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Building DirectShow Filters (Windows CE 5.0)

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If you build a DirectShow filter, you must set up your environment as described in Building DirectShow Applications in addition to performing the following steps:

  • Use the __stdcall calling convention.

  • Set the entry-point symbol to DllMainCRTStartup@12.

  • If you implement the filter as a DLL, include a definition (.def) file that exports the DLL functions. The following is an example of a definition file. The filter's output file is assumed to be Filter.dll.

    LIBRARY FILTER.DLL
DESCRIPTION 'Description of my filter'
EXPORTS 
    DllGetClassObject  
    DllCanUnloadNow  
    DllRegisterServer  
    DllUnregisterServer

In addition, if you are using the DirectShow base classes, do the following:

  • Build the base class library.
  • Include the header file Streams.h.
  • For release builds, add the preprocessor flag RELEASE. For debug builds, add the preprocessor flag DEBUG.
  • Link to the following library files.
    Library File Description
    Strmbase.lib If you do not use the DirectShow base classes, this library is not required.
    Strmiids.lib Exports class identifiers (CLSIDs) and interface identifiers (IIDs). All DirectShow applications require this library.
    Ole32.lib
    Ole32auth.lib
    Uuid.lib    		 These are COM libraries that are typically required when building filters. Depending on the needs of you project, you may not need all these libraries.

When you build your run-time image, Strmbase.lib is generated from the publicly available source code located at %_WINCEROOT%\Public\DirectX\Sdk\Samples\Dshow\Baseclasses. This library file will contain any changes or extensions that you make to the standard DirectShow base classes. Qtzbase.lib contains the library of standard DirectShow bases classes. It cannot be modified during the build process. You can use Qtzbase.lib in cases where you want to be certain that your application receives the default behavior from the DirectShow base classes. If you have not made any custom modifications to the DirectShow bases classes, then Strmbase.lib and Qtzbase.lib will both provide exactly the same results.

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