void Update()
{
// attempt to reinitialize if connection was lost last frame or is not present on start
if (cameraState == CameraState.disconnected || lastError < 0)
{
bool initialized = Initialize();
if (!initialized)
{
return;
}
}
// this is the main call to the dll that does the face detection processing on an OpenCV frame
// it returns the data needed to build output in Unity
cvFrame = GetFaceDetectionResults();
//Debug.LogFormat("from frame, x = {0}, y = {1}, bufferSize = {2}, memPtr = {3}, error = {4}", cvFrame.x, cvFrame.y, cvFrame.bufferSize, cvFrame.memPtr, cvFrame.error);
// handle error cases returend by dll; i.e. disconnected usb device
if (cvFrame.error < 0)
{
//Debug.LogFormat("RunFaceDetection returned error {0}", cvFrame.error);
OpenCVInterop.Close();
cameraState = CameraState.disconnected;
lastError = cvFrame.error; // so we know to reinitialize rather than run demo next frame
return;
}
// create array, marshal data from pointer, output, then free the pointer
byte[] bytes = new byte[cvFrame.bufferSize];
Marshal.Copy(cvFrame.memPtr, bytes, 0, cvFrame.bufferSize);
OutputFrame(cvFrame, bytes);
OpenCVInterop.FreeMemory();
}