java - 无法从输入流中获取音频输入流

Question

我想在代码中提供的 URL 获取声音文件并播放它(它是 mp3 格式)。我查看了一些与此问题相关的 Stack Overflow 问题，他们都说要获取 mp3plugin.jar，所以我做了。

在 Eclipse 中，我将其添加为配置构建路径下的外部 jar(因为它位于我的下载文件夹中，不确定这是否是放置它的最佳位置)。我再次运行它，它仍然给我这个错误:

javax.sound.sampled.UnsupportedAudioFileException: could not get audio input stream from input stream
at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
at Starter.main(Starter.java:21)

代码如下:

public class Starter {

    public static void main(String[] args) {
        AudioInputStream din = null;
        try {
            URL url = new URL("http://c5.rbxcdn.com/2e6d33a5b3b1d8f250c395816ff9f145");
            HttpURLConnection httpcon = (HttpURLConnection) url.openConnection();
            InputStream bufferedIn = new BufferedInputStream(httpcon.getInputStream());
            AudioInputStream in = AudioSystem.getAudioInputStream(bufferedIn);
            AudioFormat baseFormat = in.getFormat();
            AudioFormat decodedFormat = new AudioFormat(
                    AudioFormat.Encoding.PCM_SIGNED,
                    baseFormat.getSampleRate(), 16, baseFormat.getChannels(),
                    baseFormat.getChannels() * 2, baseFormat.getSampleRate(),
                    false);
            din = AudioSystem.getAudioInputStream(decodedFormat, in);
            DataLine.Info info = new DataLine.Info(SourceDataLine.class, decodedFormat);
            SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info);
            if(line != null) {
                line.open(decodedFormat);
                byte[] data = new byte[4096];
                // Start
                line.start();

                int nBytesRead;
                while ((nBytesRead = din.read(data, 0, data.length)) != -1) {
                    line.write(data, 0, nBytesRead);
                }
                // Stop
                line.drain();
                line.stop();
                line.close();
                din.close();
            }

        }
        catch(Exception e) {
            e.printStackTrace();
        }
        finally {
            if(din != null) {
                try { din.close(); } catch(IOException e) { }
            }
        }
    }
}

Answer 1

你需要得到 http://www.javazoom.net/mp3spi/docs/doc1.9.4/javazoom/spi/mpeg/sampled/file/MpegAudioFileReader.html

下载 jar 。我的类路径为

.;C:\Vision\Audio\libs\vorbisspi1.0.3.jar;C:\Vision\Audio\libs\tritonus_share.jar;C:\Vision\Audio\libs\tritonus_remaining-0.3.6.jar;C:\Vision\Audio\libs\jorbis-0.0.15.jar;C:\Vision\Audio\libs\jogg-0.0.7.jar;C:\Vision\Audio\libs\jl1.0.jar;C:\Vision\Audio\libs\mp3spi1.9.4.jar;

您可能只需要 mp3spi1.9.4.jar - 其中一些用于其他格式，但我不确定，所以我将它们全部包含在内。

然后有如下程序

public AudioInputStream readMP3URL(String f) {
    AudioInputStream audioInputStream = null;
    AudioFormat targetFormat = null;
    try {
        AudioInputStream in = null;
        MpegAudioFileReader mp = new MpegAudioFileReader();
        in = mp.getAudioInputStream(new URL(f));
        AudioFormat baseFormat = in.getFormat();
        targetFormat = new AudioFormat(
                AudioFormat.Encoding.PCM_SIGNED,
                baseFormat.getSampleRate(),
                16,
                baseFormat.getChannels(),
                baseFormat.getChannels() * 2,
                baseFormat.getSampleRate(),
                false);
        audioInputStream = AudioSystem.getAudioInputStream(targetFormat, in);
    }
    catch (Exception ue) {
        System.out.println("\nUnsupported Audio");
    }
    return audioInputStream;
}

public void readURL() {
    int i, j, k = 0, l, basicU = 1024;
    AudioFormat targetFormat = null;
    audioInputStream = readMP3URL("http://c5.rbxcdn.com/2e6d33a5b3b1d8f250c395816ff9f145");
    if (audioInputStream == null) System.out.println("null audiostream");
    targetFormat = audioInputStream.getFormat();
    byte[] data = new byte[basicU];
    DataLine.Info dinfo = new DataLine.Info(SourceDataLine.class, targetFormat);
    SourceDataLine line = null;
    try {
        line = (SourceDataLine) AudioSystem.getLine(dinfo);
        if (line != null) {
            line.open(targetFormat);
            line.start();
            while ((k = audioInputStream.read(data, 0, data.length)) != -1) {
                line.write(data, 0, k);
            }
            line.stop();
            line.close();
        }
    }
    catch (Exception ex) {
        ex.printStackTrace();
        System.out.println("audio problem " + ex);
    }
}