Java音频处理：从麦克风输入到文件读写与编辑实战

import javax.sound.sampled.*;

public class MicrophoneRecorder {
private static final int SAMPLE_RATE = 44100;
private AudioFormat format;
private TargetDataLine line;

public void startRecording() throws LineUnavailableException {
this.format = new AudioFormat(SAMPLE_RATE, 16, 2, true, false);
DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);

// 获取指定格式的目标数据线（此处即为麦克风采样）
if (!AudioSystem.isLineSupported(info))
throw new IllegalArgumentException("不支持当前声卡！");

this.line = (TargetDataLine) AudioSystem.getLine(info);
line.open(format);

byte[] buffer = new byte[line.getBufferSize()];
line.start();

while (...) { // 持续监听直到停止信号到来
int count = line.read(buffer, 0, buffer.length);
processBuffer(buffer, count); // 对缓冲区中的原始PCM数据进行后续操作
}

stopAndClose();
}

private void processBuffer(byte[] data, int numBytesRead)...

...
}

private File outputFile; // 声明输出文件对象

// 在startRecording内部调用此函数定期存档已录得的部分内容
private synchronized void writeToFile(byte[] audioData, int length) throws IOException{
try(OutputStream outStream = Files.newOutputStream(outputFile.toPath())){
outStream.write(audioData, 0, length);
} catch(IOException e){
System.err.println(e.getMessage());
}
}

...

public void init(File outputFilePath) {... // 初始化时设定outputFile变量...}

public class AudioManager {

private Clip clip;

public boolean loadFromFile(AudioInputStream ais) {
try {
clip = AudioSystem.getClip();
clip.open(ais);
} catch(LineUnavailableException | UnsupportedAudioFileException ex) {
return false;
}
return true;
}

public void applyEffects(...){ /* 实现特定效果的方法 */ }

public void cutSection(Duration fromTime, Duration toTime) {/* 裁切音频片段 */}

... 更多其他编辑/操控方法...
}