java - 在 Java 中从 Receiver 获取 midi 消息

Question

我正在尝试使用接收器，以便在播放时提取 MIDI 事件信息。我想听演奏的音符并同步它们是一些事件。我已阅读文档，但不确定如何实际使用发射器/接收器。如果有人可以帮助我指明如何从接收器中获取 midi 事件的正确方向，我将非常感激。

编辑:下面提供的可能的重复内容并不能解释接收器的实际工作原理。它提供了有关实现的源代码，但作为初学者，源代码对我来说太高级了，无法理解。

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

这是收听所有 MIDI 消息的解决方案。

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);
    }
}

这是实现接收器的类:

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() {

    }
}