Daniel Vetter wrote:
On Fri, May 31, 2013 at 03:23:41PM +0300, ville.syrjala@xxxxxxxxxxxxxxx wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Having both modes can be beneficial for video playback cases. If you can
match the video framerate exactly, and the audio and video clocks come
from the same source, you should be able to avoid dropped/repeated
frames without expensive operations such as resampling the audio to
match video output rate.
Rather than add both variants based on the CEA extension short video
descriptors in do_cea_modes(), add only one variant there. Once all
the EDID has been fully probed, do a loop over the entire probed mode
list, during which we add the other variants for all modes that match
CEA modes. This allows us to match modes that didn't come via the CEA
short video descriptors. For example one Samsung TV here doesn't have
the 640x480-60 mode as a SVD, but instead it's specified via a detailed
timing descriptor.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
A few people requested this. Originally I was a bit opposed to it, but
when I thought about it a bit more I figured if the audio and video
clocks come from the same source (or happen to be close enough w/o
significant drift), this could provide a better A/V sync w/o resampling
tricks.
Yeah, I think this should be useful for a bunch of people. I've recently
chatted with a few xbmc folks on #irc and one thing they've requested is
mode fine-tuning. For DP we should have plenty of precision, but for HDMI
we'd need to (slightly) frob the vtotal ever so often to compensate. With
some runtime-tuning a la npt we should have perfect a/v sync without any
audio resampling.
Apologies, for jumping in here, but assuming I haven't missed anything
you've done already: do you have any plans for supporting CEA interlaced
modes?
That's assuming they actually need any more support - I only know that
they are slightly wrong for me testing with radeon + my TV - are they
tested and known to work / not work on intel hw?
The symptom I get is not instantly obvious - the second half of the
bottom line gets rendered and repeated as the top line.
For me the reason that proper support could in theory be useful, is that
were there in future a way to sync up properly, my TV will do a nice
"free" deinterlace. Even on a fast quad core PC doing one as good on cpu
is not possible for HD 50i.
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