[FFmpeg-devel] [PATCH] RealAudio 14.4K encoder

Michael Niedermayer michaelni
Tue May 25 20:01:53 CEST 2010

On Tue, May 25, 2010 at 07:48:23PM +0200, Francesco Lavra wrote:
> On Mon, 2010-05-24 at 02:53 +0200, Michael Niedermayer wrote:
> > On Sun, May 23, 2010 at 08:52:30PM +0200, Francesco Lavra wrote:
> > > I'd say we should go for the fast gain qantization, and in attachment is
> > > an cleaned up patch for it, with code duplication removed.
> > 
> > the attached code looks like float brute
> Yes, it is brute force, but it's the faster version: instead of
> LP-filtering the sum of the 3 codebook vectors for each gain
> quantization value, LP filtering is done only once for each of the 3
> vectors (in floating point) and the search is done with the sum of the
> filtered vectors.

yes and the variant that in addition tries the 5 best of that in integers
and correct rounding produced worse psnr for some files, thats impossible
correct rounding should always be better
so either iam missing something (very possible) or i misremember the scores
or theres a bug

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Democracy is the form of government in which you can choose your dictator
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