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 28 public CameraPowerCalculator(PowerProfile profile) { 29 mCameraPowerOnAvg = profile.getAveragePower(PowerProfile.POWER_CAMERA); 30 } 31 32 @Override 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
