MediaRecorder
AudioRecord
- MediaRecorder
需要的权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
/**
* 开始录音
*/
class startRecordListener implements OnClickListener {
@Override public void onClick(View v) {
try {
MediaRecorder mRecorder = new MediaRecorder();
// 设置声音源为麦克风
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
// 设置输出格式为3gp
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
// 设置输出文件路径，mFileName为录音音频输出路径
mRecorder.setOutputFile(mFileName);
// 设置声音解码AMR_NB
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
// 媒体录制器准备
mRecorder.prepare();
// 开始录制
mRecorder.start();
} catch (IOException e) {
}
}
}
/**
* 停止录音
*/
class stopRecordListener implements OnClickListener {
@Override public void onClick(View v) {
mRecorder.stop();
mRecorder.release();
mRecorder = null;
}
}
2.AudioRecord
AudioRecord录音步骤：
1. 创建一个数据流。
2. 构造一个AudioRecord对象，其中需要的最小录音缓存buffer大小可以通过getMinBufferSize方法得到。如果buffer容量过小，将导致对象构造的失败。
3. 初始化一个buffer，该buffer大于等于AudioRecord对象用于写声音数据的buffer大小。
4. 开始录音。
5. 从AudioRecord中读取声音数据到初始化buffer，将buffer中数据导入数据流。
6. 停止录音。
7. 关闭数据流。
录音代码：
/**
* 录音,需要在新的线程中执行，防止主线程阻塞
*/
private void record() {
int frequency = 11025;
int channelConfiguration = AudioFormat.CHANNEL_IN_STEREO;
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
try {
// 创建一个数据输入流往文件里写数据
OutputStream os = new FileOutputStream(mFileName);
BufferedOutputStream bos = new BufferedOutputStream(os);
DataOutputStream dos = new DataOutputStream(bos);
// 创建一个AudioRecord对象来录音
int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding);
AudioRecord mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency, channelConfiguration,
audioEncoding, bufferSize);
short[] buffer = new short[bufferSize];
// 开始录音
mAudioRecord.startRecording();
isRecording = true;
Log.e(TAG, "record: 录音开始");
while (isRecording) {
int bufferReadResult = mAudioRecord.read(buffer, 0, bufferSize);
for (int i = 0; i < bufferReadResult; i++) {
dos.writeShort(buffer[i]);
Log.e(TAG, "record: 录音中...");
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 停止录音
*/
class stopRecordListener implements OnClickListener {
@Override public void onClick(View v) {
mAudioRecord.stop();
Log.e(TAG, "record: 录音结束");
}
}
播放代码：
/**
* 播放录音
*/
class startPlayListener implements OnClickListener {
@Override public void onClick(View v) {
try {
// Get the file we want to playback.
File file = new File(mFileName);
// Get the length of the audio stored in the file (16 bit so 2 bytes per short)
// and create a short array to store the recorded audio.
int musicLength = (int) (file.length() / 2);
short[] music = new short[musicLength];
// Create a DataInputStream to read the audio data back from the saved file
InputStream is = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(is);
DataInputStream dis = new DataInputStream(bis);
// Read the file into the music array.
int i = 0;
while (dis.available() > 0) {
music[i++] = dis.readShort();
}
// close the input streams
dis.close();
// Create a new AudioTrack object using the same parameters as the AudioRecord
// object used to create the file.
AudioTrack audioTrack =
new AudioTrack(AudioManager.STREAM_MUSIC, 11025, AudioFormat.CHANNEL_IN_STEREO,
AudioFormat.ENCODING_PCM_16BIT, musicLength * 2, AudioTrack.MODE_STREAM);
Log.e(TAG, "onClick: 开始播放");
// Start playback
audioTrack.play();
// Write the music buffer to the AudioTrack object
audioTrack.write(music, 0, musicLength);
Log.e(TAG, "onClick: 播放结束");
audioTrack.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
