问题

我正在尝试在我的Compose for Desktop项目中按下按钮时播放声音。我的MP3文件存储在资源文件夹中（./src/jvmMain/resources/beep.mp3）。

我一直在尝试使用useResource函数，如下所示（在@Composable Button的onClick参数内部）：

scope.launch {
    useResource("beep.mp3") {
        val clip = AudioSystem.getClip()
        val audioInputStream = AudioSystem.getAudioInputStream(it)
        clip.open(audioInputStream)
        clip.start()
    }
}

但我遇到了一个错误：Exception in thread "AWT-EventQueue-0" java.io.IOException: mark/reset not supported。如果我不使用scope，我也会得到相同的错误，我在我的可组合顶层定义如下：

val scope = rememberCoroutineScope()

任何帮助将不胜感激！

scope.launch {
 useResource("beep.mp3") {
                        val clip = AudioSystem.getClip()
                        val audioInputStream = AudioSystem.getAudioInputStream(
                            it
                        )
                        clip.open(audioInputStream)
                        clip.start()
                    }
}

val scope = rememberCoroutineScope()

答案1

得分: 1

需要一个库来解码MP3文件。这是关键。您可以添加以下Maven依赖项：

implementation("com.googlecode.soundlibs:mp3spi:1.9.5.4")

使用最初的Java Sound API，您可以使用以下代码：

import java.io.File;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.AudioSystem.getAudioInputStream;
import javax.sound.sampled.DataLine.Info;
import javax.sound.sampled.SourceDataLine;

class AudioPlayer {
    public void play(String path) {
        File file = new File(path);
        getAudioInputStream(file).use(in -> {
            AudioFormat outFormat = getOutFormat(in.getFormat());
            Info info = new Info(SourceDataLine.class, outFormat);
            AudioSystem.getLine(info).use(line -> {
                if (line instanceof SourceDataLine) {
                    SourceDataLine sourceLine = (SourceDataLine) line;
                    sourceLine.open(outFormat);
                    sourceLine.start();
                    stream(getAudioInputStream(outFormat, in), sourceLine);
                    sourceLine.drain();
                    sourceLine.stop();
                }
            });
        });
    }

    private AudioFormat getOutFormat(AudioFormat inFormat) {
        int ch = inFormat.getChannels();
        float rate = inFormat.getSampleRate();
        return new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, rate, 16, ch, ch * 2, rate, false);
    }

    private void stream(AudioInputStream in, SourceDataLine line) {
        byte[] buffer = new byte[65536];
        int n;
        while ((n = in.read(buffer, 0, buffer.length)) != -1) {
            line.write(buffer, 0, n);
        }
    }
}

然后，从非UI线程/协程调用play方法：

new AudioPlayer().play(fullPathToMP3File);

原始工作由oldo完成，参考链接：https://odoepner.wordpress.com/2013/07/19/play-mp3-or-ogg-using-javax-sound-sampled-mp3spi-vorbisspi/

<details>
<summary>英文:</summary>
A library is needed to decode MP3 files. This is the key. You may add this maven dependency:

implementation("com.googlecode.soundlibs:mp3spi:1.9.5.4")

Using Java Sound APIs you originally used:

import java.io.File
import javax.sound.sampled.AudioFormat
import javax.sound.sampled.AudioInputStream
import javax.sound.sampled.AudioSystem
import javax.sound.sampled.AudioSystem.getAudioInputStream
import javax.sound.sampled.DataLine.Info
import javax.sound.sampled.SourceDataLine

class AudioPlayer {
fun play(path: String) {
val file = File(path)
getAudioInputStream(file).use { in ->
val outFormat = getOutFormat(in.format)
val info = Info(SourceDataLine::class.java, outFormat)
AudioSystem.getLine(info).use { line ->
(line as? SourceDataLine)?.let { l ->
l.open(outFormat)
l.start()
stream(getAudioInputStream(outFormat, in), l)
l.drain()
l.stop()
}
}
}
}

private fun getOutFormat(inFormat: AudioFormat): AudioFormat {
val ch = inFormat.channels
val rate = inFormat.sampleRate
return AudioFormat(AudioFormat.Encoding.PCM_SIGNED, rate, 16, ch, ch * 2, rate, false)
}
private fun stream(`in`: AudioInputStream, line: SourceDataLine) {
val buffer = ByteArray(65536)
var n = 0
while (n != -1) {
line.write(buffer, 0, n)
n = `in`.read(buffer, 0, buffer.size)
}
}

}

And call the `play` method from a non-UI thread / coroutine:

AudioPlayer().play(fullPathToMP3File)

Credit to original work by oldo: https://odoepner.wordpress.com/2013/07/19/play-mp3-or-ogg-using-javax-sound-sampled-mp3spi-vorbisspi/
</details>