Re: [SoX-users] endlessly repeating self-built waveform ?

[Doug L. <dg...@dl...>]

On Sat, Dec 01, 2012 at 09:40:15PM -0800, Sergei Steshenko wrote:
> ----- Original Message -----
> > From: Doug Lee <dg...@dl...>
> > To: Sergei Steshenko <ser...@ya...>; sox...@li...
> > Sent: Sunday, December 2, 2012 7:32 AM
> > 
> > On Sat, Dec 01, 2012 at 07:36:31PM -0800, Sergei Steshenko wrote:
> >>  Hello,
> >>  suppose I've build a sound file (for simplicity, a .wav one) which 
> > contains just one period of a periodic function.
> >>  And the shape of that function is according to my needs, i.e. it's not 
> > a shape readily available from 'sox'.
> >>  Is there a way to endlessly repeat (infinite loop) playing of that single 
> > period without gaps ? As if 'sox' is that special periodic function 
> > signal generator.
> > 
> > I think the `repeat' option is what you want, though whether it's
> > gapless for real-time use may depend on your hardware, and it's not
> > infinite:
> > 
> > play file.wav repeat 99999
> > 
> > may be gapless on fast hardware, but
> > 
> > sox file.wav loop999.wav repeat 999
> > 
> > should be gapless in its creation of loop999.wav.
> 
> So, if instead of 1 period I have, say, 100000 periods (several seconds), and taking into account that modern OSes cache files in RAM, should I expect rarer gap occurences ?

I'd say try and see what you get. For a file-to-file (SoX command)
operation, you shouldn't get any gaps at all. For a file-to-audio
(play command) operation, I can only tell you I think the results can
depend on hardware. Others may have more concrete input on that point.


-- 
Doug Lee                 dg...@dl...                http://www.dlee.org
SSB BART Group           dou...@ss...   http://www.ssbbartgroup.com
"All these years, the people said, 'He's acting like a kid.'
He did not know he could not fly, so he did."
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