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[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

This section describes threading in DirectShow filters, and the steps you should take to avoid crashes or deadlocks in a custom filter.

The examples in this section use pseudocode to illustrate the code you will need to write. They assume that a custom filter is using classes derived from the DirectShow base classes, as follows:

  • CMyInputPin: Derived from CBaseInputPin.
  • CMyOutputPin: Derived from CBaseOutputPin.
  • CMyFilter: Derived from CBaseFilter.
  • CMyInputAllocator: The input pin's allocator, derived from CMemAllocator. Not every filter needs a custom allocator. For many filters, the CMemAllocator class is sufficient.

This section contains the following topics.

Data Flow for Filter Developers

Writing DirectShow Filters