The ICM_DRAW_SETTIME provides synchronization information to a rendering driver that handles the timing of drawing frames. The synchronization information is the sample number of the frame to draw. You can send this message explicitly or by using the ICDrawSetTime macro.
ICM_DRAW_SETTIME
wParam = (DWORD) lpTime;
lParam = 0;
Returns ICERR_OK if successful or an error otherwise.
Typically, the driver compares the specified value with the frame number associated with the time of its internal clock and attempts to synchronize the two if the difference is significant.
Use this message when the hardware performs its own asynchronous decompression, timing, and drawing, and the hardware relies on an external synchronization signal (the hardware is not being used as the synchronization master).
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
Video Compression Manager Overview, Video Compression Messages, ICDrawSetTime