diff --git a/zh-cn/device-dev/driver/driver-peripherals-camera-des.md b/zh-cn/device-dev/driver/driver-peripherals-camera-des.md
index 148726f226c65eaf4a5e3fa7ee09c08ed953c9ff..b74332ad4f6988a36984189ab915c66a0ebfac33 100755
--- a/zh-cn/device-dev/driver/driver-peripherals-camera-des.md
+++ b/zh-cn/device-dev/driver/driver-peripherals-camera-des.md
@@ -1,31 +1,27 @@
-# Camera
+# Camera
-- [Camera](#camera)
- - [概述](#概述)
- - [开发指导](#开发指导)
- - [HDI接口说明](#hdi接口说明)
- - [开发步骤](#开发步骤)
- - [开发实例](#开发实例)
+## 概述
+### 功能简介
+OpenHarmony相机驱动框架模型对上实现相机HDI（Hardware Device Interface）接口，对下实现相机Pipeline模型，管理相机各个硬件设备。
+该驱动框架模型内部分为三层，依次为HDI实现层、框架层和适配层，各层基本概念如下：
-## 概述
++ HDI实现层：对上实现OHOS（OpenHarmony Operation System）相机标准南向接口。
++ 框架层：对接HDI实现层的控制、流的转发，实现数据通路的搭建，管理相机各个硬件设备等功能。
++ 适配层：屏蔽底层芯片和OS（Operation System）差异，支持多平台适配。
-OpenHarmony相机驱动框架模型对上实现相机HDI（Hardware Driver Interface）接口，对下实现相机Pipeline模型，管理相机各个硬件设备。
-该驱动框架模型内部分为三层，依次为HDI实现层、框架层和适配层，各层基本概念如下：
-+ **HDI实现层**：对上实现OHOS（OpenHarmony Operation System）相机标准南向接口。
-
-+ **框架层**：对接HDI实现层的控制、流的转发，实现数据通路的搭建，管理相机各个硬件设备等功能。
+### 运作机制
+
+Camera模块主要包含服务、设备的初始化，数据通路的搭建，流的配置、创建、下发、捕获等，具体运作机制参考以下图文解析：
-+ **适配层**：屏蔽底层芯片和OS（Operation System）差异，支持多平台适配。
+**图 1** 基于HDF驱动框架的Camera驱动模型
-****
-**图 1** 基于HDF驱动框架的Camera驱动模型
-
+ 
1. 系统启动时创建CameraDeviceHost进程。进程创建后，首先枚举底层设备，创建（也可以通过配置表创建）管理设备树的DeviceManager类及其内部各个底层设备的对象，创建对应的CameraHost类实例并且将其注册到UHDF服务中，方便上层通过UHDF服务获取底层CameraDeviceHost的服务，从而操作底层设备。
2. Service通过CameraDeviceHost服务获取CameraHost实例，CameraHost可以获取底层的Camera能力，打开手电筒、调用Open接口打开Camera创建连接、创建DeviceManager（负责底层硬件模块上电）、创建CameraDevice（向上提供设备控制接口）。创建CameraDevice时会实例化PipelineCore的各个子模块，其中StreamPiplineCore负责创建Pipeline，MetaQueueManager负责上报meta。
-
+
3. Service通过底层的CameraDevice配置流、创建Stream类。StreamPipelineStrategy模块通过上层下发的模式和查询配置表创建对应流的Node连接方式，StreamPipelineBuilder模块创建Node实例并且连接返回该Pipline给StreamPipelineDispatcher。StreamPipelineDispatcher提供统一的Pipline调用管理。
4. Service通过Stream控制整个流的操作，AttachBufferQueue接口将从显示模块申请的BufferQueue下发到底层，由CameraDeviceDriverModel自行管理buffer，当Capture接口下发命令后，底层开始向上传递buffer。Pipeline的IspNode依次从BufferQueue获取指定数量buffer，然后下发到底层ISP（Image Signal Processor，图像信号处理器）硬件，ISP填充完之后将buffer传递给CameraDeviceDriverModel，CameraDeviceDriverModel通过循环线程将buffer填充到已经创建好的Pipeline中，各个Node处理后通过回调传递给上层，同时buffer返回BufferQueue等待下一次下发。
@@ -38,635 +34,706 @@ OpenHarmony相机驱动框架模型对上实现相机HDI（Hardware Driver Inter
8. Service调用CameraDevice的Close接口，CameraDevice调用对应的DeviceManager模块对各个硬件下电；如果此时在Ipp的SubPipeline中存在OfflineStream，则需要保留OfflineStream，直到执行完毕。
-9. 动态帧率控制。在StreamOperator中起一个CollectBuffer线程，CollectBuffer线程从每一路stream的BufferQueue中获取buffer，如果某一路流的帧率需要控制（为sensor出帧帧率的1/n），可以根据需求控制每一帧的buffer打包，并决定是否collect此路流的buffer（比如sensor出帧帧率为120fps，预览流的帧率为30fps，CollectBuffer线程collect预览流的buffer时，每隔4fps collect一次）。
-
-## 开发指导
-
-### HDI接口说明
-旨在了解HDI接口的作用及函数参数的传递规则，详情可见[Camera驱动子系统HDI使用说明](https://gitee.com/openharmony/drivers_peripheral/blob/master/camera/README_zh.md)。
-
-
-### 开发步骤
-
-下面分步骤描述了Camera驱动框架的主要接口，包括注册、检测；创建、捕获和销毁流；打开和关闭设备等接口（为了更清晰的展示和描述主要功能的实现部分，该章节删除了部分判错和LOG源码）。
-1. 注册CameraHost
-
- 定义Camera的HdfDriverEntry结构体，该结构体中定义了CameraHost初始化的方法。
-
- ```
- struct HdfDriverEntry g_cameraHostDriverEntry = {
- .moduleVersion = 1,
- .moduleName = "camera_service",
- .Bind = HdfCameraHostDriverBind,
- .Init = HdfCameraHostDriverInit,
- .Release = HdfCameraHostDriverRelease,
- };
- HDF_INIT(g_cameraHostDriverEntry); // 将Camera的HdfDriverEntry结构体注册到HDF上
- ```
-
-2. CameraHost初始化
-
- 步骤1中提到的HdfCameraHostDriverBind接口提供了CameraServiceDispatch和CameraHostStubInstance的注册。这两个接口一个是远端调用CameraHost的方法，如OpenCamera()，SetFlashlight()等，另外一个是Camera设备的初始化，在开机时被调用。
+9. 动态帧率控制。在StreamOperator中起一个CollectBuffer线程，CollectBuffer线程从每一路stream的BufferQueue中获取buffer，如果某一路流的帧率需要控制（为sensor出帧帧率的1/n），可以根据需求控制每一帧的buffer打包，并决定是否collect此路流的buffer（比如sensor出帧帧率为120fps，预览流的帧率为30fps，CollectBuffer线程collect预览流的buffer时，每隔4fps collect一次）。
- ```
- int HdfCameraHostDriverBind(HdfDeviceObject *deviceObject)
- {
- HDF_LOGI("HdfCameraHostDriverBind enter!");
- if (deviceObject == nullptr) {
- HDF_LOGE("HdfCameraHostDriverBind: HdfDeviceObject is NULL !");
- return HDF_FAILURE;
- }
- HdfCameraService *hdfCameraService = reinterpret_cast(OsalMemAlloc(sizeof(HdfCameraService)));
- if (hdfCameraService == nullptr) {
- HDF_LOGE("HdfCameraHostDriverBind OsalMemAlloc HdfCameraService failed!");
- return HDF_FAILURE;
- }
- hdfCameraService->ioservice.Dispatch = CameraServiceDispatch; // 提供远端CameraHost调用方法
- hdfCameraService->ioservice.Open = nullptr;
- hdfCameraService->ioservice.Release = nullptr;
- hdfCameraService->instance = CameraHostStubInstance(); // 初始化Camera设备
- deviceObject->service = &hdfCameraService->ioservice;
- return HDF_SUCCESS;
- }
- ```
-
- 下面的函数是远端CameraHost调用的方法：
-
- ```
- int32_t CameraHostStub::CameraHostServiceStubOnRemoteRequest(int cmdId, MessageParcel &data,
- MessageParcel &reply, MessageOption &option)
- {
- switch(cmdId) {
- case CMD_CAMERA_HOST_SET_CALLBACK: {
- return CameraHostStubSetCallback(data, reply, option);
- }
- case CMD_CAMERA_HOST_GET_CAMERAID: {
- return CameraHostStubGetCameraIds(data, reply, option);
- }
- case CMD_CAMERA_HOST_GET_CAMERA_ABILITY: {
- return CameraHostStubGetCameraAbility(data, reply, option);
- }
- case CMD_CAMERA_HOST_OPEN_CAMERA: {
- return CameraHostStubOpenCamera(data, reply, option);
- }
- case CMD_CAMERA_HOST_SET_FLASH_LIGHT: {
- return CameraHostStubSetFlashlight(data, reply, option);
- }
- default: {
- HDF_LOGE("%s: not support cmd %d", __func__, cmdId);
- return HDF_ERR_INVALID_PARAM;
- }
- }
- return HDF_SUCCESS;
- }
- ```
-
- CameraHostStubInstance()接口最终调用CameraHostImpl::Init()方法，该方法会获取物理Camera，并对DeviceManager和PipelineCore进行初始化。
-
-3. 获取CamerHost
-
- 调用Get()接口从远端CameraService中获取CameraHost对象。get()方法如下：
-
- ```
- sptr ICameraHost::Get(const char *serviceName)
- {
- do {
- using namespace OHOS::HDI::ServiceManager::V1_0;
- auto servMgr = IServiceManager::Get();
- if (servMgr == nullptr) {
- HDF_LOGE("%s: IServiceManager failed!", __func__);
- break;
- }
- auto remote = servMgr->GetService(serviceName); // 根据serviceName名称获取CameraHost
- if (remote != nullptr) {
- sptr hostSptr = iface_cast(remote); // 将CameraHostProxy对象返回给调用者，该对象中包含OpenCamera()等方法。
- return hostSptr;
- }
- HDF_LOGE("%s: GetService failed! serviceName = %s", __func__, serviceName);
- } while(false);
- HDF_LOGE("%s: get %s failed!", __func__, serviceName);
- return nullptr;
- }
- ```
-
-4. OpenCamera()接口
-
- CameraHostProxy对象中有五个方法，分别是SetCallback、GetCameraIds、GetCameraAbility、OpenCamera和SetFlashlight。下面着重描述OpenCamera接口。
- CameraHostProxy的OpenCamera()接口通过CMD_CAMERA_HOST_OPEN_CAMERA调用远端CameraHostStubOpenCamera()接口并获取ICameraDevice对象。
-
- ```
- CamRetCode CameraHostProxy::OpenCamera(const std::string &cameraId, const OHOS::sptr &callback, OHOS::sptr &pDevice)
- {
- int32_t ret = Remote()->SendRequest(CMD_CAMERA_HOST_REMOTE_OPEN_CAMERA, data, reply, option);
- if (ret != HDF_SUCCESS) {
- HDF_LOGE("%{public}s: SendRequest failed, error code is %{public}d", __func__, ret);
- return INVALID_ARGUMENT;
- }
- CamRetCode retCode = static_cast(reply.ReadInt32());
- bool flag = reply.ReadBool();
- if (flag) {
- sptr remoteCameraDevice = reply.ReadRemoteObject();
- if (remoteCameraDevice == nullptr) {
- HDF_LOGE("%{public}s: CameraHostProxy remoteCameraDevice is null", __func__);
- }
- pDevice = OHOS::iface_cast(remoteCameraDevice);
- }
- return retCode;
- }
- ```
-
- Remote()->SendRequest调用上文提到的CameraHostServiceStubOnRemoteRequest()，根据cmdId进入CameraHostStubOpenCamera()接口，最终调用CameraHostImpl::OpenCamera()，该接口获取了CameraDevice并对硬件进行上电等操作。
-
- ```
- CamRetCode CameraHostImpl::OpenCamera(const std::string &cameraId, const OHOS::sptr &callback, OHOS::sptr &device)
- {
- std::shared_ptr cameraDevice = std::static_pointer_cast(itr->second);
- if (cameraDevice == nullptr) {
- CAMERA_LOGE("camera device is null.");
- return INSUFFICIENT_RESOURCES;
- }
- CamRetCode ret = cameraDevice->SetCallback(callback);
- if (ret != NO_ERROR) {
- CAMERA_LOGW("set camera device callback faild.");
- return ret;
- }
- CameraHostConfig *config = CameraHostConfig::GetInstance();
- if (config == nullptr) {
- return INVALID_ARGUMENT;
- }
- std::vector phyCameraIds;
- RetCode rc = config->GetPhysicCameraIds(cameraId, phyCameraIds);
- if (rc != RC_OK) {
- CAMERA_LOGE("get physic cameraId failed.");
- return DEVICE_ERROR;
- }
- if (CameraPowerUp(cameraId, phyCameraIds) != RC_OK) { // 对Camera硬件上电
- CAMERA_LOGE("camera powerup failed.");
- CameraPowerDown(phyCameraIds);
- return DEVICE_ERROR;
- }
-
- auto sptrDevice = deviceBackup_.find(cameraId);
- if (sptrDevice == deviceBackup_.end()) {
- deviceBackup_[cameraId] = cameraDevice.get();
- }
- device = deviceBackup_[cameraId];
- cameraDevice->SetStatus(true);
- return NO_ERROR;
- }
- ```
-
-5. GetStreamOperator()接口
-
- CameraDeviceImpl定义了GetStreamOperator、UpdateSettings、SetResultMode和GetEnabledResult等方法，获取流操作方法如下：
-
- ```
- CamRetCode CameraDeviceImpl::GetStreamOperator(const OHOS::sptr &callback,
- OHOS::sptr &streamOperator)
- {
- if (callback == nullptr) {
- CAMERA_LOGW("input callback is null.");
- return INVALID_ARGUMENT;
- }
- spCameraDeciceCallback_ = callback;
- if (spStreamOperator_ == nullptr) {
- // 这里new了一个spStreamOperator对象传递给调用者，以便对stream进行各种操作。
- spStreamOperator_ = new(std::nothrow) StreamOperatorImpl(spCameraDeciceCallback_, shared_from_this());
- if (spStreamOperator_ == nullptr) {
- CAMERA_LOGW("create stream operator failed.");
- return DEVICE_ERROR;
- }
- ismOperator_ = spStreamOperator_;
- }
- streamOperator = ismOperator_;
-
- spStreamOperator_->SetRequestCallback([this](){
- cameraDeciceCallback_->OnError(REQUEST_TIMEOUT, 0);
- });
- }
- ```
-
-6. 创建流
-
- 调用CreateStreams创建流前需要填充StreamInfo结构体，具体内容如下：
+
- ```
- using StreamInfo = struct _StreamInfo {
- int streamId_;
- int width_; // 数据流宽
- int height_; // 数据流高
- int format_; // 数据流格式，如PIXEL_FMT_YCRCB_420_SP
- int datasapce_;
- StreamIntent intent_; // StreamIntent 如PREVIEW
- bool tunneledMode_;
- OHOS::sptr bufferQueue_; // 数据流bufferQueue可用streamCustomer->CreateProducer()接口创建
- int minFrameDuration_;
- EncodeType encodeType_;
- };
- ```
+## 开发指导
- CreateStreams()接口是StreamOperatorImpl类中的方法，该接口的主要作用是创建一个StreamBase对象，通过StreamBase的Init方法初始化CreateBufferPool等操作。
- ```
- RetCode StreamOperatorImpl::CreateStream(const std::shared_ptr& streamInfo)
- {
- static std::map typeMap = {
- {PREVIEW, "PREVIEW"},
- {VIDEO, "VIDEO"},
- {STILL_CAPTURE, "STILL_CAPTURE"},
- {POST_VIEW, "POST_VIEW"}, {ANALYZE, "ANALYZE"},
- {CUSTOM, "CUSTOM"}
- };
-
- auto itr = typeMap.find(streamInfo->intent_);
- if (itr == typeMap.end()) {
- CAMERA_LOGE("do not support stream type. [type = %{public}d]", streamInfo->intent_);
- return RC_ERROR;
- }
- std::shared_ptr stream = StreamFactory::Instance().CreateShared(itr->second); // 创建StreamBase实例
- RetCode rc = stream->Init(streamInfo);
- return RC_OK;
- }
- ```
+### 场景介绍
-7. 配置流
+Camera模块主要用以相机预览、拍照、视频流等场景下对相机操作封装，使开发者更易操作相机硬件，提高开发效率。
- CommitStreams()是配置流的接口，必须在创建流之后调用，其主要作用是初始化Pipeline和创建Pipeline。
+### 接口说明
- ```
- CamRetCode StreamOperatorImpl::CommitStreams(OperationMode mode, const std::shared_ptr& modeSetting)
- {
- auto cameraDevice = cameraDevice_.lock();
- if (cameraDevice == nullptr) {
- CAMERA_LOGE("camera device closed.");
- return CAMERA_CLOSED;
- }
- std::shared_ptr PipelineCore =
- std::static_pointer_cast(cameraDevice)->GetPipelineCore();
- if (PipelineCore == nullptr) {
- CAMERA_LOGE("get pipeline core failed.");
- return CAMERA_CLOSED;
- }
-
- streamPipeCore_ = PipelineCore->GetStreamPipelineCore();
- if (streamPipeCore_ == nullptr) {
- CAMERA_LOGE("get stream pipeline core failed.");
- return DEVICE_ERROR;
- }
-
- RetCode rc = streamPipeCore_->Init(); // 对pipelinecore的初始化
- if (rc != RC_OK) {
- CAMERA_LOGE("stream pipeline core init failed.");
- return DEVICE_ERROR;
- }
- rc = streamPipeCore_->CreatePipeline(mode); // 创建一个pipeline
- if (rc != RC_OK) {
- CAMERA_LOGE("create pipeline failed.");
- return INVALID_ARGUMENT;
- }
- return NO_ERROR;
- }
- ```
+- icamera_device.h
-8. 捕获图像
+ | 功能描述 | 接口名称 |
+ | ---------------------------- | ------------------------------------------------------------ |
+ | 获取流控制器 | CamRetCode GetStreamOperator(
const OHOS::sptr &callback,
OHOS::sptr &streamOperator) |
+ | 更新设备控制参数 | CamRetCode UpdateSettings(const std::shared_ptr &settingss) |
+ | 设置Result回调模式和回调函数 | CamRetCode SetResultMode(const ResultCallbackMode &mode) |
+ | 获取使能的ResultMeta | CamRetCode GetEnabledResults(std::vector &results) |
+ | 使能具体的ResultMeta | CamRetCode EnableResult(const std::vector &results) |
+ | 禁止具体的ResultMeta | CamRetCode DisableResult(const std::vector &results) |
+ | 关闭Camera设备 | void Close() |
- 在调用Capture()接口前需要先填充CaptureInfo结构体，具体内容如下：
+- icamera_device_callback.h
- ```
- using CaptureInfo = struct _CaptureInfo {
- std::vector streamIds_; //需要Capture的streamIds
- std::shared_ptr captureSetting_; // 这里填充camera ability 可通过CameraHost 的GetCameraAbility()接口获取
- bool enableShutterCallback_;
- };
- ```
+ | 功能描述 | 接口名称 |
+ | ---------------------------------------------------------- | ------------------------------------------------------------ |
+ | 设备发生错误时调用，由调用者实现，用于返回错误信息给调用者 | void OnError(ErrorType type, int32_t errorCode) |
+ | 上报camera设备相关的metadata的回调 | void OnResult(uint64_t timestamp, const std::shared_ptr &result) |
- StreamOperatorImpl中的Capture方法主要调用CreateCapture()接口去捕获数据流：
- ```
- CamRetCode StreamOperatorImpl::Capture(int captureId, const std::shared_ptr& captureInfo, bool isStreaming)
- {
- if (!ValidCaptureInfo(captureId, captureInfo)) {
- CAMERA_LOGE("capture streamIds is empty. [captureId = %d]", captureId);
- return INVALID_ARGUMENT;
- }
- std::shared_ptr cameraCapture = nullptr;
- RetCode rc = CreateCapture(captureId, captureInfo, isStreaming, cameraCapture);
- if (rc != RC_OK) {
- CAMERA_LOGE("create capture is failed.");
- return DEVICE_ERROR;
- }
-
- {
- std::unique_lock lock(captureMutex_);
- camerCaptureMap_.insert(std::make_pair(captureId, cameraCapture));
- }
-
- rc = StartThread();
- if (rc != RC_OK) {
- CAMERA_LOGE("preview start failed.");
- return DEVICE_ERROR;
- }
- return NO_ERROR;
- }
- ```
+- icamera_host.h
-9. 取消捕获和释放离线流
+ | 功能描述 | 接口名称 |
+ | ------------------------------ | ------------------------------------------------------------ |
+ | 设置ICameraHost回调接口 | CamRetCode SetCallback(const OHOS::sptr &callback) |
+ | 获取当前可用的Camera设备ID列表 | CamRetCode GetCameraIds(std::vector &cameraIds) |
+ | 获取Camera设备能力集合 | CamRetCode GetCameraAbility(const std::string &cameraId,
std::shared_ptr &ability) |
+ | 打开Camera设备 | CamRetCode OpenCamera(const std::string &cameraId,
const OHOS::sptr &callback,
OHOS::sptr &device) |
+ | 打开或关闭闪光灯 | CamRetCode SetFlashlight(const std::string &cameraId, bool &isEnable) |
- StreamOperatorImpl类中的CancelCapture()接口的主要作用是根据captureId取消数据流的捕获。
+- icamera_host_callback.h
- ```
- CamRetCode StreamOperatorImpl::CancelCapture(int captureId)
- {
- auto itr = camerCaptureMap_.find(captureId); //根据captureId 在Map中查找对应的CameraCapture对象
- RetCode rc = itr->second->Cancel(); //调用CameraCapture中Cancel方法结束数据捕获
- std::unique_lock lock(captureMutex_);
- camerCaptureMap_.erase(itr); //擦除该CameraCapture对象
- return NO_ERROR;
- }
- ```
+ | 功能描述 | 接口名称 |
+ | ---------------------- | ------------------------------------------------------------ |
+ | Camera设备状态变化上报 | void OnCameraStatus(const std::string &cameraId, CameraStatus status) |
+ | 闪光灯状态变化回调 | void OnFlashlightStatus(const std::string &cameraId, FlashlightStatus status) |
- StreamOperatorImpl类中的ReleaseStreams接口的主要作用是释放之前通过CreateStream()和CommitStreams()接口创建的流，并销毁Pipeline。
+- ioffline_stream_operator.h
- ```
- CamRetCode StreamOperatorImpl::ReleaseStreams(const std::vector& streamIds)
- {
- RetCode rc = DestroyStreamPipeline(streamIds); //销毁该streamIds 的pipeline
- rc = DestroyHostStreamMgr(streamIds);
- rc = DestroyStreams(streamIds); //销毁该streamIds 的 Stream
- return NO_ERROR;
- }
- ```
+ | 功能描述 | 接口名称 |
+ | -------------- | ------------------------------------------------------------ |
+ | 取消捕获请求 | CamRetCode CancelCapture(int captureId) |
+ | 释放流 | CamRetCode ReleaseStreams(const std::vector &streamIds) |
+ | 释放所有离线流 | CamRetCode Release() |
-10. 关闭Camera设备
+- istream_operator.h
- 调用CameraDeviceImpl中的Close()来关闭CameraDevice，该接口调用deviceManager中的PowerDown()来给设备下电。
+ | 功能描述 | 接口名称 |
+ | -------------------------------- | ------------------------------------------------------------ |
+ | 查询是否支持添加参数对应的流 | CamRetCode IsStreamsSupported(
OperationMode mode,
const std::shared_ptr &modeSetting,
const std::vector<std::shared_ptr<StreamInfo>> &info,
StreamSupportType &type) |
+ | 创建流 | CamRetCode CreateStreams(const std::vector> &streamInfos) |
+ | 释放流 | CamRetCode ReleaseStreams(const std::vector &streamIds) |
+ | 配置流 | CamRetCode CommitStreams(OperationMode mode,
const std::shared_ptr &modeSetting) |
+ | 获取流的属性 | CamRetCode GetStreamAttributes(
std::vector> &attributes) |
+ | 绑定生产者句柄和指定流 | CamRetCode AttachBufferQueue(int streamId, const OHOS::sptr &producer) |
+ | 解除生产者句柄和指定流的绑定关系 | CamRetCode DetachBufferQueue(int streamId) |
+ | 捕获图像 | CamRetCode Capture(int captureId,
const std::shared_ptr &info, bool isStreaming) |
+ | 取消捕获 | CamRetCode CancelCapture(int captureId) |
+ | 将指定流转换成离线流 | CamRetCode ChangeToOfflineStream(const std::vector &streamIds,
OHOS::sptr &callback,
OHOS::sptr &offlineOperator) |
+- istream_operator_callback.h
-## 开发实例
+ | 功能描述 | 接口名称 |
+ | ---------------------------------------- | ------------------------------------------------------------ |
+ | 捕获开始回调，在捕获开始时调用 | void OnCaptureStarted(int32_t captureId, const std::vector &streamIds) |
+ | 捕获结束回调，在捕获结束时调用 | void OnCaptureEnded(int32_t captureId,
const std::vector> &infos) |
+ | 捕获错误回调，在捕获过程中发生错误时调用 | void OnCaptureError(int32_t captureId,
const std::vector> &infos) |
+ | 帧捕获回调 | void OnFrameShutter(int32_t captureId,
const std::vector &streamIds, uint64_t timestamp) |
-在/drivers/peripheral/camera/hal/init目录下有一个关于Camera的demo，开机后会在/system/bin下生成可执行文件ohos_camera_demo，该demo可以完成camera的预览，拍照等基础功能。下面我们就以此demo为例讲述怎样用HDI接口去编写预览PreviewOn()和拍照CaptureON()的用例。
+### 开发步骤
+Camera驱动的开发过程主要包含以下步骤：
-1. 在main函数中构造一个Hos3516Demo对象，该对象中有对camera初始化、启停流、释放等控制的方法。下面mainDemo->InitSensors()函数为初始化CameraHost，mainDemo->InitCameraDevice()函数为初始化CameraDevice。
+1. **注册CameraHost**
+ 定义Camera的HdfDriverEntry结构体，该结构体中定义了CameraHost初始化的方法。
```
- int main(int argc, char** argv)
- {
- RetCode rc = RC_OK;
- auto mainDemo = std::make_shared();
- rc = mainDemo->InitSensors(); // 初始化CameraHost
- if (rc == RC_ERROR) {
- CAMERA_LOGE("main test: mainDemo->InitSensors() error\n");
- return -1;
- }
-
- rc = mainDemo->InitCameraDevice(); // 初始化CameraDevice
- if (rc == RC_ERROR) {
- CAMERA_LOGE("main test: mainDemo->InitCameraDevice() error\n");
- return -1;
- }
-
- rc = PreviewOn(0, mainDemo); // 配流和启流
- if (rc != RC_OK) {
- CAMERA_LOGE("main test: PreviewOn() error demo exit");
- return -1;
- }
-
- ManuList(mainDemo, argc, argv); // 打印菜单到控制台
+ struct HdfDriverEntry g_cameraHostDriverEntry = {
+ .moduleVersion = 1,
+ .moduleName = "camera_service",
+ .Bind = HdfCameraHostDriverBind,
+ .Init = HdfCameraHostDriverInit,
+ .Release = HdfCameraHostDriverRelease,
+ };
+ HDF_INIT(g_cameraHostDriverEntry); // 将Camera的HdfDriverEntry结构体注册到HDF上
+ ```
+
+2. **初始化Host服务**
+
+ 步骤1中提到的HdfCameraHostDriverBind接口提供了CameraServiceDispatch和CameraHostStubInstance的注册。这两个接口一个是远端调用CameraHost的方法，如OpenCamera()，SetFlashlight()等，另外一个是Camera设备的初始化，在开机时被调用。
+
+ ```
+ int HdfCameraHostDriverBind(HdfDeviceObject *deviceObject)
+ {
+ HDF_LOGI("HdfCameraHostDriverBind enter!");
+ if (deviceObject == nullptr) {
+ HDF_LOGE("HdfCameraHostDriverBind: HdfDeviceObject is NULL !");
+ return HDF_FAILURE;
+ }
+ HdfCameraService *hdfCameraService = reinterpret_cast(OsalMemAlloc(sizeof(HdfCameraService)));
+ if (hdfCameraService == nullptr) {
+ HDF_LOGE("HdfCameraHostDriverBind OsalMemAlloc HdfCameraService failed!");
+ return HDF_FAILURE;
+ }
+ hdfCameraService->ioservice.Dispatch = CameraServiceDispatch; // 提供远端CameraHost调用方法
+ hdfCameraService->ioservice.Open = nullptr;
+ hdfCameraService->ioservice.Release = nullptr;
+ hdfCameraService->instance = CameraHostStubInstance(); // 初始化Camera设备
+ deviceObject->service = &hdfCameraService->ioservice;
+ return HDF_SUCCESS;
+ }
+ ```
+
+ 下面的函数是远端CameraHost调用的方法：
+
+ ```
+ int32_t CameraHostStub::CameraHostServiceStubOnRemoteRequest(int cmdId, MessageParcel &data,
+ MessageParcel &reply, MessageOption &option)
+ {
+ switch(cmdId) {
+ case CMD_CAMERA_HOST_SET_CALLBACK: {
+ return CameraHostStubSetCallback(data, reply, option);
+ }
+ case CMD_CAMERA_HOST_GET_CAMERAID: {
+ return CameraHostStubGetCameraIds(data, reply, option);
+ }
+ case CMD_CAMERA_HOST_GET_CAMERA_ABILITY: {
+ return CameraHostStubGetCameraAbility(data, reply, option);
+ }
+ case CMD_CAMERA_HOST_OPEN_CAMERA: {
+ return CameraHostStubOpenCamera(data, reply, option);
+ }
+ case CMD_CAMERA_HOST_SET_FLASH_LIGHT: {
+ return CameraHostStubSetFlashlight(data, reply, option);
+ }
+ default: {
+ HDF_LOGE("%s: not support cmd %d", __func__, cmdId);
+ return HDF_ERR_INVALID_PARAM;
+ }
+ }
+ return HDF_SUCCESS;
+ }
+ ```
+
+ CameraHostStubInstance()接口最终调用CameraHostImpl::Init()方法，该方法会获取物理Camera，并对DeviceManager和PipelineCore进行初始化。
+
+3. **获取Host服务**
+
+ 调用Get()接口从远端CameraService中获取CameraHost对象。get()方法如下：
+
+ ```
+ sptr ICameraHost::Get(const char *serviceName)
+ {
+ do {
+ using namespace OHOS::HDI::ServiceManager::V1_0;
+ auto servMgr = IServiceManager::Get();
+ if (servMgr == nullptr) {
+ HDF_LOGE("%s: IServiceManager failed!", __func__);
+ break;
+ }
+ auto remote = servMgr->GetService(serviceName); // 根据serviceName名称获取CameraHost
+ if (remote != nullptr) {
+ sptr hostSptr = iface_cast(remote); // 将CameraHostProxy对象返回给调用者，该对象中包含OpenCamera()等方法。
+ return hostSptr;
+ }
+ HDF_LOGE("%s: GetService failed! serviceName = %s", __func__, serviceName);
+ } while(false);
+ HDF_LOGE("%s: get %s failed!", __func__, serviceName);
+ return nullptr;
+ }
+ ```
+
+4. **打开设备**
+
+ CameraHostProxy对象中有五个方法，分别是SetCallback、GetCameraIds、GetCameraAbility、OpenCamera和SetFlashlight。下面着重描述OpenCamera接口。
+ CameraHostProxy的OpenCamera()接口通过CMD_CAMERA_HOST_OPEN_CAMERA调用远端CameraHostStubOpenCamera()接口并获取ICameraDevice对象。
+
+ ```
+ CamRetCode CameraHostProxy::OpenCamera(const std::string &cameraId, const OHOS::sptr &callback, OHOS::sptr &pDevice)
+ {
+ int32_t ret = Remote()->SendRequest(CMD_CAMERA_HOST_REMOTE_OPEN_CAMERA, data, reply, option);
+ if (ret != HDF_SUCCESS) {
+ HDF_LOGE("%{public}s: SendRequest failed, error code is %{public}d", __func__, ret);
+ return INVALID_ARGUMENT;
+ }
+ CamRetCode retCode = static_cast(reply.ReadInt32());
+ bool flag = reply.ReadBool();
+ if (flag) {
+ sptr remoteCameraDevice = reply.ReadRemoteObject();
+ if (remoteCameraDevice == nullptr) {
+ HDF_LOGE("%{public}s: CameraHostProxy remoteCameraDevice is null", __func__);
+ }
+ pDevice = OHOS::iface_cast(remoteCameraDevice);
+ }
+ return retCode;
+ }
+ ```
+
+ Remote()->SendRequest调用上文提到的CameraHostServiceStubOnRemoteRequest()，根据cmdId进入CameraHostStubOpenCamera()接口，最终调用CameraHostImpl::OpenCamera()，该接口获取了CameraDevice并对硬件进行上电等操作。
+
+ ```
+ CamRetCode CameraHostImpl::OpenCamera(const std::string &cameraId, const OHOS::sptr &callback, OHOS::sptr &device)
+ {
+ std::shared_ptr cameraDevice = std::static_pointer_cast(itr->second);
+ if (cameraDevice == nullptr) {
+ CAMERA_LOGE("camera device is null.");
+ return INSUFFICIENT_RESOURCES;
+ }
+ CamRetCode ret = cameraDevice->SetCallback(callback);
+ if (ret != NO_ERROR) {
+ CAMERA_LOGW("set camera device callback faild.");
+ return ret;
+ }
+ CameraHostConfig *config = CameraHostConfig::GetInstance();
+ if (config == nullptr) {
+ return INVALID_ARGUMENT;
+ }
+ std::vector phyCameraIds;
+ RetCode rc = config->GetPhysicCameraIds(cameraId, phyCameraIds);
+ if (rc != RC_OK) {
+ CAMERA_LOGE("get physic cameraId failed.");
+ return DEVICE_ERROR;
+ }
+ if (CameraPowerUp(cameraId, phyCameraIds) != RC_OK) { // 对Camera硬件上电
+ CAMERA_LOGE("camera powerup failed.");
+ CameraPowerDown(phyCameraIds);
+ return DEVICE_ERROR;
+ }
+
+ auto sptrDevice = deviceBackup_.find(cameraId);
+ if (sptrDevice == deviceBackup_.end()) {
+ deviceBackup_[cameraId] = cameraDevice.get();
+ }
+ device = deviceBackup_[cameraId];
+ cameraDevice->SetStatus(true);
+ return NO_ERROR;
+ }
+ ```
+
+5. **获取流**
+
+ CameraDeviceImpl定义了GetStreamOperator、UpdateSettings、SetResultMode和GetEnabledResult等方法，获取流操作方法如下：
+
+ ```
+ CamRetCode CameraDeviceImpl::GetStreamOperator(const OHOS::sptr &callback,
+ OHOS::sptr &streamOperator)
+ {
+ if (callback == nullptr) {
+ CAMERA_LOGW("input callback is null.");
+ return INVALID_ARGUMENT;
+ }
+ spCameraDeciceCallback_ = callback;
+ if (spStreamOperator_ == nullptr) {
+ // 这里new了一个spStreamOperator对象传递给调用者，以便对stream进行各种操作。
+ spStreamOperator_ = new(std::nothrow) StreamOperatorImpl(spCameraDeciceCallback_, shared_from_this());
+ if (spStreamOperator_ == nullptr) {
+ CAMERA_LOGW("create stream operator failed.");
+ return DEVICE_ERROR;
+ }
+ ismOperator_ = spStreamOperator_;
+ }
+ streamOperator = ismOperator_;
+
+ spStreamOperator_->SetRequestCallback([this](){
+ cameraDeciceCallback_->OnError(REQUEST_TIMEOUT, 0);
+ });
+ }
+ ```
+
+6. **创建流**
+
+ 调用CreateStreams创建流前需要填充StreamInfo结构体，具体内容如下：
+
+ ```
+ using StreamInfo = struct _StreamInfo {
+ int streamId_;
+ int width_; // 数据流宽
+ int height_; // 数据流高
+ int format_; // 数据流格式，如PIXEL_FMT_YCRCB_420_SP
+ int datasapce_;
+ StreamIntent intent_; // StreamIntent 如PREVIEW
+ bool tunneledMode_;
+ OHOS::sptr bufferQueue_; // 数据流bufferQueue可用streamCustomer->CreateProducer()接口创建
+ int minFrameDuration_;
+ EncodeType encodeType_;
+ };
+ ```
+
+ CreateStreams()接口是StreamOperatorImpl类中的方法，该接口的主要作用是创建一个StreamBase对象，通过StreamBase的Init方法初始化CreateBufferPool等操作。
+
+ ```
+ RetCode StreamOperatorImpl::CreateStream(const std::shared_ptr& streamInfo)
+ {
+ static std::map typeMap = {
+ {PREVIEW, "PREVIEW"},
+ {VIDEO, "VIDEO"},
+ {STILL_CAPTURE, "STILL_CAPTURE"},
+ {POST_VIEW, "POST_VIEW"}, {ANALYZE, "ANALYZE"},
+ {CUSTOM, "CUSTOM"}
+ };
+
+ auto itr = typeMap.find(streamInfo->intent_);
+ if (itr == typeMap.end()) {
+ CAMERA_LOGE("do not support stream type. [type = %{public}d]", streamInfo->intent_);
+ return RC_ERROR;
+ }
+ std::shared_ptr stream = StreamFactory::Instance().CreateShared(itr->second); // 创建StreamBase实例
+ RetCode rc = stream->Init(streamInfo);
+ return RC_OK;
+ }
+ ```
+
+7. **配置流**
+
+ CommitStreams()是配置流的接口，必须在创建流之后调用，其主要作用是初始化Pipeline和创建Pipeline。
+
+ ```
+ CamRetCode StreamOperatorImpl::CommitStreams(OperationMode mode, const std::shared_ptr& modeSetting)
+ {
+ auto cameraDevice = cameraDevice_.lock();
+ if (cameraDevice == nullptr) {
+ CAMERA_LOGE("camera device closed.");
+ return CAMERA_CLOSED;
+ }
+ std::shared_ptr PipelineCore =
+ std::static_pointer_cast(cameraDevice)->GetPipelineCore();
+ if (PipelineCore == nullptr) {
+ CAMERA_LOGE("get pipeline core failed.");
+ return CAMERA_CLOSED;
+ }
+
+ streamPipeCore_ = PipelineCore->GetStreamPipelineCore();
+ if (streamPipeCore_ == nullptr) {
+ CAMERA_LOGE("get stream pipeline core failed.");
+ return DEVICE_ERROR;
+ }
+
+ RetCode rc = streamPipeCore_->Init(); // 对pipelinecore的初始化
+ if (rc != RC_OK) {
+ CAMERA_LOGE("stream pipeline core init failed.");
+ return DEVICE_ERROR;
+ }
+ rc = streamPipeCore_->CreatePipeline(mode); // 创建一个pipeline
+ if (rc != RC_OK) {
+ CAMERA_LOGE("create pipeline failed.");
+ return INVALID_ARGUMENT;
+ }
+ return NO_ERROR;
+ }
+ ```
+
+8. **捕获图像**
+
+ 在调用Capture()接口前需要先填充CaptureInfo结构体，具体内容如下：
+
+ ```
+ using CaptureInfo = struct _CaptureInfo {
+ std::vector streamIds_; //需要Capture的streamIds
+ std::shared_ptr captureSetting_; // 这里填充camera ability 可通过CameraHost 的GetCameraAbility()接口获取
+ bool enableShutterCallback_;
+ };
+ ```
+
+ StreamOperatorImpl中的Capture方法主要调用CreateCapture()接口去捕获数据流：
+
+ ```
+ CamRetCode StreamOperatorImpl::Capture(int captureId, const std::shared_ptr& captureInfo, bool isStreaming)
+ {
+ if (!ValidCaptureInfo(captureId, captureInfo)) {
+ CAMERA_LOGE("capture streamIds is empty. [captureId = %d]", captureId);
+ return INVALID_ARGUMENT;
+ }
+ std::shared_ptr cameraCapture = nullptr;
+ RetCode rc = CreateCapture(captureId, captureInfo, isStreaming, cameraCapture);
+ if (rc != RC_OK) {
+ CAMERA_LOGE("create capture is failed.");
+ return DEVICE_ERROR;
+ }
+
+ {
+ std::unique_lock lock(captureMutex_);
+ camerCaptureMap_.insert(std::make_pair(captureId, cameraCapture));
+ }
+
+ rc = StartThread();
+ if (rc != RC_OK) {
+ CAMERA_LOGE("preview start failed.");
+ return DEVICE_ERROR;
+ }
+ return NO_ERROR;
+ }
+ ```
+
+9. **取消捕获和释放离线流**
+
+ StreamOperatorImpl类中的CancelCapture()接口的主要作用是根据captureId取消数据流的捕获。
+
+ ```
+ CamRetCode StreamOperatorImpl::CancelCapture(int captureId)
+ {
+ auto itr = camerCaptureMap_.find(captureId); //根据captureId 在Map中查找对应的CameraCapture对象
+ RetCode rc = itr->second->Cancel(); //调用CameraCapture中Cancel方法结束数据捕获
+ std::unique_lock lock(captureMutex_);
+ camerCaptureMap_.erase(itr); //擦除该CameraCapture对象
+ return NO_ERROR;
+ }
+ ```
+
+ StreamOperatorImpl类中的ReleaseStreams接口的主要作用是释放之前通过CreateStream()和CommitStreams()接口创建的流，并销毁Pipeline。
+
+ ```
+ CamRetCode StreamOperatorImpl::ReleaseStreams(const std::vector& streamIds)
+ {
+ RetCode rc = DestroyStreamPipeline(streamIds); //销毁该streamIds 的pipeline
+ rc = DestroyHostStreamMgr(streamIds);
+ rc = DestroyStreams(streamIds); //销毁该streamIds 的 Stream
+ return NO_ERROR;
+ }
+ ```
+
+10. **关闭Camera设备**
- return RC_OK;
- }
- ```
+ 调用CameraDeviceImpl中的Close()来关闭CameraDevice，该接口调用deviceManager中的PowerDown()来给设备下电。
- 初始化CameraHost函数实现如下，这里调用了HDI接口ICameraHost::Get()去获取demoCameraHost，并对其设置回调函数。
+### 开发实例
- ```
- RetCode Hos3516Demo::InitSensors()
- {
- demoCameraHost_ = ICameraHost::Get(DEMO_SERVICE_NAME);
- if (demoCameraHost_ == nullptr) {
- CAMERA_LOGE("demo test: ICameraHost::Get error");
- return RC_ERROR;
- }
-
- hostCallback_ = new CameraHostCallback();
- rc = demoCameraHost_->SetCallback(hostCallback_);
- return RC_OK;
- }
- ```
+在/drivers/peripheral/camera/hal/init目录下有一个关于Camera的demo，开机后会在/system/bin下生成可执行文件ohos_camera_demo，该demo可以完成Ｃamera的预览，拍照等基础功能。下面我们就以此demo为例讲述怎样用HDI接口去编写预览PreviewOn()和拍照CaptureON()的用例，可参考[ohos_camera_demo](https://gitee.com/openharmony/drivers_peripheral/tree/master/camera/hal/init)。
- 初始化CameraDevice函数实现如下，这里调用了GetCameraIds(cameraIds_)，GetCameraAbility(cameraId, ability_)，OpenCamera(cameraIds_.front(), callback, demoCameraDevice_)等接口实现了demoCameraHost的获取。
+1. 在main函数中构造一个Hos3516Demo对象，该对象中有对Ｃamera初始化、启停流、释放等控制的方法。下面mainDemo->InitSensors()函数为初始化CameraHost，mainDemo->InitCameraDevice()函数为初始化CameraDevice。
- ```
- RetCode Hos3516Demo::InitCameraDevice()
- {
- (void)demoCameraHost_->GetCameraIds(cameraIds_);
- const std::string cameraId = cameraIds_.front();
- demoCameraHost_->GetCameraAbility(cameraId, ability_);
-
- sptr callback = new CameraDeviceCallback();
- rc = demoCameraHost_->OpenCamera(cameraIds_.front(), callback, demoCameraDevice_);
- return RC_OK;
- }
- ```
+ ```
+ int main(int argc, char** argv)
+ {
+ RetCode rc = RC_OK;
+ auto mainDemo = std::make_shared();
+ rc = mainDemo->InitSensors(); // 初始化CameraHost
+ if (rc == RC_ERROR) {
+ CAMERA_LOGE("main test: mainDemo->InitSensors() error\n");
+ return -1;
+ }
+
+ rc = mainDemo->InitCameraDevice(); // 初始化CameraDevice
+ if (rc == RC_ERROR) {
+ CAMERA_LOGE("main test: mainDemo->InitCameraDevice() error\n");
+ return -1;
+ }
+
+ rc = PreviewOn(0, mainDemo); // 配流和启流
+ if (rc != RC_OK) {
+ CAMERA_LOGE("main test: PreviewOn() error demo exit");
+ return -1;
+ }
+
+ ManuList(mainDemo, argc, argv); // 打印菜单到控制台
+
+ return RC_OK;
+ }
+ ```
+
+ 初始化CameraHost函数实现如下，这里调用了HDI接口ICameraHost::Get()去获取demoCameraHost，并对其设置回调函数。
+
+ ```
+ RetCode Hos3516Demo::InitSensors()
+ {
+ demoCameraHost_ = ICameraHost::Get(DEMO_SERVICE_NAME);
+ if (demoCameraHost_ == nullptr) {
+ CAMERA_LOGE("demo test: ICameraHost::Get error");
+ return RC_ERROR;
+ }
+
+ hostCallback_ = new CameraHostCallback();
+ rc = demoCameraHost_->SetCallback(hostCallback_);
+ return RC_OK;
+ }
+ ```
+
+ 初始化CameraDevice函数实现如下，这里调用了GetCameraIds(cameraIds_)，GetCameraAbility(cameraId, ability_)，OpenCamera(cameraIds_.front(), callback, demoCameraDevice_)等接口实现了demoCameraHost的获取。
+
+ ```
+ RetCode Hos3516Demo::InitCameraDevice()
+ {
+ (void)demoCameraHost_->GetCameraIds(cameraIds_);
+ const std::string cameraId = cameraIds_.front();
+ demoCameraHost_->GetCameraAbility(cameraId, ability_);
+
+ sptr callback = new CameraDeviceCallback();
+ rc = demoCameraHost_->OpenCamera(cameraIds_.front(), callback, demoCameraDevice_);
+ return RC_OK;
+ }
+ ```
2. PreviewOn()接口包含配置流、开启预览流和启动Capture动作。该接口执行完成后Camera预览通路已经开始运转并开启了两路流，一路流是preview，另外一路流是capture或者video，两路流中仅对preview流进行capture动作。
- ```
- static RetCode PreviewOn(int mode, const std::shared_ptr& mainDemo)
- {
- rc = mainDemo->StartPreviewStream(); // 配置preview流
- if (mode == 0) {
- rc = mainDemo->StartCaptureStream(); // 配置capture流
- } else {
- rc = mainDemo->StartVideoStream(); // 配置video流
- }
-
- rc = mainDemo->CaptureON(STREAM_ID_PREVIEW, CAPTURE_ID_PREVIEW, CAPTURE_PREVIEW); // 将preview流capture
- return RC_OK;
- }
- ```
-
- StartCaptureStream()、StartVideoStream()和StartPreviewStream()接口都会调用CreateStream()接口，只是传入的参数不同。
-
- ```
- RetCode Hos3516Demo::StartVideoStream()
- {
- RetCode rc = RC_OK;
- if (isVideoOn_ == 0) {
- isVideoOn_ = 1;
- rc = CreateStream(STREAM_ID_VIDEO, streamCustomerVideo_, VIDEO); // 如需启preview或者capture流更改该接口参数即可。
- }
- return RC_OK;
- }
- ```
-
- CreateStream()方法调用HDI接口去配置和创建流，首先调用HDI接口去获取StreamOperation对象，然后创建一个StreamInfo。调用CreateStreams()和CommitStreams()实际创建流并配置流。
-
- ```
- RetCode Hos3516Demo::CreateStreams(const int streamIdSecond, StreamIntent intent)
- {
- std::vector> streamInfos;
- std::vector>().swap(streamInfos);
- GetStreamOpt(); // 获取StreamOperator对象
- std::shared_ptr previewStreamInfo = std::make_shared();
- SetStreamInfo(previewStreamInfo, streamCustomerPreview_, STREAM_ID_PREVIEW, PREVIEW); // 填充StreamInfo
- if (previewStreamInfo->bufferQueue_ == nullptr) {
- CAMERA_LOGE("demo test: CreateStream CreateProducer(); is nullptr\n");
- return RC_ERROR;
- }
- streamInfos.push_back(previewStreamInfo);
-
- std::shared_ptr secondStreamInfo = std::make_shared();
- if (streamIdSecond == STREAM_ID_CAPTURE) {
- SetStreamInfo(secondStreamInfo, streamCustomerCapture_, STREAM_ID_CAPTURE, intent);
- } else {
- SetStreamInfo(secondStreamInfo, streamCustomerVideo_, STREAM_ID_VIDEO, intent);
- }
-
- if (secondStreamInfo->bufferQueue_ == nullptr) {
- CAMERA_LOGE("demo test: CreateStreams CreateProducer() secondStreamInfo is nullptr\n");
- return RC_ERROR;
- }
- streamInfos.push_back(secondStreamInfo);
-
- rc = streamOperator_->CreateStreams(streamInfos); // 创建流
- if (rc != Camera::NO_ERROR) {
- CAMERA_LOGE("demo test: CreateStream CreateStreams error\n");
- return RC_ERROR;
- }
-
- rc = streamOperator_->CommitStreams(Camera::NORMAL, ability_);
- if (rc != Camera::NO_ERROR) {
- CAMERA_LOGE("demo test: CreateStream CommitStreams error\n");
- std::vector streamIds = {STREAM_ID_PREVIEW, streamIdSecond};
- streamOperator_->ReleaseStreams(streamIds);
- return RC_ERROR;
- }
- return RC_OK;
- }
- ```
-
- CaptureON()接口调用streamOperator的Capture()方法获取camera数据并轮转buffer，拉起一个线程接收相应类型的数据。
-
- ```
- RetCode Hos3516Demo::CaptureON(const int streamId, const int captureId, CaptureMode mode)
- {
- std::shared_ptr captureInfo = std::make_shared(); // 创建并填充CaptureInfo
- captureInfo->streamIds_ = {streamId};
- captureInfo->captureSetting_ = ability_;
- captureInfo->enableShutterCallback_ = false;
-
- int rc = streamOperator_->Capture(captureId, captureInfo, true); // 实际capture开始，buffer轮转开始
- if (mode == CAPTURE_PREVIEW) {
- streamCustomerPreview_->ReceiveFrameOn(nullptr); // 创建预览线程接收递上来的buffer
- } else if (mode == CAPTURE_SNAPSHOT) {
- streamCustomerCapture_->ReceiveFrameOn([this](void* addr, const uint32_t size) { // 创建capture线程通过StoreImage回调接收递上来的buffer
- StoreImage(addr, size);
- });
- } else if (mode == CAPTURE_VIDEO) {
- OpenVideoFile();
- streamCustomerVideo_->ReceiveFrameOn([this](void* addr, const uint32_t size) {// 创建Video线程通过StoreVideo回调接收递上来的buffer
- StoreVideo(addr, size);
- });
- }
- return RC_OK;
- }
- ```
+ ```
+ static RetCode PreviewOn(int mode, const std::shared_ptr& mainDemo)
+ {
+ rc = mainDemo->StartPreviewStream(); // 配置preview流
+ if (mode == 0) {
+ rc = mainDemo->StartCaptureStream(); // 配置capture流
+ } else {
+ rc = mainDemo->StartVideoStream(); // 配置video流
+ }
+
+ rc = mainDemo->CaptureON(STREAM_ID_PREVIEW, CAPTURE_ID_PREVIEW, CAPTURE_PREVIEW); // 将preview流capture
+ return RC_OK;
+ }
+ ```
+
+ StartCaptureStream()、StartVideoStream()和StartPreviewStream()接口都会调用CreateStream()接口，只是传入的参数不同。
+
+ ```
+ RetCode Hos3516Demo::StartVideoStream()
+ {
+ RetCode rc = RC_OK;
+ if (isVideoOn_ == 0) {
+ isVideoOn_ = 1;
+ rc = CreateStream(STREAM_ID_VIDEO, streamCustomerVideo_, VIDEO); // 如需启preview或者capture流更改该接口参数即可。
+ }
+ return RC_OK;
+ }
+ ```
+
+ CreateStream()方法调用HDI接口去配置和创建流，首先调用HDI接口去获取StreamOperation对象，然后创建一个StreamInfo。调用CreateStreams()和CommitStreams()实际创建流并配置流。
+
+ ```
+ RetCode Hos3516Demo::CreateStreams(const int streamIdSecond, StreamIntent intent)
+ {
+ std::vector> streamInfos;
+ std::vector>().swap(streamInfos);
+ GetStreamOpt(); // 获取StreamOperator对象
+ std::shared_ptr previewStreamInfo = std::make_shared();
+ SetStreamInfo(previewStreamInfo, streamCustomerPreview_, STREAM_ID_PREVIEW, PREVIEW); // 填充StreamInfo
+ if (previewStreamInfo->bufferQueue_ == nullptr) {
+ CAMERA_LOGE("demo test: CreateStream CreateProducer(); is nullptr\n");
+ return RC_ERROR;
+ }
+ streamInfos.push_back(previewStreamInfo);
+
+ std::shared_ptr secondStreamInfo = std::make_shared();
+ if (streamIdSecond == STREAM_ID_CAPTURE) {
+ SetStreamInfo(secondStreamInfo, streamCustomerCapture_, STREAM_ID_CAPTURE, intent);
+ } else {
+ SetStreamInfo(secondStreamInfo, streamCustomerVideo_, STREAM_ID_VIDEO, intent);
+ }
+
+ if (secondStreamInfo->bufferQueue_ == nullptr) {
+ CAMERA_LOGE("demo test: CreateStreams CreateProducer() secondStreamInfo is nullptr\n");
+ return RC_ERROR;
+ }
+ streamInfos.push_back(secondStreamInfo);
+
+ rc = streamOperator_->CreateStreams(streamInfos); // 创建流
+ if (rc != Camera::NO_ERROR) {
+ CAMERA_LOGE("demo test: CreateStream CreateStreams error\n");
+ return RC_ERROR;
+ }
+
+ rc = streamOperator_->CommitStreams(Camera::NORMAL, ability_);
+ if (rc != Camera::NO_ERROR) {
+ CAMERA_LOGE("demo test: CreateStream CommitStreams error\n");
+ std::vector streamIds = {STREAM_ID_PREVIEW, streamIdSecond};
+ streamOperator_->ReleaseStreams(streamIds);
+ return RC_ERROR;
+ }
+ return RC_OK;
+ }
+ ```
+
+ CaptureON()接口调用streamOperator的Capture()方法获取Ｃamera数据并轮转buffer，拉起一个线程接收相应类型的数据。
+
+ ```
+ RetCode Hos3516Demo::CaptureON(const int streamId, const int captureId, CaptureMode mode)
+ {
+ std::shared_ptr captureInfo = std::make_shared(); // 创建并填充CaptureInfo
+ captureInfo->streamIds_ = {streamId};
+ captureInfo->captureSetting_ = ability_;
+ captureInfo->enableShutterCallback_ = false;
+
+ int rc = streamOperator_->Capture(captureId, captureInfo, true); // 实际capture开始，buffer轮转开始
+ if (mode == CAPTURE_PREVIEW) {
+ streamCustomerPreview_->ReceiveFrameOn(nullptr); // 创建预览线程接收递上来的buffer
+ } else if (mode == CAPTURE_SNAPSHOT) {
+ streamCustomerCapture_->ReceiveFrameOn([this](void* addr, const uint32_t size) { // 创建capture线程通过StoreImage回调接收递上来的buffer
+ StoreImage(addr, size);
+ });
+ } else if (mode == CAPTURE_VIDEO) {
+ OpenVideoFile();
+ streamCustomerVideo_->ReceiveFrameOn([this](void* addr, const uint32_t size) {// 创建Video线程通过StoreVideo回调接收递上来的buffer
+ StoreVideo(addr, size);
+ });
+ }
+ return RC_OK;
+ }
+ ```
3. ManuList()函数从控制台通过fgets()接口获取字符，不同字符所对应demo支持的功能不同，并打印出该demo所支持功能的菜单。
- ```
- static void ManuList(const std::shared_ptr& mainDemo,
- const int argc, char** argv)
- {
- int idx, c;
- int awb = 1;
- constexpr char shortOptions[] = "h:cwvaqof:";
- c = getopt_long(argc, argv, shortOptions, longOptions, &idx);
- while(1) {
- switch (c) {
- case 'h':
- c = PutMenuAndGetChr(); // 打印菜单
- break;
-
- case 'f':
- FlashLightTest(mainDemo); // 手电筒功能测试
- c = PutMenuAndGetChr();
- break;
- case 'o':
- OfflineTest(mainDemo); // Offline功能测试
- c = PutMenuAndGetChr();
- break;
- case 'c':
- CaptureTest(mainDemo); // Capture功能测试
- c = PutMenuAndGetChr();
- break;
- case 'w': // AWB功能测试
- if (awb) {
- mainDemo->SetAwbMode(OHOS_CAMERA_AWB_MODE_INCANDESCENT);
- } else {
- mainDemo->SetAwbMode(OHOS_CAMERA_AWB_MODE_OFF);
- }
- awb = !awb;
- c = PutMenuAndGetChr();
- break;
- case 'a': // AE功能测试
- mainDemo->SetAeExpo();
- c = PutMenuAndGetChr();
- break;
- case 'v': // Video功能测试
- VideoTest(mainDemo);
- c = PutMenuAndGetChr();
- break;
- case 'q': // 退出demo
- PreviewOff(mainDemo);
- mainDemo->QuitDemo();
- exit(EXIT_SUCCESS);
-
- default:
- CAMERA_LOGE("main test: command error please retry input command");
- c = PutMenuAndGetChr();
- break;
- }
- }
- }
- ```
-
- PutMenuAndGetChr()接口打印了demo程序的菜单，并调用fgets()等待从控制台输入命令，内容如下：
-
- ```
- static int PutMenuAndGetChr(void)
- {
- constexpr uint32_t inputCount = 50;
- int c = 0;
- char strs[inputCount];
- Usage(stdout);
- CAMERA_LOGD("pls input command(input -q exit this app)\n");
- fgets(strs, inputCount, stdin);
-
- for (int i = 0; i < inputCount; i++) {
- if (strs[i] != '-') {
- c = strs[i];
- break;
- }
- }
- return c;
- }
- ```
-
- 控制台输出菜单详情如下：
-
- ```
- "Options:\n"
- "-h | --help Print this message\n"
- "-o | --offline stream offline test\n"
- "-c | --capture capture one picture\n"
- "-w | --set WB Set white balance Cloudy\n"
- "-v | --video capture Viedeo of 10s\n"
- "-a | --Set AE Set Auto exposure\n"
- "-f | --Set Flashlight Set flashlight ON 5s OFF\n"
- "-q | --quit stop preview and quit this app\n");
- ```
-
- demo中其他功能会调用不同的HDI接口去实现，与PreviewOn()接口类似，这里不再赘述，具体详情可以参见[ohos_camera_demo](https://gitee.com/openharmony/drivers_peripheral/tree/master/camera/hal/init)。
+ ```
+ static void ManuList(const std::shared_ptr& mainDemo,
+ const int argc, char** argv)
+ {
+ int idx, c;
+ int awb = 1;
+ constexpr char shortOptions[] = "h:cwvaqof:";
+ c = getopt_long(argc, argv, shortOptions, longOptions, &idx);
+ while(1) {
+ switch (c) {
+ case 'h':
+ c = PutMenuAndGetChr(); // 打印菜单
+ break;
+
+ case 'f':
+ FlashLightTest(mainDemo); // 手电筒功能测试
+ c = PutMenuAndGetChr();
+ break;
+ case 'o':
+ OfflineTest(mainDemo); // Offline功能测试
+ c = PutMenuAndGetChr();
+ break;
+ case 'c':
+ CaptureTest(mainDemo); // Capture功能测试
+ c = PutMenuAndGetChr();
+ break;
+ case 'w': // AWB功能测试
+ if (awb) {
+ mainDemo->SetAwbMode(OHOS_CAMERA_AWB_MODE_INCANDESCENT);
+ } else {
+ mainDemo->SetAwbMode(OHOS_CAMERA_AWB_MODE_OFF);
+ }
+ awb = !awb;
+ c = PutMenuAndGetChr();
+ break;
+ case 'a': // AE功能测试
+ mainDemo->SetAeExpo();
+ c = PutMenuAndGetChr();
+ break;
+ case 'v': // Video功能测试
+ VideoTest(mainDemo);
+ c = PutMenuAndGetChr();
+ break;
+ case 'q': // 退出demo
+ PreviewOff(mainDemo);
+ mainDemo->QuitDemo();
+ exit(EXIT_SUCCESS);
+
+ default:
+ CAMERA_LOGE("main test: command error please retry input command");
+ c = PutMenuAndGetChr();
+ break;
+ }
+ }
+ }
+ ```
+
+ PutMenuAndGetChr()接口打印了demo程序的菜单，并调用fgets()等待从控制台输入命令，内容如下：
+
+ ```
+ static int PutMenuAndGetChr(void)
+ {
+ constexpr uint32_t inputCount = 50;
+ int c = 0;
+ char strs[inputCount];
+ Usage(stdout);
+ CAMERA_LOGD("pls input command(input -q exit this app)\n");
+ fgets(strs, inputCount, stdin);
+
+ for (int i = 0; i < inputCount; i++) {
+ if (strs[i] != '-') {
+ c = strs[i];
+ break;
+ }
+ }
+ return c;
+ }
+ ```
+
+ 控制台输出菜单详情如下：
+
+ ```
+ "Options:\n"
+ "-h | --help Print this message\n"
+ "-o | --offline stream offline test\n"
+ "-c | --capture capture one picture\n"
+ "-w | --set WB Set white balance Cloudy\n"
+ "-v | --video capture Viedeo of 10s\n"
+ "-a | --Set AE Set Auto exposure\n"
+ "-f | --Set Flashlight Set flashlight ON 5s OFF\n"
+ "-q | --quit stop preview and quit this app\n");
+ ```
+
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