Anteckning
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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.
Syntax
DWORD ICDecompressBegin(
hic,
lpbiInput,
lpbiOutput
);
Parameters
hic
Handle to a decompressor.
lpbiInput
Pointer to a BITMAPINFO structure containing the input format.
lpbiOutput
Pointer to a BITMAPINFO structure containing the output format.
Return value
Type: DWORD
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.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | vfw.h |