----- Original Message -----
Sent: Wednesday, February 25, 2009 9:20
PM
Subject: [Csnd] Re: Re: Re: Re: editing
audio to zero crossings from the command line.
>Have you considered thinking about an orc that analyzes each sample
of
>an audio file and call it a "zero crossing" when the scalar
pressure
>values to represent amplitude change signs? (ie. from positive
to
>negative and vice-versa)
Sure haven't.
>Perhaps the source code to the waveset opcode may be a good place
to
>start. In the abstract, to answer your question I think Csound
is
>probably the best tool for this.
I'll be darned. I thought this sounded like a relatively obvious thing
someone would have put together by now, and this whole "looking at code' thing
after one month of recreationally working at Csound and having taught myself
some very entry-level C (that's it.) is a bit intimidating. I'll give it a
shot, though.
>Do you write python?
>It's not a problem to pull the file into
a numpy array and search /edit to your heart's content.
>D.
Sure don't. I had a vague sense that python was a little
cpu-heavy, but again, I'll have a look.
It just seemed with all the SoX, ecasound, etc., there would
be something (perhaps even a simple ladspa plugin?) written to do this. Did
people just not make looping oscillators back in the day?
Greg
On Thu, Feb 26, 2009 at 9:27 AM, DavidW
<vip@avatar.com.au> wrote:
Do
you write python?
It's not a problem to pull the file into a numpy array
and search /edit to your heart's content.
D.
On 26/02/2009, at 11:12 AM, Greg Schroeder
wrote:
I
am not sure about audacity
. . . "from the command line" . . .
. . .
"doesn't need x11" . . .
peak and soundtrack
" . . .gpl'ed . . .
"
" . . . command line . . ."
I know there are myriad ways to
find zero crossings in software, Peiman. I want to find and edit to them
without a graphical interface to accomodate a relatively sluggish
computer.
Greg
2009/2/26 Greg Schroeder <gmschroeder@gmail.com>:
> Hey all,
> Does
anyone here edit audio for looping oscillators from the command
line?
> I'm currently trying to cobble together a workflow that
doesn't need x11,
> and I don't know how to find zero crossings
without "looking" at the sound.
> As always, gpl'ed and
currently-maintained is best . . .
>
Greg
David
Worrall.
- Experimental Polymedia: www.avatar.com.au
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Australian research
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- Sonic
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