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ICCompress
The ICCompress function compresses a single video image.
DWORD ICCompress(
HIC hic,
|
| DWORD dwFlags,
|
| LPBITMAPINFOHEADER lpbiOutput,
|
| LPVOID lpData,
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| LPBITMAPINFOHEADER lpbiInput,
|
| LPVOID lpBits,
|
| LPDWORD lpckid,
|
| LPDWORD lpdwFlags,
|
| LONG lFrameNum,
|
| DWORD dwFrameSize,
|
| DWORD dwQuality,
|
| LPBITMAPINFOHEADER lpbiPrev,
|
| LPVOID lpPrev
|
| );
|
|
Parameters
hic
Handle of the compressor to use.
dwFlags
Compression flag. The following value is defined:
ICCOMPRESS_KEYFRAME
Compressor should make this frame a key frame.
lpbiOutput
Address of a BITMAPINFO structure containing the output format.
lpData
Address of an output buffer large enough to contain a compressed frame.
lpbiInput
Address of a BITMAPINFO structure containing the input format.
lpBits
Address of the input buffer.
lpckid
Reserved; do not use.
lpdwFlags
Address of the return flags used in the AVI index. The following value is
defined:
AVIIF_KEYFRAME
Current frame is a key frame.
lFrameNum
Frame number.
dwFrameSize
Requested frame size, in bytes. Specify a nonzero value if the compressor
supports a suggested frame size, as indicated by the presence of the VIDCF_CRUNCH
flag returned by the ICGetInfo function. If this flag is not set or a data rate for the frame is not
specified, specify zero for this parameter.
A compressor might have to sacrifice image quality or make some other
trade-off to obtain the size goal specified in this parameter.
dwQuality
Requested quality value for the frame. Specify a nonzero value if the
compressor supports a suggested quality value, as indicated by the presence of the
VIDCF_QUALITY flag returned by ICGetInfo. Otherwise, specify zero for this parameter.
lpbiPrev
Address of a BITMAPINFO structure containing the format of the previous frame.
lpPrev
Address of the uncompressed image of the previous frame. This parameter is not
used for fast temporal compression. Specify NULL for this parameter when
compressing a key frame, if the compressor does not support temporal compression, or
if the compressor does not require an external buffer to store the format and
data of the previous image.
Return Values
Returns ICERR_OK if successful or an error otherwise.
Remarks
You can obtain the required by size of the output buffer by sending the ICM_COMPRESS_GET_SIZE message (or by using the ICCompressGetSize macro).
The compressor sets the contents of lpdwFlags to AVIIF_KEYFRAME when it creates a key frame. If your application creates
AVI files, it should save the information returned for lpckid and lpdwFlags in the file.
Compressors use lpbiPrev and lpPrev to perform temporal compression and require an external buffer to store the
format and data of the previous frame. Specify NULL for lpbiPrev and lpPrev when compressing a key frame, when performing fast compression, or if the
compressor has its own buffer to store the format and data of the previous image.
Specify non-NULL values for these parameters if ICGetInfo returns the VIDCF_TEMPORAL flag, the compressor is performing normal
compression, and the frame to compress is not a key frame.
See Also
ICGetInfo, BITMAPINFO, ICM_COMPRESS_GET_SIZE
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