[Openal] sounds openAL can play
toby z
dyavolo_blu at yahoo.co.uk
Thu Jun 16 06:52:41 PDT 2005
thans for the reply Dan,
I need to play a different file (0-87) for piano
notes, when u click on a note, or move mouse over, it
should play, but they need to be played in succession,
there cant be any gaps between them playing, so i
thought i could
a. fill in 88 buffers, one for every note file,
b. link buffer to sources
c. play source
d. unlink
loop b,c,d
but i dont want to give it wave-file-names to laod
them one by one, i was thinking about keeping them all
in a directory and reading them in one after another
and since I'm going to move my mouse over the notes to
play, so if i go from playing note0 to note22, play
all notes between them and then back to note13 from
note22, play all the notes, all the way
and so far, looping is the only thing I have thought
of
plseae tell me if its still not clear and I'll try to
repharase it
thanks a mill,
Toby
--- dpeacock at creativelabs.com wrote:
>
>
>
>
> Hi Toby,
>
> Could you give us some more information about what
> you are trying to
> achieve ? I think this will help us to give you
> better answers to your
> questions. Specifically are your 88 wavefiles
> different sound-effects that
> need to played based on certain events, or are they
> chunks of audio that
> need to be played back one after another ? Why are
> you concerned about
> loading 88 samples, and why do you think you need to
> loop them ?
>
> Just to clarify a point from your previous mail -
> once a wavefile has been
> loaded into an AL Buffer it will stay there until
> you choose to delete the
> buffer. While the buffer exists it can be attached
> to as many Sources as
> you like and played.
>
> Thanks,
>
> Dan
>
> Notice
> The information in this message is confidential and
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> privileged. It is intended solely for the
> addressee. Access to this
> message by anyone else is unauthorized. If you are
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>
>
>
>
>
> toby z
>
> <dyavolo_blu at yaho
>
> o.co.uk>
> To
> Sent by: Jason Daly
> <jdaly at ist.ucf.edu>
> openal-admin at open
> cc
> source.creative.c openAl
>
> om
> <openal at opensource.creative.com>
>
> Subject
> Re: [Openal]
> sounds openAL can play
> 06/15/2005 05:07
>
> PM
>
>
>
>
>
>
>
>
>
>
>
>
>
> Hi again Jason,
>
> I'm afraid I am asking this again,
>
> my sources are limited, but I can have as muny
> buffers
> as I want, so to play 88 wav files, I could load
> them
> into 88 buffers and keep 4 sources in the
> application,
>
>
> que the buffer on the sources and play the file
> associated to it when it finds a free source to bind
> the file to ?
>
> or am I still far from sanity ?
>
> I tried to do something yesterday about the sources
> my
> system supports and it didnt work very well, so I'm
> out flapping again
>
> I cant really load 88 different files into an
> application without looping them, besides I dont
> want
> to give the alLoadWAFfile names of those files, I am
> thinking about letting it get the files from a
> directory (a pool of wave files even), load them and
> then bind them with the 4 sources I generate
>
> ok now I think I'm loosing it, or am I ?
>
> I am going to write a little program today to try
> this
> out, but please do tell me what you think of it
>
> Thanks a lot,
>
> Toby
>
>
>
> --- Jason Daly <jdaly at ist.ucf.edu> wrote:
>
> > toby z wrote:
> >
> > >hi guys,
> > >
> > >im looking up the archives but i cant really find
> > this
> > >bit which im sure must have already been answered
> a
> > >million times or something,
> > >
> > >q1. how many sounds can OpenAL play at a time ?
> > >
> > >i know OpenAL supports 32 buffers, which play
> > sources
> > >loaded into them, if i am recalling it right,
> that
> > >would mean it can play 32 sounds at a time, from
> 32
> > >different sources
> > >
> > >
> > Close, but you've got it backwards. You can have
> as
> > many buffers as you
> > want (only limited by system memory), but sources
> > are the limited
> > resource. Data is loaded into buffers, and
> buffers
> > are assigned (or
> > queued) on sources. The number of sources you can
> > have allocated at one
> > time depends on which implementation you're using,
> > and possibly what
> > sound hardware you have. With an SB Live!, using
> > the native Creative
> > driver, you'll typically have 30 or so sources
> > available, while with an
> > Audigy, you may have 62. If you're using the
> > DirectSound or MMSYSTEM
> > implementation, I think these are limited to 32
> > sources, just to keep
> > CPU usage down.
> >
> > With most back-ends of the current Linux
> > implementation, you can
> > generate as many sources as your system can
> handle.
> >
> > >q2. so if i have 88 different sounds that i wanna
> > >play, i will need to que them up to take buffer
> > which
> > >get freed or realeased after a source is done
> with
> > it,
> > >but what if i need to play sound 22 again, after
> > its
> > >buffer was freed and in use by another sound,
> mmmm,
> > 79
> > >?
> > >
> > >
> > >
> > Most audio engines that use OpenAL have some kind
> of
> > source allocation
> > scheme, so that the most "important" sounds get
> > played when they need to
> > be, while the less important sounds are pre-empted
> > to make sure there
> > are enough sources available. In my case, I use
> the
> > effective gain of
> > the sound (accounting for how loud the sound is
> > originally, and how
> > quiet it gets based on distance), along with an
> > application-assigned
> > priority. This is pretty easy to implement, and
> it
> > ends up sounding
> > pretty good in most cases.
> >
> > Other schemes can get a lot more complex. For
> > example, if you really
> > need to play 88 sounds at the same time, you can
> > look into clustering
> > (exercise left for the reader :-) ).
> >
> > --
> >
> > --"J"
> >
> > "I'm a castaway stranded in a desolate land,
> > I can see the footprints in the virtual sand."
> > --Neil Peart
> >
> >
>
>
>
>
>
>
>
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