[Openal-devel] Problem playing different sound using same source id

[MaciejS]

Hi Daniel,

Thanks for your suggestions.

I'm sorry for delayed reply.

(Un)fortunately described problem has suddenly disappeared after restarting
PC and I couldn't reproduce it since then with exactly same code. Before
restarting I spent few hours trying to create that simple case. And I did
check all openal errors, there was none.

So, now it's probably not worth investigating anymore.

But anyway my details were:
OS: Windows XP
sound card: Realtek High Definition Audio (as part of Asus notebook)
driver: OpenAL ver. 1.1
  Renderer: Software
  Vendor: Creative Labs Inc.

Thanks,
Maciej


Daniel PEACOCK wrote:
> 
> 
> 
> 
> 
> Hi,
> 
> Which OpenAL device are you opening?   Which OS are you using, and which
> soundcard?
> 
> I would recommend changing the way you are checking to see if a Source has
> finished playing from ...
> 
> if (state == AL_STOPPED)
>       ...
> 
> to
> 
> if (state != AL_PLAYING)
>       ...
> 
> (and if you support Pause / Resume) then it should be
> 
> if ((state != AL_PLAYING) && (state != AL_PAUSED))
>       ...
> 
> This is because some implementations set the state to AL_INITIAL when it
> is
> not playing anymore.
> 
> I would also make sure that there were no errors set during any of these
> calls, and critically when creating and attaching audio data to bufferB.
> 
> Dan
> Creative Labs (UK) Ltd.
> 
> Notice
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> 
> 
> 
>                                                                            
>              MaciejS                                                       
>              <msawitus at gmail.c                                             
>              om>                                                        To 
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>              openal-devel-boun         m                                   
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>              eative.com                                                    
>                                                                    Subject 
>                                        [Openal-devel] Problem playing      
>              02/02/2009 11:38          different sound using same source   
>              PM                        id                                  
>                                                                            
>                                                                            
>                                                                            
>                                                                            
>                                                                            
>                                                                            
> 
> 
> 
> 
> 
> Hi,
> 
> I've just hit weird problem with OpenAL when trying to play sound using
> source which was previously used for playing different sound.
> 
> I have installed latest OpenAL and got latest OpenAL SDK (1.1).
> 
> The exact repro scenario is as follows:
> (1) initialize openal, allocate as many as possible source ids
> (2) grab first source id and play the sound A, wait till it finishes
> (3) use the same source id and play sound B <<== the sound doesn't play
> even
> though openal sais it being plays
> 
> I can repeat (3) as many times as I want and the sound will never actually
> be heard. If I use another source id from allocated pool, then it plays.
> Sound A can be played again as many times as I want using first source id
> though.
> 
> However if I play any sound while sound B is still supposed to play (and
> so,
> I need to use another source id), the sound B gets _unlocked_ and it can
> suddenly be heard from where it was supposed to be at that time. From now
> on
> I can play B as many times as I want.
> 
> I have double checked I don't change _any_ source attributes like pitch /
> gain or other.
> This is the complete OpenAL calls that lead to problem:
> 
> source0 is my source id
> bufferA and bufferB are two OpenAL sound buffers
> 
> // Play sound A
> alSourcei(source0, AL_BUFFER, bufferA);
> alSourcePlay(source0);
> while (true)
> {
>   ALint state;
>   alGetSourcei(source0, AL_SOURCE_STATE, &state);
>   if (state == AL_STOPPED)
>     break;
> }
> alSourceStop(source0);
> alSourcei(source0, AL_BUFFER, 0);
> 
> // Play sound B - won't play !!!!
> alSourcei(source0, AL_BUFFER, bufferB);
> alSourcePlay(source0);
> while (true)
> {
>   ALint state;
>   alGetSourcei(source0, AL_SOURCE_STATE, &state);
>   if (state == AL_STOPPED)
>     break;
> }
> alSourceStop(source0);
> alSourcei(source0, AL_BUFFER, 0);
> 
> Thanks anyone for any help with that!
> 
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