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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #50 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
(In reply to Ilya Konstantinov from comment #47)
> This seems to happen with armv7 but didn't happen on arm64 (?!).

Actually, this happens on both armv7 and arm64. It's just that on arm64, 
gst_audio_quantize_quantize_signed_tpdf_none is somehow devilishly efficient
(0.9%) and on armv7 very inefficient (22.6%).

I don't understand what could cause such a difference.

In any case, for osxaudio we can:
* add a property that disables preferred caps, or
* expect apps (e.g. OpenWebRTC) to know that osxaudiosrc is capable of
conversion/resampling, and either avoid inserting audioconvert/resample or add
another filter to force osxaudiosrc to a specific format

Arun, please advise (here or on IRC).

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