本文介绍了在Java中更改卷使用JLayer时的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我使用JLayer从互联网上播放mp3数据的InputStream。我要如何改变输出的音量?
我使用这个code发挥它的:
URL U =新的URL(S);
康涅狄格州的URLConnection = u.openConnection();
conn.setConnectTimeout(Searcher.timeoutms);
conn.setReadTimeout(Searcher.timeoutms);比特流=新的比特流(conn.getInputStream()/ *新的FileInputStream(quick_file)* /);
的System.out.println(比特流);
德codeR =新德codeR();
德coder.setEqualizer(均衡器);
音频= FactoryRegistry.systemRegistry()createAudioDevice()。
audio.open(德codeR);
对(INT I = quick_positions [0];我大于0; I - ){
标题H = bitstream.readFrame();
如果(H == NULL){
返回;
}
bitstream.closeFrame();
解决方案
您可能会认为这是一个不可接受的黑客攻击,但它在MP3播放器,我写的工作。它需要一个小的code除了JLayer类之一。
添加以下方法来javazoom.jl.player.JavaSoundAudioDevice。
公共无效setLineGain(浮点增益)
{
如果(来源!= NULL)
{
FloatControl volControl =(FloatControl)source.getControl(FloatControl.Type.MASTER_GAIN);
浮newGain = Math.min(Math.max(增益,volControl.getMinimum()),volControl.getMaximum()); volControl.setValue(newGain);
}
}
这个新方法则可以让你改变与code这样的音量。
如果(音频的instanceof JavaSoundAudioDevice)
{
JavaSoundAudioDevice jsAudio =(JavaSoundAudioDevice)音频;
jsAudio.setLineGain(yourGainGoesHere);
}
I'm using JLayer to play an inputstream of mp3 data from the internet. How do i change the volume of the output?
I'm using this code to play it:
URL u = new URL(s);
URLConnection conn = u.openConnection();
conn.setConnectTimeout(Searcher.timeoutms);
conn.setReadTimeout(Searcher.timeoutms);
bitstream = new Bitstream(conn.getInputStream()/*new FileInputStream(quick_file)*/);
System.out.println(bitstream);
decoder = new Decoder();
decoder.setEqualizer(equalizer);
audio = FactoryRegistry.systemRegistry().createAudioDevice();
audio.open(decoder);
for(int i = quick_positions[0]; i > 0; i--){
Header h = bitstream.readFrame();
if (h == null){
return;
}
bitstream.closeFrame();
解决方案
You may consider this an unacceptable hack, but it worked in an MP3 player I wrote. It requires a small code addition to one of the JLayer classes.
Add the following method to javazoom.jl.player.JavaSoundAudioDevice.
public void setLineGain(float gain)
{
if (source != null)
{
FloatControl volControl = (FloatControl) source.getControl(FloatControl.Type.MASTER_GAIN);
float newGain = Math.min(Math.max(gain, volControl.getMinimum()), volControl.getMaximum());
volControl.setValue(newGain);
}
}
This new method then allows you to change the volume with code like this.
if (audio instanceof JavaSoundAudioDevice)
{
JavaSoundAudioDevice jsAudio = (JavaSoundAudioDevice) audio;
jsAudio.setLineGain(yourGainGoesHere);
}
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