public void StartCapture()
{
//Setup specific Device
try
{
//lets be cautious with VIW
//Check to see if ID is valid first.
int num = VIWrapper.ListDevices();
if (deviceId < num)
{
VIWrapper.SetRequestedMediaSubType(mediaSubtype);
VIWrapper.SetFormat(deviceId, formatType);
VIWrapper.SetupDevice1(deviceId, physicalType);
VIWrapper.SetIdealFramerate(deviceId, idealFrameRate);
//Start the capture thread
captureThread = new Thread(new ParameterizedThreadStart(_capThread));
captureThread.Name = "CaptureThread";
captureThread.IsBackground = true;
isCaptureRunning = true;
captureThread.Start(deviceId);
}
}
catch (Exception e)
{
Console.WriteLine("Exception occured while trying to start video capture. \n" + e);
}
//Turn on capture thread
}
public void RefreshList()
{
DeviceList.Clear();
numDevices = VIWrapper.ListDevices();
for (int i = 0; i < numDevices; i++)
{
DeviceList.Add(VIWrapper.GetDeviceName(i));
}
}
public void RefreshList()
{
DeviceList.Clear();
numDevices = VIWrapper.ListDevices();
for (int i = 0; i < numDevices; i++)
{
DeviceList.Add(VIWrapper.GetDeviceName(i));
}
OnPropertyChanged("DeviceID");
OnPropertyChanged("DeviceList");
}
/// <summary>
/// Starts capturing the selected device.
/// </summary>
public void StartCapture()
{
Console.WriteLine("Starting Capture");
if (capThread != null)
{
capThread.Abort();
}
VIWrapper.SetupDevice(selectedDeviceIndex);
keepGoing = true;
capThread = new Thread(new ParameterizedThreadStart(_captureThread));
capThread.Start(selectedDeviceIndex);
}
public void StopCapture()
{
try
{
LatencyTesterVM.Instance.KillPreview();
isCaptureRunning = false;
while (captureThread.IsAlive) //let the thread go peacefully.
{
Thread.Sleep(5);
}
Console.WriteLine("Shutting Down");
VIWrapper.StopDevice(DeviceID);
}
catch (Exception)
{ }
}
private void _captureThread(object devIdf)
{
int devId = (int)devIdf;
while (keepGoing)
{
FrameRate = CalculateFrameRate();
Thread.Sleep(1);
if (VIWrapper.IsFrameReady(selectedDeviceIndex))
{
//
// writeLock = true;
output = IntPtr.Zero;
VIWrapper.GetImage(devId, ref output, false, true);
writeLock = false;
int width = VIWrapper.GetWidth(devId);
int height = VIWrapper.GetHeight(devId);
try
{
Application.Current.Dispatcher.BeginInvoke(
DispatcherPriority.Background,
new Action(() =>
{
CapturedImage = FromNativePointer(output, width, height, 3);
}));
if (this.runTest)
{
Stopwatch sw = new Stopwatch();
sw.Start();
if (CheckIfRed(this.redThreshold, array, width, height, 3))
{
redDetected.Stop();
EndLatencyTest();
}
sw.Stop();
// Console.WriteLine("It took " + sw.ElapsedTicks + " to run or" + sw.ElapsedMilliseconds + " Ms");
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
}
}
private void _capThread(object deviceID)
{
int devId = (int)deviceID;
while (isCaptureRunning)
{
UpdateFrameRate(); //update the framerate.
Thread.Sleep(1);
if (isCaptureRunning && VIWrapper.IsFrameReady(devId))
{
unmanagedImagePtr = IntPtr.Zero; // Clean the pointer!
try //Enter exception safetyland!
{
VIWrapper.GetImage(devId, ref unmanagedImagePtr, false, true);
//Update Width and Height - Probably not necessary after capture starts. Move to StartCapture!
ImageWidth = VIWrapper.GetWidth(devId);
ImageHeight = VIWrapper.GetHeight(devId);
int bytesPerPixel = 3; //NOTE:Assumption of RGB24 starts here!
lock (bufferGuard) /* Enter critical section to copy data into buffer */
{
if (unmanagedImagePtr != IntPtr.Zero)
{
unsafe
{
Marshal.Copy(unmanagedImagePtr, buffer1, 0, (imageWidth * imageHeight * bytesPerPixel));
}
}
}
// Marshal.FreeHGlobal(unmanagedImagePtr); //Free the data since it should be managed.
GC.Collect(); //Enforced GC because 60frames passes a TON of data
//Now, call back registered members!
//Maybe Lock each call?? If i get crashes, try that.
foreach (Func <byte[], int> function in _callbackMethods)
{
Application.Current.Dispatcher.BeginInvoke(
DispatcherPriority.Loaded,
new Action(() =>
{
try
{
function(buffer1);
}
catch (Exception e)
{ }
}));
}
}
catch (Exception e)
{
Console.WriteLine("CAPTURE FAILURE please report to dev!. Exception -->" + e);
Console.WriteLine("Exception Source: " + e.Source);
Console.WriteLine("Stack Trace:" + e.StackTrace);
}
}
}
}
