[Bug 772864] audioconvert: mask calculation optimization

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772864

--- Comment #4 from Petr Kulhavy <brain at jikos.cz> ---
(In reply to Tim-Philipp Müller from comment #2)
> Please feel free to propose a patch, just keep in mind that it's likely not
> worthwhile to do anything that increases the complexity or maintenance
> burden here since that function is only ever called during negotiation and
> the performance impact here is likely pretty much ~0 already in practice
> anyway, so it seems unlikely to me that there'd be any performance gains
> here, we just get to feel better about using a more clever algorithm ;)

See my proposal in comment 1.

I agree with you that it's affecting just the setup-phase, which is not as
critical as playback. However it's still worth to reduce the
initialization/set-up time in an obvious case like this: 64 loop cycles instead
of 4k loop cycles ;-)

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