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ICM_DRAW_START message

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The ICM_DRAW_START message notifies a rendering driver to start its internal clock for the timing of drawing frames. You can send this message explicitly or by using the ICDrawStart macro.

ICM_DRAW_START 
wParam = 0; 
lParam = 0;

Return Value

This message does not return a value.

Remarks

This message is used by hardware that performs its own asynchronous decompression, timing, and drawing.

When the driver receives this message, it should start rendering data at the rate specified with the ICM_DRAW_BEGIN message.

The ICM_DRAW_START and ICM_DRAW_STOP messages do not nest. If your driver receives ICM_DRAW_START before rendering is stopped with ICM_DRAW_STOP, it should restart rendering with new parameters.

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