20 Feb
2005
20 Feb
'05
5:42 a.m.
Hey all,
So my US428 seems to be behaving now(although with the Layla20
that I just bought, the tascam is being used more as a control
surface then an audio interface). But I can't get any audio input
on channels 3 and 4. Jack seems unable to start the tascam as a 4
channel device. Is there something I have to do to enable those
channels? Thanks
-spencer
20 Feb
20 Feb
7:28 p.m.
Am Sonntag 20 Februar 2005 10:41 schrieb Spencer Russell:
Hey all,
So my US428 seems to be behaving now(although with the Layla20
that I just bought, the tascam is being used more as a control
surface then an audio interface). But I can't get any audio input
on channels 3 and 4. Jack seems unable to start the tascam as a 4
channel device. Is there something I have to do to enable those
channels? Thanks
hmmmm, have you tried rui's addition to jack's alsa driver?
if so, it could be that one doesn't yet support channel 3+4.
don't know exactly, haven't checked yet.
currently you can use ch 3 and 4 with my usx2y jack driver.
best regards,
Karsten
21 Feb
21 Feb
3:31 a.m.
I'm using jackd 0.99.50, which I thought had Rui's usx2y patch.
Perhaps I need to patch something manually?
Thanks,
spencer
On Mon, Feb 21, 2005 at 12:28:32AM +0100, Karsten Wiese wrote:
Am Sonntag 20 Februar 2005 10:41 schrieb Spencer
Russell:
Hey all,
So my US428 seems to be behaving now(although with the Layla20
that I just bought, the tascam is being used more as a control
surface then an audio interface). But I can't get any audio input
on channels 3 and 4. Jack seems unable to start the tascam as a 4
channel device. Is there something I have to do to enable those
channels? Thanks
hmmmm, have you tried rui's addition to jack's alsa driver?
if so, it could be that one doesn't yet support channel 3+4.
don't know exactly, haven't checked yet.
currently you can use ch 3 and 4 with my usx2y jack driver.
best regards,
Karsten
5:07 a.m.
Spencer Russell wrote:
I'm using jackd 0.99.50, which I thought had
Rui's usx2y patch.
Perhaps I need to patch something manually?
Is this about having 4 playback ports on the jackd alsa_pcm backend driver?
To speak the truth, I've never seen such a setup, either with the (my) new
alsa driver (from jackd 0.99.42) nor with karten's original one. But
that's probable, due to the fact that I own a US-224, and I'm happy with 2
channels which, I repeat, its what I ever seen.
BTW, shouldn't the US-428 have 8 playback channels, the US-224 have 4, and
finally 2 for US-122?
Karsten, would you kindly checkon whether this makes sense? Is there
anything (that I) left behind? Things to check are about:
- using standard "alsa" driver code-path against "hw:N"
- using (my) experimental "alsa" driver against "hw:N,2" (rawusb)
- using yours original patch for the "usx2y" driver against "hw:N"
and see if whether there is any difference regarding the number of
channels for the US-428. IMO the correct number of channels should be
present on ALL of the above.
Feel free to point out if I did any mistake ;)
Cheers.
--
rncbc aka Rui Nuno Capela
rncbc(a)rncbc.org
On Mon, Feb 21, 2005 at 12:28:32AM +0100, Karsten Wiese wrote:
Am Sonntag 20 Februar 2005 10:41 schrieb Spencer
Russell:
Hey all,
So my US428 seems to be behaving now(although with the Layla20
that I just bought, the tascam is being used more as a control
surface then an audio interface). But I can't get any audio input
on channels 3 and 4. Jack seems unable to start the tascam as a 4
channel device. Is there something I have to do to enable those
channels? Thanks
hmmmm, have you tried rui's addition to jack's alsa driver?
if so, it could be that one doesn't yet support channel 3+4.
don't know exactly, haven't checked yet.
currently you can use ch 3 and 4 with my usx2y jack driver.
best regards,
Karsten
12:05 p.m.
The US428 has 4 capture channels and 2 playback channels. Capture
channels 3 and 4 are switchable between analog and digital. The
button to switch doesn't seem to do anything, though.
-spencer
On Mon, Feb 21, 2005 at 09:05:32AM +0000, Rui Nuno Capela wrote:
BTW, shouldn't the US-428 have 8 playback channels, the US-224 have 4, and
finally 2 for US-122?
1:12 p.m.
Spencer Russell wrote:
The US428 has 4 capture channels and 2 playback
channels. Capture
channels 3 and 4 are switchable between analog and digital. The
button to switch doesn't seem to do anything, though.
-spencer
On Mon, Feb 21, 2005 at 09:05:32AM +0000, Rui Nuno Capela wrote:
>
> BTW, shouldn't the US-428 have 8 playback channels, the US-224 have 4,
> and finally 2 for US-122?
>
I took a quick look into Karsten's original jackd usx2y_driver code and...
I'm affraid that the number of channels were being hardcoded as 2 for
capture and 2 for playback.
OTOH already in the current jack CVS trunk, the number of channels are
either given on the jackd command line (-i,-o) or taken from the maximum
allowed by the ALSA driver (via snd_pcm_hw_params_get_channels_max()).
Maybe its around here where the issue is? Karsten?
I could also check that the jackd usx2y specific code has support for no
more than 4 capture and 2 playback channels.
What happens when you start jackd explicitly for 4 input channels (-i4)?
e.g. jackd -R -d alsa -d hw:N[,2] -i4 -o2
I'll remember to try this myself, when I get home.
Take care.
--
rncbc aka Rui Nuno Capela
rncbc(a)rncbc.org
8:45 p.m.
Am Montag 21 Februar 2005 18:09 schrieb Rui Nuno Capela:
Spencer Russell wrote:
yes , us428 has 4 ins & 2 outs. to make it work with latest jack alsa driver,
you have to hardcode 2 in channels in jack/drivers/alsa/alsa_driver.c like this:
The US428 has 4 capture channels and 2 playback
channels. Capture
channels 3 and 4 are switchable between analog and digital. The
button to switch doesn't seem to do anything, though.
-spencer
On Mon, Feb 21, 2005 at 09:05:32AM +0000, Rui Nuno Capela wrote:
>
> BTW, shouldn't the US-428 have 8 playback channels, the US-224 have 4,
> and finally 2 for US-122?
>
I took a quick look into Karsten's original jackd usx2y_driver code and...
I'm affraid that the number of channels were being hardcoded as 2 for
capture and 2 for playback.
OTOH already in the current jack CVS trunk, the number of channels are
either given on the jackd command line (-i,-o) or taken from the maximum
allowed by the ALSA driver (via snd_pcm_hw_params_get_channels_max()).
Maybe its around here where the issue is? Karsten?
I could also check that the jackd usx2y specific code has support for no
more than 4 capture and 2 playback channels.
>>>>>>
---
alsa_driver.c.~1.65.~ 2005-02-22 01:15:07.000000000 +0100
+++ alsa_driver.c 2005-02-22 01:16:32.000000000 +0100
@@ -450,7 +450,7 @@
}
if ((err = snd_pcm_hw_params_set_channels (handle, hw_params,
- *nchns)) < 0) {
+ 2 /* *nchns*/)) < 0) {
jack_error ("ALSA: cannot set channel count to %u for %s",
*nchns, stream_name);
return -1;
<<<<<<<
confusing, no? (even annoying, if you also use other cards with more than 2 in
channels...)
its because the alsa layer doesn't correctly know about us428's channels 3 + 4.
in raw-usb mode some standard parts of alsa pcm are bypassed, and so currently you can
only use
us428's 4 in channels with the above hack.
It works only, if you call jackd like this:
$jackd -dalsa -dhw:n,2
with n being the us428 alsa card nr.
You have to use latest snd-usb-usx2y, which is already in kernel >= 2.6.11-rc3 .
and it only works with jack. plain alsa only knows us428's first 2 channels.
beware of calling jackd with -dhw:n,1! it can crash your machine as i just experienced.
digital in doesn't yet work.
will make the above hack obsolete hopefully before spring;-)
best regards,
Karsten
22 Feb
22 Feb
5:28 a.m.
Hi Karsten,
Am Montag 21 Februar 2005 18:09 schrieb Rui Nuno
Capela:
jack/drivers/alsa/alsa_driver.c like
I took a quick look into Karsten's original jackd usx2y_driver code
and...
I'm affraid that the number of channels were being hardcoded as 2 for
capture and 2 for playback.
OTOH already in the current jack CVS trunk, the number of channels are
either given on the jackd command line (-i,-o) or taken from the maximum
allowed by the ALSA driver (via snd_pcm_hw_params_get_channels_max()).
Maybe its around here where the issue is? Karsten?
I could also check that the jackd usx2y specific code has support for no
more than 4 capture and 2 playback channels.
yes , us428 has 4 ins & 2 outs. to make it work with latest jack alsa
driver, you have to hardcode 2 in channels in this:
I maybe missing something, but is this hack really necessary? Isn't this
equivalent as issuing the jackd command line explicitly with -i2
(--inchannels=2) ?
The default (0) just asks jackd to set the maximum number of channels as
read from the alsa layer, as read from
snd_pcm_hw_params_get_channels_max(). Again, I think is here where the
issue lies: if I'm not teelling you a gross mistake, snd-usb-usx2y should
be hinting here the correct values, either from the US-122, US-224 (mine)
or US-428 (the only one capable of 4 input channels?), whatever is
actually plugged-in.
>>>>>>
---
alsa_driver.c.~1.65.~ 2005-02-22 01:15:07.000000000 +0100
+++ alsa_driver.c 2005-02-22 01:16:32.000000000 +0100
@@ -450,7 +450,7 @@
}
if ((err = snd_pcm_hw_params_set_channels (handle, hw_params,
- *nchns)) < 0) {
+ 2 /* *nchns*/)) < 0) {
jack_error ("ALSA: cannot set channel count to %u for %s",
*nchns, stream_name);
return -1;
<<<<<<<
confusing, no? (even annoying, if you also use other cards with more than
2 in channels...)
its because the alsa layer doesn't correctly know about us428's channels 3
+ 4. in raw-usb mode some standard parts of alsa pcm are
bypassed, and so
currently you can only use
us428's 4 in channels with the above hack.
Surely it's confusing, but you should/must know it better :)
will make the above hack obsolete hopefully before
spring;-)
Take care. Spring its only one moth away ;)
Cheers.
--
rncbc aka Rui Nuno Capela
rncbc(a)rncbc.org
7219
days inactive
7221
days old
linux-audio-user@lists.linuxaudio.org
7 comments
3 participants
participants (3)
-
Karsten Wiese -
Rui Nuno Capela -
Spencer Russell