1 /*
2  * Copyright (C) 2015 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.internal.os;
17 
18 import android.os.BatteryStats;
19 
20 /**
21  * Power calculator for the camera subsystem, excluding the flashlight.
22  *
23  * Note: Power draw for the flash unit should be included in the FlashlightPowerCalculator.
24  */
25 public class CameraPowerCalculator extends PowerCalculator {
26     private final double mCameraPowerOnAvg;
27 
CameraPowerCalculator(PowerProfile profile)28     public CameraPowerCalculator(PowerProfile profile) {
29         mCameraPowerOnAvg = profile.getAveragePower(PowerProfile.POWER_CAMERA);
30     }
31 
32     @Override
calculateApp(BatterySipper app, BatteryStats.Uid u, long rawRealtimeUs, long rawUptimeUs, int statsType)33     public void calculateApp(BatterySipper app, BatteryStats.Uid u, long rawRealtimeUs,
34                              long rawUptimeUs, int statsType) {
35 
36         // Calculate camera power usage.  Right now, this is a (very) rough estimate based on the
37         // average power usage for a typical camera application.
38         final BatteryStats.Timer timer = u.getCameraTurnedOnTimer();
39         if (timer != null) {
40             final long totalTime = timer.getTotalTimeLocked(rawRealtimeUs, statsType) / 1000;
41             app.cameraTimeMs = totalTime;
42             app.cameraPowerMah = (totalTime * mCameraPowerOnAvg) / (1000*60*60);
43         } else {
44             app.cameraTimeMs = 0;
45             app.cameraPowerMah = 0;
46         }
47     }
48 }
49