mirror of
https://github.com/microtherion/VocalEasel.git
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172 lines
5.0 KiB
Python
172 lines
5.0 KiB
Python
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# keysig.py
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"""
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The program "MMA - Musical Midi Accompaniment" and the associated
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modules distributed with it are protected by copyright.
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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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Keysignature is used in the solo/melody tracks and for midinote.
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A single instance class is created here and can be accessed from any
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other module.
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"""
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import gbl
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from MMA.common import *
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majKy = { "C" : 0, "G" : 1, "D" : 2,
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"A" : 3, "E" : 4, "B" : 5,
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"F#": 6, "C#": 7, "F" : -1,
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"Bb": -2, "Eb": -3, "Ab": -4,
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"Db": -5, "Gb": -6, "Cb": -7 }
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minKy = { "A" : 0, "E" : 1, "B" : 2,
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"F#": 3, "C#": 4, "G#": 5,
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"D#": 6, "A#": 7, "D" : -1,
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"G" : -2, "C" : -3, "F" : -4,
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"Bb": -5, "Eb": -6, "Ab": -7 }
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class KeySig:
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def __init__(self):
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self.kSig = 0
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self.kName = ['C', 0]
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self.setAccList()
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def set(self,ln):
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""" Set the keysignature. Used by solo tracks. Formats are:
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1. A,D,E, Eb, etc followed by optional minor/major
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flat can be b or &, sharp is #
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2. Number of sharps/flats plus option minor/major
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id 3b or 2#
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"""
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mi = 0 #assume Major
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if len(ln) < 1 or len(ln) > 2:
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error("KeySig: Needs 1 or 2 arguments.")
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# got 2 args, parse off minor/major
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if len(ln) == 2:
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l = ln[1][0:3].upper()
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if l == 'MIN':
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mi = 1
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elif l == 'MAJ':
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mi = 0
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else:
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error("KeySig: 2nd arg must be 'Major' or 'Minor', not '%s'" % ln[1])
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self.kName[1] = mi # remember maj/min setting
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# get the key
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kname = ln[0][0]
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kname = kname.upper()
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if len(ln[0])>1:
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kname += ln[0][1:]
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if kname[0] in "ABCDEFG":
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if len(kname) == 2 and kname[1] == '&':
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kname = kname[0] + 'b'
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if mi and kname in minKy:
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self.kSig = minKy[kname]
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elif not mi and kname in majKy:
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self.kSig = majKy[kname]
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else:
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if mi: mi = 'minor'
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else: mi = 'major'
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error("KeySigs: keysignature '%s %s' is unknown/impossible." % (kname, mi))
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self.kName[0] = kname # save name ('C', "Eb", etc)
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midikey=majKy[kname]
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elif kname[0] in "01234567":
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c = int(kname[0])
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if len(kname) < 2:
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error("KeySig: numerical keysig needs sharp/flat indicator.")
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f = kname[1].upper()
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if not f in ("B", "&", "#"):
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error("KeySig: 2nd char in KeySig must be 'b' or '#', not '%s'" % f)
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self.kSig = midikey = int(c)
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if f in ('B', '&'):
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self.kSig = -self.kSig
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if mi:
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z = minKy
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else:
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z = majKy
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for a in z:
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if z[a]==self.kSig:
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self.kName[0]=a
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break
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else:
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error("KeySig: unknown keysignature '%s'." % ln[0])
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# Set the midi meta track with the keysig. This doen't do anything
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# in the playback, but other programs may use it.
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if midikey < 0:
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midikey = 256 + midikey
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gbl.mtrks[0].addKeySig(gbl.tickOffset, midikey, mi)
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self.setAccList()
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if gbl.debug:
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print "KeySig:", self.getKeysig()
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def getKeysig(self):
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""" Create a key sig string. """
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return "%s %s" % (self.kName[0], ('Major', 'Minor')[self.kName[1]])
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def setAccList(self):
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""" Create a keysig table. This table is created in __init__ and
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when a keysig changes. There is an entry for each note,
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either -1,0,1 corresponding to flat,natural,sharp. We populate
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the table for each bar from the keysig value.
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Melody/solo tracks are given a copy of the table when they can
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then modify.
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"""
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acc = {'a':0, 'b':0, 'c':0, 'd':0, 'e':0, 'f':0, 'g':0 }
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ks=self.kSig
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if ks < 0:
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for a in range( abs(ks) ):
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acc[ ['b','e','a','d','g','c','f'][a] ] = -1
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else:
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for a in range(ks):
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acc[ ['f','c','g','d','a','e','b'][a] ] = 1
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self.accList=acc
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keySig=KeySig() # single instance
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