[MPlayer-dev-eng] VIS optimized motion compensation code.

[Romain Dolbeau]

James Morrison wrote:

 >  However, this code as licensed from David Miller is
 > GPL so can only be distributed as part of a gpl'd program, e.g. vlc, xine,
 > or mplayer.  Since ffmpeg is lgpl'd I haven't cc'd those developers. I've only
 > tested this code with mplayer, it's a patch to libavcodec so xine and vlc
 > should be able to use it without any changes.

Maybe the original author would be willing to re-release
the code under the LGPL. That'd be the easier solution.

>   As a side note, the altivec optimized code in ffmpeg is broken for the
> non-rounding functions, I'll try to get around to that sometime as it will
> make playing movies on my ibook much better.  The way I've been able to
> notice whether the non-rounding functions work correctly or not is to watch
> some movie, divX or something, and see if some colours seem to leak all over
> the image.  If they do, the code must be wrong, if they don't the code seems
> to be working.  Currently the altivec code does turn the video green whereas
> the VIS code doesn't (anymore, I did have that problem at one point).

Which no_rnd functions would that be ? What particular
codecs cause the problem ? What OS are you using ?
Is it encoding or decoding ?

I've extensively tested both functions
(put_no_rnd_pixels16_xy2_altivec and
  put_no_rnd_pixels8_xy2_altivec) and didn't see
any problem under MacOSX and linux/ppc...

-- 
Romain Dolbeau