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kcat / openal-soft

OpenAL Soft is a software implementation of the OpenAL 3D audio API.
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ALC_OUT_OF_MEMORY if i open my default device. #277

Open EricDiCiv5 opened 5 years ago

EricDiCiv5 commented 5 years ago

Recently I've been working on two programs which use the OpenAL API in the language of python in order to guide the user (one as a compass and the other as a gps).

Initially they execute it but suddenly at one point the program at the execution was not able to allocate some memory for the default device that openal is using, indicated in the traceback just like that:

Traceback (most recent call last):
  File "footsteps_7.py", line 190, in <module>
    main()
  File "footsteps_7.py", line 55, in main
    device = alcOpenDevice( None )
  File "/usr/local/lib/python3.5/dist-packages/openal/alc.py", line 57, in alc_check_error
    raise ALCError(alc_enums[err][0])
openal.alc.ALCError: ALC_OUT_OF_MEMORY

Is there any way to free the memory of the openal buffers in order to allow the assignation of the default device into the openal memory?

P.S: Links to the two Python programs (compass first, gps last) https://github.com/gdsa1022/TFG_HRTF/blob/master/footsteps_72.py https://github.com/gdsa1022/TFG_HRTF/blob/master/footsteps_82.py

kcat commented 5 years ago

Which version of OpenAL are you using, and what audio system (ALSA, PulseAudio, OSS, SoundIO)?

OpenAL does free the memory it allocates. On a modern system, ALC_OUT_OF_MEMORY typically means system resource exhaustion rather than running out of physical memory (especially on Linux, which uses lazy allocation). If you're able to run this under a debugger (with debug info for libopenal), you can set the ALSOFT_TRAP_ERROR environment variable to true or 1, which will cause the debugger to break with a SIGTRAP. You can then get a backtrace to see where that error is being set, which will help me narrow down the issue.

EricDiCiv5 commented 5 years ago

I'm using 1.19.1 OpenAL version with PulseAudio as the device.

qwertychouskie commented 5 years ago

SuperTuxKart would sometimes have this error, the issue ended up being that too many sources were being allocated, because of a source not being freed. If you need more sources than the default 256, see https://github.com/kcat/openal-soft/issues/144#issuecomment-326712057.

EricDiCiv5 commented 5 years ago

By using 'pdb', the backtrace obtained is the next one:

`pi@raspberrypi:~/geopy/neo-6M $ sudo python3 -m pdb -c continue footsteps_8.py AL lib: (WW) GetSymbol: Failed to load jack_error_callback: /usr/lib/arm-linux-gnueabihf/libjack.so.0: undefined symbol: jack_error_callback AL lib: (WW) jack_msg_handler: Cannot connect to server socket err = No such file or directory AL lib: (WW) jack_msg_handler: Cannot connect to server request channel AL lib: (WW) jack_msg_handler: jack server is not running or cannot be started AL lib: (WW) jack_msg_handler: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock AL lib: (WW) jack_msg_handler: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock AL lib: (WW) init: jack_client_open() failed, 0x11 AL lib: (WW) alc_initconfig: Failed to initialize backend "jack" AL lib: (WW) alc_initconfig: Failed to initialize backend "pulse" ALSA lib confmisc.c:767:(parse_card) cannot find card '0' ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default AL lib: (EE) AlsaPlayback::open: Could not open playback device 'default': No such file or directory AL lib: (WW) alcSetError: Error generated on device (nil), code 0xa005 Traceback (most recent call last): File "/usr/lib/python3.5/pdb.py", line 1665, in main pdb._runscript(mainpyfile) File "/usr/lib/python3.5/pdb.py", line 1546, in _runscript self.run(statement) File "/usr/lib/python3.5/bdb.py", line 431, in run exec(cmd, globals, locals) File "", line 1, in File "/home/pi/geopy/neo-6M/footsteps_8.py", line 9, in ''' File "/home/pi/geopy/neo-6M/footsteps_8.py", line 53, in main device = alcOpenDevice( None ) File "/usr/local/lib/python3.5/dist-packages/openal/alc.py", line 57, in alc_check_error raise ALCError(alc_enums[err][0]) openal.alc.ALCError: ALC_OUT_OF_MEMORY Uncaught exception. Entering post mortem debugging Running 'cont' or 'step' will restart the program

/usr/local/lib/python3.5/dist-packages/openal/alc.py(57)alc_check_error() -> raise ALCError(alc_enums[err][0]) `

kcat commented 5 years ago

AL lib: (EE) AlsaPlayback::open: Could not open playback device 'default': No such file or directory

This would be the reason. The PulseAudio backend fails to initialize (missing client library, or can't connect to the server), so it uses ALSA instead. The ALSA backend then fails to open the default device (and it seems ALSA is unable to parse its configuration). The OpenAL standard is pretty poor when it comes to what to report for an unavailable device -- there is no ALC_DEVICE_UNAVAILABLE or similar -- so it gives ALC_OUT_OF_MEMORY in lieu of a resource being valid but unavailable.

McSinyx commented 4 years ago

I had similar problem, but only when the sound card is doing something else, and the thing is running in a Python virtualenv. I'm not sure how this is going to help solving this issue though.