Re: Sound translator

[Robert Millan]

El 19/09/15 a les 01:06, Olaf Buddenhagen ha escrit:
> This could work -- but I'm not sure it would be very useful? Is there
> any actual logic that could be split out into the audio and mixer
> translators? My suspicion is that they would rather just be
> straightforward wrappers -- in which case it seems an unnecessary
> complication...

That depends on the sound API you want to provide to applications.

Rump doesn't implement OSS, but rather "Sun audio", which seems to be an
ancestor of OSS, with very similar design.

So if you wanted Sun audio, then yes it's a 1:1 wrapper. Otherwise you
have to convert.

I find OSS more useful than Sun audio myself, so I hacked a modified
version of libossaudio (a conversion library included with NetBSD). This
required a few changes to:

  - Make libossaudio use Rump as backend, rather than /dev/audio from the host

  - Make it build with non-NetBSD version of <sys/soundcard.h>. My changes
    were for the Linux version but when I checked on GNU/Hurd it just needed
    minor adjustments.

  - Use modified versions of <sys/audioio.h> to define Rump _IOC* macros without
    namespace collision with system-wide ioctls.

See:

  https://github.com/robertmillan/rumposs

--
Robert Millan