[Openal] porting questions

[Dave Shillito]

Thanks Luis & Dan For your suggestions, I think I'll have to track how
many buffers I am using.

DAve

> -----Original Message-----
> From: Luis [mailto:h.k.1981 at gmail.com]
> Sent: 07 June 2007 12:07
> To: Dave Shillito
> Cc: openal at opensource.creative.com
> Subject: Re: [Openal] porting questions
> 
> 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
> 
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