[Bug 704691] New: input-selector: active pad not notified

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704691
  GStreamer | gstreamer (core) | 1.1.2

           Summary: input-selector: active pad not notified
    Classification: Platform
           Product: GStreamer
           Version: 1.1.2
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=249817)
 View: https://bugzilla.gnome.org/attachment.cgi?id=249817
 Review: https://bugzilla.gnome.org/review?bug=704691&attachment=249817

input-selector: fix missing pad activation notification

A new active pad might not be notified in some cases, which results in the
current track number not being set in playbin.

The active-pad notification is only sent in the chain and sink_event functions,
and only when the buffer or event that triggered the active pad selection is
from the newly activated pad. So in the other case the notification will never
be sent.

For example:

<inputselector2:sink_1> received event stream-start event: ...
<inputselector2> Activating pad inputselector2:sink_0
<inputselector2:sink_0> received event stream-start event: ...

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