[openal] HRTF on Android

[Cyril]

I didn't know about ALSOFT_LOCAL_PATH. This should help, otherwise I'll try the latest from the Git repo tomorrow. 

Thanks for the quick response!

> On Feb 16, 2017, at 9:28 PM, Chris Robinson <chris.kcat at gmail.com> wrote:
> 
>> On 02/16/2017 06:34 PM, Cyril Drouet wrote:
>> From what I understand, on Windows or Linux, I'm supposed to edit the
>> alsoft.conf file and set hrtf to true, and specify a list of files to
>> hrtf_tables.
> 
> The hrtf and hrtf_tables config options are for setting it on your specific system. With 1.17.2, you can set the ALSOFT_LOCAL_PATH environment variable before calling any OpenAL functions (really before HRTFs are enumerated, but that can happen implicitly by a number of calls so it's best to set it once ASAP). It will then search that path for mhr (HRTF) files when enumerating them. I don't know exactly how this works for "normal" Android apps, where files should be so standard I/O functions can access them. With the current Git version (soon 1.18), you can embed a couple HRTFs into the lib so they're automatically accessible.
> 
> The hrtf option is just to set the default behavior for using HRTF. The ALC_SOFT_HRTF extension is how you can enable/disable it from the app. Though obviously it won't help much if the lib didn't find any HRTF files to use.
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