[gst-devel] RFC: dynamic ranks

[in7y118 at public.uni-hamburg.de]

Quoting Steve Baker <steve at stevebaker.org>:

> I don't have a real preference for either approach - I think I lean
> toward a "usable" interface since only a handful of elements will need
> this, and it seems a bit messy to overload ranks with this new meaning.
>
Any approach is fine with me.
 
Just use something different from a boolean. There might be a reason why a 
plugin would like more than 2 values. (Not that I know one right now, but just 
in case.) I don't like limiting me too much.

But it seems right to use an interface for that.

I prefer
guint gst_dynamic_rank_get (GstDynamicRank *element);
where the return value is in the range [0, 100].
You can then just return 0 or 100 in the boolean cases.
And the real rank can be computed by gst_plugin_feature_get_rank (factory) * 
gst_dynamic_rank_get (element) / 100.

Then you just take all elements from Sink/Audio, load them if they implement 
the interface to compute the rank or use the static rank if they don't 
implement the interface and you have your auto plugin selector.