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

[Michael Niedermayer]

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 ...

[...]
-- 
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
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