mirror of
https://github.com/microtherion/VocalEasel.git
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232 lines
6.8 KiB
Python
232 lines
6.8 KiB
Python
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# patAria.py
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"""
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This module is an integeral part of the program
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MMA - Musical Midi Accompaniment.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Bob van der Poel <bob@mellowood.ca>
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"""
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import random
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import MMA.notelen
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import MMA.harmony
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import gbl
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from MMA.common import *
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from MMA.pat import PC
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class Aria(PC):
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""" Pattern class for an aria (auto-melody) track. """
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vtype = 'ARIA'
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notes = []
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selectDir = [1]
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noteptr = 0
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dirptr = 0
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lastChord = None
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lastStype = None
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lastRange = None
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def restoreGroove(self, gname):
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""" Grooves are not saved/restored for aria tracks. But, seqsize is honored! """
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self.setSeqSize()
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def saveGroove(self, gname):
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""" No save done for grooves. """
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pass
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def getPgroup(self, ev):
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""" Get group for aria pattern.
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Fields - start, length, velocity
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"""
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if len(ev) != 3:
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error("There must be n groups of 3 in a pattern definition, "
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"not <%s>" % ' '.join(ev) )
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a = struct()
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a.offset = self.setBarOffset(ev[0])
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a.duration = MMA.notelen.getNoteLen( ev[1] )
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a.vol = stoi(ev[2], "Note volume in Aria definition not int")
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return a
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def setScaletype(self, ln):
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""" Set scale type. """
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ln = lnExpand(ln, "%s ScaleType" % self.name)
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tmp = []
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for n in ln:
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n = n.upper()
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if not n in ( 'CHROMATIC', 'SCALE', 'AUTO', 'CHORD'):
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error("Unknown %s ScaleType. Only Chromatic, Scale (Auto) and Chord are valid" % self.name)
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tmp.append(n)
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self.scaleType = seqBump(tmp)
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if gbl.debug:
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print "Set %s ScaleType: " % self.name,
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printList(self.scaleType)
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def setDirection(self, ln):
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""" Set direction for melody creation.
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This function replaces the pattern function of the same name ...
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the command name is shared, the function is different. Note we
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need to use a different storage name as well since
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self.direction is managed in the PC class.
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"""
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if not len(ln):
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error("There must be at least one value for %s Direction." % self.name)
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self.selectDir = []
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for a in ln:
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if set(a.upper()) == set('R'): # is direction 'r', 'rr', 'rrr', etc.
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if len(a) > 4:
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error("Aria Direction has too much randomness"
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"(Maximum of 4 r's, got %d)." % len(a))
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self.selectDir.append(a.upper())
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else: # not random, has to be an integer -4 ... 4
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a=stoi(a, "Expecting integer value or 'r*'.")
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if a < -4 or a > 4:
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error("Aria direction must be 'r' or -4 to 4, not '%s'" % a)
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self.selectDir.append(a)
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if gbl.debug:
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print "Set %s Direction:" % self.name,
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printList(self.selectDir)
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def restart(self):
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self.ssvoice = -1
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def trackBar(self, pattern, ctable):
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""" Do the aria bar.
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Called from self.bar()
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"""
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sc = self.seq
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unify = self.unify[sc]
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for p in pattern:
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ct = self.getChordInPos(p.offset, ctable)
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if ct.ariaZ:
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continue
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thisChord = ct.chord.tonic + ct.chord.chordType
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stype = self.scaleType[sc]
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chrange = self.chordRange[sc]
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### Generate notelist if nesc.
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if self.lastChord != thisChord or self.lastStype != stype or \
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self.lastRange != chrange:
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self.lastChord = thisChord
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self.lastStype = stype
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self.lastRange = chrange
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if stype == 'CHORD':
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notelist = ct.chord.noteList
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elif stype == 'CHROMATIC':
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notelist = [ ct.chord.rootNote + x for x in range(0,12)]
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else:
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notelist = list(ct.chord.scaleList)
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o=0
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self.notes=[]
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while chrange >= 1:
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for a in notelist:
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self.notes.append(a+o)
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o+=12
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chrange-=1
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if chrange>0 and chrange<1: # for fractional scale lengths
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chrange = int(len(notelist) * chrange)
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if chrange < 2: # important, must be at least 2 notes in a scale
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chrange=2
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for a in notelist[:chrange]:
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self.notes.append(a+o)
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# grab a note from the list
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if self.dirptr >= len(self.selectDir):
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self.dirptr=0
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# the direction ptr is either an int(-4..4) or a string of 'r', 'rr, etc.
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a = self.selectDir[self.dirptr]
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if type(a) == type(1):
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self.noteptr += a
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else:
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self.noteptr += random.choice( range(-len(a), len(a)+1 ))
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if self.noteptr >= len(self.notes):
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if a > 0:
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self.noteptr = 0
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else:
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self.noteptr = len(self.notes)-1
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elif self.noteptr < 0:
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if a < 0:
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self.noteptr = len(self.notes)-1
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else:
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self.noteptr = 0
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note = self.notes[self.noteptr]
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self.dirptr += 1
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# output
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if not self.harmonyOnly[sc]:
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self.sendNote(
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p.offset,
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self.getDur(p.duration),
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self.adjustNote(note),
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self.adjustVolume(p.vol, p.offset))
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if self.harmony[sc]:
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h = MMA.harmony.harmonize(self.harmony[sc], note, ct.chord.noteList)
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strumOffset = self.getStrum(sc)
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for n in h:
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self.sendNote(
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p.offset + strumOffset,
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self.getDur(p.duration),
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self.adjustNote(n),
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self.adjustVolume(p.vol * self.harmonyVolume[sc], -1))
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strumOffset += self.getStrum(sc)
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