[MPlayer-dev-eng] [PATCH] cleanup swscale usage

[Jason Tackaberry]

Hi Luca,

On Tue, 2006-05-09 at 10:12 +0200, Luca Abeni wrote:
> I am currently trying to move swscale from the mplayer tree to the
> ffmpeg tree (so that it can be used by ffmpeg and by other projects).
> This would require some modifications to swscale (I already posted some
> patches on the ffmpeg mailing list), and some modifications to mplayer
> to use the modified swscale.

Some time ago I looked at porting swscale to xine as a shared library.
One of the requirements is that it had to compile with -fPIC (for
x86_64).  This involved changing the code not to clobber the ebx
register.  I've attached a patch that does this.  It's against an older
version of swscaler so might not apply cleanly to recent cvs, but should
give you an idea.

Unfortunately I hit a roadblock with my efforts and haven't had time to
revisit it.  I was getting a linker error (not compiler error) on x86_64
with -fPIC.  I can't find the post I made to mplayer-dev-eng about this,
but here's a reference to another post on xine devel list:

   http://article.gmane.org/gmane.comp.video.xine.devel/14594

I was able to get things working fine on x86 with -fPIC.  It was just
x86_64 that gave me grief, and my asm-fu isn't strong enough to grok the
issues in swscaler's code.

Anyway, I'd be thrilled to see swscaler more portable. :)

Cheers,
Jason.
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