[Bug 743912] New: pulse audio sink report server is dead when doing audio track switching

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743912
  GStreamer | gst-plugins-good | 1.4.1

           Summary: pulse audio sink report server is dead when doing
                    audio track switching
    Classification: Platform
           Product: GStreamer
           Version: 1.4.1
        OS/Version: Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: lj.qfy.sh at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


This issue is reproduced by switch two audio track with different sample rate
repeatly, finally will report:" Error: Disconnected: Bad state"

It's from function gst_pulsering_is_dead().
The reason is two threads race condition, when switch two audio track with
differnt caps, audio base will set new caps to pulsesink, then two threads will
have race condition.

The first thread is gst_pulsesink_get_time(), the other is
gst_audio_base_sink_setcaps(). In gst_audio_base_sink_setcaps, it will release
audio ring buffer, which will finally release pulse audio stream. But in
gst_pulsesink_get_time(), it will call gst_pulsering_is_dead() to check if
pbuf->stream is still valid, if invalid will report server is dead.

So need to check if pa stream is still alive in gst_pulsesink_get_time().

Patch is attached.

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