在connectHelper方法中的makeClient中创建 CameraDeviceClient
Status CameraService::makeClient(const sp<CameraService>& cameraService,
const sp<IInterface>& cameraCb, const String16& packageName,
const std::unique_ptr<String16>& featureId, const String8& cameraId, int api1CameraId,
if (halVersion < 0 || halVersion == deviceVersion) {
// Camera2 API route 走到了这里创建了CameraDeviceClient
sp<hardware::camera2::ICameraDeviceCallbacks> tmp =
static_cast<hardware::camera2::ICameraDeviceCallbacks*>(cameraCb.get());
*client = new CameraDeviceClient(cameraService, tmp, packageName, featureId,
cameraId, facing, clientPid, clientUid, servicePid);
}
break;
default:
// Should not be reachable
ALOGE("Unknown camera device HAL version: %d", deviceVersion);
return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
"Camera device \"%s\" has unknown HAL version %d",
cameraId.string(), deviceVersion);
}
}
return Status::ok();
}
CameraDeviceClient 类中调用初始化了 Camera2ClientBase 的initialize方法
status_t CameraDeviceClient::initializeImpl(TProviderPtr providerPtr, const String8& monitorTags) {
ATRACE_CALL();
status_t res;
// 初始化了 Camera2ClientBase , 模板 TProviderPtr 在此处即是 CameraProviderManager 类。
res = Camera2ClientBase::initialize(providerPtr, monitorTags);
if (res != OK) {
return res;
}
String8 threadName;
// 处理图像返回
mFrameProcessor = new FrameProcessorBase(mDevice);
threadName = String8::format("CDU-%s-FrameProc", mCameraIdStr.string());
mFrameProcessor->run(threadName.string());
mFrameProcessor->registerListener(camera2::FrameProcessorBase::FRAME_PROCESSOR_LISTENER_MIN_ID,
camera2::FrameProcessorBase::FRAME_PROCESSOR_LISTENER_MAX_ID,
/*listener*/this,
/*sendPartials*/true);
auto deviceInfo = mDevice->info();
camera_metadata_entry_t physicalKeysEntry = deviceInfo.find(
ANDROID_REQUEST_AVAILABLE_PHYSICAL_CAMERA_REQUEST_KEYS);
if (physicalKeysEntry.count > 0) {
mSupportedPhysicalRequestKeys.insert(mSupportedPhysicalRequestKeys.begin(),
physicalKeysEntry.data.i32,
physicalKeysEntry.data.i32 + physicalKeysEntry.count);
}
mProviderManager = providerPtr;
return OK;
}
Camera2ClientBase 的 initializeImpl 方法
template <typename TClientBase> //对应 CameraDeviceClientBase
template <typename TProviderPtr> // CameraProviderManager
status_t Camera2ClientBase<TClientBase>::initializeImpl(TProviderPtr providerPtr,
const String8& monitorTags) {
ATRACE_CALL();
ALOGV("%s: Initializing client for camera %s", __FUNCTION__,
TClientBase::mCameraIdStr.string());
status_t res;
// 检查相机的ops 权限
res = TClientBase::startCameraOps();
if (res != OK) {
return res;
}
if (mDevice == NULL) {
ALOGE("%s: Camera %s: No device connected",
__FUNCTION__, TClientBase::mCameraIdStr.string());
return NO_INIT;
}
// 初始化 Camera3Device 的实例，注意此处传入了 CameraProviderManager。
res = mDevice->initialize(providerPtr, monitorTags);
if (res != OK) {
ALOGE("%s: Camera %s: unable to initialize device: %s (%d)",
__FUNCTION__, TClientBase::mCameraIdStr.string(), strerror(-res), res);
return res;
}
wp<NotificationListener> weakThis(this);
// Camera3Device 中设置回调通知
res = mDevice->setNotifyCallback(weakThis);
return OK;
}
Camera3Device 中的initialize方法
status_t Camera3Device::initialize(sp<CameraProviderManager> manager, const String8& monitorTags) {
ATRACE_CALL();
Mutex::Autolock il(mInterfaceLock);
Mutex::Autolock l(mLock);
ALOGV("%s: Initializing HIDL device for camera %s", __FUNCTION__, mId.string());
if (mStatus != STATUS_UNINITIALIZED) {
CLOGE("Already initialized!");
return INVALID_OPERATION;
}
if (manager == nullptr) return INVALID_OPERATION;
sp<ICameraDeviceSession> session;
ATRACE_BEGIN("CameraHal::openSession");
// 这里便进入到 CameraProviderManager 的openSession 中去了
status_t res = manager->openSession(mId.string(), this,
/*out*/ &session);
ATRACE_END();
if (res != OK) {
SET_ERR_L("Could not open camera session: %s (%d)", strerror(-res), res);
return res;
}
}
CameraProviderManager
status_t CameraProviderManager::openSession(const std::string &id,
const sp<device::V1_0::ICameraDeviceCallback>& callback,
/*out*/
sp<device::V1_0::ICameraDevice> *session) {
std::lock_guard<std::mutex> lock(mInterfaceMutex);
auto deviceInfo = findDeviceInfoLocked(id,
/*minVersion*/ {1,0}, /*maxVersion*/ {2,0});
if (deviceInfo == nullptr) return NAME_NOT_FOUND;
auto *deviceInfo1 = static_cast<ProviderInfo::DeviceInfo1*>(deviceInfo);
sp<ProviderInfo> parentProvider = deviceInfo->mParentProvider.promote();
if (parentProvider == nullptr) {
return DEAD_OBJECT;
}
const sp<provider::V2_4::ICameraProvider> provider = parentProvider->startProviderInterface();
if (provider == nullptr) {
return DEAD_OBJECT;
}
saveRef(DeviceMode::CAMERA, id, provider);
auto interface = deviceInfo1->startDeviceInterface<
CameraProviderManager::ProviderInfo::DeviceInfo1::InterfaceT>();
if (interface == nullptr) {
return DEAD_OBJECT;
}
// 在这一层调用到 HAl 层的 对应的CameraDevice2 的open
hardware::Return<Status> status = interface->open(callback);
if (!status.isOk()) {
removeRef(DeviceMode::CAMERA, id);
ALOGE("%s: Transaction error opening a session for camera device %s: %s",
__FUNCTION__, id.c_str(), status.description().c_str());
return DEAD_OBJECT;
}
if (status == Status::OK) {
*session = interface;
}
return mapToStatusT(status);
}
HAL Service CameraDevice
CameraDevice 的实例实际上在初始化在HAL 层 LegacyCameraProviderImpl 初始化的时候，已经初始化相应的版本了
Return<void> CameraDevice::open(const sp<ICameraDeviceCallback>& callback,
ICameraDevice::open_cb _hidl_cb) {
Status status = initStatus();
sp<CameraDeviceSession> session = nullptr;
if (callback == nullptr) {
ALOGE("%s: cannot open camera %s. callback is null!",
__FUNCTION__, mCameraId.c_str());
_hidl_cb(Status::ILLEGAL_ARGUMENT, nullptr);
return Void();
}
if (status != Status::OK) {
// Provider will never pass initFailed device to client, so
// this must be a disconnected camera
ALOGE("%s: cannot open camera %s. camera is disconnected!",
__FUNCTION__, mCameraId.c_str());
_hidl_cb(Status::CAMERA_DISCONNECTED, nullptr);
return Void();
} else {
mLock.lock();
ALOGV("%s: Initializing device for camera %d", __FUNCTION__, mCameraIdInt);
session = mSession.promote();
if (session != nullptr && !session->isClosed()) {
ALOGE("%s: cannot open an already opened camera!", __FUNCTION__);
mLock.unlock();
_hidl_cb(Status::CAMERA_IN_USE, nullptr);
return Void();
}
/** Open HAL device */
status_t res;
camera3_device_t *device;
ATRACE_BEGIN("camera3->open");
// 这里就是拿到的驱动 对象封装，然后调用open 打开camera
res = mModule->open(mCameraId.c_str(),
reinterpret_cast<hw_device_t**>(&device));
ATRACE_END();
if (res != OK) {
ALOGE("%s: cannot open camera %s!", __FUNCTION__, mCameraId.c_str());
mLock.unlock();
_hidl_cb(getHidlStatus(res), nullptr);
return Void();
}
/** Cross-check device version */
if (device->common.version < CAMERA_DEVICE_API_VERSION_3_2) {
ALOGE("%s: Could not open camera: "
"Camera device should be at least %x, reports %x instead",
__FUNCTION__,
CAMERA_DEVICE_API_VERSION_3_2,
device->common.version);
device->common.close(&device->common);
mLock.unlock();
_hidl_cb(Status::ILLEGAL_ARGUMENT, nullptr);
return Void();
}
struct camera_info info;
res = mModule->getCameraInfo(mCameraIdInt, &info);
if (res != OK) {
ALOGE("%s: Could not open camera: getCameraInfo failed", __FUNCTION__);
device->common.close(&device->common);
mLock.unlock();
_hidl_cb(Status::ILLEGAL_ARGUMENT, nullptr);
return Void();
}
// 创建了 CameraDeviceSession
session = createSession(
device, info.static_camera_characteristics, callback);
if (session == nullptr) {
ALOGE("%s: camera device session allocation failed", __FUNCTION__);
mLock.unlock();
_hidl_cb(Status::INTERNAL_ERROR, nullptr);
return Void();
}
if (session->isInitFailed()) {
ALOGE("%s: camera device session init failed", __FUNCTION__);
session = nullptr;
mLock.unlock();
_hidl_cb(Status::INTERNAL_ERROR, nullptr);
return Void();
}
mSession = session;
IF_ALOGV() {
session->getInterface()->interfaceChain([](
::android::hardware::hidl_vec<::android::hardware::hidl_string> interfaceChain) {
ALOGV("Session interface chain:");
for (const auto& iface : interfaceChain) {
ALOGV(" %s", iface.c_str());
}
});
}
mLock.unlock();
}
_hidl_cb(status, session->getInterface());
return Void();
}
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