Java声音API

JavaSound是Java用于影响和控制声音媒体的类和接口的集合。它由两个包组成。

• javax.sound.sampled：这个包提供了一个用于捕获、混合数字音频的接口。
• javax.sound.midi：这个包为MIDI（乐器数字接口）合成、排序和事件传输提供了一个接口。

什么是MIDI？

我们将在这里探索更多关于 MIDI 的 MIDI。所以 MIDI 就像一张音符表，支持 MIDI 的乐器可以播放，将其视为 HTML 文档，将支持 MIDI 的乐器视为 Web 浏览器。 MIDI 文件包含有关如何播放歌曲的信息，就像吉他手的说明书一样。 MIDI 设备知道如何读取 MIDI 文件并生成声音。

为了发出真实的声音，我们需要四件事：

1. 乐器（播放音乐） SEQUENCER
2. Song（要播放的音乐） SEQUENCE
3. 轨道（保存音符）
4. 音符（实际音乐信息）MIDI EVENTS

JavaSound API 涵盖了所有这些。

SEQUENCER  ⇒  SEQUENCE ⇒ TRACK ⇒ MIDI EVENTS

程序：

第 1 步：获取一个Sequencer并打开它

// Make a sequencer named player and open it
Sequencer player = MIDISystem.getSequencer();
player.open();

第 2 步：创建一个新序列

// Make a new sequence 
Sequence seq = new Sequence(Sequence.PPQ, 4);

第 3 步：从序列中获取新曲目

// Creating new Track
Track t = seq.createTrack();

第 4 步：用MIDIEVENTS填充音轨

// Filling the Track with MidiEvent and
// giving the Secquence to the Sequencer

t.add(myMidiEvent1);
player.setSequence(seq);

// Play it using start
player.start();

执行：

例子

Java

// Java Program to Illustrate JAva Sounf API
  
// Importing classes frpm
// javax.sound package
import javax.sound.midi.*;
  
// Main class
// MiniMusicApp
public class GFG {
  
    // Method 1
    // Main driver method
    public static void main(String[] args)
    {
        // Creating object of class inside main()
        GFG minimusic = new GFG();
  
        // Calling method 2 to play the sound
        minimusic.play();
  
        // Display message on the console for
        // succesful execution of program
        System.out.print(
            "Successfully compiled and executed");
    }
  
    // Method 2
    // To play the sound
    public void play()
    {
  
        // Try block to check for exceptions
        try {
            // Getting a sequencer and open it
            Sequencer player = MidiSystem.getSequencer();
            player.open();
  
            // Making 1a new Sequence
            Sequence seq = new Sequence(Sequence.PPQ, 4);
  
            // Creating a new track
            Track track = seq.createTrack();
  
            // Making a Message
            ShortMessage a = new ShortMessage();
  
            // Put the Instruction in the Message
            a.setMessage(144, 1, 44, 100);
  
            // Make a new MidiEvent
            MidiEvent noteOn = new MidiEvent(a, 1);
  
            // Add MidiEvent to the Track
            track.add(noteOn);
  
            ShortMessage b = new ShortMessage();
            b.setMessage(128, 1, 44, 100);
            MidiEvent noteOff = new MidiEvent(b, 16);
            track.add(noteOff);
  
            // Giving secquence to Sequencer
            player.setSequence(seq);
  
            // Start the Sequencer using start() method
            player.start();
        }
  
        // Catch block to handle exceptions
        catch (Exception ex) {
            // Diusplay the exception on console
            // along with line number
            ex.printStackTrace();
        }
    }
}

输出：

Successfully compiled and executed