Linux/TDA2: OV490 video output issue in VSDK 3.04.

John G

Prodigy 235 points

Part Number: TDA2

Tool/software: Linux

Hi ,

I am using a custom Board and running VSDK 3.04 with Linux usecase.

In VSDK 3.04 ,the ov490 video output via chains like this: IPU capture -> split ->IPC -> A15 -> SGX -> IPU display.

and in IPC Link , the Video BufAddr export to dmaFd ,mapped to tex[].

THE ISSUE is that SPLIT LINK using address manipulation only , the stitched two video exported to the same dmaFd,

so it cannot split the video frame. Any clues to help me split the stitched video buf ?

Best regards,

John

over 6 years ago

0 Anuj Gupta over 6 years ago

TI__Genius 15985 points

Hi,

Split link splits vertically the incoming video data to multiple channel in its output queue by changing the buffer address.
Can you tell me exactly what you want to do so that i can help you properly.

Regards,
Anuj

0 Brijesh Jadav over 6 years ago in reply to Anuj Gupta

TI__Guru**** 475745 points

i think it splits the frame horizontally. Essentially, for same input buffer, it gives out two buffer pointer, one for the start address and other middle of the line.. It does not really do any buffer copy, just buffer pointer manipulation
What exactly your requirement?

Regards,
Brijesh

0 John G over 6 years ago in reply to Brijesh Jadav

Prodigy 235 points

thanks for reply. I tested the srv linux usecase with ov490 ISP. But the 4 textures displayed 2 camera videos with 2 duplicated ones. as below.

I checked the code, the tex[0], tex[1] mapped the same dmaFd. So did the tex[2], tex[3]. I want 4 camera videos to displayed.

regards,

John

0 Anuj Gupta over 6 years ago in reply to John G

TI__Genius 15985 points

Hi,

Can you explain your complete setup.
As the above usecase has been designed by Ti for a specific customer which uses 4 cameras capturing at 1280*720 and 2 cameras going to OV490 which gives a total of 2 output of 2560*720 for 4 cameras input.

So if you have similar kind of setup then only use the above usecase.

Regards,
Anuj

0 John G over 6 years ago in reply to Anuj Gupta

Prodigy 235 points

Hi, Anuj

Thanks for reply.
It is the same kind of setup . A total of 2 output of 2560*720 for 4 cameras input.
I check the code about vmem and egl.
And print out the address before dma-export.
But I cannot find how to print out the address after dma-export in egl function.
How can I check the exported YUV address ? For comparing the different?

Regards,
John

0 Anuj Gupta over 6 years ago in reply to John G

TI__Genius 15985 points

Hi,

For debugging purpose can you try to run the similar usecase which is provided for bios for OV490

Regards,
Anuj

0 John G over 6 years ago in reply to Anuj Gupta

Prodigy 235 points

Hi,

Why not Linux usecase? Have ti tested for linux usecase?
It runs ok in Vision SDK 2.xx

Regards,
John

0 Anuj Gupta over 6 years ago in reply to John G

TI__Genius 15985 points

Hi,

Yes, you can go ahead with linux usecase also.
For better debugging can you modifying your usecase and add merge after the 2 splits link and then display and dynamically display all channels alternatively.
Above approach will be easier in debugging.

Regards,
Anuj

0 John G over 6 years ago in reply to Anuj Gupta

Prodigy 235 points

Hi,

Thanks for your suggest. I will try it.
Any suggest for debugging Linux usecase?

Regards,
John

0 Anuj Gupta over 6 years ago in reply to John G

TI__Genius 15985 points

Hi,

You can modify your linux usecase only, no need to move to bios.

Regards,
Anuj

0 John G over 6 years ago in reply to Anuj Gupta

Prodigy 235 points

Hi Anuj,

In my board, the YUV output from OV490 like this:

cam1 addr 1 | cam2 addr 2

Y1 Y2 ... Y1280 | Y1281 .... Y2560

Y2 ....

...

Y720 ........

U1, V1, ...

...

Now my problem is that the DMABUF export the data which 4K page aligned as a dmafd.

Any offset in this page are masked.

So how can I pass two address within this page to GPU?

Here is my other question thread:

e2e.ti.com/.../737370

Regards,
John

0 Yordan Kamenov over 6 years ago in reply to John G

TI__Mastermind 42515 points

Close the thread as there is a new one.

Regards,
Yordan

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Linux/TDA2: OV490 video output issue in VSDK 3.04.