Channel coupling is an optional AC-3 feature that increases quality by
combining high frequency information from multiple channels into a
single channel. The per-channel high frequency information is sent with
less accuracy in both the frequency and time domains. This allows more
bits to be used for lower frequencies while preserving enough
information to reconstruct the high frequencies.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

This fixes compilation broken by 6ed3b504Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit 21c90012)

This fixes compilation broken by 6ed3b504Signed-off-by: Mans Rullgard <mans@mansr.com>

This improves the audio quality significantly for stereo source with both the
fixed-point and floating-point AC-3 encoders.
Update acodec-ac3_fixed and seek-ac3_rm test references.

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Consistently apply this rule: the guard name is obtained from the
filename by stripping the leading "lib", converting '/' and '.'  to
'_' and uppercasing the resulting name. Guard names in the root
directory have to be prefixed by "FFMPEG_".

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and then reads the channel_map stuff

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and fix GPL/LGPL version mismatches.

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Fix 2 bit allocation bugs.  One fix enables using a higher bandwidth code.  The other fixes an issue with floorcod=7.

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