def doChangeTempo(midiObject, proportion):
tempoChangeEvts = getTempoChangeEvents(midiObject)
if len(tempoChangeEvts) == 0:
evt = bmidilib.BMidiEvent()
evt.type = 'SET_TEMPO'
evt.time = 0
evt.data = bmidilib.tempoToData(int(STANDARDTEMPO / float(proportion)))
midiObject.tracks[0].events.insert(0, evt)
else:
for evt in tempoChangeEvts:
oldTempo = bmidilib.dataToTempo(evt.data)
evt.data = bmidilib.tempoToData(int(oldTempo / float(proportion)))
return None #signal that we modified the object, not returned a copy
def doChangeTempo(midiObject, proportion): tempoChangeEvts = getTempoChangeEvents(midiObject) if len(tempoChangeEvts)==0: evt = bmidilib.BMidiEvent() evt.type = 'SET_TEMPO' evt.time = 0 evt.data = bmidilib.tempoToData( int(STANDARDTEMPO / float(proportion))) midiObject.tracks[0].events.insert(0, evt) else: for evt in tempoChangeEvts: oldTempo = bmidilib.dataToTempo(evt.data) evt.data = bmidilib.tempoToData( int(oldTempo / float(proportion))) return None #signal that we modified the object, not returned a copy
def queryChangeTempo(midiObject, default=None): if default==None: default=1.0 tempoChangeEvts = getTempoChangeEvents(midiObject) firstTempo = STANDARDTEMPO if len(tempoChangeEvts)==0 else bmidilib.dataToTempo(tempoChangeEvts[0].data) # convert to bpm # tempo is in microseconds per beat (quarter note). microsecondsPerBeat = float(firstTempo) beatsPerSecond = (1/microsecondsPerBeat)/(1.0e-6) beatsPerMinute = beatsPerSecond * 60 strPrompt = 'The current bpm is %d.' % int(beatsPerMinute) strPrompt += '\n Increase or decrease the tempo by what proportion?\n\n (Enter 2.0 to be twice as fast, 0.5 to be twice as slow, 1.0 to remain the same.)' res = midirender_util.ask_float(strPrompt, default=default, min=0.0,max=100.0, title='Change Tempo') if res==None or res==False: return None return res
def queryChangeTempo(midiObject, default=None):
if default == None: default = 1.0
tempoChangeEvts = getTempoChangeEvents(midiObject)
firstTempo = STANDARDTEMPO if len(
tempoChangeEvts) == 0 else bmidilib.dataToTempo(
tempoChangeEvts[0].data)
# convert to bpm
# tempo is in microseconds per beat (quarter note).
microsecondsPerBeat = float(firstTempo)
beatsPerSecond = (1 / float(microsecondsPerBeat)) / (1.0e-6)
beatsPerMinute = beatsPerSecond * 60
strPrompt = 'The current bpm is %d.' % int(beatsPerMinute)
strPrompt += '\n Increase or decrease the tempo by what proportion?\n\n (Enter 2.0 to be twice as fast, 0.5 to be twice as slow, 1.0 to remain the same.)'
res = midirender_util.ask_float(strPrompt,
default=default,
min=0.0,
max=100.0,
title='Change Tempo')
if res == None or res == False: return None
return res