[Bug 703267] New: Need an element to mix text streams

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703267
  GStreamer | gst-plugins-base | git

           Summary: Need an element to mix text streams
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: self at brendanlong.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


For WebKit, we need an element that can be used as the text-stream-combiner in
playbin. It needs to:

  * Combine multiple text streams into one.
  * The pads need to:
      * Allow us to activate and deactivate streams.
      * Expose tags.

Adder is similar to what we need, but it waits until it gets buffers on all of
the pads, and that could cause problems in text streams, since we may not have
buffers on every pad. We also don't want to merge the buffers, we just want to
forward all of them.

I'm starting on an element I'm calling "textmixer" for now (I'm open to better
names, maybe "bufferforwarder" or "rawstreamcombiner" or something), but I
wanted to make sure I'm not missing an obvious easier way to handle this.

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