javax.sound.sampled.LineUnavailableException : The system does not support the specified format

Question

我正在探索录音 API。这在我的本地计算机上运行良好，但是当我在 Heroku 上部署相同的内容时，以下行抛出异常:

 if (!AudioSystem.isLineSupported(info)) {
        throw new LineUnavailableException(
                "The system does not support the specified format.");
 }

文件格式为.wav。是 Heroku 上的声卡不可用还是我错过了其他东西？

这是我尝试在 Heroku 上执行的代码片段:

    format = getAudioFormat();
    DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);

    // checks if system supports the data line
    if (!AudioSystem.isLineSupported(info)) {
        throw new LineUnavailableException(
                "The system does not support the specified format.");
    }

    audioLine = AudioSystem.getTargetDataLine(format);

    audioLine.open(format);
    audioLine.start();

    byte[] buffer = new byte[BUFFER_SIZE];
    int bytesRead = 0;

    recordBytes = new ByteArrayOutputStream();
    isRunning = true;

    while (isRunning) {
        bytesRead = audioLine.read(buffer, 0, buffer.length);
        recordBytes.write(buffer, 0, bytesRead);
    }

谢谢

Answer 1

据我所知 Heroku 不支持声音。为了确定:

Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
for (Mixer.Info[] info : mixerInfos) {
    System.out.println("Supported: " + info);
}
if (mixerInfos.length == 0) {
    System.out.println("Audio mixers are not supported.");
}

来自 getMixerInfo() 的 Javadocs:

Obtains an array of mixer info objects that represents the set of audio mixers that are currently installed on the system.