[Bug 674085] New: [0.11] GstAdapter's buffer keeps growing indefinitely

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=674085
  GStreamer | gstreamer (core) | 0.11.x

           Summary: [0.11] GstAdapter's buffer keeps growing indefinitely
    Classification: Platform
           Product: GStreamer
           Version: 0.11.x
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: matej.knopp at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=212029)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=212029)
Patch to remove skipped part of adapter's buffer during mapping

Take the following scenario

adapter.push(10 bytes)
for (int i = 0; i < 1000; ++i)
{
  adapter.push(10 bytes);
  adapter.map
  adapter.unmap
  adapter.flush(10 bytes)
}

Here the adapter's head buffer will be 1000 * 10 bytes large, i.e. it will grow
10 bytes during every iteration. 

In my test after few seconds of video playback the buffer of video parser
adapter grew to several megabytes and the reallocations took more CPU cycles
than actual video decoding.

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