JACK2 will print error messages to stderr if it fails to connect to a server.
Users who don't normally use JACK but have the client lib installed will get
those messages even though OpenAL Soft will continue on to find a working
backend without trouble. So to avoid it, set an error message handler that'll
log them as warnings.
This isn't that great because there's no way to tell whether the error messages
are due to the server not running, or some other problem. And it resets the
callback to the default afterward even if it may have been set to something
else before. JACK2, which is what needs this workaround in the first place,
doesn't export the jack_error_callback pointer to properly save and restore it.
Not that this really changes anything since the CoreAudio backend doesn't honor
the ALCdevice's buffer metrics, nor accurately report the device's actual
metrics. But it clears up warnings from a non-multiple-of-four update size if
the sample rate causes it to change.
Currently incomplete, as second- and third-order output will not correctly
handle B-Format input buffers. A standalone up-sampler will be needed, similar
to the high-quality decoder.
Also, output is ACN ordering with SN3D normalization. A config option will
eventually be provided to change this if desired.
This will also allow backends to better synchronize the tracked clock time with
the device output latency, without necessarily needing to lock if the backend
API can allow for it.
This prevents a deprecation notice from being output to stdout when alcOpenDevice is called in Mac OS X 10.11.
The new API calls require Mac OS X 10.6 or newer.
The method takes a marked-up filename (e.g. may include %r for a sample rate,
%% for %, etc), and returns a vector of strings of found filenames that match.
It will search the CWD, the local, and global data directories, in that order.
Unfortunately mmdevapi does not do channel remixing or resampling, even for
capture, so the device can only be opened in the mode it's configured for.
For now, fallback to dsound or winmm to get the conversion until we can do it
ourselves.
