您能否建议我如何写一个播放歌曲的乐曲？
我尝试了以下 sn-p 但我得到了这个异常：
import sun.audio.*;
import java.io.*;
class tester {
public static void main(String args[]) throws Exception {
InputStream in=new FileInputStream("tester.mp3");
AudioStream as=new AudioStream(in);
AudioPlayer.player.start(as);
}
}
【问题讨论】：
如前所述，Java Sound 默认不支持 MP3。对于它在任何特定 JRE 中支持的类型，请查看 AudioSystem.getAudioFileTypes()。
添加对读取 MP3 的支持的一种方法是将基于 JMF 的 mp3plugin.jar1 添加到应用程序的运行时类路径中。
至于您的实际问题，虽然javax.sound.sampled.Clip 似乎非常适合此类任务，但不幸的是它只能容纳一秒钟的立体声、16 位、44.1KHz 声音。这就是我开发BigClip 的原因。 （它有自己的循环问题，如果你修复它们，请报告。）
package org.pscode.xui.sound.bigclip;
import java.awt.Component;
import javax.swing.*;
// J2SE 1.3
import javax.sound.sampled.*;
import java.io.*;
// J2SE 1.4
import java.util.logging.*;
import java.util.Arrays;
/** An implementation of the javax.sound.sampled.Clip that is designed
to handle Clips of arbitrary size, limited only by the amount of memory
available to the app. It uses the post 1.4 thread behaviour (daemon thread)
that will stop the sound running after the main has exited.
<ul>
<li>2012-07-24 - Fixed bug in size of byte array (2^16 -> (int)Math.pow(2, 16)).
<li>2009-09-01 - Fixed bug that had clip ..clipped at the end, by calling drain() (before
calling stop()) on the dataline after the play loop was complete. Improvement to frame
and microsecond position determination.
<li>2009-08-17 - added convenience constructor that accepts a Clip. Changed the private
convertFrameToM..seconds methods from 'micro' to 'milli' to reflect that they were dealing
with units of 1000/th of a second.
<li>2009-08-14 - got rid of flush() after the sound loop, as it was cutting off tracks just
before the end, and was found to be not needed for the fast-forward/rewind functionality it
was introduced to support.
<li>2009-08-11 - First binary release.
</ul>
N.B. Remove @Override notation and logging to use in 1.3+
@since 1.5
@version 2009-08-17
@author Andrew Thompson */
public class BigClip implements Clip, LineListener {
/** The DataLine used by this Clip. */
private SourceDataLine dataLine;
/** The raw bytes of the audio data. */
private byte[] audioData;
/** The stream wrapper for the audioData. */
private ByteArrayInputStream inputStream;
/** Loop count set by the calling code. */
private int loopCount;
/** Internal count of how many loops to go. */
private int countDown;
/** The start of a loop point. Defaults to 0. */
private int loopPointStart;
/** The end of a loop point. Defaults to the end of the Clip. */
private int loopPointEnd;
/** Stores the current frame position of the clip. */
private int framePosition;
/** Thread used to run() sound. */
private Thread thread;
/** Whether the sound is currently playing or active. */
private boolean active;
/** Stores the last time bytes were dumped to the audio stream. */
private long timelastPositionSet;
private int bufferUpdateFactor = 2;
/** The parent Component for the loading progress dialog. */
Component parent = null;
/** Used for reporting messages. */
private Logger logger = Logger.getAnonymousLogger();
/** Default constructor for a BigClip. Does nothing. Information from the
AudioInputStream passed in open() will be used to get an appropriate SourceDataLine. */
public BigClip() {}
/** There are a number of AudioSystem methods that will return a configured Clip. This
convenience constructor allows us to obtain a SourceDataLine for the BigClip that uses
the same AudioFormat as the original Clip.
@param clip Clip The Clip used to configure the BigClip. */
public BigClip(Clip clip) throws LineUnavailableException {
dataLine = AudioSystem.getSourceDataLine( clip.getFormat() );
}
/** Provides the entire audio buffer of this clip.
@return audioData byte[] The bytes of the audio data that is loaded in this Clip. */
public byte[] getAudioData() {
return audioData;
}
/** Sets a parent component to act as owner of a "Loading track.." progress dialog.
If null, there will be no progress shown. */
public void setParentComponent(Component parent) {
this.parent = parent;
}
/** Converts a frame count to a duration in milliseconds. */
private long convertFramesToMilliseconds(int frames) {
return (frames/(long)dataLine.getFormat().getSampleRate())*1000;
}
/** Converts a duration in milliseconds to a frame count. */
private int convertMillisecondsToFrames(long milliseconds) {
return (int)(milliseconds/dataLine.getFormat().getSampleRate());
}
@Override
public void update(LineEvent le) {
logger.log(Level.FINEST, "update: " + le );
}
@Override
public void loop(int count) {
logger.log(Level.FINEST, "loop(" + count + ") - framePosition: " + framePosition);
loopCount = count;
countDown = count;
active = true;
inputStream.reset();
start();
}
@Override
public void setLoopPoints(int start, int end) {
if (
start<0 ||
start>audioData.length-1 ||
end<0 ||
end>audioData.length
) {
throw new IllegalArgumentException(
"Loop points '" +
start +
"' and '" +
end +
"' cannot be set for buffer of size " +
audioData.length);
}
if (start>end) {
throw new IllegalArgumentException(
"End position " +
end +
" preceeds start position " + start);
}
loopPointStart = start;
framePosition = loopPointStart;
loopPointEnd = end;
}
@Override
public void setMicrosecondPosition(long milliseconds) {
framePosition = convertMillisecondsToFrames(milliseconds);
}
@Override
public long getMicrosecondPosition() {
return convertFramesToMilliseconds(getFramePosition());
}
@Override
public long getMicrosecondLength() {
return convertFramesToMilliseconds(getFrameLength());
}
@Override
public void setFramePosition(int frames) {
framePosition = frames;
int offset = framePosition*format.getFrameSize();
try {
inputStream.reset();
inputStream.read(new byte[offset]);
} catch(Exception e) {
e.printStackTrace();
}
}
@Override
public int getFramePosition() {
long timeSinceLastPositionSet = System.currentTimeMillis() - timelastPositionSet;
int size = dataLine.getBufferSize()*(format.getChannels()/2)/bufferUpdateFactor;
int framesSinceLast = (int)((timeSinceLastPositionSet/1000f)*
dataLine.getFormat().getFrameRate());
int framesRemainingTillTime = size - framesSinceLast;
return framePosition
- framesRemainingTillTime;
}
@Override
public int getFrameLength() {
return audioData.length/format.getFrameSize();
}
AudioFormat format;
@Override
public void open(AudioInputStream stream) throws
IOException,
LineUnavailableException {
AudioInputStream is1;
format = stream.getFormat();
if (format.getEncoding()!=AudioFormat.Encoding.PCM_SIGNED) {
is1 = AudioSystem.getAudioInputStream(
AudioFormat.Encoding.PCM_SIGNED, stream );
} else {
is1 = stream;
}
format = is1.getFormat();
InputStream is2;
if (parent!=null) {
ProgressMonitorInputStream pmis = new ProgressMonitorInputStream(
parent,
"Loading track..",
is1);
pmis.getProgressMonitor().setMillisToPopup(0);
is2 = pmis;
} else {
is2 = is1;
}
byte[] buf = new byte[ (int)Math.pow(2, 16) ];
int totalRead = 0;
int numRead = 0;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
numRead = is2.read( buf );
while (numRead>-1) {
baos.write( buf, 0, numRead );
numRead = is2.read( buf, 0, buf.length );
totalRead += numRead;
}
is2.close();
audioData = baos.toByteArray();
AudioFormat afTemp;
if (format.getChannels()<2) {
afTemp = new AudioFormat(
format.getEncoding(),
format.getSampleRate(),
format.getSampleSizeInBits(),
2,
format.getSampleSizeInBits()*2/8, // calculate frame size
format.getFrameRate(),
format.isBigEndian()
);
} else {
afTemp = format;
}
setLoopPoints(0,audioData.length);
dataLine = AudioSystem.getSourceDataLine(afTemp);
dataLine.open();
inputStream = new ByteArrayInputStream( audioData );
}
@Override
public void open(AudioFormat format,
byte[] data,
int offset,
int bufferSize)
throws LineUnavailableException {
byte[] input = new byte[bufferSize];
for (int ii=0; ii<input.length; ii++) {
input[ii] = data[offset+ii];
}
ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
try {
AudioInputStream ais1 = AudioSystem.getAudioInputStream(inputStream);
AudioInputStream ais2 = AudioSystem.getAudioInputStream(format, ais1);
open(ais2);
} catch( UnsupportedAudioFileException uafe ) {
throw new IllegalArgumentException(uafe);
} catch( IOException ioe ) {
throw new IllegalArgumentException(ioe);
}
// TODO - throw IAE for invalid frame size, format.
}
@Override
public float getLevel() {
return dataLine.getLevel();
}
@Override
public long getLongFramePosition() {
return dataLine.getLongFramePosition()*2/format.getChannels();
}
@Override
public int available() {
return dataLine.available();
}
@Override
public int getBufferSize() {
return dataLine.getBufferSize();
}
@Override
public AudioFormat getFormat() {
return format;
}
@Override
public boolean isActive() {
return dataLine.isActive();
}
@Override
public boolean isRunning() {
return dataLine.isRunning();
}
@Override
public boolean isOpen() {
return dataLine.isOpen();
}
@Override
public void stop() {
logger.log(Level.FINEST, "BigClip.stop()");
active = false;
// why did I have this commented out?
dataLine.stop();
if (thread!=null) {
try {
active = false;
thread.join();
} catch(InterruptedException wakeAndContinue) {
}
}
}
public byte[] convertMonoToStereo(byte[] data, int bytesRead) {
byte[] tempData = new byte[bytesRead*2];
if (format.getSampleSizeInBits()==8) {
for(int ii=0; ii<bytesRead; ii++) {
byte b = data[ii];
tempData[ii*2] = b;
tempData[ii*2+1] = b;
}
} else {
for(int ii=0; ii<bytesRead-1; ii+=2) {
//byte b2 = is2.read();
byte b1 = data[ii];
byte b2 = data[ii+1];
tempData[ii*2] = b1;
tempData[ii*2+1] = b2;
tempData[ii*2+2] = b1;
tempData[ii*2+3] = b2;
}
}
return tempData;
}
boolean fastForward;
boolean fastRewind;
public void setFastForward(boolean fastForward) {
logger.log(Level.FINEST, "FastForward " + fastForward);
this.fastForward = fastForward;
fastRewind = false;
flush();
}
public boolean getFastForward() {
return fastForward;
}
public void setFastRewind(boolean fastRewind) {
logger.log(Level.FINEST, "FastRewind " + fastRewind);
this.fastRewind = fastRewind;
fastForward = false;
flush();
}
public boolean getFastRewind() {
return fastRewind;
}
/** TODO - fix bug in LOOP_CONTINUOUSLY */
@Override
public void start() {
Runnable r = new Runnable() {
public void run() {
try {
/* Should these open()/close() calls be here, or explicitly
called by user program? The JavaDocs for line suggest that
Clip should throw an IllegalArgumentException, so we'll
stick with that and call it explicitly. */
dataLine.open();
dataLine.start();
int bytesRead = 0;
int frameSize = dataLine.getFormat().getFrameSize();
int bufSize = dataLine.getBufferSize();
boolean startOrMove = true;
byte[] data = new byte[bufSize];
int offset = framePosition*frameSize;
int totalBytes = offset;
inputStream.read(new byte[offset], 0, offset);
logger.log(Level.FINEST, "loopCount " + loopCount );
while ((bytesRead = inputStream.read(data,0,data.length))
!= -1 &&
(loopCount==Clip.LOOP_CONTINUOUSLY ||
countDown>0) &&
active ) {
logger.log(Level.FINEST,
"BigClip.start() loop " + framePosition );
totalBytes += bytesRead;
int framesRead;
byte[] tempData;
if (format.getChannels()<2) {
tempData = convertMonoToStereo(data, bytesRead);
framesRead = bytesRead/
format.getFrameSize();
bytesRead*=2;
} else {
framesRead = bytesRead/
dataLine.getFormat().getFrameSize();
tempData = Arrays.copyOfRange(data, 0, bytesRead);
}
framePosition += framesRead;
if (framePosition>=loopPointEnd) {
framePosition = loopPointStart;
inputStream.reset();
countDown--;
logger.log(Level.FINEST,
"Loop Count: " + countDown );
}
timelastPositionSet = System.currentTimeMillis();
byte[] newData;
if (fastForward) {
newData = getEveryNthFrame(tempData, 2);
} else if (fastRewind) {
byte[] temp = getEveryNthFrame(tempData, 2);
newData = reverseFrames(temp);
inputStream.reset();
totalBytes -= 2*bytesRead;
framePosition -= 2*framesRead;
if (totalBytes<0) {
setFastRewind(false);
totalBytes = 0;
}
inputStream.skip(totalBytes);
logger.log(Level.INFO, "totalBytes " + totalBytes);
} else {
newData = tempData;
}
dataLine.write(newData, 0, newData.length);
if (startOrMove) {
data = new byte[bufSize/
bufferUpdateFactor];
startOrMove = false;
}
}
logger.log(Level.FINEST,
"BigClip.start() loop ENDED" + framePosition );
active = false;
dataLine.drain();
dataLine.stop();
/* should these open()/close() be here, or explicitly
called by user program? */
dataLine.close();
} catch (LineUnavailableException lue) {
logger.log( Level.SEVERE,
"No sound line available!", lue );
if (parent!=null) {
JOptionPane.showMessageDialog(
parent,
"Clear the sound lines to proceed",
"No audio lines available!",
JOptionPane.ERROR_MESSAGE);
}
}
}
};
thread= new Thread(r);
// makes thread behaviour compatible with JavaSound post 1.4
thread.setDaemon(true);
thread.start();
}
/** Assume the frame size is 4. */
public byte[] reverseFrames(byte[] data) {
byte[] reversed = new byte[data.length];
byte[] frame = new byte[4];
for (int ii=0; ii<data.length/4; ii++) {
int first = (data.length)-((ii+1)*4)+0;
int last = (data.length)-((ii+1)*4)+3;
frame[0] = data[first];
frame[1] = data[(data.length)-((ii+1)*4)+1];
frame[2] = data[(data.length)-((ii+1)*4)+2];
frame[3] = data[last];
reversed[ii*4+0] = frame[0];
reversed[ii*4+1] = frame[1];
reversed[ii*4+2] = frame[2];
reversed[ii*4+3] = frame[3];
if (ii<5 || ii>(data.length/4)-5) {
logger.log(Level.FINER, "From \t" + first + " \tlast " + last );
logger.log(Level.FINER, "To \t" + ((ii*4)+0) + " \tlast " + ((ii*4)+3) );
}
}
/*
for (int ii=0; ii<data.length; ii++) {
reversed[ii] = data[data.length-1-ii];
}
*/
return reversed;
}
/** Assume the frame size is 4. */
public byte[] getEveryNthFrame(byte[] data, int skip) {
int length = data.length/skip;
length = (length/4)*4;
logger.log(Level.FINEST, "length " + data.length + " \t" + length);
byte[] b = new byte[length];
//byte[] frame = new byte[4];
for (int ii=0; ii<b.length/4; ii++) {
b[ii*4+0] = data[ii*skip*4+0];
b[ii*4+1] = data[ii*skip*4+1];
b[ii*4+2] = data[ii*skip*4+2];
b[ii*4+3] = data[ii*skip*4+3];
}
return b;
}
@Override
public void flush() {
dataLine.flush();
}
@Override
public void drain() {
dataLine.drain();
}
@Override
public void removeLineListener(LineListener listener) {
dataLine.removeLineListener(listener);
}
@Override
public void addLineListener(LineListener listener) {
dataLine.addLineListener(listener);
}
@Override
public Control getControl(Control.Type control) {
return dataLine.getControl(control);
}
@Override
public Control[] getControls() {
if (dataLine==null) {
return new Control[0];
} else {
return dataLine.getControls();
}
}
@Override
public boolean isControlSupported(Control.Type control) {
return dataLine.isControlSupported(control);
}
@Override
public void close() {
dataLine.close();
}
@Override
public void open() throws LineUnavailableException {
throw new IllegalArgumentException("illegal call to open() in interface Clip");
}
@Override
public Line.Info getLineInfo() {
return dataLine.getLineInfo();
}
/** Determines the single largest sample size of all channels of the current clip.
This can be handy for determining a fraction to scal visual representations.
@return Double between 0 & 1 representing the maximum signal level of any channel. */
public double getLargestSampleSize() {
int largest = 0;
int current;
boolean signed = (format.getEncoding()==AudioFormat.Encoding.PCM_SIGNED);
int bitDepth = format.getSampleSizeInBits();
boolean bigEndian = format.isBigEndian();
int samples = audioData.length*8/bitDepth;
if (signed) {
if (bitDepth/8==2) {
if (bigEndian) {
for (int cc = 0; cc < samples; cc++) {
current = (audioData[cc*2]*256 + (audioData[cc*2+1] & 0xFF));
if (Math.abs(current)>largest) {
largest = Math.abs(current);
}
}
} else {
for (int cc = 0; cc < samples; cc++) {
current = (audioData[cc*2+1]*256 + (audioData[cc*2] & 0xFF));
if (Math.abs(current)>largest) {
largest = Math.abs(current);
}
}
}
} else {
for (int cc = 0; cc < samples; cc++) {
current = (audioData[cc] & 0xFF);
if (Math.abs(current)>largest) {
largest = Math.abs(current);
}
}
}
} else {
if (bitDepth/8==2) {
if (bigEndian) {
for (int cc = 0; cc < samples; cc++) {
current = (audioData[cc*2]*256 + (audioData[cc*2+1] - 0x80));
if (Math.abs(current)>largest) {
largest = Math.abs(current);
}
}
} else {
for (int cc = 0; cc < samples; cc++) {
current = (audioData[cc*2+1]*256 + (audioData[cc*2] - 0x80));
if (Math.abs(current)>largest) {
largest = Math.abs(current);
}
}
}
} else {
for (int cc = 0; cc < samples; cc++) {
if ( audioData[cc]>0 ) {
current = (audioData[cc] - 0x80);
if (Math.abs(current)>largest) {
largest = Math.abs(current);
}
} else {
current = (audioData[cc] + 0x80);
if (Math.abs(current)>largest) {
largest = Math.abs(current);
}
}
}
}
}
// audioData
logger.log(Level.FINEST, "Max signal level: " + (double)largest/(Math.pow(2, bitDepth-1)));
return (double)largest/(Math.pow(2, bitDepth-1));
}
}
【讨论】：
play的部分吗@
BigClip 主要基于基于 J2SE 的 Clip。搜索使用Clip 的代码，您应该可以轻松地将其换成BigClip。
MediaPlayer 播放 MP3。
Sun Sound API 不播放 MP3
当我需要它时，我会使用 JavaZOOM jLayer 库 (http://www.javazoom.net/javalayer/javalayer.html)。
为了能够播放 mp3，您仍然需要添加 MP3SPI（由 jLayer 提供）。
【讨论】：
import javazoom.jl.player.Player 时我得到的错误是这个包不存在
我尝试根据我在 BigClip 代码中遇到的错误进行编辑，但被拒绝了。以下代码是我对该程序的修复。请记住，其中一些还未经测试，因为我并不真正关心循环、快进或倒带。
编辑：运行测试和更新代码，因为它不能使用倒带/快进。现在它可以工作了，但还没有测试循环，尽管理论上它应该可以工作。
在此处获取更新的 BigClip 代码：http://pastie.org/4523763
【讨论】：
String file="SOME//SONGFILE//PATH";
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis);
player = new Player(bis);
player.play();
你必须拥有的 jar 文件夹：mp3plugin.jar 和 jlayer.jar (do google)
【讨论】：
使用media.io's online service将文件转换为.wav；然后在你的程序中使用它。
【讨论】：