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我一直在尝试用 Java 制作我的第一个 GUI 音乐播放器。到目前为止,我已经能够使用 Javasound 和 MP3SPI 播放 MP3。现在,我想支持 .m4a 歌曲,而我研究过的最好的库是 JAAD。我下载了它,将它添加到我的项目中,当我尝试播放一首 .m4a 歌曲时它运行良好。添加 JAAD 库后尝试播放 .mp3 时会出现问题。我播放歌曲的代码是:

File file = new File(pathToSong);
AudioInputStream audioStream= AudioSystem.getAudioInputStream(file); // Obtains an audio input stream of the song
    AudioFormat baseFormat = audioStream.getFormat();    //Obtains the audio format of the song in the audio input stream.
    decodedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, //The type of encoding for the audio stream
                    baseFormat.getSampleRate(), //Sample rate of the audio stream
                    16, //Number of bits in each sample of a sound that has this format.
                    baseFormat.getChannels(),   //Number of audio channels in this audio stream
                    baseFormat.getChannels() * 2,   //Number of bytes in each frame of the audiostream
                    baseFormat.getSampleRate(), //Number of frames played or recorded per second, for the sound in the audio stream
                    false); //Data stored in little-endian order

decodedAudioStream = AudioSystem.getAudioInputStream(decodedFormat, audioStream); //Obtains an audio input stream of the indicated encoding by converting the provided audio input stream.

playSong(); //Play the song

(playSong() 只需读取流并将字节写入 SourceDataLine)

添加 JAAD 库后尝试播放 .mp3 时出现的错误如下:

java.io.IOException: Resetting to invalid mark
    at java.io.BufferedInputStream.reset(BufferedInputStream.java:416)
    at net.sourceforge.jaad.spi.javasound.AACAudioFileReader.getAudioInputStream(AACAudioFileReader.java:118)
    at net.sourceforge.jaad.spi.javasound.AACAudioFileReader.getAudioInputStream(AACAudioFileReader.java:143)
    at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1162)
    at Song.run(Song.java:38)

据我了解,Javasound 和 JAAD 的 getAudioInputStream 似乎存在冲突。我该如何解决这个冲突?

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1 回答 1

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好吧,我在这里的答案中找到了一个基于 berry150 的代码一起使用 MP3SPI 和 JAAD 的解决方案:JAAD 阻止其他提供商工作。首先,您必须在类路径中订购 jar,以便在 JAAD 之前加载 JLayer、MP3SPI 和 Tritonous Share。然后要获取 AudioInputStream,请使用以下代码:

if (getAudioFormat().equals(".mp3")) {
    audioStream = AudioSystem.getAudioInputStream(file); // Obtains an audio input stream of the song
            }
else if (getAudioFormat().equals(".m4a")){
    audioStream = new AACAudioFileReader().getAudioInputStream(file);
            }

所以发生的情况是,如果音频是 mp3,来自 Javasound 的 getAudioStreamMethod() 将首先被调用,因为它的 JAR 是首先加载的。如果音频是 .m4a,则创建 ACCAudioFileReader() 的新实例并调用 JAAD 库的 getAudioInputStream()。

于 2013-07-24T18:15:27.293 回答