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标题: Camera camx hal-架构（一） [打印本页]

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作者: 写过一篇    时间: 2025-3-7 11:59
标题: Camera camx hal-架构（一）
二、camx 编译
=====================================================================
camx的核心目录是 vendor/qcom/proprietary/camx/src/目录下面：

2. total 40
4. drwxrwxr-x 10 lxl lxl 4096  4月  4 10:52 ./
6. drwxrwxr-x  4 lxl lxl 4096  4月  4 10:52 ../
8. drwxrwxr-x  3 lxl lxl 4096  4月  4 10:52 chiiqutils/
10. drwxrwxr-x  7 lxl lxl 4096  4月  4 10:56 core/
12. drwxrwxr-x  7 lxl lxl 4096  4月  4 10:52 csl/
14. drwxrwxr-x 14 lxl lxl 4096  4月  4 10:52 hwl/
16. drwxrwxr-x  3 lxl lx 4096  4月  4 10:52 lib/
18. drwxrwxr-x  3 lxl lxl 4096  4月  4 10:52 osutils/
20. drwxrwxr-x 11 lxl lxl 4096  4月  4 10:52 swl/
22. drwxrwxr-x  3 lxl lxl 4096  4月  4 10:52 utils/

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核心的Android.mk在 ./lib/build/android/Android.mk 中。
其中包罗的静态库如下：

2. # Libraries to link
4. LOCAL_STATIC_LIBRARIES :=   \
6.     libcamxcore             \
8.     libcamxchi              \
10.     libcamxcsl              \
12.     libcamxofflinestats     \
14.     libnc                   \
16.     libcamxncs              \
18.     libifestriping          \
20.     libstriping
24. LOCAL_WHOLE_STATIC_LIBRARIES := \
26.     libcamxdspstreamer          \
28.     libcamxhwlbps               \
30.     libcamxgenerated            \
32.     libcamxhal                  \
34.     libcamxhalutils             \
36.     libcamxhwlfd                \
38.     libcamxhwlife               \
40.     libcamxhwlipe               \
42.     libcamxhwliqmodule          \
44.     libcamxswlfdmanager         \
46.     libcamxswljpeg              \
48.     libcamxhwljpeg              \
50.     libcamxhwllrme              \
52.     libcamxswlransac            \
54.     libcamxhwltitan17x          \
56.     libcamxiqsetting            \
58.     libcamxosutils              \
60.     libcamxstats                \
62.     libcamxsensor               \
64.     libcamxutils

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这些静态库都是camx或者其他的目录下编译的，编译工程的时间，我们要先编译这些静态库，然后编译camx的动态库（/vendor/lib/hw/camera.qcom.so）。
#三、camx 代码流程分析
camera.provider中怎样实现到camera hal层的跳跃，camera service调用到camera provider中的接口方法，如今调用到 camera provider中的 hardware/interfaces/camera/device/3.2/default/CameraDeviceSession.cpp中的processCaptureRequest(...)方法，最终会调用到：

2. 　status_t ret = mDevice->ops->process_capture_request(mDevice, &halRequest);

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这个mDevice->ops 就是 hardware/libhardware/include/hardware/camera3.h中的 camera3_device_ops 布局体： （参考：https://www.jianshu.com/p/099cc3b0ab25）

2. typedef struct camera3_device_ops {
4.     int (*initialize)(const struct camera3_device *,
6.             const camera3_callback_ops_t *callback_ops);
8.     int (*configure_streams)(const struct camera3_device *,
10.             camera3_stream_configuration_t *stream_list);
12.     int (*register_stream_buffers)(const struct camera3_device *,
14.             const camera3_stream_buffer_set_t *buffer_set);
16.     const camera_metadata_t* (*construct_default_request_settings)(
18.             const struct camera3_device *,
20.             int type);
22.     int (*process_capture_request)(const struct camera3_device *,
24.             camera3_capture_request_t *request);
26.     void (*get_metadata_vendor_tag_ops)(const struct camera3_device*,
28.             vendor_tag_query_ops_t* ops);
30.     void (*dump)(const struct camera3_device *, int fd);
32.     int (*flush)(const struct camera3_device *);
36.     /* reserved for future use */
38.     void *reserved[8];
40. } camera3_device_ops_t;

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camera3_device_ops_t 映射函数指针操作： hardware/libhardware/modules/camera/3_0/Camera.cpp

2. const camera3_device_ops_t Camera::sOps = {
4.     .initialize = default_camera_hal::initialize,
6.     .configure_streams = default_camera_hal::configure_streams,
8.     .register_stream_buffers = default_camera_hal::register_stream_buffers,
10.     .construct_default_request_settings
12.         = default_camera_hal::construct_default_request_settings,
14.     .process_capture_request = default_camera_hal::process_capture_request,
16.     .get_metadata_vendor_tag_ops = NULL,
18.     .dump = default_camera_hal::dump,
20.     .flush = default_camera_hal::flush,
22.     .reserved = {0},
24. };

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这样找到在camera hal层的函数指针的映射关系。
映射到：vendor/qcom/proprietary/camx/src/core/hal/camxhal3entry.cpp中的static Dispatch g_dispatchHAL3(&g_jumpTableHAL3);：

2. /// Array containing camera3_device_ops_t methods
4. static camera3_device_ops_t g_camera3DeviceOps =
6. {
8.     CamX::initialize,
10.     CamX::configure_streams,
12.     NULL,
14.     CamX::construct_default_request_settings,
16.     CamX::process_capture_request,
18.     NULL,
20.     CamX::dump,
22.     CamX::flush,
24.     {0},
26. };

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定义了g_camera3DeviceOps变量：

2. /// Array containing camera3_device_ops_t methods
4. static camera3_device_ops_t g_camera3DeviceOps =
6. {
8.     CamX::initialize,
10.     CamX::configure_streams,
12.     NULL,
14.     CamX::construct_default_request_settings,
16.     CamX::process_capture_request,
18.     NULL,
20.     CamX::dump,
22.     CamX::flush,
24.     {0},
26. };

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并在\vendor\qcom\proprietary\camx\src\core\hal\camxhaldevice.cpp的Initialize方法中通过GetCamera3DeviceOps获取，创建联系：

2. CamxResult HALDevice::Initialize(
4.     const HwModule* pHwModule,
6.     UINT32          cameraId)
8. {
10.     CamxResult result = CamxResultSuccess;
14.     m_cameraId = cameraId;
18.     if (CamxResultSuccess == result)
20.     {
22.         m_camera3Device.hwDevice.tag     = HARDWARE_DEVICE_TAG; /// @todo (CAMX-351) Get from local macro
24.         m_camera3Device.hwDevice.version = CAMERA_DEVICE_API_VERSION_3_3;
26.         m_camera3Device.hwDevice.close   = reinterpret_cast<CloseFunc>(GetHwDeviceCloseFunc());
28.         m_camera3Device.pDeviceOps       = reinterpret_cast<Camera3DeviceOps*>(GetCamera3DeviceOps());
30.         m_camera3Device.pPrivateData     = this;
32.         // NOWHINE CP036a: Need exception here
34.         m_camera3Device.hwDevice.pModule = const_cast<HwModule*>(pHwModule);
38.         m_HALCallbacks.ProcessCaptureResult = ProcessCaptureResult;
40.         m_HALCallbacks.NotifyResult         = Notify;
42.         CamX::ChiOverrideBypass(&m_HALCallbacks);
44.     }
48.     m_pHALSession = NULL;
50.     Utils::Memset(m_flushRequest, 0, sizeof(m_flushRequest));
54.     return result;
56. }

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看一下g_jumpTableHAL3 变量：在 vendor/qcom/proprietary/camx/src/core/hal/camxhal3.cpp 中定义的:

4. // Jump table for HAL3
8. JumpTableHAL3 g_jumpTableHAL3 =
10. {
12.     open,
14.     get_number_of_cameras,
16.     get_camera_info,
18.     set_callbacks,
20.     get_vendor_tag_ops,
22.     open_legacy,
24.     set_torch_mode,
26.     init,
28.     parallelQuery,
30.     setCallBack,
32.     get_tag_count,
34.     get_all_tags,
36.     get_section_name,
38.     get_tag_name,
40.     get_tag_type,
42.     close,
44.     initialize,
46.     configure_streams,
48.     construct_default_request_settings,
50.     process_capture_request,
52.     dump,
54.     flush,
56.     camera_device_status_change,
58.     torch_mode_status_change,
60.     process_capture_result,
62.     notify
64. };

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这儿直接构成了指针函数的映射关系（对应camxhaldevice.cpp中的函数）。vendor/qcom/proprietary/camx/src/core/chi/camxchitypes.h中定义了CHIAppCallbacks布局体，如下：

2. struct CHIAppCallbacks
4. {
6.     /// @brief Called by the driver to get number of cameras
8.     INT(*CHIGetNumCameras)(
10.         UINT32* pNumFwCameras,
12.         UINT32* pNumLogicalCameras);
16.     /// @brief Called by the driver to get the camera info for the camera id
18.     CamxResult (*CHIGetCameraInfo)(
20.         UINT32      cameraId,
22.         CameraInfo* pCameraInfo);
26.     /// @brief Defines the prototype for the device status change callback method from to the framework. Please refer to
28.     ///        the camera_device_status_change documentation in hardware/camera_common.h.
30.     VOID (*CHIInitializeOverrideSession)(
32.         UINT32               cameraId,
34.         const Camera3Device* pCamera3Device,
36.         const HALCallbacks*  pHALCallbacks,
38.         Camera3StreamConfig* pStreamConfig,
40.         BOOL*                isOverrideEnabled,
42.         VOID**               ppPrivate);
46.     /// @brief Defines the prototype for the torch mode status change callback method from to the framework. Please refer to
48.     ///        the torch_mode_status_change documentation in hardware/camera_common.h.
50.     VOID (*CHIFinalizeOverrideSession)(
52.         const Camera3Device* pCamera3Device,
54.         UINT64*              pSession,
56.         VOID**               ppPrivate);
60.     /// @brief Called by the driver to inform about session closing
62.     VOID (*CHITeardownOverrideSession)(
64.         const Camera3Device* pCamera3Device,
66.         UINT64*              pSession,
68.         VOID*                pPrivate);
72.     /// @brief Called by the driver to pass on capture request call to CHI
74.     INT (*CHIOverrideProcessRequest)(
76.         const Camera3Device*    pCamera3Device,
78.         Camera3CaptureRequest*  pCaptureRequest,
80.         VOID*                   pPrivate);
84.     /// @brief Called by the driver to allow for additional override processing during open()
86.     INT(*CHIExtendOpen)(
88.         UINT32  cameraId,
90.         VOID*   pPrivateData);
94.     /// @brief Called by the driver to allow for additional override processing during close()
96.     INT(*CHIExtendClose)(
98.         UINT32  cameraId,
100.         VOID*   pPrivateData);
104.     /// @brief Called by the driver to allow override to remap special camera IDs into logical camera IDs
106.     UINT32(*CHIRemapCameraId)(
108.         UINT32              frameworkCameraId,
110.         CameraIdRemapMode   mode);
114.     /// @brief Interface to allow various override-specific settings to be toggled.
116.     UINT32(*CHIModifySettings)(
118.         VOID*   pPrivateData);
122.     /// @brief Get any vendor tag specific request settings the override wants to get added to the default settings
124.     VOID (*CHIGetDefaultRequestSettings)(
126.         UINT32           frameworkCameraId,
128.         INT              requestTemplate,
130.         const Metadata** pAdditionalMetadata);
134.     /// @brief Called by the driver to allow for flush()
136.     INT(*CHIOverrideFlush)(
138.         const Camera3Device*    pCamera3Device);
140.     INT(*CHIParallelQuery) (INT num, char* list[]);
142.     INT(*CHISetCallback) (void*);
146. };
150. typedef VOID(*CHIHALOverrideEntry)(CHIAppCallbacks* pCHIAppCallbacks);

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这个布局体是函数指针，映射关系：vendor/qcom/proprietary/camx/src/core/hal/camxhal3module.h中定义了 CHIAppCallbacks m_ChiAppCallbacks;

2.    CHIAppCallbacks       m_ChiAppCallbacks;                    ///< CHI HAL override entry

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vendor/qcom/proprietary/camx/src/core/hal/camxhal3module.cpp中的 HAL3Module构造函数中，存在下面的执行语句：

2. CHIHALOverrideEntry funcCHIHALOverrideEntry =
4.     reinterpret_cast<CHIHALOverrideEntry>(
6.         CamX::OsUtils::LibGetAddr(m_hChiOverrideModuleHandle, "chi_hal_override_entry"));
10. if (NULL != funcCHIHALOverrideEntry)
12. {
14.     funcCHIHALOverrideEntry(&m_ChiAppCallbacks); //对应到 chxextensioninterface.cpp 中的chi_hal_override_entry函数
18.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIGetNumCameras);
20.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIGetCameraInfo);
22.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIFinalizeOverrideSession);
24.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIInitializeOverrideSession);
26.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIOverrideProcessRequest);
28.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIOverrideFlush);
30.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHITeardownOverrideSession);
32.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIExtendOpen);
34.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIExtendClose);
36.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIRemapCameraId);
38.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIModifySettings);
40.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIParallelQuery);
42.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHISetCallback);
46.     if ((NULL != m_ChiAppCallbacks.CHIGetNumCameras)             &&
48.         (NULL != m_ChiAppCallbacks.CHIGetCameraInfo)             &&
50.         (NULL != m_ChiAppCallbacks.CHIFinalizeOverrideSession)   &&
52.         (NULL != m_ChiAppCallbacks.CHIInitializeOverrideSession) &&
54.         (NULL != m_ChiAppCallbacks.CHIOverrideProcessRequest)    &&
56.         (NULL != m_ChiAppCallbacks.CHIOverrideFlush)             &&
58.         (NULL != m_ChiAppCallbacks.CHITeardownOverrideSession)   &&
60.         (NULL != m_ChiAppCallbacks.CHIExtendOpen)                &&
62.         (NULL != m_ChiAppCallbacks.CHIExtendClose)               &&
64.         (NULL != m_ChiAppCallbacks.CHIRemapCameraId)             &&
66.         (NULL != m_ChiAppCallbacks.CHIModifySettings)            &&
68.         (NULL != m_ChiAppCallbacks.CHIParallelQuery)             &&
70.         (NULL != m_ChiAppCallbacks.CHISetCallback))
72.     {
74.         CAMX_LOG_WARN(CamxLogGroupHAL, "CHI Module library function pointers exchanged");
76.     }
78. }

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m_ChiAppCallbacks 通过 funcCHIHALOverrideEntry 映射到 chi_hal_override_entry这个 chi_hal_override_entry 就是指vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxextensioninterface.cpp中的 chi_hal_override_entry 函数，如下：

2. void chi_hal_override_entry(
4.     chi_hal_callback_ops_t* callbacks)
6. {
8.     ExtensionModule* pExtensionModule = ExtensionModule::GetInstance();
12.     CHX_ASSERT(NULL != callbacks);
16.     if (NULL != pExtensionModule)
18.     {
20.         callbacks->chi_get_num_cameras              = chi_get_num_cameras;
22.         callbacks->chi_get_camera_info              = chi_get_camera_info;
24.         callbacks->chi_initialize_override_session  = chi_initialize_override_session;
26.         callbacks->chi_finalize_override_session    = chi_finalize_override_session;
28.         callbacks->chi_override_process_request     = chi_override_process_request;
30.         callbacks->chi_teardown_override_session    = chi_teardown_override_session;
32.         callbacks->chi_extend_open                  = chi_extend_open;
34.         callbacks->chi_extend_close                 = chi_extend_close;
36.         callbacks->chi_remap_camera_id              = chi_remap_camera_id;
38.         callbacks->chi_modify_settings              = chi_modify_settings;
40.         callbacks->chi_get_default_request_settings = chi_get_default_request_settings;
42.         callbacks->chi_override_flush               = chi_override_flush;
44.         callbacks->chi_parallelquery                = chi_parallelquery;
46.         callbacks->chi_setcallback                  = chi_setcallback;
48.     }
50. }

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这样就创建了 CHIAppCallbacks 中函数指针的逐一映射关系。

vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxextensionmodule.cpp 中的 ExtensionModule::OverrideProcessRequest 函数中执行了 m_pUsecaseFactory->CreateUsecaseObject，如下：

2. m_pSelectedUsecase[logicalCameraId] =
4.             m_pUsecaseFactory->CreateUsecaseObject(&m_logicalCameraInfo[logicalCameraId],
6.                 static_cast<UsecaseId>(m_SelectedUsecaseId[logicalCameraId]),
8.                 m_pStreamConfig[logicalCameraId]);

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直接调用到：vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxusecaseutils.cpp中的 UsecaseFactory::CreateUsecaseObject 函数：

2. Usecase* UsecaseFactory::CreateUsecaseObject(
4.     LogicalCameraInfo*              pLogicalCameraInfo,     ///< camera info
6.     UsecaseId                       usecaseId,              ///< Usecase Id
8.     camera3_stream_configuration_t* pStreamConfig)          ///< Stream config
10. {
12.     Usecase* pUsecase  = NULL;
14.     UINT     camera0Id = pLogicalCameraInfo->ppDeviceInfo[0]->cameraId;
16.     CHX_LOG_ERROR("UsecaseFactory::CreateUsecaseObject id = %d", usecaseId);
18.     switch (usecaseId)
20.     {
22.         case UsecaseId::PreviewZSL:
24.             pUsecase = AdvancedCameraUsecase::Create(pLogicalCameraInfo, pStreamConfig, usecaseId);
26.             break;
28.         case UsecaseId::MultiCamera:
30.             pUsecase = UsecaseMultiCamera::Create(pLogicalCameraInfo, pStreamConfig);
32.             break;
34.         case UsecaseId::MultiCameraVR:
36.             pUsecase = UsecaseMultiVRCamera::Create(pLogicalCameraInfo, pStreamConfig);
38.             break;
40.         case UsecaseId::MFNR:
42.             pUsecase = UsecaseMFNR::Create(camera0Id, pStreamConfig);
44.             break;
46.         case UsecaseId::QuadCFA:
48.             pUsecase = UsecaseQuadCFA::Create(pLogicalCameraInfo, pStreamConfig);
50.             break;
52.         case UsecaseId::Torch:
54.             pUsecase = UsecaseTorch::Create(camera0Id, pStreamConfig);
56.             break;
58.         default:
60.             pUsecase = AdvancedCameraUsecase::Create(pLogicalCameraInfo, pStreamConfig, usecaseId);
62.             break;
64.     }
68.     return pUsecase;
70. }

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2. enum class UsecaseId
4. {
6.     NoMatch         = 0,
8.     Default         = 1,
10.     Preview         = 2,
12.     PreviewZSL      = 3,
14.     MFNR            = 4,
16.     MFSR            = 5,
18.     MultiCamera     = 6,
20.     QuadCFA         = 7,
22.     RawJPEG         = 8,
24.     MultiCameraVR   = 9,
26.     Torch           = 10,
28.     YUVInBlobOut    = 11,
30.     MaxUsecases     = 12,
32. };

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前置摄像头的UsecaseId是 PreviewZSL，是单摄，后置摄像头的UsecaseId是 MultiCamera，是多摄。

camx-usecase

vendor/qcom/proprietary/camx/src/core/chi/camxchi.cpp中的 ChiEntry函数如下：

4. /// ChiEntry
8. CAMX_VISIBILITY_PUBLIC VOID ChiEntry(
10.     ChiContextOps* pChiContextOps)
12. {
14.     if (NULL != pChiContextOps)
16.     {
18.         pChiContextOps->size                       = sizeof(ChiContextOps);
22.         pChiContextOps->majorVersion               = CHI_API_MAJOR_VERSION;
24.         pChiContextOps->minorVersion               = CHI_API_MINOR_VERSION;
26.         pChiContextOps->pOpenContext               = CamX::ChiOpenContext;
28.         pChiContextOps->pCloseContext              = CamX::ChiCloseContext;
30.         pChiContextOps->pGetNumCameras             = CamX::ChiGetNumCameras;
32.         pChiContextOps->pGetCameraInfo             = CamX::ChiGetCameraInfo;
34.         pChiContextOps->pEnumerateSensorModes      = CamX::ChiEnumerateSensorModes;
36.         pChiContextOps->pCreatePipelineDescriptor  = CamX::ChiCreatePipelineDescriptor;
38.         pChiContextOps->pDestroyPipelineDescriptor = CamX::ChiDestroyPipelineDescriptor;
40.         pChiContextOps->pCreateSession             = CamX::ChiCreateSession;
42.         pChiContextOps->pDestroySession            = CamX::ChiDestroySession;
44.         pChiContextOps->pFlushSession              = CamX::ChiFlushSession;
46.         pChiContextOps->pActivatePipeline          = CamX::ChiActivatePipeline;
48.         pChiContextOps->pDeactivatePipeline        = CamX::ChiDeactivatePipeline;
50.         pChiContextOps->pSubmitPipelineRequest     = CamX::ChiSubmitPipelineRequest;
52.         pChiContextOps->pTagOps                    = CamX::ChiGetTagOps;
54.     }
58.     // This is the workaround for presil HAL3test on Windows
60.     // On Device, set_camera_metadata_vendor_ops will be call the set the
62.     // static vendor tag operation in camera_metadata.c
64.     //
66.     // On Windows side, theoretically hal3test should mimic what Android framework
68.     // does and call the set_camera_metadata_vendor_ops function in libcamxext library
70.     // However, in Windows, if both hal3test.exe and hal.dll link to libcamxext library,
72.     // there are two different instance of static varibles sit in different memory location.
74.     // Even if set_camera_metadata_vendor_ops is called in hal3test, when hal try to
76.     // access to vendor tag ops, it is still not set.
78.     //
80.     // This is also a workaround to call vendor tag ops in Chi at GetNumCameras which happens to get called before
82.     // GetVendorTagOps
84.     CamX::g_vendorTagOps.get_all_tags     = CamX::ChiGetAllTags;
86.     CamX::g_vendorTagOps.get_section_name = CamX::ChiGetSectionName;
88.     CamX::g_vendorTagOps.get_tag_count    = CamX::ChiGetTagCount;
90.     CamX::g_vendorTagOps.get_tag_name     = CamX::ChiGetTagName;
92.     CamX::g_vendorTagOps.get_tag_type     = CamX::ChiGetTagType;
96.     set_camera_metadata_vendor_ops(&(CamX::g_vendorTagOps));
98. }

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这个函数映射关系很紧张，也在camx chi中比较常见，直接映射在此文件的CamxChi类中。都是从 vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxextensionmodule.cpp中调用过来的。
下面是预览时capture request 处理流程图：

check这段流程的时间我们最关注应该是5个紧张的处理类型：

• 1.UseCase
  vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxusecase.h上面有介绍类图。UseCase在camx中很有很多衍生类，这是camx针对差别的stream来创建差别的usecase对象，用来管理选择feature，而且创建 pipeline以及session。
  
• 2.ChiFeature
  vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxfeature.h， usecase选择相应的feature，关联一组pipeline，收到request哀求，根据request选择对应的feature。
  
• 3.Node
  vendro/qcom/propriatary/camx/src/core/camxnode.h，下面有类图。Node是camx中非常紧张的一个父类，是camx中处理camera 哀求的一个中间节点，用于处理pipeline下发的哀求，下面有类图介绍，比较紧张**的Node子类已经标出来了。
  
• 4.pipeline
  一连串node的集合，通过pipeline下发给各个node处理。
  
• 5.session
  若干个有关联的pipeline的集合，用来管理pipeline，利用pipeline处理哀求。
  

注： Node 节点在camx chi架构中至关紧张，数据的处理都是通过封装好的Node节点来举行的。

camxnode布局图：

node节点的创建地方在vendor/qcom/proprietary/camx/src/hwl/titian17x/camxtitian17xfactory.cpp

2. Node* Titan17xFactory::HwCreateNode(
4.     const NodeCreateInputData* pCreateInputData,
6.     NodeCreateOutputData*      pCreateOutputData
8.     ) const
10. {
12.     Node* pNode = NULL;
16.     switch (pCreateInputData->pNodeInfo->nodeId)
18.     {
20.         case AutoFocus:
22.             pNode = AutoFocusNode::Create(pCreateInputData, pCreateOutputData);
24.             break;
26.         case BPS:
28.             pNode = BPSNode::Create(pCreateInputData, pCreateOutputData);
30.             break;
32.         case IFE:
34.             pNode = IFENode::Create(pCreateInputData, pCreateOutputData);
36.             break;
38.         case IPE:
40.             pNode = IPENode::Create(pCreateInputData, pCreateOutputData);
42.             break;
44.         case Sensor:
46.             pNode = SensorNode::Create(pCreateInputData, pCreateOutputData);
48.             break;
50.         case StatsProcessing:
52.             pNode = StatsProcessingNode::Create(pCreateInputData, pCreateOutputData);
54.             break;
56.         case JPEG:
58.             pNode = JPEGEncNode::Create(pCreateInputData, pCreateOutputData);
60.             break;
62.         case JPEGAggregator:
64.             pNode = JPEGAggrNode::Create(pCreateInputData, pCreateOutputData);
66.             break;
68.         case StatsParse:
70.             pNode = StatsParseNode::Create(pCreateInputData, pCreateOutputData);
72.             break;
74.         case ChiExternalNode:
76.             pNode = ChiNodeWrapper::Create(pCreateInputData, pCreateOutputData);
78.             break;
80.         case FDHw:
82.             pNode = FDHwNode::Create(pCreateInputData, pCreateOutputData);
84.             break;
86.         case FDManager:
88.             pNode = FDManagerNode::Create(pCreateInputData, pCreateOutputData);

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