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Bug 3555

Summary: Got AudioQueueObject Error with SDL 2.05 but not with SDL 2.04
Product: SDL Reporter: Soberka <richard>
Component: audioAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: blocker    
Priority: P2    
Version: 2.0.5   
Hardware: x86   
OS: Mac OS X 10.6   

Description Soberka 2017-01-11 13:52:35 UTC 
Dear All,

Currently I'm porting one of my old games to MacOS.. after few months of work Everything is running fine, almost finished..

I've made all that job on SDL 2.04 + SDL_Mixer 2.01 .. and everything was fine.

Recently I've updated to SLD 2.05 (still with the latest SDL_Mixer witch remains the 2.01)

The games runs fine, audio too, but when quitting I've got the following error on the console : AudioQueueObject::FreeBuffer: AQBuffer * 0x10150b270 has enqueue count of 1

I've tried everything for hours, and nothing helps, I even tried to simplifies my code by removing everything  with just the "Mix_OpenAudio" at beginning and "Mix_CloseAudio" at the end.. nothing helps

the only cure is to go back to SDL 2.04 instead SL 2.05

Any ideas ?

NB : MacPro Mac OS 10.68 Xcode 3.25 64 bits GCC 4.2

Many thanks
Comment 1 Ryan C. Gordon 2017-01-24 17:29:05 UTC 
> the only cure is to go back to SDL 2.04 instead SL 2.05

Is there a build of the game you can send me that reproduces this problem?

--ryan.
Comment 2 Soberka 2017-02-12 18:09:01 UTC 
Hello,

I've find an empirical way to solve the problem !!!

...I've reduced the Chunk Size !

When initializing the Mixer, under SDL 2.04, or 2.03 , I've always setting the chunks Size to 1024, like that :

Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, MIX_DEFAULT_CHANNELS, 1024)

I still, can't figure why with SDl 2.05, when quitting,  I am gettingthe following message : "AudioQueueObject::FreeBuffer: AQBuffer * 0x10150b270 has enqueue count of 1"

But, i've just discovered that, if i reduce chunk size to 512 , like : 

Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, MIX_DEFAULT_CHANNELS, 512)

...No more error with SDL 2.05 when quitting ! ?

Crazy , isn't it ?

(maybe due to some shorter OSX internal delay when AudioQueueFreeBuffer is called ?) 

If you have an better idea to avoid the error message , with larger buffer, I'm still interested ;-)

Best reagards

Richard
Comment 3 Ryan C. Gordon 2017-05-24 04:47:58 UTC 
We wait for the CoreAudio-specific audio thread to shut down, but we don't actually have an SDL_Delay() to wait until playback is definitely complete before freeing the buffers, like we do for the standard SDL audio thread. I bet that's the problem.

--ryan.
Comment 4 Ryan C. Gordon 2017-05-24 05:30:56 UTC 
(In reply to Ryan C. Gordon from comment #3)
> We wait for the CoreAudio-specific audio thread to shut down, but we don't
> actually have an SDL_Delay() to wait until playback is definitely complete
> before freeing the buffers, like we do for the standard SDL audio thread. I
> bet that's the problem.

Actually, we _do_ try to delay before the thread ends, and we wait on that thread, but I wonder if we should forcibly dequeue any buffers right before freeing, since our callback re-adds them, and and we use the runloop to wait which might call our callback, and maybe that causes a race...?

--ryan.
Comment 5 Ryan C. Gordon 2017-05-24 17:33:31 UTC 

This should be fixed in https://hg.libsdl.org/SDL/rev/24b2d63e8310 along with a few other corner cases...the CoreAudio manual says we shouldn't free the buffers ourselves, but let AudioQueueDispose() deal with it, so we do that now; I assume this will stop the warning message.

--ryan.