[Bug 768852] appsink: add _try_pull_{sample,preroll} with timeout parameter

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768852

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|git master                  |1.9.2

--- Comment #1 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Thanks, pushed with minor changes (add Since markers to doc blurbs, add to API
docs, decrease padding in header, minor code style change re. 'const
gboolean'):

commit ffa9f04bb2072c0a257cbb50177dd208b9ea367b
Author: Tim-Philipp Müller <tim at centricular.com>
Date:   Mon Jul 18 17:26:26 2016 +0100

    tests: appsink: add minimal test for new pull with timeout functions

    https://bugzilla.gnome.org/show_bug.cgi?id=768852

commit c6722c06a040a333188793d7f4403dd983c04815
Author: Joan Pau Beltran <joanpau.beltran at socib.cat>
Date:   Fri Jul 15 13:20:29 2016 +0200

    appsink: add _pull_sample/preroll() variants with timeout

    The _pull_sample() and _pull_preroll() functions block
    until a sample is available, EOS happens or the pipeline
    is shut down (returning NULL in the last two cases).

    This adds _try_pull_sample() and _try_pull_preroll()
    functions with a timeout argument to specify the maximum
    amount of time to wait for a new sample.

    To avoid code duplication, wait forever if the timeout is
    GST_CLOCK_TIME_NONE and use that to implement
    _pull_sample/_pull_preroll with the original behavior.

    Add also corresponding action signals "try-pull-sample"
    and "try-pull-preroll".

    https://bugzilla.gnome.org/show_bug.cgi?id=768852

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