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[yannig]

What do you mean by "lossless interpolation"?

same thing than interpolation used in dac chips, or interpolator chips :
keep all the original samples and only calculate intermediate samples.

And especially not to recalculate the whole flow, as in the SRC (which is not lossless).

@yannig moOde makes use of the existing sox (the soxr library) resampler.

You can find a lot of information about the (internal) working of this resampler, for example:

• https://soundcheck-audio.blogspot.com/20...id-it.html
  
• http://leute.server.de/wilde/resample.html
  
• http://archimago.blogspot.com/2018/11/mu...touch.html
  

The great thing about sox is that you can download the sox commandline tool and analyse the output yourself.

Thanks for the links, but I do not found what I'm looking for there.


 I do not like the sound of the Sox resampler, and I ALWAYS preferred interpolators integrated into dacs, or external DF170x (matter of taste, shall we say).
And in addition there are different interpolation filters in modern dacs.


Perhaps I do not test all the Sox feature, and it is possible to make it lossless.
but SRC are usually not lossless, it really seems that it is still the case for Sox (and I found nothing about lossless Sox on the whole web).