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–基于Android R(11)

关于Camera

Camera Framework 的架构

Android Camera Framework 是一个分层架构，由以下组件组成：

• HAL（硬件抽象层）: HAL 抽象底层相机硬件,提供与不同设备相机进行交互的标准接口.
• CameraService : CameraService 是框架的核心,管理相机设备并为应用程序提供访问 HAL 的接口.
• Camera 应用程序 : Camera 应用程序是面向用户的界面,允许用户控制相机设置、预览取景器并拍摄照片或视频.

以 Android 原生 Camera2 应用程序为例,PhotoModule 和 VideoModule 展示了如何使用 Camera Framework 构建高级相机应用程序.
PhotoModule 负责管理照片拍摄.
VideoModule 负责管理视频录制.

Android 最新Camera框架
Camera 架构
AndroidO Camera(API 2)openCamera 流程

关于Camera预览

Camera的图像数据来源于摄像头硬件的图像传感器,图像传感器被固定到手机上后会有一个默认的方向.
如果默认的图像传感器为横向,而所用设备拍照是竖向的,比如手机,但得到的图片数据依然会是横向的,因为这个数据取决于图像传感器的方向.

由于Camera默认是横向的,竖向拍照时得到的照片和预览的照片会有所不同.
Camera1 API 上可以利用setDisplayOrientation(int rotateDegree)设置预览角度调节预览图片.
setDisplayOrientation只是改变了预览的角度,而拍摄生成图片的角度还是和默认图片传感器方向一致.

Camera2 API --通过TextureView.setTransform(matrix) 接口来调整textureView的显示来达到目的,设置预览方向.

./packages/apps/Camera2/src/com/android/camera/one/v2/OneCameraImpl.java:400:                builder.set(CaptureRequest.JPEG_ORIENTATION,
./packages/apps/Camera2/src/com/android/camera/one/v2/SimpleOneCameraFactory.java:199:                rootBuilder.setParam(CaptureRequest.JPEG_ORIENTATION,
./packages/apps/Camera2/src/com/android/camera/one/v2/OneCameraZslImpl.java:824:                builder.set(CaptureRequest.JPEG_ORIENTATION,

public void openCamera(){CameraManager manager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);try {......//调整预览画面显示方向configureTextureViewTransform(mTextureView.getWidth(),mTextureView.getHeight());manager.openCamera(cameraId, mStateCallback, null);......}
}private void configureTextureViewTransform(int viewWidth, int viewHeight) {if (null == mTextureView) {return;}int rotation = 0 ;/*activity.getWindowManager().getDefaultDisplay().getRotation();*/Matrix matrix = new Matrix();RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());float centerX = viewRect.centerX();float centerY = viewRect.centerY();if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);float scale = Math.max((float) viewHeight / mPreviewSize.getHeight(),(float) viewWidth / mPreviewSize.getWidth());matrix.postScale(scale, scale, centerX, centerY);matrix.postRotate(90 * (rotation - 2), centerX, centerY);}else if (Surface.ROTATION_180 == rotation) {matrix.postRotate(180, centerX, centerY);}mTextureView.setTransform(matrix);}

关于Camera拍照生成图片角度处理

利用Camera拍照时,读取图片数据存储为图片,取到的数据直接来源于图像传感器采集到的图像数据.
所以拍摄生成图片的角度还是和默认图片传感器方向一致.
可以利用代码修改—拍摄生成图片的角度.

Camera2 API – 通过CaptureRequest.JPEG_ORIENTATION来设置拍照的图像方向

修改生成图片镜像
Android 7.1 RK3288 A40i Camera2 拍照镜像分析

./packages/apps/Camera2/src/com/android/camera/PhotoModule.javavoid saveFinalPhoto(final byte[] jpegData, final ExifInterface exif, CameraProxy camera) {if (mNamedImages == null)mNamedImages = new NamedImages();if (mNamedImages.mQueue.size() == 0)mNamedImages.nameNewImage(System.currentTimeMillis());int orientation = Exif.getOrientation(exif);float zoomValue = 1.0f;if (mCameraCapabilities.supports(CameraCapabilities.Feature.ZOOM)) {zoomValue = mCameraSettings.getCurrentZoomRatio();}...exif.setTag(directionRefTag);exif.setTag(directionTag);}+           //add text
+           Bitmap bitmap = CameraUtil.makeBitmap(jpegData, exifWidth * exifHeight);//jpeg byte 数组转换为bitmap
+           Matrix matrix = new Matrix();
+           matrix.postScale(-1, 1);//利用matrix 对矩阵进行转换 x轴镜像
+           bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
+           ByteArrayOutputStream baos = new ByteArrayOutputStream();
+           bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);//重新转换为 .jpeg 数据
+           byte [] tm_jpegData = baos.toByteArray();
+           //add text
+onMediaSavedListenerAfterBurstCapture mediaSavedListener = new onMediaSavedListenerAfterBurstCapture((mBurstPictureLength - mIndex));getServices().getMediaSaver().addImage(
-                            jpegData, title, date, mLocation, width, height,
+                            tm_jpegData, title, date, mLocation, width, height,orientation, exif, mediaSavedListener);}// Animate capture with real jpeg data instead of a preview

Android9.0 Camera2 横屏问题修改记录
Android Camera预览角度和拍照保存图片角度学习

修改摄像头旋转方向

可以驱动层,hal层,framework层,app层修改.

--- a/frameworks/base/core/java/android/hardware/Camera.java
+++ b/frameworks/base/core/java/android/hardware/Camera.java
@@ -399,7 +399,7 @@ public class Camera {* @see android.app.admin.DevicePolicyManager#getCameraDisabled(android.content.ComponentName)*/public static Camera open(int cameraId) {
-        return new Camera(cameraId);
+        return rotateCamera(i);}/**public static Camera open() {int numberOfCameras = getNumberOfCameras();CameraInfo cameraInfo = new CameraInfo();   for (int i = 0; i < numberOfCameras; i++) {getCameraInfo(i, cameraInfo);if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
-                return new Camera(i);
+                return rotateCamera(i);}}return null;}+    //add text
+    private static Camera rotateCamera(int cameraId) {
+        Camera camera = new Camera(cameraId);
+        Parameters parameters = camera.getParameters();
+        CameraInfo cameraInfo = new CameraInfo();
+        getCameraInfo(cameraId, cameraInfo);
+        if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {//0 后置
+            camera.setDisplayOrientation(270);
+            parameters.setRotation(270);
+        } else if (cameraInfo.facing == CameraInfo.CAMERA_FACING_FRONT) {// 1 前置
+            camera.setDisplayOrientation(90);
+            parameters.setRotation(90);
+        }
+        camera.setParameters(parameters);
+        return camera;
+    }
+    //add text
+

修改某个apk应用拿到的SENSOR_ORIENTATION方向,影响Camera拍照生成图片角度.

frameworks/base/core/java/android/hardware/camera2/CameraCharacteristics.java@PublicKey@NonNullpublic static final Key<Integer> SENSOR_ORIENTATION =new Key<Integer>("android.sensor.orientation", int.class);@Nullablepublic <T> T get(Key<T> key) {//add text  Log.d("tag",  "Activity name: " + ActivityThread.currentActivityThread().currentActivityName() + " ,key = " + key);if(key != null && SENSOR_ORIENTATION.equals(key)){if(ActivityThread.currentOpPackageName().contains("com.xxx")){//String cameraId = CameraManager.getCameraId();if(cameraId != null){T value = (T)(Object)90;Log.d("tag",  "value = " + value + " ,ori = " + mProperties.get(key));return value;}}//add text    return mProperties.get(key);}   

三方Camera App Framework方向控制（API2）

改变摄像头成像方向
camera3_profiles_rk356x.xml,这个配置说明了这个板子所有支持的摄像头配置.
RK 硬件的camera配置文件中找到ov8858摄像头设备，并修改其sensor.orientation value 的值.

hardware/rockchip/camera/etc/camera/camera3_profiles_rk356x.xml
<Profiles cameraId="0" name="ov8858" moduleId="m00"><Supported_hardware><hwType value="SUPPORTED_HW_RKISP1"/></Supported_hardware>...<!-- Sensor --><sensor.orientation value="270"/><!-- Sensor -->

rk356x OpenCamera流程浅析