TX2 capture embedded line data

kenny_234 · March 30, 2020, 5:59am

Hi everyone,

I use TX2 the bsp version is r28.2，I want to capture embedded line data from camera, how to modify driver? Thanks.

ShaneCCC · March 30, 2020, 6:46am

You need to make sure the sensor have output embedded data first.
Then you can using argus API to get it.

https://docs.nvidia.com/jetson/l4t-multimedia/classArgus_1_1Ext_1_1ISensorPrivateMetadataRequest.html

kenny_234 · March 30, 2020, 6:59am

Hi ShaneCCC,

We capture sensor image data use V4L2 API, our application not use L4T Multimedia API. Can I get embedded data use V4L2 API?

ShaneCCC · March 30, 2020, 7:29am

Have a check the vi4_fops.c there emb_buf_addr to get the embedded data from the sensor. However current this buffer didn’t send back to user space you may need to modify the driver to send it back to use it.

kenny_234 · March 30, 2020, 12:00pm

Could you give me a patch? Thanks.

ShaneCCC · March 31, 2020, 3:16am

Sorry, I don’t have it.