void ReleaseSenderObjects()
{
// Total synchronization: This may cause a frame hiccup, but it's
// needed to dispose the readback buffers safely.
AsyncGPUReadback.WaitAllRequests();
// Game view capture method: Leave the sender instance without
// disposing (we're not the owner) but synchronize it. It's needed to
// dispose the readback buffers safely too.
if (SharedInstance.IsGameViewSend(_send))
{
_send.SendVideoAsync(); // Sync by null-send
_send = null;
}
// Private objet disposal
_send?.Dispose();
_send = null;
_pool?.Dispose();
_pool = null;
_converter?.Dispose();
_converter = null;
// We don't dispose _onReadback because it's reusable.
}
unsafe void OnReadback(AsyncGPUReadbackRequest request)
{
// Metadata retrieval
using (var metadata = _metadataQueue.Dequeue())
{
// Ignore errors.
if (request.hasError)
{
return;
}
// Ignore it if the NDI object has been already disposed.
if (_send == null || _send.IsInvalid || _send.IsClosed)
{
return;
}
// Pixel format (depending on alpha mode)
var fourcc = _enableAlpha ?
Interop.FourCC.UYVA : Interop.FourCC.UYVY;
// Readback data retrieval
var data = request.GetData <byte>();
var pdata = NativeArrayUnsafeUtility.GetUnsafeReadOnlyPtr(data);
// Data size verification
if (data.Length / sizeof(uint) !=
Util.FrameDataCount(_width, _height, _enableAlpha))
{
return;
}
// Frame data setup
var frame = new Interop.VideoFrame
{
Width = _width, Height = _height, LineStride = _width * 2,
FourCC = _enableAlpha ?
Interop.FourCC.UYVA : Interop.FourCC.UYVY,
FrameFormat = Interop.FrameFormat.Progressive,
Data = (System.IntPtr)pdata, Metadata = metadata
};
// Send via NDI
_send.SendVideoAsync(frame);
}
}
unsafe void OnReadback(AsyncGPUReadbackRequest request)
{
// Metadata retrieval
using (var metadata = _metadataQueue.Dequeue())
{
// Ignore errors.
if (request.hasError)
{
return;
}
// Ignore it if the NDI object has been already disposed.
if (_send == null || _send.IsInvalid || _send.IsClosed || !_enableVideoFrames)
{
return;
}
// Pixel format (depending on alpha mode)
var fourcc = _enableAlpha ?
Interop.FourCC.UYVA : Interop.FourCC.UYVY;
// Readback data retrieval
var data = request.GetData <byte>();
// NDI SDK Documentation p.21 re: send_video_v2_async
//
// If you call this and then free the pointer, your application will
// most likely crash in an NDI thread because the SDK is still using the video frame
// that was passed to the call.
// One possible solution is to ping pong between two buffers on
// alternating calls to NDIlib_send_send_video_v2_async
if (data.Length <= 0)
{
return;
}
if (videoFrameBuffer1 == null || videoFrameBuffer1.Length <= 0)
{
videoFrameBuffer1 = new byte[data.Length];
bufferHandle1 = GCHandle.Alloc(videoFrameBuffer1, GCHandleType.Pinned);
}
if (videoFrameBuffer2 == null || videoFrameBuffer2.Length <= 0)
{
videoFrameBuffer2 = new byte[data.Length];
bufferHandle2 = GCHandle.Alloc(videoFrameBuffer2, GCHandleType.Pinned);
}
// Handle frame size change
if (videoFrameBuffer1.Length != data.Length)
{
_send.SendVideoAsync(emptyVideoFrame);
bufferHandle1.Free();
videoFrameBuffer1 = new byte[data.Length];
bufferHandle1 = GCHandle.Alloc(videoFrameBuffer1, GCHandleType.Pinned);
}
if (videoFrameBuffer2.Length != data.Length)
{
_send.SendVideoAsync(emptyVideoFrame);
bufferHandle2.Free();
videoFrameBuffer2 = new byte[data.Length];
bufferHandle2 = GCHandle.Alloc(videoFrameBuffer2, GCHandleType.Pinned);
}
// Ping pong handles
var pdata = ping == 0 ? bufferHandle1.AddrOfPinnedObject() : bufferHandle2.AddrOfPinnedObject();
data.CopyTo(ping == 0 ? videoFrameBuffer1 : videoFrameBuffer2);
ping = ping == 0 ? 1 : 0;
// Data size verification
if (data.Length / sizeof(uint) !=
Util.FrameDataCount(_width, _height, _enableAlpha))
{
return;
}
// Frame data setup
var frame = new Interop.VideoFrame
{
Width = _width, Height = _height, LineStride = _width * 2,
FrameRateN = (int)frameRateND.x,
FrameRateD = (int)frameRateND.y,
FourCC = _enableAlpha ?
Interop.FourCC.UYVA : Interop.FourCC.UYVY,
FrameFormat = Interop.FrameFormat.Progressive,
Data = (System.IntPtr)pdata, Metadata = metadata
};
// Send via NDI
_send.SendVideoAsync(frame);
if (metadata != IntPtr.Zero)
{
_onVideoMetadataSent?.Invoke();
}
}
}
