Edit

ICM_COMPRESS_QUERY message

  • 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_PTR) (LPVOID) lpbiInput; 
lParam = (DWORD_PTR) (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 Value

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

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