[linux-audio-user] on ALSA's virmidi module
clemens at ladisch.de
Mon Oct 20 05:59:56 EDT 2003
Frank Barknecht wrote:
> Dave Phillips hat gesagt: // Dave Phillips wrote:
> > export ALSA_RAWMIDI_DEVICE=hw:1,0
> Cool. But I find it a bit strange, that Keyit uses the PCM definition
> for midi access.
This isn't a PCM definition, it's a RawMIDI definition (which happens
to have the same name). All ALSA devices implemented in the kernel are
accessed by a plugin named "hw". See /usr/share/alsa/conf/alsa.conf
for the various definitions (pcm, ctl, rawmidi, seq, hwdep, timer).
It's possible to give some rawmidi port its own name, just like pcms:
then you could use my_virtual instead of hw:1,0.
Another useful plugin (the only other currently available
rawmidi plugin) is the virtual rawmidi device, which is implemented in
user space and doesn't need the snd-virmidi kernel driver.
If you use "virtual" instead of "hw:1,0", each application using this
will create a virtual sequencer port on the fly. (This may not be what
you want, because each application instance will create a seperate
virtual device, and the port exists only as long as the application is
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