[FFmpeg-cvslog] r12144 - trunk/libavcodec/mpeg12.c
Michael Niedermayer
michaelni
Tue Feb 19 18:37:25 CET 2008
On Tue, Feb 19, 2008 at 12:19:39PM -0500, Rich Felker wrote:
> On Tue, Feb 19, 2008 at 04:55:14PM +0100, michael wrote:
> > Author: michael
> > Date: Tue Feb 19 16:55:14 2008
> > New Revision: 12144
> >
> > Log:
> > Reduce the number of senselessly scanned bytes.
> >
> >
> > Modified:
> > trunk/libavcodec/mpeg12.c
> >
> > Modified: trunk/libavcodec/mpeg12.c
> > ==============================================================================
> > --- trunk/libavcodec/mpeg12.c (original)
> > +++ trunk/libavcodec/mpeg12.c Tue Feb 19 16:55:14 2008
> > @@ -1869,7 +1869,7 @@ static int mpeg_decode_slice(Mpeg1Contex
> > }
> > }
> > eos: // end of slice
> > - *buf += get_bits_count(&s->gb)/8 - 1;
> > + *buf += (get_bits_count(&s->gb)-1)/8;
>
> Have you checked what code gcc generates for this /8?? I suspect it's
> a division!! Use >>3 or fix get_bits_count to return unsigned instead
> of int.
Feel free to change it to a shift.
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
No human being will ever know the Truth, for even if they happen to say it
by chance, they would not even known they had done so. -- Xenophanes
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