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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