imx8dx linux driver v4l2 Support NV21 format

[songhongliang]

HI

I now hope that the v4l2 driver of imx8dx can support the format of V4L2_PIX_FMT_NV21, how do I need to modify it to achieve this function. I see that the driver already supports the V4L2_PIX_FMT_NV12 format.

Thanks!

[joanxie]

I don't know capture or output you mean, I assume that you mean capture, so do you mean your input video is format NV21?

[songhongliang]

HI

Yes, it is capture, I am using AHD to mipi chip bridge, I see that 9 capture formats are already supported in the imx8-isi-cap.c file, but format NV21 is not supported. I hope that the video stream in NV21 format can be directly obtained in the application.

Thanks!

[joanxie]

the format from chip bridge is NV21 or you need to convert the input video to NV21?

[songhongliang]

need to convert the input video to NV21

[joanxie]

what is your real capture data? do you need convert raw data to NV12? if yes, you can use software ISP do this,

"https://www.nxp.com.cn/docs/en/application-note/AN12060.pdf"