[Mplayer-dev-eng] DOCS/DVD

[Nick Kurshev]

Hi, G bor L n rt!

On 2001-06-01 19:35:25 you wrote me:

>> It seems that topic Performance of SUBJ should be rewritten because it's out-of-date now!
>
>Ehhh ;-) OK. Since you optimize libac3 to support 3dnow opcodes as well
>you can mention some new information into that doc :) 
>Maybe you can write some performance advance in percentages or something.
>Yes I know that you've written something similar on this topic to the
>mailing list but I can't find it now :(
Yes, I already wrote this but don't receive any answers. I repeate with minor fixes:

I've finished 3dnow optimization of libac3.
Since Arpi want to release mplayer I'm interesting with
some things:
1. libac3 contains not tested parts. May be someone has non standard
ac3 files because I have samples only of Dolby AC3 2.0 and 5.1 so I've
tested not all cases of ac3 decoder. May be someone has
Dolby AC3 1.0 or 3.x? But probably 2.0 and 5.1 are most wide distributed
standards and their support is enough for mplayer.
2. What effect has 3dnow optimization on k6-2+ cpus?
(my Duron-750 is able to play the .vob files in realtime without any optimization
but 3dnow optimization give about 30% speedup of audio decoding -
measured by status string of mplayer: the last value is descreased
from 4.5% down to 3.3%)

Comments: It's at second pass of playing back. At first pass when file is not cached I have:
something about 8.9% of cpu usage with 3dnow.

Best regards! Nick (2001-06-01 21:45:54)




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