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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.cts.verifier.sensors;
     17 
     18 // ----------------------------------------------------------------------
     19 
     20 import android.content.Context;
     21 import android.hardware.Camera;
     22 import android.util.AttributeSet;
     23 import android.util.Log;
     24 import android.view.SurfaceHolder;
     25 import android.view.SurfaceView;
     26 import android.view.ViewGroup;
     27 
     28 import java.io.IOException;
     29 import java.lang.Math;
     30 
     31 import com.android.cts.verifier.sensors.RVCVRecordActivity;
     32 import com.android.cts.verifier.sensors.RVCVRecordActivity.RecordProcedureControllerCallback;
     33 
     34 /** Camera preview class */
     35 public class RVCVCameraPreview extends SurfaceView implements SurfaceHolder.Callback {
     36     private static final String TAG = "RVCVCameraPreview";
     37     private static final boolean LOCAL_LOGD = true;
     38 
     39     private SurfaceHolder mHolder;
     40     private Camera mCamera;
     41     private float mAspect;
     42     private int mRotation;
     43     private boolean mCheckStartTest = false;
     44     private boolean mPreviewStarted = false;
     45 
     46     private RVCVRecordActivity.RecordProcedureControllerCallback mRecordProcedureControllerCallback;
     47 
     48     /**
     49      * Constructor
     50      * @param context Activity context
     51      */
     52     public RVCVCameraPreview(Context context) {
     53         super(context);
     54         mCamera = null;
     55         initSurface();
     56     }
     57 
     58     /**
     59      * Constructor
     60      * @param context Activity context
     61      * @param attrs
     62      */
     63     public RVCVCameraPreview(Context context, AttributeSet attrs) {
     64         super(context, attrs);
     65     }
     66 
     67     public void init(Camera camera, float aspectRatio, int rotation)  {
     68         this.mCamera = camera;
     69         mAspect = aspectRatio;
     70         mRotation = rotation;
     71         initSurface();
     72     }
     73 
     74     private void initSurface() {
     75         // Install a SurfaceHolder.Callback so we get notified when the
     76         // underlying surface is created and destroyed.
     77         mHolder = getHolder();
     78         mHolder.addCallback(this);
     79 
     80         // deprecated
     81         // TODO: update this code to match new API level.
     82         mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
     83     }
     84 
     85     /**
     86      *  SurfaceHolder.Callback
     87      *  Surface is created, it is OK to start the camera preview now.
     88      */
     89     public void surfaceCreated(SurfaceHolder holder) {
     90         // The Surface has been created, now tell the camera where to draw the preview.
     91 
     92         if (mCamera == null) {
     93             // preview camera does not exist
     94             return;
     95         }
     96     }
     97     /**
     98      *  SurfaceHolder.Callback
     99      */
    100     public void surfaceDestroyed(SurfaceHolder holder) {
    101         // empty. Take care of releasing the Camera preview in your activity.
    102     }
    103 
    104     /**
    105      *  SurfaceHolder.Callback
    106      *  Restart camera preview if surface changed
    107      */
    108     public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    109 
    110         if (mHolder.getSurface() == null || mCamera == null){
    111             // preview surface or camera does not exist
    112             return;
    113         }
    114         if (adjustLayoutParamsIfNeeded()) {
    115             // Wait on next surfaceChanged() call before proceeding
    116             Log.d(TAG, "Waiting on surface change before starting preview");
    117             return;
    118         }
    119 
    120         if (mPreviewStarted) {
    121             Log.w(TAG, "Re-starting camera preview");
    122             if (mCheckStartTest && mRecordProcedureControllerCallback != null) {
    123                 mRecordProcedureControllerCallback.stopRecordProcedureController();
    124             }
    125             mCamera.stopPreview();
    126             mPreviewStarted = false;
    127         }
    128         mCheckStartTest = false;
    129 
    130         mCamera.setDisplayOrientation(mRotation);
    131         try {
    132             mCamera.setPreviewDisplay(holder);
    133             mCamera.startPreview();
    134             mPreviewStarted = true;
    135             if (mRecordProcedureControllerCallback != null) {
    136                 mCheckStartTest = true;
    137                 mRecordProcedureControllerCallback.startRecordProcedureController();
    138             }
    139         } catch (IOException e) {
    140             if (LOCAL_LOGD) Log.d(TAG, "Error when starting camera preview: " + e.getMessage());
    141         }
    142     }
    143 
    144     /**
    145      * Resize the layout to more closely match the desired aspect ratio, if necessary.
    146      *
    147      * @return true if we updated the layout params, false if the params look good
    148      */
    149     private boolean adjustLayoutParamsIfNeeded() {
    150         ViewGroup.LayoutParams layoutParams = getLayoutParams();
    151         int curWidth = getWidth();
    152         int curHeight = getHeight();
    153         float curAspect = (float)curHeight / (float)curWidth;
    154         float aspectDelta = Math.abs(mAspect - curAspect);
    155         if ((aspectDelta / mAspect) >= 0.01) {
    156             if (curAspect > mAspect) {
    157                 layoutParams.height = (int)Math.round(curWidth * mAspect);
    158                 layoutParams.width = curWidth;
    159             } else {
    160                 layoutParams.height = curHeight;
    161                 layoutParams.width = (int)Math.round(curHeight / mAspect);
    162             }
    163 
    164             if (layoutParams.height != curHeight || layoutParams.width != curWidth) {
    165                 Log.d(TAG, String.format("Layout (%d, %d) -> (%d, %d)", curWidth, curHeight,
    166                         layoutParams.width, layoutParams.height));
    167                 setLayoutParams(layoutParams);
    168                 return true;
    169             }
    170         }
    171         return false;
    172     }
    173 
    174     public void setRecordProcedureControllerCallback(
    175             RVCVRecordActivity.RecordProcedureControllerCallback callback) {
    176         mRecordProcedureControllerCallback = callback;
    177     }
    178 }
    179