/// <summary>
/// Resumes playing after a pause from the same position.
/// </summary>
void Resume()
{
if (PlaybackState == PlaybackState.Paused)
{
MultimediaResult result;
lock (_waveOutLock)
{
result = WaveInterop.waveOutRestart(_hWaveOut);
}
if (result != MultimediaResult.NoError)
{
throw new MultimediaException(result, "waveOutRestart");
}
PlaybackState = PlaybackState.Playing;
}
}
/// <summary>
/// Pauses the audio.
/// </summary>
internal void Pause()
{
if (PlaybackState == PlaybackState.Playing)
{
PlaybackState = PlaybackState.Paused; // set this here to avoid a deadlock problem with some drivers
MultimediaResult result;
lock (_waveOutLock)
{
result = WaveInterop.waveOutPause(_hWaveOut);
}
if (result != MultimediaResult.NoError)
{
throw new MultimediaException(result, "waveOutPause");
}
}
}
/// <summary>
/// Gets the position of the waveout stream from the WindowsAPI.
/// </summary>
/// <returns></returns>
internal uint GetPosition()
{
lock (_waveOutLock)
{
var multimediaTime = new MultimediaTime();
multimediaTime.wType = MultimediaTime.TIME_BYTES;
MultimediaException.Try(WaveInterop.waveOutGetPosition(_hWaveOut,
ref multimediaTime,
Marshal.SizeOf(multimediaTime)),
"waveOutGetPosition");
// if (multimediaTime.wType != MultimediaTime.TIME_BYTES)
// throw new Exception(string.Format("waveOutGetPosition: wType -> Expected {0}, Received {1}",
// MultimediaTime.TIME_BYTES, multimediaTime.wType));
return(multimediaTime.cb);
}
}
/// <summary>
/// Stops and resets the WaveOut device.
/// </summary>
internal void Stop()
{
if (PlaybackState != PlaybackState.Stopped)
{
// in the call to waveOutReset with function callbacks some drivers
// will block here until done() is called for every buffer
PlaybackState = PlaybackState.Stopped; // set this here to avoid a problem with some drivers
MultimediaResult result;
lock (_waveOutLock)
{
result = WaveInterop.waveOutReset(_hWaveOut);
}
if (result != MultimediaResult.NoError)
{
throw new MultimediaException(result, "waveOutReset");
}
_callbackEvent.Set(); // give the thread a kick to force it to exit.
}
}