我一直在编写一个简短的程序来将音频从线路输入/麦克风重定向到扬声器。我只是在学习其中的大部分内容，但我的工作已经产生了似乎几乎是我想要的工作模型。但是，当我打印TargetDataLine缓冲区时，它会打印全 0，就好像它已连接并流式传输一样，但听不到我的输入。在这一点上，我已经研究了大部分的sampled包内容以及在论坛、教程和其他人的代码中可以在线获得的内容，并且由于令人失望地缺乏已发布的音频代码，我认为我的学习资源几乎已经用完了。因此，如果有人有任何建议或资源，将不胜感激。我认为您不需要任何其他代码，但如果需要，请询问。此代码在我的机器上使用Eclipse version: 4.3.0.v20130605.
这是该类的方法索引，可以为您节省大部分 200 行代码。
class Stream extends Thread {
vars
...
Stream()
setProcessingBuffer()
setRenderingBuffer()
bytesToString()
play()
pause()
run() (Override)
}
代码：
package moshi;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Line;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.Mixer;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.TargetDataLine;
/**
* @author KN
* @version 1.0 Build 1 October 26, 2013
*
* This concurrent process sets up and controls the streaming of audio
* data via input and output buffers.
*
* @see {@link Thread}, {@link AudioSystem}, {@link TargetDataLine},
* {@link SourceDataLine}
*/
public class Stream extends Thread {
/** The {@link AudioFormat} used in encoding/decoding streaming audio data */
public final static AudioFormat audioFormat = new AudioFormat(48000, 16, 2, true, true);
/**
* {@link String} describing the name of the audio device to be used.
* <p>
* Example: "Line In", "Microphone"
*/
private static String INPUT = "Mic";
/**
* {@link String} describing the name of the audio device to be used.
* <p>
* Example: "Speakers", "Line Out"
*/
private static String OUTPUT = "Speakers";
/**
* {@link #PROCESSING_BUFFER} is a buffer used for receiving audio data
*
* @see TargetDataLine
*/
private static TargetDataLine PROCESSING_BUFFER;
/**
* {@link #RENDERING_BUFFER} is a buffer used for writing audio data
*
* @see SourceDataLine
*/
private static SourceDataLine RENDERING_BUFFER;
/** {@link Integer} specifying the buffer sizes in bytes */
private static int BUFFER_SIZE = 2048;
/** {@link Byte[]} for holding raw audio data */
private static byte[] READ_BUFFER = new byte[Stream.BUFFER_SIZE];
/**
* Initiates the audio hardware read/write buffers into
* {@link TargetDataLine}s and {@link SourceDataLine}s respectively.
*
* @see {@link TargetDataLine}, {@link SourceDataLine}
*/
public Stream() {
setProcessingBuffer();
setRenderingBuffer();
}
/**
* Queries input Lines and stores the {@link TargetDataLine} at
* {@link #PROCESSING_BUFFER}
*
* @see {@link AudioSystem}, {@link Line}, {@link TargetDataLine},
* {@link Mixer}
*/
private void setProcessingBuffer() {
final Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
for (final Mixer.Info info : mixerInfos) {
final Mixer mixer = AudioSystem.getMixer(info);
final Line.Info[] targetLineInfos = mixer.getTargetLineInfo();
for (final Line.Info targetLineInfo : targetLineInfos) {
if (targetLineInfo.getLineClass() == javax.sound.sampled.TargetDataLine.class
&& info.getName().startsWith(Stream.INPUT)) {
try {
Stream.PROCESSING_BUFFER = (TargetDataLine) mixer.getLine(targetLineInfo);
System.out.println(targetLineInfo.getLineClass() + ": " + info.getName() + " ["
+ Stream.PROCESSING_BUFFER + "] ");
} catch (LineUnavailableException e) {
e.printStackTrace();
}
} else {
}
}
}
}
/**
* Queries output Lines and stores the {@link SourceDataLine} at
* {@link #RENDERING_BUFFER}
*
* @see {@link AudioSystem}, {@link Line}, {@link SourceDataLine},
* {@link Mixer}
*/
private void setRenderingBuffer() {
final Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
for (Mixer.Info info : mixerInfos) {
final Mixer mixer = AudioSystem.getMixer(info);
final Line.Info[] sourceLineInfos = mixer.getSourceLineInfo();
for (final Line.Info sourceLineInfo : sourceLineInfos) {
if (sourceLineInfo.getLineClass() == javax.sound.sampled.SourceDataLine.class
&& info.getName().startsWith(Stream.OUTPUT)) {
try {
Stream.RENDERING_BUFFER = (SourceDataLine) mixer.getLine(sourceLineInfo);
System.out.println(sourceLineInfo.getLineClass() + ": " + info.getName() + " ["
+ Stream.RENDERING_BUFFER + "]");
} catch (LineUnavailableException e) {
e.printStackTrace();
}
} else {
}
}
}
}
/**
* Takes in an array of bytes and returns a String object representation of
* the data
*
* @param array
* The byte array to be converted
* @return The string object representation of a byte array
*/
private static String bytesToString(byte[] array) {
String toString = "";
for (byte currentByte : array) {
toString += currentByte;
}
return toString;
}
/**
* Opens buffers {@link #PROCESSING_BUFFER} and {@link #RENDERING_BUFFER}
* for reading/writing
*/
public static void play() {
try {
if (!Stream.PROCESSING_BUFFER.isOpen()) {
Stream.PROCESSING_BUFFER.open(Stream.audioFormat, Stream.BUFFER_SIZE);
}
if (!Stream.RENDERING_BUFFER.isOpen()) {
Stream.RENDERING_BUFFER.open(Stream.audioFormat, Stream.BUFFER_SIZE);
Stream.RENDERING_BUFFER.start();
}
while (Stream.RENDERING_BUFFER.isOpen()) {
Stream.PROCESSING_BUFFER.read(Stream.READ_BUFFER, 0, Stream.BUFFER_SIZE);
System.out.println(Stream.bytesToString(Stream.READ_BUFFER));
Stream.RENDERING_BUFFER.write(Stream.READ_BUFFER, 0, Stream.BUFFER_SIZE);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Stops buffers {@link #PROCESSING_BUFFER} and {@link #RENDERING_BUFFER}
* from reading/writing
*/
public static void pause() {
if (Stream.PROCESSING_BUFFER.isOpen()) {
Stream.PROCESSING_BUFFER.close();
}
if (Stream.RENDERING_BUFFER.isOpen()) {
Stream.RENDERING_BUFFER.stop();
Stream.RENDERING_BUFFER.close();
}
}
/** {@inheritDoc} */
@Override
public void run() {
}
}
输出：
interface javax.sound.sampled.TargetDataLine: Microphone (Realtek High Defini [com.sun.media.sound.DirectAudioDevice$DirectTDL@2f57d162]
interface javax.sound.sampled.SourceDataLine: Speakers (Realtek High Definition Audio) [com.sun.media.sound.DirectAudioDevice$DirectSDL@79b7d13e]
0000000000000000000000000000000000000000000000000000000000000...... And a lot more of that