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ICOPEN structure (vfw.h)

  • Article

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.

Syntax

typedef struct {
  DWORD   dwSize;
  DWORD   fccType;
  DWORD   fccHandler;
  DWORD   dwVersion;
  DWORD   dwFlags;
  LRESULT 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:

Name Description
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.

dwError

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.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Header vfw.h

See also

Video Compression Manager

Video Compression Structures