cutting a wave file

Question

How can i cut a .wave file using java ?

What i want is :

when the user presses the button labeled cut it should cut the audio from the previous mark (in nanoseconds) to the current position in nanoseconds. (mark is positioned to the current position in nanoseconds after the sound is cut) After i get that piece of audio,i want to save that piece of audio file.

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

How can i do that ?

For reference, most .wav files are 44.1KHz, meaning each sample lasts more than 2000ns. You will not get nanosecond accuracy — Kieren Johnstone, Sep 18 '11 at 16:27
What have you done to solve this problem? What research have you made into looking for an existing solution? — Asaf, Sep 18 '11 at 18:48
@ Asaf probably you didn't read the question.You only read the title ! — program-o-steve, Sep 19 '11 at 07:18

score 8 · Accepted Answer · edited May 23 '17 at 11:53

This has originally been answered by Martin Dow

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); }
 }
}

}

Originally answered HERE

score 0 · Answer 2 · answered Sep 18 '11 at 23:51

Create an AudioInputStream from the file source (you can use AudioSystem.getAudioInputStream(File) for this).
Use AudioFormat from the stream's getFormat() to determine the number of bytes you need to read from the stream and the positions.
- File position (bytes) = time(seconds) / sample rate * sample size (bits) * 8 * channels for wave files
Create a new AudioInputStream based on the original that only reads the data you want from the original. You can do this by skipping the bytes you want in the original stream, create a wrapper that fixes the length for the endpoint and then using AudioSystem.getAudioInputStream(AudioFormat, AudioInputStream). There are other ways to do this as well which might be better.
Use AudioSystem.write() method to write out the new file.

You might also want to look at Tritonus and its AudioOutputStream, it might make things easier.

score 0 · Answer 3 · answered Nov 11 '11 at 16:23

0

there's an api which may helps you to achieve your goal http://code.google.com/p/musicg-sound-api/

answered Nov 11 '11 at 16:23

c'quet

345
3
7

this API has no documentation – user482963 Feb 20 '17 at 11:15

cutting a wave file

3 Answers3

Linked