When is the channel-mask  not set? I can't seem to find a case where it fails. I also think the proper fix is to make all elements set the channel-mask properly.

Perhaps we should make it mandatory for 1+2 channels as well then?

Is this outdated?

I'm not sure I understand what the issue is here. gst_audio_ring_buffer_parse_caps() does this:

  if (g_str_equal (mimetype, "audio/x-raw")) {
    if (!gst_audio_info_from_caps (&info, caps))
      goto parse_error;
    ...
  }

and gst_audio_info_from_caps() does this:


  if (!gst_structure_get (str, "channel-mask", GST_TYPE_BITMASK, &channel_mask,
          NULL)) {
    if (channels == 1) {
      position[0] = GST_AUDIO_CHANNEL_POSITION_MONO;
    } else if (channels == 2) {
      position[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
      position[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
    } else {
      goto no_channel_mask;
    }
  }

So what's going wrong where?

Appears to be obsolete. If not, I'm sure someone will file a new bug.