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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Bernhard Miller <bernhard.miller at streamunlimited.com> ---
I tested it on a Cortex-A8, single core, 800MHz. Input was a 96kHz flac file
with 6 channels. 

The time used for my primary test case, this launch line:

gst-launch-1.0 filesrc location="flac_96000khz_16bit_6ch.flac" ! decodebin !
audioconvert dithering=0 ! "audio/x-raw,channels=2" ! fakesink sync=false

was reduced from ~29 seconds to ~9 seconds.

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