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>

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.

Originally committed as revision 26271 to svn://svn.ffmpeg.org/ffmpeg/trunk

Passing an explicit filename to this command is only necessary if the
documentation in the @file block refers to a file different from the
one the block resides in.

Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk

Original patch by Justin, updated and resubmitted by
Christophe Gisquet, christophe D gisquet A gmail

Originally committed as revision 22734 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19501 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19498 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 19496 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 18888 to svn://svn.ffmpeg.org/ffmpeg/trunk

dequantization 24-bit in a separate commit.

Originally committed as revision 18887 to svn://svn.ffmpeg.org/ffmpeg/trunk

simpler and also fixes a bug in GAQ dequantization.

Originally committed as revision 18860 to svn://svn.ffmpeg.org/ffmpeg/trunk

Otherwise doxygen complains about ambiguous filenames when files exist
under the same name in different subdirectories.

Originally committed as revision 16912 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 15818 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 15812 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 15515 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 15003 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 14958 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 14953 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 14952 to svn://svn.ffmpeg.org/ffmpeg/trunk

the E-AC-3 decoder.

Originally committed as revision 14527 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 14523 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 13716 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 13715 to svn://svn.ffmpeg.org/ffmpeg/trunk