[Bug 775445] adaptivedemux: Fix deadlock during transition from track disable to enable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775445

Seungha Yang <sh.yang at lge.com> changed:

           What    |Removed                     |Added
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 Attachment #341304|reviewed                    |none
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 Attachment #341304|0                           |1
        is obsolete|                            |

--- Comment #14 from Seungha Yang <sh.yang at lge.com> ---
Created attachment 347349
  --> https://bugzilla.gnome.org/attachment.cgi?id=347349&action=edit
inputselector: Always proxy position/duration query

active-pad switch causes reconfigure event with lock taken,
and upstream element might query the current position or duration
before returning the reconfigure event.
Meanwhile, gst_input_selector_get_linked_pad() is used to get srcpad
inside of default query handle, and it takes also lock.
Since inputselector is still locked by active-pad switch, and so the query
cannot be handled further.

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