ICDecompressBegin

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

DWORD ICDecompressBegin(

hic,
lpbiInput,
lpbiOutput
);

Parameters

hic

Handle of a decompressor.

lpbiInput

Address of a BITMAPINFO 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_DECOMPRESS 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.

See Also

BITMAPINFO, ICDecompressEnd, ICM_DECOMPRESS, ICM_DECOMPRESS_BEGIN, ICM_DECOMPRESS_END

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