ICDECOMPRESS

  • Article

The ICDECOMPRESS structure contains decompression parameters used with the ICM_DECOMPRESS message.

typedef struct { 
    DWORD              dwFlags; 
    LPBITMAPINFOHEADER lpbiInput; 
    LPVOID             lpInput; 
    LPBITMAPINFOHEADER lpbiOutput; 
    LPVOID             lpOutput; 
    DWORD              ckid; 
} ICDECOMPRESS;

Members

dwFlags

Applicable flags. The following values are defined:

ICDECOMPRESS_HURRYUP

Tries to decompress at a faster rate. When an application uses this flag, the driver should buffer the decompressed data but not draw the image.

ICDECOMPRESS_NOTKEYFRAME

Current frame is not a key frame.

ICDECOMPRESS_NULLFRAME

Current frame does not contain data and the decompressed image should be left the same.

ICDECOMPRESS_PREROLL

Current frame precedes the point in the movie where playback starts and, therefore, will not be drawn.

ICDECOMPRESS_UPDATE

Screen is being updated or refreshed.

lpbiInput

Pointer to a BITMAPINFOHEADER structure containing the input format.

lpInput

Pointer to a buffer containing the input data.

lpbiOutput

Pointer to a BITMAPINFOHEADER structure containing the output format.

lpOutput

Pointer to a buffer where the driver should write the decompressed image.

ckid

Chunk identifier from the AVI file.

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, BITMAPINFOHEADER, ICM_DECOMPRESS