CodeTV.GraphBuilderWDM.GetControlInterface C# (CSharp) Method

        private void GetControlInterface()
        {
            this.tuner = null;
            this.crossbar = null;

            object o;

            int hr = this.captureGraphBuilder.FindInterface(null, null, this.videoCaptureFilter, typeof(IAMTVTuner).GUID, out o);
            if (hr >= 0)
            {
                this.tuner = o as IAMTVTuner;
                o = null;

                hr = this.captureGraphBuilder.FindInterface(null, null, this.videoCaptureFilter, typeof(IAMCrossbar).GUID, out o);
                if (hr >= 0)
                {
                    this.crossbar = o as IBaseFilter;
                    o = null;
                }

                // Use the crossbar class to help us sort out all the possible video inputs
                // The class needs to be given the capture filters ANALOGVIDEO input pin
                IPin pinVideo = DsFindPin.ByCategory(this.videoCaptureFilter, PinCategory.AnalogVideoIn, 0);
                if (pinVideo != null)
                {
                    try
                    {
                        this.crossbarHelper = new CrossbarHelper(pinVideo);
                    }
                    catch{}
                    Marshal.ReleaseComObject(pinVideo);
                }

                hr = this.captureGraphBuilder.FindInterface(null, null, this.videoCaptureFilter, typeof(IAMTVAudio).GUID, out o);
                if (hr >= 0)
                {
                    this.amTVAudio = o as IAMTVAudio;
                    o = null;
                }
            }
        }