How to Select Video Input ?

[Andres]

Hi, i am working with a TV tuner that have 3 inputs: S-Video, Composite and Tuner, the problem that i have is that the default input is S-Video, so if i change it to composite (input needed) each time i reboot the computer and the start the application again this settings come again to the default value (svideo).

I want to store in a config file the input needed (Svideo, Composite, Tuner) and every time the app starts set the correct video input. Another way i think was change the default input in windows registry, but i didn't find any key for that.

My question is How to achive this (Set input from code or change default input in windows registry).

Thank's in advance

Andres

[Andres]

I found the problem, this code:

for (int i = 0; i < iOutputPinCount; i++)
{
iCrossbar.get_CrossbarPinInfo(false, i, out iPinIndexRelated, out cPhysicalConnectorType);
if (cPhysicalConnectorType == PhysicalConnectorType.Video_VideoDecoder) iPinIndexOutput = iPinIndexRelated;
}
for (int i = 0; i < iInputPinCount; i++)
{
iCrossbar.get_CrossbarPinInfo(true, i, out iPinIndexRelated, out cPhysicalConnectorType);
if (cPhysicalConnectorType == PhysicalConnectorType.Video_Composite) iPinIndexInput = iPinIndexRelated;
}
// connexion du crossbar
iCrossbar.Route(iPinIndexOutput, iPinIndexInput);
}

Sets the input Pin for Composite to 4 and the output pin for Video Decoder to 1

But the correct values are 1 and 0 (I saw these values in the crossbar window of Amcap),

so this code works fine:

iPinIndexInput=1;
iPinIndexOutput=0;
// connexion du crossbar
iCrossbar.Route(iPinIndexOutput, iPinIndexInput);

[chossette]

I would suggere you using the crossbar filter, which permit to configure which input to use...

To get the crossbar
IAMCrossbar iCrossbar = null;
m_fGB2.FindInterface( null, null, m_fSource, typeof(IAMCrossbar).GUID, out o );
iCrossbar = o as IAMCrossbar; o = null;

to seek for the composite entry for example :
if (iCrossbar != null)
{
int iOutputPinCount = 0, iInputPinCount = 0, iPinIndexRelated = 0, iPinIndexOutput = 0, iPinIndexInput = 0;
PhysicalConnectorType cPhysicalConnectorType;
iCrossbar.get_PinCounts(out iOutputPinCount, out iInputPinCount);
for (int i = 0; i < iOutputPinCount; i++)
{
iCrossbar.get_CrossbarPinInfo(false, i, out iPinIndexRelated, out cPhysicalConnectorType);
if (cPhysicalConnectorType == PhysicalConnectorType.Video_VideoDecoder) iPinIndexOutput = iPinIndexRelated;
}
for (int i = 0; i < iInputPinCount; i++)
{
iCrossbar.get_CrossbarPinInfo(true, i, out iPinIndexRelated, out cPhysicalConnectorType);
if (cPhysicalConnectorType == PhysicalConnectorType.Video_Composite) iPinIndexInput = iPinIndexRelated;
}
// connexion du crossbar
iCrossbar.Route(iPinIndexOutput, iPinIndexInput);
}

hope that help !

[chossette]

I would suggere you using the crossbar filter, which permit to configure which input to use...

To get the crossbar
IAMCrossbar iCrossbar = null;
m_fGB2.FindInterface( null, null, m_fSource, typeof(IAMCrossbar).GUID, out o );
iCrossbar = o as IAMCrossbar; o = null;

to seek for the composite entry for example :
if (iCrossbar != null)
{
int iOutputPinCount = 0, iInputPinCount = 0, iPinIndexRelated = 0, iPinIndexOutput = 0, iPinIndexInput = 0;
PhysicalConnectorType cPhysicalConnectorType;
iCrossbar.get_PinCounts(out iOutputPinCount, out iInputPinCount);
for (int i = 0; i < iOutputPinCount; i++)
{
iCrossbar.get_CrossbarPinInfo(false, i, out iPinIndexRelated, out cPhysicalConnectorType);
if (cPhysicalConnectorType == PhysicalConnectorType.Video_VideoDecoder) iPinIndexOutput = iPinIndexRelated;
}
for (int i = 0; i < iInputPinCount; i++)
{
iCrossbar.get_CrossbarPinInfo(true, i, out iPinIndexRelated, out cPhysicalConnectorType);
if (cPhysicalConnectorType == PhysicalConnectorType.Video_Composite) iPinIndexInput = iPinIndexRelated;
}
// connexion du crossbar
iCrossbar.Route(iPinIndexOutput, iPinIndexInput);
}

hope that help !

[Andres]

Thank's for your reply, i put your code in the device initialization method, but seems i made something wrong because the device keep working with SVideo, here is my code:

private void SetupGraph(DsDevice dev, int iFrameRate, int iWidth, int iHeight, string FileName, Control hControl)
{
int hr;

            ISampleGrabber sampGrabber = null;
            IBaseFilter baseGrabFlt = null;
            IBaseFilter capFilter = null;
            IBaseFilter muxFilter = null;
            IFileSinkFilter fileWriterFilter = null;
            ICaptureGraphBuilder2 capGraph = null;
            // Get the graphbuilder object
            m_FilterGraph = new FilterGraph() as IFilterGraph2;
            m_mediaCtrl = m_FilterGraph as IMediaControl;

if DEBUG

            m_rot = new DsROTEntry(m_FilterGraph);

endif

            try
            {

                // Get the ICaptureGraphBuilder2
                capGraph = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();

                // Get the SampleGrabber interface
                sampGrabber = (ISampleGrabber)new SampleGrabber();

                // Start building the graph
                hr = capGraph.SetFiltergraph(m_FilterGraph);
                DsError.ThrowExceptionForHR(hr);

                // Add the video device
                hr = m_FilterGraph.AddSourceFilterForMoniker(dev.Mon, null, dev.Name, out capFilter);
                DsError.ThrowExceptionForHR(hr);

                baseGrabFlt = (IBaseFilter)sampGrabber;
                ConfigureSampleGrabber(sampGrabber);

                // Add the frame grabber to the graph
                hr = m_FilterGraph.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                DsError.ThrowExceptionForHR(hr);

                // If any of the default config items are set
                if (iFrameRate + iHeight + iWidth > 0)
                {
                    SetConfigParms(capGraph, capFilter, iFrameRate, iWidth, iHeight);
                }

                // To get the crossbar 
                IAMCrossbar iCrossbar = null;
                object o;
                capGraph.FindInterface(null, null,capFilter, typeof(IAMCrossbar).GUID, out o);
                iCrossbar = o as IAMCrossbar; o = null;


                //to seek for the composite entry for example : 
                if (iCrossbar != null)
                {
                    int iOutputPinCount = 0, iInputPinCount = 0, iPinIndexRelated = 0, iPinIndexOutput = 0, iPinIndexInput = 0;
                    PhysicalConnectorType cPhysicalConnectorType;
                    iCrossbar.get_PinCounts(out iOutputPinCount, out iInputPinCount);
                    for (int i = 0; i < iOutputPinCount; i++)
                    {
                        iCrossbar.get_CrossbarPinInfo(false, i, out iPinIndexRelated, out cPhysicalConnectorType);
                        if (cPhysicalConnectorType == PhysicalConnectorType.Video_VideoDecoder) iPinIndexOutput = iPinIndexRelated;
                    }
                    for (int i = 0; i < iInputPinCount; i++)
                    {
                        iCrossbar.get_CrossbarPinInfo(true, i, out iPinIndexRelated, out cPhysicalConnectorType);
                        if (cPhysicalConnectorType == PhysicalConnectorType.Video_Composite) iPinIndexInput = iPinIndexRelated;
                    }
                    // connexion du crossbar 
                    iCrossbar.Route(iPinIndexOutput, iPinIndexInput);
                }

                bool acceptPreview = false;
                if (this.InitMode == CaptureMode.SnapAndRec)
                {

                    // Create a filter for the output avi file
                    hr = capGraph.SetOutputFileName(MediaSubType.Avi, FileName, out muxFilter, out fileWriterFilter);
                    DsError.ThrowExceptionForHR(hr);
                    hr = capGraph.RenderStream(PinCategory.Capture, MediaType.Video, capFilter, baseGrabFlt, muxFilter);
                    DsError.ThrowExceptionForHR(hr);
                    try
                    {
                        //Render any preview pin of the device
                        hr = capGraph.RenderStream(PinCategory.Preview, MediaType.Video, capFilter, null, null);
                        DsError.ThrowExceptionForHR(hr);
                        acceptPreview = true;
                    }
                    catch (Exception ex)
                    {
                        Debug.WriteLine(ex.Message);
                    }
                    //// Now that sizes are fixed, store the sizes
                    SaveSizeInfo(sampGrabber);

                    if (acceptPreview)
                    {
                        ConfigVideoWindow(hControl);
                    }

                }
                else if (this.initMode == CaptureMode.OnlySnap)
                {
                    hr = capGraph.RenderStream(PinCategory.Capture, MediaType.Video, capFilter, baseGrabFlt, muxFilter);
                    DsError.ThrowExceptionForHR(hr);
                    SaveSizeInfo(sampGrabber);
                    ConfigVideoWindow(hControl);
                }
                this.state = CaptureState.Ready;
            }
            finally
            {
                if (fileWriterFilter != null)
                {
                    Marshal.ReleaseComObject(fileWriterFilter);
                    fileWriterFilter = null;
                }
                if (muxFilter != null)
                {
                    Marshal.ReleaseComObject(muxFilter);
                    muxFilter = null;
                }
                if (capFilter != null)
                {
                    Marshal.ReleaseComObject(capFilter);
                    capFilter = null;
                }
                if (sampGrabber != null)
                {
                    Marshal.ReleaseComObject(sampGrabber);
                    sampGrabber = null;
                }
            }
        }

[chossette]

Have you try debugging to verify that input and output pin of the crossbar are well finded ?

[eagleeye]

Hi Thanks for the help in C#.. However
the iPinIndexOutput, iPinIndexInput should be the value of "i" in
the FOR loops

Vb.net working code.

Dim o As Object = Nothing

Dim iCrossbar As IAMCrossbar = Nothing

Dim iOutputPinCount As Integer = 0, iInputPinCount As Integer = 0,
iPinIndexRelated As Integer = 0, iPinIndexOutput As Integer = 0,
iPinIndexInput As Integer = 0

CaptureGraphBuilder.FindInterface(PinCategory.Capture, Nothing, sourceFilter,
GetType(IAMCrossbar).GUID, o)
iCrossbar = TryCast(o, IAMCrossbar)
o = Nothing

'to seek for the composite entry for example :
If iCrossbar IsNot Nothing Then

Dim cPhysicalConnectorType As PhysicalConnectorType
iCrossbar.get_PinCounts(iOutputPinCount, iInputPinCount)

' we want the INDEX to the connectortype NOT the related index.
'

For i As Integer = 0 To iOutputPinCount - 1

iCrossbar.get_CrossbarPinInfo(False, i, iPinIndexRelated,
cPhysicalConnectorType)

If cPhysicalConnectorType = PhysicalConnectorType.Video_VideoDecoder Then

iPinIndexOutput = i
Exit For

End If
Next

For i As Integer = 0 To iInputPinCount - 1
iCrossbar.get_CrossbarPinInfo(True, i, iPinIndexRelated,
cPhysicalConnectorType)
' Debug.WriteLine("Inp Cphysconnectortype " *
iPinIndexRelated.ToString & " = " &
cPhysicalConnectorType.ToString)

If cPhysicalConnectorType = PhysicalConnectorType.Video_Composite Then
iPinIndexInput = i
Exit For

End If
Next
' connexion du crossbar
iCrossbar.Route(iPinIndexOutput, iPinIndexInput)

End If

Hope this helps