Patch for VDPAU version here.

This patch must be applied *after* applying VDPAU patches

Warning: this patch modifies file in both mythtv and mythplugins so you must apply it at the root

Updated with patch #6 and VDPAU patch #20405-2

Original patch: http://cvs.mythtv.org/trac/ticket/5900

This patch generalises the upmix / AC-3 (re)encode functionality. Main thing is that it makes upmix and encode to DD5.1 work.

Also:

* Fix resampler clipping

* Turn on resampler where sr != 48k [1]

* Fix passthru where main dev:subdev == passthru dev:subdev [2]

* Add keybind (Ctrl+U) / OSD menu option to toggle upmixing

* Preserve timestretch across stream changes / upmix toggles

* Small change to freesurround params

[1] Recent versions of ALSA will do this if we don't. The SRC we use is much better quality.

[2] Like my nvidia CK804