Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

The feedback factors for the timefilter are directly computed from
the expected period. This commit changes the init function to accept
the period itself and compute the feedback factors internally,
rather than having all client code duplicate the formulas.

This commit also actually fixes the formulas: the current code had
sqrt(2*o), but the correct formula, both theoretically and according
to experimental testing, is sqrt(2)*o.

Furthermore, it adds an exponential to feedback factors larger than
1 with large periods.

It's only used in the JACK device.

Fixes linking shared lavd with JACK enabled.

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

Originally committed as revision 17858 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 17845 to svn://svn.ffmpeg.org/ffmpeg/trunk

avoids calling them in the wrong order.

Originally committed as revision 17841 to svn://svn.ffmpeg.org/ffmpeg/trunk

No change in performance if they do not vary.

Originally committed as revision 17840 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 17838 to svn://svn.ffmpeg.org/ffmpeg/trunk