[Bug 772872] audioconvert: superfluous quantization when converting S24LE to S24LE causing extra CPU load

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772872

--- Comment #7 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Petr Kulhavy from comment #6)
> (In reply to Sebastian Dröge (slomo) from comment #5)
> > So for "same format" we should never ever do any conversion.
> > 
> > For endianness-change-only, we should have a fast-path that does not first
> > blow up the samples to 32/64 bits and then does quantization again just to
> > swap the bytes.
> 
> Exactly, that's what I would expect. Plus the endian conversion should use
> the __builtin_bswap() functions or similar to take the advantage of the
> hardware (not sure if the there are instructions for 24-bit conversion
> though).

We use orc for such things

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