imx6q jpeg encode

865410500 — Wed, 09 Jan 2019 11:52:51 GMT

Hi,everyone

I wanna do jpeg encode with vpu,is there any demo we can reference ?

Re: imx6q jpeg encode

gusarambula — Wed, 09 Jan 2019 22:00:46 GMT

Hello Cxy Cxy,

There is not a demo per se, but the unit test included with the Linux BSP supports jpeg decoder and encoder.

Please refer to the following example I found from the L4.1.15 unit_test:

“Take attached 3.jpg as example, it’s format is yuv420.

/unit_tests/mxc_vpu_test.out -E "-i 3.yuv -o test.jpg -f 7 -w 1600 -h 1200 -t 0"

/unit_tests/mxc_vpu_test.out -D "-i 3.jpg -o 3.yuv -f 7 -t 0"

One thing you need to take care is the yuv format.

In mxc_vpu_test/enc.c, the yuv format is hard code to MODE420. The code is

if (enc->cmdl->format == STD_MJPG)

enc->mjpg_fmt = MODE420; /* Please change this per your needs */

If your yuv format is 422 or 444, you need to change it to MODE422 or MODE444.

In the command, "-t" means CbCr interleaved, if your yuv source is planar, set "-t 0", if it's CbCr interleaved, set "-t 1". "

I hope this information helps!

Regards,

865410500 — Tue, 15 Jan 2019 09:09:35 GMT

Hi,gusarambula

First of all ,thank you so much.

And I wonder how can get the source code of mxc_vpu_test.out?

865410500 — Tue, 15 Jan 2019 10:22:28 GMT

I 've found the source code in imx-test/mxc_vpu_test .