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List:       sox-devel
Subject:    Re: [SoX-devel] effect to write waveforms to image file
From:       Thor Andreassen <ta () toggle ! be>
Date:       2012-05-30 11:29:06
Message-ID: 20120530112906.GA18761 () toggle ! be
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On Tue, May 29, 2012 at 07:29:06PM +0200, Ulrich Klauer wrote:
> Thor Andreassen <ta@toggle.be>:
> 
> > The thing is, the data should be
> > compressed somehow without loosing too much information ie. local minima
> > and maxima, and the compression should take into account the number of
> > pixels that the user has available, so maybe something like this:
> > input  : S = [buffer of samples]
> > output : maxmin(S)
> > Where the buffers size is = samples / horizontal-pixels, and where
> > maxmin might be plotted in the same column. AFAICS a sox effect is a
> > pretty good and useful place for such a solution, as you proposed.
> 
> I'd agree that an effect that computes minimum or maximum values over  
> configurable blocks of samples might be a useful addition. However,  
> plotting directly (i.e. an effect that, like "spectrogram", writes out  
> a PNG file, but with a waveform) seems to me outside the scope of an  
> audio utility.

I've been meaning to write something like that for awhile, maybe it
should also support computing spectral and spectrogram information ...

-- 
best regards
Thor Andreassen

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