Java的声音API不适用于所有.WAV文件？ [英] Java's sound API doesn't work with all .WAV files?

问题描述

我目前无法使用 javax.sound.sampled 库来解决问题。以下是用于播放音频文件的 MCV 代码：

  import javax.sound.sampled。*; 
 import java.io.File; 
 
 public class Foo 
 {
 public static void main（String [] args）
 {
 try 
 {
 File f = new File（alarm.wav）;音频输入
剪辑剪辑= AudioSystem.getClip（）; 
 
 clip.open（ais）; 
 clip.start（）; 
} 
 catch（异常e）{} 
} 
} 
  

此代码有时会抛出 UnsupportedAudioFileException 。

基本上，我有5个.WAV文件，我知道是没有坏的，因为当我在我的音乐播放软件中打开它们时，它们玩得很好。但是，Java程序只适用于其中的3个。

Oracle在这里提到对此文件格式的支持如何确保我的所有.WAV文件与Java的音频API兼容？如果由于某些原因他们没有适当的编码，是否有一个万无一失的玩WAV文件？

解决方案

您可以使用以下代码获取支持的播放格式列表：

  static List< AudioFormat> getSupportedAudioFormats（）{
列表< AudioFormat> result = new ArrayList< AudioFormat>（）; 
 for（Line.Info info：AudioSystem.getSourceLineInfo（
 new Line.Info（SourceDataLine.class）））{
 if（info instanceof SourceDataLine.Info）{
 result。 addAll（Arrays.asList（
（（SourceDataLine.Info）info）.getFormats（）））; 
} 
} 
返回结果; 
} 
  

AudioFormat.Encoding 列出了支持的编码 javax.sound.sampled 。

安全的WAV音频格式是44100Hz的16位PCM。 >

您可以通过以下方式发现特定文件的格式：

 文件文件=新文件（path_to_file.wav）; 
 AudioFormat fmt = AudioSystem.getAudioFileFormat（file）.getFormat（）; 
  

这比尝试获取一行更宽松一些，但仍然会抛出如果WAV文件有例如mp3数据。 WAV文件是一个可以存储PCM以外的编码的容器，其中一些 javax.sound.sampled 通常不支持。

I am currently having trouble playing around with the javax.sound.sampled library. Here's the MCV code that I use to play my audio files:

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

public class Foo
{
    public static void main(String[] args)
    {
        try
        {
            File f = new File("alarm.wav");
            AudioInputStream ais = AudioSystem.getAudioInputStream(f);
            Clip clip = AudioSystem.getClip();

            clip.open(ais);
            clip.start();
        }
        catch (Exception e) {}
    }
}

This code will sometimes throw an UnsupportedAudioFileException.

Basically, I have 5 .WAV files that I know are uncorrupted because they play perfectly fine when I open them in my music playing software. However, the Java program only works with 3 of them.

Oracle mentions support for this file format here. How can I make sure that all of my .WAV files are compatible with Java's audio API? Is there a foolproof way of playing .WAV files if for some reason they do not have the appropriate encoding?

解决方案

You can use the following code to get a list of the supported formats for playback:

static List<AudioFormat> getSupportedAudioFormats() {
    List<AudioFormat> result = new ArrayList<AudioFormat>();
    for(Line.Info info : AudioSystem.getSourceLineInfo(
            new Line.Info(SourceDataLine.class))) {
        if(info instanceof SourceDataLine.Info) {
            result.addAll(Arrays.asList(
                ((SourceDataLine.Info)info).getFormats()));
        }
    }
    return result;
}

AudioFormat.Encoding lists the encodings supported by javax.sound.sampled.

A safe WAV audio format is 16-bit PCM at 44100Hz.

You can discover the format of a particular file with:

File file = new File("path_to_file.wav");
AudioFormat fmt = AudioSystem.getAudioFileFormat(file).getFormat();

This will be a little more lenient than trying to get a line for example, but it will still throw if the WAV file has e.g. mp3 data. A WAV file is a container that can store encodings beyond PCM, some of which javax.sound.sampled does not normally support.

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