Patch by Anders Holst:

Patch by Anders Holst:

* Undo "sparse-AP-fix"

 At March 25 a patch was checked in that makes sure that AP:s closer
 than half a second from each other are filtered away. I don't know
 the exact purpose of this fix, but I don't think it is a good idea:
 Besides being the cause of bugs 4 and 5 above, all seek operations
 are based on the AP:s, and it is a pity to cripple the precision
 here. And for example, when cutting movies it is important to be
 able to reach the right GOP boundary. (And the next fix relies on
 all boundaries being available.) (If you wonder, bug 5 was caused by
 a destructive interaction of this with the discontinuity handling.)

* Hit GOP:s somewhat before GOP start

 It turns out that if you jump exactly to the GOP start, then that
 GOP is nevertheless skipped and playback starts from the GOP
 thereafter. However, if you jump to (at least) one frame before the
 GOP start, playback starts from that GOP. I don't know if this is a
 bug in the driver or elsewhere, but the best I can do is this
 workaround: Hit the GOP by jumping to half a GOP length before the
 GOP start. (By scanning the ts file it is of course possible to find
 the exact frame boundaries, but why bother since anywhere between
 the previous GOP start and the previous frame start will do.)
 Similarly, to show the first frame of a GOP, a few more frames must
 be included. Therefore, add half a GOP at the end of each source
 span.

* Jump over discontinuities during AP relative seek

 The above two fixes together *almost* take care of bugs 1 and 2
 above. Now seekRelative(1) moves one forward and seekRelative(-1) one
 backwards. However, at discontinuities they may get stuck. This is
 remedied by an extra if statement to check for discontinuities when
 stepping throught the AP:s in AP relative seek.

* Stop after last source span

 In the function eDVBChannel::getNextSourceSpan there was no code to
 take care of the case when the seeked-to point is after the last
 source span. Currently it just goes on until the movie ends. I have
 added code for this, which takes care of bug 3, and as a fortunate
 bonus effect bug 6 too. (But please check my code here, I hope I can
 use current_offset the way I do, and return 0 size when it should
 stop.)