hi john and roger-
i wanted to do a portable midi project with python and found pyPortMidi to
be just what i needed. i got it up and running ok, i just have one problem:
once i call Output.Write with a certain timestamp in the future, if i later
call Output.Write again with an earlier timestamp, that message is not sent
until after the first one. shouldn't portmidi process messages in the order
of their timestamps, not the order in which they were sent? i've attached a
small example. this behavior is necessary if you want to use a simple "set
and forget" approach -- send a note-on and its future note-off to channel 0,
then the same thing for another note on channel 1, intended to sound at
close to the same time. but as it is, the note-off of the first blocks the
note-on of the second.
i thought i'd also attach a summary of how to install everything from
scratch, since i just did it. i found simplesynth, which is handy for
standalone laptop work, especially when using multiple channels as my
example does.
is there a searchable archive of the portmidi mailing list? i can only
find:
http://lists.create.ucsb.edu/pipermail/media_api/
thanks for your help and beautiful work!
-erik
following instructions for OSX at:
http://cratel.wichita.edu/cratel/cratel_pyportmidi
i'm on 10.4.11/intel and python 2.6 (
http://www.python.org/ftp/python/2.6/python-2.6-macosx.dmg)
i downloaded:
portmidi:
http://downloads.sourceforge.net/portmedia/portmidi-src-82.zip?modtime=1213390666&big_mirror=0
vmk: http://www.fredrikolofsson.com/software/vmk16osx.sit
pyPortMidi:
http://alumni.media.mit.edu/~harrison/images/pyPortMidi-0.0.3.zip
pyrex:
http://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/Pyrex-0.9.8.5.tar.gz
simplesynth: http://notahat.com/downloads/SimpleSynth-1.0.zip
1) according to portmidi readme, in portmidi directory, i did:
make -f pm_mac/Makefile.osx
output seemed OK
note pyPortMidi's readme says to use "xcodebuild -project pm_mac.pbproj"
from inside pm_mac directory -- i didn't do this
2) according to pyrex INSTALL.txt, in pyrex directory, i did:
python setup.py install
output seemed OK
i did not edit Pyrex/Mac/DarwinSystem.py. the os.environ line was at a much
higher line number than 21 in this version. it read:
os.environ["MACOSX_DEPLOYMENT_TARGET"] = "10.3"
3) copy the following
portmidi/porttime/porttime.h -> pyPortMidi
portmidi/pm_common/portmidi.h -> pyPortMidi
portmidi/pm_mac/libportmidi.a -> pyPortMidi/OSX
portmidi/porttime/libporttime.a -> pyPotMidi/OSX
4) changed line in pypm.pyx to:
while(Pm_Poll(self.midi) != pmNoError):
5) changed line in pyPortMidi's setup.py to:
libraries = ["portmidi", "porttime"],
6) deleted pyPortMidi's build directory (from previous failed build before i
did steps 4-6)
7) in pyPortMidi directory:
sudo python setup.py install
output seemed OK
8) start simplesynth, make sure 'simple synth virtual input' is midi source
9) in pyPortMidi directory:
python test.py
output works
10) start vmk, make sure 'from vmk 1' is midi port
11) in pyPortMidi directory:
python test.py
input works
note: i didn't understand how to use vmk to test portmidi independent of
pyPortMidi, as suggested on john's wiki
import pypm
def playChord(MidiOut,notes,chan,vel,dur,time):
ChordList = []
for i in range(len(notes)):
ChordList.append([[0x90 + chan,notes[i],vel], time])
MidiOut.Write(ChordList)
ChordList = []
for i in range(len(notes)):
ChordList.append([[0x90 + chan,notes[i],0], time+dur*1000])
MidiOut.Write(ChordList)
def test():
latency=200 #latency is in ms, 0 means ignore timestamps
dev = 0
MidiOut = pypm.Output(dev, latency)
tempo=100
dur=60.0/tempo/2
notes=[60, 63, 67]
n=0
t=pypm.Time() #current time in ms
while n<10:
t+=2*dur*1000
playChord(MidiOut,[notes[0]-12],1,127,dur,t)
playChord(MidiOut,notes,0,60,dur,t)
n+=1
while pypm.Time()<t+2*dur*1000: pass
del MidiOut
pypm.Initialize()
test()
pypm.Terminate()
_______________________________________________
media_api mailing list
media_api@create.ucsb.edu
http://lists.create.ucsb.edu/mailman/listinfo/media_api
