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ICM_DRAW_START_PLAY message

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The ICM_DRAW_START_PLAY message provides the start and end times of a play operation to a rendering driver. You can send this message explicitly or by using the ICDrawStartPlay macro.

ICM_DRAW_START_PLAY 
wParam = (DWORD_PTR) lFrom; 
lParam = (DWORD_PTR) lTo;

Parameters

lFrom

Start time.

lTo

End time.

Return Value

This message does not return a value.

Remarks

This message precedes any frame data sent to the rendering driver.

Units for lFrom and lTo are specified with the ICM_DRAW_BEGIN message. For video data this is normally a frame number. For more information about the playback rate, see the dwRate and dwScale members of the ICDRAWBEGIN structure.

If the end time is less than the start time, the playback direction is reversed.

Requirements

Requirement Value
Minimum supported client
 Windows 2000 Professional [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]
Header
Vfw.h

See also

Video Compression Manager

Video Compression Messages