[j6-dra74x] Question for MultiCam view with less than 4 cams.

SangGyu Kim

Prodigy 60 points

Hi everyone,

I am trying to use a MultiCam usecase when there are less than 4 cams.

(Now, If I run the MultiCam usecase with 2 or 3 cams, there is nothing to be displayed.)

>> It is stuck in sync link, because 1 or 2 cams is not connected..

[CHAIN]

Capture(M4) > Sync(M4) > IPCOut_IPU1_0 -> IPCIn_A15 -> Display

Questions.

1. Please, give me any advice for this issue..

2. In capture link, there is a code like below.

/* new data frames have been captured, process them */
instId = (UInt32)Utils_msgGetPrm(pRunMsg);

Where the message(instId) comes from?

Best Regards,

Anderson

over 6 years ago

0 Alex Bashkov over 6 years ago

TI__Genius 13175 points

Hello SangGyu Kim,

1. Looks like you are trying to modify the surround view use case. Modifying a complete use case for another purpose can be very error prone. I would suggest looking into the use case generator tool(\vision_sdk\tools\vision_sdk_usecase_gen\) to fill in your camera criteria (i.e. 2 or 3 cams) and try to generate a new clean use case.

Thanks,

Alex

0 SangGyu Kim over 6 years ago in reply to Alex Bashkov

Prodigy 60 points

Hello Alex,

It is not about making another usecase.
I am trying to modify the capture or sync link for MultiCam (using 4 cameras) usecase.
When I use the MultiCam example with 4 cameras, then if one camera is broken or pulled out, I want to see the 3 remaining cameras.

Regards,
Anderson

P.S
Q. Could you advice me about where the isntId comes from?

In capture link, there is a code like below.
/* new data frames have been captured, process them */
instId = (UInt32)Utils_msgGetPrm(pRunMsg);

0 Alex Bashkov over 6 years ago in reply to SangGyu Kim

TI__Genius 13175 points

I didn't quite catch that you were pulling out sensors on the fly from your original post. We will ping the Vision SDK team to comment on both your questions.

Alex

0 Nikhil Devshatwar over 6 years ago in reply to Alex Bashkov

TI__Genius 9905 points

If you want 3 cameras to be displayed when one camera dies, then you don't need sync link.
Whole purpose of sync link is to synchronize output of all cameras.
It will wait for frames for each camera.

This is useful in surround view because the stitched image needs all frames synced.
If you don't need sync link, don't use one.

0 SangGyu Kim over 6 years ago in reply to Nikhil Devshatwar

Prodigy 60 points

Hello Alex,

If I don't use sync link, the camera order is changed very fast.
Could you guide me about the how to fill the buffer when the camera is pulled off?

Thanks.

0 Alex Bashkov over 6 years ago in reply to SangGyu Kim

TI__Genius 13175 points

Hello SangGyu Kim ,

Nikhil Devshatwar will reply. Wait for him to answer here soon.

Thanks
Alex

0 Nikhil Devshatwar over 6 years ago in reply to Alex Bashkov

TI__Genius 9905 points

Hello, If you are not using sync link, you'll get data from all four channels. Of course the data won't be received in fixed order. You have to refer to system_buffer :: channel nuber to identify which channel the buffer corresponds to. This way you can know exactly which camera a buffer corresponds. Not sure what you want to do if one pulls the camera. There is nothing you can do about this, you'll simply not get any buffers. Nikhil D

Processors

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[j6-dra74x] Question for MultiCam view with less than 4 cams.