Implement your own filter example?   

Hi there,

I'm trying to create some kind of media-center application where I need 
to get the sound data that comes from the source filter and do some 
stuff with it before sending it to the output filter.
In the DirectX SDK, I see the base classes to create your own filter, 
and in the "Programming with DirectShow" book, I can see an example to 
create your own DLL.

But I need to create my filter for use just inside my application, no 
registerable COM DLL or stuff like that.

IMO, that SDK and the book go too deep in all the possibilities of 
DShow, but don't help you with the basics.

Can someone please send me a minimal C++ code example to implement this?
Just a simple filter that copies the input to the output pin would be 
fine, so just that I see how the COM stuff works, and how the filter 
gets added and implemented.

I have compiled the BaseClasses library.

Please help!

Kind regards,
Dirk.

date: Wed, 22 Mar 2006 13:57:57 +0100   author:   Dirk Schippers

Re: Implement your own filter example?   

On Wed, 22 Mar 2006 13:57:57 +0100, Dirk Schippers wrote:

> I'm trying to create some kind of media-center application where I need 
> to get the sound data that comes from the source filter and do some 
> stuff with it before sending it to the output filter.
> In the DirectX SDK, I see the base classes to create your own filter, 
> and in the "Programming with DirectShow" book, I can see an example to 
> create your own DLL.
> 
> But I need to create my filter for use just inside my application, no 
> registerable COM DLL or stuff like that.

Just #ifdef out the DLL specific lines of one of the sample filters in the
SDK, create an instance of it with "new" and add it to the graph.

BTW, see the help link in my sig below for the appropriate places for dshow
questions (this newsgroup is not one of them).


CComPtr<IBaseFilter> m_dv_buffer;


m_dv_buffer = new CDVBuffer(t("DV Buffer"), NULL, &hr);
if (!m_dv_buffer || FAILED(hr))
	return E_FAIL;
m_graph_builder->AddFilter(m_dv_buffer, L"DV Buffer"));

-- 
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3. Benefit others:  follow up if you are helped or you found a solution

date: Wed, 22 Mar 2006 07:41:49 -0700   author:   The March Hare [MVP]