[openal] Open specific output device on Mac OS X

[James Turner]

> On 3 Apr 2018, at 23:42, Cyril Drouet <cyril.drouet at gmail.com> wrote:
> 
> I have used OpenAL Soft on Windows and Linux for a few years already but this is the first time I'm using it on Mac OS X. I'm trying to open a specific output device but things seem to work a bit differently on this platform. When I list the devices, I only get "CoreAudio Default". It seems that it will always use the default device the user selected in his preferences and switch device automatically if the user selects a different device (or if the device is disconnected). 
> 
> Is there a way for OpenAL to use a specific device? I can list the available audio devices using the CoreAudio API, but I don't see a way to use that with OpenAL.
> 
> If there isn't a way with OpenAL, does anyone have a solution to do that through CoreAudio? I'm not very familiar with CoreAudio but it seems that I would need to get the AudioUnit used by OpenAL in order to change which audio device to use. It that even possible?
>  

This needs some extension to OpenAL code on Mac. I would also really like it for FlightGear, and I know sufficient CoreAudio to say, the work is not very difficult, but I didn’t find a spare weekend so far to contribute a patch. But I think it’s only a few hours work, the CoreAudio API is not so complex.

I would really recommend fixing this in the OpenAL code BTW, manipulating audio-units directly gets more complex fast, is my limited experience. (CoreAudio API is application facing, AudioUnits API is meant for people writing new filters and plugins)

Kind regards,
James

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