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IMixerOCXNotify::OnDataChange method (mixerocx.h)

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 OnDataChange method notifies the client when the video rectangle's aspect ratio or size, or the display palette, has changed.

Syntax

HRESULT OnDataChange(
  [in] ULONG ulDataFlags
);

Parameters

[in] ulDataFlags

Flag indicating which set of data has changed. The following flags are defined.

Flags Description
MIXER_DATA_ASPECT_RATIO (0x00000001) Picture aspect ratio.
MIXER_DATA_NATIVE_SIZE (0x00000002) The video stream's native size changed.
MIXER_DATA_PALETTE (0x00000004) The video palette changed.

Return value

If the method succeeds, it returns S_OK.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header mixerocx.h
Library Strmiids.lib

See also

IMixerOCX Interface

IMixerOCXNotify Interface