ICOPEN - Win32 Multimedia Programmer's Reference (mmedia.hlp)

	Overview

	Group

ICOPEN

The ICOPEN structure contains information about the data stream being compressed or decompressed, the version number of the driver, and how the driver is used.

typedef struct {

DWORD dwSize;

DWORD fccType;

DWORD fccHandler;

DWORD dwVersion;

DWORD dwFlags;

LPRESULT dwError;

LPVOID pV1Reserved;

LPVOID pV2Reserved;

DWORD dnDevNode;

} ICOPEN;

Members
dwSize
Size, in bytes, of the structure.

fccType

Four-character code indicating the type of stream being compressed or decompressed. Specify "VIDC" for video streams.

fccHandler

Four-character code identifying a specific compressor.

dwVersion

Version of the installable driver interface used to open the driver.

dwFlags

Applicable flags indicating why the driver is opened. The following values are defined:

ICMODE_COMPRESS

Driver is opened to compress data.

ICMODE_DECOMPRESS

Driver is opened to decompress data.

ICMODE_DRAW

Device driver is opened to decompress data directly to hardware.

ICMODE_QUERY

Driver is opened for informational purposes, rather than for compression.

dwFlags

Error return values.

pV1Reserved
Reserved; do not use.

pV2Reserved
Reserved; do not use.

dnDevNode
Device node for plug and play devices.

Remarks
This structure is passed to video capture drivers when they are opened. This allows a single installable driver to function as either an installable compressor or a video capture device. By examining the fccType member of the ICOPEN structure, the driver can determine its function. For example, a fccType value of "VIDC" indicates that it is opened as an installable video compressor.

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