[Bug 773073] audioconvert: endian conversion optimization

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773073

Petr Kulhavy <brain at jikos.cz> changed:

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--- Comment #18 from Petr Kulhavy <brain at jikos.cz> ---
Created attachment 338215
  --> https://bugzilla.gnome.org/attachment.cgi?id=338215&action=edit
Patch for endian conversion fast-path - version 2

Here is a modified version of the endian conversion patch. It contains:

* 64-bit support
* assembly code removed
* added "clever algorithm" for 24-bits, which processes 3x 32-bit in one cycle.
Due to worse performance with -O3 I've put it into #if 0 section
* using GST_AUDIO_INFO_BPS(info)

I'm too unfamiliar with ORC to do the the ORC implementations. They need to
write dedicated conversion functions for 24 bits, which I don't know how to
write.

The next thing, which I believe would actually bringing more performance gain,
is to allow endian (and later also signed) conversion to run in place. I will
do this in a separate patch.

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