Date: Fri, 22 Apr 2005 13:39:16 +0900 (JST) From: Kazuhito HONDA <kazuhito@ph.noda.tus.ac.jp> To: zazubrik@mail.ru Cc: freebsd-multimedia@freebsd.org Subject: Re: uaudio in full duplex Message-ID: <20050422.133916.343183478.kazuhito@ph.noda.tus.ac.jp> In-Reply-To: <bf1230e8e54b0a986844371a3602d87b@mail.ru> References: <bf1230e8e54b0a986844371a3602d87b@mail.ru>
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Hello,
the uaudio driver doesn't allow USB devices to
open playback and record channel pipe, simultaneously,
if in FreeBSD-stable, at line 3650 of uaudio.c as below:
if ((sc->sc_playchan.pipe != NULL) || (sc->sc_recchan.pipe != NULL))
return (-1);
If you do comment-out it, you may be able to read and write several time.
But USB low-level driver soon freezes with eternal errors messages.
I haven't found its cause.
Sincerely,
Kazuhito HONDA
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