I thought it had to be deinterlaced as it was decoded. If we could just
decode and send at was ever res (720p, 1080i, 1080p) the stream is in,
then work would be offloaded to the TV. Might be a nice option for those
of us with marginal video cards.
On 1/19/2011 3:48 AM, Niko Mikkilä wrote:
Well, flat panel TVs have similar deinterlacing algorithms as what VDPAU
provides, but it would certainly be a nice alternative.
These are the key requirements to achieve interlaced output:
Get the right modelines for your video card and TV. Draw interlaced
fields to your frame buffer at field rate and in the correct order
(top field first or bottom field first). When drawing the field to the
frame buffer, do not overwrite the previous field still in the frame
buffer. Maintain 1:1 vertical scaling (no vertical scaling), so you
will need to switch video output to match the source video height
(480i, 576i or 1080i). Display the frame buffer at field rate and
synchronised to the graphics card vertical sync. Finally, there is NO
requirement to synchronise fields, fields are always displayed in the
same order they are written to the frame buffer, even if occasionally
fields are dropped.
Interesting. Could you perhaps write full instructions to some suitable
wiki and post the code that you used to do this? I'm sure others would
like to try it too.
--Niko
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