[Bug 27917] [regression] sound does not work, wine chooses wrong pcm

wine-bugs at winehq.org wine-bugs at winehq.org
Wed Jul 27 08:08:28 CDT 2011


--- Comment #1 from Andrew Eikum <aeikum at codeweavers.com> 2011-07-27 08:08:28 CDT ---
Thanks for the very nice report.

I think this is technically a bug in FreeBSD's OSS implementation. According to
the OSS 4.2 spec[1], the oss_audioinfo.caps member for the default device
should contain the PCM_CAP_DEFAULT flag. If you look at your log, you'll see
every "caps:" line for each device contains exactly the same flags, modulo
input vs. output flags. Wine has logic to handle this flag, but if it's never
given, then it just picks the first one. That's what's happening here.

On the other hand, if you follow the PCM_CAP_DEFAULT link[2], you find that it
says that flag is completely useless! Why even have it then??? Audio API
developers are universally terrible. I'm getting really tired of this.

So it seems there's no reliable way to get the default device. I wonder if
there's a way to get the "true" device behind /dev/dsp, like [2] recommends.
I'll investigate along these lines and report back.

[1] http://manuals.opensound.com/developer/audio_capabilities.html
[2] http://manuals.opensound.com/developer/PCM_CAP_DEFAULT.html

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