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");
}
// the receive thread runs though this loop until told to exit
void ReceiveThreadProc()
{
while (!_exitThread && _recvInstancePtr != IntPtr.Zero)
{
// The descriptors
NDIlib.video_frame_v2_t videoFrame = new NDIlib.video_frame_v2_t();
NDIlib.audio_frame_v2_t audioFrame = new NDIlib.audio_frame_v2_t();
NDIlib.metadata_frame_t metadataFrame = new NDIlib.metadata_frame_t();
switch (NDIlib.recv_capture_v2(_recvInstancePtr, ref videoFrame, ref audioFrame, ref metadataFrame, 1000))
{
// No data
case NDIlib.frame_type_e.frame_type_none:
// No data received
break;
// frame settings - check for extended functionality
case NDIlib.frame_type_e.frame_type_status_change:
// check for PTZ
IsPtz = NDIlib.recv_ptz_is_supported(_recvInstancePtr);
// Check for recording
IsRecordingSupported = NDIlib.recv_recording_is_supported(_recvInstancePtr);
// Check for a web control URL
// We must free this string ptr if we get one.
IntPtr webUrlPtr = NDIlib.recv_get_web_control(_recvInstancePtr);
if (webUrlPtr == IntPtr.Zero)
{
WebControlUrl = String.Empty;
}
else
{
// convert to managed String
WebControlUrl = NDI.UTF.Utf8ToString(webUrlPtr);
// Don't forget to free the string ptr
NDIlib.recv_free_string(_recvInstancePtr, webUrlPtr);
}
break;
// Video data
case NDIlib.frame_type_e.frame_type_video:
// if not enabled, just discard
// this can also occasionally happen when changing sources
if (!_videoEnabled || videoFrame.p_data == IntPtr.Zero)
{
// alreays free received frames
NDIlib.recv_free_video_v2(_recvInstancePtr, ref videoFrame);
break;
}
// get all our info so that we can free the frame
int yres = (int)videoFrame.yres;
int xres = (int)videoFrame.xres;
// quick and dirty aspect ratio correction for non-square pixels - SD 4:3, 16:9, etc.
double dpiX = 96.0 * (((double)xres / (double)yres) / videoFrame.picture_aspect_ratio);
int stride = (int)videoFrame.line_stride_in_bytes;
int bufferSize = yres * stride;
// We need to be on the UI thread to write to our bitmap
// Not very efficient, but this is just an example
Dispatcher.BeginInvoke(new Action(delegate
{
// resize the writeable if needed
if (VideoBitmap == null ||
VideoBitmap.PixelWidth != xres ||
VideoBitmap.PixelHeight != yres ||
Math.Abs(VideoBitmap.DpiX - dpiX) > 0.001)
{
VideoBitmap = null;
GC.Collect(1);
VideoBitmap = new WriteableBitmap(xres, yres, dpiX, 96.0, PixelFormats.Pbgra32, null);
VideoSurface.Source = VideoBitmap;
}
// update the writeable bitmap
VideoBitmap.WritePixels(new Int32Rect(0, 0, xres, yres), videoFrame.p_data, bufferSize, stride);
// free frames that were received AFTER use!
// This writepixels call is dispatched, so we must do it inside this scope.
NDIlib.recv_free_video_v2(_recvInstancePtr, ref videoFrame);
}));
break;
// audio is beyond the scope of this example
case NDIlib.frame_type_e.frame_type_audio:
// if no audio or disabled, nothing to do
if (!_audioEnabled || audioFrame.p_data == IntPtr.Zero || audioFrame.no_samples == 0)
{
// alreays free received frames
NDIlib.recv_free_audio_v2(_recvInstancePtr, ref audioFrame);
break;
}
// if the audio format changed, we need to reconfigure the audio device
bool formatChanged = false;
// make sure our format has been created and matches the incomming audio
if (_waveFormat == null ||
_waveFormat.Channels != audioFrame.no_channels ||
_waveFormat.SampleRate != audioFrame.sample_rate)
{
// Create a wavformat that matches the incomming frames
_waveFormat = WaveFormat.CreateIeeeFloatWaveFormat((int)audioFrame.sample_rate, (int)audioFrame.no_channels);
formatChanged = true;
}
// set up our audio buffer if needed
if (_bufferedProvider == null || formatChanged)
{
_bufferedProvider = new BufferedWaveProvider(_waveFormat);
_bufferedProvider.DiscardOnBufferOverflow = true;
}
// set up our multiplexer used to mix down to 2 output channels)
if (_multiplexProvider == null || formatChanged)
{
_multiplexProvider = new MultiplexingWaveProvider(new List <IWaveProvider>()
{
_bufferedProvider
}, 2);
}
// set up our audio output device
if (_haveAudioDevice && (_wasapiOut == null || formatChanged))
{
try
{
// We can't guarantee audio sync or buffer fill, that's beyond the scope of this example.
// This is close enough to show that audio is received and converted correctly.
_wasapiOut = new WasapiOut(NAudio.CoreAudioApi.AudioClientShareMode.Shared, 50);
_wasapiOut.Init(_multiplexProvider);
_wasapiOut.Volume = _volume;
_wasapiOut.Play();
}
catch
{
// if this fails, assume that there is no audio device on the system
// so that we don't retry/catch on every audio frame received
_haveAudioDevice = false;
}
}
// did we get a device?
if (_haveAudioDevice && _wasapiOut != null)
{
// we're working in bytes, so take the size of a 32 bit sample (float) into account
int sizeInBytes = (int)audioFrame.no_samples * (int)audioFrame.no_channels * sizeof(float);
// NAudio is expecting interleaved audio and NDI uses planar.
// create an interleaved frame and convert from the one we received
NDIlib.audio_frame_interleaved_32f_t interleavedFrame = new NDIlib.audio_frame_interleaved_32f_t()
{
sample_rate = audioFrame.sample_rate,
no_channels = audioFrame.no_channels,
no_samples = audioFrame.no_samples,
timecode = audioFrame.timecode
};
// we need a managed byte array to add to buffered provider
byte[] audBuffer = new byte[sizeInBytes];
// pin the byte[] and get a GC handle to it
// doing it this way saves an expensive Marshal.Alloc/Marshal.Copy/Marshal.Free later
// the data will only be moved once, during the fast interleave step that is required anyway
GCHandle handle = GCHandle.Alloc(audBuffer, GCHandleType.Pinned);
// access it by an IntPtr and use it for our interleaved audio buffer
interleavedFrame.p_data = handle.AddrOfPinnedObject();
// Convert from float planar to float interleaved audio
// There is a matching version of this that converts to interleaved 16 bit audio frames if you need 16 bit
NDIlib.util_audio_to_interleaved_32f_v2(ref audioFrame, ref interleavedFrame);
// release the pin on the byte[]
// never try to access p_data after the byte[] has been unpinned!
// that IntPtr will no longer be valid.
handle.Free();
// push the byte[] buffer into the bufferedProvider for output
_bufferedProvider.AddSamples(audBuffer, 0, sizeInBytes);
}
// free the frame that was received
NDIlib.recv_free_audio_v2(_recvInstancePtr, ref audioFrame);
break;
// Metadata
case NDIlib.frame_type_e.frame_type_metadata:
// UTF-8 strings must be converted for use - length includes the terminating zero
//String metadata = Utf8ToString(metadataFrame.p_data, metadataFrame.length-1);
//System.Diagnostics.Debug.Print(metadata);
// free frames that were received
NDIlib.recv_free_metadata(_recvInstancePtr, ref metadataFrame);
break;
}
}
}
// the receive thread runs though this loop until told to exit
// AccessViolationException
void ReceiveThreadProc()
{
while (!_exitThread && (_recvInstancePtr != IntPtr.Zero))
{
// The descriptors
NDIlib.video_frame_v2_t videoFrame = new NDIlib.video_frame_v2_t();
NDIlib.audio_frame_v2_t audioFrame = new NDIlib.audio_frame_v2_t();
NDIlib.metadata_frame_t metadataFrame = new NDIlib.metadata_frame_t();
switch (NDIlib.recv_capture_v2(_recvInstancePtr, ref videoFrame, ref audioFrame, ref metadataFrame, 1000))
{
// No data
case NDIlib.frame_type_e.frame_type_none:
// No data received
break;
// frame settings - check for extended functionality
case NDIlib.frame_type_e.frame_type_status_change:
// 何もしない
break;
// Video data
case NDIlib.frame_type_e.frame_type_video:
// if not enabled, just discard
// this can also occasionally happen when changing sources
if (_videoEnabled == false || videoFrame.p_data == IntPtr.Zero)
{
// alreays free received frames
NDIlib.recv_free_video_v2(_recvInstancePtr, ref videoFrame);
break;
}
// get all our info so that we can free the frame
int yres = (int)videoFrame.yres;
int xres = (int)videoFrame.xres;
// quick and dirty aspect ratio correction for non-square pixels - SD 4:3, 16:9, etc.
//double dpiX = 96.0 * ((double)videoFrame.picture_aspect_ratio / ((double)xres / (double)yres));
int stride = (int)videoFrame.line_stride_in_bytes;
int bufferSize = yres * stride;
// We need to be on the UI thread to write to our bitmap
// Not very efficient, but this is just an example
Dispatcher.BeginInvoke(new Action(delegate
{
if (_videoEnabled == false)
{
return;
}
// resize the writeable if needed
if (VideoBitmap == null ||
VideoBitmap.PixelWidth != xres ||
VideoBitmap.PixelHeight != yres)
{
VideoBitmap = new WriteableBitmap(xres, yres, 96.0, 96.0, PixelFormats.Pbgra32, null);
VideoSurface.Source = VideoBitmap;
}
try
{
VideoBitmap.Lock();
IntPtr pBackBuffer = VideoBitmap.BackBuffer;
try
{
CopyMemory(pBackBuffer, videoFrame.p_data, (uint)bufferSize);
}
catch
{
return;
}
// Specify the area of the bitmap that changed.
VideoBitmap.AddDirtyRect(new Int32Rect(0, 0, xres, yres));
}
finally
{
VideoBitmap.Unlock();
}
// free frames that were received AFTER use!
// This writepixels call is dispatched, so we must do it inside this scope.
NDIlib.recv_free_video_v2(_recvInstancePtr, ref videoFrame);
}));
#if DEBUG
// フレームレートを計算
DateTime now = DateTime.Now;
TimeSpan dist = now - last;
if (dist.Seconds > 0)
{
Console.WriteLine("フレームレート：<1");
}
else
{
if (dist.Milliseconds == 0)
{
Console.WriteLine("フレームレート：∞");
}
else
{
int frame = 1000 / dist.Milliseconds;
Console.WriteLine("フレームレート：{0}", frame.ToString());
}
}
last = now;
#endif
break;
case NDIlib.frame_type_e.frame_type_audio:
// 何もしない
// ここで解放しておかないとメモリの中に残るので注意
NDIlib.recv_free_audio_v2(_recvInstancePtr, ref audioFrame);
break;
case NDIlib.frame_type_e.frame_type_metadata:
// 何もしない
NDIlib.recv_free_metadata(_recvInstancePtr, ref metadataFrame);
break;
}
}
}
