[LAD] Re: Help with resampling algorithm

Hi Marco,

On 13.04.24 16:26, Marco Castorina wrote:
> Hi everyone,
>   I am hoping this is the right place to post this question.
>
> I am trying to implement the resampling algorithm as described in this
> paper: https://ccrma.stanford.edu/~jos/resample/resample.pdf
>
> I managed to construct the h (windowed sinc) table, and I have
> implemented the loop. I am having a hard time to compute the eta
> interpolation factor and the l index index for the h table. The "fixed
> point" implementation of the paper is a bit confusing to me.
>
> Looking at figure 7 in the paper, I think the interpolation factor needs
> to be computed between the h entries instead of between the original
> samples. However I don't understand how to compute the starting point
> (h(l)).
>
> I have just started working with audio code, so I might be
> misunderstanding something fundamental about the paper.

if the primary purpose is not learning/education, then I would highly
recommend to use an existing (and typically highly optimized) library,
e.g. libsamplerate or zita-resampler:

http://www.mega-nerd.com/SRC/

http://kokkinizita.linuxaudio.org/linuxaudio/zita-resampler/resampler.html

Best,

Giso

>
> I have coded a prototype which is shared here:
> https://gist.github.com/theWatchmen/746f35c349748525b412cfd9466608ce
>
> Apologies in advance if this is not the right forum.
>
> Marco
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