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.BatteryConsumer; 19 import android.os.BatteryStats; 20 import android.os.BatteryUsageStats; 21 import android.os.BatteryUsageStatsQuery; 22 import android.os.UidBatteryConsumer; 23 24 /** 25 * Power calculator for the camera subsystem, excluding the flashlight. 26 * 27 * Note: Power draw for the flash unit should be included in the FlashlightPowerCalculator. 28 */ 29 public class CameraPowerCalculator extends PowerCalculator { 30 // Calculate camera power usage. Right now, this is a (very) rough estimate based on the 31 // average power usage for a typical camera application. 32 private final UsageBasedPowerEstimator mPowerEstimator; 33 CameraPowerCalculator(PowerProfile profile)34 public CameraPowerCalculator(PowerProfile profile) { 35 mPowerEstimator = new UsageBasedPowerEstimator( 36 profile.getAveragePower(PowerProfile.POWER_CAMERA)); 37 } 38 39 @Override isPowerComponentSupported(@atteryConsumer.PowerComponent int powerComponent)40 public boolean isPowerComponentSupported(@BatteryConsumer.PowerComponent int powerComponent) { 41 return powerComponent == BatteryConsumer.POWER_COMPONENT_CAMERA; 42 } 43 44 @Override calculate(BatteryUsageStats.Builder builder, BatteryStats batteryStats, long rawRealtimeUs, long rawUptimeUs, BatteryUsageStatsQuery query)45 public void calculate(BatteryUsageStats.Builder builder, BatteryStats batteryStats, 46 long rawRealtimeUs, long rawUptimeUs, BatteryUsageStatsQuery query) { 47 super.calculate(builder, batteryStats, rawRealtimeUs, rawUptimeUs, query); 48 49 final long durationMs = batteryStats.getCameraOnTime(rawRealtimeUs, 50 BatteryStats.STATS_SINCE_CHARGED) / 1000; 51 final double powerMah = mPowerEstimator.calculatePower(durationMs); 52 builder.getAggregateBatteryConsumerBuilder( 53 BatteryUsageStats.AGGREGATE_BATTERY_CONSUMER_SCOPE_DEVICE) 54 .setUsageDurationMillis(BatteryConsumer.POWER_COMPONENT_CAMERA, durationMs) 55 .setConsumedPower(BatteryConsumer.POWER_COMPONENT_CAMERA, powerMah); 56 builder.getAggregateBatteryConsumerBuilder( 57 BatteryUsageStats.AGGREGATE_BATTERY_CONSUMER_SCOPE_ALL_APPS) 58 .setUsageDurationMillis(BatteryConsumer.POWER_COMPONENT_CAMERA, durationMs) 59 .setConsumedPower(BatteryConsumer.POWER_COMPONENT_CAMERA, powerMah); 60 } 61 62 @Override calculateApp(UidBatteryConsumer.Builder app, BatteryStats.Uid u, long rawRealtimeUs, long rawUptimeUs, BatteryUsageStatsQuery query)63 protected void calculateApp(UidBatteryConsumer.Builder app, BatteryStats.Uid u, 64 long rawRealtimeUs, long rawUptimeUs, BatteryUsageStatsQuery query) { 65 final long durationMs = 66 mPowerEstimator.calculateDuration(u.getCameraTurnedOnTimer(), rawRealtimeUs, 67 BatteryStats.STATS_SINCE_CHARGED); 68 final double powerMah = mPowerEstimator.calculatePower(durationMs); 69 app.setUsageDurationMillis(BatteryConsumer.POWER_COMPONENT_CAMERA, durationMs) 70 .setConsumedPower(BatteryConsumer.POWER_COMPONENT_CAMERA, powerMah); 71 } 72 } 73