12.7. JPEGE

【Debug Information】

# cat /proc/cvitek/jpege
Module: [JPEGE] System Build Time [#1 SMP PREEMPT Sat Jan 23 02:50:26 CST 2021]
-----MODULE PARAM-------------------------------------------------
OnePack: 0       JpegeMiniBufMode: 0     JpegClearStreamBuf: 0   JpegeDeringMode: 0
-----CHN ATTR-----------------------------------------------------
ID: 0    bMjpeg: Y       PicType: YUV422         MaxWidth: 3840  MaxHeight: 2160         Width: 3840     Height: 2160    BufSize: 0      ByFrm: 1        MCU: 1  Qfactor: 0      C2GEn: 0        DcfEn: 0

【Analysis】

Record the encoding properties and status of each channel during JPEG encoding.

【Parameter Description】

Parameter		Decription
MODULEPARAM	OnePack	Mode in which streams are obtained 0: Streams are obtained in multi-packet mode. 1: Streams are obtained in single-packet mode.
	JpegeMiniBufMode	Mode of allocating the stream buffers 0: The stream buffers are allocated based on the resolution. 1: The lower limit for the stream buffer size is 32 KB. Users need to ensure that the size of the allocated stream buffer is appropriate.
	JpegClearStreamBuf	Whether to clear the stream buffers when the attribute of a JPEG encoding channel is set. 0: The stream buffers and context count are reserved. 1: The stream buffers are cleared.
	JpegeDeringMode	De-ring effect mode enable for the JPEG encoding channel 0: disabled 1: enabled. Under the same quantization table and Qfactor, the ring phenomenon can be reduced and the image file size can be decreased, but some image clarity and details are also lost.
CHN ATTR	ID	Channel ID
	bMjpeg	MJPEG encoding No: JPEG snapshot Yes: MJPEG encoding
	PicType	Picture type: YVU422 or YVU420
	MaxWidth	Maximum width of the encoding channel (unit: pixel)
	MaxHeight	Maximum height of the encoding channel (unit: pixel)
	Width	Picture width
	Height	Picture height
	BufSize	Stream buffer size (unit: byte)
	MCU	Number of minimum coded units (MCUs) in each embedded processor subsystem (ECS)
	ByFrm	Whether to obtain streams by frame Value: {0, 1}
	Qfactor	Channel Qfactor
	C2GEn	Color-to-gray enable Value: {0, 1}
	DcfEn	Whether the JPEG image has a thumbnail Value: {0, 1}