The ICM_GETBUFFERSWANTED message queries a driver for the number of buffers to
allocate. You can send this message explicitly or by using the ICGetBuffersWanted
wParam = (DWORD) (LPVOID) lpdwBuffers;
lParam = 0;
Address to contain the number of samples the driver needs to efficiently
render the data.
Returns ICERR_OK if successful or ICERR_UNSUPPORTED otherwise.
This message is used by drivers that use hardware to render data and want to
ensure a minimal time lag caused by waiting for buffers to arrive. For example,
if a driver controls a video decompression board that can hold 10 frames of
video, it could return 10 for this message. This instructs applications to try to
stay 10 frames ahead of the frame it currently needs.
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