问题
I have this simple code to concatenate two wav files. Its pretty simple and the code runs without any errors. But there is a problem with the output file. The output file generated does not play, and surprisingly its size is only 44 bytes whereas my input files "a.wav" & "b.wav" are both more than 500Kb in size.
Here is my code:
import java.io.File;
import java.io.IOException;
import java.io.SequenceInputStream;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
public class WavConcat {
public static void main(String[] args) {
String wFile1 = "./sounds/a.wav";
String wFile2 = "./sounds/b.wav";
try {
AudioInputStream clip1 = AudioSystem.getAudioInputStream(new File(wFile1));
AudioInputStream clip2 = AudioSystem.getAudioInputStream(new File(wFile2));
AudioInputStream appendedFiles =
new AudioInputStream(
new SequenceInputStream(clip1, clip2),
clip1.getFormat(),
clip1.getFrameLength() + clip2.getFrameLength());
AudioSystem.write(appendedFiles,
AudioFileFormat.Type.WAVE,new File("./sounds/ab.wav"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
回答1:
clip1.getFormat()
returns-->
MPEG2L3 24000.0 Hz, unknown bits per sample, mono, unknown frame size, 41.666668 frames/second
clip2.getFormat()
returns-->
MPEG2L3 24000.0 Hz, unknown bits per sample, mono, unknown frame size, 41.666668 frames/second
That is an odd format. I can imagine the 'unknown bits per sample' is causing a problem, but also the MPEG2L3
, since JavaSound has no inbuilt encoder for MP3. It seems like they are not encoded properly. Try loading them in sound editing software and save them as a type of WAV or AU that Java Sound can understand 'out of the box'. Hopefully the editing software:
- Can understand the broken MP3, and..
- Will write a valid WAV or AU.
If you can convert them to 8 bit mono & 8KHz during the conversion, it might reduce the byte[]
size by a factor of 6 to 1. 8KHz is considered good enough to understand speech, and for this use you need to serve the bytes of the combined sound out to the browser - so reducing it in size is crucial.
回答2:
Try this kind of structure. This worked for me
List audioInputStreamList = new ArrayList();
String wFile1 = "./sounds/a.wav";
String wFile2 = "./sounds/b.wav";
AudioInputStream audioInputStream1 = AudioSystem.getAudioInputStream(new File(wFile1));
AudioInputStream audioInputStream2 = AudioSystem.getAudioInputStream(new File(wFile2));
audioInputStreamList.add(audioInputStream1);
audioInputStreamList.add(audioInputStream2);
AudioFormat audioFormat = audioInputStream1.getFormat(); // audioInputStream2 format also same
AudioInputStream udioInputStream = new SequenceAudioInputStream(audioFormat,audioInputStreamList);
AudioSystem.write(audioInputStream, AudioFileFormat.Type.WAVE,new File("./sounds/ab.wav"));
UPDATE
check for SequenceAudioInputStream
来源:https://stackoverflow.com/questions/13381862/concatenation-of-two-wav-files-failed