The ICM_DECOMPRESSEX_QUERY message queries a video compression driver to determine if it supports a specific input format or if it can decompress a specific input format to a specific output format.
ICM_DECOMPRESSEX_QUERY
wParam = (DWORD) (LPVOID) &icdex;
lParam = sizeof(ICDECOMPRESSEX);
Returns ICERR_OK if the specified decompression is supported or ICERR_BADFORMAT otherwise.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
Video Compression Manager Overview, Video Compression Messages, ICDECOMPRESSEX