How to develop only one custom Pin for a CTransformFilter

How to override only one Pin of a CTransformFilter?
-------------------------------------------------------

1.I want to implement the allocator for the Transform input pin.

How can we do this ?...


I developed my own CTransformInputPin derived class as follows :


class CMyAllocator : public CMemAllocator
{

};

class CNewTransformInputPin :public CTransformInputPin
{
friend class CMyAllocator;
};


I initialized my "CNewTransformInputPin" as follows :


class CMyTransformFilter : CTransformFilter
{
public:
CMyTransformFilter()
{
m_pInput = new CNewTransformInputPin();
}
};


while running the Graph, the GraphEdit hangs and I closed the application.

Solution :
-------------------

I modified it as follows :



class CMyTransformFilter : CTransformFilter
{
public:
CBasePin* GetPin(int i)
{
if( m_pInput == NULL)
{
m_pInput = new CNewTransformInputPin();
}

if( m_pOutput == NULL)
{
m_pOutput = new CTransformOutputPin();
}

if( i== 0) { return m_pInput;}
else if (i == 1) { return m_pOutput;}
else return NULL;
}
};





Now we can override the single Pin in a transform filter by Overriding the CBasePin* GetPin() fn...