code ended up selecting the default album scraper for artists

With invalid begin/end times, the for loop in GUIEPGContainer.cpp L#825 (https://github.com/xbmc/xbmc/blob/5f33d290e/xbmc/epg/GUIEPGGridContainer.cpp#L825) loops endlessly, freezing XBMC when the user views the "EPG: Timeline" window. Solve this by adding check for invalid end times.

This mainly applies to several MP4 files where we currently can't reliably detect in which chapter we are when
we perform chapter seeking (probably an ffmpeg bug?). To workaround this make sure current chapter != 0 and
fallback to large stepping where appropriate.

CSoftAE::GetDelay(), CSoftAE::GetCacheTime(), and
CSoftAE::GetCacheTotal() assume in their calculations that m_buffer
contains frames that have sink/encoder frame size. However, m_buffer
actually contains frames in the format received from CSoftAEStream.

This causes varying levels of A/V de-sync depending on other conditions.
On my Linux system I encounter this always when using using HDMI audio
and having the display refresh rate set at 24Hz.

Fix those functions to use the correct frame size.

- fix race in 2 threads consuming the ringbuffer (dvdplayeraudio calls flush and ca thread still pulls frames) by moving the flush to the ca thread instead - fixes crashing when switching tv channels (this was the real issue the 2 reverted commits before wanted to fix...)

- fix regression (stuck ringbuffer after 46min, 62min, 180min - depending on the stream setup). Revert "[AE/CA] - fix a possible overflow in the ringbuffer during readsize calculation (yes we hit this in pvr branch in internalflush - when zapping channels)"

This reverts commit e447c4bb.

Revert "[AE/CA] - ooppps - typo in last commit (note to self - commit on the same host you compiled it)"

This reverts commit 1c7791d9.

Get and use correct (removable://) file record from database Fixes DVD resume after resume details already exist

sync add-ons * https://github.com/opdenkamp/xbmc-pvr-addons/pull/178 * https://github.com/opdenkamp/xbmc-pvr-addons/pull/191 * https://github.com/opdenkamp/xbmc-pvr-addons/pull/192 * https://github.com/opdenkamp/xbmc-pvr-addons/pull/193