Paul Wilkins 0d284ffed1 Abstract the selection of coefficient context.
This is an initial step to facilitate experimentation
with changes to the prior token context used to code
coefficients to take better account of the energy of
preceding tokens.

This patch merely abstracts the selection of context into
two functions and does not alter the output.

Change-Id: I117fff0b49c61da83aed641e36620442f86def86
2013-02-13 18:56:30 +00:00
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