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我尝试一次录制2种不同分辨率的视频。 有时一切顺利，有时应用程序似乎卡在2 MediaRecorders的stop（）方法中。有人可能会看我的代码，我是否做错了什么？使用camera2和MediaRecorder捕捉视频
package com.example.android.videorecording;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.MediaCodec;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.hardware.camera2.*;
import android.os.Environment;
import android.util.Size;
import android.view.Surface;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends Activity {
CameraDevice mCamera;
MediaRecorder mMediaRecorderLow = new MediaRecorder();
MediaRecorder mMediaRecorderHigh = new MediaRecorder();
CaptureRequest mCaptureRequest;
CameraCaptureSession mSession;
boolean recording = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CameraManager manager = (CameraManager) getSystemService(CAMERA_SERVICE);
File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
, "Test");
if(!dir.exists()) {
boolean s = dir.mkdirs();
if(!s) {
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setMessage("could not create dir");
alert.show();
}
}
final File outputFileLow = new File(dir.getAbsolutePath(), "testLow.mp4");
final File outputFileHigh = new File(dir.getAbsolutePath(), "testHigh.mp4");
try {
outputFileLow.createNewFile();
String[] cameras = manager.getCameraIdList();
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameras[0]);
StreamConfigurationMap configs = characteristics.get(
CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
Size[] sizes = configs.getOutputSizes(MediaCodec.class);
final Size sizeLow = sizes[5];
final Size sizeHigh = sizes[0];
manager.openCamera(cameras[0], new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice camera) {
mCamera = camera;
mMediaRecorderLow.setVideoSource(MediaRecorder.VideoSource.SURFACE);
mMediaRecorderLow.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mMediaRecorderLow.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
mMediaRecorderLow.setVideoSize(sizeLow.getWidth(), sizeLow.getHeight());
mMediaRecorderLow.setMaxFileSize(0);
mMediaRecorderLow.setOrientationHint(0);
mMediaRecorderHigh.setVideoSource(MediaRecorder.VideoSource.SURFACE);
mMediaRecorderHigh.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mMediaRecorderHigh.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
mMediaRecorderHigh.setVideoSize(sizeHigh.getWidth(), sizeHigh.getHeight());
mMediaRecorderHigh.setMaxFileSize(0);
mMediaRecorderLow.setOrientationHint(0);
try {
mMediaRecorderLow.setOutputFile(outputFileLow.getAbsolutePath());
mMediaRecorderHigh.setOutputFile(outputFileHigh.getAbsolutePath());
mMediaRecorderLow.prepare();
mMediaRecorderHigh.prepare();
List<Surface> list = new ArrayList<>();
list.add(mMediaRecorderLow.getSurface());
list.add(mMediaRecorderHigh.getSurface());
final CaptureRequest.Builder captureRequest = mCamera.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
captureRequest.addTarget(mMediaRecorderLow.getSurface());
captureRequest.addTarget(mMediaRecorderHigh.getSurface());
mCaptureRequest = captureRequest.build();
mCamera.createCaptureSession(list, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession session) {
mSession = session;
}
@Override
public void onConfigureFailed(CameraCaptureSession session) {
mSession = session;
}
}, null);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onDisconnected(CameraDevice camera) {
}
@Override
public void onError(CameraDevice camera, int error) {
}
}, null);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* is called by button, should start/stop recording
* @param v
*/
public void trigger(View v) {
((Button)findViewById(R.id.button)).setText("stop"); try {
if(!recording) {
mMediaRecorderLow.start();
mMediaRecorderHigh.start();
mSession.setRepeatingRequest(mCaptureRequest,
new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureStarted(CameraCaptureSession session, CaptureRequest request, long timestamp, long frameNumber) {
super.onCaptureStarted(session, request, timestamp, frameNumber);
}
@Override
public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
super.onCaptureCompleted(session, request, result);
}
}, null);
((Button)findViewById(R.id.button)).setText("stop");
recording = true;
} else {
((Button)findViewById(R.id.button)).setText("start");
recording = false;
mSession.stopRepeating();
mMediaRecorderHigh.stop();
mMediaRecorderLow.stop();
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
}