使用Java从Receiver获取Midi消息 [英] Getting midi messages from Receiver in Java

问题描述

我正在尝试使用接收器，以便我可以提取正在播放的midi事件信息.我想听一些演奏的音符并与之同步是一件大事.我已经阅读了文档，但不确定如何实际使用发送器/接收器.如果有人可以帮助我指出如何从接收方获取Midi事件的正确方向，我将不胜感激.

I am trying to use a receiver so that I can extract midi event information as it is playing. I want to listen for notes played and synchronise them was some event. I have read the documentation and I am not sure how to actually use the transmitter / receiver. If someone could help point me in the right direction on how I can grab midi events from the receiver I would be very grateful.

下面提供的可能重复内容无法解释接收器的实际工作方式.它提供了有关实现的源代码，但是作为一个初学者，源代码对于我来说太高级了，无法理解.

The possible duplicate offered below doesn't explain how the receiver actually works. It offers source code on the implementation but as a beginner the source code was too advanced for me to make sense of.

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);
        }
    }

推荐答案

这是侦听所有Midi消息的解决方案.

This was the solution for listening to all midi messages.

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);
    }
}

这是实现接收方的类:

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() {

    }
}

这篇关于使用Java从Receiver获取Midi消息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！