Subject: Re: [linux-audio-dev] [ann] pvoc-0.1.0, caps-0.1.11
From: Erik de Castro Lopo (erikd-lad_AT_mega-nerd.com)
Date: Thu Mar 25 2004 - 00:06:59 EET
On Wed, 24 Mar 2004 22:09:46 +0100 (CET)
Tim Goetze <tim_AT_quitte.de> wrote:
> [Jesse Chappell]
>
> >Tim Goetze wrote on Wed, 24-Mar-2004:
> >
> > > [Jesse Chappell]
> >
> > > >The stretch program was not properly clamping the output from
> > > >-1.0 -> 1.0 yielding to terrible cracks upon writing as 16bit
> > > >wave files when the output is clipped. The fact that non-clipping
> > > >(but very close to) input yielded clipping output is another issue,
> > > >but not crucial.
> > > >
> > > >I've attached a patch that fixes the problem.
> > >
> > > applied, thanks.
> >
> >I just realized that you may not want to clamp if your output
> >is a 32 bit float or double, as it is fully capable of handling
> >the value as produced. For instance, if (well, when) we suck this
> >algorithm into ardour we don't need to clamp, as our internal
> >format is float.
>
> true. i'll make it an option.
Correct me if I'm wrong, but isn't clipping only a problem when
converting to integer PCM sound file. If that is the case, you
can leave the data unclipped and let libsndfile do the clipping
by using this:
http://www.mega-nerd.com/libsndfile/command.html#SFC_SET_CLIPPING
Erik
-- +-----------------------------------------------------------+ Erik de Castro Lopo nospam_AT_mega-nerd.com (Yes it's valid) +-----------------------------------------------------------+ "In my opinion, shareware tends to combine the worst of commercial software (no sources) with the worst of free software (no finishing touches). I simply do not believe in the shareware market at all." -- Linus Torvalds
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