The GraphEdit is hung when I try to connect my custom filter to upstream source filter.

Question

Hi there,

I write a trans-In-place filter. I want my filter connected to upstream source filter. 

My code snippet is below:

HRESULT CMyFilter::Transform(IMediaSample* pSample)
{
    return S_OK;
}

HRESULT CMyFilter::CheckInputType(const CMediaType* pmt)
{
    CheckPointer(pmt, E_POINTER);

    if(pmt->majortype != MEDIATYPE_Stream) {
        return VFW_E_TYPE_NOT_ACCEPTED;
    }
   
    if((pmt->subtype != MEDIASUBTYPE_MPEG2_TRANSPORT)){
        return VFW_E_TYPE_NOT_ACCEPTED;
    }

    return S_OK;
}

Then, I open the GraphEdit and add the File Source (Async.) filter to the graph.

And, I select a .mpg file and connect the File Source (Async.) filter to my trans-In-place filter.

The GraphEdit is hung! Why? What's wrong with my code?

Thanks in advance.

Answer 1

JupiterLee wrote:

>

>I write a trans-In-place filter. I want my filter connected to upstream source filter. 

>...

>Then, I open the GraphEdit and add the File Source (Async.) filter to the graph.

>

>And, I select a .mpg file and connect the File Source (Async.) filter to my trans-In-place filter.

>

>The GraphEdit is hung! Why? What's wrong with my code?

 

It is unusual for a file filter to produce MEDIATYPE_Stream /

MEDIASUBTYPE_MPEG2_TRANSPORT.  Transport streams don't usually come from a

file.  Have you verified that's what the file filter's output pin produces?

--

Tim Roberts, [e-mail]

Providenza & Boekelheide, Inc.

 

---

Tim Roberts, VC++ MVP Providenza & Boekelheide, Inc.

Answer 2

Hi Tim,

Thanks.

I set the wrong media type and media subtype.