Anteckning
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The ICGetBuffersWanted macro queries a driver for the number of buffers to allocate. You can use this macro or explicitly call the ICM_GETBUFFERSWANTED message.
Syntax
DWORD ICGetBuffersWanted(
hic,
lpdwBuffers
);
Parameters
hic
Handle to a driver.
lpdwBuffers
Address to contain the number of samples the driver needs to efficiently render the data.
Return value
Type: DWORD
Returns ICERR_OK if successful or ICERR_UNSUPPORTED otherwise.
Remarks
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.
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 | vfw.h |