icm-decompress-query.md

title	description	ms.assetid	keywords	topic_type	api_name	api_location	api_type	ms.topic	ms.date
ICM_DECOMPRESS_QUERY message (Vfw.h)	The ICM\_DECOMPRESS\_QUERY message queries a video decompression driver to determine if it supports a specific input format or if it can decompress a specific input format to a specific output format.	622dd1de-3f7a-4841-913c-282c2ad766f4	ICM_DECOMPRESS_QUERY message Windows Multimedia	apiref	ICM_DECOMPRESS_QUERY	Vfw.h	HeaderDef	reference	05/31/2018

ICM_DECOMPRESS_QUERY message

The ICM_DECOMPRESS_QUERY message queries a video decompression driver to determine if it supports a specific input format or if it can decompress a specific input format to a specific output format. You can send this message explicitly or by using the ICDecompressQuery macro.

ICM_DECOMPRESS_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 decompression is supported or ICERR_BADFORMAT otherwise.

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