/// <summary>
/// Stops a capture.
/// </summary>
/// <exception cref="InvalidOperationException">The control is not capturing a video stream.</exception>
/// <exception cref="DirectShowException">Failed to stop a video capture graph.</exception>
public void StopCapture()
{
if (!IsCapturing)
{
throw new InvalidOperationException();
}
Proxy.Stop();
IsCapturing = false;
Proxy.ResetCaptureGraph();
_currentCamera = null;
}
/// <summary>
/// Starts a capture.
/// </summary>
/// <param name="camera">The camera to capture from.</param>
/// <exception cref="ArgumentNullException">A null reference is passed as an argument.</exception>
/// <exception cref="Win32Exception">Failed to load the DirectShow utilities dll.</exception>
/// <exception cref="DirectShowException">Failed to run a video capture graph.</exception>
public void StartCapture(WebCameraId camera)
{
if (camera == null)
{
throw new ArgumentNullException();
}
if (!_captureGraphInitialized)
{
InitializeCaptureGraph();
_captureGraphInitialized = true;
}
if (IsCapturing)
{
if (_currentCamera == camera)
{
return;
}
StopCapture();
}
if (_currentCamera != null)
{
Proxy.ResetCaptureGraph();
_currentCamera = null;
}
Proxy.AddCaptureFilter(camera.DevicePath);
_currentCamera = camera;
try
{
Proxy.Start();
IsCapturing = true;
}
catch (DirectShowException)
{
Proxy.ResetCaptureGraph();
_currentCamera = null;
throw;
}
}