[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

Thiago Sousa Santos <thiagossantos> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |1.5.1

--- Comment #13 from Thiago Sousa Santos <thiagossantos at gmail.com> 2015-01-05 21:32:49 UTC ---
commit 50b5d94b2a1dfa702107c9f9203baf6df517f61e
Author: Alex Ashley <bugzilla at ashley-family.net>
Date:   Fri Apr 4 16:45:51 2014 +0100

    hlsdemux: Implement live seeking

    hlsdemux assumes that seeking is not allowed for live streams,
    however seek is possible if there are sufficient fragments in the
    manifest. For example the BBC have live streams that contain 2 hours
    of fragments.

    The seek code for both live and on-demand is common code. The
    difference between them is that an offset has to be calculated
    for the timecode of the first fragment in the live playlist.

    When hlsdemux starts to play a live stream, the possible seek range
    is between 0 and A seconds. After some time has passed, the beginning of
    the stream will no longer be available in the playlist and the seek
    range is between B and C seconds.

    Seek range:
    start          0 ........... A
    later               B ........... C

    This commit adds code to keep a note of the B and C values
    and the highest sequence number it has seen. Every time it updates the
    media playlist, it walks the list of fragments, seeing if there is a
    fragment with sequence number > highest_seen_sequence. If so, the values
    of B and C are updated. The value of B is used when timestamping
    buffers.

    It also makes sure the seek range is never closer than three fragments
    from the end of the playlist - see 6.3.3. "Playing the Playlist file"
    of the HLS draft.

    https://bugzilla.gnome.org/show_bug.cgi?id=725435

commit af78e2501ca02d2f9cf19a2dd4713b46ff64aca0
Author: Thiago Santos <thiagoss at osg.samsung.com>
Date:   Mon Jan 5 17:58:54 2015 -0300

    adaptivedemux: prepare for supporting seeks in live streams

    Add function to allow subclasses to specify seeking range for
    live streams

    https://bugzilla.gnome.org/show_bug.cgi?id=725435

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