[openal] Trying to implement a linear 1D (left/right) audio balance
Ethan Lee
flibitijibibo at flibitijibibo.com
Sun Apr 20 21:26:32 EDT 2014
Yup, that's basically all it does.
It's hard to say re: the gain result; if you're not already using OpenAL
Soft you'll want to check with that first. As long as the
listener/source gains seem right and it all aligns with the distance
model, you should be able to make adjustments from there to get it to
where you want.
-Ethan
On 04/20/2014 09:22 PM, Villermen wrote:
> Thanks for the quick replay Ethan!
>
> This does seem like the closest it gets. Do I get it right if I say
> that it sort of creates a half-circle around the z-axis to make the
> distance to the listener stay the same?
>
> The actual gain around -1f and 1f for INTERNAL_pan does seem higher
> than 1. Is there a way to get this closer? If not I'll happily take
> this way of handling it as it's too close to really give anything
> about it.
>
> Gr.Villermen
>
>
> On Mon, Apr 21, 2014 at 2:52 AM, Ethan Lee
> <flibitijibibo at flibitijibibo.com
> <mailto:flibitijibibo at flibitijibibo.com>> wrote:
>
> In FNA we do something like this, but it's probably not ideal (if
> not just incorrect):
>
> https://github.com/flibitijibibo/MonoGame/blob/monogame-sdl2/MonoGame.Framework/Audio/SoundEffectInstance.cs#L58
>
> I know for sure that this doesn't provide hard panning, but you
> probably didn't _really_ want to do hard pans anyway. We do that
> work to keep things at the 1.0f distance, but if attenuation isn't
> required for your project, you can turn that off and possibly save
> some time/effort:
>
> https://github.com/flibitijibibo/MonoGame/blob/monogame-sdl2/MonoGame.Framework/Audio/OpenALDevice.cs#L102
>
> -Ethan
>
>
> On 04/20/2014 08:44 PM, Villermen wrote:
>> Hey there,
>>
>> After not being able to figure this one out myself I've posted my
>> question on the OpenTK forums and StackOverflow, where I was
>> suggested by the OpenTK dev to ask you about it =)
>>
>> Basically I'd like to have a balance value of -1f (left channel
>> only) to 1f (right channel only) be converted into a position for
>> an OpenAL source where it will act as such:
>> When having 0f (default value) as balance value both sides
>> (left/right ear) should be at 100% gain.
>> When 1f 100% for the right ear and 0% for the left ear and the
>> opposite for -1f.
>> They should attenuate in a linear way.
>>
>> For what I've tried so far please read my post on StackOverflow
>> <http://stackoverflow.com/questions/23154049/linear-1d-audio-balance-with-openal>.
>> I'm working with the OpenTK library but I am pretty sure I can
>> convert any OpenAL related answer to it, just as long as I can
>> understand it in general.
>>
>> I would really like to know if and how this is possible, and any
>> thoughts on this are welcome!
>>
>> Gr.Villermen
>>
>>
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>
>
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