我一直在一个项目中工作,我需要在 java 中操作 MIDI 文件中的每个乐器。然后我决定从序列中的每个轨道中获取每个 MIDI 事件并将其发送到接收器。之后,线程等待每个滴答声持续的时间,然后在下一个滴答声中再次执行此操作。问题是:乐器的声音以及它们的顺序变得非常混乱。我也尝试单独执行每个轨道,但它仍然一团糟!编码:
Sequence sequence = MidiSystem.getSequence(new File(source));
Synthesizer synth = MidiSystem.getSynthesizer();
//Gets a MidiMessage and send it to Synthesizer
Receiver rcv = synth.getReceiver();
//Contains all tracks and events from MIDI file
Track[] tracks = sequence.getTracks();
synth.open();
//If there are tracks
if(tracks != null)
{
//Verify the division type of the sequence (PPQ, SMPT)
if(sequence.getDivisionType() == Sequence.PPQ)
{
int ppq = sequence.getResolution();
//Do the math to get the time (in miliseconds) each tick takes
long tickTime = TicksToMiliseconds(BPM,ppq);
//Returns the number of ticks from the longest track
int longestTrackTicks = LongestTrackTicks(tracks);
//Each iteration sends a new message to 'receiver'
for(int tick = 0; tick < maiorTick ; tick++)
{
//Iteration of each track
for(int trackNumber = 0; trackNumber < tracks.length; trackNumber++)
{
//If the number of ticks from a track isn't already finished
//continue
if(tick < tracks[trackNumber].size())
{
MidiEvent ev = tracks[trackNumber].get(tick);
rcv.send(ev.getMessage(),-1);
}
}
Thread.sleep(tickTime);
}
}
}
synth.close();