private static void HandleZoomAndFocus(DateTime nextEventTime, WebClient wc, CameraDefinition cam, string zoom, string focus)
{
double dbl;
bool SetZoom = !string.IsNullOrWhiteSpace(zoom) && double.TryParse(zoom, out dbl);
bool FocusIsEmpty = string.IsNullOrWhiteSpace(focus);
bool ManualFocus = FocusIsEmpty ? false : double.TryParse(focus, out dbl);
// There are 4 cases
if (SetZoom)
{
if (ManualFocus)
{
// Case 1: Manual Zoom, Manual Focus
Thread.Sleep(3000);
// Do this in a loop, because Dahua's API is buggy.
// Often, the first command causes only focus to happen.
// The second typically causes zoom and autofocus.
// The third or fourth usually causes our manual focus level to be set.
for (int i = 0; i < 5; i++)
{
WebRequestRobust(nextEventTime, wc, cam.GetUrlBase() + "cgi-bin/devVideoInput.cgi?action=adjustFocus&focus=" + focus + "&zoom=" + zoom);
Thread.Sleep(Math.Max(1, cam.secondsBetweenLensCommands) * 1000);
}
}
else
{
// Case 2: Manual Zoom, Autofocus
focus = zoom;
Thread.Sleep(3000);
// Do this in a loop, because Dahua's API is buggy.
// Often, the first command causes only focus to happen.
// The second typically causes zoom and autofocus.
// The third or fourth usually causes our manual focus level to be set.
for (int i = 0; i < 4; i++)
{
WebRequestRobust(nextEventTime, wc, cam.GetUrlBase() + "cgi-bin/devVideoInput.cgi?action=adjustFocus&focus=" + focus + "&zoom=" + zoom);
Thread.Sleep(Math.Max(1, cam.secondsBetweenLensCommands) * 1000);
}
// This method has been, in my experience, reliable enough to call only once.
WebRequestRobust(nextEventTime, wc, cam.GetUrlBase() + "cgi-bin/devVideoInput.cgi?action=autoFocus");
}
}
else
{
if (FocusIsEmpty || ManualFocus)
{
// Case 4: Don't zoom and don't focus. Do nothing.
}
else
{
// Case 3: Autofocus Only
// This method has been, in my experience, reliable enough to call only once.
WebRequestRobust(nextEventTime, wc, cam.GetUrlBase() + "cgi-bin/devVideoInput.cgi?action=autoFocus");
}
}
}
