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https://github.com/microtherion/VocalEasel.git
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131 lines
3.0 KiB
Python
131 lines
3.0 KiB
Python
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# notelen.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 <bvdp@xplornet.com>
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"""
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import gbl
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from MMA.common import *
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noteLenTable = {
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'0' : 1, # special 0==1 midi tick
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'1' : gbl.BperQ * 4, # whole note
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'2' : gbl.BperQ * 2, # 1/2
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'23' : gbl.BperQ * 4 / 3, # 1/2 triplet
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'4' : gbl.BperQ, # 1/4
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'43' : gbl.BperQ * 2 / 3, # 1/4 triplet
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'8' : gbl.BperQ / 2, # 1/8
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'81' : None, # short 1/8 swing note
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'82' : None, # long 1/8 swing note
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'16' : gbl.BperQ / 4, # 1/16
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'32' : gbl.BperQ / 8, # 1/32
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'64' : gbl.BperQ / 16, # 1/64
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'6' : gbl.BperQ / 6, # 1/16 note triplet
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'3' : gbl.BperQ / 3, # 1/8 note triplet
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'5' : gbl.BperQ / 5 } # 1/8 note quintuplet
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def swingMode(ln):
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""" Enable/Disable Swing timing mode. """
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emsg = "Use: SwingMode [ On, Off, 0, 1 Skew=xx ]."
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if not ln:
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error(emsg)
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for v in ln:
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a = v.upper()
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if a in ("ON", "1"):
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gbl.swingMode = 1
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continue
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if a in ("OFF", "0"):
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gbl.swingMode = 0
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continue
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if a.find('=')>1:
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a,b = a.split('=')
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if a == 'SKEW':
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gbl.swingSkew = b
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v = int( stoi(b) * gbl.BperQ / 100)
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noteLenTable['81'] = v
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noteLenTable['82'] = gbl.BperQ - v
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continue
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error(emsg)
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if gbl.debug:
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print "SwingMode: Status=%s, Skew Note lengths: %s and %s ticks." % \
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(gbl.swingMode, noteLenTable['81'], noteLenTable['82'])
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swingMode(['Skew=66']) # Set the default swingskew values.
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def getNoteLen(n):
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""" Convert a Note to a midi tick length.
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Notes are 1==Whole, 4==Quarter, etc.
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Notes can be dotted or double dotted.
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Notes can be combined: 1+4 == 5 beats, 4. or 4+8 == dotted 1/4
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1-4 == 3 beats, 1-0 == 4 beats less a midi tick
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"""
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length = 0
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n=n.replace('-', '+-') # change "2-4" to "2+-4" for easier parsing
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n=n.replace('++-', '+-') # and in case we already used "+-", take out 2nd "+"
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for a in str(n).split('+'):
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if a.endswith('..'):
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dot = 2
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a=a[:-2]
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elif a.endswith('.'):
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dot = 1
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a=a[:-1]
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else:
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dot = 0
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try:
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if a.startswith('-'):
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i = noteLenTable[a[1:]] * -1
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else:
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i = noteLenTable[a]
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except:
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error("Unknown note duration %s" % n )
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if dot == 2:
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i += i/2 + i/4
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elif dot == 1:
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i += i/2
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length += i
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return length
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