Adding overlays

Hi All,

I am a newbie into this overlay stuff. Let me explain
my confusion first:

1. I have a display controller hardware which support
"primary buffer window", "video1 window", "video2
window". video2 on top of -> video 1 on top of ->
primary.

Now primay buffer window is used by /dev/fb for normal
framebuffer support. 

2. Now I want to utilize overlay support given by
"video1 and 2", to have two playbacks/previews.

What should I do/use the interface to get this overlay
support given my video1 and video2 windows?? Ofcourse
I need to get around by setting lots of hardware
specific values...

1. Should I modify the frambuffer driver and adding
new ioctl to implement this overlay. 

2. Should I implement separate character device driver
and "mmap", "write" on the same?? e.g /dev/overlay1
/dev/overlay2 . 

So that a user application can give/write YUV 422 to
the driver and overlay will handle its conversion to
RGB 565 and display on the LCD in my case.

3. Should I implement /dev/video0 interace?? Here I am
confused a much, because I am already having capture
device - camera driver(v4l2), which implements the
overlay stuff for previewing while capture. Means it
supports the overlay and capture but *no* playback. 

Any pointers or drivers source code which will help me
to device strategy and the get the implementation
done. I am having working framebuffer and camera
driver. 

Let me know if you want more information. 

Thanx.

=====
---Komal Shah


		
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