Re: Adding overlays

[Zack Smith <plinius@comcast.net>]

Which display controller is this that you're speaking of?

Komal Shah wrote:
> 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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