android 局域网对讲机

参考了一些代码，实现了局域网的实时语音对讲功能，只要同网段局域网即可通话，文字聊天，传输文件等，包含了飞鸽传输的功能。

主要是录音发送和接收播放录音比较重要。录音线程：

Java代码

public class AudioSend extends Thread {
Person person = null;
public AudioSend(Person person) {
this.person = person;
// android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
}
@Override
public void run() {
super.run();
Socket socket = null;
OutputStream os = null;
AudioRecord recorder = null;
try {
socket = new Socket(person.ipAddress, Constant.AUDIO_PORT);
socket.setSoTimeout(5000);
os = socket.getOutputStream();
// 获得录音缓冲区大小
int bufferSize = AudioRecord.getMinBufferSize(FlyGeonApplication.getInstance().sampRate, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT);
Log.e("", "录音缓冲区大小"+bufferSize);
// 获得录音机对象
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, FlyGeonApplication.getInstance().sampRate, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, bufferSize * 10);
recorder.startRecording();// 开始录音
byte[] readBuffer = new byte[640];// 录音缓冲区
int length = 0;
while (!isStopTalk) {
length = recorder.read(readBuffer, 0, 640);// 从mic读取音频数据
if (length > 0 && length % 2 == 0) {
os.write(readBuffer, 0, length);// 写入到输出流，把音频数据通过网络发送给对方
}
}
recorder.stop();
recorder.release();
recorder = null;
os.close();
socket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

接收播放线程

Java代码

public class AudioPlay extends Thread {
Socket socket = null;
public AudioPlay(Socket socket) {
this.socket = socket;
// android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
}
@Override
public void run() {
super.run();
try {
InputStream is = socket.getInputStream();
// 获得音频缓冲区大小
int bufferSize = android.media.AudioTrack.getMinBufferSize(FlyGeonApplication.getInstance().sampRate,
AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT);
Log.e("", "播放缓冲区大小"+bufferSize);
// 获得音轨对象
AudioTrack player = new AudioTrack(FlyGeonApplication.getInstance().getVoiceMode(), FlyGeonApplication.getInstance().sampRate,
AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize,
AudioTrack.MODE_STREAM);
// 设置喇叭音量
player.setStereoVolume(1.0f, 1.0f);
// 开始播放声音
player.play();
byte[] audio = new byte[160];// 音频读取缓存
int length = 0;
while (!isStopTalk) {
length = is.read(audio);// 从网络读取音频数据
byte[] temp = audio.clone();
if (length > 0 && length % 2 == 0) {
// for(int
// i=0;i
player.write(audio, 0, temp.length);// 播放音频数据
}
}
player.stop();
player.release();
player = null;
is.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

AudioTrack player = new AudioTrack(FlyGeonApplication.getInstance().getVoiceMode(), FlyGeonApplication.getInstance().sampRate,
AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize,
AudioTrack.MODE_STREAM);

其中第二个参数与机器有关，一般为8000。我在解决这个问题时就是遍历一遍常见的可能数值，直到正确为止。

第一个参数是声音的播放模式，可以为听筒模式和扬声器模式。由于扬声器模式会有回音，所以一般用听筒模式即可。

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