- Java 双重比较
- java - 比较器与 Apache BeanComparator
- Objective-C 完成 block 导致额外的方法调用?
- database - RESTful URI 是否应该公开数据库主键?
我有一个问题与我之前的问题有关。我想从调音台(扬声器)录制音频,我正在使用 javax.sound。我必须设置 audioFormat,但我不知道在那里输入什么:/使用类 ListMixer(我在这里找到 -> http://forums.oracle.com/forums/thread.jspa?threadID=2198477&tstart=2),我写了这样的东西:http://forums.oracle.com/forums/thread.jspa?threadID=2198477&tstart=2但我没有任何关于采样率的信息(未知采样率)。程序抛出此异常:
java.lang.IllegalArgumentException: Line unsupported: interface TargetDataLine supporting format PCM_UNSIGNED 44100.0 Hz, 8 bit, mono, 4 bytes/frame,
代码:
package sound;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.sound.sampled.*;
public class AudioCapture02 extends JFrame{
boolean stopCapture = false;
ByteArrayOutputStream byteArrayOutputStream;
AudioFormat audioFormat;
TargetDataLine targetDataLine;
AudioInputStream audioInputStream;
SourceDataLine sourceDataLine;
public AudioCapture02(){//constructor
final JButton captureBtn =
new JButton("Capture");
final JButton stopBtn = new JButton("Stop");
final JButton playBtn =
new JButton("Playback");
captureBtn.setEnabled(true);
stopBtn.setEnabled(false);
playBtn.setEnabled(false);
//Register anonymous listeners
captureBtn.addActionListener(
new ActionListener(){
public void actionPerformed(
ActionEvent e){
captureBtn.setEnabled(false);
stopBtn.setEnabled(true);
playBtn.setEnabled(false);
//Capture input data from the
// microphone until the Stop button is
// clicked.
captureAudio();
}//end actionPerformed
}//end ActionListener
);//end addActionListener()
getContentPane().add(captureBtn);
stopBtn.addActionListener(
new ActionListener(){
public void actionPerformed(
ActionEvent e){
captureBtn.setEnabled(true);
stopBtn.setEnabled(false);
playBtn.setEnabled(true);
//Terminate the capturing of input data
// from the microphone.
stopCapture = true;
}//end actionPerformed
}//end ActionListener
);//end addActionListener()
getContentPane().add(stopBtn);
playBtn.addActionListener(
new ActionListener(){
public void actionPerformed(
ActionEvent e){
//Play back all of the data that was
// saved during capture.
playAudio();
}//end actionPerformed
}//end ActionListener
);//end addActionListener()
getContentPane().add(playBtn);
getContentPane().setLayout(new FlowLayout());
setTitle("Capture/Playback Demo");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(250,70);
setVisible(true);
}//end constructor
//This method captures audio input from a
// microphone and saves it in a
// ByteArrayOutputStream object.
private void captureAudio(){
try{
//Get and display a list of
// available mixers.
Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
System.out.println("Available mixers:");
for(int cnt = 0; cnt < mixerInfo.length;
cnt++){
System.out.println(mixerInfo[cnt].
getName());
}//end for loop
//Get everything set up for capture
audioFormat = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED, 44100.0F, 8, 1, 4, 44100.0F,
false);
DataLine.Info dataLineInfo =
new DataLine.Info(
TargetDataLine.class,
audioFormat);
ListMixers lm = new ListMixers();
lm.listAll(new PrintWriter(System.out));
System.out.println(" AKTUALNY => "+mixerInfo[0].getName());
Mixer mixer = AudioSystem.getMixer(mixerInfo[0]);
//Get a TargetDataLine on the selected
// mixer.
targetDataLine = (TargetDataLine)
mixer.getLine(dataLineInfo);
//Prepare the line for use.
targetDataLine.open(audioFormat);
targetDataLine.start();
//Create a thread to capture the microphone
// data and start it running. It will run
// until the Stop button is clicked.
Thread captureThread = new CaptureThread();
captureThread.start();
} catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end captureAudio method
//This method plays back the audio data that
// has been saved in the ByteArrayOutputStream
private void playAudio() {
try{
//Get everything set up for playback.
//Get the previously-saved data into a byte
// array object.
byte audioData[] = byteArrayOutputStream.
toByteArray();
//Get an input stream on the byte array
// containing the data
InputStream byteArrayInputStream =
new ByteArrayInputStream(audioData);
AudioFormat audioFormat = getAudioFormat();
audioInputStream = new AudioInputStream(
byteArrayInputStream,
audioFormat,
audioData.length/audioFormat.
getFrameSize());
DataLine.Info dataLineInfo =
new DataLine.Info(
SourceDataLine.class,
audioFormat);
sourceDataLine = (SourceDataLine)
AudioSystem.getLine(dataLineInfo);
sourceDataLine.open(audioFormat);
sourceDataLine.start();
//Create a thread to play back the data and
// start it running. It will run until
// all the data has been played back.
Thread playThread = new PlayThread();
playThread.start();
} catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end playAudio
//This method creates and returns an
// AudioFormat object for a given set of format
// parameters. If these parameters don't work
// well for you, try some of the other
// allowable parameter values, which are shown
// in comments following the declartions.
private AudioFormat getAudioFormat(){
float sampleRate = 8000.0F;
//8000,11025,16000,22050,44100
int sampleSizeInBits = 16;
//8,16
int channels = 1;
//1,2
boolean signed = true;
//true,false
boolean bigEndian = false;
//true,false
return new AudioFormat(
sampleRate,
sampleSizeInBits,
channels,
signed,
bigEndian);
}//end getAudioFormat
//=============================================//
//Inner class to capture data from microphone
class CaptureThread extends Thread{
//An arbitrary-size temporary holding buffer
byte tempBuffer[] = new byte[10000];
public void run(){
byteArrayOutputStream =
new ByteArrayOutputStream();
stopCapture = false;
try{//Loop until stopCapture is set by
// another thread that services the Stop
// button.
while(!stopCapture){
//Read data from the internal buffer of
// the data line.
int cnt = targetDataLine.read(tempBuffer,
0,
tempBuffer.length);
if(cnt > 0){
//Save data in output stream object.
byteArrayOutputStream.write(tempBuffer,
0,
cnt);
}//end if
}//end while
byteArrayOutputStream.close();
}catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end run
}//end inner class CaptureThread
//===================================//
//Inner class to play back the data
// that was saved.
class PlayThread extends Thread{
byte tempBuffer[] = new byte[10000];
public void run(){
try{
int cnt;
//Keep looping until the input read method
// returns -1 for empty stream.
while((cnt = audioInputStream.read(
tempBuffer, 0,
tempBuffer.length)) != -1){
if(cnt > 0){
//Write data to the internal buffer of
// the data line where it will be
// delivered to the speaker.
sourceDataLine.write(tempBuffer,0,cnt);
}//end if
}//end while
//Block and wait for internal buffer of the
// data line to empty.
sourceDataLine.drain();
sourceDataLine.close();
}catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end run
}//end inner class PlayThread
//=============================================//
class ListMixers {
PrintWriter out;
void listAll(final PrintWriter out) {
this.out = out;
Mixer.Info[] aInfos = AudioSystem.getMixerInfo();
for (int i = 0; i < aInfos.length; i++) {
try {
Mixer mixer = AudioSystem.getMixer(aInfos[i]);
out.println(""+i+": "+aInfos[i].getName()+", "
+aInfos[i].getVendor()+", "
+aInfos[i].getVersion()+", "
+aInfos[i].getDescription());
printLines(mixer, mixer.getSourceLineInfo());
printLines(mixer, mixer.getTargetLineInfo());
} catch (Exception e) {
out.println("Exception: "+e);
}
out.println();
}
if (aInfos.length == 0) {
out.println("[No mixers available]");
}
}
void printLines(Mixer mixer, Line.Info[] infos) {
for (int i = 0; i < infos.length; i++) {
try {
if (infos[i] instanceof Port.Info) {
Port.Info info = (Port.Info) infos[i];
out.println(" Port " + info);
}
if (infos[i] instanceof DataLine.Info) {
DataLine.Info info = (DataLine.Info) infos[i];
out.println(" Line " + info + " (max. " +
mixer.getMaxLines(info) + " simultaneously): ");
printFormats(info);
}
Line line = mixer.getLine(infos[i]);
if (!(line instanceof Clip)) {
try {
line.open();
}
catch (LineUnavailableException e) {
out.println("LineUnavailableException when trying to open this line");
}
}
try {
printControls(line.getControls());
}
finally {
if (!(line instanceof Clip)) {
line.close();
}
}
}
catch (Exception e) {
out.println("Exception: " + e);
}
out.println();
}
}
void printFormats(DataLine.Info info) {
AudioFormat[] formats = info.getFormats();
for (int i = 0; i < formats.length; i++) {
out.println(" "+i+": "+formats[i]
+" ("+formats[i].getChannels()+" channels, "
+"frameSize="+formats[i].getFrameSize()+", "
+(formats[i].isBigEndian()?"big endian":"little endian")
+")");
}
if (formats.length == 0) {
out.println(" [no formats]");
}
out.println();
}
void printControls(Control[] controls) {
for (int i = 0; i<controls.length; i++) {
printControl(" ", "Controls["+i+"]: ", controls[i]);
}
if (controls.length == 0) {
out.println(" [no controls]");
}
out.println();
}
void printControl(String indent, String id, Control control) {
if (control instanceof BooleanControl) {
BooleanControl ctrl = (BooleanControl) control;
out.println(indent+id+"BooleanControl: "+ctrl);
} else if (control instanceof CompoundControl) {
CompoundControl ctrl = (CompoundControl) control;
Control[] ctrls = ctrl.getMemberControls();
out.println(indent+id+"CompoundControl: "+control);
for (int i=0; i<ctrls.length; i++) {
printControl(indent+" ", "MemberControls["+i+"]: ", ctrls[i]);
}
} else if (control instanceof EnumControl) {
EnumControl ctrl = (EnumControl) control;
Object[] values = ctrl.getValues();
Object value = ctrl.getValue();
out.println(indent+id+"EnumControl: "+control);
for (int i=0; i<values.length; i++) {
if (values[i] instanceof Control) {
printControl(indent+" ", "Values["+i+"]: "+((values[i]==value)?"*":""), (Control) values[i]);
} else {
out.println(indent+" Values["+i+"]: "+((values[i]==value)?"*":"")+values[i]);
}
}
} else if (control instanceof FloatControl) {
FloatControl ctrl = (FloatControl) control;
out.println(indent+id+"FloatControl: "+ctrl);
} else {
out.println(indent+id+"Control: "+control);
}
}
}
}//end outer class AudioCapture02.java
最佳答案
您将使用您创建的 AudioFormat 获取 TargetDataLine。这不能保证有效。您必须首先使用 AudioSystem.isLineSupported(Info info)
方法查询 Mixer 以检查它是否支持您所需的 AudioFormat。
就我个人而言,我觉得这很麻烦。您需要查询系统上的混音器以确定它们是否支持您想要的 AudioFormat。
下面的函数将为数据线类获取支持格式的 vector 。调用它使用
Vector<AudioFormat> formats = getSupportedFormats(TargetDataLine.class);
或
Vector<AudioFormat> formats = getSupportedFormats(SourceDataLine.class);
此代码可能需要一些调试;我不得不删除一些特定于我的应用程序的东西以使其独立......
public Vector<AudioFormat> getSupportedFormats(Class<?> dataLineClass) {
/*
* These define our criteria when searching for formats supported
* by Mixers on the system.
*/
float sampleRates[] = { (float) 8000.0, (float) 16000.0, (float) 44100.0 };
int channels[] = { 1, 2 };
int bytesPerSample[] = { 2 };
AudioFormat format;
DataLine.Info lineInfo;
SystemAudioProfile profile = new SystemAudioProfile(); // Used for allocating MixerDetails below.
Vector<AudioFormat> formats = new Vector<AudioFormat>();
for (Mixer.Info mixerInfo : AudioSystem.getMixerInfo()) {
for (int a = 0; a < sampleRates.length; a++) {
for (int b = 0; b < channels.length; b++) {
for (int c = 0; c < bytesPerSample.length; c++) {
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
sampleRates[a], 8 * bytesPerSample[c], channels[b], bytesPerSample[c],
sampleRates[a], false);
lineInfo = new DataLine.Info(dataLineClass, format);
if (AudioSystem.isLineSupported(lineInfo)) {
/*
* TODO: To perform an exhaustive search on supported lines, we should open
* TODO: each Mixer and get the supported lines. Do this if this approach
* TODO: doesn't give decent results. For the moment, we just work with whatever
* TODO: the unopened mixers tell us.
*/
if (AudioSystem.getMixer(mixerInfo).isLineSupported(lineInfo)) {
formats.add(format);
}
}
}
}
}
}
return formats;
}
关于Java - 从混音器录制,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6002444/
我正在编写一个具有以下签名的 Java 方法。 void Logger(Method method, Object[] args); 如果一个方法(例如 ABC() )调用此方法 Logger,它应该
我是 Java 新手。 我的问题是我的 Java 程序找不到我试图用作的图像文件一个 JButton。 (目前这段代码什么也没做,因为我只是得到了想要的外观第一的)。这是我的主课 代码: packag
好的,今天我在接受采访,我已经编写 Java 代码多年了。采访中说“Java 垃圾收集是一个棘手的问题,我有几个 friend 一直在努力弄清楚。你在这方面做得怎么样?”。她是想骗我吗?还是我的一生都
我的 friend 给了我一个谜语让我解开。它是这样的: There are 100 people. Each one of them, in his turn, does the following
如果我将使用 Java 5 代码的应用程序编译成字节码,生成的 .class 文件是否能够在 Java 1.4 下运行? 如果后者可以工作并且我正在尝试在我的 Java 1.4 应用程序中使用 Jav
有关于why Java doesn't support unsigned types的问题以及一些关于处理无符号类型的问题。我做了一些搜索,似乎 Scala 也不支持无符号数据类型。限制是Java和S
我只是想知道在一个 java 版本中生成的字节码是否可以在其他 java 版本上运行 最佳答案 通常,字节码无需修改即可在 较新 版本的 Java 上运行。它不会在旧版本上运行,除非您使用特殊参数 (
我有一个关于在命令提示符下执行 java 程序的基本问题。 在某些机器上我们需要指定 -cp 。 (类路径)同时执行java程序 (test为java文件名与.class文件存在于同一目录下) jav
我已经阅读 StackOverflow 有一段时间了,现在我才鼓起勇气提出问题。我今年 20 岁,目前在我的家乡(罗马尼亚克卢日-纳波卡)就读 IT 大学。足以介绍:D。 基本上,我有一家提供簿记应用
我有 public JSONObject parseXML(String xml) { JSONObject jsonObject = XML.toJSONObject(xml); r
我已经在 Java 中实现了带有动态类型的简单解释语言。不幸的是我遇到了以下问题。测试时如下代码: def main() { def ks = Map[[1, 2]].keySet()
一直提示输入 1 到 10 的数字 - 结果应将 st、rd、th 和 nd 添加到数字中。编写一个程序,提示用户输入 1 到 10 之间的任意整数,然后以序数形式显示该整数并附加后缀。 public
我有这个 DownloadFile.java 并按预期下载该文件: import java.io.*; import java.net.URL; public class DownloadFile {
我想在 GUI 上添加延迟。我放置了 2 个 for 循环,然后重新绘制了一个标签,但这 2 个 for 循环一个接一个地执行,并且标签被重新绘制到最后一个。 我能做什么? for(int i=0;
我正在对对象 Student 的列表项进行一些测试,但是我更喜欢在 java 类对象中创建硬编码列表,然后从那里提取数据,而不是连接到数据库并在结果集中选择记录。然而,自从我这样做以来已经很长时间了,
我知道对象创建分为三个部分: 声明 实例化 初始化 classA{} classB extends classA{} classA obj = new classB(1,1); 实例化 它必须使用
我有兴趣使用 GPRS 构建车辆跟踪系统。但是,我有一些问题要问以前做过此操作的人: GPRS 是最好的技术吗?人们意识到任何问题吗? 我计划使用 Java/Java EE - 有更好的技术吗? 如果
我可以通过递归方法反转数组,例如:数组={1,2,3,4,5} 数组结果={5,4,3,2,1}但我的结果是相同的数组,我不知道为什么,请帮助我。 public class Recursion { p
有这样的标准方式吗? 包括 Java源代码-测试代码- Ant 或 Maven联合单元持续集成(可能是巡航控制)ClearCase 版本控制工具部署到应用服务器 最后我希望有一个自动构建和集成环境。
我什至不知道这是否可能,我非常怀疑它是否可能,但如果可以,您能告诉我怎么做吗?我只是想知道如何从打印机打印一些文本。 有什么想法吗? 最佳答案 这里有更简单的事情。 import javax.swin
我是一名优秀的程序员,十分优秀!