Graphics overlay on Video in DM814x (Matrix GUI application upon saLoopBack Video Playback)

Subha Viswanathan

Hi I would like to have matrix GUI application upon saLoopBack

I understand that saLoopBack cannot be used with Qt Application because both uses /dev/fbo

Hence by previous post suggestion I changed in saLoopBack to open /dev/fb1 device

I get this error

root@dm814x-evm:/usr/bin# ./saLoopBack
VPSS_GRPX : please stop grpx0 before continue.
Driver Name: ti81xxvin
Driver bus info: TI81xx Platform
Driver is capable of doing capture
VPSS_DCTRL: failed to disable the venc.
VPSS_DCTRL: failed to disable hdmi venc
saLoopBack:
Mode set is 720P60
VPSS_DCTRL: stop venc before changing mode
Driver Name:
Driver bus info: Ð@@`
=============================================================
Capture Format:
=============================================================
fmt.type = 1
fmt.width = 1280
fmt.height = 720
fmt.pixelformat = 1448695129
fmt.bytesperline = 2560
fmt.sizeimage = 1843200
=============================================================
=============================================================
Display Format:
=============================================================
fmt.type = 2
fmt.width = 1280
fmt.height = 720
fmt.pixelformat = 1448695129
fmt.bytesperline = 2560
fmt.sizeimage = 1843200
=============================================================
Segmentation fault
root@dm814x-evm:/usr/bin#

What changes are to be done in saLoopBack to support use /dev/fb1? I want Graphcis to be on top of video?

over 10 years ago

0 Margarita Gashova over 10 years ago

TI__Guru* 80190 points

Hello,

You should stop the graphics plane before to run it.

You should load load-hd-v4l2-firmware.sh the as well.

Best Regards,

Margarita

0 Subha Viswanathan over 10 years ago in reply to Margarita Gashova

Intellectual 470 points

I did load the v4l2 firmware and I had already got saLoopBack working

My issue is , I wanted saLoopBack to use /dev/fb1 instead of /dev/fb0

Hence I changed the code in setupbuffers to use /dev/fb1 instead of /dev/fb0

That gave me the above error and Segmentation Fault.

I read from VPSS User Guide, that we need to add memory for graphics pipeline 1 and 2 while performing insmod of ti81xxfb.ko

Could that be an issue? Generally How much memory could be allocated for Graphics pipeline 1

0 Margarita Gashova over 10 years ago in reply to Subha Viswanathan

TI__Guru* 80190 points

Hello,

Note:

HDMI Kernel module is required to view the output from On-Chip HDMI, see next section.

Application need develop their own software component to support the external display device connected with DVO2 VENC.

Add debug=1 to enable the debug function of vpss.ko,ti81xxfb.ko, and ti81xxvo.ko

Application need assign the memroy size when loading ti81xxfb.ko if accessing /dev/fb1 and /dev/fb2 nodes

$ insmod ti81xxfb.ko vram=0:XXM,1:YYM,2:ZZM

Best Regards,

Margarita

0 Subha Viswanathan over 10 years ago in reply to Margarita Gashova

Intellectual 470 points

Thanks. Now Iam able to bring up graphics overlay in /dev/fb1 , maintaining saLoopBack to use fb0
The following were the changes made in load-hd-firmware.sh
configure_fb1_hdmi()
{
echo "Configuring fb1 to HDMI"
#Enable fb1
echo 1 > /sys/devices/platform/vpss/graphics1/enabled
#Divert fb1 to HDMI
echo 1:hdmi > /sys/devices/platform/vpss/graphics1/nodes
#Disable HDMI DIsplay
#echo 0 > /sys/devices/platform/vpss/display0/enabled
#Reshuffle the display order. Give fb1 highest
echo 1:0/1/3/2 > /sys/devices/platform/vpss/display0/order
#Enable HDMi Display
#echo 1 > /sys/devices/platform/vpss/display0/enabled
}

And then allocated 4MB for /dev/fb1

In saLoopBack I have set the same resolution as incoming Video to get a proper UI

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Graphics overlay on Video in DM814x (Matrix GUI application upon saLoopBack Video Playback)