天下之事常成于困约，而败于奢靡。这篇文章主要讲述Android : Camera2/HAL3 ????????????相关的知识，希望能为你提供帮助。
???????????????      ????????????      update      ????????????      tst      tap      thread      only      dia     
??????Android O??????Treble?????????
????????? android O ??????????????????????????????????????? CameraProvider ?????????????????? cameraserver ???????????????????????????????????????????????? [email  protected] ???????????? camera HAL???cameraserver?????? HIDL ?????????camera provider???????????????HIDL????????? Android O ??????????????? Treble ????????????????????????????????? service ??? HAL ?????????????????? HAL ???????????????????????????????????? APP ??? Framework ????????? Binder ????????????????????????????????????????????????????????????????????????????????????????????? Local call ????????? Remote call??????????????????
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  cameraserver ??? provider ???????????????????????????????????????????????????????????????
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??????Camera HAL3??????????????????
???1.Camera HAL3 ??????????????????????????????????????????????????????????????????????????????????????????????????????
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  ???2.??? App ??? CameraService???????????????
????????? Application ????????? CameraService??????????????? Android ???????????????????????????App ??????Framework ??????Runtime ???????????????App ??????????????? Framework ??????????????????????????? Framework ??????????????? Binder ???????????? Runtime ??? CameraService ????????????
???????????????????????????????????????????????????????????????
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????????? App ?????????????????????????????????API??????:

• CameraCharacteristics??????????????????????????????????????????????????????CameraManager???getCameraCharacteristics(@NonNull String cameraId)??????????????????
• CameraDevice?????????????????????????????????????????????Camera???
• CameraCaptureSession???Session????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? capture()??????
• CaptureRequest???????????????????????????????????????????????????????????????????????????CaptureRequest??????????????????????????????????????????CameraRequest???????????????????????????
• CaptureResult????????????????????????????????????

??????????????????camera???java?????????

???mCameraManager.openCamera(currentCameraId, stateCallback, backgroundHandler);

??????Camera2??????????????????????????? ??????
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???(1)Framework CameraManager ???/frameworks/base/core/java/android/hardware/camera2/CameraManager.java
??????????????????????????? CameraManager ??? openCamera ???????????????????????????????????????????????????????????? openCameraForUid ?????????

@RequiresPermission(android.Manifest.permission.CAMERA) public void openCamera(@NonNull String cameraId, @NonNull final CameraDevice.StateCallback callback, @Nullable Handler handler) throws CameraAccessException {openCameraForUid(cameraId, callback, handler, USE_CALLING_UID); }

??????????????????????????????????????????????????????????????????????????????????????? openCameraDeviceUserAsync ?????????

public void openCameraForUid(@NonNull String cameraId, @NonNull final CameraDevice.StateCallback callback, @Nullable Handler handler, int clientUid) throws CameraAccessException { /* Do something in*/ ...... /* Do something out*/ openCameraDeviceUserAsync(cameraId, callback, handler, clientUid); }

?????????????????????????????????

private CameraDevice openCameraDeviceUserAsync(String cameraId, CameraDevice.StateCallback callback, Handler handler, final int uid) throws CameraAccessException { CameraCharacteristics characteristics = getCameraCharacteristics(cameraId); CameraDevice device = null; synchronized (mLock) {ICameraDeviceUser cameraUser = null; android.hardware.camera2.impl.CameraDeviceImpl deviceImpl =//??????????????? CameraDeviceImpl????????????????????? CameraDevice.StateCallback ?????? Handler??? new android.hardware.camera2.impl.CameraDeviceImpl( cameraId, callback, handler, characteristics, mContext.getApplicationInfo().targetSdkVersion); ICameraDeviceCallbacks callbacks = deviceImpl.getCallbacks(); //?????? CameraDeviceCallback ??????????????????????????????????????? CameraDeviceImpl ????????????try { if (supportsCamera2ApiLocked(cameraId)) {//HAL3 ????????????????????????????????????????????? CameraManagerGlobal ????????? CameraService ???????????????????????????????????????????????? Binder ????????? connectDevice ?????????????????????????????? ????????????????????????????????????????????????????????????????????????????????????????????????//??????????????? cameraUser ??????????????????????????? CameraDeviceClient ?????????????????? // Use cameraservice???s cameradeviceclient implementation for HAL3.2+ devices ICameraService cameraService = CameraManagerGlobal.get().getCameraService(); if (cameraService == null) { throw new ServiceSpecificException( ICameraService.ERROR_DISCONNECTED, "Camera service is currently unavailable"); } cameraUser = cameraService.connectDevice(callbacks, cameraId, mContext.getOpPackageName(), uid); } else { // Use legacy camera implementation for HAL1 devices int id; try { id = Integer.parseInt(cameraId); } catch (NumberFormatException e) { throw new IllegalArgumentException("Expected cameraId to be numeric, but it was: " + cameraId); }Log.i(TAG, "Using legacy camera HAL."); cameraUser = CameraDeviceUserShim.connectBinderShim(callbacks, id); } } catch (ServiceSpecificException e) { /* Do something in */ ...... /* Do something out */ }// TODO: factor out callback to be non-nested, then move setter to constructor // For now, calling setRemoteDevice will fire initial // onOpened/onUnconfigured callbacks. // This function call may post onDisconnected and throw CAMERA_DISCONNECTED if // cameraUser dies during setup. deviceImpl.setRemoteDevice(cameraUser); //??? CameraDeviceClient ????????? CameraDeviceImpl ?????????????????? device = deviceImpl; }return device; }

???(2)CameraDeviceImpl : /frameworks/base/core/java/android/hardware/camera2/Impl/CameraDeviceImpl.java
????????????????????????????????????????????????????????????????????????????????? CameraDeviceImpl ??????setRemoteDevice ????????????????????????????????????????????????????????????

/** * Set remote device, which triggers initial onOpened/onUnconfigured callbacks * * < p> This function may post onDisconnected and throw CAMERA_DISCONNECTED if remoteDevice dies * during setup.< /p> * */ public void setRemoteDevice(ICameraDeviceUser remoteDevice) throws CameraAccessException { synchronized(mInterfaceLock) { // TODO: Move from decorator to direct binder-mediated exceptions // If setRemoteFailure already called, do nothing if (mInError) return; mRemoteDevice = new ICameraDeviceUserWrapper(remoteDevice); //?????? ICameraDeviceUserWrapper ??????????????????????????????????????????IBinder remoteDeviceBinder = remoteDevice.asBinder(); //?????? Binder ?????????????????????????????? // For legacy camera device, remoteDevice is in the same process, and // asBinder returns NULL. if (remoteDeviceBinder != null) { try { remoteDeviceBinder.linkToDeath(this, /*flag*/ 0); //????????????binder???????????????????????????????????????????????? } catch (RemoteException e) { CameraDeviceImpl.this.mDeviceHandler.post(mCallOnDisconnected); throw new CameraAccessException(CameraAccessException.CAMERA_DISCONNECTED, "The camera device has encountered a serious error"); } }mDeviceHandler.post(mCallOnOpened); //??????????????? onOpened ??? onUnconfigured ?????????????????????????????????????????? mDeviceHandler ???????????????????????????????????? mDeviceHandler.post(mCallOnUnconfigured); } }

??????3???Runtime????????? Binder ?????????????????????????????? connectDevice ???????????? C++ ????????????????????????????????????????????????????????????????????????????????? CameraService ?????????
??????4???CameraService???/frameworks/av/services/camera/libcameraservice/CameraService.cpp

Status CameraService::connectDevice( const sp< hardware::camera2::ICameraDeviceCallbacks> & cameraCb, const String16& cameraId, const String16& clientPackageName, int clientUid, /*out*/ sp< hardware::camera2::ICameraDeviceUser> * device) {ATRACE_CALL(); Status ret = Status::ok(); String8 id = String8(cameraId); sp< CameraDeviceClient> client = nullptr; ?????? //??????????????? connectHelper ???????????????????????????????????????HAL1 ???????????????????????????????????????????????????????????????????????????????????? ICameraDeviceCallbacks ?????? CameraDeviceClient??? ret = connectHelper< hardware::camera2::ICameraDeviceCallbacks,CameraDeviceClient> (cameraCb, id, CAMERA_HAL_API_VERSION_UNSPECIFIED, clientPackageName, clientUid, USE_CALLING_PID, API_2, /*legacyMode*/ false, /*shimUpdateOnly*/ false, /*out*/client); if(!ret.isOk()) { logRejected(id, getCallingPid(), String8(clientPackageName), ret.toString8()); return ret; }*device = client; //client ?????????????????? CameraDeviceClient?????????????????????????????????????????? return ret; }

??????connectHelper ???????????????????????????????????????????????????????????????

template< class CALLBACK, class CLIENT> Status CameraService::connectHelper(const sp< CALLBACK> & cameraCb, const String8& cameraId, int halVersion, const String16& clientPackageName, int clientUid, int clientPid, apiLevel effectiveApiLevel, bool legacyMode, bool shimUpdateOnly, /*out*/sp< CLIENT> & device) { binder::Status ret = binder::Status::ok(); String8 clientName8(clientPackageName); /* Do something in */ ...... /* Do something out */sp< BasicClient> tmp = nullptr; //?????? makeClient ?????? CameraDeviceClient ????????? if(!(ret = makeClient(this, cameraCb, clientPackageName, cameraId, facing, clientPid, clientUid, getpid(), legacyMode, halVersion, deviceVersion, effectiveApiLevel, /*out*/& tmp)).isOk()) { return ret; } //????????? CLIENT ???????????????????????????????????? CLIENT ?????? CameraDeviceClient?????????????????? mCameraProviderManager ????????? HAL service ????????? client = static_cast< CLIENT*> (tmp.get()); LOG_ALWAYS_FATAL_IF(client.get() == nullptr, "%s: CameraService in invalid state", __FUNCTION__); err = client-> initialize(mCameraProviderManager); /* Do something in */ ...... /* Do something out */// Important: release the mutex here so the client can call back into the service from its // destructor (can be at the end of the call) device = client; return ret; }

??????makeClient ??????????????? API ???????????? HAL ?????????????????????????????? Client ?????????Client ????????????????????????????????????????????? CameraDeviceImpl ???????????????????????? mRemoteDevice???

Status 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) {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: /* Do something in */ ...... /* Do something out */ 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: case CAMERA_DEVICE_API_VERSION_3_4: if (effectiveApiLevel == API_1) { // Camera1 API route sp< ICameraClient> tmp = static_cast< ICameraClient*> (cameraCb.get()); *client = new Camera2Client(cameraService, tmp, packageName, cameraIdToInt(cameraId), facing, clientPid, clientUid, servicePid, legacyMode); } else { // Camera2 API route : ???????????? CameraDeviceClient ????????? Client?????????????????????????????? ICameraDeviceCallbacks?????????????????? CameraDeviceImpl ?????????????????? sp< hardware::camera2::ICameraDeviceCallbacks> tmp = static_cast< hardware::camera2::ICameraDeviceCallbacks*> (cameraCb.get()); *client = new CameraDeviceClient(cameraService, tmp, packageName, 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); } } else { /* Do something in */ ...... /* Do something out */ } return Status::ok(); }

?????????????????????????????????????????? App ??? CameraService ??????????????????????????????????????????
??????????????????:
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??????Ps???

• CameraManagerGlobal ?????????????????????????????? JAVA ?????? CameraService ?????????????????????????????????????????????
• CameraDeviceImpl ??????????????????????????????????????? Android N ????????? JNI ??????

???3.??? CameraService ??? HAL Service
???????????? Android O ???????????? Treble ?????????CameraServer ??????????????? CameraService??????????????????????????? Provider service??????????????????????????? CameraProviderManager ??????????????????????????????????????????????????????????????????
????????? Provider service ?????????????????? CameraProvider??????????????????????????????????????? libhardware ??? Camera HAL ?????????????????? CameraModule ??????????????????
???????????????????????????????????? “ ??????” ?????????????????????????????????????????? QCamera3HWI ?????????????????????????????????????????????
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?????????????????????????????????????????????????????????????????????????????????????????????????????????
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?????????????????????????????? CameraService::makeClient ???????????????????????? CameraDeviceClient????????????????????????????????????????????????????????????????????????????????????
??????????????????????????????????????? Runtime ?????????????????? CameraService ??? HAL Service ??????????????????

?????????1???CameraDeviceClient ???frameworksavservicescameralibcameraserviceapi2CameraDeviceClient.cpp

CameraDeviceClient::CameraDeviceClient(const sp< CameraService> & cameraService, const sp< hardware::camera2::ICameraDeviceCallbacks> & remoteCallback, const String16& clientPackageName, const String8& cameraId, int cameraFacing, int clientPid, uid_t clientUid, int servicePid) : Camera2ClientBase(cameraService, remoteCallback, clientPackageName, cameraId, cameraFacing, clientPid, clientUid, servicePid),//?????????????????? Camera2ClientBase mInputStream(), mStreamingRequestId(REQUEST_ID_NONE), mRequestIdCounter(0), mPrivilegedClient(false) {char value[PROPERTY_VALUE_MAX]; property_get("persist.camera.privapp.list", value, ""); String16 packagelist(value); if (packagelist.contains(clientPackageName.string())) { mPrivilegedClient = true; }ATRACE_CALL(); ALOGI("CameraDeviceClient %s: Opened", cameraId.string()); }

??????CameraService ????????? CameraDeviceClient ??????????????????????????????????????????

//?????????????????????????????????????????? initialize??? status_t CameraDeviceClient::initialize(sp< CameraProviderManager> manager) { return initializeImpl(manager); }//??????????????????????????????????????? TProviderPtr ??????????????? CameraProviderManager ?????? template< typename TProviderPtr> //???????????????????????????????????????????????? CameraProviderManager??? status_t CameraDeviceClient::initializeImpl(TProviderPtr providerPtr) { ATRACE_CALL(); status_t res; res = Camera2ClientBase::initialize(providerPtr); if (res != OK) { return res; }//??????????????? FrameProcessor ????????????????????????????????? String8 threadName; mFrameProcessor = new FrameProcessorBase(mDevice); threadName = String8::format("CDU-%s-FrameProc", mCameraIdStr.string()); mFrameProcessor-> run(threadName.string()); mFrameProcessor-> registerListener(FRAME_PROCESSOR_LISTENER_MIN_ID, FRAME_PROCESSOR_LISTENER_MAX_ID, /*listener*/this, /*sendPartials*/true); return OK; }

【Android : Camera2/HAL3 ????????????】 

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