Android — MediaRecord – 我爱物联网

MediaRecord

集成了录音、编码、压缩等,支持少量的录音音频格式,大概有.aac .amr .3gp

优点:大部分以及集成,直接调用相关接口即可,代码量小

缺点:无法实时处理音频;输出的音频格式不是很多,例如没有输出mp3格式文件

WAV格式:录音质量高,但是压缩率小,文件大

AAC格式:相对于mp3,AAC格式的音质更佳,文件更小;有损压缩;一般苹果或者Android SDK4.1.2(API 16)及以上版本支持播放

AMR格式:压缩比比较大,但相对其他的压缩格式质量比较差,多用于人声,通话录音

至于常用的mp3格式,使用MediaRecorder没有该视频格式输出。一些人的做法是使用AudioRecord录音,然后编码成wav格式,再转换成mp3格式

举个栗子

MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(PATH_NAME);
recorder.prepare();
recorder.start(); // Recording is now started
//...
recorder.stop();
recorder.reset(); // You can reuse the object by going back to setAudioSource() step
recorder.release(); // Now the object cannot be reused

Demo

public static final String DIR = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "1122" + File.separator;

private Button mStartBtn;
private Button mStopBtn;
private MediaRecorder mMediaRecorder;
private boolean mIsRecoding = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sound);
mStartBtn = (Button) findViewById(R.id.btn_start);
mStartBtn.setOnClickListener(this);
mStopBtn = (Button) findViewById(R.id.btn_stop);
mStopBtn.setOnClickListener(this);
initSound();
}

private void initSound() {
mMediaRecorder = new MediaRecorder();
// 从麦克风源进行录音
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
// 设置输出格式
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
// 设置编码格式
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_start:
File dir = new File(DIR);
if (!dir.exists()) {
dir.mkdir();
}
if (!mIsRecoding) {
long time = System.currentTimeMillis();
String fileName = time + ".amr";
File file = new File(DIR + fileName);
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
mMediaRecorder.setOutputFile(DIR + fileName);
try {
mMediaRecorder.prepare();
mMediaRecorder.start();
} catch (IOException e) {
e.printStackTrace();
}
mIsRecoding = true;
}
break;
case R.id.btn_stop:
if (mIsRecoding) {
mMediaRecorder.stop();
mMediaRecorder.release();
mIsRecoding = false;
}
break;
}
}

权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />

截图

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