services/camera/libcameraservice/CameraService.cpp

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "CameraService"
//#define LOG_NDEBUG 0

#include <algorithm>
#include <climits>
#include <stdio.h>
#include <cstring>
#include <ctime>
#include <string>
#include <sys/types.h>
#include <inttypes.h>
#include <pthread.h>

#include <binder/AppOpsManager.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/MemoryBase.h>
#include <binder/MemoryHeapBase.h>
#include <binder/ProcessInfoService.h>
#include <cutils/atomic.h>
#include <cutils/properties.h>
#include <gui/Surface.h>
#include <hardware/hardware.h>
#include <media/AudioSystem.h>
#include <media/IMediaHTTPService.h>
#include <media/mediaplayer.h>
#include <utils/Errors.h>
#include <utils/Log.h>
#include <utils/String16.h>
#include <utils/Trace.h>
#include <system/camera_vendor_tags.h>
#include <system/camera_metadata.h>
#include <system/camera.h>

#include "CameraService.h"
#include "api1/CameraClient.h"
#include "api1/Camera2Client.h"
#include "api2/CameraDeviceClient.h"
#include "utils/CameraTraces.h"
#include "CameraDeviceFactory.h"

namespace android {

// ----------------------------------------------------------------------------
// Logging support -- this is for debugging only
// Use "adb shell dumpsys media.camera -v 1" to change it.
volatile int32_t gLogLevel = 0;

#define LOG1(...) ALOGD_IF(gLogLevel >= 1, __VA_ARGS__);
#define LOG2(...) ALOGD_IF(gLogLevel >= 2, __VA_ARGS__);

static void setLogLevel(int level) {
    android_atomic_write(level, &gLogLevel);
}

// ----------------------------------------------------------------------------

extern "C" {
static void camera_device_status_change(
        const struct camera_module_callbacks* callbacks,
        int camera_id,
        int new_status) {
    sp<CameraService> cs = const_cast<CameraService*>(
            static_cast<const CameraService*>(callbacks));

    cs->onDeviceStatusChanged(static_cast<camera_device_status_t>(camera_id),
            static_cast<camera_device_status_t>(new_status));
}

static void torch_mode_status_change(
        const struct camera_module_callbacks* callbacks,
        const char* camera_id,
        int new_status) {
    if (!callbacks || !camera_id) {
        ALOGE("%s invalid parameters. callbacks %p, camera_id %p", __FUNCTION__,
                callbacks, camera_id);
    }
    sp<CameraService> cs = const_cast<CameraService*>(
                                static_cast<const CameraService*>(callbacks));

    ICameraServiceListener::TorchStatus status;
    switch (new_status) {
        case TORCH_MODE_STATUS_NOT_AVAILABLE:
            status = ICameraServiceListener::TORCH_STATUS_NOT_AVAILABLE;
            break;
        case TORCH_MODE_STATUS_AVAILABLE_OFF:
            status = ICameraServiceListener::TORCH_STATUS_AVAILABLE_OFF;
            break;
        case TORCH_MODE_STATUS_AVAILABLE_ON:
            status = ICameraServiceListener::TORCH_STATUS_AVAILABLE_ON;
            break;
        default:
            ALOGE("Unknown torch status %d", new_status);
            return;
    }

    cs->onTorchStatusChanged(
        String8(camera_id),
        status);
}
} // extern "C"

// ----------------------------------------------------------------------------

// This is ugly and only safe if we never re-create the CameraService, but
// should be ok for now.
static CameraService *gCameraService;

CameraService::CameraService() : mEventLog(DEFAULT_EVENT_LOG_LENGTH),
        mLastUserId(DEFAULT_LAST_USER_ID), mSoundRef(0), mModule(0), mFlashlight(0) {
    ALOGI("CameraService started (pid=%d)", getpid());
    gCameraService = this;

    this->camera_device_status_change = android::camera_device_status_change;
    this->torch_mode_status_change = android::torch_mode_status_change;

    mServiceLockWrapper = std::make_shared<WaitableMutexWrapper>(&mServiceLock);
}

void CameraService::onFirstRef()
{
    ALOGI("CameraService process starting");

    BnCameraService::onFirstRef();

    camera_module_t *rawModule;
    if (hw_get_module(CAMERA_HARDWARE_MODULE_ID,
                (const hw_module_t **)&rawModule) < 0) {
        ALOGE("Could not load camera HAL module");
        mNumberOfCameras = 0;
    }
    else {
        mModule = new CameraModule(rawModule);
        ALOGI("Loaded \"%s\" camera module", mModule->getModuleName());
        mNumberOfCameras = mModule->getNumberOfCameras();

        mFlashlight = new CameraFlashlight(*mModule, *this);
        status_t res = mFlashlight->findFlashUnits();
        if (res) {
            // impossible because we haven't open any camera devices.
            ALOGE("Failed to find flash units.");
        }

        for (int i = 0; i < mNumberOfCameras; i++) {
            String8 cameraId = String8::format("%d", i);

            // Defaults to use for cost and conflicting devices
            int cost = 100;
            char** conflicting_devices = nullptr;
            size_t conflicting_devices_length = 0;

            // If using post-2.4 module version, query the cost + conflicting devices from the HAL
            if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_4) {
                struct camera_info info;
                status_t rc = mModule->getCameraInfo(i, &info);
                if (rc == NO_ERROR) {
                    cost = info.resource_cost;
                    conflicting_devices = info.conflicting_devices;
                    conflicting_devices_length = info.conflicting_devices_length;
                } else {
                    ALOGE("%s: Received error loading camera info for device %d, cost and"
                            " conflicting devices fields set to defaults for this device.",
                            __FUNCTION__, i);
                }
            }

            std::set<String8> conflicting;
            for (size_t i = 0; i < conflicting_devices_length; i++) {
                conflicting.emplace(String8(conflicting_devices[i]));
            }

            // Initialize state for each camera device
            {
                Mutex::Autolock lock(mCameraStatesLock);
                mCameraStates.emplace(cameraId, std::make_shared<CameraState>(cameraId, cost,
                        conflicting));
            }

            if (mFlashlight->hasFlashUnit(cameraId)) {
                mTorchStatusMap.add(cameraId,
                        ICameraServiceListener::TORCH_STATUS_AVAILABLE_OFF);
            }
        }

        if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_1) {
            mModule->setCallbacks(this);
        }

        VendorTagDescriptor::clearGlobalVendorTagDescriptor();

        if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_2) {
            setUpVendorTags();
        }

        CameraDeviceFactory::registerService(this);
    }
}

CameraService::~CameraService() {
    if (mModule) {
        delete mModule;
        mModule = nullptr;
    }
    VendorTagDescriptor::clearGlobalVendorTagDescriptor();
    gCameraService = nullptr;
}

void CameraService::onDeviceStatusChanged(camera_device_status_t  cameraId,
        camera_device_status_t newStatus) {
    ALOGI("%s: Status changed for cameraId=%d, newStatus=%d", __FUNCTION__,
          cameraId, newStatus);

    String8 id = String8::format("%d", cameraId);
    std::shared_ptr<CameraState> state = getCameraState(id);

    if (state == nullptr) {
        ALOGE("%s: Bad camera ID %d", __FUNCTION__, cameraId);
        return;
    }

    ICameraServiceListener::Status oldStatus = state->getStatus();

    if (oldStatus == static_cast<ICameraServiceListener::Status>(newStatus)) {
        ALOGE("%s: State transition to the same status %#x not allowed", __FUNCTION__, newStatus);
        return;
    }

    if (newStatus == CAMERA_DEVICE_STATUS_NOT_PRESENT) {
        logDeviceRemoved(id, String8::format("Device status changed from %d to %d", oldStatus,
                newStatus));
        sp<BasicClient> clientToDisconnect;
        {
            // Don't do this in updateStatus to avoid deadlock over mServiceLock
            Mutex::Autolock lock(mServiceLock);

            // Set the device status to NOT_PRESENT, clients will no longer be able to connect
            // to this device until the status changes
            updateStatus(ICameraServiceListener::STATUS_NOT_PRESENT, id);

            // Remove cached shim parameters
            state->setShimParams(CameraParameters());

            // Remove the client from the list of active clients
            clientToDisconnect = removeClientLocked(id);

            // Notify the client of disconnection
            clientToDisconnect->notifyError(ICameraDeviceCallbacks::ERROR_CAMERA_DISCONNECTED,
                    CaptureResultExtras{});
        }

        ALOGI("%s: Client for camera ID %s evicted due to device status change from HAL",
                __FUNCTION__, id.string());

        // Disconnect client
        if (clientToDisconnect.get() != nullptr) {
            // Ensure not in binder RPC so client disconnect PID checks work correctly
            LOG_ALWAYS_FATAL_IF(getCallingPid() != getpid(),
                    "onDeviceStatusChanged must be called from the camera service process!");
            clientToDisconnect->disconnect();
        }

    } else {
        if (oldStatus == ICameraServiceListener::Status::STATUS_NOT_PRESENT) {
            logDeviceAdded(id, String8::format("Device status changed from %d to %d", oldStatus,
                    newStatus));
        }
        updateStatus(static_cast<ICameraServiceListener::Status>(newStatus), id);
    }

}

void CameraService::onTorchStatusChanged(const String8& cameraId,
        ICameraServiceListener::TorchStatus newStatus) {
    Mutex::Autolock al(mTorchStatusMutex);
    onTorchStatusChangedLocked(cameraId, newStatus);
}

void CameraService::onTorchStatusChangedLocked(const String8& cameraId,
        ICameraServiceListener::TorchStatus newStatus) {
    ALOGI("%s: Torch status changed for cameraId=%s, newStatus=%d",
            __FUNCTION__, cameraId.string(), newStatus);

    ICameraServiceListener::TorchStatus status;
    status_t res = getTorchStatusLocked(cameraId, &status);
    if (res) {
        ALOGE("%s: cannot get torch status of camera %s", cameraId.string());
        return;
    }
    if (status == newStatus) {
        ALOGE("%s: Torch state transition to the same status 0x%x not allowed",
              __FUNCTION__, (uint32_t)newStatus);
        return;
    }

    res = setTorchStatusLocked(cameraId, newStatus);
    if (res) {
        ALOGE("%s: Failed to set the torch status", __FUNCTION__,
                (uint32_t)newStatus);
        return;
    }

    {
        Mutex::Autolock lock(mStatusListenerLock);
        for (auto& i : mListenerList) {
            i->onTorchStatusChanged(newStatus, String16{cameraId});
        }
    }
}


int32_t CameraService::getNumberOfCameras() {
    return mNumberOfCameras;
}

status_t CameraService::getCameraInfo(int cameraId,
                                      struct CameraInfo* cameraInfo) {
    if (!mModule) {
        return -ENODEV;
    }

    if (cameraId < 0 || cameraId >= mNumberOfCameras) {
        return BAD_VALUE;
    }

    struct camera_info info;
    status_t rc = filterGetInfoErrorCode(
        mModule->getCameraInfo(cameraId, &info));
    cameraInfo->facing = info.facing;
    cameraInfo->orientation = info.orientation;
    return rc;
}

int CameraService::cameraIdToInt(const String8& cameraId) {
    errno = 0;
    size_t pos = 0;
    int ret = stoi(std::string{cameraId.string()}, &pos);
    if (errno != 0 || pos != cameraId.size()) {
        return -1;
    }
    return ret;
}

status_t CameraService::generateShimMetadata(int cameraId, /*out*/CameraMetadata* cameraInfo) {
    status_t ret = OK;
    struct CameraInfo info;
    if ((ret = getCameraInfo(cameraId, &info)) != OK) {
        return ret;
    }

    CameraMetadata shimInfo;
    int32_t orientation = static_cast<int32_t>(info.orientation);
    if ((ret = shimInfo.update(ANDROID_SENSOR_ORIENTATION, &orientation, 1)) != OK) {
        return ret;
    }

    uint8_t facing = (info.facing == CAMERA_FACING_FRONT) ?
            ANDROID_LENS_FACING_FRONT : ANDROID_LENS_FACING_BACK;
    if ((ret = shimInfo.update(ANDROID_LENS_FACING, &facing, 1)) != OK) {
        return ret;
    }

    CameraParameters shimParams;
    if ((ret = getLegacyParametersLazy(cameraId, /*out*/&shimParams)) != OK) {
        // Error logged by callee
        return ret;
    }

    Vector<Size> sizes;
    Vector<Size> jpegSizes;
    Vector<int32_t> formats;
    const char* supportedPreviewFormats;
    {
        shimParams.getSupportedPreviewSizes(/*out*/sizes);
        shimParams.getSupportedPreviewFormats(/*out*/formats);
        shimParams.getSupportedPictureSizes(/*out*/jpegSizes);
    }

    // Always include IMPLEMENTATION_DEFINED
    formats.add(HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED);

    const size_t INTS_PER_CONFIG = 4;

    // Build available stream configurations metadata
    size_t streamConfigSize = (sizes.size() * formats.size() + jpegSizes.size()) * INTS_PER_CONFIG;

    Vector<int32_t> streamConfigs;
    streamConfigs.setCapacity(streamConfigSize);

    for (size_t i = 0; i < formats.size(); ++i) {
        for (size_t j = 0; j < sizes.size(); ++j) {
            streamConfigs.add(formats[i]);
            streamConfigs.add(sizes[j].width);
            streamConfigs.add(sizes[j].height);
            streamConfigs.add(ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT);
        }
    }

    for (size_t i = 0; i < jpegSizes.size(); ++i) {
        streamConfigs.add(HAL_PIXEL_FORMAT_BLOB);
        streamConfigs.add(jpegSizes[i].width);
        streamConfigs.add(jpegSizes[i].height);
        streamConfigs.add(ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT);
    }

    if ((ret = shimInfo.update(ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS,
            streamConfigs.array(), streamConfigSize)) != OK) {
        return ret;
    }

    int64_t fakeMinFrames[0];
    // TODO: Fixme, don't fake min frame durations.
    if ((ret = shimInfo.update(ANDROID_SCALER_AVAILABLE_MIN_FRAME_DURATIONS,
            fakeMinFrames, 0)) != OK) {
        return ret;
    }

    int64_t fakeStalls[0];
    // TODO: Fixme, don't fake stall durations.
    if ((ret = shimInfo.update(ANDROID_SCALER_AVAILABLE_STALL_DURATIONS,
            fakeStalls, 0)) != OK) {
        return ret;
    }

    *cameraInfo = shimInfo;
    return OK;
}

status_t CameraService::getCameraCharacteristics(int cameraId,
                                                CameraMetadata* cameraInfo) {
    if (!cameraInfo) {
        ALOGE("%s: cameraInfo is NULL", __FUNCTION__);
        return BAD_VALUE;
    }

    if (!mModule) {
        ALOGE("%s: camera hardware module doesn't exist", __FUNCTION__);
        return -ENODEV;
    }

    if (cameraId < 0 || cameraId >= mNumberOfCameras) {
        ALOGE("%s: Invalid camera id: %d", __FUNCTION__, cameraId);
        return BAD_VALUE;
    }

    int facing;
    status_t ret = OK;
    if (mModule->getModuleApiVersion() < CAMERA_MODULE_API_VERSION_2_0 ||
            getDeviceVersion(cameraId, &facing) <= CAMERA_DEVICE_API_VERSION_2_1 ) {
        /**
         * Backwards compatibility mode for old HALs:
         * - Convert CameraInfo into static CameraMetadata properties.
         * - Retrieve cached CameraParameters for this camera.  If none exist,
         *   attempt to open CameraClient and retrieve the CameraParameters.
         * - Convert cached CameraParameters into static CameraMetadata
         *   properties.
         */
        ALOGI("%s: Switching to HAL1 shim implementation...", __FUNCTION__);

        if ((ret = generateShimMetadata(cameraId, cameraInfo)) != OK) {
            return ret;
        }

    } else {
        /**
         * Normal HAL 2.1+ codepath.
         */
        struct camera_info info;
        ret = filterGetInfoErrorCode(mModule->getCameraInfo(cameraId, &info));
        *cameraInfo = info.static_camera_characteristics;
    }

    return ret;
}

int CameraService::getCallingPid() {
    return IPCThreadState::self()->getCallingPid();
}

int CameraService::getCallingUid() {
    return IPCThreadState::self()->getCallingUid();
}

String8 CameraService::getFormattedCurrentTime() {
    time_t now = time(nullptr);
    char formattedTime[64];
    strftime(formattedTime, sizeof(formattedTime), "%m-%d %H:%M:%S", localtime(&now));
    return String8(formattedTime);
}

int CameraService::getCameraPriorityFromProcState(int procState) {
    // Find the priority for the camera usage based on the process state.  Higher priority clients
    // win for evictions.
    // Note: Unlike the ordering for ActivityManager, persistent system processes will always lose
    //       the camera to the top/foreground applications.
    switch(procState) {
        case PROCESS_STATE_TOP: // User visible
            return 100;
        case PROCESS_STATE_IMPORTANT_FOREGROUND: // Foreground
            return 90;
        case PROCESS_STATE_PERSISTENT: // Persistent system services
        case PROCESS_STATE_PERSISTENT_UI:
            return 80;
        case PROCESS_STATE_IMPORTANT_BACKGROUND: // "Important" background processes
            return 70;
        case PROCESS_STATE_BACKUP: // Everything else
        case PROCESS_STATE_HEAVY_WEIGHT:
        case PROCESS_STATE_SERVICE:
        case PROCESS_STATE_RECEIVER:
        case PROCESS_STATE_HOME:
        case PROCESS_STATE_LAST_ACTIVITY:
        case PROCESS_STATE_CACHED_ACTIVITY:
        case PROCESS_STATE_CACHED_ACTIVITY_CLIENT:
        case PROCESS_STATE_CACHED_EMPTY:
            return 1;
        case PROCESS_STATE_NONEXISTENT:
            return -1;
        default:
            ALOGE("%s: Received unknown process state from ActivityManagerService!", __FUNCTION__);
            return -1;
    }
}

status_t CameraService::getCameraVendorTagDescriptor(/*out*/sp<VendorTagDescriptor>& desc) {
    if (!mModule) {
        ALOGE("%s: camera hardware module doesn't exist", __FUNCTION__);
        return -ENODEV;
    }

    desc = VendorTagDescriptor::getGlobalVendorTagDescriptor();
    return OK;
}

int CameraService::getDeviceVersion(int cameraId, int* facing) {
    struct camera_info info;
    if (mModule->getCameraInfo(cameraId, &info) != OK) {
        return -1;
    }

    int deviceVersion;
    if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_0) {
        deviceVersion = info.device_version;
    } else {
        deviceVersion = CAMERA_DEVICE_API_VERSION_1_0;
    }

    if (facing) {
        *facing = info.facing;
    }

    return deviceVersion;
}

status_t CameraService::filterGetInfoErrorCode(status_t err) {
    switch(err) {
        case NO_ERROR:
        case -EINVAL:
            return err;
        default:
            break;
    }
    return -ENODEV;
}

bool CameraService::setUpVendorTags() {
    vendor_tag_ops_t vOps = vendor_tag_ops_t();

    // Check if vendor operations have been implemented
    if (!mModule->isVendorTagDefined()) {
        ALOGI("%s: No vendor tags defined for this device.", __FUNCTION__);
        return false;
    }

    ATRACE_BEGIN("camera3->get_metadata_vendor_tag_ops");
    mModule->getVendorTagOps(&vOps);
    ATRACE_END();

    // Ensure all vendor operations are present
    if (vOps.get_tag_count == NULL || vOps.get_all_tags == NULL ||
            vOps.get_section_name == NULL || vOps.get_tag_name == NULL ||
            vOps.get_tag_type == NULL) {
        ALOGE("%s: Vendor tag operations not fully defined. Ignoring definitions."
               , __FUNCTION__);
        return false;
    }

    // Read all vendor tag definitions into a descriptor
    sp<VendorTagDescriptor> desc;
    status_t res;
    if ((res = VendorTagDescriptor::createDescriptorFromOps(&vOps, /*out*/desc))
            != OK) {
        ALOGE("%s: Could not generate descriptor from vendor tag operations,"
              "received error %s (%d). Camera clients will not be able to use"
              "vendor tags", __FUNCTION__, strerror(res), res);
        return false;
    }

    // Set the global descriptor to use with camera metadata
    VendorTagDescriptor::setAsGlobalVendorTagDescriptor(desc);
    return true;
}

status_t CameraService::makeClient(const sp<CameraService>& cameraService,
        const sp<IInterface>& cameraCb, const String16& packageName, const String8& cameraId,
        int facing, int clientPid, uid_t clientUid, int servicePid, bool legacyMode,
        int halVersion, int deviceVersion, apiLevel effectiveApiLevel,
        /*out*/sp<BasicClient>* client) {

    // TODO: Update CameraClients + HAL interface to use strings for Camera IDs
    int id = cameraIdToInt(cameraId);
    if (id == -1) {
        ALOGE("%s: Invalid camera ID %s, cannot convert to integer.", __FUNCTION__,
                cameraId.string());
        return BAD_VALUE;
    }

    if (halVersion < 0 || halVersion == deviceVersion) {
        // Default path: HAL version is unspecified by caller, create CameraClient
        // based on device version reported by the HAL.
        switch(deviceVersion) {
          case CAMERA_DEVICE_API_VERSION_1_0:
            if (effectiveApiLevel == API_1) {  // Camera1 API route
                sp<ICameraClient> tmp = static_cast<ICameraClient*>(cameraCb.get());
                *client = new CameraClient(cameraService, tmp, packageName, id, facing,
                        clientPid, clientUid, getpid(), legacyMode);
            } else { // Camera2 API route
                ALOGW("Camera using old HAL version: %d", deviceVersion);
                return -EOPNOTSUPP;
            }
            break;
          case CAMERA_DEVICE_API_VERSION_2_0:
          case CAMERA_DEVICE_API_VERSION_2_1:
          case CAMERA_DEVICE_API_VERSION_3_0:
          case CAMERA_DEVICE_API_VERSION_3_1:
          case CAMERA_DEVICE_API_VERSION_3_2:
          case CAMERA_DEVICE_API_VERSION_3_3:
            if (effectiveApiLevel == API_1) { // Camera1 API route
                sp<ICameraClient> tmp = static_cast<ICameraClient*>(cameraCb.get());
                *client = new Camera2Client(cameraService, tmp, packageName, id, facing,
                        clientPid, clientUid, servicePid, legacyMode);
            } else { // Camera2 API route
                sp<ICameraDeviceCallbacks> tmp =
                        static_cast<ICameraDeviceCallbacks*>(cameraCb.get());
                *client = new CameraDeviceClient(cameraService, tmp, packageName, id,
                        facing, clientPid, clientUid, servicePid);
            }
            break;
          default:
            // Should not be reachable
            ALOGE("Unknown camera device HAL version: %d", deviceVersion);
            return INVALID_OPERATION;
        }
    } else {
        // A particular HAL version is requested by caller. Create CameraClient
        // based on the requested HAL version.
        if (deviceVersion > CAMERA_DEVICE_API_VERSION_1_0 &&
            halVersion == CAMERA_DEVICE_API_VERSION_1_0) {
            // Only support higher HAL version device opened as HAL1.0 device.
            sp<ICameraClient> tmp = static_cast<ICameraClient*>(cameraCb.get());
            *client = new CameraClient(cameraService, tmp, packageName, id, facing,
                    clientPid, clientUid, servicePid, legacyMode);
        } else {
            // Other combinations (e.g. HAL3.x open as HAL2.x) are not supported yet.
            ALOGE("Invalid camera HAL version %x: HAL %x device can only be"
                    " opened as HAL %x device", halVersion, deviceVersion,
                    CAMERA_DEVICE_API_VERSION_1_0);
            return INVALID_OPERATION;
        }
    }
    return NO_ERROR;
}

status_t CameraService::initializeShimMetadata(int cameraId) {
    int uid = getCallingUid();

    String16 internalPackageName("media");
    String8 id = String8::format("%d", cameraId);
    status_t ret = NO_ERROR;
    sp<Client> tmp = nullptr;
    if ((ret = connectHelper<ICameraClient,Client>(sp<ICameraClient>{nullptr}, id,
            static_cast<int>(CAMERA_HAL_API_VERSION_UNSPECIFIED), internalPackageName, uid, API_1,
            false, true, tmp)) != NO_ERROR) {
        ALOGE("%s: Error %d (%s) initializing shim metadata.", __FUNCTION__, ret, strerror(ret));
        return ret;
    }
    return NO_ERROR;
}

status_t CameraService::getLegacyParametersLazy(int cameraId,
        /*out*/
        CameraParameters* parameters) {

    ALOGV("%s: for cameraId: %d", __FUNCTION__, cameraId);

    status_t ret = 0;

    if (parameters == NULL) {
        ALOGE("%s: parameters must not be null", __FUNCTION__);
        return BAD_VALUE;
    }

    String8 id = String8::format("%d", cameraId);

    // Check if we already have parameters
    {
        // Scope for service lock
        Mutex::Autolock lock(mServiceLock);
        auto cameraState = getCameraState(id);
        if (cameraState == nullptr) {
            ALOGE("%s: Invalid camera ID: %s", __FUNCTION__, id.string());
            return BAD_VALUE;
        }
        CameraParameters p = cameraState->getShimParams();
        if (!p.isEmpty()) {
            *parameters = p;
            return NO_ERROR;
        }
    }

    int64_t token = IPCThreadState::self()->clearCallingIdentity();
    ret = initializeShimMetadata(cameraId);
    IPCThreadState::self()->restoreCallingIdentity(token);
    if (ret != NO_ERROR) {
        // Error already logged by callee
        return ret;
    }

    // Check for parameters again
    {
        // Scope for service lock
        Mutex::Autolock lock(mServiceLock);
        auto cameraState = getCameraState(id);
        if (cameraState == nullptr) {
            ALOGE("%s: Invalid camera ID: %s", __FUNCTION__, id.string());
            return BAD_VALUE;
        }
        CameraParameters p = cameraState->getShimParams();
        if (!p.isEmpty()) {
            *parameters = p;
            return NO_ERROR;
        }
    }

    ALOGE("%s: Parameters were not initialized, or were empty.  Device may not be present.",
            __FUNCTION__);
    return INVALID_OPERATION;
}

status_t CameraService::validateConnectLocked(const String8& cameraId, /*inout*/int& clientUid)
        const {

    int callingPid = getCallingPid();

    if (clientUid == USE_CALLING_UID) {
        clientUid = getCallingUid();
    } else {
        // We only trust our own process to forward client UIDs
        if (callingPid != getpid()) {
            ALOGE("CameraService::connect X (PID %d) rejected (don't trust clientUid %d)",
                    callingPid, clientUid);
            return PERMISSION_DENIED;
        }
    }

    if (!mModule) {
        ALOGE("CameraService::connect X (PID %d) rejected (camera HAL module not loaded)",
                callingPid);
        return -ENODEV;
    }

    if (getCameraState(cameraId) == nullptr) {
        ALOGE("CameraService::connect X (PID %d) rejected (invalid camera ID %s)", callingPid,
                cameraId.string());
        return -ENODEV;
    }

    // Check device policy for this camera
    char value[PROPERTY_VALUE_MAX];
    char key[PROPERTY_KEY_MAX];
    int clientUserId = multiuser_get_user_id(clientUid);
    snprintf(key, PROPERTY_KEY_MAX, "sys.secpolicy.camera.off_%d", clientUserId);
    property_get(key, value, "0");
    if (strcmp(value, "1") == 0) {
        // Camera is disabled by DevicePolicyManager.
        ALOGE("CameraService::connect X (PID %d) rejected (camera %s is disabled by device "
                "policy)", callingPid, cameraId.string());
        return -EACCES;
    }

    // Only allow clients who are being used by the current foreground device user, unless calling
    // from our own process.
    if (callingPid != getpid() &&
            (mLastUserId != clientUserId && mLastUserId != DEFAULT_LAST_USER_ID)) {
        ALOGE("CameraService::connect X (PID %d) rejected (cannot connect from previous "
                "device user %d, current device user %d)", callingPid, clientUserId, mLastUserId);
        return PERMISSION_DENIED;
    }

    return checkIfDeviceIsUsable(cameraId);
}

status_t CameraService::checkIfDeviceIsUsable(const String8& cameraId) const {
    auto cameraState = getCameraState(cameraId);
    int callingPid = getCallingPid();
    if (cameraState == nullptr) {
        ALOGE("CameraService::connect X (PID %d) rejected (invalid camera ID %s)", callingPid,
                cameraId.string());
        return -ENODEV;
    }

    ICameraServiceListener::Status currentStatus = cameraState->getStatus();
    if (currentStatus == ICameraServiceListener::STATUS_NOT_PRESENT) {
        ALOGE("CameraService::connect X (PID %d) rejected (camera %s is not connected)",
                callingPid, cameraId.string());
        return -ENODEV;
    } else if (currentStatus == ICameraServiceListener::STATUS_ENUMERATING) {
        ALOGE("CameraService::connect X (PID %d) rejected, (camera %s is initializing)",
                callingPid, cameraId.string());
        return -EBUSY;
    }

    return NO_ERROR;
}

void CameraService::finishConnectLocked(const sp<BasicClient>& client,
        const CameraService::DescriptorPtr& desc) {

    // Make a descriptor for the incoming client
    auto clientDescriptor = CameraService::CameraClientManager::makeClientDescriptor(client, desc);
    auto evicted = mActiveClientManager.addAndEvict(clientDescriptor);

    logConnected(desc->getKey(), static_cast<int>(desc->getOwnerId()),
            String8(client->getPackageName()));

    if (evicted.size() > 0) {
        // This should never happen - clients should already have been removed in disconnect
        for (auto& i : evicted) {
            ALOGE("%s: Invalid state: Client for camera %s was not removed in disconnect",
                    __FUNCTION__, i->getKey().string());
        }

        LOG_ALWAYS_FATAL("%s: Invalid state for CameraService, clients not evicted properly",
                __FUNCTION__);
    }
}

status_t CameraService::handleEvictionsLocked(const String8& cameraId, int clientPid,
        apiLevel effectiveApiLevel, const sp<IBinder>& remoteCallback, const String8& packageName,
        /*out*/
        sp<BasicClient>* client,
        std::shared_ptr<resource_policy::ClientDescriptor<String8, sp<BasicClient>>>* partial) {

    status_t ret = NO_ERROR;
    std::vector<sp<BasicClient>> evictedClients;
    DescriptorPtr clientDescriptor;
    {
        if (effectiveApiLevel == API_1) {
            // If we are using API1, any existing client for this camera ID with the same remote
            // should be returned rather than evicted to allow MediaRecorder to work properly.

            auto current = mActiveClientManager.get(cameraId);
            if (current != nullptr) {
                auto clientSp = current->getValue();
                if (clientSp.get() != nullptr) { // should never be needed
                    if (clientSp->getRemote() == remoteCallback) {
                        ALOGI("CameraService::connect X (PID %d) (second call from same"
                                "app binder, returning the same client)", clientPid);
                        *client = clientSp;
                        return NO_ERROR;
                    }
                }
            }
        }

        // Return error if the device was unplugged or removed by the HAL for some reason
        if ((ret = checkIfDeviceIsUsable(cameraId)) != NO_ERROR) {
            return ret;
        }

        // Get current active client PIDs
        std::vector<int> ownerPids(mActiveClientManager.getAllOwners());
        ownerPids.push_back(clientPid);

        // Use the value +PROCESS_STATE_NONEXISTENT, to avoid taking
        // address of PROCESS_STATE_NONEXISTENT as a reference argument
        // for the vector constructor. PROCESS_STATE_NONEXISTENT does
        // not have an out-of-class definition.
        std::vector<int> priorities(ownerPids.size(), +PROCESS_STATE_NONEXISTENT);

        // Get priorites of all active PIDs
        ProcessInfoService::getProcessStatesFromPids(ownerPids.size(), &ownerPids[0],
                /*out*/&priorities[0]);

        // Update all active clients' priorities
        std::map<int,int> pidToPriorityMap;
        for (size_t i = 0; i < ownerPids.size() - 1; i++) {
            pidToPriorityMap.emplace(ownerPids[i], getCameraPriorityFromProcState(priorities[i]));
        }
        mActiveClientManager.updatePriorities(pidToPriorityMap);

        // Get state for the given cameraId
        auto state = getCameraState(cameraId);
        if (state == nullptr) {
            ALOGE("CameraService::connect X (PID %d) rejected (no camera device with ID %s)",
                clientPid, cameraId.string());
            return BAD_VALUE;
        }

        // Make descriptor for incoming client
        clientDescriptor = CameraClientManager::makeClientDescriptor(cameraId,
                sp<BasicClient>{nullptr}, static_cast<int32_t>(state->getCost()),
                state->getConflicting(),
                getCameraPriorityFromProcState(priorities[priorities.size() - 1]), clientPid);

        // Find clients that would be evicted
        auto evicted = mActiveClientManager.wouldEvict(clientDescriptor);

        // If the incoming client was 'evicted,' higher priority clients have the camera in the
        // background, so we cannot do evictions
        if (std::find(evicted.begin(), evicted.end(), clientDescriptor) != evicted.end()) {
            ALOGE("CameraService::connect X (PID %d) rejected (existing client(s) with higher"
                    " priority).", clientPid);

            sp<BasicClient> clientSp = clientDescriptor->getValue();
            String8 curTime = getFormattedCurrentTime();
            auto incompatibleClients =
                    mActiveClientManager.getIncompatibleClients(clientDescriptor);

            String8 msg = String8::format("%s : DENIED connect device %s client for package %s "
                    "(PID %d, priority %d) due to eviction policy", curTime.string(),
                    cameraId.string(), packageName.string(), clientPid,
                    getCameraPriorityFromProcState(priorities[priorities.size() - 1]));

            for (auto& i : incompatibleClients) {
                msg.appendFormat("\n   - Blocked by existing device %s client for package %s"
                        "(PID %" PRId32 ", priority %" PRId32 ")", i->getKey().string(),
                        String8{i->getValue()->getPackageName()}.string(), i->getOwnerId(),
                        i->getPriority());
            }

            // Log the client's attempt
            Mutex::Autolock l(mLogLock);
            mEventLog.add(msg);

            return -EBUSY;
        }

        for (auto& i : evicted) {
            sp<BasicClient> clientSp = i->getValue();
            if (clientSp.get() == nullptr) {
                ALOGE("%s: Invalid state: Null client in active client list.", __FUNCTION__);

                // TODO: Remove this
                LOG_ALWAYS_FATAL("%s: Invalid state for CameraService, null client in active list",
                        __FUNCTION__);
                mActiveClientManager.remove(i);
                continue;
            }

            ALOGE("CameraService::connect evicting conflicting client for camera ID %s",
                    i->getKey().string());
            evictedClients.push_back(clientSp);

            // Log the clients evicted
            logEvent(String8::format("EVICT device %s client held by package %s (PID"
                    " %" PRId32 ", priority %" PRId32 ")\n   - Evicted by device %s client for"
                    " package %s (PID %d, priority %" PRId32 ")",
                    i->getKey().string(), String8{clientSp->getPackageName()}.string(),
                    i->getOwnerId(), i->getPriority(), cameraId.string(),
                    packageName.string(), clientPid,
                    getCameraPriorityFromProcState(priorities[priorities.size() - 1])));

            // Notify the client of disconnection
            clientSp->notifyError(ICameraDeviceCallbacks::ERROR_CAMERA_DISCONNECTED,
                    CaptureResultExtras());
        }
    }

    // Do not hold mServiceLock while disconnecting clients, but retain the condition blocking
    // other clients from connecting in mServiceLockWrapper if held
    mServiceLock.unlock();

    // Clear caller identity temporarily so client disconnect PID checks work correctly
    int64_t token = IPCThreadState::self()->clearCallingIdentity();

    // Destroy evicted clients
    for (auto& i : evictedClients) {
        // Disconnect is blocking, and should only have returned when HAL has cleaned up
        i->disconnect(); // Clients will remove themselves from the active client list here
    }
    evictedClients.clear();

    IPCThreadState::self()->restoreCallingIdentity(token);

    // Once clients have been disconnected, relock
    mServiceLock.lock();

    // Check again if the device was unplugged or something while we weren't holding mServiceLock
    if ((ret = checkIfDeviceIsUsable(cameraId)) != NO_ERROR) {
        return ret;
    }

    *partial = clientDescriptor;
    return NO_ERROR;
}

status_t CameraService::connect(
        const sp<ICameraClient>& cameraClient,
        int cameraId,
        const String16& clientPackageName,
        int clientUid,
        /*out*/
        sp<ICamera>& device) {

    status_t ret = NO_ERROR;
    String8 id = String8::format("%d", cameraId);
    sp<Client> client = nullptr;
    ret = connectHelper<ICameraClient,Client>(cameraClient, id, CAMERA_HAL_API_VERSION_UNSPECIFIED,
            clientPackageName, clientUid, API_1, false, false, /*out*/client);

    if(ret != NO_ERROR) {
        logRejected(id, getCallingPid(), String8(clientPackageName),
                String8::format("%s (%d)", strerror(-ret), ret));
        return ret;
    }

    device = client;
    return NO_ERROR;
}

status_t CameraService::connectLegacy(
        const sp<ICameraClient>& cameraClient,
        int cameraId, int halVersion,
        const String16& clientPackageName,
        int clientUid,
        /*out*/
        sp<ICamera>& device) {

    String8 id = String8::format("%d", cameraId);
    int apiVersion = mModule->getModuleApiVersion();
    if (halVersion != CAMERA_HAL_API_VERSION_UNSPECIFIED &&
            apiVersion < CAMERA_MODULE_API_VERSION_2_3) {
        /*
         * Either the HAL version is unspecified in which case this just creates
         * a camera client selected by the latest device version, or
         * it's a particular version in which case the HAL must supported
         * the open_legacy call
         */
        ALOGE("%s: camera HAL module version %x doesn't support connecting to legacy HAL devices!",
                __FUNCTION__, apiVersion);
        logRejected(id, getCallingPid(), String8(clientPackageName),
                String8("HAL module version doesn't support legacy HAL connections"));
        return INVALID_OPERATION;
    }

    status_t ret = NO_ERROR;
    sp<Client> client = nullptr;
    ret = connectHelper<ICameraClient,Client>(cameraClient, id, halVersion, clientPackageName,
            clientUid, API_1, true, false, /*out*/client);

    if(ret != NO_ERROR) {
        logRejected(id, getCallingPid(), String8(clientPackageName),
                String8::format("%s (%d)", strerror(-ret), ret));
        return ret;
    }

    device = client;
    return NO_ERROR;
}

status_t CameraService::connectDevice(
        const sp<ICameraDeviceCallbacks>& cameraCb,
        int cameraId,
        const String16& clientPackageName,
        int clientUid,
        /*out*/
        sp<ICameraDeviceUser>& device) {

    status_t ret = NO_ERROR;
    String8 id = String8::format("%d", cameraId);
    sp<CameraDeviceClient> client = nullptr;
    ret = connectHelper<ICameraDeviceCallbacks,CameraDeviceClient>(cameraCb, id,
            CAMERA_HAL_API_VERSION_UNSPECIFIED, clientPackageName, clientUid, API_2, false, false,
            /*out*/client);

    if(ret != NO_ERROR) {
        logRejected(id, getCallingPid(), String8(clientPackageName),
                String8::format("%s (%d)", strerror(-ret), ret));
        return ret;
    }

    device = client;
    return NO_ERROR;
}

status_t CameraService::setTorchMode(const String16& cameraId, bool enabled,
        const sp<IBinder>& clientBinder) {
    if (enabled && clientBinder == NULL) {
        ALOGE("%s: torch client binder is NULL", __FUNCTION__);
        return -EINVAL;
    }

    String8 id = String8(cameraId.string());

    // verify id is valid.
    auto state = getCameraState(id);
    if (state == nullptr) {
        ALOGE("%s: camera id is invalid %s", id.string());
        return -EINVAL;
    }

    ICameraServiceListener::Status cameraStatus = state->getStatus();
    if (cameraStatus != ICameraServiceListener::STATUS_PRESENT &&
            cameraStatus != ICameraServiceListener::STATUS_NOT_AVAILABLE) {
        ALOGE("%s: camera id is invalid %s", id.string());
        return -EINVAL;
    }

    {
        Mutex::Autolock al(mTorchStatusMutex);
        ICameraServiceListener::TorchStatus status;
        status_t res = getTorchStatusLocked(id, &status);
        if (res) {
            ALOGE("%s: getting current torch status failed for camera %s",
                    __FUNCTION__, id.string());
            return -EINVAL;
        }

        if (status == ICameraServiceListener::TORCH_STATUS_NOT_AVAILABLE) {
            if (cameraStatus == ICameraServiceListener::STATUS_NOT_AVAILABLE) {
                ALOGE("%s: torch mode of camera %s is not available because "
                        "camera is in use", __FUNCTION__, id.string());
                return -EBUSY;
            } else {
                ALOGE("%s: torch mode of camera %s is not available due to "
                        "insufficient resources", __FUNCTION__, id.string());
                return -EUSERS;
            }
        }
    }

    status_t res = mFlashlight->setTorchMode(id, enabled);
    if (res) {
        ALOGE("%s: setting torch mode of camera %s to %d failed. %s (%d)",
                __FUNCTION__, id.string(), enabled, strerror(-res), res);
        return res;
    }

    {
        // update the link to client's death
        Mutex::Autolock al(mTorchClientMapMutex);
        ssize_t index = mTorchClientMap.indexOfKey(id);
        if (enabled) {
            if (index == NAME_NOT_FOUND) {
                mTorchClientMap.add(id, clientBinder);
            } else {
                const sp<IBinder> oldBinder = mTorchClientMap.valueAt(index);
                oldBinder->unlinkToDeath(this);

                mTorchClientMap.replaceValueAt(index, clientBinder);
            }
            clientBinder->linkToDeath(this);
        } else if (index != NAME_NOT_FOUND) {
            sp<IBinder> oldBinder = mTorchClientMap.valueAt(index);
            oldBinder->unlinkToDeath(this);
        }
    }

    return OK;
}

void CameraService::notifySystemEvent(int eventId, int arg0) {
    switch(eventId) {
        case ICameraService::USER_SWITCHED: {
            doUserSwitch(/*newUserId*/arg0);
            break;
        }
        case ICameraService::NO_EVENT:
        default: {
            ALOGW("%s: Received invalid system event from system_server: %d", __FUNCTION__,
                    eventId);
            break;
        }
    }
}

status_t CameraService::addListener(
                                const sp<ICameraServiceListener>& listener) {
    ALOGV("%s: Add listener %p", __FUNCTION__, listener.get());

    if (listener == 0) {
        ALOGE("%s: Listener must not be null", __FUNCTION__);
        return BAD_VALUE;
    }

    Mutex::Autolock lock(mServiceLock);

    {
        Mutex::Autolock lock(mStatusListenerLock);
        for (auto& it : mListenerList) {
            if (IInterface::asBinder(it) == IInterface::asBinder(listener)) {
                ALOGW("%s: Tried to add listener %p which was already subscribed",
                      __FUNCTION__, listener.get());
                return ALREADY_EXISTS;
            }
        }

        mListenerList.push_back(listener);
    }


    /* Immediately signal current status to this listener only */
    {
        Mutex::Autolock lock(mCameraStatesLock);
        for (auto& i : mCameraStates) {
            // TODO: Update binder to use String16 for camera IDs and remove;
            int id = cameraIdToInt(i.first);
            if (id == -1) continue;

            listener->onStatusChanged(i.second->getStatus(), id);
        }
    }

    /* Immediately signal current torch status to this listener only */
    {
        Mutex::Autolock al(mTorchStatusMutex);
        for (size_t i = 0; i < mTorchStatusMap.size(); i++ ) {
            String16 id = String16(mTorchStatusMap.keyAt(i).string());
            listener->onTorchStatusChanged(mTorchStatusMap.valueAt(i), id);
        }
    }

    return OK;
}

status_t CameraService::removeListener(const sp<ICameraServiceListener>& listener) {
    ALOGV("%s: Remove listener %p", __FUNCTION__, listener.get());

    if (listener == 0) {
        ALOGE("%s: Listener must not be null", __FUNCTION__);
        return BAD_VALUE;
    }

    Mutex::Autolock lock(mServiceLock);

    {
        Mutex::Autolock lock(mStatusListenerLock);
        for (auto it = mListenerList.begin(); it != mListenerList.end(); it++) {
            if (IInterface::asBinder(*it) == IInterface::asBinder(listener)) {
                mListenerList.erase(it);
                return OK;
            }
        }
    }

    ALOGW("%s: Tried to remove a listener %p which was not subscribed",
          __FUNCTION__, listener.get());

    return BAD_VALUE;
}

status_t CameraService::getLegacyParameters(int cameraId, /*out*/String16* parameters) {
    ALOGV("%s: for camera ID = %d", __FUNCTION__, cameraId);

    if (parameters == NULL) {
        ALOGE("%s: parameters must not be null", __FUNCTION__);
        return BAD_VALUE;
    }

    status_t ret = 0;

    CameraParameters shimParams;
    if ((ret = getLegacyParametersLazy(cameraId, /*out*/&shimParams)) != OK) {
        // Error logged by caller
        return ret;
    }

    String8 shimParamsString8 = shimParams.flatten();
    String16 shimParamsString16 = String16(shimParamsString8);

    *parameters = shimParamsString16;

    return OK;
}

status_t CameraService::supportsCameraApi(int cameraId, int apiVersion) {
    ALOGV("%s: for camera ID = %d", __FUNCTION__, cameraId);

    switch (apiVersion) {
        case API_VERSION_1:
        case API_VERSION_2:
            break;
        default:
            ALOGE("%s: Bad API version %d", __FUNCTION__, apiVersion);
            return BAD_VALUE;
    }

    int facing = -1;
    int deviceVersion = getDeviceVersion(cameraId, &facing);

    switch(deviceVersion) {
      case CAMERA_DEVICE_API_VERSION_1_0:
      case CAMERA_DEVICE_API_VERSION_2_0:
      case CAMERA_DEVICE_API_VERSION_2_1:
      case CAMERA_DEVICE_API_VERSION_3_0:
      case CAMERA_DEVICE_API_VERSION_3_1:
        if (apiVersion == API_VERSION_2) {
            ALOGV("%s: Camera id %d uses HAL prior to HAL3.2, doesn't support api2 without shim",
                    __FUNCTION__, cameraId);
            return -EOPNOTSUPP;
        } else { // if (apiVersion == API_VERSION_1) {
            ALOGV("%s: Camera id %d uses older HAL before 3.2, but api1 is always supported",
                    __FUNCTION__, cameraId);
            return OK;
        }
      case CAMERA_DEVICE_API_VERSION_3_2:
      case CAMERA_DEVICE_API_VERSION_3_3:
        ALOGV("%s: Camera id %d uses HAL3.2 or newer, supports api1/api2 directly",
                __FUNCTION__, cameraId);
        return OK;
      case -1:
        ALOGE("%s: Invalid camera id %d", __FUNCTION__, cameraId);
        return BAD_VALUE;
      default:
        ALOGE("%s: Unknown camera device HAL version: %d", __FUNCTION__, deviceVersion);
        return INVALID_OPERATION;
    }

    return OK;
}

void CameraService::removeByClient(const BasicClient* client) {
    Mutex::Autolock lock(mServiceLock);
    for (auto& i : mActiveClientManager.getAll()) {
        auto clientSp = i->getValue();
        if (clientSp.get() == client) {
            mActiveClientManager.remove(i);
        }
    }
}

bool CameraService::evictClientIdByRemote(const wp<IBinder>& remote) {
    const int callingPid = getCallingPid();
    const int servicePid = getpid();
    bool ret = false;
    {
        // Acquire mServiceLock and prevent other clients from connecting
        std::unique_ptr<AutoConditionLock> lock =
                AutoConditionLock::waitAndAcquire(mServiceLockWrapper);


        std::vector<sp<BasicClient>> evicted;
        for (auto& i : mActiveClientManager.getAll()) {
            auto clientSp = i->getValue();
            if (clientSp.get() == nullptr) {
                ALOGE("%s: Dead client still in mActiveClientManager.", __FUNCTION__);
                mActiveClientManager.remove(i);
                continue;
            }
            if (remote == clientSp->getRemote() && (callingPid == servicePid ||
                    callingPid == clientSp->getClientPid())) {
                mActiveClientManager.remove(i);
                evicted.push_back(clientSp);

                // Notify the client of disconnection
                clientSp->notifyError(ICameraDeviceCallbacks::ERROR_CAMERA_DISCONNECTED,
                        CaptureResultExtras());
            }
        }

        // Do not hold mServiceLock while disconnecting clients, but retain the condition blocking
        // other clients from connecting in mServiceLockWrapper if held
        mServiceLock.unlock();

        // Do not clear caller identity, remote caller should be client proccess

        for (auto& i : evicted) {
            if (i.get() != nullptr) {
                i->disconnect();
                ret = true;
            }
        }

        // Reacquire mServiceLock
        mServiceLock.lock();

    } // lock is destroyed, allow further connect calls

    return ret;
}


std::shared_ptr<CameraService::CameraState> CameraService::getCameraState(
        const String8& cameraId) const {
    std::shared_ptr<CameraState> state;
    {
        Mutex::Autolock lock(mCameraStatesLock);
        auto iter = mCameraStates.find(cameraId);
        if (iter != mCameraStates.end()) {
            state = iter->second;
        }
    }
    return state;
}

sp<CameraService::BasicClient> CameraService::removeClientLocked(const String8& cameraId) {
    // Remove from active clients list
    auto clientDescriptorPtr = mActiveClientManager.remove(cameraId);
    if (clientDescriptorPtr == nullptr) {
        ALOGW("%s: Could not evict client, no client for camera ID %s", __FUNCTION__,
                cameraId.string());
        return sp<BasicClient>{nullptr};
    }

    return clientDescriptorPtr->getValue();
}

void CameraService::doUserSwitch(int newUserId) {
    // Acquire mServiceLock and prevent other clients from connecting
    std::unique_ptr<AutoConditionLock> lock =
            AutoConditionLock::waitAndAcquire(mServiceLockWrapper);

    if (newUserId <= 0) {
        ALOGW("%s: Bad user ID %d given during user switch, resetting to default.", __FUNCTION__,
                newUserId);
        newUserId = DEFAULT_LAST_USER_ID;
    }

    logUserSwitch(mLastUserId, newUserId);

    mLastUserId = newUserId;

    // Current user has switched, evict all current clients.
    std::vector<sp<BasicClient>> evicted;
    for (auto& i : mActiveClientManager.getAll()) {
        auto clientSp = i->getValue();

        if (clientSp.get() == nullptr) {
            ALOGE("%s: Dead client still in mActiveClientManager.", __FUNCTION__);
            continue;
        }

        evicted.push_back(clientSp);

        String8 curTime = getFormattedCurrentTime();

        ALOGE("Evicting conflicting client for camera ID %s due to user change",
                i->getKey().string());

        // Log the clients evicted
        logEvent(String8::format("EVICT device %s client held by package %s (PID %"
                PRId32 ", priority %" PRId32 ")\n   - Evicted due to user switch.",
                i->getKey().string(), String8{clientSp->getPackageName()}.string(),
                i->getOwnerId(), i->getPriority()));

    }

    // Do not hold mServiceLock while disconnecting clients, but retain the condition
    // blocking other clients from connecting in mServiceLockWrapper if held.
    mServiceLock.unlock();

    // Clear caller identity temporarily so client disconnect PID checks work correctly
    int64_t token = IPCThreadState::self()->clearCallingIdentity();

    for (auto& i : evicted) {
        i->disconnect();
    }

    IPCThreadState::self()->restoreCallingIdentity(token);

    // Reacquire mServiceLock
    mServiceLock.lock();
}

void CameraService::logEvent(const char* event) {
    String8 curTime = getFormattedCurrentTime();
    Mutex::Autolock l(mLogLock);
    mEventLog.add(String8::format("%s : %s", curTime.string(), event));
}

void CameraService::logDisconnected(const char* cameraId, int clientPid,
        const char* clientPackage) {
    // Log the clients evicted
    logEvent(String8::format("DISCONNECT device %s client for package %s (PID %d)", cameraId,
            clientPackage, clientPid));
}

void CameraService::logConnected(const char* cameraId, int clientPid,
        const char* clientPackage) {
    // Log the clients evicted
    logEvent(String8::format("CONNECT device %s client for package %s (PID %d)", cameraId,
            clientPackage, clientPid));
}

void CameraService::logRejected(const char* cameraId, int clientPid,
        const char* clientPackage, const char* reason) {
    // Log the client rejected
    logEvent(String8::format("REJECT device %s client for package %s (PID %d), reason: (%s)",
            cameraId, clientPackage, clientPid, reason));
}

void CameraService::logUserSwitch(int oldUserId, int newUserId) {
    // Log the new and old users
    logEvent(String8::format("USER_SWITCH from old user: %d , to new user: %d", oldUserId,
            newUserId));
}

void CameraService::logDeviceRemoved(const char* cameraId, const char* reason) {
    // Log the device removal
    logEvent(String8::format("REMOVE device %s, reason: (%s)", cameraId, reason));
}

void CameraService::logDeviceAdded(const char* cameraId, const char* reason) {
    // Log the device removal
    logEvent(String8::format("ADD device %s, reason: (%s)", cameraId, reason));
}

void CameraService::logClientDied(int clientPid, const char* reason) {
    // Log the device removal
    logEvent(String8::format("DIED client(s) with PID %d, reason: (%s)", clientPid, reason));
}

status_t CameraService::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
        uint32_t flags) {

    const int pid = getCallingPid();
    const int selfPid = getpid();

    // Permission checks
    switch (code) {
        case BnCameraService::CONNECT:
        case BnCameraService::CONNECT_DEVICE:
        case BnCameraService::CONNECT_LEGACY: {
            if (pid != selfPid) {
                // we're called from a different process, do the real check
                if (!checkCallingPermission(
                        String16("android.permission.CAMERA"))) {
                    const int uid = getCallingUid();
                    ALOGE("Permission Denial: "
                         "can't use the camera pid=%d, uid=%d", pid, uid);
                    return PERMISSION_DENIED;
                }
            }
            break;
        }
        case BnCameraService::NOTIFY_SYSTEM_EVENT: {
            if (pid != selfPid) {
                // Ensure we're being called by system_server, or similar process with
                // permissions to notify the camera service about system events
                if (!checkCallingPermission(
                        String16("android.permission.CAMERA_SEND_SYSTEM_EVENTS"))) {
                    const int uid = getCallingUid();
                    ALOGE("Permission Denial: cannot send updates to camera service about system"
                            " events from pid=%d, uid=%d", pid, uid);
                    return PERMISSION_DENIED;
                }
            }
            break;
        }
    }

    return BnCameraService::onTransact(code, data, reply, flags);
}

// We share the media players for shutter and recording sound for all clients.
// A reference count is kept to determine when we will actually release the
// media players.

MediaPlayer* CameraService::newMediaPlayer(const char *file) {
    MediaPlayer* mp = new MediaPlayer();
    if (mp->setDataSource(NULL /* httpService */, file, NULL) == NO_ERROR) {
        mp->setAudioStreamType(AUDIO_STREAM_ENFORCED_AUDIBLE);
        mp->prepare();
    } else {
        ALOGE("Failed to load CameraService sounds: %s", file);
        return NULL;
    }
    return mp;
}

void CameraService::loadSound() {
    Mutex::Autolock lock(mSoundLock);
    LOG1("CameraService::loadSound ref=%d", mSoundRef);
    if (mSoundRef++) return;

    mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/system/media/audio/ui/camera_click.ogg");
    mSoundPlayer[SOUND_RECORDING] = newMediaPlayer("/system/media/audio/ui/VideoRecord.ogg");
}

void CameraService::releaseSound() {
    Mutex::Autolock lock(mSoundLock);
    LOG1("CameraService::releaseSound ref=%d", mSoundRef);
    if (--mSoundRef) return;

    for (int i = 0; i < NUM_SOUNDS; i++) {
        if (mSoundPlayer[i] != 0) {
            mSoundPlayer[i]->disconnect();
            mSoundPlayer[i].clear();
        }
    }
}

void CameraService::playSound(sound_kind kind) {
    LOG1("playSound(%d)", kind);
    Mutex::Autolock lock(mSoundLock);
    sp<MediaPlayer> player = mSoundPlayer[kind];
    if (player != 0) {
        player->seekTo(0);
        player->start();
    }
}

// ----------------------------------------------------------------------------

CameraService::Client::Client(const sp<CameraService>& cameraService,
        const sp<ICameraClient>& cameraClient,
        const String16& clientPackageName,
        int cameraId, int cameraFacing,
        int clientPid, uid_t clientUid,
        int servicePid) :
        CameraService::BasicClient(cameraService,
                IInterface::asBinder(cameraClient),
                clientPackageName,
                cameraId, cameraFacing,
                clientPid, clientUid,
                servicePid)
{
    int callingPid = getCallingPid();
    LOG1("Client::Client E (pid %d, id %d)", callingPid, cameraId);

    mRemoteCallback = cameraClient;

    cameraService->loadSound();

    LOG1("Client::Client X (pid %d, id %d)", callingPid, cameraId);
}

// tear down the client
CameraService::Client::~Client() {
    ALOGV("~Client");
    mDestructionStarted = true;

    mCameraService->releaseSound();
    // unconditionally disconnect. function is idempotent
    Client::disconnect();
}

CameraService::BasicClient::BasicClient(const sp<CameraService>& cameraService,
        const sp<IBinder>& remoteCallback,
        const String16& clientPackageName,
        int cameraId, int cameraFacing,
        int clientPid, uid_t clientUid,
        int servicePid):
        mClientPackageName(clientPackageName), mDisconnected(false)
{
    mCameraService = cameraService;
    mRemoteBinder = remoteCallback;
    mCameraId = cameraId;
    mCameraFacing = cameraFacing;
    mClientPid = clientPid;
    mClientUid = clientUid;
    mServicePid = servicePid;
    mOpsActive = false;
    mDestructionStarted = false;
}

CameraService::BasicClient::~BasicClient() {
    ALOGV("~BasicClient");
    mDestructionStarted = true;
}

void CameraService::BasicClient::disconnect() {
    if (mDisconnected) {
        ALOGE("%s: Disconnect called on already disconnected client for device %d", __FUNCTION__,
                mCameraId);
        return;
    }
    mDisconnected = true;;

    mCameraService->removeByClient(this);
    mCameraService->logDisconnected(String8::format("%d", mCameraId), mClientPid,
            String8(mClientPackageName));

    sp<IBinder> remote = getRemote();
    if (remote != nullptr) {
        remote->unlinkToDeath(mCameraService);
    }

    finishCameraOps();
    ALOGI("%s: Disconnected client for camera %d for PID %d", __FUNCTION__, mCameraId, mClientPid);

    // client shouldn't be able to call into us anymore
    mClientPid = 0;
}

String16 CameraService::BasicClient::getPackageName() const {
    return mClientPackageName;
}


int CameraService::BasicClient::getClientPid() const {
    return mClientPid;
}

status_t CameraService::BasicClient::startCameraOps() {
    int32_t res;
    // Notify app ops that the camera is not available
    mOpsCallback = new OpsCallback(this);

    {
        ALOGV("%s: Start camera ops, package name = %s, client UID = %d",
              __FUNCTION__, String8(mClientPackageName).string(), mClientUid);
    }

    mAppOpsManager.startWatchingMode(AppOpsManager::OP_CAMERA,
            mClientPackageName, mOpsCallback);
    res = mAppOpsManager.startOp(AppOpsManager::OP_CAMERA,
            mClientUid, mClientPackageName);

    if (res != AppOpsManager::MODE_ALLOWED) {
        ALOGI("Camera %d: Access for \"%s\" has been revoked",
                mCameraId, String8(mClientPackageName).string());
        return PERMISSION_DENIED;
    }

    mOpsActive = true;

    // Transition device availability listeners from PRESENT -> NOT_AVAILABLE
    mCameraService->updateStatus(ICameraServiceListener::STATUS_NOT_AVAILABLE,
            String8::format("%d", mCameraId));

    return OK;
}

status_t CameraService::BasicClient::finishCameraOps() {
    // Check if startCameraOps succeeded, and if so, finish the camera op
    if (mOpsActive) {
        // Notify app ops that the camera is available again
        mAppOpsManager.finishOp(AppOpsManager::OP_CAMERA, mClientUid,
                mClientPackageName);
        mOpsActive = false;

        auto rejected = {ICameraServiceListener::STATUS_NOT_PRESENT,
                ICameraServiceListener::STATUS_ENUMERATING};

        // Transition to PRESENT if the camera is not in either of the rejected states
        mCameraService->updateStatus(ICameraServiceListener::STATUS_PRESENT,
                String8::format("%d", mCameraId), rejected);

        // Notify flashlight that a camera device is closed.
        mCameraService->mFlashlight->deviceClosed(
                String8::format("%d", mCameraId));
    }
    // Always stop watching, even if no camera op is active
    if (mOpsCallback != NULL) {
        mAppOpsManager.stopWatchingMode(mOpsCallback);
    }
    mOpsCallback.clear();

    return OK;
}

void CameraService::BasicClient::opChanged(int32_t op, const String16& packageName) {
    String8 name(packageName);
    String8 myName(mClientPackageName);

    if (op != AppOpsManager::OP_CAMERA) {
        ALOGW("Unexpected app ops notification received: %d", op);
        return;
    }

    int32_t res;
    res = mAppOpsManager.checkOp(AppOpsManager::OP_CAMERA,
            mClientUid, mClientPackageName);
    ALOGV("checkOp returns: %d, %s ", res,
            res == AppOpsManager::MODE_ALLOWED ? "ALLOWED" :
            res == AppOpsManager::MODE_IGNORED ? "IGNORED" :
            res == AppOpsManager::MODE_ERRORED ? "ERRORED" :
            "UNKNOWN");

    if (res != AppOpsManager::MODE_ALLOWED) {
        ALOGI("Camera %d: Access for \"%s\" revoked", mCameraId,
                myName.string());
        // Reset the client PID to allow server-initiated disconnect,
        // and to prevent further calls by client.
        mClientPid = getCallingPid();
        CaptureResultExtras resultExtras; // a dummy result (invalid)
        notifyError(ICameraDeviceCallbacks::ERROR_CAMERA_SERVICE, resultExtras);
        disconnect();
    }
}

// ----------------------------------------------------------------------------

// Provide client strong pointer for callbacks.
sp<CameraService::Client> CameraService::Client::getClientFromCookie(void* user) {
    String8 cameraId = String8::format("%d", (int)(intptr_t) user);
    auto clientDescriptor = gCameraService->mActiveClientManager.get(cameraId);
    if (clientDescriptor != nullptr) {
        return sp<Client>{
                static_cast<Client*>(clientDescriptor->getValue().get())};
    }
    return sp<Client>{nullptr};
}

void CameraService::Client::notifyError(ICameraDeviceCallbacks::CameraErrorCode errorCode,
        const CaptureResultExtras& resultExtras) {
    mRemoteCallback->notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_RELEASED, 0);
}

// NOTE: function is idempotent
void CameraService::Client::disconnect() {
    ALOGV("Client::disconnect");
    BasicClient::disconnect();
}

CameraService::Client::OpsCallback::OpsCallback(wp<BasicClient> client):
        mClient(client) {
}

void CameraService::Client::OpsCallback::opChanged(int32_t op,
        const String16& packageName) {
    sp<BasicClient> client = mClient.promote();
    if (client != NULL) {
        client->opChanged(op, packageName);
    }
}

// ----------------------------------------------------------------------------
//                  CameraState
// ----------------------------------------------------------------------------

CameraService::CameraState::CameraState(const String8& id, int cost,
        const std::set<String8>& conflicting) : mId(id),
        mStatus(ICameraServiceListener::STATUS_PRESENT), mCost(cost), mConflicting(conflicting) {}

CameraService::CameraState::~CameraState() {}

ICameraServiceListener::Status CameraService::CameraState::getStatus() const {
    Mutex::Autolock lock(mStatusLock);
    return mStatus;
}

CameraParameters CameraService::CameraState::getShimParams() const {
    return mShimParams;
}

void CameraService::CameraState::setShimParams(const CameraParameters& params) {
    mShimParams = params;
}

int CameraService::CameraState::getCost() const {
    return mCost;
}

std::set<String8> CameraService::CameraState::getConflicting() const {
    return mConflicting;
}

String8 CameraService::CameraState::getId() const {
    return mId;
}

// ----------------------------------------------------------------------------
//                  CameraClientManager
// ----------------------------------------------------------------------------

CameraService::CameraClientManager::~CameraClientManager() {}

sp<CameraService::BasicClient> CameraService::CameraClientManager::getCameraClient(
        const String8& id) const {
    auto descriptor = get(id);
    if (descriptor == nullptr) {
        return sp<BasicClient>{nullptr};
    }
    return descriptor->getValue();
}

String8 CameraService::CameraClientManager::toString() const {
    auto all = getAll();
    String8 ret("[");
    bool hasAny = false;
    for (auto& i : all) {
        hasAny = true;
        String8 key = i->getKey();
        int32_t cost = i->getCost();
        int32_t pid = i->getOwnerId();
        int32_t priority = i->getPriority();
        auto conflicting = i->getConflicting();
        auto clientSp = i->getValue();
        String8 packageName;
        if (clientSp.get() != nullptr) {
            packageName = String8{clientSp->getPackageName()};
        }
        ret.appendFormat("\n(Camera ID: %s, Cost: %" PRId32 ", PID: %" PRId32 ", Priority: %"
                PRId32 ", ", key.string(), cost, pid, priority);

        if (packageName.size() != 0) {
            ret.appendFormat("Client Package Name: %s", packageName.string());
        }

        ret.append(", Conflicting Client Devices: {");
        for (auto& j : conflicting) {
            ret.appendFormat("%s, ", j.string());
        }
        ret.append("})");
    }
    if (hasAny) ret.append("\n");
    ret.append("]\n");
    return ret;
}

CameraService::DescriptorPtr CameraService::CameraClientManager::makeClientDescriptor(
        const String8& key, const sp<BasicClient>& value, int32_t cost,
        const std::set<String8>& conflictingKeys, int32_t priority, int32_t ownerId) {

    return std::make_shared<resource_policy::ClientDescriptor<String8, sp<BasicClient>>>(
            key, value, cost, conflictingKeys, priority, ownerId);
}

CameraService::DescriptorPtr CameraService::CameraClientManager::makeClientDescriptor(
        const sp<BasicClient>& value, const CameraService::DescriptorPtr& partial) {
    return makeClientDescriptor(partial->getKey(), value, partial->getCost(),
            partial->getConflicting(), partial->getPriority(), partial->getOwnerId());
}

// ----------------------------------------------------------------------------

static const int kDumpLockRetries = 50;
static const int kDumpLockSleep = 60000;

static bool tryLock(Mutex& mutex)
{
    bool locked = false;
    for (int i = 0; i < kDumpLockRetries; ++i) {
        if (mutex.tryLock() == NO_ERROR) {
            locked = true;
            break;
        }
        usleep(kDumpLockSleep);
    }
    return locked;
}

status_t CameraService::dump(int fd, const Vector<String16>& args) {
    String8 result("Dump of the Camera Service:\n");
    if (checkCallingPermission(String16("android.permission.DUMP")) == false) {
        result.appendFormat("Permission Denial: "
                "can't dump CameraService from pid=%d, uid=%d\n",
                getCallingPid(),
                getCallingUid());
        write(fd, result.string(), result.size());
    } else {
        bool locked = tryLock(mServiceLock);
        // failed to lock - CameraService is probably deadlocked
        if (!locked) {
            result.append("CameraService may be deadlocked\n");
            write(fd, result.string(), result.size());
        }

        bool hasClient = false;
        if (!mModule) {
            result = String8::format("No camera module available!\n");
            write(fd, result.string(), result.size());
            if (locked) mServiceLock.unlock();
            return NO_ERROR;
        }

        result = String8::format("Camera module HAL API version: 0x%x\n", mModule->getHalApiVersion());
        result.appendFormat("Camera module API version: 0x%x\n", mModule->getModuleApiVersion());
        result.appendFormat("Camera module name: %s\n", mModule->getModuleName());
        result.appendFormat("Camera module author: %s\n", mModule->getModuleAuthor());
        result.appendFormat("Number of camera devices: %d\n", mNumberOfCameras);
        String8 activeClientString = mActiveClientManager.toString();
        result.appendFormat("Active Camera Clients:\n%s", activeClientString.string());

        sp<VendorTagDescriptor> desc = VendorTagDescriptor::getGlobalVendorTagDescriptor();
        if (desc == NULL) {
            result.appendFormat("Vendor tags left unimplemented.\n");
        } else {
            result.appendFormat("Vendor tag definitions:\n");
        }

        write(fd, result.string(), result.size());

        if (desc != NULL) {
            desc->dump(fd, /*verbosity*/2, /*indentation*/4);
        }

        result = String8("Prior client events (most recent at top):\n");

        {
            Mutex::Autolock l(mLogLock);
            for (const auto& msg : mEventLog) {
                result.appendFormat("%s\n", msg.string());
            }

            if (mEventLog.size() == DEFAULT_EVENT_LOG_LENGTH) {
                result.append("...\n");
            }
        }

        write(fd, result.string(), result.size());

        bool stateLocked = tryLock(mCameraStatesLock);
        if (!stateLocked) {
            result = String8::format("CameraStates in use, may be deadlocked\n");
            write(fd, result.string(), result.size());
        }

        for (auto& state : mCameraStates) {
            String8 cameraId = state.first;
            result = String8::format("Camera %s information:\n", cameraId.string());
            camera_info info;

            // TODO: Change getCameraInfo + HAL to use String cameraIds
            status_t rc = mModule->getCameraInfo(cameraIdToInt(cameraId), &info);
            if (rc != OK) {
                result.appendFormat("  Error reading static information!\n");
                write(fd, result.string(), result.size());
            } else {
                result.appendFormat("  Facing: %s\n",
                        info.facing == CAMERA_FACING_BACK ? "BACK" : "FRONT");
                result.appendFormat("  Orientation: %d\n", info.orientation);
                int deviceVersion;
                if (mModule->getModuleApiVersion() < CAMERA_MODULE_API_VERSION_2_0) {
                    deviceVersion = CAMERA_DEVICE_API_VERSION_1_0;
                } else {
                    deviceVersion = info.device_version;
                }

                auto conflicting = state.second->getConflicting();
                result.appendFormat("  Resource Cost: %d\n", state.second->getCost());
                result.appendFormat("  Conflicting Devices:");
                for (auto& id : conflicting) {
                    result.appendFormat(" %s", cameraId.string());
                }
                if (conflicting.size() == 0) {
                    result.appendFormat(" NONE");
                }
                result.appendFormat("\n");

                result.appendFormat("  Device version: %#x\n", deviceVersion);
                if (deviceVersion >= CAMERA_DEVICE_API_VERSION_2_0) {
                    result.appendFormat("  Device static metadata:\n");
                    write(fd, result.string(), result.size());
                    dump_indented_camera_metadata(info.static_camera_characteristics,
                            fd, /*verbosity*/2, /*indentation*/4);
                } else {
                    write(fd, result.string(), result.size());
                }

                CameraParameters p = state.second->getShimParams();
                if (!p.isEmpty()) {
                    result = String8::format("  Camera1 API shim is using parameters:\n        ");
                    write(fd, result.string(), result.size());
                    p.dump(fd, args);
                }
            }

            auto clientDescriptor = mActiveClientManager.get(cameraId);
            if (clientDescriptor == nullptr) {
                result = String8::format("  Device %s is closed, no client instance\n",
                        cameraId.string());
                write(fd, result.string(), result.size());
                continue;
            }
            hasClient = true;
            result = String8::format("  Device %s is open. Client instance dump:\n\n",
                    cameraId.string());
            result.appendFormat("Client priority level: %d\n", clientDescriptor->getPriority());
            result.appendFormat("Client PID: %d\n", clientDescriptor->getOwnerId());

            auto client = clientDescriptor->getValue();
            result.appendFormat("Client package: %s\n",
                    String8(client->getPackageName()).string());
            write(fd, result.string(), result.size());

            client->dump(fd, args);
        }

        if (stateLocked) mCameraStatesLock.unlock();

        if (!hasClient) {
            result = String8::format("\nNo active camera clients yet.\n");
            write(fd, result.string(), result.size());
        }

        if (locked) mServiceLock.unlock();

        // Dump camera traces if there were any
        write(fd, "\n", 1);
        camera3::CameraTraces::dump(fd, args);

        // change logging level
        int n = args.size();
        for (int i = 0; i + 1 < n; i++) {
            String16 verboseOption("-v");
            if (args[i] == verboseOption) {
                String8 levelStr(args[i+1]);
                int level = atoi(levelStr.string());
                result = String8::format("\nSetting log level to %d.\n", level);
                setLogLevel(level);
                write(fd, result.string(), result.size());
            }
        }
    }
    return NO_ERROR;
}

void CameraService::handleTorchClientBinderDied(const wp<IBinder> &who) {
    Mutex::Autolock al(mTorchClientMapMutex);
    for (size_t i = 0; i < mTorchClientMap.size(); i++) {
        if (mTorchClientMap[i] == who) {
            // turn off the torch mode that was turned on by dead client
            String8 cameraId = mTorchClientMap.keyAt(i);
            status_t res = mFlashlight->setTorchMode(cameraId, false);
            if (res) {
                ALOGE("%s: torch client died but couldn't turn off torch: "
                    "%s (%d)", __FUNCTION__, strerror(-res), res);
                return;
            }
            mTorchClientMap.removeItemsAt(i);
            break;
        }
    }
}

/*virtual*/void CameraService::binderDied(const wp<IBinder> &who) {

    /**
      * While tempting to promote the wp<IBinder> into a sp, it's actually not supported by the
      * binder driver
      */

    logClientDied(getCallingPid(), String8("Binder died unexpectedly"));

    // check torch client
    handleTorchClientBinderDied(who);

    // check camera device client
    if(!evictClientIdByRemote(who)) {
        ALOGV("%s: Java client's binder death already cleaned up (normal case)", __FUNCTION__);
        return;
    }

    ALOGE("%s: Java client's binder died, removing it from the list of active clients",
            __FUNCTION__);
}

void CameraService::updateStatus(ICameraServiceListener::Status status, const String8& cameraId) {
    updateStatus(status, cameraId, {});
}

void CameraService::updateStatus(ICameraServiceListener::Status status, const String8& cameraId,
        std::initializer_list<ICameraServiceListener::Status> rejectSourceStates) {
    // Do not lock mServiceLock here or can get into a deadlock from
    // connect() -> disconnect -> updateStatus

    auto state = getCameraState(cameraId);

    if (state == nullptr) {
        ALOGW("%s: Could not update the status for %s, no such device exists", __FUNCTION__,
                cameraId.string());
        return;
    }

    // Update the status for this camera state, then send the onStatusChangedCallbacks to each
    // of the listeners with both the mStatusStatus and mStatusListenerLock held
    state->updateStatus(status, cameraId, rejectSourceStates, [this]
            (const String8& cameraId, ICameraServiceListener::Status status) {

            // Update torch status
            if (status == ICameraServiceListener::STATUS_NOT_PRESENT ||
                status == ICameraServiceListener::STATUS_NOT_AVAILABLE) {
                // Update torch status to not available when the camera device becomes not present
                // or not available.
                onTorchStatusChanged(cameraId, ICameraServiceListener::TORCH_STATUS_NOT_AVAILABLE);
            } else if (status == ICameraServiceListener::STATUS_PRESENT) {
                // Update torch status to available when the camera device becomes present or
                // available
                onTorchStatusChanged(cameraId, ICameraServiceListener::TORCH_STATUS_AVAILABLE_OFF);
            }

            Mutex::Autolock lock(mStatusListenerLock);

            for (auto& listener : mListenerList) {
                // TODO: Refactor status listeners to use strings for Camera IDs and remove this.
                int id = cameraIdToInt(cameraId);
                if (id != -1) listener->onStatusChanged(status, id);
            }
        });
}

status_t CameraService::getTorchStatusLocked(
        const String8& cameraId,
        ICameraServiceListener::TorchStatus *status) const {
    if (!status) {
        return BAD_VALUE;
    }
    ssize_t index = mTorchStatusMap.indexOfKey(cameraId);
    if (index == NAME_NOT_FOUND) {
        // invalid camera ID or the camera doesn't have a flash unit
        return NAME_NOT_FOUND;
    }

    *status = mTorchStatusMap.valueAt(index);
    return OK;
}

status_t CameraService::setTorchStatusLocked(const String8& cameraId,
        ICameraServiceListener::TorchStatus status) {
    ssize_t index = mTorchStatusMap.indexOfKey(cameraId);
    if (index == NAME_NOT_FOUND) {
        return BAD_VALUE;
    }
    ICameraServiceListener::TorchStatus& item =
            mTorchStatusMap.editValueAt(index);
    item = status;

    return OK;
}

}; // namespace android