Subject: [linux-audio-dev] MIDI reset?
From: Paul Winkler (slinkp_AT_ulster.net)
Date: pe marras 12 1999 - 11:46:49 EST
Hi,
I'm monkeying around with little python scripts that write to
/dev/midi
(I have a soundcard with a wavetable synth, and it's possible to
play it this way). (In fact, I have sometimes had some perverse fun
by doing cat "foo" > /dev/midi, where "foo" is anything -- a binary,
a soundfile, picture, core, etc...)
Trouble is, since I don't really know what I'm doing :), I
frequently get the soundcard "stuck"-- it won't respond to any more
midi commands, and
I can't even unload the driver (OSS-Linux 3.9.h-something-- running
"soundoff" just gives a bunch of "device or resource in use"
messages; likewise for trying to do rmmod by hand). This seems to
happen with a large number of note-ons without specific note-offs,
e.g. when doing fast percussion stuff.
I've tried writing a "reset" (first byte is 0xFF) to the soundcard,
but that doesn't seem to help. I'm not sure if anything is getting
through. The only solution at the moment is to reboot-- yuck.
Any ideas, anyone? I haven't used ALSA in a while -- is the midi
interface useable yet? Would ALSA have the same problem, or is it
more likely hardware?
BTW, here's an example of what I've been doing today-- trivial and
goofy, but fun:
import time
import whrandom
import struct
def drumbug(tempo, dur):
s = 60.0 / tempo
hits = dur / s
possibles = range(0, 128)
while hits > 0:
note = whrandom.choice(possibles)
vel = whrandom.choice(range(80, 128))
## print note, vel
# I got using struct.pack this way from eric s. t.
sys.stdout.write(struct.pack('BBB', 0x99, note, vel))
sys.stdout.flush()
time.sleep(s)
hits = hits - 1
# end
-- PW
---------------- paul winkler ------------------
slinkP arts: music, sound, illustration, design, etc.
A member of ARMS:
www.reacharms.com - www.mp3.com/arms - www.amp3.com/arms
personal page: www.ulster.net/~abigoo
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