Question

我已经编写了一些基本代码，用于从外部MIDI键盘录制音符，并将它们按顺序存储在音轨中，保存该序列然后再播放。

代码工作正常，但是在敲击音符与合成器产生音符之间存在一定程度的延迟。我放置了一堆调试代码[忽略您不认识的方法调用，例如Debugging.info（），它们与问题无关]。我还输出了合成器的等待时间值，看起来是120000微秒。那就是我需要以某种方式降低的价值。

有没有办法做到这一点，或者我需要连接到其他外部合成器或减少延迟的东西吗？

我看着Midi device connection and latency无济于事。

代码：

try (
    final Synthesizer synthesizer = MidiSystem.getSynthesizer();
    final Sequencer sequencer = MidiSystem.getSequencer();
    final MidiDevice midiInDevice = MidiSystem.getMidiDevice(MidiSystem.getMidiDeviceInfo()[1])
) {
    synthesizer.open();
    sequencer.open();
    midiInDevice.open();

    Debugging.trace("Synth Latency: " + synthesizer.getLatency());

    midiInDevice.getTransmitter().setReceiver(sequencer.getReceiver());
    midiInDevice.getTransmitter().setReceiver(synthesizer.getReceiver());
    final Receiver receiver = new Receiver() {
        @Override
        public void send(final MidiMessage message, final long timeStamp) {
            Debugging.info("Message [" + timeStamp + "]: " + message);
        }

        @Override
        public void close() {
            Debugging.info("Closing...");
        }
    };
    midiInDevice.getTransmitter().setReceiver(receiver);

    Debugging.trace("MIDI In: " + midiInDevice.getDeviceInfo().getName());

    final Sequence sequence = new Sequence(Sequence.PPQ, 96);
    sequencer.setSequence(sequence);
    final Track track = sequence.createTrack();
    sequencer.setTickPosition(0);
    sequencer.recordEnable(track, 0);
    Debugging.trace("Recording Started");
    sequencer.startRecording();
    Sleeper.sleep(20, TimeUnit.SECONDS);
    sequencer.stopRecording();
    sequencer.recordDisable(track);
    receiver.close();
    Debugging.trace("Recording Stopped");

    MidiUtil.save(new File("/Media/Midi/test.mid"), sequence);

    Sleeper.sleep(1, TimeUnit.SECONDS);
    MidiUtil.allNotesOff(synthesizer);
}

final Sequence loadedSequence = MidiUtil.load(new File("/Media/Midi/test.mid"));
MidiUtil.playSequence(loadedSequence);

从外部Midi设备记录时出现延迟问题

0 个答案: