DM8168 - V4L2/OpenMax capture support for WUXGA

Krunal Patil

Other Parts Discussed in Thread: TVP7002

Hi,

I want to capture and display RGB 24-bit WUXGA (1920 x 1200) resolution using DM8168. I know V4L2/OpenMax support RGB-24 bit capture. I have query related to WUXGA resolution. According to my understanding current V4L2/OpenMax does not support WUXGA resolution. Please confirm.

I understand, support for this resolution can be added - there is no hardware / software limitation for that.

I studied the V4L2 capture driver (drivers/media/video/ti81xx/ti81xxvin_main.c) but could not find WUXGA resolution support. I also checked "include/linux/fvid2.h" which list all the possible resolution - there also I could not find entry for WUXGA resolution.

Can anyone please tell me how can I add support for WUXGA resolution - for both capture and display?
Where should I make modifications?
Is there any document/wiki page exist for adding new resolution support?

Regards,

Krunal

over 13 years ago

0 HardikShah over 13 years ago

TI__Mastermind 20245 points

Hi,

Video input port can support upto 165MHz of pixel clock. So it will be possible to capture 1920X1200@60 with reduced VESA blanking. We have never tested this as of now. We have tested display till 1920X1200. For capture you need to feed in that resolution and it should be able to capture. For display you can use "timing" sysfs entry to make this work

0 Krunal Patil over 13 years ago in reply to HardikShah

Genius 3120 points

Hi Hardik,

Thats great.!

Can you please tell me with reduced VESA blanking, if I display any content from DM8168 display port to standard display will there be any problem?

How the standard display will recognize the display resolution - normal or I will see any change in the display (like cropped video or something like that). Since here only blanking interval will be reduced so I don't think it will affect the active video.

Please share your views.

Regards,

Krunal

0 Krunal Patil over 13 years ago in reply to Krunal Patil

Genius 3120 points

Also, for capture I won't be able to simulate this on DM8168-EVM. Neither with expansion IO nor with VC daughter card.

TVP7002 or SII9135 will not support this resolution. Correct?

Regards,

Krunal

0 HardikShah over 13 years ago in reply to Krunal Patil

TI__Mastermind 20245 points

Most monitors and TVs support reduced VESA blanking if they support normal VESA. You should not see any difference.

0 HardikShah over 13 years ago in reply to HardikShah

TI__Mastermind 20245 points

Hi,

TVP7002 supports upto UXGA, SIL9135 data sheet is not very clear. You can try giving WUXGA and see if it works.

0 Krunal Patil over 13 years ago in reply to HardikShah

Genius 3120 points

This is Great.! Means I can verify this with expansion IO. Thanks for your valuable inputs.

Sorry, but I have few more queries:

Will OpenMax/V4L2 support scaling and cropping operation on 24-bit RGB WUXGA?
Will OpenMax VFPC support 24-bit RGB to YUV420 (for encoder input) and YUV422 (decoder output) to 24-bit RGB? I know, I can take dual output from OpenMax VFCC but with single output can I use VFPC to achieve this?

Regards,

Krunal

0 HardikShah over 13 years ago in reply to Krunal Patil

TI__Mastermind 20245 points

Krunal Patil said:
Will OpenMax/V4L2 support scaling and cropping operation on 24-bit RGB WUXGA?

OpenMax is never tested with RGB data

Krunal Patil said:
Will OpenMax VFPC support 24-bit RGB to YUV420 (for encoder input) and YUV422 (decoder output) to 24-bit RGB? I know, I can take dual output from OpenMax VFCC but with single output can I use VFPC to achieve this?

RGB is never tested but you can get RGB and YUV420 dual out. Conversion from YUV to RGB is possible only in capture path as of now.

0 Krunal Patil over 13 years ago in reply to HardikShah

Genius 3120 points

Hi Hardik,

Can I display YUV422/YUV420 WUXGA resolution on Video plane?

Regards,

Krunal

0 HardikShah over 13 years ago in reply to Krunal Patil

TI__Mastermind 20245 points

Yes,

0 Krunal Patil over 13 years ago in reply to HardikShah

Genius 3120 points

Thanks.!

0 Brijesh Jadav over 13 years ago in reply to Krunal Patil

TI__Guru**** 477075 points

YUV420 display is not supported directly. You have get it converted into YUV422 and them you can display.

Thx,

Brijesh

0 Krunal Patil over 13 years ago in reply to Brijesh Jadav

Genius 3120 points

Hi Brijesh,

Thanks for pointing out. I am aware of this limitation for display using video pipeline.

Regards,

Krunal

Processors

Processors forum

DM8168 - V4L2/OpenMax capture support for WUXGA