about direct show file format

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#33

From: wyx
Date: Mon, 06 Jul 1998 00:00

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hello,

    I want to write a direct show source filter which can read a wave
file(.wav) and connect to a
    audio renderer filter provided by direct show.

    However, I found that I need to specify the file media format (not
media type) in order to
    play the file using my filter.

    But I have look through those sample source filter codes, none of
them need to specify the file format.

    Can anyone tell me at which point the sample source code (say,
async) specify(get) the file format ?

    Or do I really need to specify the file format in order to connect
my filter to another filter ?
    At the beginning, I just specify the media type and media sub type.
But it fails to connect to another
    filter. After adding the code to specify the file format in the
GetMediaType(), the filter works.

    So is there any method that can make a source filter without specify
the file format ?

    Thank you very much !!

reagrds,
yung

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From: wyx <cswyxv@ust.hk>
Subject: about direct show file format
Date: 1998/07/06
Message-ID: <35A0BBD3.1015F65E@ust.hk>
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Organization: Hong Kong University of Science and Technology
Newsgroups: microsoft.public.directx,microsoft.public.multimedia.directx.dshow.activemovie,microsoft.public.win32.programmer.directx,tw.bbs.comp.hacker,hk.comp.hacker,microsoft.public.vc.mfc