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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,
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| lpbiInput,
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| lpbiOutput
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| );
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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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