[Bug 678402] Device discovery/listing replacement for GstPropertyProbe

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=678402
  GStreamer | gst-plugins-base | 0.11.x

--- Comment #6 from Josh Doe <josh at joshdoe.com> 2012-06-27 20:19:59 UTC ---
I have cases where there may be multiple devices, each of which have multiple
interfaces, however this probably doesn't need any special treatment.

More challenging, is that sometimes I also have to specify some configuration
parameter(s), usually in the form of a configuration file or an enum, to even
be able to get usable data. A good example of this would be decklinksrc, which
has device instance (physical PCIe board), video mode (NTSC/PAL/etc), audio
source (analog/AES), and connection (SDI/HDMI/etc). Perhaps the properties that
configure the device (as opposed to something like num-buffers) could be listed
by the device discovery API.

Also, an indication if a given device is known to be providing valid data. In
other words, whether a camera is actually connected to a given board/port.
Could use enums like _CONNECTED, _NOT_CONNECTED, and _UNKNOWN (too expensive to
check if connected, will have to try manually opening).

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