Re: File streaming

Dale_at_stopspam.com
Date: 10/21/04

  • Next message: Chris P. [MVP]: "Re: File streaming" 
    Date: Thu, 21 Oct 2004 10:46:20 -0400

    On Tue, 12 Oct 2004 14:18:54 -0400, "Chris P. [MVP]" <msdn@chrisnet.net> wrote:

    > > 2.-Shall i choose to use WMV, ASF or AVI file?
    > AVI is not designed for streaming and requires a lot of work to make it
    > streamable. WMV/ASF are designed for streaming but there is an issue that
    > there is no standard WMV parser filter available, which makes playback from
    > a memory/network source tricky.

    Hi. I have a need to do exactly that -- playback a WMV file from a memory source. You say that there is no standard parser filter available; at this point I'd gladly use a non-standard one! You say it's tricky -- could you give me some hints as to the nature of the tricks? [So long as it doesn't involve writing the data to disk; that's not acceptable.]

    FWIW, I'm working in Delphi with the DSpack interface to DirectShow. I use a freeware source filter that takes a memory stream which works great for avi and mpg files; now if I can just get wmv type files to work!

    Here's what I've tried; first, I tried to use the WM ASF Reader object:

      ReaderObject: IUnknown;
      FS : IFileSourceFilter;

        // create a WM ASF Reader filter
        ReaderObject := CreateComObject(CLSID_WMAsfReader);
        ReaderObject.QueryInterface(IFileSourceFilter, FS);
        ReaderObject.QueryInterface(IWMReaderAdvanced2,RA);
        RA.SetPlayMode(WMT_PLAY_MODE_STREAMING);
        RA.OpenStream(TStreamAdapter.Create(VideoSrcStream),Self as IWMReaderCallback,nil);

    The SetPlayMode returns E_FAIL and the OpenStream returns E_NOTIMPL. So then I tried to use the Synchronous Reader

      hr : HRESULT;
      pSyncReader: IWMSyncReader;

        hr := WMCreateSyncReader(nil,WMT_RIGHT_PLAYBACK,pSyncReader);
        hr := pSyncReader.OpenStream(TStreamAdapter.Create(VideoSrcStream));
        AddFilter(pSyncReader as IBaseFilter);

    where AddFilter is a routine that adds the filter to the graph and then renders its pin(s); I get an EIntfCastError (0x80040111) "interface not supported". Any suggestions?

    Thanks 

    -- 
Dale
  • Next message: Chris P. [MVP]: "Re: File streaming"

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