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ThexFnv122rgbafunction converts NV12 image format to a 4-channel RGBA image. The inputs to the function are separate Y and UV planes. NV12 holds sub sampled data, Y plane is sampled at unit rate and 1 U and 1V value each for every 2x2 Y values. To generate the RGBA data, each U and V value is duplicated (2x2) times.

API Syntax

template void xFnv122rgba(xF::Mat & src_y,xF::Mat & src_uv,xF::Mat & _dst0)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 1.xFnv122rgba Function Parameter Descriptions
Parameter	Description
SRC_T	Input pixel type. Only 8-bit, unsigned, 1-channel is supported (XF_8UC1).
UV_T	Input pixel type. Only 8-bit, unsigned, 2-channel is supported (XF_8UC2).
DST_T	Output pixel type. Only 8-bit,unsigned,4channel is supported (XF_8UC4).
ROWS	Maximum height of input and output image (must be a multiple of 8).
COLS	Maximum width of input and output image (must be a multiple of 8).
NPC	Number of pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC8 for 1 pixel and 8 pixel operations respectively.
src_y	Input Y plane of size (ROWS, COLS).
src_uv	Input UV plane of size (ROWS/2, COLS/2).
_dst0	Output RGBA image of size (ROWS, COLS).

Resource Utilization

The following table summarizes the resource utilization of NV12 to RGBA for different configurations, as generated in theVivado HLS 2017.1version tool for theXilinx Xczu9eg-ffvb1156-1-i-es1FPGA, to process a HD (1080x1920) image.

Table 2.xFnv122rgba Function Resource Utilization Summary
Operating Mode	Operating Frequency (MHz)	Utilization Estimate
Operating Mode	Operating Frequency (MHz)	BRAM_18K	DSP_48Es	FF	LUT	CLB
1pixel	300	2	5	1191	708	195

Performance Estimate

The following table summarizes the performance of NV12 to IYUV for different configurations, as generated using theVivado HLS 2017.1version tool for theXilinx Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.

Table 3.xFnv122rgba Function Performance Estimate Summary
Operating Mode	Latency Estimate
Operating Mode	Max Latency (ms)
1 pixel operation(300Mhz)	6.9