I.MX6 Framebuffer Overlay
From ArmadeusWiki
Page under construction...
Informations on this page are not guaranteed !!
i.MX6 offers hardware composition of 2 framebuffers for video output. Here are the instructions on how to use it.
 |
Note: These instructions are only available on APF6 with 3.14 Freescale kernel (apf6legacy_defconfig) |
Tools
- you will need to compile following tools:
$ cd target/demos/fb_alpha $ ../../../buildroot/output/host/usr/bin/arm-linux-gnueabihf-gcc -o fb_alpha fb_alpha.c
- install fb_alpha on your board's rootfs
Instructions
- Display something on main Framebuffer (/dev/fb0), here the stream from an analog camera:
# modprobe adv7280_tvin # modprobe mxc_v4l2_capture # gst-launch-1.0 imxv4l2videosrc ! imxg2dvideosink &
- Then activate auxiliary Framebuffer (/dev/fb1):
# echo 0 > /sys/class/graphics/fb1/blank
- and put it some stuff on it:
# fb-test -f 1 &
- then you can set alpha/overlay parameters with fb_alpha tool:
- here we move overlay to (200,200):
# ./fb_alpha -x 200 -y 200
- same but with no transparency:
# ./fb_alpha -x 200 -y 200 -g 1 -a 255
- same with alpha color/key set to GREEN:
# ./fb_alpha -x 200 -y 200 -g 1 -a 255 -k 0x00FF00
- here we move overlay to (200,200):
