[FFmpeg-devel] [PATCH] AAC decoder

Balatoni Denes dbalatoni
Wed Apr 9 20:35:23 CEST 2008


Wednesday 09 April 2008 10:00-kor Andreas ?man ezt ?rta:
> I thought we had an understanding that I could just 'leave' the
> LTP / SSR code as-is without any modifications (as we've discussed
> on the soc-list). I don't intend to fix it anytime soon unless
> someone come up with a long list of samples they really want
> to have supported. Perhaps it's better to rip it out after all?
> If so i'll try to make some clean cuts to it could be revived
> by extracting patches from the soc-rep.
> Also, Once we get SBR / PS this old legacy will probably make even
> more damage than good. This is just speculation though...

Probably a stupid question - but I haven't been following AAC very much - but 
do you mean that LTP is not used much nowadays (or anytime before)?
It would be logical, as I myself have found a few years ago, that this mdct 
coefficient temporal prediction is not worth much - it's shameless plug, but
I have tried a supposedly more efficient mdct coefficient temporal prediction 
with vorbis in the past, and it didn't improve compression too much (or at 
all in some cases), see http://web.interware.hu/rudas/  .


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