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CMediaSample.SetActualDataLength method

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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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 SetActualDataLength method sets the length of the valid data in the buffer. This method implements the IMediaSample::SetActualDataLength method.

Syntax

HRESULT SetActualDataLength(
   long lLen
);

Parameters

lLen

Length of the valid data, in bytes.

Return value

Returns one of the HRESULT values shown in the following table.

Return code Description
S_OK
 Success.
VFW_E_BUFFER_OVERFLOW
 lLen is larger than the allocated buffer size.

Remarks

This method sets the CMediaSample::m_lActual member variable.

Requirements

Requirement Value
Header
Amfilter.h (include Streams.h)
Library
Strmbase.lib (retail builds);
Strmbasd.lib (debug builds)

See also

CMediaSample Class