嗨，我正在尝试制作一个录像机 Android 应用程序>出于某种原因，我需要获取它的音频，我尝试了一些库，但没有真正提取我的音频。所以现在我的方法是，我可以分别录制视频和音频，而不是使用本机库吗？主线程录制视频，另一个线程录制音频。当我在线程内调用媒体记录器类的 start() 方法时出现错误，我得到 Start Failed -22。以下是我的代码。
public class MainActivity extends Activity {
private SurfaceHolder surfaceHolder;
private SurfaceView surfaceView;
public MediaRecorder mrec ;
ImageView recordingBt;
public MediaRecorder mrec2 = new MediaRecorder();
File video;
private Camera mCamera;
File audiofile = null;
File audiofile2 = null;
boolean recording=false;
TextView tv;
View myview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recordingBt= (ImageView) findViewById(R.id.camera);
surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
tv=(TextView) findViewById(R.id.textView1);
myview = findViewById(R.id.MyBigView);
}
@Override
protected void onStart(){
super.onStart();
Log.i("Recording Activity", "we are inside Start function of Recording Activity");
Log.i("Recording Activity", "Opening camera");
mCamera = Camera.open();
Log.i("Recording Activity", "Camera Opened");
surfaceHolder = surfaceView.getHolder();
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
recordingBt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(recording==false){
try {
Log.i("Recording Activity", "Recording Start");
startRecording();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else{
stopRecording();
}
}
});}
public void startRecording() throws IOException
{
recording=true;
String path= Environment.getExternalStorageDirectory().toString();
File sampleDir = new File(path+"/DCIM/Squlium Booth");
sampleDir.mkdir();
Log.i("Setting Path", sampleDir.toString());
try {
audiofile = File.createTempFile("SqB", ".3gp", sampleDir);
} catch (IOException e) {
return;}
Log.i("Recording Activity", "Seting Media Recorder attributes");
mrec = new MediaRecorder(); // Works well
mCamera.unlock();
mrec.setCamera(mCamera);
mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
mrec.setMaxDuration(60000);
mrec.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
mrec.setOutputFile(audiofile.getAbsolutePath());
mrec.prepare();
mrec.start();
startProgress(myview);
}
protected void stopRecording() {
recording=false;
mrec.stop();
mrec.release();
mCamera.lock();
mCamera.release();
mrec2.stop();
mrec.release();
}
public void startProgress(View view) {
// Do something long
Runnable runnable = new Runnable() {
@Override
public void run() {
String path= Environment.getExternalStorageDirectory().toString();
File sampleDir = new File(path+"/DCIM/Squlium Booth");
sampleDir.mkdir();
try {
audiofile2 = File.createTempFile("myAudio", ".mp3", sampleDir);
} catch (IOException e) {
return;}
int minBufferSize = AudioRecord.getMinBufferSize(8000,
AudioFormat .CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT);
mrec2.setAudioSource(MediaRecorder.AudioSource.MIC);
mrec2.setAudioSamplingRate(16000);
mrec2.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
mrec2.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mrec2.setOutputFile(audiofile2.getAbsolutePath());
try {
mrec2.prepare();
} catch (IllegalStateException e1) {
Log.i("Illegal", "Exception");
e1.printStackTrace();
} catch (IOException e1) {
Log.i("Iinput output", "Exception");
}
Log.i("Inside Run Method", "Starting Thread soon there will be issue");
mrec2.start();
Log.i("Inside Run Method", "After start method inside thread");
Log.i("Inside Thread", "Alive");
}
};
new Thread(runnable).start();
}