ICM_DECOMPRESSEX_BEGIN

	Overview

	Group

	Quick Info

The ICM_DECOMPRESSEX_BEGIN message notifies a video compression driver to prepare to decompress data.

wParam = (DWORD) (LPVOID) &icdex;

lParam = sizeof(ICDECOMPRESSEX);

Parameters
icdex

Address of a ICDECOMPRESSEX structure containing the input and output formats.

lParam

Size, in bytes, of ICDECOMPRESSEX.

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_DECOMPRESSEX messages efficiently.

If you want the driver to decompress data directly to the screen, send the ICM_DRAW_BEGIN message.

The ICM_DECOMPRESSEX_BEGIN and ICM_DECOMPRESSEX_END messages do not nest. If your driver receives ICM_DECOMPRESSEX_BEGIN before decompression is stopped with ICM_DECOMPRESSEX_END, it should restart decompression with new parameters.

See Also
ICDECOMPRESSEX, ICM_DECOMPRESSEX, ICM_DECOMPRESSEX_END, ICM_DRAW_BEGIN

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