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If index < 0, then (size_t) index > SSIZE_MAX.

Since version 3.0.0, applications are supposed to set this when
operating in non-blocking mode. At this point, this seems to only
really affect DTLS though.

This helps detect double-close or other bugs.

otherwise that line would prevent early overriding

Sleep a little and try again instead.

Implementation is broken due to use of
arbitrary reference level instead of
normalized level.
Fallback to not better than libav.
fixes #9629

This was only necessary for interruptible/cancellable name resolution.
This is no longer necessary.

A lock was introduced to signal the flush function when the circular buffer was
empty. We don't need a mutex/cond here, we can sleep for the duration of the
remaining buffer instead. This method is less precise but doesn't introduce a
lock in the render callback.

Also fix a AudioUnit leak in case of error.

Wrap to wrap 80 columns, put "{}" after a new line.

Errors should be handled and not asserted!

Use helpers functions for:
 - AudioObjectGetPropertyData
 - AudioObjectIsPropertySettable
 - AudioObjectSetPropertyData
 - AudioObjectAddPropertyListener
 - AudioObjectRemovePropertyListener

Most blocks contains aligned samples.

Causes out of sync, frame dropping.