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

[Robert Swain]

2008/8/4 Kostya <kostya.shishkov at gmail.com>:
> 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.

How much psychoacoustic stuff has been implemented for the vorbis encoder?

Rob