[Bug 712782] New: Require a feature to display buffered status when using push source

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=712782
  GStreamer | gst-plugins-good | unspecified

           Summary: Require a feature to display buffered status when
                    using push source
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: justin.joy.9to5 at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


The original question was about how to display buffer status. 

http://lists.freedesktop.org/archives/gstreamer-devel/2013-September/042771.html

Then, firstly, I suggested a proposal to accumulate all bytes inside of each
element by a certain query. 

http://lists.freedesktop.org/archives/gstreamer-devel/2013-November/043983.html

After prototyping, I found my first suggestion was wrong because it would make
big burden to each element.



Finally, I found if the upper layer of gstreamer pipeline has content-length,
read-position, and average bitrate, it can estimate the buffer status during
playing time. To get these information, it is only required to expose internal
monitoring data in case of souphttpsrc. 

QUERY_POSITION is about current playing, read-position is about a position
where it downloads. If src provides its read-position, the upper layer can
display how much buffer is fulled like youtube player does.

I know more general approach would be better, but I found that other cases like
mms  doesn't have similar internal data. It means that it's hard to pursue
general way in this step.

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