前言
MediaRecorder可以不依靠Camera API 实现视频的录制,但是如果需要切换摄像头/设置对焦/选择分辨率等等就需要Camera来参与配合录制视频.这篇博客将介绍使用Camera1来实现视频录制.此篇博客不在重复一些细节和坑的介绍.如果你刚接触建议你看我另一篇博客https://www.cnblogs.com/guanxinjing/p/10980906.html这篇博客用更简单易懂的形式说明了MediaRecorder录制视频的步骤,并且有大量深坑的详解介绍,防止你也掉坑里.
实现流程
- 设置TextureView的硬件加速
- 获取权限
- 初始化TextureView的监听
- 初始化MediaRecorder
- 初始化Camera
- 初始化配置Camera
- 开始相机预览
- 配置MediaRecorder(每次录制之前都需要配置一次)
- 开始录制
- 停止录制
- 恢复相机预览
代码部分
关键点有大量注释,就不做另外篇幅的介绍
如果你对下面代码里的计算分辨率不甚理解,可以去我另一篇博客有更详细的讲解分辨率的计算,这篇博客虽然是拿Camera2 API来计算分辨率,但是原理是一样的. 传送门:https://www.cnblogs.com/guanxinjing/p/10943966.html
如果你对Camera自动对焦不太理解,可以去我另一篇更详细的博客有介绍Camera1的自动对焦. 传送门:https://www.cnblogs.com/guanxinjing/p/10986249.html
import androidx.appcompat.app.AppCompatActivity; import android.graphics.SurfaceTexture; import android.hardware.Camera; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.DisplayMetrics; import android.util.Log; import android.view.Surface; import android.view.TextureView; import android.view.View; import android.widget.Button; import java.io.File; import java.io.IOException; import java.util.List; public class MedioRecorderCamera1Activity extends AppCompatActivity implements View.OnClickListener { private static final String TAG = MedioRecorderCamera1Activity.class.getSimpleName(); private TextureView mTextureview; private Button mBtnStart, mBtnFinish; private MediaRecorder mMediaRecorder; private Camera mCamera; private Camera.Size mSelectSize;//记录当前选择的分辨率 private boolean isRecorder = false;//用于判断当前是否在录制视频 private Handler mHandler = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what){ case 0x01: mCamera.autoFocus(new Camera.AutoFocusCallback() { //自动对焦 @Override public void onAutoFocus(boolean success, Camera camera) { } }); mHandler.sendEmptyMessageDelayed(0x01,2*1000);//2秒之后在对焦一次,一直重复自动对焦 break; default: break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_medio_recorder_camera1); mTextureview = findViewById(R.id.textureview); mBtnStart = findViewById(R.id.btn_start); mBtnFinish = findViewById(R.id.btn_finish); mBtnStart.setOnClickListener(this); mBtnFinish.setOnClickListener(this); initTextureViewListener(); initMediaRecorder(); } /** * 初始化TextureView监听 */ private void initTextureViewListener(){ mTextureview.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() { @Override public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) { //Textureview初始化启用回调 initCamera(); initCameraConfig(); try { mCamera.setPreviewTexture(surface); mCamera.startPreview(); mHandler.sendEmptyMessage(0x01);//启动对焦 } catch (IOException e) { e.printStackTrace(); } } @Override public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) { } @Override public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) { return false; } @Override public void onSurfaceTextureUpdated(SurfaceTexture surface) { } }); } @Override public void onClick(View v) { switch (v.getId()){ case R.id.btn_start: startRecorder(); break; case R.id.btn_finish: stopRecorder(); break; default: break; } } /** * 初始化MediaRecorder */ private void initMediaRecorder(){ mMediaRecorder = new MediaRecorder(); } /** * 选择摄像头 * @param isFacing true=前摄像头 false=后摄像头 * @return 摄像id */ private Integer selectCamera(boolean isFacing){ int cameraCount = Camera.getNumberOfCameras(); // CameraInfo.CAMERA_FACING_BACK 后摄像头 // CameraInfo.CAMERA_FACING_FRONT 前摄像头 int facing = isFacing ? Camera.CameraInfo.CAMERA_FACING_FRONT : Camera.CameraInfo.CAMERA_FACING_BACK; Log.e(TAG, "selectCamera: cameraCount="+cameraCount); if (cameraCount == 0){ Log.e(TAG, "selectCamera: The device does not have a camera "); return null; } Camera.CameraInfo info = new Camera.CameraInfo(); for (int i=0; i < cameraCount; i++){ Camera.getCameraInfo(i,info); if (info.facing == facing){ return i; } } return null; } /** * 初始化相机 */ private void initCamera(){ mCamera = Camera.open(selectCamera(false)); mSelectSize = selectPreviewSize(mCamera.getParameters()); } /** * 初始化相机配置 */ private void initCameraConfig(){ Camera.Parameters parameters = mCamera.getParameters(); parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);//关闭闪光灯 parameters.setFocusMode(Camera.Parameters.FLASH_MODE_AUTO); //对焦设置为自动 parameters.setPreviewSize(mSelectSize.width,mSelectSize.height);//设置预览尺寸 parameters.setPictureSize(mSelectSize.width,mSelectSize.height);//设置图片尺寸 就拿预览尺寸作为图片尺寸,其实他们基本上是一样的 parameters.set("orientation", "portrait");//相片方向 parameters.set("rotation", 90); //相片镜头角度转90度（默认摄像头是横拍） mCamera.setParameters(parameters);//添加参数 mCamera.setDisplayOrientation(90);//设置显示方向 } /** * 计算获取预览尺寸 * @param parameters * @return */ private Camera.Size selectPreviewSize(Camera.Parameters parameters){ List<Camera.Size> previewSizeList = parameters.getSupportedPreviewSizes(); if (previewSizeList.size() == 0){ Log.e(TAG, "selectPreviewSize: previewSizeList size is 0" ); return null; } Camera.Size currentSelectSize = null; DisplayMetrics displayMetrics = getResources().getDisplayMetrics(); int deviceWidth =displayMetrics.widthPixels; int deviceHeight = displayMetrics.heightPixels; for (int i = 1; i < 41 ; i++){ for(Camera.Size itemSize : previewSizeList){ // Log.e(TAG, "selectPreviewSize: itemSize 宽="+itemSize.width+"高"+itemSize.height); if (itemSize.height > (deviceWidth - i*5) && itemSize.height < (deviceWidth + i*5)){ if (currentSelectSize != null){ //如果之前已经找到一个匹配的宽度 if (Math.abs(deviceHeight-itemSize.width) < Math.abs(deviceHeight - currentSelectSize.width)){ //求绝对值算出最接近设备高度的尺寸 currentSelectSize = itemSize; continue; } }else { currentSelectSize = itemSize; } } } } Log.e(TAG, "selectPreviewSize: 当前选择的尺寸 宽="+currentSelectSize.width+"高"+currentSelectSize.height); return currentSelectSize; } /** * 配置MedioRecorder */ private void configMedioRecorder(){ File saveRecorderFile = new File(getExternalCacheDir(),"CameraRecorder.mp4"); if (saveRecorderFile.exists()){ saveRecorderFile.delete(); } mCamera.unlock(); mMediaRecorder.setCamera(mCamera); mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);//设置音频源 mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);//设置视频源 mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);//设置音频输出格式 mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);//设置音频编码格式 mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);//设置视频编码格式 mMediaRecorder.setVideoSize(mSelectSize.width,mSelectSize.height);//设置视频分辨率 mMediaRecorder.setVideoEncodingBitRate(8*1920*1080);//设置视频的比特率 mMediaRecorder.setVideoFrameRate(60);//设置视频的帧率 mMediaRecorder.setOrientationHint(90);//设置视频的角度 mMediaRecorder.setMaxDuration(60*1000);//设置最大录制时间 Surface surface = new Surface(mTextureview.getSurfaceTexture()); mMediaRecorder.setPreviewDisplay(surface);//设置预览 mMediaRecorder.setOutputFile(saveRecorderFile.getAbsolutePath());//设置文件保存路径 mMediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener() { //录制异常监听 @Override public void onError(MediaRecorder mr, int what, int extra) { mMediaRecorder.stop(); mMediaRecorder.reset(); try { mCamera.setPreviewTexture(mTextureview.getSurfaceTexture()); mCamera.startPreview(); } catch (IOException e) { e.printStackTrace(); } } }); } /** * 开启录制视频 */ private void startRecorder(){ if (!isRecorder) {//如果不在录制视频 mCamera.stopPreview();//暂停相机预览 configMedioRecorder();//再次配置MedioRecorder try { mMediaRecorder.prepare();//准备录制 } catch (IOException e) { e.printStackTrace(); } mMediaRecorder.start();//开始录制 isRecorder = true; } } /** * 停止录制视频 */ private void stopRecorder(){ if (isRecorder){ //如果在录制视频 mMediaRecorder.stop();//暂停录制 mMediaRecorder.reset();//重置,将MediaRecorder调整为空闲状态 isRecorder = false; try { mCamera.setPreviewTexture(mTextureview.getSurfaceTexture());//重新设置预览SurfaceTexture mCamera.startPreview(); //重新开启相机预览 mCamera.autoFocus(new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { } }); } catch (IOException e) { e.printStackTrace(); } } } @Override protected void onDestroy() { super.onDestroy(); if (mMediaRecorder != null){ if (isRecorder) { mMediaRecorder.stop(); } mMediaRecorder.release(); mMediaRecorder = null; } if (mCamera != null){ mCamera.stopPreview(); mCamera.release(); mCamera = null; } } }
这里说明一下为什么在配置MediaRecorder的时候大量使用DEFAULT 默认模式,是因为如果选定一个模式,并不一定所有机型都是适配的,所有为了安全适配所有机型这里最好选择默认.
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);//设置音频源 mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);//设置视频源 mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);//设置音频输出格式 mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);//设置音频编码格式 mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);//设置视频编码格式