private void ReceiveThreadProc()
{
var recvInstance = _ndiReceiveInstance;
if (recvInstance == IntPtr.Zero)
{
return;
}
while (!_exitReceiveThread)
{
NDIlib_video_frame_t videoFrame = new NDIlib_video_frame_t();
NDIlib_audio_frame_t audioFrame = new NDIlib_audio_frame_t();
NDIlib_metadata_frame_t metadataFrame = new NDIlib_metadata_frame_t();
switch (Ndi.NDIlib_recv_capture(recvInstance, ref videoFrame, ref audioFrame, ref metadataFrame, 1000))
{
case NDIlib_frame_type_e.NDIlib_frame_type_video:
if (videoFrame.p_data == IntPtr.Zero)
{
Ndi.NDIlib_recv_free_video(recvInstance, ref videoFrame);
break;
}
int yres = (int)videoFrame.yres;
int xres = (int)videoFrame.xres;
double dpiY = 96.0 * (videoFrame.picture_aspect_ratio / ((double)xres / yres));
int stride = (int)videoFrame.line_stride_in_bytes;
int bufferSize = yres * stride;
Application.Current?.Dispatcher.BeginInvoke(new Action(delegate
{
if (VideoBitmap == null ||
VideoBitmap.PixelWidth != xres ||
VideoBitmap.PixelHeight != yres)
{
VideoBitmap = new WriteableBitmap(xres, yres, 96, dpiY, System.Windows.Media.PixelFormats.Pbgra32, null);
}
// update the writeable bitmap
VideoBitmap.Lock();
VideoBitmap.WritePixels(new Int32Rect(0, 0, xres, yres), videoFrame.p_data, bufferSize, stride);
VideoBitmap.Unlock();
Ndi.NDIlib_recv_free_video(recvInstance, ref videoFrame);
}));
break;
case NDIlib_frame_type_e.NDIlib_frame_type_audio:
Ndi.NDIlib_recv_free_audio(recvInstance, ref audioFrame);
break;
case NDIlib_frame_type_e.NDIlib_frame_type_metadata:
Ndi.NDIlib_recv_free_metadata(recvInstance, ref metadataFrame);
break;
}
}
Debug.WriteLine(this, "Receive thread exited");
}
