Re: [Open2x-devel] SDL YV12 overlay support

[John W. <Joh...@Di...>]

Hi Matt,

>Ok, I _now_ am interested in getting hardware YV12 surfaces working.

Cool

>I've read the MMSP2 PDF manual and I think I understand everything in there

>(so far) about using the FDC to convert YV12 to YUY2 except the source 
>address part.  All I see is a base offset, X offset, and Y offset for the 
>Luminance, Cb, and Cr planes.  Offset from what?  hehe... I was hoping I 
>could provide a 32-bit absolute memory address but that doesn't seem the 
>case.  Any ideas on how to provide the source address?

I'll try and zip up and mail over what I have so far in the morning, it's
not very neat (understatement) but it does give you an idea of how this
should work, I am working from within a RAW environment (no Linux) but you
should be able to transpose it to use the symbols exposed by the kernel mode
FDC driver (FDC_Util, FDC_Run, FDC_IsBusy and FDC_Stop if I remember rightly
with most usfull stuff passed into FDC_Util). 

The driver defines the various YUV formats with names such as
FDC_CHROMA_420, FDC_CHROMA_422, FDC_CHROMA_444 etc. internally. Other then
that I think it is just as the book says ;).

John