[Bug 648181] New: pulsesrc should reinit caps if we need to

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=648181
  GStreamer | gst-plugins-good | git

           Summary: pulsesrc should reinit caps if we need to
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bug-track at fisher-privat.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


In some situations, for example empathy/telepathy, we do not know what caps do
we need to initiate pulsesrc. We even do not know what codec will be used at
what sample rate.

Possible codecs variations are:
audio/SPEEX:8000; audio/SPEEX:16000; audio/AMR; audio/G729; audio/ILBC; ... may
be CELP too.

To initiate one of this codec we should initiate the source (vor example
pulsesrc). Pulsesrc will automatically set 44100Hz with two channels. After
Codec is started we will need 8000 or 16000 Hz with one channel (May be some
time in the future 2 as well?). The  curious thing, my external webcam/mic
provide only 16000 Hz. So at end result CPU is really besy with resampling:
mic(16000Hz/1channel)->pulsesrc(44100/2ch)->speexenc(16000/1ch).

The fact it resamples two chennels insted of one make things worse.

=====================================================================

So my wish is to add some kind of reinit call to pulsesrc, after speexenc (or
other codec) is linked.

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