#119
  • Created on
    2009-09-12 09:16
  • Reported by
    Anonymous
  • Status
    Invalid
  • Priority
    Normal (3)
  • Assigned to
    thijz
  • Milestone
    0.9.6
  • Plan Level
    -
  • Due Date
    -

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OSS driver won't start due to wrong block size

When I try to start the OSS driver I get a pop-up with the message "Error starting audio driver". At the console I get:

[ERROR] OssDriver ERROR_IOCTL: unable to set BlockSize
[ERROR] Hydrogen [audioEngine_startAudioDrivers] Error starting audio driver [audioDriver::connect()]
[ERROR] Hydrogen [audioEngine_startAudioDrivers] Using the NULL output audio driver
[ERROR] Hydrogen [audioEngine_startAudioDrivers] m_pMainBuffer_L == NULL
[ERROR] Hydrogen [audioEngine_startAudioDrivers] m_pMainBuffer_R == NULL
[ERROR] Hydrogen [audioEngine_setupLadspaFX] nBufferSize=0
[ERROR] NullDriver [setBpm] not implemented yet

I found a report of an identical situation at http://72.32.12.210/archives/openbsd/2007-04/2109.html, where a patch with a simple workaround is also provided. I haven't tried this fix yet, although I assume it will work. However the ideal situation would be for Hydrogen to have the ability to choose its own block size for low-latency running under OSS, rather than letting OSS impose its default.

I am using Hydrogen 0.93 and OSS4 on Linux.
User picture
  on 2009-09-24 15:10 *
By Anonymous
please fix this! I got it at 0.9.4 too.
User picture
  on 2009-09-24 16:27 *
By Anonymous
I tried the patch, with 0.9.4, it works!
User picture
  on 2009-10-26 17:35 *
By mauser
Milestone changed from 0.9.4 to 0.9.5
Updating tickets (#75, #93, #106, #107, #110, #114, #115, #116, #118, #119)
User picture
  on 2011-07-04 10:10 *
By thijz
Assigned to set to thijz
Milestone changed from 0.9.5 to 0.9.6
moved to 0.9.6
need to check if ticket can be closed (since there seems to be a patch)
User picture
  on 2011-11-08 16:55 *
By wolke
Status changed from New to Accepted
problem. we need testers with oss driver which can test the patch. i compile my kernels all time without oss support. so i can not verify this patch.
User picture
  on 2011-11-09 02:44 *
By thijz
i have OSS available.
will test today
User picture
  on 2011-11-10 07:09 *
By thijz
tested on 0.9.5 :
this seems to happen in a number of cases, mainly when you switch between audio drivers (something that you typically dont do very often)
i also saw it happen while i was playing around with ALSA settings, so i'm not sure if this is an OSS-only issue

in some cases i even got H2 to segfault (persistently) after changing buffer settings and switching to an other audio driver. I had to manually change my hydrogen.conf to fix this (changing 'ASLA' to 'OSS')

it looks as if there is no mechanism to check if the buffer settings are valid for a specific audio driver.
it also looks like there is no mechanism that ensures a smooth switch-over from audio river A to audio driver B

i will repeat my test on the 0.9.6 but on the 0.9.5 it seems quite easy to get H2 to crash if you mess with these settings
to be continued
User picture
  on 2011-11-10 14:37 *
By wolke
hi thijs,
i will check in the oss patch from the ticket creator. if you have some time and you like, please check if this ticket bug is fixed. because this bug and the patch are oss specific.

we/you can create a new ticket about problems you describe in your last comment.
greetings wolke
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  on 2011-11-10 15:14 *
By thijz
ok, i'll split this up in separate tickets (but i'll first try to find a good way to reproduce each of these bugs)
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  on 2012-11-29 08:07 *
By thijz
Status changed from Accepted to Invalid