FW: [Openal] Release build problems

[Peter Mares]

Ok, I've managed to reproduce the error in a stripped down piece of
code:

Here is pseudo code for the problem:

Main function()
{
	Initialise OpenAL;
	Create OpenAL Context;
	Make the context current;
	Create 2 buffers;
	Create 2 sources;
	Load a WAV file into each buffer;
	Assign each buffer to a source;
	Create Thread 1;
	Create Thread 2;
	Wait for Threads to exit;
	ShutDown OpenAL;
}

Thread1 Function()
{
	Wait for key input;
	If '1' was pressed
		Play Source #1;
	else if '2' was pressed
		Play Source #2;
}

Thread2 Function()
{
	Wait for key input;
	If '3' was pressed
		Play Source #1;
	else if '4' was pressed
		Play Source #2;
}

What you observe is that as soon as source #1 is played from within the
context of a particular thread, lets say thread 1, any attempts at
playing source #1 on the alternative thread produce no sound (as well as
no error).

I suppose I would have to ensure that all sounds get played within the
context of the same thread? But surely this is something OpenAL should
support?

Any comments will be appreciated.
Peter


-----Original Message-----
From: openal-admin at opensource.creative.com
[mailto:openal-admin at opensource.creative.com] On Behalf Of
dpeacock at creativelabs.com
Sent: Wednesday, July 06, 2005 6:19 PM
To: OpenAL Mailing List
Subject: Re: [Openal] Release build problems






Hi Peter,

What version(s) of the AL DLLs are you using (OpenAL32.dll, wrap_oal.dll
and ct_oal.dll (if present)) ?   What AL device are you opening ?

Dan

Daniel Peacock
Custom Engineering Dept.
Creative Labs, Inc.
email : dpeacock at creativelabs.com
phone : (408) 546 6552

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             "Peter Mares"

             <pmares at controlsh

             ift.co.za>
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Subject 
                                       [Openal] Release build problems

             07/05/2005 01:10

             PM

 

 

 

 





Hi there,

A while ago I posted that I was getting strange behaviour in my release
build with regards to sound playback. Someone suggested that I might
have memory (de)allocation problems, so I checked that out and fixed all
the memory leaks (I had no assertions or overwrites). I still have the
problem.

Allow me to paint a quick picture as to what my code is doing, and then
maybe you can help:

1. I initialise OpenAL in the main thread of the application. 2. The
main thread launches a window which acts as my "control panel" for the
application. Any sounds played from within this window work fine. 3.
When the main thread launches a plugin, a worker thread is created in
which the plugin window is created. 4. Within the plugin, I am
experiencing this problem: A sound will play once, but as soon as it is
finished playing, it will not play again, until I kill and restart the
thread.

This leads me to believe that I am not doing something on a per-thread
basis (perhaps some form of initialisation). Has anyone got any ideas as
to the problem? To summarise, sounds play great while in the main
thread. As soon as I shift to a worker thread context and attempt to
play sounds, each individual sound will only play once (unless I create
a new source and new buffer each time I wish to play a sound, which I
don't really want to do).

Thanks in advance,
Peter
ForwardSourceID:NT0002377E

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