[FFmpeg-soc] DCA encoder (part 2)

[Bartlomiej Wolowiec]

Hi,
here is the next part of improvement of DCA encoder. Main changes are:
use of scale factors and add constant QUANTIZER_BITS, which determines how 
many bits are used for mantissa.
Now it has also a good quality with 8 bits/sample.
-- 
Bartlomiej Wolowiec
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