This avoids racing with the audio output thread (if it exists) on the
end date of the mixer input FIFO.

This avoids racing with decoder thread (audio input & mixer) w.r.t. the
FIFO timestamps.

Reported-By: Alessandro (ale5000)

Reported-By: Alessandro (ale5000)

- by default, fullscreen is performed on the same monitor as the one
  where the video is currently being played back.
- support for --qt-fullscreen-screennumber if the user wishes to force
  fullscreen on a given monitor.

This fixes trac #4712. Tested on Linux. Tests needed for Windows.

The audio input drops expired packets before they hit the mixer. Since
we only support a single input per mixer, the mixer check is mostly
redumdant.

Pointed-out-by: Fabian Greffrath <fabian@greffrath.com> (Debian BTS)

macosx: fixed disappearing repeat button images introduced in [8f79caa3e4b56c73c719bfa7c444cccbf203aa19]

Closes #4886

Main reason is that tt has the nicer subtitles support
Broken configurations (looking at you S3 and Matrox) will be able to use
the DirectDraw module.

Unsupported versions:
- Win9x (this is already the case)
- Win XP SP0, SP1
- Win 2000 (all editions)
- Windows 2003 SP0

Supported versions:
- Windows XP SP2, SP3
- Windows 2003 SP1
- Windows Vista, 7 and 2008

Audio volume should now work on !HAVE_FPU. This is untested though.

Both are present in recent nVidia cards. The latter is about the
Aug. 2010 revision of the DxVA2 WMV specification