Le Sat, 22 Jan 2011 20:33:10 +0100,
c0 <elcorreodelcoco@xxxxxxxxx> a Ãcrit :
> Hi.
>
> I have not read/understand what you are trying to explain because my
> english level is not native language (sorry). But i can tell you
> something:
>
> For audio works, i recommend you using JACK (with a realtime kernel).
>
> Gracias.
> Chau!
>
> On Sat, 2011-01-22 at 11:07 +0000, Jim Lesurf wrote:
> > Hi,
> >
> > This is my first posting to the email list. I have looked at the
> > archives, but apologies if the following is too far OT or an old
> > chestnut.
> >
> > I'm experimenting with two different USB sound (playing) devices
> > that should be capable of asynchronous transfers up to and
> > including 96k/24bit. The following is when testing a Halide Bridge.
> > Using two systems, but the one relevant here is a Shuttle running
> > Ubuntu.
> >
> > I've successfully arranged for the device(s) I'm trying out to be
> > the 'default' alsa device for playing by including
> >
> > pcm.!default {
> > type plug
> > slave {
> > pcm "hw:2"
> > channels 2
> > format S24_3LE
> > }
> > }
> >
> > in my 'asoundrc' file. (NB there are two other 'soundcards' present
> > and the one I'm testing expect S24_3LE and is hw:2.)
> >
Did you try to fix the card order into /etc/modprobes.d/alsa.conf
instead of inside .asoundrc ?
You can use the options 'index=n' and 'snd cards_limit=x' for that.
Ciao,
Dominique
> > The Halide Bridge converts USB into (coax) SPDIF.
> >
> > If I play a 96k/24 LPCM wave file with the aplay command I can
> > record its SPDIF output with an audio recorder and compare it
> > sample-by-sample with the file I played. Using aplay, the result
> > for the brief tests so far show bit-for-bit correct output values.
> > So that looks like the Bridge and Shuttle hardware are working OK.
> >
> > However if I use Audacious to play a file, the result comes out as
> > 16 bit per sample. i.e. the least significant byte is being
> > ignored/zerod. I have selected the '24 bit' output option, and
> > specified not to use its volume control. I have also selected the
> > 'advanced' option to 'avoid processing' and have selected the
> > default ALSA output.
> >
> > Have I missed something with Audacious? Or is this a known problem?
> > I've found on the web mentions of making sure you select the 24bit
> > output and the 'avoid processing'. And apart from the missing
> > bottom 8 bits the values don't immediately look 'altered' in other
> > ways. Not looked yet in detail though as the loss of the lowest
> > bytes is the obvious symptom!
> >
> > Can give more details if asked, but at present not sure what to add
> > and wish to avoid taking up too much space if this is OT or a
> > chestnut.
> >
> > Thanks in advance for any help,
> >
> > Jim
> >
>
>
>
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