// 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;
}
}
}
private void AudioCap_DataAvailable(object sender, WaveInEventArgs e)
{
if (isPausedValue || sendInstancePtr == IntPtr.Zero)
{
return;
}
// how many samples?
int numSamples = (e.BytesRecorded / (audioNumChannels * audioSampleSizeInBytes));
// how much float buffer will this need?
int bufferSizeNeeded = numSamples * audioNumChannels * sizeof(float);
// is our audio frame big enough? too big is fine
if (audioBufferSize < bufferSizeNeeded || audioFrame.p_data == IntPtr.Zero)
{
if (audioFrame.p_data != null)
{
Marshal.FreeHGlobal(audioFrame.p_data);
audioFrame.p_data = IntPtr.Zero;
}
audioFrame.p_data = Marshal.AllocHGlobal(bufferSizeNeeded);
audioBufferSize = bufferSizeNeeded;
}
// set these every time because why not?
audioFrame.sample_rate = audioSampleRate;
audioFrame.no_channels = audioNumChannels;
audioFrame.no_samples = numSamples;
// pin the byte[] audio received and get a GC handle to it
GCHandle interleavedHandle = GCHandle.Alloc(e.Buffer, GCHandleType.Pinned);
if (audioSampleSizeInBytes == 2)
{
// make an temporary interleaved NDI audio frame around the received samples
NDIlib.audio_frame_interleaved_16s_t interleavedShortFrame = new NDIlib.audio_frame_interleaved_16s_t()
{
sample_rate = audioSampleRate,
no_channels = audioNumChannels,
no_samples = numSamples,
p_data = interleavedHandle.AddrOfPinnedObject()
};
// Convert from s16 interleaved to float planar audio
NDIlib.util_audio_from_interleaved_16s_v2(ref interleavedShortFrame, ref audioFrame);
}
else if (audioSampleSizeInBytes == 4)
{
// make an temporary interleaved NDI audio frame around the received samples
NDIlib.audio_frame_interleaved_32f_t interleavedFloatFrame = new NDIlib.audio_frame_interleaved_32f_t()
{
sample_rate = audioSampleRate,
no_channels = audioNumChannels,
no_samples = numSamples,
p_data = interleavedHandle.AddrOfPinnedObject()
};
// Convert from float interleaved to float planar audio
NDIlib.util_audio_from_interleaved_32f_v2(ref interleavedFloatFrame, ref audioFrame);
}
else
{
System.Diagnostics.Debug.Assert(false, "Unexpected audio sample size.");
}
// release the GC pinning of the byte[]'s
interleavedHandle.Free();
Monitor.Enter(sendInstanceLock);
// send the planar frame
if (sendInstancePtr != IntPtr.Zero)
{
if (!IsSendPaused)
{
NDIlib.send_send_audio_v2(sendInstancePtr, ref audioFrame);
}
}
Monitor.Exit(sendInstanceLock);
}
// 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 = 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 * (videoFrame.picture_aspect_ratio / ((double)xres / (double)yres));
int stride = (int)videoFrame.line_stride_in_bytes;
int bufferSize = yres * stride;
if (bufferSize != buffer01Size)
{
buffer0 = Marshal.ReAllocCoTaskMem(buffer0, bufferSize);
buffer1 = Marshal.ReAllocCoTaskMem(buffer1, bufferSize);
buffer01Size = bufferSize;
}
// Copy data
unsafe
{
byte *dst = (byte *)buffer0.ToPointer();
byte *src = (byte *)videoFrame.p_data.ToPointer();
for (int y = 0; y < yres; y++)
{
memcpy(dst, src, stride);
dst += stride;
src += stride;
}
}
// swap
IntPtr temp = buffer0;
buffer0 = buffer1;
buffer1 = temp;
ImagingPixelFormat pixFmt;
switch (videoFrame.FourCC)
{
case NDIlib.FourCC_type_e.FourCC_type_BGRA:
pixFmt = PixelFormat.B8G8R8A8; break;
case NDIlib.FourCC_type_e.FourCC_type_BGRX:
pixFmt = PixelFormat.B8G8R8; break;
case NDIlib.FourCC_type_e.FourCC_type_RGBA:
pixFmt = PixelFormat.R8G8B8A8; break;
case NDIlib.FourCC_type_e.FourCC_type_RGBX:
pixFmt = PixelFormat.R8G8B8; break;
default:
pixFmt = PixelFormat.Unknown; // TODO: need to handle other video formats which are currently unsupported by IImage
break;
}
var VideoFrameImage = buffer1.ToImage(bufferSize, xres, yres, pixFmt, videoFrame.FourCC.ToString());
videoFrames.OnNext(VideoFrameImage);
// 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;
}
// 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();
int channelStride = audioFrame.channel_stride_in_bytes;
var floatBuffer = ConvertByteArrayToFloat(audBuffer, channelStride);
float[] outBuffer = new float[512];
Buffer.BlockCopy(floatBuffer, 0, outBuffer, 0, 512);
audioOutSignal.Read(outBuffer, 0, 512);
// 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;
}
}
}
/// <summary>
/// the receive thread runs though this loop until told to exit
/// </summary>
void ReceiveThreadProc()
{
bool newVideo = true;
using var deviceHandle = deviceProvider.GetHandle();
var device = deviceHandle.Resource;
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 = 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 * (videoFrame.picture_aspect_ratio / ((double)xres / (double)yres));
int stride = (int)videoFrame.line_stride_in_bytes;
int bufferSize = yres * stride;
if (bufferSize != buffer01Size)
{
buffer0 = Marshal.ReAllocCoTaskMem(buffer0, bufferSize);
buffer1 = Marshal.ReAllocCoTaskMem(buffer1, bufferSize);
buffer01Size = bufferSize;
}
// Copy data
unsafe
{
byte *dst = (byte *)buffer0.ToPointer();
byte *src = (byte *)videoFrame.p_data.ToPointer();
for (int y = 0; y < yres; y++)
{
memcpy(dst, src, stride);
dst += stride;
src += stride;
}
}
// swap
IntPtr temp = buffer0;
buffer0 = buffer1;
buffer1 = temp;
SharpDX.DXGI.Format texFmt;
switch (videoFrame.FourCC)
{
case NDIlib.FourCC_type_e.FourCC_type_BGRA:
texFmt = SharpDX.DXGI.Format.B8G8R8A8_UNorm;
break;
case NDIlib.FourCC_type_e.FourCC_type_BGRX:
texFmt = SharpDX.DXGI.Format.B8G8R8A8_UNorm;
break;
case NDIlib.FourCC_type_e.FourCC_type_RGBA:
texFmt = SharpDX.DXGI.Format.R8G8B8A8_UNorm;
break;
case NDIlib.FourCC_type_e.FourCC_type_RGBX:
texFmt = SharpDX.DXGI.Format.B8G8R8A8_UNorm;
break;
default:
texFmt = SharpDX.DXGI.Format.Unknown; // TODO: need to handle other video formats
break;
}
if (newVideo) // it's the first time we enter the while loop, so cerate a new texture
{
textureDesc = new Texture2DDescription()
{
Width = xres,
Height = yres,
MipLevels = 1,
ArraySize = 1,
Format = texFmt,
SampleDescription = new SharpDX.DXGI.SampleDescription(1, 0),
Usage = ResourceUsage.Default,
BindFlags = BindFlags.ShaderResource,
CpuAccessFlags = CpuAccessFlags.None,
OptionFlags = ResourceOptionFlags.None
};
outputTexture = new Texture2D(device, textureDesc);
newVideo = false;
}
try
{
DataBox srcBox = new DataBox(buffer1);
device.ImmediateContext.UpdateSubresource(srcBox, outputTexture, 0);
videoFrames.OnNext(outputTexture);
}
finally
{
device.ImmediateContext.UnmapSubresource(outputTexture, 0);
}
// 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 (_wasapiOut == null || formatChanged)
// {
// // 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();
// }
// 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;
}
}
}
