android之camera2获取数据

参考

https://blog.csdn.net/afei__/article/details/92102775

https://blog.csdn.net/ganfanzhou/article/details/83721750

https://blog.csdn.net/afei__/article/details/92102775

https://blog.csdn.net/tong5956/article/details/82688886

https://blog.csdn.net/qq_31939617/article/details/86492025

概念：

ImageReader 通过这个类进行读取码流。具体流程如下：

步骤一：新建ImageReader类，设置回调摄像机分辨率，以及回调图像格式

        mPreviewImageReader = ImageReader.newInstance(1280,720,ImageFormat.YUV_420_888,2);

步骤二：设置数据回调

mPreviewImageReader.setOnImageAvailableListener(videoCallback,null);

    ImageReader.OnImageAvailableListener videoCallback = new ImageReader.OnImageAvailableListener() {        @Override        public void onImageAvailable(ImageReader reader) {            Image image = reader.acquireNextImage();            Log.i(tag,"image format: " +image.getHeight()+" "+image.getWidth());            Image.Plane[] planes = image.getPlanes();            int n_image_size = image.getWidth()*image.getHeight()*3/2;            image.close();        }    };

步骤三：添加到预览里面

    private void takePreview() {        try {            // 创建CameraCaptureSession，该对象负责管理处理预览请求和拍照请求            mCameraDevice.createCaptureSession(Arrays.asList(mSurfaceHolder.getSurface(),mPreviewImageReader.getSurface()), new CameraCaptureSession.StateCallback() // ③            {                @Override                public void onConfigured(CameraCaptureSession cameraCaptureSession) {                    if (null == mCameraDevice) return;                    // 当摄像头已经准备好时，开始显示预览                    mCameraCaptureSession = cameraCaptureSession;                    try {                        // 创建预览需要的CaptureRequest.Builder                        final CaptureRequest.Builder previewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);                        // 将SurfaceView的surface作为CaptureRequest.Builder的目标                        previewRequestBuilder.addTarget(mSurfaceHolder.getSurface());                        previewRequestBuilder.addTarget(mPreviewImageReader.getSurface());                        // 自动对焦                        previewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);                        // 打开闪光灯                        previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);                        // 显示预览                        CaptureRequest previewRequest = previewRequestBuilder.build();                        mCameraCaptureSession.setRepeatingRequest(previewRequest, null, null);                    } catch (CameraAccessException e) {                        e.printStackTrace();                    }                }                @Override                public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {                    Toast.makeText(FaceActivity.this, "配置失败", Toast.LENGTH_SHORT).show();                }            }, null);        } catch (CameraAccessException e) {            e.printStackTrace();        }    }

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