Re: [SoX-devel] effect to write waveforms to image file

[Ulrich K. <ul...@ch...>]

Thor Andreassen <ta...@to...>:

> 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.

Ulrich