[openal] OpenALSoft on Android, how to handle suspend/resume of application

[Olle Hedman]

I think I got the recording working!
I havn't tried listening to the audio, but it seems to work fine to open
the recording device and I do get changing data from my alcCaptureSamples
call.

All I did in OpenALSoft was change desc.componentSubType to
kAudioUnitSubType_RemoteIO, and removed all calls related to AudioDeviceID.

I also had to add the NSMicrophoneUsageDescription key to my Info.plist for
the permission dialog to work.


On 5 September 2018 at 13:22, Olle Hedman <olle at illusionlabs.se> wrote:

> > Was the capture issue a problem with compiling, or a problem running
> the app even if it doesn't attempt to create a capture device?
>
> I looked a bit closer at it, as is, the ALCcoreAudioCapture_open code does
> not compile, the problem is AudioObjectGetPropertyData and AudioDeviceID is
> not available on iOS, and we need to use kAudioUnitSubType_RemoteIO instead
> of kAudioUnitSubType_HALOutput
> Shouldn't be too hard to fix I think. I could see if I can get it to
> work...
>
> I don't think there would be any permission issue as long as you do not
> attempt to capture. If I read the documentation right, the system will
> automatically display a permission dialog when the recording audio unit is
> created, or the user of OpenALSoft can first call [AVAudioSession
> requestRecordPermission:]
>
> > For this, there may be another option.
>
> Loopback is interesting, you're probably right I could've used this
> instead. I have no good explanation why I didn't :)
>
>
> On 5 September 2018 at 05:34, Chris Robinson <chris.kcat at gmail.com> wrote:
>
>> On 09/03/2018 06:24 AM, Olle Hedman wrote:
>>
>>> coreaudio-ios-buildfix.diff
>>> -
>>> This small patch is to make coreaudio backend build and run on iOS.
>>> Capture
>>> is disabled. (I have no use for it, and there was some issue with it, I
>>> don't remember exactly. Possibly it's not available on iOS, or there was
>>> some sandbox/entitlement issue)
>>>
>>
>> Was the capture issue a problem with compiling, or a problem running the
>> app even if it doesn't attempt to create a capture device?
>>
>> ios-bundle-config.diff
>>> -
>>> Another minor iOS fix, this makes it possible to keep the config file in
>>> the application bundle.
>>> This might not be needed, but it was how I solved it at that time.
>>> Possibly
>>> you could also just "chdir()" in your app to the bundle path and it would
>>> also work.
>>> I'm not using a config file now, but I thought I should include this
>>> patch
>>> anyhow.
>>>
>>
>> This looks like it may be worth adding regardless.
>>
>> wave-output.diff
>>>
>>
>> For this, there may be another option. By the looks of it, you want to
>> write out the mix to a wav file as the corresponding video frames are
>> processed, in non-real-time (then compress and mux the audio with the video
>> afterward). What you can do instead is use OpenAL Soft's ALC_SOFT_loopback
>> extension to mix the audio in non-real-time, and you then write it to a wav
>> file however you can (or encode it directly).
>>
>> <http://kcat.strangesoft.net/openal-extensions/SOFT_loopback.txt>
>>
>> The alloopback example shows the extension in action, using SDL to play
>> the resulting mix (though you can of course do whatever else you want
>> instead with the rendered mix, as fast or as slow as you want).
>>
>
>
>
> --
>
> *Best regards,*
> *Olof Hedman*
>
> Mobile:
>
> +46 (0)708 - 42 28 76
> Office:
>
> +46 (0)40 - 644 44 95
> Web:
>
> www.illusionlabs.com
> Twitter:
>
> twitter.com/illusionlabs
>
> Illusion Labs AB
> Kalendegatan 25
> SE-211 35 Malmö, Sweden
>
>
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>


-- 

*Best regards,*
*Olof Hedman*

Mobile:

+46 (0)708 - 42 28 76
Office:

+46 (0)40 - 644 44 95
Web:

www.illusionlabs.com
Twitter:

twitter.com/illusionlabs

Illusion Labs AB
Kalendegatan 25
SE-211 35 Malmö, Sweden


"The information in this e-mail, and attachment(s) thereto, is strictly
confidential and may be legally privileged. It is intended solely for the
named recipient(s), and access to this e-mail, or any attachment(s)
thereto, by anyone else is unauthorized. If you are not the intended
recipient please inform the sender by replying to this transmission, and
delete the e-mail, its attachment(s), and any copies of it, without
disclosing it."
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