* Martin Hermant <martin.herm...@gmail.com> [2017-02-10 10:00]:
> hi guys,
> we are currently developing an audio looper (soon to be released in
> opensource!)
> I’m facing the classical textbook case problem of glitch/pop free looping
>
> Problematic:
> loops have a defined number of sample (can’t change as it is bound to tempo)
> looping point need to be glitch free (no pop due to sudden sample variation
> between end and beginning of loop)
> need to keep simple playback code ,i.e best if the buffer is processed once
> then read « normally » (with less possible conditional cases handling these
> pops in audio callback)
>
> fades in / out is a simple solution but create fake transient at loop points
> on sustained sounds
>
> Solution implemented so far:
> -classic fade in fade out
> - zero pad befor and after first and last zero-crossing -> still got pops if
> no fade
>
> Solution I can think about :
> fade in beginning of loop before end point (complexifies playback code,
> different case when loop need to stop at end)
Read audio from buffer with two playheads and crossfade between them.
See http://msp.ucsd.edu/techniques/v0.11/book-html/node36.html and the
next two pages therein for details.
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