[pvrusb2] PAL-Plus support

[Mike Isely]

On Fri, 7 Nov 2008, Bjorn Danielsson wrote:

> Carsten Meier <cm at trexity.de> wrote:
> >[...]
> > All that is needed is a framebuffer (which the PVRUSB2 has) and a
> > little bit of logic to "unhide" the lines and to put them in sequence.
> > (I'm not an expert on this, just my guess... ;) )
> > Doing that in software on decoding of the MPEG stream is not possible
> > because the additional information is already lost.
> 
> OK, I think it would need at least firmware support to do this
> inside the pvrusb2 device.
> 
> And I'm not sure that the information gets lost after encoding
> to MPEG2, doesn't it use YUV for color? If it were RGB all black
> pixels would of course be (0,0,0) but black YUV pixels could keep
> the non-zero "U" component where the hidden data is stored.
> At least in theory.

I would be very surprised if the mpeg compression didn't cause the 
destruction of that extra data - the first goal of the lossy compression 
after all is to throw away data which doesn't otherwise impact the 
visual presentation.

  -Mike


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Mike Isely
isely @ pobox (dot) com
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