[FFmpeg-devel] [PATCH][RFC] Lagarith Decoder.

Michael Niedermayer michaelni
Wed Aug 12 21:14:19 CEST 2009


On Wed, Aug 12, 2009 at 07:47:45PM +0100, M?ns Rullg?rd wrote:
> Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
> 
> > On Wed, Aug 12, 2009 at 06:59:42PM +0100, M?ns Rullg?rd wrote:
> >> Michael Niedermayer <michaelni at gmx.at> writes:
> >> 
> >> > On Wed, Aug 12, 2009 at 06:31:36PM +0200, Reimar D?ffinger wrote:
> >> >> On Wed, Aug 12, 2009 at 05:10:36PM +0100, M?ns Rullg?rd wrote:
> >> >> > Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
> >> >> > 
> >> >> > > On Wed, Aug 12, 2009 at 04:12:25PM +0100, M?ns Rullg?rd wrote:
> >> >> > >> Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
> >> >> > >> 
> >> >> > >> > Well, you still have to teach the compiler at least to use clz for
> >> >> > >> > av_log2, I think you haven't yet ;-)
> >> >> > >> 
> >> >> > >> I can't because it's in common.h, which is installed.  We really
> >> >> > >> should find a way to fix that.
> >> >> > >
> >> >> > > Just put the optimizations under HAVE_AV_CONFIG_H like everything else
> >> >> > > in there that is messy?
> >> >> > 
> >> >> > And keep adding to the mess?  That's not the way to do things.
> >> >> 
> >> >> Then how about adding a new internal header with that function and
> >> >> putting the version in the installed header under
> >> >> #ifndef HAVE_AV_CONFIG_H
> >> >> i.e. just to keep API compatibility?
> >> >> Possibly even deprecating that version?
> >> >> Would that be clean enough?
> >> >
> >> > It would be nice if applications using libav* could also use the optimized
> >> > version
> >> 
> >> I can't see a way to make that happen.
> >
> > Actually... You could install a pseudo-config.h that contains the
> > necessary CPU settings...
> > There is not really a reason we can't install generated headers...
> > Or am I missing something?
> 
> Doing so would require all FFmpeg-using apps to use the same compiler
> and flags as were used when configuring FFmpeg.  This is not
> reasonable.

a few #ifdefs in the header would solve that,
same compiler -> all optims
other compiler -> fallback to plain C


> 
> > Except maybe we should make clear that stuff in that header should not
> > be considered part of the public API.
> 
> If it's not public, there's no reason to install it.

unless something public depends on it ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many that live deserve death. And some that die deserve life. Can you give
it to them? Then do not be too eager to deal out death in judgement. For
even the very wise cannot see all ends. -- Gandalf
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