def emit(self, track): """ Can be called by most child methods by filling in self.data as a string, setting self.type, then calling: Meta_Event.emit(self, track) """ track.append(chr(0xff)) # all meta start with 0xff track.append(chr(self.event_type)) track.append(MFF.vlq(len(self.data))) track.append(self.data)
def create_MFF(self, outfile, txt_file): """ Create a MIDI File Format file - based on the events in the song object - output to previously opened file """ # We emit a header chunk and then one or more track chunks. # create head object, initialize, post to file... head = MFF.Header_Chunk() # initialze the hearder chunk values... head.Init(fformat=self.format, tracks=self.track_count, ppq=self.PPQ) #head.dump() # debug output head.post(outfile) # output the header # # initialize a table of positions for each track, # at the same time - create an event for each track # that sets the name track_pos = [] for i in range(self.track_count): track_pos.append(0) # where we are in each tack... name_ev = Meta_Event() # "generic" name_ev.type = "TRACK NAME" name_ev.event_type = 0x03 # sequence/track name name_ev.data = self.track_list[i].name name_ev.track_num = i name_ev.pos = 0 self.append(name_ev) self.events.sort(key=poskey) # put the events in time order... track_index = 0 for event in self.events: track_index = event.track_num diff = event.pos - track_pos[track_index] if diff < 0: print "Event / pos", event.pos, track_pos[track_index] track = self.track_list[track_index] track.append(MFF.vlq(diff)) # add the delta-time event.emit(track) # add the event... track_pos[track_index]= event.pos print "Track count:", self.track_count for track_num in range(self.track_count): #print "Ending track", track_num self.track_list[track_num].end() #print "Posting track", track_num #self.track_list[track_num].dump() self.track_list[track_num].post(outfile)
def emit(self, track): #print "Emitting Tempo Event", self.t_val, self.track_num, self.pos # self.data = MFF.int2chars(self.t_val, 3) # three byte value... # call the parent class... Meta_Event.emit(self, track)
