JXL Encoder¶

JXL Encoder example resides in L2/demos/jxlEnc directory. The tutorial provides a step-by-step guide that covers commands for building and running kernel.

Executable Usage¶

Work Directory(Step 1)

The steps for library download and environment setup can be found in Vitis Codec Library. For getting the design,

cd L2/demos/jxlEnc

Build kernel(Step 2)

Run the following make command to build your XCLBIN and host binary targeting a specific device. Please be noticed that this process will take a long time, maybe couple of hours.

make run TARGET=hw

Run kernel(Step 3)

To get the benchmark results, please run the following command.

PATH_TO_BUILD/host.exe --xclbin PATH_TO_BUILD/jxlEnc.xclbin PNGFilePath JXLFilePath

Note: “PATH_TO_BUILD” is decided by your chosen “DEVICE=” when running hw build, Default arguments are set in Makefile.

JXL Encoder Input Arguments:

Usage: host.exe -[-xclbin]
       --xclbin:     the kernel name
       PNGFilePath:  the path to the input *.PNG
       JXLFilePath:  the path to the output *.jxl

Note: Default arguments are set in Makefile, you can use other pictures listed in the table.

Profiling¶

The hardware resource utilizations are listed in the following table. Different tool versions may result slightly different resource.

Table 1 IP resources for JXL encoder¶
IP	BRAM	URAM	DSP	FF	LUT
JxlEnc_lossy_enc_compute	364	53	498	145111	121741
JxlEnc_ans_clusterHistogram	70	28	51	60744	38507
JxlEnc_ans_initHistogram	150	41	95	64710	39289

Result¶

Table JxlEnc_lossy_enc_compute Encoder Performance¶
Image	Size	Time(ms)	Throughput(MP/s)
lena_c_512.png	512x512	3.63	72.21
hq_1024x1024.png	1024x1024	13.06	80.29
hq_2Kx2K.png	2048x2048	50.33	83.34

Table JxlEnc_ans_clusterHistogram Encoder Performance¶
Image	Size	Time(ms)	Throughput(MP/s)
lena_c_512.png	512x512	4.6	56.98
hq_1024x1024.png	1024x1024	14.6	71.82
hq_2Kx2K.png	2048x2048	41.13	101.97

JxlEnc_ans_initHistogram Encoder Performance¶
Image	Size	Time(ms)	Throughput(MP/s)
lena_c_512.png	512x512	6.07	43.19
hq_1024x1024.png	1024x1024	18.03	58.16
hq_2Kx2K.png	2048x2048	79.30	52.89