Subject: [linux-audio-user] Re: More Midisport 2x2 troubles (help from the Alsa developers is greatly appreciated!)
From: Ivica Bukvic (ico_AT_fuse.net)
Date: Fri Apr 04 2003 - 03:23:32 EEST
Hmm, I've tried running the alsa-lib/test/ramidi test and tried using it
as:
rawmidi -i hw:2,0
This starts it up but I don't get any events in. Can anyone tell me why?
Any other setting (i.e. hw:2,1) reports an error that such a device was
not found.
Interesting thing is that when I do ./rawmidi -o hw:2,0 I get the
note-on/off signal on the midisport, which means that the send part of
it works ok.
However, when I do -i nothing comes into the cpu.
Same is with the ./rawmidi -I /dev/midi2 (there are no errors, but no
input either).
cat /dev/midi2 works just fine.
My /dev/snd/ only has 1 midi device (midiC2D0), so it does seem like
it's a problem with Alsa.
Running latency in the same dir freezes the machine with a loud sound
going on.
I am using MDK 9.1 on Inspiron 8200. Any help is greatly appreciated!
Any other suggestions?
Ico
> -----Original Message-----
> From: aezr4_AT_studcom.urz.uni-halle.de [mailto:aezr4_AT_studcom.urz.uni-
> halle.de] On Behalf Of Clemens Ladisch
> Sent: Thursday, April 03, 2003 9:50 AM
> To: Ivica Bukvic
> Cc: alsa-devel_AT_lists.sourceforge.net
> Subject: Re: [Alsa-devel] Re: More Midisport 2x2 troubles
>
> Ivica Bukvic wrote:
> > However, I am a bit confused, since this feature with /dev/midi
stuff
> > worked like a charm just a couple weeks ago (ver. 0.9.1). So, did
> > something change dramatically since?
>
> No. The USB MIDI driver has behaved in this way since 0.9.0rc4.
>
> > Can you also point me in the right direction where I can see a
simple
> > ALSA code to accessing the both of the MIDI raw ports?
>
> alsa-lib/test/rawmidi.c does some operations with both OSS and ALSA
ports.
> When using two ports, you'd call snd_rawmidi_open() twice and then
have
> two handles, similar to two file handles.
> alsa-lib/test/control.c enumerates rawmidi devices.
>
> BTW: Are you soure you want to use rawmidi ports? Many software
> synthesizers create sequencer ports only.
>
> > P.S. One thing I just realized is that there is something rather
unclear
> > to me in the explanation generously provided by Clemens:
> >
> > > /dev/midi0 -> card 0, device 0, subdevice 0
> > > /dev/amidi0 -> card 0, device 1, subdevice 0
> > > /dev/midi1 -> card 1, device 0, subdevice 0
> > > /dev/amidi1 -> card 1, device 1, subdevice 0
> > > /dev/midi2 -> card 2, device 0, subdevice 0
> > > /dev/amidi2 -> card 2, device 1, subdevice 0
> >
> > since none of the amidi devices does not work on my setup (see my
last
> > e-mail for more info) and it seems as if it should.
>
> Your two ports are subdevices 0 and 1 of card 1, device 0.
> /dev/amidi1 points to device 1 which doesn't exist.
>
> > Furthermore, what happens when the midi interface has more than 2
I/O
> > ports?
>
> If the ports are subdevices of one device, only the first can be
accessed
> with the OSS /dev/midiX file.
> If each port is a seperate device, the first two ports can be accessed
> with /dev/midiX and /dev/amidiX.
>
> Drivers for multiport interfaces usually use the first alternative
(one
> device with subdevices) because there is a limit of 8 rawmidi devices
per
> card.
>
>
> HTH
> Clemens
>
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