音频录制完成之后格式为raw格式，但是为了节省服务器空间，一般会将raw格式文件进行压缩MP3
本文实现了录音生成本地文件后，然后将raw压缩为MP3文件
废话不多说上代码
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import com.pocketdigi.utils.FLameUtils;
import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class AudioRecorder2Mp3Util {
private Activity activity;
public static final int RAW = 0X00000001;
public static final int MP3 = 0X00000002;
private String rawPath = null;
private String mp3Path = null;
private static final int SAMPLE_RATE = 8000;
private short[] mBuffer;
private AudioRecord mRecorder;
public AudioRecorder2Mp3Util(Activity activity) {
this.activity = activity;
}
private boolean isRecording = false;
private boolean convertOk = false;
public AudioRecorder2Mp3Util(Activity activity, String rawPath, String mp3Path) {
this.activity = activity;
this.rawPath = rawPath;
this.mp3Path = mp3Path;
}
public boolean startRecording() {
boolean valid = false;
if (isRecording) {
return isRecording;
}
if (mRecorder == null) {
valid = initRecorder();
}
if (valid) {
getFilePath();
try {
mRecorder.startRecording();
startBufferedWrite(new File(rawPath));
isRecording = true;
} catch (Exception e) {
e.printStackTrace();
isRecording = false;
}
} else {
isRecording = false;
}
return isRecording;
}
public boolean stopRecordingAndConvertFile() {
if (!isRecording) {
return isRecording;
}
mRecorder.stop();
isRecording = false;
FLameUtils lameUtils = new FLameUtils(2, SAMPLE_RATE, 96);
convertOk = lameUtils.raw2mp3(rawPath, mp3Path);
return isRecording ^ convertOk;// convertOk==true,return true
}
public boolean stopRecording() {
if (!isRecording) {
return isRecording;
}
mRecorder.stop();
isRecording = false;
return true;
}
public String getFilePath(int fileAlias) {
if (fileAlias == RAW) {
return rawPath;
} else if (fileAlias == MP3) {
return mp3Path;
} else
return null;
}
/**
* @param cleanFlag RAW,MP3 or RAW|MP3
*/
public void cleanFile(int cleanFlag) {
File f = null;
try {
switch (cleanFlag) {
case MP3:
f = new File(mp3Path);
if (f.exists())
f.delete();
break;
case RAW:
f = new File(rawPath);
if (f.exists())
f.delete();
break;
case RAW | MP3:
f = new File(rawPath);
if (f.exists())
f.delete();
f = new File(mp3Path);
if (f.exists())
f.delete();
break;
}
f = null;
} catch (Exception e) {
e.printStackTrace();
}
}
public void close() {
if (mRecorder != null)
mRecorder.release();
}
private boolean initRecorder() {
boolean valid = false;
try {
int bufferSize = AudioRecord.getMinBufferSize(SAMPLE_RATE, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
mBuffer = new short[bufferSize];
mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);
valid = true;
} catch (Exception e) {
e.printStackTrace();
}
return valid;
}
private void getFilePath() {
try {
String folder = "audio_recorder_2_mp3";
String fileName = String.valueOf(System.currentTimeMillis());
if (rawPath == null) {
File raw = new File(activity.getDir(folder, activity.MODE_PRIVATE), fileName + ".raw");
raw.createNewFile();
rawPath = raw.getAbsolutePath();
raw = null;
}else {
File file = new File(rawPath);
if (!file.exists()){
file.createNewFile();
}
}
if (mp3Path == null) {
File mp3 = new File(activity.getDir(folder, activity.MODE_PRIVATE), fileName + ".mp3");
mp3.createNewFile();
mp3Path = mp3.getAbsolutePath();
mp3 = null;
}
runCommand("chmod 777 " + rawPath);
runCommand("chmod 777 " + mp3Path);
} catch (Exception e) {
e.printStackTrace();
}
}
private boolean runCommand(String command) {
boolean ret = false;
Process process = null;
try {
process = Runtime.getRuntime().exec(command);
process.waitFor();
ret = true;
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
process.destroy();
} catch (Exception e) {
e.printStackTrace();
}
}
return ret;
}
private void startBufferedWrite(final File file) {
new Thread(new Runnable() {
@Override
public void run() {
DataOutputStream output = null;
try {
output = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file)));
while (isRecording) {
int readSize = mRecorder.read(mBuffer, 0, mBuffer.length);
for (int i = 0; i < readSize; i++) {
output.writeShort(mBuffer[i]);
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (output != null) {
try {
output.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}).start();
}
class Sample {
AudioRecorder2Mp3Util util = null;
String mp3 = null;
String raw = null;
void start() {
if (util == null)
util = new AudioRecorder2Mp3Util(null, "/sdcard/sample.raw", "/sdcard/sample.mp3");
if (mp3 != null || raw != null) {
util.cleanFile(RAW | MP3);
}
util.startRecording();
}
void stop() {
boolean isOK = util.stopRecordingAndConvertFile();
raw = util.getFilePath(RAW);
mp3 = util.getFilePath(MP3);
util.cleanFile(RAW);
util.close();
}
}
}
压缩MP3使用的是lame库我直接分享出来拷到项目就可以直接用了
链接:http://pan.baidu.com/s/1kVcgqMz 密码:ezrc
下面是lame库的下载地址 jar包libs文件夹 .so文件放jniLibs文件夹你懂得~~
