[Bug 747005] gstaudioconvert: avoid floating point calculations when mixing integer-formatted channels

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747005

Sebastian Dröge (slomo) <slomo at coaxion.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|git master                  |1.5.1

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
commit b2db18cda2e4e7951655cb2a34108a8523b6eca9
Author: Bernhard Miller <bernhard.miller at streamunlimited.com>
Date:   Mon Mar 30 11:24:46 2015 +0200

    audioconvert: avoid float calculations when mixing integer-formatted
channels

    The patch calculates a second channel mixing matrix from the current one.
The
    matrix contains the original values * (2^10) as integers. This matrix is
used
    when integer-formatted channels are mixed.

    On a ARM Cortex-A8, single core, 800MHz this improves performance in a
    testcase from 29s to 9s for downmixing 6 channels to stereo.

    https://bugzilla.gnome.org/show_bug.cgi?id=747005

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