如何同时播放多个（音频）字节数组？这个＆＃34;字节数组＆＃34;由TargetDataLine记录，使用服务器传输。
到目前为止我尝试了什么
使用SourceDataLine：
无法使用SourceDataLine播放多个流，因为write方法会一直阻塞，直到写入缓冲区。使用Threads无法修复此问题，因为只有一个SourceDataLine可以同时写入。
使用AudioPlayer类：
ByteInputStream stream2 = new ByteInputStream(data, 0, data.length);
AudioInputStream stream = new AudioInputStream(stream2, VoiceChat.format, data.length);
AudioPlayer.player.start(stream);
这只会对客户产生噪音。
EDIT 我不会同时收到语音数据包，不会同时收到语音数据包，更多地重复＃34;
答案 0 :(得分：4)
显然，Java的Mixer接口不是为此而设计的。
http://docs.oracle.com/javase/7/docs/api/javax/sound/sampled/Mixer.html：
调音台是具有一条或多条线路的音频设备。它不一定是 设计用于混合音频信号。
事实上，当我尝试在同一个调音台上打开多行时，这会失败并显示LineUnavailableException。但是，如果您的所有录音都具有相同的音频格式，则可以很容易地将它们手动混合在一起。例如，如果您有2个输入：
byte[]，16位为short[]，32位浮点为float[]等。SourceDataLine 另见How is audio represented with numbers?
这是一个混合2个录音并输出为1个信号的示例，全部采用16位48Khz立体声。
// print all devices (both input and output)
int i = 0;
Mixer.Info[] infos = AudioSystem.getMixerInfo();
for (Mixer.Info info : infos)
System.out.println(i++ + ": " + info.getName());
// select 2 inputs and 1 output
System.out.println("Select input 1: ");
int in1Index = Integer.parseInt(System.console().readLine());
System.out.println("Select input 2: ");
int in2Index = Integer.parseInt(System.console().readLine());
System.out.println("Select output: ");
int outIndex = Integer.parseInt(System.console().readLine());
// ugly java sound api stuff
try (Mixer in1Mixer = AudioSystem.getMixer(infos[in1Index]);
Mixer in2Mixer = AudioSystem.getMixer(infos[in2Index]);
Mixer outMixer = AudioSystem.getMixer(infos[outIndex])) {
in1Mixer.open();
in2Mixer.open();
outMixer.open();
try (TargetDataLine in1Line = (TargetDataLine) in1Mixer.getLine(in1Mixer.getTargetLineInfo()[0]);
TargetDataLine in2Line = (TargetDataLine) in2Mixer.getLine(in2Mixer.getTargetLineInfo()[0]);
SourceDataLine outLine = (SourceDataLine) outMixer.getLine(outMixer.getSourceLineInfo()[0])) {
// audio format 48khz 16 bit stereo (signed litte endian)
AudioFormat format = new AudioFormat(48000.0f, 16, 2, true, false);
// 4 bytes per frame (16 bit samples stereo)
int frameSize = 4;
int bufferSize = 4800;
int bufferBytes = frameSize * bufferSize;
// buffers for java audio
byte[] in1Bytes = new byte[bufferBytes];
byte[] in2Bytes = new byte[bufferBytes];
byte[] outBytes = new byte[bufferBytes];
// buffers for mixing
short[] in1Samples = new short[bufferBytes / 2];
short[] in2Samples = new short[bufferBytes / 2];
short[] outSamples = new short[bufferBytes / 2];
// how long to record & play
int framesProcessed = 0;
int durationSeconds = 10;
int durationFrames = (int) (durationSeconds * format.getSampleRate());
// open devices
in1Line.open(format, bufferBytes);
in2Line.open(format, bufferBytes);
outLine.open(format, bufferBytes);
in1Line.start();
in2Line.start();
outLine.start();
// start audio loop
while (framesProcessed < durationFrames) {
// record audio
in1Line.read(in1Bytes, 0, bufferBytes);
in2Line.read(in2Bytes, 0, bufferBytes);
// convert input bytes to samples
ByteBuffer.wrap(in1Bytes).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(in1Samples);
ByteBuffer.wrap(in2Bytes).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(in2Samples);
// mix samples - lower volume by 50% since we're mixing 2 streams
for (int s = 0; s < bufferBytes / 2; s++)
outSamples[s] = (short) ((in1Samples[s] + in2Samples[s]) * 0.5);
// convert output samples to bytes
ByteBuffer.wrap(outBytes).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().put(outSamples);
// play audio
outLine.write(outBytes, 0, bufferBytes);
framesProcessed += bufferBytes / frameSize;
}
in1Line.stop();
in2Line.stop();
outLine.stop();
}
}
答案 1 :(得分：2)
好吧，我把一些东西放在一起，这应该可以让你开始。我将在下面发布完整的代码，但我将首先尝试解释所涉及的步骤。
这里有趣的部分是创建你自己的音频＆＃34;混音器＆＃34;允许该类消费者在（近）未来的特定点安排音频块的类。具体的时间点部分在这里很重要：我假设您在数据包中接收网络语音，其中每个数据包需要准确地从前一个数据包的末尾开始，以便为单个数据播放连续的声音语音。此外，因为你说声音可以重叠我假设（是的，很多假设）新的一个可以通过网络进入，而一个或多个旧的仍在播放。因此，允许从任何线程调度音频块似乎是合理的。请注意，只有一个线程实际写入数据线，只是任何线程都可以将音频数据包提交给调音台。
因此，对于submit-audio-packet部分，我们现在有了这个：
private final ConcurrentLinkedQueue<QueuedBlock> scheduledBlocks;
public void mix(long when, short[] block) {
scheduledBlocks.add(new QueuedBlock(when, Arrays.copyOf(block, block.length)));
}
QueuedBlock类仅用于标记字节数组（音频缓冲区）和＆＃34;当＆＃34;：应该播放该块的时间点。
时间点相对于音频流的当前位置表示。每次将音频缓冲区写入数据线时，在创建流时将其设置为零并使用缓冲区大小进行更新：
private final AtomicLong position = new AtomicLong();
public long position() {
return position.get();
}
除了设置数据线的所有麻烦之外，混音器类的有趣部分显然是混音发生的地方。对于每个预定的音频块，它分为3种情况：
另请注意，没有可靠的方法可以立即开始播放音频数据，当您将数据包提交到调音台时，请务必始终让它们从现在开始至少持续1个音频缓冲区，否则您需要这样做。将失去声音开始的风险。这是混音代码：
private static final double MIXDOWN_VOLUME = 1.0 / NUM_PRODUCERS;
private final List<QueuedBlock> finished = new ArrayList<>();
private final short[] mixBuffer = new short[BUFFER_SIZE_FRAMES * CHANNELS];
private final byte[] audioBuffer = new byte[BUFFER_SIZE_FRAMES * CHANNELS * 2];
private final AtomicLong position = new AtomicLong();
Arrays.fill(mixBuffer, (short) 0);
long bufferStartAt = position.get();
for (QueuedBlock block : scheduledBlocks) {
int blockFrames = block.data.length / CHANNELS;
// block fully played - mark for deletion
if (block.when + blockFrames <= bufferStartAt) {
finished.add(block);
continue;
}
// block starts after end of current buffer
if (bufferStartAt + BUFFER_SIZE_FRAMES <= block.when)
continue;
// mix in part of the block which overlaps current buffer
int blockOffset = Math.max(0, (int) (bufferStartAt - block.when));
int blockMaxFrames = blockFrames - blockOffset;
int bufferOffset = Math.max(0, (int) (block.when - bufferStartAt));
int bufferMaxFrames = BUFFER_SIZE_FRAMES - bufferOffset;
for (int f = 0; f < blockMaxFrames && f < bufferMaxFrames; f++)
for (int c = 0; c < CHANNELS; c++) {
int bufferIndex = (bufferOffset + f) * CHANNELS + c;
int blockIndex = (blockOffset + f) * CHANNELS + c;
mixBuffer[bufferIndex] += (short)
(block.data[blockIndex]*MIXDOWN_VOLUME);
}
}
scheduledBlocks.removeAll(finished);
finished.clear();
ByteBuffer
.wrap(audioBuffer)
.order(ByteOrder.LITTLE_ENDIAN)
.asShortBuffer()
.put(mixBuffer);
line.write(audioBuffer, 0, audioBuffer.length);
position.addAndGet(BUFFER_SIZE_FRAMES);
最后是一个完整的，自包含的样本，它产生了许多线程，提交代表随机持续时间和频率的正弦波的音频块到混音器（在此示例中称为AudioConsumer）。通过传入的网络数据包替换正弦波，您应该已经解决了一半。
package test;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Line;
import javax.sound.sampled.Mixer;
import javax.sound.sampled.SourceDataLine;
public class Test {
public static final int CHANNELS = 2;
public static final int SAMPLE_RATE = 48000;
public static final int NUM_PRODUCERS = 10;
public static final int BUFFER_SIZE_FRAMES = 4800;
// generates some random sine wave
public static class ToneGenerator {
private static final double[] NOTES = {261.63, 311.13, 392.00};
private static final double[] OCTAVES = {1.0, 2.0, 4.0, 8.0};
private static final double[] LENGTHS = {0.05, 0.25, 1.0, 2.5, 5.0};
private double phase;
private int framesProcessed;
private final double length;
private final double frequency;
public ToneGenerator() {
ThreadLocalRandom rand = ThreadLocalRandom.current();
length = LENGTHS[rand.nextInt(LENGTHS.length)];
frequency = NOTES[rand.nextInt(NOTES.length)] * OCTAVES[rand.nextInt(OCTAVES.length)];
}
// make sound
public void fill(short[] block) {
for (int f = 0; f < block.length / CHANNELS; f++) {
double sample = Math.sin(phase * 2.0 * Math.PI);
for (int c = 0; c < CHANNELS; c++)
block[f * CHANNELS + c] = (short) (sample * Short.MAX_VALUE);
phase += frequency / SAMPLE_RATE;
}
framesProcessed += block.length / CHANNELS;
}
// true if length of tone has been generated
public boolean done() {
return framesProcessed >= length * SAMPLE_RATE;
}
}
// dummy audio producer, based on sinewave generator
// above but could also be incoming network packets
public static class AudioProducer {
final Thread thread;
final AudioConsumer consumer;
final short[] buffer = new short[BUFFER_SIZE_FRAMES * CHANNELS];
public AudioProducer(AudioConsumer consumer) {
this.consumer = consumer;
thread = new Thread(() -> run());
thread.setDaemon(true);
}
public void start() {
thread.start();
}
// repeatedly play random sine and sleep for some time
void run() {
try {
ThreadLocalRandom rand = ThreadLocalRandom.current();
while (true) {
long pos = consumer.position();
ToneGenerator g = new ToneGenerator();
// if we schedule at current buffer position, first part of the tone will be
// missed so have tone start somewhere in the middle of the next buffer
pos += BUFFER_SIZE_FRAMES + rand.nextInt(BUFFER_SIZE_FRAMES);
while (!g.done()) {
g.fill(buffer);
consumer.mix(pos, buffer);
pos += BUFFER_SIZE_FRAMES;
// we can generate audio faster than it's played
// sleep a while to compensate - this more closely
// corresponds to playing audio coming in over the network
double bufferLengthMillis = BUFFER_SIZE_FRAMES * 1000.0 / SAMPLE_RATE;
Thread.sleep((int) (bufferLengthMillis * 0.9));
}
// sleep a while in between tones
Thread.sleep(1000 + rand.nextInt(2000));
}
} catch (Throwable t) {
System.out.println(t.getMessage());
t.printStackTrace();
}
}
}
// audio consumer - plays continuously on a background
// thread, allows audio to be mixed in from arbitrary threads
public static class AudioConsumer {
// audio block with "when to play" tag
private static class QueuedBlock {
final long when;
final short[] data;
public QueuedBlock(long when, short[] data) {
this.when = when;
this.data = data;
}
}
// need not normally be so low but in this example
// we're mixing down a bunch of full scale sinewaves
private static final double MIXDOWN_VOLUME = 1.0 / NUM_PRODUCERS;
private final List<QueuedBlock> finished = new ArrayList<>();
private final short[] mixBuffer = new short[BUFFER_SIZE_FRAMES * CHANNELS];
private final byte[] audioBuffer = new byte[BUFFER_SIZE_FRAMES * CHANNELS * 2];
private final Thread thread;
private final AtomicLong position = new AtomicLong();
private final AtomicBoolean running = new AtomicBoolean(true);
private final ConcurrentLinkedQueue<QueuedBlock> scheduledBlocks = new ConcurrentLinkedQueue<>();
public AudioConsumer() {
thread = new Thread(() -> run());
}
public void start() {
thread.start();
}
public void stop() {
running.set(false);
}
// gets the play cursor. note - this is not accurate and
// must only be used to schedule blocks relative to other blocks
// (e.g., for splitting up continuous sounds into multiple blocks)
public long position() {
return position.get();
}
// put copy of audio block into queue so we don't
// have to worry about caller messing with it afterwards
public void mix(long when, short[] block) {
scheduledBlocks.add(new QueuedBlock(when, Arrays.copyOf(block, block.length)));
}
// better hope mixer 0, line 0 is output
private void run() {
Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
try (Mixer mixer = AudioSystem.getMixer(mixerInfo[0])) {
Line.Info[] lineInfo = mixer.getSourceLineInfo();
try (SourceDataLine line = (SourceDataLine) mixer.getLine(lineInfo[0])) {
line.open(new AudioFormat(SAMPLE_RATE, 16, CHANNELS, true, false), BUFFER_SIZE_FRAMES);
line.start();
while (running.get())
processSingleBuffer(line);
line.stop();
}
} catch (Throwable t) {
System.out.println(t.getMessage());
t.printStackTrace();
}
}
// mix down single buffer and offer to the audio device
private void processSingleBuffer(SourceDataLine line) {
Arrays.fill(mixBuffer, (short) 0);
long bufferStartAt = position.get();
// mixdown audio blocks
for (QueuedBlock block : scheduledBlocks) {
int blockFrames = block.data.length / CHANNELS;
// block fully played - mark for deletion
if (block.when + blockFrames <= bufferStartAt) {
finished.add(block);
continue;
}
// block starts after end of current buffer
if (bufferStartAt + BUFFER_SIZE_FRAMES <= block.when)
continue;
// mix in part of the block which overlaps current buffer
// note that block may have already started in the past
// but extends into the current buffer, or that it starts
// in the future but before the end of the current buffer
int blockOffset = Math.max(0, (int) (bufferStartAt - block.when));
int blockMaxFrames = blockFrames - blockOffset;
int bufferOffset = Math.max(0, (int) (block.when - bufferStartAt));
int bufferMaxFrames = BUFFER_SIZE_FRAMES - bufferOffset;
for (int f = 0; f < blockMaxFrames && f < bufferMaxFrames; f++)
for (int c = 0; c < CHANNELS; c++) {
int bufferIndex = (bufferOffset + f) * CHANNELS + c;
int blockIndex = (blockOffset + f) * CHANNELS + c;
mixBuffer[bufferIndex] += (short) (block.data[blockIndex] * MIXDOWN_VOLUME);
}
}
scheduledBlocks.removeAll(finished);
finished.clear();
ByteBuffer.wrap(audioBuffer).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().put(mixBuffer);
line.write(audioBuffer, 0, audioBuffer.length);
position.addAndGet(BUFFER_SIZE_FRAMES);
}
}
public static void main(String[] args) {
System.out.print("Press return to exit...");
AudioConsumer consumer = new AudioConsumer();
consumer.start();
for (int i = 0; i < NUM_PRODUCERS; i++)
new AudioProducer(consumer).start();
System.console().readLine();
consumer.stop();
}
}
答案 2 :(得分：0)
你可以使用Tritontus库来进行软件音频混音（它已经过时但效果还不错）。
将依赖项添加到项目中：
<dependency>
<groupId>com.googlecode.soundlibs</groupId>
<artifactId>tritonus-all</artifactId>
<version>0.3.7.2</version>
</dependency>
使用org.tritonus.share.sampled.FloatSampleBuffer。在调用AudioFormat之前，两个缓冲区必须相同#mix。
// TODO instantiate these variables with real data
byte[] audio1, audio2;
AudioFormat af1, af2;
SourceDataLine sdl = AudioSystem.getSourceDataLine(af1);
FloatSampleBuffer fsb1 = new FloatSampleBuffer(audio1, 0, audio1.length, af1.getFormat());
FloatSampleBuffer fsb2 = new FloatSampleBuffer(audio2, 0, audio2.length, af2.getFormat());
fsb1.mix(fsb2);
byte[] result = fsb1.convertToByteArray(af1);
sdl.write(result, 0, result.length); // play it