Java：Master Gain 不支持异常

发布于 2024-08-13 02:12:40 字数 696 浏览 2 评论 0原文

在 Linux 中，此代码不起作用：我添加了两行

// Added two lines.
DataLine.Info info = new DataLine.Info( SourceDataLine.class, audioFormat );
SourceDataLine dataLine = (SourceDataLine) AudioSystem.getLine( info );
// Adjust the volume on the output line.
if( dataLine.isControlSupported( FloatControl.Type.MASTER_GAIN)) {
    // If inside this if, the Master_Gain must be supported. Yes?
    FloatControl volume = (FloatControl) dataLine.getControl(FloatControl.Type.MASTER_GAIN);
    // This line throws an exception. "Master_Gain not supported"
    volume.setValue( 100.0F );
}

这正常吗？我该怎么做才能解决这个问题？
在 Windows 中它可以工作。

谢谢，Martijn。

原文

In linux this code doesn't work: I added two lines

// Added two lines.
DataLine.Info info = new DataLine.Info( SourceDataLine.class, audioFormat );
SourceDataLine dataLine = (SourceDataLine) AudioSystem.getLine( info );
// Adjust the volume on the output line.
if( dataLine.isControlSupported( FloatControl.Type.MASTER_GAIN)) {
    // If inside this if, the Master_Gain must be supported. Yes?
    FloatControl volume = (FloatControl) dataLine.getControl(FloatControl.Type.MASTER_GAIN);
    // This line throws an exception. "Master_Gain not supported"
    volume.setValue( 100.0F );
}

Is this normal? What do I have to do to solve this?
In windows does it work.

Thanks, Martijn.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

沧笙踏歌 2024-08-20 02:12:40

您可以在尝试使用控件之前尝试 open() 该行吗？像这样的东西：

// Added two lines.
DataLine.Info info = new DataLine.Info( SourceDataLine.class, audioFormat );
SourceDataLine dataLine = (SourceDataLine) AudioSystem.getLine( info );
dataLine.open();
// Adjust the volume on the output line.
if( dataLine.isControlSupported( FloatControl.Type.MASTER_GAIN)) {
    // If inside this if, the Master_Gain must be supported. Yes?
    FloatControl volume = (FloatControl) dataLine.getControl(FloatControl.Type.MASTER_GAIN);
    // This line throws an exception. "Master_Gain not supported"
    volume.setValue( 100.0F );
}

Could you try to open() the line before trying to use controls on it. Something like this:

// Added two lines.
DataLine.Info info = new DataLine.Info( SourceDataLine.class, audioFormat );
SourceDataLine dataLine = (SourceDataLine) AudioSystem.getLine( info );
dataLine.open();
// Adjust the volume on the output line.
if( dataLine.isControlSupported( FloatControl.Type.MASTER_GAIN)) {
    // If inside this if, the Master_Gain must be supported. Yes?
    FloatControl volume = (FloatControl) dataLine.getControl(FloatControl.Type.MASTER_GAIN);
    // This line throws an exception. "Master_Gain not supported"
    volume.setValue( 100.0F );
}

回复收藏 0 原文

吃素的狼 2024-08-20 02:12:40

看起来它根据 JRE 版本而有所不同。

我遇到了类似的问题，当我检查 dataLine.getControls() 时，我在 Oracle JDK 1.7 上得到一个“MASTER_GAIN”控件，在 OpenJDK 1.6 上得到一个“Volume”控件。更糟糕的是……“音量”具有 0...65536 的线性值，而 MASTER_GAIN 似乎具有分贝设置。

代码一次，到处运行就这么多了:-(

回复收藏 0 原文

~没有更多了~