public override bool RemoveCapability(ICapability capability)
{
bool ret = base.RemoveCapability(capability);
if (ret)
{
if (fgm != null)
{
fgm.Stop();
FilterGraph.RemoveFromRot(rotID);
FilterGraph.RemoveAllFilters(fgm);
fgm = null;
}
if (fgmEventMonitor != null)
{
fgmEventMonitor.FgmEvent -= new FgmEventMonitor.FgmEventHandler(FgmEvent);
fgmEventMonitor.Dispose();
fgmEventMonitor = null;
}
wmf = null;
}
return(ret);
}
/// <summary>
/// Creates and initializes the Fgm, retrieves interfaces from it, starts the monitoring
/// thread etc. the first time. Stops it subsequent times.
/// </summary>
private void InitializeFgm()
{
if (fgm == null)
{
fgm = new FilgraphManagerClass();
iGB = (IGraphBuilder)fgm;
iCGB2 = MDShow.CaptureGraphBuilder2Class.CreateInstance();
iCGB2.SetFiltergraph(iGB);
rotID = FilterGraph.AddToRot(iGB);
// Initialize class that will monitor events on the fgm
fgmEventMonitor = new FgmEventMonitor((IMediaEvent)fgm);
fgmEventMonitor.FgmEvent += new FgmEventMonitor.FgmEventHandler(FgmEvent);
}
else
{
fgm.Stop();
}
}
/// <summary>
/// The callback method once the file is done playing.
///
/// Important: This method is called from a non-UI thread. Due to COM rules, the fgm,
/// its interfaces, filters, etc. are not really accessible from this thread. One solution
/// is to use this.Invoke in order to get execution back onto the UI thread (example below).
/// The alternative approach is to have the thread(s) created in the MTA (multithreaded
/// apartment). This is most easily accomplished by changing the STAThreaded attribute in
/// Form.Main to use MTAThreaded.
///
/// Parameters are unused but available due to the paradigm
/// </summary>
private void FgmEvent(object sender, FgmEventMonitor.FgmEventArgs ea)
{
switch (ea.EventCode)
{
case 1: // EC_COMPLETE
{
// If MTAThread set on Form.Main, no need to Invoke
// FileFinished();
if (InvokeRequired)
{
// Manipulate all DShow and COM objects from UI thread
// Should always take this path during the callback
Invoke(new MethodInvoker(FileFinished), null);
}
else // STA && InvokeRequired
{
FileFinished();
}
break;
}
// Besides EC_COMPLETE, these are the only other events I have seen fire
case 0x0D: // EC_CLOCK_CHANGED
case 0x0E: // EC_PAUSED
break;
default:
{
Console.WriteLine("EventCode: {0}, Param1: {1}, Param2: {2}",
ea.EventCode, ea.Param1, ea.Param2);
break;
}
}
}
/// <summary>
/// Creates and initializes the Fgm, retrieves interfaces from it, starts the monitoring
/// thread etc. the first time. Stops it subsequent times.
/// </summary>
private void InitializeFgm()
{
if (fgm == null)
{
fgm = new FilgraphManagerClass();
iGB = (IGraphBuilder)fgm;
iCGB2 = MDShow.CaptureGraphBuilder2Class.CreateInstance();
iCGB2.SetFiltergraph(iGB);
rotID = FilterGraph.AddToRot(iGB);
// Initialize class that will monitor events on the fgm
fgmEventMonitor = new FgmEventMonitor((IMediaEvent)fgm);
fgmEventMonitor.FgmEvent += new FgmEventMonitor.FgmEventHandler(FgmEvent);
}
else
{
fgm.Stop();
}
}
public override bool RemoveCapability(ICapability capability)
{
bool ret = base.RemoveCapability(capability);
if (ret)
{
if (fgm != null)
{
fgm.Stop();
FilterGraph.RemoveFromRot(rotID);
FilterGraph.RemoveAllFilters(fgm);
fgm = null;
}
if (fgmEventMonitor != null)
{
fgmEventMonitor.FgmEvent -= new FgmEventMonitor.FgmEventHandler(FgmEvent);
fgmEventMonitor.Dispose();
fgmEventMonitor = null;
}
wmf = null;
}
return ret;
}
