[openal] Open specific output device on Mac OS X

[Cyril Drouet]

Thanks James for the response, that was my guess.

On Wed, Apr 4, 2018, 3:28 AM James Turner <zakalawe at mac.com> wrote:

>
>
> 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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