[FFmpeg-soc] [soc]: r3010 - in aacenc: aacenc.c aacpsy.c aacpsy.h

[Kostya]

On Mon, Aug 04, 2008 at 07:58:56PM +0200, Michael Niedermayer wrote:
> On Mon, Aug 04, 2008 at 06:43:23PM +0200, kostya wrote:
> > Author: kostya
> > Date: Mon Aug  4 18:43:22 2008
> > New Revision: 3010
> > 
> > Log:
> > Audio preprocessing for better compression
> [...9
> > +// low-pass filter declarations and code
> > +#define IIR_ORDER 4
> > +
> > +/**
> > + * filter data for 4th order IIR lowpass Butterworth filter
> > + *
> > + * data format:
> > + * normalized cutoff frequency | inverse filter gain | coefficients
> > + */
> 
> A lowpass filter should be advantaneous for all MDCT based codecs not just
> AAC, but then i guess that is true for the whole psychoacoustic stuff ...

I've already though of moving that into separate file.
Anyway, after I finish that I will think on how to apply psychoacoustics
to other codecs.
 
> [...]
> -- 
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
> 
> I wish the Xiph folks would stop pretending they've got something they
> do not.  Somehow I fear this will remain a wish. -- Måns Rullgård