Python music sequencer timing problems
mail at johnohagan.com
Mon Dec 15 04:32:08 CET 2008
On Sun, 14 Dec 2008, Bad Mutha Hubbard wrote:
> John O'Hagan wrote:
> > On Wed, 10 Dec 2008, badmuthahubbard wrote:
> > from time import time, sleep
> > start = time()
> > for event in music:
> > duration=len(event) #Really, the length of the event
> > play(event)
> > while 1:
> > timer = time()
> > remaining = start + duration - timer
> > if remaining < 0.001:
> > break
> > else:
> > sleep(remaining / 2)
> > stop(event)
> > start += duration
> Very interesting approach, halving the remaining duration. Right now
> I'm not working with note-offs, Csound takes care of the duration. I
> just need to be able to call the notes at the right times.
I'm also using the above code without the "stop(event)" line for playing
non-midi stuff (fixed-length samples for example), which from the sound of it
also applies to your requirement - IOW, you _can_ use it just to start notes
at the right time, because the note-playing loop sleeps till then.
> I also like and respect Fluidsynth, but I'm working on a pretty
> microtonal system, and MIDI doesn't have enough microtonal support.
I'm certainly not trying to convert you to Fluidsynth - I'm more likely to
convert to Csound - but just for the record, you can do microtonal stuff
fairly easily using Fluidsynth's "settuning" command. In my program I can use
any equal-tempered division of the octave by preceding each set of events
which require it with this:
mesg = [ "select " + channel + " " + font
+ " " + bank+ " " + program +
" \ntuning name 0 " + program + "\n"]
for key in xrange(128):
pitch = str((((key - 60) * 12.0 / divisor) + 60) * 100)
mesg.append( "tune " + bank + " " + program
+ " " + str(key) + " " + pitch + "\n")
mesg.append("settuning " + channel + " "
+ bank " " + program + "\n")
mesg = ''.join(mesg)
where "divisor" is the number you want to divide the octave by (the other
names are self-descriptive). The reason for the "60"s in there is just to
keep middle C where it is.
For more complex/non-linear pitch-warping, the rest of the "pitch = " line
could be replaced with any pitch-altering function taking "key" as an
argument; but I haven't tried that yet.
I'd be interested to hear about the microtonal system(s) you're using.
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