Hi all,

I have posted similar question in directshow group, but since my
problem is related more to audio, I decided to post it here instead. I
do apologize if this makes some of you feel inconvenient.

With the help from many good guys in directshow group, I know how to
write a custom source filter that I can use internally (without
register DLL).

I am developing an application for Windows Mobile 5 Pocket PC using
DirectShow.
I have a question:
I create a custom source filter based on IBaseFilter and
IBaseOutputPin. I can initialize the Graph Builder Manager and add the
filter. However, when I call IGraphBuilder::Render() on my output pin,
the application never returns from the function. Using debugger, I
realize that the application keeps on calling
IBaseOutputPin::GetMediaType(). Below is my graph diagram:

////// Audio Source Stream --> Source Filter --> Audio
Renderer //////

You should only return when the supplied index is actually a valid
index.

if(iPosition<0) return E_INVALIDARG;
if(iPosition>0) return VFW_S_NO_MORE_ITEMS;

// Return your mediatype as usual.

It keeps calling your GetMediaType until VFW_S_NO_MORE_ITEMS is
returned.

On Sep 15, 10:53 am, tun...@gmail.com wrote:

Thank you very much Tun,

From: "samkol649"

Have you read the doc page on IMediaControl::Run()?

http://msdn.microsoft.com/en-us/library/ms785876(VS.85).aspx

Also answered in ../video.

Please do not multi-post.

See: http://tmhare.mvps.org/help.htm#mp