[Openal] porting questions

[Luis]

Hi Dave.
>From what I've seen, you will get some AL_INVALID_OPERATION error when
trying to attach buffers when no more hardware voices are available,
be it mono or stereo or whatever, this thing kept me quite puzzled for
kind of a while :). I fixed it by keeping track of the number of
channels , as there's no direct mapping from source objects to voices.
Hope that helps

On 6/7/07, Dave Shillito <dave.shillito at kuju.com> wrote:
> > Dan Peacock Wrote:
> >
> > So, if you generate 60 Sources then you will know that you can play
> back
> > 60
> > 3D mono buffers simultaneously.  NOTE : If you are playing buffers
> with
> > more than 1 channel then they require additional resources (e.g stereo
> > takes 2 voices on hardware, 5.1 takes 6 voices, etc ...).  You can
> either
> > keep track of this yourself (e.g with 60 Sources if you play one
> stereo
> > then you can only play 58 mono buffers), or you can use the alc
> Context
> > creation hint ALC_STEREO_SOURCES to tell OpenAL to reserve Sources to
> > enable playback of a certain number of stereo buffers simultaneously.
>
> Hi Dan,
>
> That is an interesting titbit I did not pickup from the docs.
>
> I am currently creating as many sources as are possible at startup, and
> then assigning these buffers as the app progresses.
>
> So presumably from what you have just said, if I was only able to
> generate  30 sources at startup (using alGenSources) and I then assigned
> one of these a stereo buffer (using alSourceQueueBuffers), I would only
> be able to use 28 if the remaining sources.
>
> So what happens to the remaining (already generated) source?
> (I generated 30, 1 is playing a stereo buffer, 28 are playing mono
> buffers so 1 remains)
>
> Does this source just fail to accept buffers?
> Does it accept buffers but fail to play them?
> Is there some way to determine that this source is 'no longer working'
> before I try to use it?
>
> Alternatively if I'm playing mono sounds on all 30 sources, stop one and
> remove its buffers, then try to queue a new stereo buffer on that
> source, what will the result be?
>
> There are other questions this raises but that will do for now.
>
> DAve
>
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-- 
Luis