[Bug 725435] hlsdemux: enable seek for live streams

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725435
  GStreamer | gst-plugins-bad | git

A Ashley <bugzilla> changed:

           What    |Removed                     |Added
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 Attachment #271722|0                           |1
        is obsolete|                            |

--- Comment #8 from A Ashley <bugzilla at ashley-family.net> 2014-04-04 15:55:37 UTC ---
Created an attachment (id=273592)
 View: https://bugzilla.gnome.org/attachment.cgi?id=273592
 Review: https://bugzilla.gnome.org/review?bug=725435&attachment=273592

enable seek for live HLS streams

This patch replaces the previous one. Two defects were found with the previous
patch:
1. The time offset used a 32bit int, which overflows when playing for more than
2^31 nanoseconds
2. After a seek, the timestamps attached to the buffers pushed from hlsdemux
were incorrect if the zero time seek position was no longer available.

This patch fixes those two defects and has been re-based to current git master
head.

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