Date: Wed, 23 Aug 2006 11:51:24 +0400 From: "Yuriy Tsibizov" <Yuriy.Tsibizov@gfk.ru> To: "Ryan Beasley" <ryanb@FreeBSD.org> Cc: current@FreeBSD.org, multimedia@FreeBSD.org Subject: RE: [RFC] Summer of Code -- OSSv4 audio compatibility Message-ID: <78664C02FF341B4FAC63E561846E3BCC546A@ex.hhp.local> In-Reply-To: <44EB72FC.8040508@FreeBSD.org>
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> Hello, current@ & multimedia@! >=20 > =3D=3D=3D=3D=3D=3D Summary =3D=3D=3D=3D=3D=3D > I participated in Google's Summer of Code this year, working on adding > support for 4Front's OSSv4 API. >=20 > Unfortunately, more of the API specifications were still under > construction than I expected, so I focused entirely on the audio > collection of ioctls and maybe just one or two mixer ioctls. While > official documentation isn't yet available, the mixer=20 > extensions, which > are one of the coolest parts of the new API, are my top priority. (I > think I now have enough reference material to begin work in=20 > that area.) >=20 > For information on the ioctls, please take a look at > http://wiki.freebsd.org/RyanBeasley/ioctlref . >=20 > =3D=3D=3D=3D=3D=3D Patch Info =3D=3D=3D=3D=3D=3D > A patch against recent -CURRENT is available at > http://www.leidinger.net/FreeBSD/sound/rbeasley_sound.diff . >=20 > Comments, suggestions, etc., would be hugely appreciated! Ryan, will there be any changes for hardware drivers? And, as I know you have emu10kx-compatible sound card, can you=20 test your sound buffering changes with EMU_PLAY_BUFSZ set to=20 EMUPAGESIZE*2 or larger (dev/sound/pci/emu10kx.h, line49). With 4K (=3DEMUPAGESIZE) playback buffer sound does not has lag or lost samples, but there was problems with large one (http://docs.freebsd.org/cgi/mid.cgi?D562966835368E4C8DDF68BC113A97B15F0 643). On opposite side, with small buffer I have a lot of noise when my system has a lot of disk activity or kernel printf's. You can use http://www.linksplace.com/wavsounds/pong.wav as a good sample of "bad file" for large buffer. Yuriy.
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