更新一下SimplePlayer播放mp3的java类!

上次写的时候没有注意CPU使用的问题，结果当按下暂停时，CPU使用达到50%，今天突然发现的，真是的，写程序真的很不小心。

有朋友说MP3Demo运行不起来，不知道这位仁兄是什么问题，在我这是能跑起来。

我这的开发环境为winxp,JCreator 4.5,jdk-6u17-windows-i586;

代码更新For http://download.csdn.net/source/2125539

只更新了一个类 saint.media.SimplePlayer

最新类库http://download.csdn.net/source/2194154

 

/** * @(#)SimplePlayer.java * * * @author Saint(旋幻圣殿) * @version 1.00 2010/3/6 */package saint.media;import java.io.File;import java.io.InputStream;import java.net.URL;import javax.sound.sampled.SourceDataLine;import javax.sound.sampled.AudioFormat;import javax.sound.sampled.AudioInputStream;import javax.sound.sampled.AudioSystem;import javax.sound.sampled.DataLine;import javax.sound.sampled.LineUnavailableException;import javax.sound.sampled.FloatControl;public class SimplePlayer extends BasicPlayer implements Runnable {private Object m_sourcedata;private AudioInputStream m_audioInputStream;private AudioInputStream din;private SourceDataLine m_line;private FloatControl gainControl;private Thread m_thread;private AudioFormat baseFormat,decodedFormat; public SimplePlayer() { super(); } public void play() { if(this.State==STOPPED) { initAudioInputStream(); } if(m_thread!=null) { m_thread.interrupt(); } m_thread = new Thread(this, "BasicPlayer"); m_thread.start(); this.State = PLAYING; this.LoopCnt++; } public void pause() { if(this.State==PLAYING) { m_line.flush(); m_line.stop(); this.State = PAUSED; } } public void resume() { if(this.State==PAUSED) { this.State = PLAYING; } } public void stop() { if(this.State==PLAYING || this.State==PAUSED) { m_line.flush(); m_line.stop(); setLoop(false); setLoopCount(0); this.State = STOPPED; } } public void open(File file) { if( file!=null ) { m_sourcedata = file; initAudioInputStream(); this.State = READIED; } } public void open(URL url) { if( url!=null ) { m_sourcedata = url; initAudioInputStream(); this.State = READIED; } } public void open(InputStream inputStream) { if( inputStream!=null ) { m_sourcedata = inputStream; initAudioInputStream(); this.State = READIED; } } public void initAudioInputStream() { if(m_sourcedata==null) return; this.reset(); try{ if(m_sourcedata instanceof File) { m_audioInputStream = AudioSystem.getAudioInputStream((File) m_sourcedata); }else if(m_sourcedata instanceof URL){ m_audioInputStream = AudioSystem.getAudioInputStream((URL) m_sourcedata); }else if(m_sourcedata instanceof InputStream){ m_audioInputStream = AudioSystem.getAudioInputStream((InputStream) m_sourcedata); } baseFormat = m_audioInputStream.getFormat(); decodedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16, baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false);din = AudioSystem.getAudioInputStream(decodedFormat, m_audioInputStream);m_line = getLine(decodedFormat);gainControl = (FloatControl)m_line.getControl(javax.sound.sampled.FloatControl.Type.MASTER_GAIN);this.setVolume(getVolume()); }catch(Exception ex) { ex.printStackTrace(); } } public void run() { synchronized (m_audioInputStream){ byte[] data = new byte[4096]; if(m_line==null) return; int nBytesRead = 0, nBytesWritten = 0; while(State!=STOPPED) { if(State == PLAYING) { if(!m_line.isRunning()) m_line.start(); try{ nBytesRead = din.read(data, 0, data.length); if (nBytesRead != -1) nBytesWritten = m_line.write(data, 0, nBytesRead); if(nBytesRead==-1) { this.State = STOPPED; break; } }catch(Exception ex) { this.State = STOPPED; ex.printStackTrace(); } }else{ try{ Thread.sleep(300L); }catch(Exception ex) { ex.printStackTrace(); } } } }m_line.drain();m_line.stop();m_line.close();this.needLoop(); } public void setVolume(float value) { if(m_line==null) return; if (gainControl != null) {float db = getVolumeDB(value);gainControl.setValue(db);super.setVolume(value);} } private float getVolumeDB(float volumePercent) {double minDb = gainControl.getMinimum();double maxDb = gainControl.getMaximum();double cste = Math.log(10D) / 20D;double valueDB = minDb + (1.0D / cste) * Math.log(1.0D + (Math.exp(cste * (maxDb * 0.5D - minDb)) - 1.0D) * (double)volumePercent);return (float)valueDB;} private void needLoop() { if(getLoop()) { this.State = STOPPED; if(getLoopCount()==LOOP_CONTINUOUSLY) { this.LoopCnt = 1; this.play(); }else if(this.LoopCnt<getLoopCount()) { this.play(); } } } private void reset() { try{ if(m_audioInputStream!=null) { synchronized (m_audioInputStream){m_audioInputStream.close();} } m_audioInputStream = null; if(din!=null) { synchronized (din){din.close();} } din = null; gainControl = null; baseFormat = null; decodedFormat = null; if(m_line!=null && m_line.isOpen()) { m_line.drain(); m_line.stop(); m_line.close(); m_line = null; } }catch(Exception ex) { ex.printStackTrace(); } } private SourceDataLine getLine(AudioFormat audioFormat) throws LineUnavailableException { SourceDataLine res = null; DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat); res = (SourceDataLine) AudioSystem.getLine(info); res.open(audioFormat); return res;}}