[gstreamer-bugs] [Bug 525833] [halaudiosrc] unable to get mic USB working with gnome-sound-properties

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-good | Ver: 0.10.x

Tim-Philipp Müller changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED
            Summary|Unable to get mic USB       |[halaudiosrc] unable to get
                   |working with gnome-sound-   |mic USB working with gnome-
                   |properties                  |sound-properties
   Target Milestone|HEAD                        |0.10.8




------- Comment #8 from Tim-Philipp Müller  2008-04-05 12:00 UTC -------
Right, this is caused by this code snippet in hal.c:

    if (device == 0) {
      /* handle default device specially to use
       * dmix, dsnoop, and softvol if appropriate */
      string = g_strdup_printf ("%s device=default:%d", element, card);
    } else {
      string =
          g_strdup_printf ("%s device=plughw:%d,%d", element, card, device);
    }


>From bug #329106: "An additional change I've integrated is to use the
"default:X" PCM/capture device instead of "plughw:X,Y" if device 0 is
requested. This avoids the problem that dmix/dsnoop set-up by alsa-lib get
ignored."

It seems to me that this makes a lot of assumptions about the exact alsa setup,
and is generally dodgy. DMix should be advertised as an option alongside direct
hardware access instead of things being changed under the hood here. We can't
assume that there's a default device set up or that it points to dmix.

Anyway, I think the best quick-fix/hack is to only change the device string in
the above way for playback devices, but not for capture devices:

 2008-04-05  Tim-Philipp Müller  <tim at centricular dot net>

        * ext/hal/hal.c: (gst_hal_get_alsa_element):
          Don't munge device string to 'default:x' for capture devices.
          Fixes #525833.


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