public WaveOutBuffer(int size)
{
_hdr = new Native.WAVEHDR();
_gchThis = GCHandle.Alloc(this);
_gchHdr = GCHandle.Alloc(_hdr, GCHandleType.Pinned);
_hdr.dwUser = (IntPtr)_gchThis;
_data = new byte[size];
_gchData = GCHandle.Alloc(_data, GCHandleType.Pinned);
_hdr.lpData = _gchData.AddrOfPinnedObject();
_hdr.dwBufferLength = size;
}
internal static void WaveOutProc(IntPtr hdrvr, int uMsg, IntPtr dwInstance, IntPtr dwParam1, IntPtr dwParam2)
{
if (uMsg == Native.MM_WOM_DONE)
{
try
{
System.Diagnostics.Debug.Assert(dwInstance != IntPtr.Zero);
WinMMAudioRender instance = (WinMMAudioRender)((GCHandle)dwInstance).Target;
System.Diagnostics.Debug.Assert(dwParam1 != IntPtr.Zero);
Native.WAVEHDR hdr = (Native.WAVEHDR)Marshal.PtrToStructure(dwParam1, typeof(Native.WAVEHDR));
System.Diagnostics.Debug.Assert(hdr.dwUser != IntPtr.Zero);
WaveOutBuffer waveOutBuffer = (WaveOutBuffer)((GCHandle)hdr.dwUser).Target;
if (hdr.dwBufferLength > 0)
{
instance._totalDuration += hdr.dwBufferLength;
instance._callback.PlaybackProgress(instance._totalDuration, hdr.dwBufferLength, instance._fmt.nAvgBytesPerSec);
}
// if we are still playing get a new audio buffer
if (instance._started)
{
int length = 0;
if (instance._callback.NextAudioBuffer(waveOutBuffer._data, ref length))
{
System.Diagnostics.Debug.Assert(length <= waveOutBuffer._data.Length);
waveOutBuffer._hdr.dwBufferLength = length;
int result = Native.waveOutWrite(instance._hWaveout, waveOutBuffer._gchHdr.AddrOfPinnedObject(), Marshal.SizeOf(waveOutBuffer._hdr));
System.Diagnostics.Debug.Assert(result == Native.MMSYSERR_NOERROR);
}
else
{
// end of stream read
instance._started = false;
}
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
}
}