[Bug 773073] audioconvert: endian conversion optimization

[GStreamer (GNOME Bugzilla)]

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

--- Comment #4 from Petr Kulhavy <brain at jikos.cz> ---
Created attachment 338099
  --> https://bugzilla.gnome.org/attachment.cgi?id=338099&action=edit
Patch for endian conversion fast-path - version 1

Here is the first attempt, any feedback is appreciated.

There are still two issues I'm trying to resolve:
1) 24-bit does not compile in very efficient code. With -O3 it is 25% slower
than 32-bit and 45% slower than 16-bit. With -O2 it is 60% slower than both
16-bit and 32-bit. So I'm trying to find an algorithm that gcc can optimize
better.

2) The base transform class still allocates buffers for audioconvert, which is
no longer needed. How can I tell it the conversion can be done in place and no
output buffer is needed?

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