ICM_DECOMPRESSEX_QUERY

wParam = (DWORD) (LPVOID) &icdex;
lParam = sizeof(ICDECOMPRESSEX);

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.

• Returns ICERR_OK if the specified decompression is supported or ICERR_BADFORMAT otherwise.

wParam

Address of a ICDECOMPRESSEX structure describing the input format.

lParam

Size, in bytes, of the ICDECOMPRESSEX structure.