ICINFO

  • Article

The ICINFO structure contains compression parameters supplied by a video compression driver. The driver fills or updates the structure when it receives the ICM_GETINFO message.

typedef struct { 
    DWORD dwSize; 
    DWORD fccType; 
    DWORD fccHandler; 
    DWORD dwFlags; 
    DWORD dwVersion; 
    DWORD dwVersionICM; 
    WCHAR szName[16]; 
    WCHAR szDescription[128]; 
    WCHAR szDriver[128]; 
} ICINFO;

Members

dwSize

Size, in bytes, of the ICINFO structure.

fccType

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

fccHandler

A four-character code identifying a specific compressor.

dwFlags

Applicable flags. Zero or more of the following flags can be set:

VIDCF_COMPRESSFRAMES

Driver is requesting to compress all frames. For information about compressing all frames, see the ICM_COMPRESS_FRAMES_INFO message.

VIDCF_CRUNCH

Driver supports compressing to a frame size.

VIDCF_DRAW

Driver supports drawing.

VIDCF_FASTTEMPORALC

Driver can perform temporal compression and maintains its own copy of the current frame. When compressing a stream of frame data, the driver doesn't need image data from the previous frame.

VIDCF_FASTTEMPORALD

Driver can perform temporal decompression and maintains its own copy of the current frame. When decompressing a stream of frame data, the driver doesn't need image data from the previous frame.

VIDCF_QUALITY

Driver supports quality values.

VIDCF_TEMPORAL

Driver supports inter-frame compression.

dwVersion

Version number of the driver.

dwVersionICM

Version of VCM supported by the driver. This member should be set to ICVERSION.

szName

Short version of the compressor name. The name in the null-terminated string should be suitable for use in list boxes.

szDescription

Long version of the compressor name.

szDriver

Name of the module containing VCM compression driver. Normally, a driver does not need to fill this out.

Requirements

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Vfw.h.

See Also

Video Compression Manager, Video Compression Structures, ICM_COMPRESS_FRAMES_INFO, ICM_GETINFO