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Bug 3858

Summary: Sound issues with SDL 2.0.6
Product: SDL Reporter: Simon Howard <fraggle+libsdl>
Component: audioAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: blocker    
Priority: P2 CC: devnexen, ewasylishen, jajdorkster, janisozaur+libsdl, sezeroz
Version: 2.0.6   
Hardware: x86   
OS: Other   

Description Simon Howard 2017-10-02 21:12:16 UTC 
Please see these bug reports for details:

https://github.com/chocolate-doom/chocolate-doom/issues/945
https://github.com/bradharding/doomretro/issues/410

I'm seeing conflicting reports that SDL either crashes or plays no sound with that SDL 2.0.6 (2.0.5 does not have this problem).

Using a larger audio buffer appears to resolve the problem, but it would be good if it was fixed on the SDL side. Apparently a new SDL_mixer release might also fix the problem?
Comment 1 Sam Lantinga 2017-10-02 22:41:36 UTC 
Ryan, can you look at this ASAP?
Comment 2 Ozkan Sezer 2017-10-03 05:40:00 UTC 
Can this be related to bug #3848 or bug #3849? (Haven't looked at your code.)
Comment 3 David Carlier 2017-10-03 06:50:00 UTC 
Hi here the person who posted the error on GitHub.
It seems very likely it is, got a segmentation fault for similar reason, the 3849 leads me to think I was not extremely far from the truth.
Comment 4 David Carlier 2017-10-03 07:00:25 UTC 
On Arch Linux, unlike Debian based distros, there is no separated packages with debug symbols but I started to have a look at the code and it seems there is quite a change between 2.0.5 and 2.0.6 ... could this be, somewhat, related to it ?

http://hg.libsdl.org/SDL/file/8df7a59b5528/src/audio/SDL_audiocvt.c#l807
Comment 5 janisozaur 2017-10-04 09:28:49 UTC 
bug #3848 and bug #3849 do cover both issues spotted in 2.0.6 release. I think this report can be considered a duplicate of those two.
Comment 6 Justin Jacobs 2017-10-11 03:02:46 UTC 
I think I've also encountered this bug. I've posted a trace here: https://github.com/clintbellanger/flare-engine/issues/1516#issuecomment-335667432

It appears that this bug happens when resampling sounds from high -> low frequencies. In our case, we're going from 44100Hz to 22050Hz. Using a higher frequency for Mix_OpenAudio() results in no crash.
Comment 7 Sam Lantinga 2017-10-12 15:43:05 UTC 
Can you check to see if this is fixed in the latest snapshot?
http://www.libsdl.org/tmp/SDL-2.0.zip

Thanks!
Comment 8 Justin Jacobs 2017-10-12 16:12:58 UTC 
The issue I was having appears to have been fixed in that snapshot. Nice work!
Comment 9 Ryan C. Gordon 2017-10-12 16:18:01 UTC 
I think this is fixed along with the other mentioned reports, so I'm resolving this bug.

--ryan.
Comment 10 Simon Howard 2017-10-27 17:19:11 UTC 
Multiple reports from Chocolate Doom users are that this is still not fixed.

<https://github.com/chocolate-doom/chocolate-doom/issues/945>
Comment 11 Eric Wasylishen 2017-10-30 02:44:50 UTC 
It looks like a bug in Chocolate Doom (buffer passed to SDL_ConvertAudio is smaller than the required len*len_mult), see my comment on https://github.com/chocolate-doom/chocolate-doom/issues/945
Comment 12 David Carlier 2017-10-31 09:59:34 UTC 
The question is, since the change from SDL_memcpy to SDL_memmove did not fully fix it (I think personally it s a good change to keep), and if the code consumers really need to allocate more memory than with versions <= 2.0.6, assuming it is intended and not a edgy bug, would it be relevant to mention it in changelogs, relevant C header file ... ? because not obvious unless you read the source code to realise it has been rewritten :-)
Comment 13 Simon Howard 2017-11-01 04:43:52 UTC 
#11 is correct. It looks like this was indeed a bug in Chocolate Doom, albeit one that appears to only have been exposed due to the recent audio changes.

A fix has now been merged in Chocolate Doom.