mirror of
https://github.com/microtherion/VocalEasel.git
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135 lines
3.2 KiB
Python
135 lines
3.2 KiB
Python
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# patBass.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 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 Bass(PC):
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""" Pattern class for a bass track. """
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vtype = 'BASS'
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def getPgroup(self, ev):
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""" Get group for bass pattern.
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Fields - start, length, note, volume
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"""
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if len(ev) != 4:
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error("There must be n groups of 4 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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offset = ev[2]
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n=offset[0]
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if n in "1234567":
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a.noteoffset = int(n)-1
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else:
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error("Note offset in Bass must be '1'...'7', not '%s'" % n )
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n = offset[1:2]
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if n == "#":
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a.accidental = 1
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ptr = 2
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elif n == 'b' or n == 'b' or n == '&':
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a.accidental = -1
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ptr = 2
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else:
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a.accidental = 0
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ptr = 1
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a.addoctave = 0
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for n in ev[2][ptr:]:
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if n == '+':
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a.addoctave += 12
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elif n == '-':
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a.addoctave -= 12
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else:
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error("Only '- + # b &' are permitted after a noteoffset, not '%s'" % n)
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a.vol = stoi(ev[3], "Note volume in Bass definition not int")
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return a
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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 bass 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.bassZ:
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continue
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note = ct.chord.scaleList[p.noteoffset] + p.addoctave + p.accidental
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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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for n in h:
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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(n),
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self.adjustVolume(p.vol * self.harmonyVolume[sc], -1))
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