这是您可以使用的帮助程序类。该
getSampleInt()方法是您需要获得振幅的方法：
File file = ...;WavFile wav = new WavFile(file);int amplitudeExample = wav.getSampleInt(140); // 140th amplitude value.for (int i = 0; i < wav.getframesCount(); i++) { int amplitude = wav.getSampleInt(i); // Plot.}它还可以播放文件，以便您可以对其进行测试，但只能播放8位或16位文件。对于其他情况，您只能阅读它们。
另外，请查看这些图以了解WAV文件组成，并更好地了解此类的作用。
public class WaveFile { public final int NOT_SPECIFIED = AudioSystem.NOT_SPECIFIED; // -1 public final int INT_SIZE = 4; private int sampleSize = NOT_SPECIFIED; private long framesCount = NOT_SPECIFIED; private int sampleRate = NOT_SPECIFIED; private int channelsNum; private byte[] data; // wav bytes private AudioInputStream ais; private AudioFormat af; private Clip clip; private boolean canPlay; public WaveFile(File file) throws UnsupportedAudioFileException, IOException { if (!file.exists()) { throw new FileNotFoundException(file.getAbsolutePath()); } ais = AudioSystem.getAudioInputStream(file); af = ais.getFormat(); framesCount = ais.getframeLength(); sampleRate = (int) af.getSampleRate(); sampleSize = af.getSampleSizeInBits() / 8; channelsNum = af.getChannels(); long dataLength = framesCount * af.getSampleSizeInBits() * af.getChannels() / 8; data = new byte[(int) dataLength]; ais.read(data); AudioInputStream aisForPlay = AudioSystem.getAudioInputStream(file); try { clip = AudioSystem.getClip(); clip.open(aisForPlay); clip.setframePosition(0); canPlay = true; } catch (LineUnavailableException e) { canPlay = false; System.out.println("I can play only 8bit and 16bit music."); } } public boolean isCanPlay() { return canPlay; } public void play() { clip.start(); } public void stop() { clip.stop(); } public AudioFormat getAudioFormat() { return af; } public int getSampleSize() { return sampleSize; } public double getDurationTime() { return getframesCount() / getAudioFormat().getframeRate(); } public long getframesCount() { return framesCount; } public int getSampleInt(int sampleNumber) { if (sampleNumber < 0 || sampleNumber >= data.length / sampleSize) { throw new IllegalArgumentException( "sample number can't be < 0 or >= data.length/" + sampleSize); } byte[] sampleBytes = new byte[4]; //4byte = int for (int i = 0; i < sampleSize; i++) { sampleBytes[i] = data[sampleNumber * sampleSize * channelsNum + i]; } int sample = ByteBuffer.wrap(sampleBytes) .order(ByteOrder.LITTLE_ENDIAN).getInt(); return sample; } public int getSampleRate() { return sampleRate; } public Clip getClip() { return clip; }}
