使用Java從Receiver獲取Midi消息

Question

我正在嘗試使用接收器，以便我可以提取正在播放的midi事件信息。 我想聽演奏的音符並與之同步是一件大事。 我已經閱讀了文檔，但不確定如何實際使用發送器/接收器。 如果有人可以幫助我指出如何從接收方獲取Midi事件的正確方向，我將不勝感激。

編輯：下面提供的可能重復內容並未說明接收器的實際工作方式。 它提供了實現的源代碼，但作為一個初學者，源代碼對於我來說太高級了。

import javax.sound.midi.*;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class Main {

    public static Sequencer sequencer;
    public static Sequence sequence;
    public static Receiver synthRcvr;
    public static Transmitter seqTrans;

    public static void main(String[] args) {

        try {
            sequencer = MidiSystem.getSequencer();
            sequence = MidiSystem.getSequence(new File("test.midi"));

            seqTrans = sequencer.getTransmitter();
            synthRcvr = sequencer.getReceiver();
            seqTrans.setReceiver(synthRcvr);

            sequencer.open(); 
            sequencer.setSequence(sequence);

            sequencer.start();
        } catch (IOException | MidiUnavailableException | InvalidMidiDataException e) {
            System.out.println(e);
        }
    }

Answer 1

這是收聽所有Midi消息的解決方案。

import javax.sound.midi.*;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class Main {

public static Receiver synthRcvr = new CustomReceiver();
public static Transmitter seqTrans;
public static Synthesizer synth;

public static void main(String[] args) {

    try {
        sequencer = MidiSystem.getSequencer();
        sequence = MidiSystem.getSequence(new File("test.midi"));

        Sequencer sequencer = MidiSystem.getSequencer();
        seqTrans = sequencer.getTransmitter();
        seqTrans.setReceiver(synthRcvr);

        sequencer.open(); 
        sequencer.setSequence(sequence);

        sequencer.start();
    } catch (IOException | MidiUnavailableException | InvalidMidiDataException e) {
        System.out.println(e);
    }
}

這是實現接收者的類：

import javax.sound.midi.MidiMessage;
import javax.sound.midi.Receiver;

public class CustomReceiver implements Receiver {

    public CustomReceiver() {

    }

    @Override
    public void send(MidiMessage message, long timeStamp) {
        // Process midi messages here
    }

    @Override
    public void close() {

    }
}