[Bug 787367] parsebin: Emit 'drained' only for the top-level chain

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787367

Edward Hervey <bilboed at bilboed.com> changed:

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--- Comment #2 from Edward Hervey <bilboed at bilboed.com> ---
Comment on attachment 359276
  --> https://bugzilla.gnome.org/attachment.cgi?id=359276
parsebin: Emit 'drained' only for the top-level chain

commit 92e88768443a21eab5d2dd6bc7a318c9b46e54f8 (HEAD -> master, origin/master,
origin/HEAD)
Author: Edward Hervey <edward at centricular.com>
Date:   Wed Sep 6 16:50:31 2017 +0200

    parsebin: Emit 'drained' only for the top-level chain

    Instead of emitting 'drained' whenever every single chain is drained
    (which would result in plenty of signal emission, and would also
    occur when switching groups), only emit it when the top-level chain
    is drained.

    Furthermore, mark unknown (and therefore unexposed) pads as drained
    since we'll never get EOS on them.

    https://bugzilla.gnome.org/show_bug.cgi?id=787367

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