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import random
import common.Config as Config
from common.Generation.GenerationConstants import GenerationConstants
from common.Generation.Utils import *
from common.Util import InstrumentDB
class GenRythm:
def drumRythmSequence(self, instrumentName, nbeats, density, regularity ):
instrumentDB = InstrumentDB.getRef()
rythmSequence = []
binSelection = []
downBeats = []
upBeats = []
beats = []
countDown = 0
onsetTime = None
if instrumentDB.instNamed[instrumentName].instrumentRegister == Config.PUNCH:
registerDensity = 0.5
downBeatRecurence = 4
downBeats = [x for x in GenerationConstants.DRUM_PUNCH_ACCENTS[ nbeats ]]
for downBeat in downBeats:
upBeats.append( downBeat + Config.TICKS_PER_BEAT / 2 )
if instrumentDB.instNamed[instrumentName].instrumentRegister == Config.LOW:
registerDensity =1
downBeatRecurence = 4
downBeats = [x for x in GenerationConstants.DRUM_LOW_ACCENTS[ nbeats ]]
for downBeat in downBeats:
upBeats.append( downBeat + Config.TICKS_PER_BEAT / 2 )
if instrumentDB.instNamed[instrumentName].instrumentRegister == Config.MID:
registerDensity = .75
downBeatRecurence = 1
downBeats = [x for x in GenerationConstants.DRUM_MID_ACCENTS[ nbeats ]]
for downBeat in downBeats:
upBeats.append( downBeat + Config.TICKS_PER_BEAT / 4 )
if instrumentDB.instNamed[instrumentName].instrumentRegister == Config.HIGH:
registerDensity = 1.5
downBeatRecurence = 1
downBeats = [x for x in GenerationConstants.DRUM_HIGH_ACCENTS[ nbeats ]]
for downBeat in downBeats:
upBeats.append( downBeat + Config.TICKS_PER_BEAT / 4 )
realDensity = density * registerDensity
if realDensity > 1.:
realDensity = 1.
list = range( int( realDensity * len( downBeats ) ) )
for i in list:
if random.random() < ( regularity * downBeatRecurence ) and binSelection.count( 1 ) < len( downBeats ):
binSelection.append( 1 )
else:
if binSelection.count( 0 ) < len( downBeats ):
binSelection.append( 0 )
else:
binSelection.append( 1 )
countDown = binSelection.count( 1 )
length = len(downBeats) - 1
for i in range( countDown ):
ran1 = random.randint(0, length)
ran2 = random.randint(0, length)
randMin = min(ran1, ran2)
onsetTime = downBeats.pop(randMin)
rythmSequence.append( onsetTime )
length -= 1
length = len(upBeats) - 1
for i in range( len( binSelection ) - countDown ):
ran1 = random.randint(0, length)
ran2 = random.randint(0, length)
randMin = min(ran1, ran2)
onsetTime = upBeats.pop(randMin)
rythmSequence.append( onsetTime )
length -= 1
rythmSequence.sort()
return rythmSequence
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