java - 切割一个波形文件

Question

如何使用 java 剪切 .wave 文件？

我想要的是:

当用户按下标记为cut 的按钮时，它应该将音频从之前的mark(以纳秒为单位)剪切到当前位置(以纳秒为单位)。 (标记定位到声音被截断后的当前位置，以纳秒为单位) 得到那段音频后，我想保存那段音频文件。

// obtain an audio stream 
long mark = 0; // initially set to zero
//get the current position in nanoseconds
// after that how to proceed ?
// another method ?

我该怎么做？

Answer 1

这最初由 Martin Dow 回答

import java.io.*;
import javax.sound.sampled.*;

class AudioFileProcessor {

public static void main(String[] args) {
  copyAudio("/tmp/uke.wav", "/tmp/uke-shortened.wav", 2, 1);
}

public static void copyAudio(String sourceFileName, String destinationFileName, int startSecond, int secondsToCopy) {
AudioInputStream inputStream = null;
AudioInputStream shortenedStream = null;
try {
  File file = new File(sourceFileName);
  AudioFileFormat fileFormat = AudioSystem.getAudioFileFormat(file);
  AudioFormat format = fileFormat.getFormat();
  inputStream = AudioSystem.getAudioInputStream(file);
  int bytesPerSecond = format.getFrameSize() * (int)format.getFrameRate();
  inputStream.skip(startSecond * bytesPerSecond);
  long framesOfAudioToCopy = secondsToCopy * (int)format.getFrameRate();
  shortenedStream = new AudioInputStream(inputStream, format, framesOfAudioToCopy);
  File destinationFile = new File(destinationFileName);
  AudioSystem.write(shortenedStream, fileFormat.getType(), destinationFile);
} catch (Exception e) {
  println(e);
} finally {
  if (inputStream != null) try { inputStream.close(); } catch (Exception e) { println(e); }
  if (shortenedStream != null) try { shortenedStream.close(); } catch (Exception e) { println(e); }
 }
}

最初回答 HERE