工具类

import lombok.extern.slf4j.Slf4j;import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;@Slf4j
public class WavUtils {public static double getDecibels(String url) {try {AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(URI.create(url).toURL());return doCal(audioInputStream);} catch (UnsupportedAudioFileException | IOException e) {return Double.MAX_VALUE;}}public static double getDecibels(InputStream inputStream) {try (BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream)) {AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(bufferedInputStream);return doCal(audioInputStream);} catch (IOException | UnsupportedAudioFileException e) {return Double.MAX_VALUE;}}private static double doCal(AudioInputStream audioInputStream) throws IOException {AudioFormat audioFormat = audioInputStream.getFormat();if (audioFormat.getEncoding() != AudioFormat.Encoding.PCM_SIGNED) {audioFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,audioFormat.getSampleRate(),audioFormat.getSampleSizeInBits() * 2,audioFormat.getChannels(),audioFormat.getFrameSize() * 2,audioFormat.getFrameRate(),true);audioInputStream = AudioSystem.getAudioInputStream(audioFormat, audioInputStream);}byte[] buffer = new byte[4096];int bytesRead;double sum = 0;int count = 0;while ((bytesRead = audioInputStream.read(buffer)) != -1) {for (int i = 0; i < bytesRead; i += 2) {// 将字节数据转换为 16 位有符号整数short sample = (short) ((buffer[i + 1] << 8) | buffer[i]);// 计算样本的振幅double amplitude = sample / 32768.0;// 计算振幅的平方并累加sum += amplitude * amplitude;count++;}}double rms = Math.sqrt(sum / count);double decibels = 20 * Math.log10(rms);decibels = Math.abs(decibels);log.info("decibels: {}", decibels);return decibels;}
}

测试类

@Testpublic void testDb() {try (FileInputStream stream = new FileInputStream("/path/to/file")) {double decibels = WavUtils.getDecibels(stream);} catch (Exception e) {}double decibels = WavUtils.getDecibels("url");}