[FFmpeg-devel] pixfmt.h installed header using HAVE_BIGENDIAN?

[Michael Niedermayer]

On Sun, Jan 17, 2010 at 03:14:57PM +0100, Reimar D?ffinger wrote:
> On Sun, Jan 17, 2010 at 02:11:23PM +0000, M?ns Rullg?rd wrote:
> > Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
> > 
> > > On Sun, Jan 17, 2010 at 01:48:23PM +0000, M?ns Rullg?rd wrote:
> > >> Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
> > >> 
> > >> > Hello,
> > >> > am I missing something or is this a double-WTF?
> > >> > First, pixfmt.h uses HAVE_BIGENDIAN which is a big no-no for an installed header,
> > >> > but in addition it does not include config.h, so even pixdesc.c ends up saying
> > >> > In file included from pixdesc.c:22:
> > >> > pixfmt.h:130:5: warning: "HAVE_BIGENDIAN" is not defined
> > >> 
> > >> I know, and it's a problem.  Some discussion here:
> > >> http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/81522
> > >
> > > That one I though was fixed. Any objections if I just apply patch
> > > below for now, in the worst case it breaks building of some
> > > applications, but that's still better than breaking them
> > > at runtime on bigendian which would happen right now.
> > > Index: pixfmt.h
> > > ===================================================================
> > > --- pixfmt.h	(revision 21108)
> > > +++ pixfmt.h	(working copy)
> > > @@ -127,6 +127,8 @@
> > >      PIX_FMT_NB,        ///< number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of formats might differ between versions
> > >  };
> > >
> > > +#ifdef HAVE_AV_CONFIG_H
> > > +#include "config.h"
> > >  #if HAVE_BIGENDIAN
> > >  #   define PIX_FMT_NE(be, le) PIX_FMT_##be
> > >  #else
> > > @@ -148,5 +150,6 @@
> > >  #define PIX_FMT_YUV420P16 PIX_FMT_NE(YUV420P16BE, YUV420P16LE)
> > >  #define PIX_FMT_YUV422P16 PIX_FMT_NE(YUV422P16BE, YUV422P16LE)
> > >  #define PIX_FMT_YUV444P16 PIX_FMT_NE(YUV444P16BE, YUV444P16LE)
> > > +#endif
> > >
> > >  #endif /* AVUTIL_PIXFMT_H */
> > 
> > This is the type of temporary hack that will stay forever.  If we
> > intend to ever fix it, we might as well do so now.  Having a broken
> > API serves nobody.
> 
> Uh, that actually is my fix. What more do you want?
> We could make a pixfmt-internal header or move this stuff to internal.h or
> what it is called though...

swscale & libavcodec need the header + config.h
if theres a requirement to include config.h before iam fine with that
but it should be documented (and checked for own code)
about an avutil internal header, that doesnt help swscale & libavcodec

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

Dictatorship naturally arises out of democracy, and the most aggravated
form of tyranny and slavery out of the most extreme liberty. -- Plato
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