高通 Camx 架構(gòu)了解下（一）
和你一起終身學習，這里是程序員Android
通過閱讀本文您將收獲以下知識點:
一、camx 代碼結(jié)構(gòu)
二、camx 編譯
三、camx 代碼流程分析
四、camx 調(diào)試
一、camx 代碼結(jié)構(gòu)
目前主流的機型都使用camx架構(gòu)，這個架構(gòu)和之前架構(gòu)的主要區(qū)別就是 芯片接口層的代碼從hardware/qcom 遷移到?vendor/qcom/proprietary/下面，我們主要關(guān)注的camera hal層的源碼也是放在vendor/qcom/proprietary/camx/下面。
二、camx 編譯
camx的核心目錄是?vendor/qcom/proprietary/camx/src/目錄下面：
total 40
drwxrwxr-x 10 lxl lxl 4096 4月 4 10:52 ./
drwxrwxr-x 4 lxl lxl 4096 4月 4 10:52 ../
drwxrwxr-x 3 lxl lxl 4096 4月 4 10:52 chiiqutils/
drwxrwxr-x 7 lxl lxl 4096 4月 4 10:56 core/
drwxrwxr-x 7 lxl lxl 4096 4月 4 10:52 csl/
drwxrwxr-x 14 lxl lxl 4096 4月 4 10:52 hwl/
drwxrwxr-x 3 lxl lx 4096 4月 4 10:52 lib/
drwxrwxr-x 3 lxl lxl 4096 4月 4 10:52 osutils/
drwxrwxr-x 11 lxl lxl 4096 4月 4 10:52 swl/
drwxrwxr-x 3 lxl lxl 4096 4月 4 10:52 utils/
核心的Android.mk在?./lib/build/android/Android.mk?中。
其中包括的靜態(tài)庫如下：
# Libraries to link
LOCAL_STATIC_LIBRARIES := \
libcamxcore \
libcamxchi \
libcamxcsl \
libcamxofflinestats \
libnc \
libcamxncs \
libifestriping \
libstriping
LOCAL_WHOLE_STATIC_LIBRARIES := \
libcamxdspstreamer \
libcamxhwlbps \
libcamxgenerated \
libcamxhal \
libcamxhalutils \
libcamxhwlfd \
libcamxhwlife \
libcamxhwlipe \
libcamxhwliqmodule \
libcamxswlfdmanager \
libcamxswljpeg \
libcamxhwljpeg \
libcamxhwllrme \
libcamxswlransac \
libcamxhwltitan17x \
libcamxiqsetting \
libcamxosutils \
libcamxstats \
libcamxsensor \
libcamxutils
這些靜態(tài)庫都是camx或者其他的目錄下編譯的，編譯工程的時候，我們要先編譯這些靜態(tài)庫，然后編譯camx的動態(tài)庫（/vendor/lib/hw/camera.qcom.so）。
三、camx 代碼流程分析
camera.provider中如何實現(xiàn)到camera hal層的跳躍，camera service調(diào)用到camera provider中的接口方法，現(xiàn)在調(diào)用到 camera provider中的?hardware/interfaces/camera/device/3.2/default/CameraDeviceSession.cpp中的processCaptureRequest(...)方法，最終會調(diào)用到：
status_t ret = mDevice->ops->process_capture_request(mDevice, &halRequest);
這個mDevice->ops 就是?hardware/libhardware/include/hardware/camera3.h中的 camera3_device_ops 結(jié)構(gòu)體：（參考：https://www.jianshu.com/p/099cc3b0ab25）
typedef struct camera3_device_ops {
int (*initialize)(const struct camera3_device *,
const camera3_callback_ops_t *callback_ops);
int (*configure_streams)(const struct camera3_device *,
camera3_stream_configuration_t *stream_list);
int (*register_stream_buffers)(const struct camera3_device *,
const camera3_stream_buffer_set_t *buffer_set);
const camera_metadata_t* (*construct_default_request_settings)(
const struct camera3_device *,
int type);
int (*process_capture_request)(const struct camera3_device *,
camera3_capture_request_t *request);
void (*get_metadata_vendor_tag_ops)(const struct camera3_device*,
vendor_tag_query_ops_t* ops);
void (*dump)(const struct camera3_device *, int fd);
int (*flush)(const struct camera3_device *);
/* reserved for future use */
void *reserved[8];
} camera3_device_ops_t;
camera3_device_ops_t 映射函數(shù)指針操作：?hardware/libhardware/modules/camera/3_0/Camera.cpp
const camera3_device_ops_t Camera::sOps = {
.initialize = default_camera_hal::initialize,
.configure_streams = default_camera_hal::configure_streams,
.register_stream_buffers = default_camera_hal::register_stream_buffers,
.construct_default_request_settings
= default_camera_hal::construct_default_request_settings,
.process_capture_request = default_camera_hal::process_capture_request,
.get_metadata_vendor_tag_ops = NULL,
.dump = default_camera_hal::dump,
.flush = default_camera_hal::flush,
.reserved = {0},
};
這樣找到在camera hal層的函數(shù)指針的映射關(guān)系。
映射到：vendor/qcom/proprietary/camx/src/core/hal/camxhal3entry.cpp中的static Dispatch g_dispatchHAL3(&g_jumpTableHAL3);：
/// Array containing camera3_device_ops_t methods
static camera3_device_ops_t g_camera3DeviceOps =
{
CamX::initialize,
CamX::configure_streams,
NULL,
CamX::construct_default_request_settings,
CamX::process_capture_request,
NULL,
CamX::dump,
CamX::flush,
{0},
};
定義了g_camera3DeviceOps變量：
/// Array containing camera3_device_ops_t methods
static camera3_device_ops_t g_camera3DeviceOps =
{
CamX::initialize,
CamX::configure_streams,
NULL,
CamX::construct_default_request_settings,
CamX::process_capture_request,
NULL,
CamX::dump,
CamX::flush,
{0},
};
并在\vendor\qcom\proprietary\camx\src\core\hal\camxhaldevice.cpp的Initialize方法中通過GetCamera3DeviceOps獲取，建立聯(lián)系：
CamxResult HALDevice::Initialize(
const HwModule* pHwModule,
UINT32 cameraId)
{
CamxResult result = CamxResultSuccess;
m_cameraId = cameraId;
if (CamxResultSuccess == result)
{
m_camera3Device.hwDevice.tag = HARDWARE_DEVICE_TAG; /// @todo (CAMX-351) Get from local macro
m_camera3Device.hwDevice.version = CAMERA_DEVICE_API_VERSION_3_3;
m_camera3Device.hwDevice.close = reinterpret_cast<CloseFunc>(GetHwDeviceCloseFunc());
m_camera3Device.pDeviceOps = reinterpret_cast<Camera3DeviceOps*>(GetCamera3DeviceOps());
m_camera3Device.pPrivateData = this;
// NOWHINE CP036a: Need exception here
m_camera3Device.hwDevice.pModule = const_cast<HwModule*>(pHwModule);
m_HALCallbacks.ProcessCaptureResult = ProcessCaptureResult;
m_HALCallbacks.NotifyResult = Notify;
CamX::ChiOverrideBypass(&m_HALCallbacks);
}
m_pHALSession = NULL;
Utils::Memset(m_flushRequest, 0, sizeof(m_flushRequest));
return result;
}
看一下g_jumpTableHAL3 變量：在?vendor/qcom/proprietary/camx/src/core/hal/camxhal3.cpp?中定義的:
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Jump table for HAL3
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
JumpTableHAL3 g_jumpTableHAL3 =
{
open,
get_number_of_cameras,
get_camera_info,
set_callbacks,
get_vendor_tag_ops,
open_legacy,
set_torch_mode,
init,
parallelQuery,
setCallBack,
get_tag_count,
get_all_tags,
get_section_name,
get_tag_name,
get_tag_type,
close,
initialize,
configure_streams,
construct_default_request_settings,
process_capture_request,
dump,
flush,
camera_device_status_change,
torch_mode_status_change,
process_capture_result,
notify
};
這兒直接構(gòu)成了指針函數(shù)的映射關(guān)系（對應(yīng)camxhaldevice.cpp中的函數(shù)）。vendor/qcom/proprietary/camx/src/core/chi/camxchitypes.h中定義了CHIAppCallbacks結(jié)構(gòu)體，如下：
struct CHIAppCallbacks
{
/// @brief Called by the driver to get number of cameras
INT(*CHIGetNumCameras)(
UINT32* pNumFwCameras,
UINT32* pNumLogicalCameras);
/// @brief Called by the driver to get the camera info for the camera id
CamxResult (*CHIGetCameraInfo)(
UINT32 cameraId,
CameraInfo* pCameraInfo);
/// @brief Defines the prototype for the device status change callback method from to the framework. Please refer to
/// the camera_device_status_change documentation in hardware/camera_common.h.
VOID (*CHIInitializeOverrideSession)(
UINT32 cameraId,
const Camera3Device* pCamera3Device,
const HALCallbacks* pHALCallbacks,
Camera3StreamConfig* pStreamConfig,
BOOL* isOverrideEnabled,
VOID** ppPrivate);
/// @brief Defines the prototype for the torch mode status change callback method from to the framework. Please refer to
/// the torch_mode_status_change documentation in hardware/camera_common.h.
VOID (*CHIFinalizeOverrideSession)(
const Camera3Device* pCamera3Device,
UINT64* pSession,
VOID** ppPrivate);
/// @brief Called by the driver to inform about session closing
VOID (*CHITeardownOverrideSession)(
const Camera3Device* pCamera3Device,
UINT64* pSession,
VOID* pPrivate);
/// @brief Called by the driver to pass on capture request call to CHI
INT (*CHIOverrideProcessRequest)(
const Camera3Device* pCamera3Device,
Camera3CaptureRequest* pCaptureRequest,
VOID* pPrivate);
/// @brief Called by the driver to allow for additional override processing during open()
INT(*CHIExtendOpen)(
UINT32 cameraId,
VOID* pPrivateData);
/// @brief Called by the driver to allow for additional override processing during close()
INT(*CHIExtendClose)(
UINT32 cameraId,
VOID* pPrivateData);
/// @brief Called by the driver to allow override to remap special camera IDs into logical camera IDs
UINT32(*CHIRemapCameraId)(
UINT32 frameworkCameraId,
CameraIdRemapMode mode);
/// @brief Interface to allow various override-specific settings to be toggled.
UINT32(*CHIModifySettings)(
VOID* pPrivateData);
/// @brief Get any vendor tag specific request settings the override wants to get added to the default settings
VOID (*CHIGetDefaultRequestSettings)(
UINT32 frameworkCameraId,
INT requestTemplate,
const Metadata** pAdditionalMetadata);
/// @brief Called by the driver to allow for flush()
INT(*CHIOverrideFlush)(
const Camera3Device* pCamera3Device);
INT(*CHIParallelQuery) (INT num, char* list[]);
INT(*CHISetCallback) (void*);
};
typedef VOID(*CHIHALOverrideEntry)(CHIAppCallbacks* pCHIAppCallbacks);
這個結(jié)構(gòu)體是函數(shù)指針，映射關(guān)系：vendor/qcom/proprietary/camx/src/core/hal/camxhal3module.h中定義了 CHIAppCallbacks m_ChiAppCallbacks;
CHIAppCallbacks m_ChiAppCallbacks; ///< CHI HAL override entry
vendor/qcom/proprietary/camx/src/core/hal/camxhal3module.cpp中的 HAL3Module構(gòu)造函數(shù)中，存在下面的執(zhí)行語句：
CHIHALOverrideEntry funcCHIHALOverrideEntry =
reinterpret_cast<CHIHALOverrideEntry>(
CamX::OsUtils::LibGetAddr(m_hChiOverrideModuleHandle, "chi_hal_override_entry"));
if (NULL != funcCHIHALOverrideEntry)
{
funcCHIHALOverrideEntry(&m_ChiAppCallbacks); //對應(yīng)到 chxextensioninterface.cpp 中的chi_hal_override_entry函數(shù)
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIGetNumCameras);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIGetCameraInfo);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIFinalizeOverrideSession);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIInitializeOverrideSession);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIOverrideProcessRequest);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIOverrideFlush);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHITeardownOverrideSession);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIExtendOpen);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIExtendClose);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIRemapCameraId);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIModifySettings);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHIParallelQuery);
CAMX_ASSERT(NULL != m_ChiAppCallbacks.CHISetCallback);
if ((NULL != m_ChiAppCallbacks.CHIGetNumCameras) &&
(NULL != m_ChiAppCallbacks.CHIGetCameraInfo) &&
(NULL != m_ChiAppCallbacks.CHIFinalizeOverrideSession) &&
(NULL != m_ChiAppCallbacks.CHIInitializeOverrideSession) &&
(NULL != m_ChiAppCallbacks.CHIOverrideProcessRequest) &&
(NULL != m_ChiAppCallbacks.CHIOverrideFlush) &&
(NULL != m_ChiAppCallbacks.CHITeardownOverrideSession) &&
(NULL != m_ChiAppCallbacks.CHIExtendOpen) &&
(NULL != m_ChiAppCallbacks.CHIExtendClose) &&
(NULL != m_ChiAppCallbacks.CHIRemapCameraId) &&
(NULL != m_ChiAppCallbacks.CHIModifySettings) &&
(NULL != m_ChiAppCallbacks.CHIParallelQuery) &&
(NULL != m_ChiAppCallbacks.CHISetCallback))
{
CAMX_LOG_WARN(CamxLogGroupHAL, "CHI Module library function pointers exchanged");
}
}
m_ChiAppCallbacks 通過 funcCHIHALOverrideEntry 映射到 chi_hal_override_entry這個 chi_hal_override_entry 就是指vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxextensioninterface.cpp中的 chi_hal_override_entry 函數(shù)，如下：
void chi_hal_override_entry(
chi_hal_callback_ops_t* callbacks)
{
ExtensionModule* pExtensionModule = ExtensionModule::GetInstance();
CHX_ASSERT(NULL != callbacks);
if (NULL != pExtensionModule)
{
callbacks->chi_get_num_cameras = chi_get_num_cameras;
callbacks->chi_get_camera_info = chi_get_camera_info;
callbacks->chi_initialize_override_session = chi_initialize_override_session;
callbacks->chi_finalize_override_session = chi_finalize_override_session;
callbacks->chi_override_process_request = chi_override_process_request;
callbacks->chi_teardown_override_session = chi_teardown_override_session;
callbacks->chi_extend_open = chi_extend_open;
callbacks->chi_extend_close = chi_extend_close;
callbacks->chi_remap_camera_id = chi_remap_camera_id;
callbacks->chi_modify_settings = chi_modify_settings;
callbacks->chi_get_default_request_settings = chi_get_default_request_settings;
callbacks->chi_override_flush = chi_override_flush;
callbacks->chi_parallelquery = chi_parallelquery;
callbacks->chi_setcallback = chi_setcallback;
}
}
這樣就建立了 CHIAppCallbacks 中函數(shù)指針的一一映射關(guān)系。
vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxextensionmodule.cpp 中的 ExtensionModule::OverrideProcessRequest?函數(shù)中執(zhí)行了?m_pUsecaseFactory->CreateUsecaseObject，如下：
m_pSelectedUsecase[logicalCameraId] =
m_pUsecaseFactory->CreateUsecaseObject(&m_logicalCameraInfo[logicalCameraId],
static_cast<UsecaseId>(m_SelectedUsecaseId[logicalCameraId]),
m_pStreamConfig[logicalCameraId]);
直接調(diào)用到：vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxusecaseutils.cpp中的 UsecaseFactory::CreateUsecaseObject 函數(shù)：
Usecase* UsecaseFactory::CreateUsecaseObject(
LogicalCameraInfo* pLogicalCameraInfo, ///< camera info
UsecaseId usecaseId, ///< Usecase Id
camera3_stream_configuration_t* pStreamConfig) ///< Stream config
{
Usecase* pUsecase = NULL;
UINT camera0Id = pLogicalCameraInfo->ppDeviceInfo[0]->cameraId;
CHX_LOG_ERROR("UsecaseFactory::CreateUsecaseObject id = %d", usecaseId);
switch (usecaseId)
{
case UsecaseId::PreviewZSL:
pUsecase = AdvancedCameraUsecase::Create(pLogicalCameraInfo, pStreamConfig, usecaseId);
break;
case UsecaseId::MultiCamera:
pUsecase = UsecaseMultiCamera::Create(pLogicalCameraInfo, pStreamConfig);
break;
case UsecaseId::MultiCameraVR:
pUsecase = UsecaseMultiVRCamera::Create(pLogicalCameraInfo, pStreamConfig);
break;
case UsecaseId::MFNR:
pUsecase = UsecaseMFNR::Create(camera0Id, pStreamConfig);
break;
case UsecaseId::QuadCFA:
pUsecase = UsecaseQuadCFA::Create(pLogicalCameraInfo, pStreamConfig);
break;
case UsecaseId::Torch:
pUsecase = UsecaseTorch::Create(camera0Id, pStreamConfig);
break;
default:
pUsecase = AdvancedCameraUsecase::Create(pLogicalCameraInfo, pStreamConfig, usecaseId);
break;
}
return pUsecase;
}
enum class UsecaseId
{
NoMatch = 0,
Default = 1,
Preview = 2,
PreviewZSL = 3,
MFNR = 4,
MFSR = 5,
MultiCamera = 6,
QuadCFA = 7,
RawJPEG = 8,
MultiCameraVR = 9,
Torch = 10,
YUVInBlobOut = 11,
MaxUsecases = 12,
};
前置攝像頭的UsecaseId是 PreviewZSL，是單攝，后置攝像頭的UsecaseId是 MultiCamera，是多攝。
camx-usecase
vendor/qcom/proprietary/camx/src/core/chi/camxchi.cpp中的 ChiEntry函數(shù)如下：
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// ChiEntry
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
CAMX_VISIBILITY_PUBLIC VOID ChiEntry(
ChiContextOps* pChiContextOps)
{
if (NULL != pChiContextOps)
{
pChiContextOps->size = sizeof(ChiContextOps);
pChiContextOps->majorVersion = CHI_API_MAJOR_VERSION;
pChiContextOps->minorVersion = CHI_API_MINOR_VERSION;
pChiContextOps->pOpenContext = CamX::ChiOpenContext;
pChiContextOps->pCloseContext = CamX::ChiCloseContext;
pChiContextOps->pGetNumCameras = CamX::ChiGetNumCameras;
pChiContextOps->pGetCameraInfo = CamX::ChiGetCameraInfo;
pChiContextOps->pEnumerateSensorModes = CamX::ChiEnumerateSensorModes;
pChiContextOps->pCreatePipelineDescriptor = CamX::ChiCreatePipelineDescriptor;
pChiContextOps->pDestroyPipelineDescriptor = CamX::ChiDestroyPipelineDescriptor;
pChiContextOps->pCreateSession = CamX::ChiCreateSession;
pChiContextOps->pDestroySession = CamX::ChiDestroySession;
pChiContextOps->pFlushSession = CamX::ChiFlushSession;
pChiContextOps->pActivatePipeline = CamX::ChiActivatePipeline;
pChiContextOps->pDeactivatePipeline = CamX::ChiDeactivatePipeline;
pChiContextOps->pSubmitPipelineRequest = CamX::ChiSubmitPipelineRequest;
pChiContextOps->pTagOps = CamX::ChiGetTagOps;
}
// This is the workaround for presil HAL3test on Windows
// On Device, set_camera_metadata_vendor_ops will be call the set the
// static vendor tag operation in camera_metadata.c
//
// On Windows side, theoretically hal3test should mimic what Android framework
// does and call the set_camera_metadata_vendor_ops function in libcamxext library
// However, in Windows, if both hal3test.exe and hal.dll link to libcamxext library,
// there are two different instance of static varibles sit in different memory location.
// Even if set_camera_metadata_vendor_ops is called in hal3test, when hal try to
// access to vendor tag ops, it is still not set.
//
// This is also a workaround to call vendor tag ops in Chi at GetNumCameras which happens to get called before
// GetVendorTagOps
CamX::g_vendorTagOps.get_all_tags = CamX::ChiGetAllTags;
CamX::g_vendorTagOps.get_section_name = CamX::ChiGetSectionName;
CamX::g_vendorTagOps.get_tag_count = CamX::ChiGetTagCount;
CamX::g_vendorTagOps.get_tag_name = CamX::ChiGetTagName;
CamX::g_vendorTagOps.get_tag_type = CamX::ChiGetTagType;
set_camera_metadata_vendor_ops(&(CamX::g_vendorTagOps));
}
這個函數(shù)映射關(guān)系很重要，也在camx chi中比較常見，直接映射在此文件的CamxChi類中。都是從?vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxextensionmodule.cpp中調(diào)用過來的。
下面是預(yù)覽時capture request 處理流程圖：
check這段流程的時候我們最關(guān)注應(yīng)該是5個重要的處理類型：
1.UseCase
vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxusecase.h上面有介紹類圖。UseCase在camx中很有很多衍生類，這是camx針對不同的stream來建立不同的usecase對象，用來管理選擇feature，并且創(chuàng)建 pipeline以及session。2.ChiFeature
vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxfeature.h， usecase選擇相應(yīng)的feature，關(guān)聯(lián)一組pipeline，收到request請求，根據(jù)request選擇對應(yīng)的feature。3.Node
vendro/qcom/propriatary/camx/src/core/camxnode.h，下面有類圖。Node是camx中非常重要的一個父類，是camx中處理camera 請求的一個中間節(jié)點，用于處理pipeline下發(fā)的請求，下面有類圖介紹，比較重要**的Node子類已經(jīng)標出來了。4.pipeline
一連串node的集合，通過pipeline下發(fā)給各個node處理。5.session
若干個有關(guān)聯(lián)的pipeline的集合，用來管理pipeline，使用pipeline處理請求。
注：Node 節(jié)點在camx chi架構(gòu)中至關(guān)重要，數(shù)據(jù)的處理都是通過封裝好的Node節(jié)點來進行的。
camxnode結(jié)構(gòu)圖：
node節(jié)點的創(chuàng)建地方在
vendor/qcom/proprietary/camx/src/hwl/titian17x/camxtitian17xfactory.cpp
Node* Titan17xFactory::HwCreateNode(
const NodeCreateInputData* pCreateInputData,
NodeCreateOutputData* pCreateOutputData
) const
{
Node* pNode = NULL;
switch (pCreateInputData->pNodeInfo->nodeId)
{
case AutoFocus:
pNode = AutoFocusNode::Create(pCreateInputData, pCreateOutputData);
break;
case BPS:
pNode = BPSNode::Create(pCreateInputData, pCreateOutputData);
break;
case IFE:
pNode = IFENode::Create(pCreateInputData, pCreateOutputData);
break;
case IPE:
pNode = IPENode::Create(pCreateInputData, pCreateOutputData);
break;
case Sensor:
pNode = SensorNode::Create(pCreateInputData, pCreateOutputData);
break;
case StatsProcessing:
pNode = StatsProcessingNode::Create(pCreateInputData, pCreateOutputData);
break;
case JPEG:
pNode = JPEGEncNode::Create(pCreateInputData, pCreateOutputData);
break;
case JPEGAggregator:
pNode = JPEGAggrNode::Create(pCreateInputData, pCreateOutputData);
break;
case StatsParse:
pNode = StatsParseNode::Create(pCreateInputData, pCreateOutputData);
break;
case ChiExternalNode:
pNode = ChiNodeWrapper::Create(pCreateInputData, pCreateOutputData);
break;
case FDHw:
pNode = FDHwNode::Create(pCreateInputData, pCreateOutputData);
break;
case FDManager:
pNode = FDManagerNode::Create(pCreateInputData, pCreateOutputData);
break;
case OfflineStats:
pNode = OfflineStatsNode::Create(pCreateInputData, pCreateOutputData);
break;
case Torch:
pNode = TorchNode::Create(pCreateInputData, pCreateOutputData);
break;
case LRME:
pNode = LRMENode::Create(pCreateInputData, pCreateOutputData);
break;
case RANSAC:
pNode = RANSACNode::Create(pCreateInputData, pCreateOutputData);
break;
default:
CAMX_ASSERT_ALWAYS_MESSAGE("Unexpected node type");
break;
}
return pNode;
}
camx_feature：
在?vendor/qcom/proprietary/chi-cdk/vendor/chioverride/default/chxadvancedcamerausecase.cpp中的SelectFeatures(...)函數(shù)中有這些feature的創(chuàng)建代碼。
拍照的場景分為前置和后置，前置是單攝，后置是多攝，前面也有介紹，單攝和多攝使用的usecase是不同:
前置拍照創(chuàng)建的pipeline有：
MiuiZSLSnapshotJpeg at index 0 for session 0, session's pipeline 0, camera id:1
MiuiZSLPreviewRaw at index 1 for session 1, session's pipeline 0, camera id:1
BinningZSLYuv2Jpeg at index 2 for session 2, session's pipeline 0, camera id:1
BinningMerge3YuvCustomTo1Yuv at index 3 for session 3, session's pipeline 0, camera id:1
ZSLSnapshotYUV at index 4 for session 4, session's pipeline 0, camera id:1
AdvancedAsdMeta at index 5 for session 5, session's pipeline 0, camera id:1
SWMFClearShotYuv at index 6 for session 6, session's pipeline 0, camera id:1
BinningZSLSnapshotYUV at index 7 for session 7, session's pipeline 0, camera id:1
后置拍照創(chuàng)建的pipeline有：
BackCameraJpegEncode at index 0 for session 0, session's pipeline 0, camera id:0
MfnrPrefilter at index 1 for session 0, session's pipeline 1, camera id:0
MfnrBlend at index 2 for session 0, session's pipeline 2, camera id:0
MfnrPostFilter at index 3 for session 0, session's pipeline 3, camera id:0
MfnrScale at index 4 for session 0, session's pipeline 4, camera id:0
Merge3YuvCustomTo1Yuv at index 5 for session 1, session's pipeline 0, camera id:0
ZSLSnapshotYUV at index 6 for session 2, session's pipeline 0, camera id:0
ZSLSnapshotYUVAux at index 7 for session 3, session's pipeline 0, camera id:3
SWMFSRYuv at index 8 for session 4, session's pipeline 0, camera id:0
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，編譯時會根據(jù)此xml的配置生成對應(yīng)vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\g_pipelines.h，vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\build\android\Android.mk:
...
$(info $(shell perl $(CAMX_CDK_PATH)/topology/usecaseconverter.pl $(CAMX_VENDOR_PATH)/topology/default/titan17x_usecases.xml $(LOCAL_PATH)/g_pipelines.h))
...
然后在\vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\chxusecaseutils.cpp中會根據(jù)pStreamConfig->num_streams選擇到對應(yīng)的Usecases（g_pipelines.h中定義）：
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// UsecaseSelector::DefaultMatchingUsecase
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
ChiUsecase* UsecaseSelector::DefaultMatchingUsecase(
camera3_stream_configuration_t* pStreamConfig)
{
...
pSelectedUsecase = &pChiTargetUsecases->pChiUsecases[i];
...
}
DefaultMatchingUsecase方法即在\vendor\qcom\proprietary\chi-cdk\vendor\chioverride\default\chxadvancedcamerausecase.cpp?被調(diào)用：
CDKResult AdvancedCameraUsecase::SelectUsecaseConfig(
LogicalCameraInfo* pCameraInfo, ///< Camera info
camera3_stream_configuration_t* pStreamConfig) ///< Stream configuration
{
...
m_pChiUsecase = UsecaseSelector::DefaultMatchingUsecase(pStreamConfig);
...
}
四、camx 調(diào)試
修改\vendor\qcom\proprietary\camx\src\core\camxsettings.xml?設(shè)置 log 打印級別，如：
overrideLogLevels=0x1F
logInfoMask=0x40080
logVerboseMask=0x40000
原文鏈接：https://www.cnblogs.com/blogs-of-lxl/p/10668554.html
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