[Bug 743758] osxaudiosrc supports only 44100 sample rate on iOS

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=743758

--- Comment #41 from Arun Raghavan <arun at accosted.net> ---
(In reply to Ilya Konstantinov from comment #36)
> I've hacked gst_core_audio_probe_caps to report 9 channels and tried playing
> a 5.1 test file.
> 
> Result: HAL maps LEFT to LEFT, RIGHT to RIGHT, and omits all other channels
> (e.g. REAR LEFT is not heard at all).
> 
> I haven't tested with iOS due to the cumbersomeness of running things on it
> -- might do it later -- but I think this tells us that the AU only performs
> simple reordering, omitting channels and inserting silence channels.

In this case, I we should report exactly what the sink or source supports and
not try to use anything else. If the channel count or configuration doesn't
match, it _should_ be remapped to match the actual output, and if that's not
happening, we should let negotiation cause an audioconvert to be used for this
if present (or else fail entirely).

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