我在我的音乐播放器项目中遇到了一个与
这是因为
我随后提取了
我经常遇到IllegalArgumentException异常:
JLayer
相关的非常具体的问题。我想添加一些东西来调整音量,但似乎实现起来并不容易。这是因为
JLayer
本身不支持此功能。我从项目中排除了Player
类,并更改了一些方法,对于播放mp3
音乐来说效果很好。为了调整音量,我在Player
类中添加了以下方法:public boolean setGain(float newGain) {
if (audio instanceof JavaSoundAudioDevice) {
System.out.println("InstanceOf");
JavaSoundAudioDevice jsAudio = (JavaSoundAudioDevice) audio;
try {
jsAudio.write(null, 0, 0);
} catch (JavaLayerException ex) {
ex.printStackTrace();
}
return jsAudio.setLineGain(newGain);
}
return false;
}
我随后提取了
JavaSoundAudioDevice
,对其进行反编译并做出更改:public boolean setLineGain(float gain)
{
System.out.println("Vor Source");
if (source != null)
{
System.out.println("Nach Source");
FloatControl volControl = (FloatControl) source.getControl(FloatControl.Type.MASTER_GAIN);
float newGain = Math.min(Math.max(gain, volControl.getMinimum()), volControl.getMaximum());
volControl.setValue(newGain);
return true;
}
return false;
}
同时:
public void createSource() throws JavaLayerException {
Throwable t = null;
try {
Line line = AudioSystem.getLine(getSourceLineInfo());
if (line instanceof SourceDataLine) {
source = (SourceDataLine) line;
//source.open(fmt, millisecondsToBytes(fmt, 2000));
source.open(fmt);
/*
if (source.isControlSupported(FloatControl.Type.MASTER_GAIN))
{
FloatControl c = (FloatControl)source.getControl(FloatControl.Type.MASTER_GAIN);
c.setValue(c.getMaximum());
}*/
source.start();
}
} catch (RuntimeException ex) {
t = ex;
} catch (LinkageError ex) {
t = ex;
} catch (LineUnavailableException ex) {
t = ex;
}
if (source == null) {
throw new JavaLayerException("cannot obtain source audio line", t);
}
}
然而,createSource
方法已经实现,但是却不起作用。出问题的代码在以下这一行:
Line line = AudioSystem.getLine(getSourceLineInfo());
我经常遇到IllegalArgumentException异常:
java.lang.IllegalArgumentException: No line matching interface SourceDataLine supporting format PCM_SIGNED 0.0 Hz, 16 bit, 0 channels, 0 bytes/frame, little-endian is supported.
at javax.sound.sampled.AudioSystem.getLine(AudioSystem.java:479)
at javazoom.jl.player.JavaSoundAudioDevice.createSource(JavaSoundAudioDevice.java:80)
at javazoom.jl.player.JavaSoundAudioDevice.writeImpl(JavaSoundAudioDevice.java:119)
at javazoom.jl.player.AudioDeviceBase.write(Unknown Source)
at MusikPlayer.Erweiterungen.Players.MyPlayer.setGain(MyPlayer.java:192)
at MusikPlayer.PlayerTest.main(PlayerTest.java:21)
Exception in thread "main" java.lang.IllegalArgumentException: No line matching interface SourceDataLine supporting format PCM_SIGNED 0.0 Hz, 16 bit, 0 channels, 0 bytes/frame, little-endian is supported.
at javax.sound.sampled.AudioSystem.getLine(AudioSystem.java:479)
at javazoom.jl.player.JavaSoundAudioDevice.createSource(JavaSoundAudioDevice.java:80)
at javazoom.jl.player.JavaSoundAudioDevice.writeImpl(JavaSoundAudioDevice.java:119)
at javazoom.jl.player.AudioDeviceBase.write(Unknown Source)
at MusikPlayer.Erweiterungen.Players.MyPlayer.decodeFrame(MyPlayer.java:161)
at MusikPlayer.Erweiterungen.Players.MyPlayer.play(MyPlayer.java:87)
at MusikPlayer.Erweiterungen.Players.MyPlayer.play(MyPlayer.java:66)
at MusikPlayer.PlayerTest.main(PlayerTest.java:22)
有人知道为什么会出现这种情况吗?有人知道如何解决这个问题吗?
fmt = new AudioFormat(decoder.getOutputFrequency(), 16, decoder.getOutputChannels(), true, false);
改为new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16, baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false);
我不会得到异常,但是我听不到音频文件中的任何声音,只有刺耳的尖叫声。你有什么关于可以在这里工作的AudioFormat的猜测吗? - Schesam