OMAP3 DSS: using overlays

Move the post to omap35x forum.

BR

Tsvetolin Shulev

Hi Konstantin,

The following examples about GStreamer pipelines and TIDmaiVideoSink for omap35x at the link below should be useful for you:

http://processors.wiki.ti.com/index.php/Example_GStreamer_Pipelines#OMAP35x

BR

Tsvetolin Shulev

Thank you for reply. But I know how to use gstreamer. I need something like at picture:

where GFX overlay show Qt QWS application output and VID1 overlay display camera output by GStreamer TIDmaiVideoSink.

Hi Konstantin,

After I saw the picture I understood what exactly is the issue. I'm not expert about GStreamer but I suggest you some helpful articles about overlay management and display overlays at the following links:

processors.wiki.ti.com/index.php/UserGuideDisplayDrivers_PSP_03.00.00.05

http://omappedia.org/wiki/Bootargs_for_enabling_display

For more advanced understanding of the DSS overlays read sections 15.4.2 Display Controller Functionalities and 15.5.3 Display Controller Basic Programming Model from the omap3530 TRM at the link:

http://www.ti.com/lit/ug/spruf98y/spruf98y.pdf

BR

Tsvetolin Shulev

OK. I read what you suggested. But I still don't understand. There is picture

As I understand gstreamer element TIDmaiVideoSink use /dev/video1.  What exactly command links /dev/video1 to VID1 overlay or tell me if this isn't impossible. By default TIDmaiVideoSink use GFX overlay.

Hello,

I am not familiar with this board.

Konstantin Primenko said:

What exactly command links /dev/video1 to VID1 overlay

If i understand you right it should be possible through sysfs.

Also you could check this e2e forum thread it may be will help you:

http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/p/136615/514613.aspx

Best Regards,

Margarita

I figured out something interesting. As I said earlier, TIDmaiVideoSink use /dev/video1 as output device, so it interfaces via v4l2. But although above picture says that overlays can work over /dev/videox devices, actually it doesn't. I know it because I disable all overlays, and after this TIDmaiVideoSink still display camera picture. After I exit TIDmaiVideoSink, there is blue screen and nothing more. It seems, that it is bug of kernel driver, isn't it?