void PollAttachedDeviceChanges()
{
// check to see if the user attached a device or removed a device
// this is also how we find devices attached at start up
TimeSpan frameTimeOut = new TimeSpan(0, 0, 1);
S2255Device DeviceToRemoveFromList = null;
while (!m_StopThreads)
{
int attachedCount = GetNumberAttached2255Devices();
if (attachedCount < GetOpenDeviceCount())
{
DeviceToRemoveFromList = null;
// we lost a device, but which one?
// look for one with no video frames comming
foreach (S2255Device dev in m_S2255Devices)
{
if (DateTime.Now.Subtract(frameTimeOut).CompareTo(dev.TimeAtLastFrame) > 0)
{
// this is the lost device, close the physical device and release the controller instance, and release the device index
CloseDevice(dev);
DeviceToRemoveFromList = dev;
break;
}
}
if (DeviceToRemoveFromList != null)
{
m_S2255Devices.Remove(DeviceToRemoveFromList);
}
}
else if (attachedCount > GetOpenDeviceCount() && GetOpenDeviceCount() < MAX_S2255DEVICE_COUNT)
{
// we gained one, try to find its assigned index by trial and error
for (int d = 0; d < MAX_2255DEVICE_HANDLE_VALUE; d++)
{
int handleToTry = m_DeviceHandlePool.GetNextOpenDeviceValue();
if (S2255Device.TestOpenDevice(handleToTry))
{
// we found a new device at this index
int index = m_UsedDeviceIndexes.GetNextOpenDeviceValue();
S2255Device dev = CreateAndStartNew2255(index, handleToTry); // reserves the device index, starts video flowing into the system
m_S2255Devices.Add(dev);
break;
}
}
}
if (m_StopThreads)
{
break;
}
Thread.Sleep(2000);
}
}
void CloseDevice(S2255Device dev)
{
m_Log.Log("stopped 2255 FrameGrabber at index " + dev.DeviceIndex.ToString(), ErrorLog.LOG_TYPE.INFORMATIONAL);
dev.CloseDevice();
m_UsedDeviceIndexes.ReleaseValue(dev.DeviceIndex); // free this index
m_DeviceHandlePool.ReleaseValue(dev.DeviceHandle); // free the handle
// this indicator does not really tell you which device is lost, only that a device is lost. the user will see one or two device present indicators,
// but no indication of which device is there
if (GetOpenDeviceCount() == 1)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_2].StatString.SetValue = "No Device";
}
else if (GetOpenDeviceCount() == 0)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_1].StatString.SetValue = "No Device";
}
}
S2255Device CreateAndStartNew2255(int index, int handle)
{
string[] chanNames = null;
bool[] configedchannels = GetConfiguredChannels(out chanNames);
S2255Device device = new S2255Device(index, handle, m_AppData, m_VideoStandard, m_S2255DevicePortChannelMappsings[index]);
device.SetSourceNames(chanNames);
device.State = S2255Device.DEVICE_STATE.CLOSED;
device.Model = S2255Device.DEVICE_MODEL.S2255;
device.UserConfigured = true;
for (int c = 0; c < m_AppData.MAX_PHYSICAL_CHANNELS; c++)
{
device.RegisterToReceiveFrames(c, OnNewFrameFromDevice);
}
device.OpenDevice();
m_Log.Log("started 2255 FrameGrabber at handle " + handle.ToString(), ErrorLog.LOG_TYPE.INFORMATIONAL);
m_DeviceHandlePool.MarkValueAsUsed(handle);
m_UsedDeviceIndexes.MarkValueAsUsed(index);
if (GetOpenDeviceCount() == 2)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_2].StatString.SetValue = "Have Device";
}
else if (GetOpenDeviceCount() == 1)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_1].StatString.SetValue = "Have Device";
}
return(device);
}
S2255Device CreateAndStartNew2255( int index, int handle)
{
string[] chanNames = null;
bool[] configedchannels = GetConfiguredChannels(out chanNames);
S2255Device device = new S2255Device(index, handle, m_AppData, m_VideoStandard, m_S2255DevicePortChannelMappsings[index]);
device.SetSourceNames(chanNames);
device.State = S2255Device.DEVICE_STATE.CLOSED;
device.Model = S2255Device.DEVICE_MODEL.S2255;
device.UserConfigured = true;
for (int c = 0; c < m_AppData.MAX_PHYSICAL_CHANNELS; c++)
{
device.RegisterToReceiveFrames(c, OnNewFrameFromDevice);
}
device.OpenDevice();
m_Log.Log("started 2255 FrameGrabber at handle " + handle.ToString(), ErrorLog.LOG_TYPE.INFORMATIONAL);
m_DeviceHandlePool.MarkValueAsUsed(handle);
m_UsedDeviceIndexes.MarkValueAsUsed(index);
if (GetOpenDeviceCount() == 2)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_2].StatString.SetValue = "Have Device";
}
else if (GetOpenDeviceCount() == 1)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_1].StatString.SetValue = "Have Device";
}
return (device);
}
void CloseDevice( S2255Device dev)
{
m_Log.Log("stopped 2255 FrameGrabber at index " + dev.DeviceIndex.ToString(), ErrorLog.LOG_TYPE.INFORMATIONAL);
dev.CloseDevice();
m_UsedDeviceIndexes.ReleaseValue(dev.DeviceIndex); // free this index
m_DeviceHandlePool.ReleaseValue(dev.DeviceHandle);// free the handle
// this indicator does not really tell you which device is lost, only that a device is lost. the user will see one or two device present indicators,
// but no indication of which device is there
if (GetOpenDeviceCount() == 1)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_2].StatString.SetValue = "No Device";
}
else if (GetOpenDeviceCount() == 0)
{
m_AppData.HealthStatistics[(int)APPLICATION_DATA.HEALTH_STATISTICS.System.System_frameGrabber_1].StatString.SetValue = "No Device";
}
}