[openal] Releasing openal-soft with linux games

[Mark Sibly]

Thanks for that!

I'm mainly just interested in diagnosing people's audio problems, not
munging up my app or anything dodgy like that. For example, I'm not yet
even sure whether *my* app is using openal-soft or not on my new ubuntu
setup, since openal 'just works'.



On Thu, Jun 19, 2014 at 10:32 AM, Chris Robinson <chris.kcat at gmail.com>
wrote:

> On 06/15/2014 08:44 PM, Mark Sibly wrote:
>
>> Another quicky: How can I tell whether the system openal is in fact
>> openal-soft? And if so, which version?
>>
>
> Generally speaking, you should check for the capabilities that you
> actually want (extensions, function behaviors, etc), rather than the
> specific implementation/version. It's entirely possible for another
> implementation to come around, now or in the future, that does everything
> you need, and there's no real reason to restrict it. Of course, having a
> default version (which you built/tested with, and ship with) is entirely
> reasonable.
>
> But if you really want to check, the AL_VERSION string will tell you. For
> OpenAL Soft, it's in the format:
>
> <core_major>.<core_minor> ALSOFT <lib_major>.<lib_minor>[.<lib_rev>]
>
> So to parse that using sscanf, you can do:
>
> int alsoftver[2];
> const ALchar *verstring = alGetString(AL_VERSION);
> int ret = sscanf(verstring, "%*d.%*d ALSOFT %d.%d", &alsoftver[0],
>                  &alsoftver[1]);
> if(ret == 2)
>     printf("Detected OpenAL Soft, library version %d.%d",
>             alsoftver[0], alsoftver[1]);
>
> The lib may have a third version point, but not all versions report it. If
> you want it, you could do:
>
> int alsoftver[3];
> const ALchar *verstring = alGetString(AL_VERSION);
> int ret = sscanf(verstring, "%*d.%*d ALSOFT %d.%d.%d", &alsoftver[0],
>                  &alsoftver[1], &alsoftver[2]);
> if(ret >= 2)
> {
>     if(ret == 2)
>         alsoftver[2] = 0;
>     printf("Detected OpenAL Soft, library version %d.%d.%d",
>             alsoftver[0], alsoftver[1], alsoftver[2]);
> }
>
>
> Note that you can only safely call alGetString after a context has been
> made current, and it applies only to the device that context belongs to.
>
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