录像过程中拍照的流程 从framework到hal

• 由 178903294创建, 最后修改于1月 20, 2020

在VideoMode.java中 当拍照键按下

VideoMode.java

private View.OnClickListener mVssListener = new View.OnClickListener() {           public void onClick(View view) { ~             LogHelper.i(TAG, "[mVssListener] bjq click video state = "                                   + mVideoState + "mCanTakePicture = " + mCanTakePicture);               if ((getVideoState() == VideoState.STATE_PAUSED ||                       getVideoState() == VideoState.STATE_RECORDING) && mCanTakePicture) {                   mAppUi.animationStart(IAppUi.AnimationType.TYPE_CAPTURE, null);                   mCameraDevice.updateGSensorOrientation(mApp.getGSensorOrientation());                   mCameraDevice.takePicture(mJpegCallback);                   mCanTakePicture = false;               }           }       };

调用mCameraDevice.takePicture(mJpegCallback);          这里面的mJpegCallback  是处理数据回调保存的函数

VideoDevice2Controller.java

@Override       public void takePicture(@Nonnull JpegCallback callback) { ~         LogHelper.e(TAG, "[takePicture] bjq +");           mJpegCallback = callback;           CaptureRequest.Builder builder;           try {               builder = mCamera2Proxy.createCaptureRequest(Camera2Proxy.TEMPLATE_VIDEO_SNAPSHOT);               configureQuickPreview(builder);               builder.addTarget(mPreviewSurface);               builder.addTarget(mRecordSurface);               builder.addTarget(mCaptureSurface.getSurface()); +             builder.set(CaptureRequest.CONTROL_AE_MODE,   //加入这个自动白平衡 暗光条件下录像过程中拍照一片黑暗的问题就临时解决了 +                     CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);               int rotation = CameraUtil.getJpegRotation(Integer.parseInt(mCameraId),                       mJpegRotation, mActivity);               builder.set(CaptureRequest.JPEG_ORIENTATION, rotation);               mSettingDevice2Configurator.configCaptureRequest(builder);               mSession.capture(builder.build(), mCaptureCallback, mModeHandler);           } catch (CameraAccessException e) {               e.printStackTrace();           } ~         LogHelper.e(TAG, "[takePicture] bjq -");       }

mCamera2Proxy.createCaptureRequest(Camera2Proxy.TEMPLATE_VIDEO_SNAPSHOT)   这里定义了拍照的模式：TEMPLATE_VIDEO_SNAPSHOT   视频快门模式

 

接着调用 mSession.capture(builder.build(), mCaptureCallback, mModeHandler);    注意这里传入了一个Handler 以后会用到

 

Camera2CaptureSessionProxy.java

public int capture(@Nonnull CaptureRequest request, @Nullable CaptureCallback listener,                    @Nullable Handler handler) throws CameraAccessException {        int[] captureNum = new int[1];        List<CaptureRequest> requestList = new ArrayList<>();        requestList.add(request);        SessionOperatorInfo info = new SessionOperatorInfo(requestList, listener, handler,                        captureNum);        Message msg = mRequestHandler.obtainMessage(Camera2Actions.CAPTURE, info);        mAtomAccessor.sendAtomMessageAndWait(mRequestHandler, msg);        return captureNum[0];    }

调用mAtomAccessor.sendAtomMessageAndWait(mRequestHandler, msg);

AtomAccessor.java

public void sendAtomMessageAtFrontOfQueue(Handler handler, Message msg) {           if (handler == null || msg == null) {               return;           }           acquireResource(); +         LogHelper.i(TAG, "bjq sendAtomMessageAtFrontOfQueue");           handler.sendMessageAtFrontOfQueue(msg);           releaseResource();       }

接着调用Handler.java的sendMessageAtFrontOfQueue 加入消息队列并处理对应的handel

 

Handler.java

public final boolean sendMessageAtFrontOfQueue(Message msg) {        MessageQueue queue = mQueue;        if (queue == null) {            RuntimeException e = new RuntimeException(                this + " sendMessageAtTime() called with no mQueue");            Log.w("Looper", e.getMessage(), e);            return false;