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高通Camx 架构学习笔记

作者：盐析白兔 | 2024-05-20 05:16:08

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camx

418a7ac46685a6e694849c4eed6d99f0.gif

和你一起终身学习，这里是程序员Android

经典好文推荐，通过阅读本文，您将收获以下知识点:

一、Camx 代码结构
二、Camx 编译
三、Camx 代码流程分析
四、Camx 调试

一、Camx 代码结构

目前主流的机型都使用camx架构，这个架构和之前架构的主要区别就是 芯片接口层的代码从hardware/qcom 迁移到 vendor/qcom/proprietary/下面，我们主要关注的camera hal层的源码也是放在vendor/qcom/proprietary/camx/下面。

1.1 camera 相关代码目录

e8471d4332d63d74d889909440a6c4fc.jpeg

二、camx 编译

camx的核心目录是 vendor/qcom/proprietary/camx/src/目录下面：

  1. total 40
  2. drwxrwxr-x 10 lxl lxl 4096  4月  4 10:52 ./
  3. drwxrwxr-x  4 lxl lxl 4096  4月  4 10:52 ../
  4. drwxrwxr-x  3 lxl lxl 4096  4月  4 10:52 chiiqutils/
  5. drwxrwxr-x  7 lxl lxl 4096  4月  4 10:56 core/
  6. drwxrwxr-x  7 lxl lxl 4096  4月  4 10:52 csl/
  7. drwxrwxr-x 14 lxl lxl 4096  4月  4 10:52 hwl/
  8. drwxrwxr-x  3 lxl lx 4096  4月  4 10:52 lib/
  9. drwxrwxr-x  3 lxl lxl 4096  4月  4 10:52 osutils/
  10. drwxrwxr-x 11 lxl lxl 4096  4月  4 10:52 swl/
  11. drwxrwxr-x  3 lxl lxl 4096  4月  4 10:52 utils/

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

  1. # Libraries to link
  2. LOCAL_STATIC_LIBRARIES :=   \
  3.     libcamxcore             \
  4.     libcamxchi              \
  5.     libcamxcsl              \
  6.     libcamxofflinestats     \
  7.     libnc                   \
  8.     libcamxncs              \
  9.     libifestriping          \
  10.     libstriping
  11.  
  12. LOCAL_WHOLE_STATIC_LIBRARIES := \
  13.     libcamxdspstreamer          \
  14.     libcamxhwlbps               \
  15.     libcamxgenerated            \
  16.     libcamxhal                  \
  17.     libcamxhalutils             \
  18.     libcamxhwlfd                \
  19.     libcamxhwlife               \
  20.     libcamxhwlipe               \
  21.     libcamxhwliqmodule          \
  22.     libcamxswlfdmanager         \
  23.     libcamxswljpeg              \
  24.     libcamxhwljpeg              \
  25.     libcamxhwllrme              \
  26.     libcamxswlransac            \
  27.     libcamxhwltitan17x          \
  28.     libcamxiqsetting            \
  29.     libcamxosutils              \
  30.     libcamxstats                \
  31.     libcamxsensor               \
  32.     libcamxutils

这些静态库都是camx或者其他的目录下编译的，编译工程的时候，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中如何实现到camera hal层的跳跃，camera service调用到camera provider中的接口方法，现在调用到 camera provider中的 hardware/interfaces/camera/device/3.2/default/CameraDeviceSession.cpp中的processCaptureRequest(...)方法，最终会调用到：

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

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

  1. typedef struct camera3_device_ops {
  2.     int (*initialize)(const struct camera3_device *,
  3.             const camera3_callback_ops_t *callback_ops);
  4.     int (*configure_streams)(const struct camera3_device *,
  5.             camera3_stream_configuration_t *stream_list);
  6.     int (*register_stream_buffers)(const struct camera3_device *,
  7.             const camera3_stream_buffer_set_t *buffer_set);
  8.     const camera_metadata_t* (*construct_default_request_settings)(
  9.             const struct camera3_device *,
  10.             int type);
  11.     int (*process_capture_request)(const struct camera3_device *,
  12.             camera3_capture_request_t *request);
  13.     void (*get_metadata_vendor_tag_ops)(const struct camera3_device*,
  14.             vendor_tag_query_ops_t* ops);
  15.     void (*dump)(const struct camera3_device *, int fd);
  16.     int (*flush)(const struct camera3_device *);
  17.  
  18.     /* reserved for future use */
  19.     void *reserved[8];
  20. } camera3_device_ops_t;

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

  1. const camera3_device_ops_t Camera::sOps = {
  2.     .initialize = default_camera_hal::initialize,
  3.     .configure_streams = default_camera_hal::configure_streams,
  4.     .register_stream_buffers = default_camera_hal::register_stream_buffers,
  5.     .construct_default_request_settings
  6.         = default_camera_hal::construct_default_request_settings,
  7.     .process_capture_request = default_camera_hal::process_capture_request,
  8.     .get_metadata_vendor_tag_ops = NULL,
  9.     .dump = default_camera_hal::dump,
  10.     .flush = default_camera_hal::flush,
  11.     .reserved = {0},
  12. };

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);：

  1. /// Array containing camera3_device_ops_t methods
  2. static camera3_device_ops_t g_camera3DeviceOps =
  3. {
  4.     CamX::initialize,
  5.     CamX::configure_streams,
  6.     NULL,
  7.     CamX::construct_default_request_settings,
  8.     CamX::process_capture_request,
  9.     NULL,
  10.     CamX::dump,
  11.     CamX::flush,
  12.     {0},
  13. };

定义了g_camera3DeviceOps变量：

  1. /// Array containing camera3_device_ops_t methods
  2. static camera3_device_ops_t g_camera3DeviceOps =
  3. {
  4.     CamX::initialize,
  5.     CamX::configure_streams,
  6.     NULL,
  7.     CamX::construct_default_request_settings,
  8.     CamX::process_capture_request,
  9.     NULL,
  10.     CamX::dump,
  11.     CamX::flush,
  12.     {0},
  13. };

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

  1. CamxResult HALDevice::Initialize(
  2.     const HwModule* pHwModule,
  3.     UINT32          cameraId)
  4. {
  5.     CamxResult result = CamxResultSuccess;
  6.  
  7.     m_cameraId = cameraId;
  8.  
  9.     if (CamxResultSuccess == result)
  10.     {
  11.         m_camera3Device.hwDevice.tag     = HARDWARE_DEVICE_TAG; /// @todo (CAMX-351) Get from local macro
  12.         m_camera3Device.hwDevice.version = CAMERA_DEVICE_API_VERSION_3_3;
  13.         m_camera3Device.hwDevice.close   = reinterpret_cast<CloseFunc>(GetHwDeviceCloseFunc());
  14.         m_camera3Device.pDeviceOps       = reinterpret_cast<Camera3DeviceOps*>(GetCamera3DeviceOps());
  15.         m_camera3Device.pPrivateData     = this;
  16.         // NOWHINE CP036a: Need exception here
  17.         m_camera3Device.hwDevice.pModule = const_cast<HwModule*>(pHwModule);
  18.  
  19.         m_HALCallbacks.ProcessCaptureResult = ProcessCaptureResult;
  20.         m_HALCallbacks.NotifyResult         = Notify;
  21.         CamX::ChiOverrideBypass(&m_HALCallbacks);
  22.     }
  23.  
  24.     m_pHALSession = NULL;
  25.     Utils::Memset(m_flushRequest, 0, sizeof(m_flushRequest));
  26.  
  27.     return result;
  28. }

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

  1.  
  2. // Jump table for HAL3
  3.  
  4. JumpTableHAL3 g_jumpTableHAL3 =
  5. {
  6.     open,
  7.     get_number_of_cameras,
  8.     get_camera_info,
  9.     set_callbacks,
  10.     get_vendor_tag_ops,
  11.     open_legacy,
  12.     set_torch_mode,
  13.     init,
  14.     parallelQuery,
  15.     setCallBack,
  16.     get_tag_count,
  17.     get_all_tags,
  18.     get_section_name,
  19.     get_tag_name,
  20.     get_tag_type,
  21.     close,
  22.     initialize,
  23.     configure_streams,
  24.     construct_default_request_settings,
  25.     process_capture_request,
  26.     dump,
  27.     flush,
  28.     camera_device_status_change,
  29.     torch_mode_status_change,
  30.     process_capture_result,
  31.     notify
  32. };

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结构体，如下：

  1. struct CHIAppCallbacks
  2. {
  3.     /// @brief Called by the driver to get number of cameras
  4.     INT(*CHIGetNumCameras)(
  5.         UINT32* pNumFwCameras,
  6.         UINT32* pNumLogicalCameras);
  7.  
  8.     /// @brief Called by the driver to get the camera info for the camera id
  9.     CamxResult (*CHIGetCameraInfo)(
  10.         UINT32      cameraId,
  11.         CameraInfo* pCameraInfo);
  12.  
  13.     /// @brief Defines the prototype for the device status change callback method from to the framework. Please refer to
  14.     ///        the camera_device_status_change documentation in hardware/camera_common.h.
  15.     VOID (*CHIInitializeOverrideSession)(
  16.         UINT32               cameraId,
  17.         const Camera3Device* pCamera3Device,
  18.         const HALCallbacks*  pHALCallbacks,
  19.         Camera3StreamConfig* pStreamConfig,
  20.         BOOL*                isOverrideEnabled,
  21.         VOID**               ppPrivate);
  22.  
  23.     /// @brief Defines the prototype for the torch mode status change callback method from to the framework. Please refer to
  24.     ///        the torch_mode_status_change documentation in hardware/camera_common.h.
  25.     VOID (*CHIFinalizeOverrideSession)(
  26.         const Camera3Device* pCamera3Device,
  27.         UINT64*              pSession,
  28.         VOID**               ppPrivate);
  29.  
  30.     /// @brief Called by the driver to inform about session closing
  31.     VOID (*CHITeardownOverrideSession)(
  32.         const Camera3Device* pCamera3Device,
  33.         UINT64*              pSession,
  34.         VOID*                pPrivate);
  35.  
  36.     /// @brief Called by the driver to pass on capture request call to CHI
  37.     INT (*CHIOverrideProcessRequest)(
  38.         const Camera3Device*    pCamera3Device,
  39.         Camera3CaptureRequest*  pCaptureRequest,
  40.         VOID*                   pPrivate);
  41.  
  42.     /// @brief Called by the driver to allow for additional override processing during open()
  43.     INT(*CHIExtendOpen)(
  44.         UINT32  cameraId,
  45.         VOID*   pPrivateData);
  46.  
  47.     /// @brief Called by the driver to allow for additional override processing during close()
  48.     INT(*CHIExtendClose)(
  49.         UINT32  cameraId,
  50.         VOID*   pPrivateData);
  51.  
  52.     /// @brief Called by the driver to allow override to remap special camera IDs into logical camera IDs
  53.     UINT32(*CHIRemapCameraId)(
  54.         UINT32              frameworkCameraId,
  55.         CameraIdRemapMode   mode);
  56.  
  57.     /// @brief Interface to allow various override-specific settings to be toggled.
  58.     UINT32(*CHIModifySettings)(
  59.         VOID*   pPrivateData);
  60.  
  61.     /// @brief Get any vendor tag specific request settings the override wants to get added to the default settings
  62.     VOID (*CHIGetDefaultRequestSettings)(
  63.         UINT32           frameworkCameraId,
  64.         INT              requestTemplate,
  65.         const Metadata** pAdditionalMetadata);
  66.  
  67.     /// @brief Called by the driver to allow for flush()
  68.     INT(*CHIOverrideFlush)(
  69.         const Camera3Device*    pCamera3Device);
  70.     INT(*CHIParallelQuery) (INT num, char* list[]);
  71.     INT(*CHISetCallback) (void*);
  72.  
  73. };
  74.  
  75. typedef VOID(*CHIHALOverrideEntry)(CHIAppCallbacks* pCHIAppCallbacks);

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

CHIAppCallbacks       m_ChiAppCallbacks;                    ///< CHI HAL override entry

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：

  1. CHIHALOverrideEntry funcCHIHALOverrideEntry =
  2.     reinterpret_cast<CHIHALOverrideEntry>(
  3.         CamX::OsUtils::LibGetAddr(m_hChiOverrideModuleHandle, "chi_hal_override_entry"));
  4.  
  5. if (NULL != funcCHIHALOverrideEntry)
  6. {
  7.     funcCHIHALOverrideEntry(&m_ChiAppCallbacks); //对应到 chxextensioninterface.cpp 中的chi_hal_override_entry函数
  8.  
  9.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIGetNumCameras);
  10.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIGetCameraInfo);
  11.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIFinalizeOverrideSession);
  12.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIInitializeOverrideSession);
  13.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIOverrideProcessRequest);
  14.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIOverrideFlush);
  15.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHITeardownOverrideSession);
  16.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIExtendOpen);
  17.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIExtendClose);
  18.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIRemapCameraId);
  19.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIModifySettings);
  20.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIParallelQuery);
  21.     CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHISetCallback);
  22.  
  23.     if ((NULL != m_ChiAppCallbacks.CHIGetNumCameras)             &&
  24.         (NULL != m_ChiAppCallbacks.CHIGetCameraInfo)             &&
  25.         (NULL != m_ChiAppCallbacks.CHIFinalizeOverrideSession)   &&
  26.         (NULL != m_ChiAppCallbacks.CHIInitializeOverrideSession) &&
  27.         (NULL != m_ChiAppCallbacks.CHIOverrideProcessRequest)    &&
  28.         (NULL != m_ChiAppCallbacks.CHIOverrideFlush)             &&
  29.         (NULL != m_ChiAppCallbacks.CHITeardownOverrideSession)   &&
  30.         (NULL != m_ChiAppCallbacks.CHIExtendOpen)                &&
  31.         (NULL != m_ChiAppCallbacks.CHIExtendClose)               &&
  32.         (NULL != m_ChiAppCallbacks.CHIRemapCameraId)             &&
  33.         (NULL != m_ChiAppCallbacks.CHIModifySettings)            &&
  34.         (NULL != m_ChiAppCallbacks.CHIParallelQuery)             &&
  35.         (NULL != m_ChiAppCallbacks.CHISetCallback))
  36.     {
  37.         CAMX_LOG_WARN(CamxLogGroupHAL, "CHI Module library function pointers exchanged");
  38.     }
  39. }

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：

  1. void chi_hal_override_entry(
  2.     chi_hal_callback_ops_t* callbacks)
  3. {
  4.     ExtensionModule* pExtensionModule = ExtensionModule::GetInstance();
  5.  
  6.     CHX_ASSERT(NULL != callbacks);
  7.  
  8.     if (NULL != pExtensionModule)
  9.     {
  10.         callbacks->chi_get_num_cameras              = chi_get_num_cameras;
  11.         callbacks->chi_get_camera_info              = chi_get_camera_info;
  12.         callbacks->chi_initialize_override_session  = chi_initialize_override_session;
  13.         callbacks->chi_finalize_override_session    = chi_finalize_override_session;
  14.         callbacks->chi_override_process_request     = chi_override_process_request;
  15.         callbacks->chi_teardown_override_session    = chi_teardown_override_session;
  16.         callbacks->chi_extend_open                  = chi_extend_open;
  17.         callbacks->chi_extend_close                 = chi_extend_close;
  18.         callbacks->chi_remap_camera_id              = chi_remap_camera_id;
  19.         callbacks->chi_modify_settings              = chi_modify_settings;
  20.         callbacks->chi_get_default_request_settings = chi_get_default_request_settings;
  21.         callbacks->chi_override_flush               = chi_override_flush;
  22.         callbacks->chi_parallelquery                = chi_parallelquery;
  23.         callbacks->chi_setcallback                  = chi_setcallback;
  24.     }
  25. }

这样就建立了 CHIAppCallbacks 中函数指针的一一映射关系。

d62d96252f127aa7ea7d2d90ea3f0469.jpeg

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：

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

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

  1. Usecase* UsecaseFactory::CreateUsecaseObject(
  2.     LogicalCameraInfo*              pLogicalCameraInfo,     ///< camera info
  3.     UsecaseId                       usecaseId,              ///< Usecase Id
  4.     camera3_stream_configuration_t* pStreamConfig)          ///< Stream config
  5. {
  6.     Usecase* pUsecase  = NULL;
  7.     UINT     camera0Id = pLogicalCameraInfo->ppDeviceInfo[0]->cameraId;
  8.     CHX_LOG_ERROR("UsecaseFactory::CreateUsecaseObject id = %d", usecaseId);
  9.     switch (usecaseId)
  10.     {
  11.         case UsecaseId::PreviewZSL:
  12.             pUsecase = AdvancedCameraUsecase::Create(pLogicalCameraInfo, pStreamConfig, usecaseId);
  13.             break;
  14.         case UsecaseId::MultiCamera:
  15.             pUsecase = UsecaseMultiCamera::Create(pLogicalCameraInfo, pStreamConfig);
  16.             break;
  17.         case UsecaseId::MultiCameraVR:
  18.             pUsecase = UsecaseMultiVRCamera::Create(pLogicalCameraInfo, pStreamConfig);
  19.             break;
  20.         case UsecaseId::MFNR:
  21.             pUsecase = UsecaseMFNR::Create(camera0Id, pStreamConfig);
  22.             break;
  23.         case UsecaseId::QuadCFA:
  24.             pUsecase = UsecaseQuadCFA::Create(pLogicalCameraInfo, pStreamConfig);
  25.             break;
  26.         case UsecaseId::Torch:
  27.             pUsecase = UsecaseTorch::Create(camera0Id, pStreamConfig);
  28.             break;
  29.         default:
  30.             pUsecase = AdvancedCameraUsecase::Create(pLogicalCameraInfo, pStreamConfig, usecaseId);
  31.             break;
  32.     }
  33.  
  34.     return pUsecase;
  35. }
  1. enum class UsecaseId
  2. {
  3.     NoMatch         = 0,
  4.     Default         = 1,
  5.     Preview         = 2,
  6.     PreviewZSL      = 3,
  7.     MFNR            = 4,
  8.     MFSR            = 5,
  9.     MultiCamera     = 6,
  10.     QuadCFA         = 7,
  11.     RawJPEG         = 8,
  12.     MultiCameraVR   = 9,
  13.     Torch           = 10,
  14.     YUVInBlobOut    = 11,
  15.     MaxUsecases     = 12,
  16. };

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

f125fedce56fd9a10acd1d5a31371981.jpeg

camx-usecase

386c268632861d13d4e630e8709ed0b8.jpeg

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

  1.  
  2. /// ChiEntry
  3.  
  4. CAMX_VISIBILITY_PUBLIC VOID ChiEntry(
  5.     ChiContextOps* pChiContextOps)
  6. {
  7.     if (NULL != pChiContextOps)
  8.     {
  9.         pChiContextOps->size                       = sizeof(ChiContextOps);
  10.  
  11.         pChiContextOps->majorVersion               = CHI_API_MAJOR_VERSION;
  12.         pChiContextOps->minorVersion               = CHI_API_MINOR_VERSION;
  13.         pChiContextOps->pOpenContext               = CamX::ChiOpenContext;
  14.         pChiContextOps->pCloseContext              = CamX::ChiCloseContext;
  15.         pChiContextOps->pGetNumCameras             = CamX::ChiGetNumCameras;
  16.         pChiContextOps->pGetCameraInfo             = CamX::ChiGetCameraInfo;
  17.         pChiContextOps->pEnumerateSensorModes      = CamX::ChiEnumerateSensorModes;
  18.         pChiContextOps->pCreatePipelineDescriptor  = CamX::ChiCreatePipelineDescriptor;
  19.         pChiContextOps->pDestroyPipelineDescriptor = CamX::ChiDestroyPipelineDescriptor;
  20.         pChiContextOps->pCreateSession             = CamX::ChiCreateSession;
  21.         pChiContextOps->pDestroySession            = CamX::ChiDestroySession;
  22.         pChiContextOps->pFlushSession              = CamX::ChiFlushSession;
  23.         pChiContextOps->pActivatePipeline          = CamX::ChiActivatePipeline;
  24.         pChiContextOps->pDeactivatePipeline        = CamX::ChiDeactivatePipeline;
  25.         pChiContextOps->pSubmitPipelineRequest     = CamX::ChiSubmitPipelineRequest;
  26.         pChiContextOps->pTagOps                    = CamX::ChiGetTagOps;
  27.     }
  28.  
  29.     // This is the workaround for presil HAL3test on Windows
  30.     // On Device, set_camera_metadata_vendor_ops will be call the set the
  31.     // static vendor tag operation in camera_metadata.c
  32.     //
  33.     // On Windows side, theoretically hal3test should mimic what Android framework
  34.     // does and call the set_camera_metadata_vendor_ops function in libcamxext library
  35.     // However, in Windows, if both hal3test.exe and hal.dll link to libcamxext library,
  36.     // there are two different instance of static varibles sit in different memory location.
  37.     // Even if set_camera_metadata_vendor_ops is called in hal3test, when hal try to
  38.     // access to vendor tag ops, it is still not set.
  39.     //
  40.     // This is also a workaround to call vendor tag ops in Chi at GetNumCameras which happens to get called before
  41.     // GetVendorTagOps
  42.     CamX::g_vendorTagOps.get_all_tags     = CamX::ChiGetAllTags;
  43.     CamX::g_vendorTagOps.get_section_name = CamX::ChiGetSectionName;
  44.     CamX::g_vendorTagOps.get_tag_count    = CamX::ChiGetTagCount;
  45.     CamX::g_vendorTagOps.get_tag_name     = CamX::ChiGetTagName;
  46.     CamX::g_vendorTagOps.get_tag_type     = CamX::ChiGetTagType;
  47.  
  48.     set_camera_metadata_vendor_ops(&(CamX::g_vendorTagOps));
  49. }

这个函数映射关系很重要，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：

8ac3f8a2d68f6be7b106a0cf963813c5.jpeg

　check这段流程的时候我们最关注应该是5个重要的处理类型：

  • 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针对不同的stream来建立不同的usecase对象，用来管理选择feature，并且创建 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请求，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中非常重要的一个父类，是camx中处理camera 请求的一个中间节点，用于处理pipeline下发的请求，下面有类图介绍，比较重要**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，使用pipeline处理请求。

注： Node 节点在camx chi架构中至关重要，数据的处理都是通过封装好的Node节点来进行的。

1e9c500f2b66599748f76ca20e6a4516.jpeg


　　camxnode结构图：

1ec4e413e3404b276c000eafffe55f72.jpeg


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

  1. Node* Titan17xFactory::HwCreateNode(
  2.     const NodeCreateInputData* pCreateInputData,
  3.     NodeCreateOutputData*      pCreateOutputData
  4.     ) const
  5. {
  6.     Node* pNode = NULL;
  7.  
  8.     switch (pCreateInputData->pNodeInfo->nodeId)
  9.     {
  10.         case AutoFocus:
  11.             pNode = AutoFocusNode::Create(pCreateInputData, pCreateOutputData);
  12.             break;
  13.         case BPS:
  14.             pNode = BPSNode::Create(pCreateInputData, pCreateOutputData);
  15.             break;
  16.         case IFE:
  17.             pNode = IFENode::Create(pCreateInputData, pCreateOutputData);
  18.             break;
  19.         case IPE:
  20.             pNode = IPENode::Create(pCreateInputData, pCreateOutputData);
  21.             break;
  22.         case Sensor:
  23.             pNode = SensorNode::Create(pCreateInputData, pCreateOutputData);
  24.             break;
  25.         case StatsProcessing:
  26.             pNode = StatsProcessingNode::Create(pCreateInputData, pCreateOutputData);
  27.             break;
  28.         case JPEG:
  29.             pNode = JPEGEncNode::Create(pCreateInputData, pCreateOutputData);
  30.             break;
  31.         case JPEGAggregator:
  32.             pNode = JPEGAggrNode::Create(pCreateInputData, pCreateOutputData);
  33.             break;
  34.         case StatsParse:
  35.             pNode = StatsParseNode::Create(pCreateInputData, pCreateOutputData);
  36.             break;
  37.         case ChiExternalNode:
  38.             pNode = ChiNodeWrapper::Create(pCreateInputData, pCreateOutputData);
  39.             break;
  40.         case FDHw:
  41.             pNode = FDHwNode::Create(pCreateInputData, pCreateOutputData);
  42.             break;
  43.         case FDManager:
  44.             pNode = FDManagerNode::Create(pCreateInputData, pCreateOutputData);
  45.             break;
  46.         case OfflineStats:
  47.             pNode = OfflineStatsNode::Create(pCreateInputData, pCreateOutputData);
  48.             break;
  49.         case Torch:
  50.             pNode = TorchNode::Create(pCreateInputData, pCreateOutputData);
  51.             break;
  52.         case LRME:
  53.             pNode = LRMENode::Create(pCreateInputData, pCreateOutputData);
  54.             break;
  55.         case RANSAC:
  56.             pNode = RANSACNode::Create(pCreateInputData, pCreateOutputData);
  57.             break;
  58.         default:
  59.             CAMX_ASSERT_ALWAYS_MESSAGE("Unexpected node type");
  60.             break;
  61.     }
  62.  
  63.     return pNode;
  64. }

ca470f10ffe465f0ce2bc96879028337.jpeg

camx_feature：

d78948b7fddd603c8f6ddb76d30a7c5d.jpeg

在 vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxadvancedcamerausecase.cpp中的SelectFeatures(...)函数中有这些feature的创建代码。

拍照的场景分为前置和后置，前置是单摄，后置是多摄，前面也有介绍，单摄和多摄使用的usecase是不同:

前置拍照创建的pipeline有：

  1. MiuiZSLSnapshotJpeg at index 0 for session 0, session's pipeline 0, camera id:1
  2. MiuiZSLPreviewRaw at index 1 for session 1, session's pipeline 0, camera id:1
  3. BinningZSLYuv2Jpeg at index 2 for session 2, session's pipeline 0, camera id:1
  4. BinningMerge3YuvCustomTo1Yuv at index 3 for session 3, session's pipeline 0, camera id:1
  5. ZSLSnapshotYUV at index 4 for session 4, session's pipeline 0, camera id:1
  6. AdvancedAsdMeta at index 5 for session 5, session's pipeline 0, camera id:1
  7. SWMFClearShotYuv at index 6 for session 6, session's pipeline 0, camera id:1
  8. BinningZSLSnapshotYUV at index 7 for session 7, session's pipeline 0, camera id:1

后置拍照创建的pipeline有：

  1. BackCameraJpegEncode at index 0 for session 0, session's pipeline 0, camera id:0
  2. MfnrPrefilter at index 1 for session 0, session's pipeline 1, camera id:0
  3. MfnrBlend at index 2 for session 0, session's pipeline 2, camera id:0
  4. MfnrPostFilter at index 3 for session 0, session's pipeline 3, camera id:0
  5. MfnrScale at index 4 for session 0, session's pipeline 4, camera id:0
  6. Merge3YuvCustomTo1Yuv at index 5 for session 1, session's pipeline 0, camera id:0
  7. ZSLSnapshotYUV at index 6 for session 2, session's pipeline 0, camera id:0
  8. ZSLSnapshotYUVAux at index 7 for session 3, session's pipeline 0, camera id:3
  9. SWMFSRYuv at index 8 for session 4, session's pipeline 0, camera id:0
  10. AdvancedAsdMeta at index 9 for session 5, session's pipeline 0, camera id:0

pipeline在camx中的配置文件是：vendor/qcom/proprietary/chi-cdk/vendor/topology/default/titan17x_usecases.xml，编译时会根据此xml的配置生成对应vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\g_pipelines.h，vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\build\android\Android.mk:

  1. ...
  2. $(info $(shell perl $(CAMX_CDK_PATH)/topology/usecaseconverter.pl $(CAMX_VENDOR_PATH)/topology/default/titan17x_usecases.xml $(LOCAL_PATH)/g_pipelines.h))
  3. ...

然后在\vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\chxusecaseutils.cpp中会根据pStreamConfig->num_streams选择到对应的Usecases（g_pipelines.h中定义）：

  1.  
  2. // UsecaseSelector::DefaultMatchingUsecase
  3.  
  4. ChiUsecase* UsecaseSelector::DefaultMatchingUsecase(
  5.     camera3_stream_configuration_t* pStreamConfig)
  6. {
  7. ...
  8. 　　pSelectedUsecase = &pChiTargetUsecases->pChiUsecases[i];
  9. ...
  10.  
  11. }

DefaultMatchingUsecase方法即在\vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\chxadvancedcamerausecase.cpp 被调用：

  1. CDKResult AdvancedCameraUsecase::SelectUsecaseConfig(
  2.     LogicalCameraInfo*              pCameraInfo,   ///< Camera info
  3.     camera3_stream_configuration_t* pStreamConfig)  ///< Stream configuration
  4. {
  5. ...
  6.         m_pChiUsecase = UsecaseSelector::DefaultMatchingUsecase(pStreamConfig);
  7. ...
  8. }

四、Camx 调试log开关

修改\vendor\qcom\proprietary\camx\src\core\camxsettings.xml 设置 log 打印级别，如：

  1. overrideLogLevels=0x1F
  2. logInfoMask=0x40080
  3. logVerboseMask=0x40000

原文链接：https://www.cnblogs.com/blogs-of-lxl/p/10668554.html

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