/// <summary>
/// Begin to play
/// </summary>
internal override void End()
{
if (!_deviceOpen)
{
System.Diagnostics.Debug.Assert(false);
throw new InvalidOperationException();
}
lock (_noWriteOutLock)
{
_deviceOpen = false;
CheckForAbort();
if (_queueIn.Count != 0)
{
Interop.WinMM.waveOutReset(_hwo);
}
// Close it; no point in returning errors if this fails
Interop.WinMM.MMSYSERR result = Interop.WinMM.waveOutClose(_hwo);
if (result != Interop.WinMM.MMSYSERR.NOERROR)
{
// This may create a dead lock
System.Diagnostics.Debug.Assert(false);
}
}
}
/// <summary>
/// Play a wave file.
/// </summary>
internal override void Play(byte[] buffer)
{
if (!_deviceOpen)
{
System.Diagnostics.Debug.Assert(false);
}
else
{
int bufferSize = buffer.Length;
_bytesWritten += bufferSize;
System.Diagnostics.Debug.Assert(bufferSize % _blockAlign == 0);
WaveHeader waveHeader = new(buffer);
GCHandle waveHdr = waveHeader.WAVEHDR;
Interop.WinMM.MMSYSERR result = Interop.WinMM.waveOutPrepareHeader(_hwo, waveHdr.AddrOfPinnedObject(), waveHeader.SizeHDR);
if (result != Interop.WinMM.MMSYSERR.NOERROR)
{
throw new AudioException(result);
}
lock (_noWriteOutLock)
{
if (!_aborted)
{
lock (_queueIn)
{
InItem item = new(waveHeader);
_queueIn.Add(item);
// Something in the queue cannot exit anymore
_evt.Reset();
}
// Start playback of the first buffer
result = Interop.WinMM.waveOutWrite(_hwo, waveHdr.AddrOfPinnedObject(), waveHeader.SizeHDR);
if (result != Interop.WinMM.MMSYSERR.NOERROR)
{
lock (_queueIn)
{
_queueIn.RemoveAt(_queueIn.Count - 1);
throw new AudioException(result);
}
}
}
}
}
}
/// <summary>
/// Get the name of the specified playback device.
/// </summary>
/// <param name="deviceId">ID of the device</param>
/// <param name="prodName">Destination string assigned the name</param>
/// <returns>MMSYSERR.NOERROR if successful</returns>
internal static Interop.WinMM.MMSYSERR GetDeviceName(int deviceId, [MarshalAs(UnmanagedType.LPWStr)] out string prodName)
{
prodName = string.Empty;
Interop.WinMM.WAVEOUTCAPS caps = new();
Interop.WinMM.MMSYSERR result = Interop.WinMM.waveOutGetDevCaps((IntPtr)deviceId, ref caps, Marshal.SizeOf <Interop.WinMM.WAVEOUTCAPS>());
if (result != Interop.WinMM.MMSYSERR.NOERROR)
{
return(result);
}
prodName = caps.szPname;
return(Interop.WinMM.MMSYSERR.NOERROR);
}
private void ClearBuffers()
{
foreach (InItem item in _queueOut)
{
WaveHeader waveHeader = item._waveHeader;
Interop.WinMM.MMSYSERR result = Interop.WinMM.waveOutUnprepareHeader(
_hwo, waveHeader.WAVEHDR.AddrOfPinnedObject(), waveHeader.SizeHDR);
if (result != Interop.WinMM.MMSYSERR.NOERROR)
{
//System.Diagnostics.Debug.Assert (false);
}
waveHeader.Dispose();
}
_queueOut.Clear();
}
/// <summary>
/// Resume the playback of a paused sound.
/// </summary>
internal override void Resume()
{
lock (_noWriteOutLock)
{
if (!_aborted && _fPaused)
{
if (_deviceOpen)
{
Interop.WinMM.MMSYSERR result = Interop.WinMM.waveOutRestart(_hwo);
if (result != Interop.WinMM.MMSYSERR.NOERROR)
{
System.Diagnostics.Debug.Assert(false);
}
}
}
}
_fPaused = false;
}
/// <summary>
/// Pause the playback of a sound.
/// </summary>
internal override void Pause()
{
lock (_noWriteOutLock)
{
if (!_aborted && !_fPaused)
{
if (_deviceOpen)
{
Interop.WinMM.MMSYSERR result = Interop.WinMM.waveOutPause(_hwo);
if (result != Interop.WinMM.MMSYSERR.NOERROR)
{
System.Diagnostics.Debug.Assert(false, ((int)result).ToString(System.Globalization.CultureInfo.InvariantCulture));
}
}
_fPaused = true;
}
}
}
internal AudioException(Interop.WinMM.MMSYSERR errorCode) : base(string.Format(System.Globalization.CultureInfo.InvariantCulture, "{0} - Error Code: 0x{1:x}", SR.Get(SRID.AudioDeviceError), (int)errorCode))
{
}