From owner-freebsd-multimedia@FreeBSD.ORG  Thu Apr 28 13:47:06 2005
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Thu, 28 Apr 2005 15:47:41 +0200
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Subject: Re: uaudio in full duplex
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On Friday 22 April 2005 06:39, Kazuhito HONDA wrote:
> 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:
>
> =A0 =A0 =A0 =A0 if ((sc->sc_playchan.pipe !=3D NULL) || (sc->sc_recchan.p=
ipe !=3D
> 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.

What does the error messages say? It might be a bug in the UHCI driver,=20
because it does currently not check when isochronous transfers are=20
inserted in time !

Yours
=A0 Hans Petter Selasky