoppedEvent(exception, (_pressStop ? false : true));
}
}
}
}
