[vlc-devel] [PATCH WIP 1/2] add pitch shift audio filter

[Valentin Deniaud]

Hi,

scaletempo adjusts tempo while preserving pitch. Now, wouldn't it be
trivial to tweak the code a bit so that it does the opposite, eg ajust
pitch without changing tempo, which is what this new filter does ? I
don't understand all the magic behind the algorithms used so I don't
know for sure.

What I found out however, is that scaletempo had been ported from
GStreamer, and is still in use for tempo change, while for pitch
shifting, GStreamer uses SoundTouch. Hence, putting aside the
possibility of a bad design choice on GStreamer's part, I assumed trying
to achieve pitch shifting with scaletempo was not worth it.

On 08/19/2017 03:19 PM, Rémi Denis-Courmont wrote:
> Hello,
>
> Possibly stupid question but: Isn't that the same thing that the
> scaletempo filter already does?
> -- 
> Rémi Denis-Courmont
> Typed on an inconvenient virtual keyboard
>
>
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