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

[GStreamer (GNOME Bugzilla)]

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

Arun Raghavan <arun at accosted.net> changed:

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--- Comment #29 from Arun Raghavan <arun at accosted.net> ---
Review of attachment 298926:
 --> (https://bugzilla.gnome.org/review?bug=743758&attachment=298926)

This one looks a bit tricky. From the documentation at
https://developer.apple.com/library/ios/documentation/AudioUnit/Reference/AUComponentServicesReference/index.html#//apple_ref/c/func/AudioUnitInitialize:

"""
Usually, the state of an audio unit (such as its I/O formats and memory
allocations) cannot be changed while an audio unit is initialized. 
"""

If I'm reading this right, we can't really set a different format after
initialising, which breaks the semantics of open (viz. open the device, but
don't fixate the format, which happens at acquire time).

We might need to do an initialise and uninitialise just for probing, to deal
with this.

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