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IVMRFilterConfig::GetNumberOfStreams method (strmif.h)

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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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]

The GetNumberOfStreams method retrieves the number of input streams being mixed.

Syntax

HRESULT GetNumberOfStreams(
  [out] DWORD *pdwMaxStreams
);

Parameters

[out] pdwMaxStreams

Pointer to a double word that receives the number of streams being mixed, which is equal to the number of input pins on the VMR.

Return value

If the method succeeds, it returns S_OK. If it fails, it returns an error code.

Return code Description
E_POINTER
 pdwMaxStreams is invalid

Requirements

Requirement Value
Minimum supported client Windows XP with SP1 [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IVMRFilterConfig Interface

IVMRFilterConfig::SetNumberOfStreams

Using the Video Mixing Renderer