Android音频开发之AudioRecord录音实现
2024-10-10 16:46:46
前言：
其实在Android中录音可以用MediaRecord录音，操作比较简单。但是不能对音频进行处理。考虑到项目中做的是实时语音只能选择AudioRecord进行录音。
本文算是对AudioRecord来个回顾：
public class AudioRecordManager {
public static final String TAG = "AudioRecordManager";
private AudioRecord mRecorder;
private DataOutputStream dos;
private Thread recordThread;
private boolean isStart = false;
private static AudioRecordManager mInstance;
private int bufferSize;
public AudioRecordManager() {
bufferSize = AudioRecord.getMinBufferSize(8000, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
mRecorder = new AudioRecord(AudioSource.MIC, 8000, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize * 2);
}
/**
* 获取单例引用
*
* @return
*/
public static AudioRecordManager getInstance() {
if (mInstance == null) {
synchronized (AudioRecordManager.class) {
if (mInstance == null) {
mInstance = new AudioRecordManager();
}
}
}
return mInstance;
}
/**
* 销毁线程方法
*/
private void destroyThread() {
try {
isStart = false;
if (null != recordThread && Thread.State.RUNNABLE == recordThread.getState()) {
try {
Thread.sleep(500);
recordThread.interrupt();
} catch (Exception e) {
recordThread = null;
}
}
recordThread = null;
} catch (Exception e) {
e.printStackTrace();
} finally {
recordThread = null;
}
}
/**
* 启动录音线程
*/
private void startThread() {
destroyThread();
isStart = true;
if (recordThread == null) {
recordThread = new Thread(recordRunnable);
recordThread.start();
}
}
/**
* 录音线程
*/
Runnable recordRunnable = new Runnable() {
@Override
public void run() {
try {
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
int bytesRecord;
//int bufferSize = 320;
byte[] tempBuffer = new byte[bufferSize];
if (mRecorder.getState() != AudioRecord.STATE_INITIALIZED) {
stopRecord();
return;
}
mRecorder.startRecording();
//writeToFileHead();
while (isStart) {
if (null != mRecorder) {
bytesRecord = mRecorder.read(tempBuffer, 0, bufferSize);
if (bytesRecord == AudioRecord.ERROR_INVALID_OPERATION || bytesRecord == AudioRecord.ERROR_BAD_VALUE) {
continue;
}
if (bytesRecord != 0 && bytesRecord != -1) {
//在此可以对录制音频的数据进行二次处理 比如变声，压缩，降噪，增益等操作
//我们这里直接将pcm音频原数据写入文件 这里可以直接发送至服务器 对方采用AudioTrack进行播放原数据
dos.write(tempBuffer, 0, bytesRecord);
} else {
break;
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
/**
* 保存文件
*
* @param path
* @throws Exception
*/
private void setPath(String path) throws Exception {
File file = new File(path);
if (file.exists()) {
file.delete();
}
file.createNewFile();
dos = new DataOutputStream(new FileOutputStream(file, true));
}
/**
* 启动录音
*
* @param path
*/
public void startRecord(String path) {
try {
setPath(path);
startThread();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 停止录音
*/
public void stopRecord() {
try {
destroyThread();
if (mRecorder != null) {
if (mRecorder.getState() == AudioRecord.STATE_INITIALIZED) {
mRecorder.stop();
}
if (mRecorder != null) {
mRecorder.release();
}
}
if (dos != null) {
dos.flush();
dos.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
使用前要添加如下权限：
<!-- 录音权限 -->
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
相关音频知识链接：
http://ticktick.blog.51cto.com/823160/1748506
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