Implemented audio track menu

HISTORY

@@ -3160,7 +3160,7 @@ Video Disk Recorder Revision History
   right day of week for timers in the future.
 - Some improvements to cPoller (thanks to Marco Schl<68><6C>ler).
 
-2004-12-26: Version 1.3.18
+2005-01-02: Version 1.3.18
 
 - Removed an unused variable from cTimer::GetWDayFromMDay() (thanks to Wayne Keer
   for reporting this one).
@@ -3251,3 +3251,17 @@ Video Disk Recorder Revision History
   Zocholl for pointing out this problem).
 - Added cDevice::mutexReceiver to avoid a race condition when attaching/detaching
   receivers from different threads.
+- The new remote control button "Audio" can be used to switch between different
+  audio tracks. The "Green" button in the "Main" menu has been changed from "Language"
+  to "Audio", since it now also controls switching between normal and Dolby Digital
+  audio tracks.
+- The description of the audio tracks is now taken from the "component descriptors"
+  that are broadcast in the EPG data. However (as no big surprise), not all channels
+  actually provide useful data here, so there are now some additional EPG bugfixes,
+  which can be activated by setting the "EPG bugfix level" to 3.
+- The format of the 'epg.data' files has been extended by the new tag 'X', which
+  contains the stream components of an event (see man vdr(5) for details).
+- The cStatus class now has the new member function SetAudioTrack(), which can be
+  used to get notified when the audio track has been switched.
+- Skins need to implement the new cSkinDisplayTrack class to display the audio
+  track menu.