VXLIB_colorConvert_YUVXtoRGB_i8u_o8u

Functions
VXLIB_STATUS	VXLIB_colorConvert_YUVXtoRGB_i8u_o8u (const uint8_t src[restrict], const VXLIB_bufParams2D_t *src_addr, uint8_t dst[restrict], const VXLIB_bufParams2D_t *dst_addr, uint8_t x_value, uint8_t src_space)
VXLIB_STATUS	VXLIB_colorConvert_YUVXtoRGB_i8u_o8u_checkParams (const uint8_t src[], const VXLIB_bufParams2D_t *src_addr, const uint8_t dst[], const VXLIB_bufParams2D_t *dst_addr, uint8_t x_value, uint8_t src_space)

Detailed Description

Function Documentation

VXLIB_colorConvert_YUVXtoRGB_i8u_o8u()

VXLIB_STATUS VXLIB_colorConvert_YUVXtoRGB_i8u_o8u	(	const uint8_t	src[restrict],
		const VXLIB_bufParams2D_t *	src_addr,
		uint8_t	dst[restrict],
		const VXLIB_bufParams2D_t *	dst_addr,
		uint8_t	x_value,
		uint8_t	src_space
	)

Description:

Performs a color conversion operation from YUYV or UYVY to RGB.

Method:

Uses Q14 fixed point approximation of BT.709 and BT.601 coefficients

 BT.709
 R'= Y' + 0.0000*U + 1.5748*V
 G'= Y' - 0.1873*U - 0.4681*V
 B'= Y' + 1.8556*U + 0.0000*V

 BT.601
 R'= Y' + 0.000*U + 1.403*V
 G'= Y' - 0.344*U - 0.714*V
 B'= Y' + 1.773*U + 0.000*V

Parameters

[in]	src[]	Pointer to array containing input YUVX image (UQ8.0)
[in]	src_addr[]	Pointer to structure containing dimensional information of src
[out]	dst[]	Pointer to array containing output RGB image (UQ8.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst
[in]	x_value	Parameter indicating whether to convert from YUYV (x_value = 0) or UYVY (x_value = 1)
[in]	src_space	Parameter indicating the color space of src

Assumptions:

• I/O buffer pointers are assumed to be not aliased.
• YUVX Input (1 plane): src_addr
  • 'dim_x' refers to the number of luma pixel units per line
  • 'dim_y' refers to the number of lines in the image
  • 'stride_y' should be at least ('dim_x' * 2 * 1) bytes
• RGB (1 plane): dst_addr
  • 'dim_x' refers to the number of RGB pixel units per line
  • 'dim_y' refers to the number of lines in the image
  • 'stride_y' should be at least ('dim_x' * 3 * 1) bytes
• 'src_space' valid values:
  • VXLIB_COLOR_SPACE_NONE
  • VXLIB_COLOR_SPACE_BT601_525
  • VXLIB_COLOR_SPACE_BT601_625
  • VXLIB_COLOR_SPACE_BT709
  • VXLIB_COLOR_SPACE_DEFAULT

Performance Considerations:

• For best performance, the following parameter settings are recommended:
  • Set widths equal to strides
  • Align all pointers to 8 byte boundaries
  • Set all stride and width values to a multiple of 8

VXLIB_colorConvert_YUVXtoRGB_i8u_o8u_checkParams()

VXLIB_STATUS VXLIB_colorConvert_YUVXtoRGB_i8u_o8u_checkParams	(	const uint8_t	src[],
		const VXLIB_bufParams2D_t *	src_addr,
		const uint8_t	dst[],
		const VXLIB_bufParams2D_t *	dst_addr,
		uint8_t	x_value,
		uint8_t	src_space
	)

Description:

Checks the parameters for programming errors for the VXLIB_colorConvert_YUVXtoRGB_i8u_o8u function.

Method:

The following checks are made:

• There shall be no NULL pointers
• Both images shall have the same x and y dimensions
• The stride_y of the src image shall be equal to or greater than dim_x * 2
• The stride_y of the dst image shall be equal to or greater than dim_x * 3
• x_value shall be not greater than 1
• src_space shall be not greater than 3

Parameters

[in]	src[]	Pointer to array containing input YUVX image (UQ8.0)
[in]	src_addr[]	Pointer to structure containing dimensional information of src
[out]	dst[]	Pointer to array containing output RGB image (UQ8.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst
[in]	x_value	Parameter indicating whether to convert from YUYV (x_value = 0) or UYVY (x_value = 1)
[in]	src_space	Parameter indicating the color space of src