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      1 /*
      2  * Copyright (C) 2014 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 
     17 package com.android.incallui;
     18 
     19 import android.content.Context;
     20 import android.graphics.SurfaceTexture;
     21 import android.hardware.camera2.CameraAccessException;
     22 import android.hardware.camera2.CameraCharacteristics;
     23 import android.hardware.camera2.CameraManager;
     24 import android.hardware.camera2.params.StreamConfigurationMap;
     25 import android.util.Size;
     26 
     27 import java.lang.String;
     28 import java.util.Collections;
     29 import java.util.concurrent.ConcurrentHashMap;
     30 import java.util.Set;
     31 
     32 /**
     33  * Used to track which camera is used for outgoing video.
     34  */
     35 public class InCallCameraManager {
     36 
     37     public interface Listener {
     38         void onActiveCameraSelectionChanged(boolean isUsingFrontFacingCamera);
     39     }
     40 
     41     private final Set<Listener> mCameraSelectionListeners = Collections.
     42         newSetFromMap(new ConcurrentHashMap<Listener, Boolean>(8,0.9f,1));
     43 
     44     /**
     45      * The camera ID for the front facing camera.
     46      */
     47     private String mFrontFacingCameraId;
     48 
     49     /**
     50      * The camera ID for the rear facing camera.
     51      */
     52     private String mRearFacingCameraId;
     53 
     54     /**
     55      * The currently active camera.
     56      */
     57     private boolean mUseFrontFacingCamera;
     58 
     59     /**
     60      * Indicates whether the list of cameras has been initialized yet.  Initialization is delayed
     61      * until a video call is present.
     62      */
     63     private boolean mIsInitialized = false;
     64 
     65     /**
     66      * The context.
     67      */
     68     private Context mContext;
     69 
     70     /**
     71      * Initializes the InCall CameraManager.
     72      *
     73      * @param context The current context.
     74      */
     75     public InCallCameraManager(Context context) {
     76         mUseFrontFacingCamera = true;
     77         mContext = context;
     78     }
     79 
     80     /**
     81      * Sets whether the front facing camera should be used or not.
     82      *
     83      * @param useFrontFacingCamera {@code True} if the front facing camera is to be used.
     84      */
     85     public void setUseFrontFacingCamera(boolean useFrontFacingCamera) {
     86         mUseFrontFacingCamera = useFrontFacingCamera;
     87         for (Listener listener : mCameraSelectionListeners) {
     88             listener.onActiveCameraSelectionChanged(mUseFrontFacingCamera);
     89         }
     90     }
     91 
     92     /**
     93      * Determines whether the front facing camera is currently in use.
     94      *
     95      * @return {@code True} if the front facing camera is in use.
     96      */
     97     public boolean isUsingFrontFacingCamera() {
     98         return mUseFrontFacingCamera;
     99     }
    100 
    101     /**
    102      * Determines the active camera ID.
    103      *
    104      * @return The active camera ID.
    105      */
    106     public String getActiveCameraId() {
    107         maybeInitializeCameraList(mContext);
    108 
    109         if (mUseFrontFacingCamera) {
    110             return mFrontFacingCameraId;
    111         } else {
    112             return mRearFacingCameraId;
    113         }
    114     }
    115 
    116     /**
    117      * Get the list of cameras available for use.
    118      *
    119      * @param context The context.
    120      */
    121     private void maybeInitializeCameraList(Context context) {
    122         if (mIsInitialized || context == null) {
    123             return;
    124         }
    125 
    126         Log.v(this, "initializeCameraList");
    127 
    128         CameraManager cameraManager = null;
    129         try {
    130             cameraManager = (CameraManager) context.getSystemService(
    131                     Context.CAMERA_SERVICE);
    132         } catch (Exception e) {
    133             Log.e(this, "Could not get camera service.");
    134             return;
    135         }
    136 
    137         if (cameraManager == null) {
    138             return;
    139         }
    140 
    141         String[] cameraIds = {};
    142         try {
    143             cameraIds = cameraManager.getCameraIdList();
    144         } catch (CameraAccessException e) {
    145             Log.d(this, "Could not access camera: "+e);
    146             // Camera disabled by device policy.
    147             return;
    148         }
    149 
    150         for (int i = 0; i < cameraIds.length; i++) {
    151             CameraCharacteristics c = null;
    152             try {
    153                 c = cameraManager.getCameraCharacteristics(cameraIds[i]);
    154             } catch (IllegalArgumentException e) {
    155                 // Device Id is unknown.
    156             } catch (CameraAccessException e) {
    157                 // Camera disabled by device policy.
    158             }
    159             if (c != null) {
    160                 int facingCharacteristic = c.get(CameraCharacteristics.LENS_FACING);
    161                 if (facingCharacteristic == CameraCharacteristics.LENS_FACING_FRONT) {
    162                     mFrontFacingCameraId = cameraIds[i];
    163                 } else if (facingCharacteristic == CameraCharacteristics.LENS_FACING_BACK) {
    164                     mRearFacingCameraId = cameraIds[i];
    165                 }
    166             }
    167         }
    168 
    169         mIsInitialized = true;
    170         Log.v(this, "initializeCameraList : done");
    171     }
    172 
    173     public void addCameraSelectionListener(Listener listener) {
    174         if (listener != null) {
    175             mCameraSelectionListeners.add(listener);
    176         }
    177     }
    178 
    179     public void removeCameraSelectionListener(Listener listener) {
    180         if (listener != null) {
    181             mCameraSelectionListeners.remove(listener);
    182         }
    183     }
    184 }
    185