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ICM_COMPRESS_QUERY

  • Article

The ICM_COMPRESS_QUERY message queries a video compression driver to determine if it supports a specific input format or if it can compress a specific input format to a specific output format. You can send this message explicitly or by using the ICCompressQuery macro.

ICM_COMPRESS_QUERY 
wParam = (DWORD) (LPVOID) lpbiInput; 
lParam = (DWORD) (LPVOID) lpbiOutput;

Parameters

lpbiInput

Pointer to a BITMAPINFO structure containing the input format.

lpbiOutput

Pointer to a BITMAPINFO structure containing the output format. You can specify zero for this parameter to indicate any output format is acceptable.

Return Values

Returns ICERR_OK if the specified compression is supported or ICERR_BADFORMAT otherwise.

Remarks

When a driver receives this message, it should examine the BITMAPINFO structure associated with lpbiInput to determine if it can compress the input format.

Requirements

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Vfw.h.

See Also

Video Compression Manager, Video Compression Messages, BITMAPINFO, ICCompressQuery