For what it's worth, I've isolated the problem a bit more,
and wonder if I'm
looking at a bug in the snd-serial-u16550 driver.
1) It only affects the snd-serial-u16550 driver...I tried a
USB midi device,
and aseqdump works fine.
2) It is the snd_seq_connect_to() call within aplaymidi that
works the magic
on the already running aseqdump. Comment out the call, and
aplaymidi has no
effect on aseqdump. Put it back in, even wth the playfile()
and
create_queue() functions commented out, and aseqdump works
(while aplaymidi
is running).
3) The incoming data to aseqdump() is being queued
somewhere, but somehow
aseqdump doesn't know it. That is, with aseqdump running,
if I send a 'note
on' to the input port, I see nothing, but if I then run
aplaymidi, then
aseqdump shows the 'note on' I sent several seconds before.
John
>From: "r10 kindsofpeople"
<r10kindsofpeople hotmail.com>
>To: alsa-userlists.sourceforge.net
>Subject: [Alsa-user] MIDI input/output interaction
w/snd-serial-u16550
>Date: Wed, 04 Apr 2007 15:52:20 -0500
>
>I'm seeing a strange interaction within ALSA that I
assume is due to
>improper configuration on my part.
>
>I'm using alsa 1.0.14rc1 under Fedora Core 6 with the
snd-serial-u16550
>driver, adaptor 4 (generic).
>
>MIDI playback works fine with programs like aplaymidi.
>
>Incoming MIDI data doesn't seem to get noticed by Alsa
UNLESS aplaymidi is
>running on another stream.
>
>That is, with a continuous stream of data going to port
20:0, in one
>terminal:
>aseqdump -p 20:0
>(no output)
>
>then, in another terminal:
>aplaymidi -p 20:1 01.MID
>at which point, aseqdump starts showing MIDI data from
the original stream
>(not 01.MID) until aplaymidi finishes, at which point
output from aseqdump
>stops.
>
>This behavior is repeatable...I can start aplaymidi
again, and aseqdump
>output starts up again. I can stop the original stream
while 01.MID is
>playing, and aseqdump output stops until I restart the
stream.
>
>I've tried to eliminate problems past the DB9 connector
(handshaking lines,
>etc) and as far as I can tell, everything is working up
to the serial port
>of the PC.
>
>Any ideas?
>
>John
>
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