ICDecompressBegin 2H4Z9PP

The ICDecompressBegin macro notifies a video decompression driver to prepare to decompress data. You can use this macro or explicitly call the ICM_DECOMPRESS_BEGIN22QYAL3 message.

DWORD ICDecompressBegin(

hic,
lpbiInput,
lpbiOutput
);

Parameters

hic

Handle of a decompressor.

lpbiInput

Address of a BITMAPINFO.2PXNH structure containing the input format.

lpbiOutput

Address of a BITMAPINFO structure containing the output format.

Return Values

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

Remarks

When the driver receives this message, it should allocate buffers and do any time-consuming operations so that it can process ICM_DECOMPRESS1AIBYAU messages efficiently.

The ICDecompressBegin and ICDecompressEnd macros do not nest. If your driver receives ICM_DECOMPRESS_BEGIN before decompression is stopped with ICM_DECOMPRESS_END, it should restart decompression with new parameters.