flac dev - Sep 2004 - possible format change (was: flac can occasionally be worse than shorten)

> > I've never come across a sample like this which is
> > why I thought it wasn't useful to add that
> > functionality to FLAC... maybe if this is a common
> > practice I should put it in.
> ...
> I've
> compressed around 50 albums with flac and found 1
> where the LSB is 0. Even
> if it's 1 in 200, that's going to be lots of cases
> where shorten out
> performs it?
>   But, hey I program too and this seems like a pain
> in the arse to code
> just for these limited cases
actually, it's pretty easy to code and not even a
real speed penalty, but I would have to find a place
in the stream header for the bitshift #, which is
pretty tight right now.  if I can I will probably
add it.

Josh


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On Tue, 20 Feb 2001, Josh Coalson wrote:
> actually, it's pretty easy to code and not even a
> real speed penalty, but I would have to find a place
> in the stream header for the bitshift #, which is
> pretty tight right now.  if I can I will probably
> add it.
It could also be a time to add a space in the header for this?
  Cheers.

Mark Powell - UNIX System Administrator - The University of Salford
Academic Information Services, Clifford Whitworth Building,
Salford University, Manchester, M5 4WT, UK.
Tel: +44 161 295 5936  Fax: +44 161 295 5888  www.pgp.com for PGP key

> > actually, it's pretty easy to code and not even a
> > real speed penalty, but I would have to find a place
> > in the stream header for the bitshift #, which is
> > pretty tight right now.  if I can I will probably
> > add it.
> 
> It could also be a time to add a space in the header for this?
> 
Yep, I didn't forget!  It will be in 0.9.  I still have the tracks
you submitted for testing this out.

Josh

Interesting P.S.  I think the reason it was is shorten in the 
first place is actually to make WAVE processing easier, since
that spec says to right pad samples with zeroes since samples
are stored on byte boundaries.  In other words, a 12 bit sample
is stored as a 16-bit sample with 4 LSB zeroes.  It just happens
to be useful in the tracks you ran across.


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