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https://github.com/microtherion/VocalEasel.git
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264 lines
6.5 KiB
Python
264 lines
6.5 KiB
Python
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# volume.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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from MMA.common import *
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""" Volumes are specified in musical terms, but converted to
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midi velocities. This table has a list of percentage changes
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to apply to the current volume. Used in both track and global
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situations. Note that the volume for 'ffff' is 200%--this will
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most likely generate velocities outside the midi range of 0..127.
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But that's fine since mma will adjust volumes into the valid
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range. Using very high percentages will ensure that 'ffff' notes
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are (most likely) sounded with a maximum velocity.
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"""
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vols={ 'OFF': 0.00, 'PPPP': 0.05, 'PPP': 0.10,
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'PP': 0.25, 'P': 0.40, 'MP': 0.70,
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'M': 1.00, 'MF': 1.10, 'F': 1.30,
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'FF': 1.60, 'FFF': 1.80, 'FFFF': 2.00 }
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volume = vols['M'] # default global volume
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nextVolume = None # main parser sets this to the next volume
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# when future volumes are stacked. It's used
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# by the volume adjust to smooth out (de)crescendos.
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lastVolume = volume
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futureVol = []
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vTRatio = .6
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vMRatio = 1-vTRatio
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def adjvolume(ln):
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""" Adjust the ratio used in the volume table and track/global ratio. """
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global vols, vTRatio, vMRatio
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if not ln:
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error("Use: AdjustVolume DYN=RATIO [..]")
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notopt, ln = opt2pair(ln, 1)
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if notopt:
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error("ADJUSTVOLUME: Expecting DYNAMIC=RATIO pairs" )
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for v, r in ln:
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if v == 'RATIO':
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r=stof(r)
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if r<0 or r>100:
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error("ADJUSTVOLUME RATIO: value must be 0 to 100")
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vTRatio = r/100
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vMRatio = 1-vTRatio
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elif v in vols:
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vols[v] = calcVolume(r, vols[v])
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else:
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error("ADJUSTVOLUME DYNAMIC: '%s' for AdjustVolume is unknown" % v )
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if gbl.debug:
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print "Volume Ratio: %s%% Track / %s%% Master" % ( vTRatio * 100, vMRatio * 100)
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print "Volume table:",
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for a in sorted(vols):
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print "%s=%s" % (a, int(vols[a] * 100)),
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print
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def calcVolume(new, old):
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""" Calculate a new volume "new" possibly adjusting from "old". """
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if new[0] == '-' or new[0] == '+':
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a = stoi(new, "Volume expecting value for %% adjustment, not %s" % new)
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v = old + (old * a/100.)
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if v < 0:
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v=0
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warning("Volume adjustment results in 0 volume.")
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elif new[0] in "0123456789":
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v = stoi(new, "Volume expecting value, not '%s'" % new) / 100.
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else:
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new = new.upper()
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adj = None
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if '+' in new:
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new,adj = new.split('+')
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elif '-' in new:
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new,adj = new.split('-')
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adj = '-' + adj
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if not new in vols:
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error("Unknown volume '%s'" % new)
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v=vols[new]
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if adj:
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a = stoi(adj, "Volume expecting adjustment value, not %s" % adj)
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v += (v * (a/100.))
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return v
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def setVolume(ln):
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""" Set master volume. """
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global volume, lastVolume, futureVol
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lastVolume = volume
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if len(ln) != 1:
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error ("Use: Volume DYNAMIC")
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volume = calcVolume(ln[0], volume)
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futureVol = []
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if gbl.debug:
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print "Volume: %s%%" % volume
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# The next 3 are called from the parser.
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def setCresc(ln):
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""" Master Crescendo. """
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setCrescendo(1, ln)
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def setDecresc(ln):
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""" Master Decrescendo (Diminuendo). """
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setCrescendo(-1, ln)
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def setSwell(ln):
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""" Set a swell (cresc<>decresc). """
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global futureVol, volume, lastVolume
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lastVolume = volume
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if len(ln) == 3: # 3 args, 1st is intial setting
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setVolume([ln[0]])
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ln=ln[1:]
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if len(ln) != 2:
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error("Swell expecting 2 or 3 args.")
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count = stoi(ln[1])
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if count < 2:
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error("Swell bar count must be 2 or greater.")
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if count % 2:
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c=(count+1)/2
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offset=1
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else:
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c=count/2
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offset=0
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c=str(c)
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futureVol = fvolume(0, volume, [ ln[0], c ] )
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futureVol.extend(fvolume(0, futureVol[-1],
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[str(int(volume*100)), c ])[offset:])
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if gbl.debug:
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print "Set Swell to:",
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for a in futureVol:
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print int(a*100),
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print
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def setCrescendo(dir, ln):
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""" Combined (de)cresc() """
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global futureVol, volume, lastVolume
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lastVolume = volume
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if len(ln) not in (2, 3):
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error("Usage: (De)Cresc [start-Dynamic] final-Dynamic bar-count")
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if len(ln) == 3:
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setVolume([ln[0]])
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ln=ln[1:]
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futureVol = fvolume(dir, volume, ln)
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if gbl.debug:
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print "Set (De)Cresc to:",
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for a in futureVol:
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print int(a*100),
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print
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# Used by both the 2 funcs above and from TRACK.setCresc()
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def fvolume(dir, startvol, ln):
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""" Create a list of future vols. Called by (De)Cresc. """
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# Get destination volume
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destvol = calcVolume(ln[0], startvol)
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bcount = stoi(ln[1], "Type error in bar count for (De)Cresc, '%s'" % ln[1] )
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if bcount <= 0:
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error("Bar count for (De)Cresc must be postive")
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# Test to see if (de)cresc is contrary to current settings.
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# Using 'dir' of 0 will bypass this (used by SWELL).
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if dir > 0 and destvol < startvol:
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warning("Cresc volume less than current setting" )
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elif dir < 0 and destvol > startvol:
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warning("Decresc volume greater than current setting" )
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elif destvol == startvol:
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warning("(De)Cresc volume equal to current setting" )
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if bcount> 1:
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bcount -= 1
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step = ( destvol-startvol ) / bcount
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volList=[startvol]
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for a in range(bcount-1):
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startvol += step
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volList.append( startvol)
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volList.append(destvol)
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return volList
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