关于openharmony:OpenHarmony-32-Beta多媒体系列视频录制

一、简介

媒体子系统为开发者提供了媒体相干的很多性能，本文针对其中的视频录制性能做个具体的介绍。首先，我将通过媒体子系统提供的视频录制Test代码作为切入点，给大家梳理一下整个录制的流程。

二、目录

foundation/multimedia/camera_framework

├── frameworks
│   ├── js
│   │   └── camera_napi                            #napi实现
│   │       └── src
│   │           ├── input                          #Camera输出
│   │           ├── output                         #Camera输入
│   │           └── session                        #会话治理
│   └── native                                     #native实现
│       └── camera
│           ├── BUILD.gn
│           ├── src
│           │   ├── input                          #Camera输出
│           │   ├── output                         #Camera输入
│           │   └── session                        #会话治理
├── interfaces                                     #接口定义
│   ├── inner_api                                  #外部native实现
│   │   └── native
│   │       ├── camera
│   │       │   └── include
│   │       │       ├── input
│   │       │       ├── output
│   │       │       └── session
│   └── kits                                       #napi接口
│       └── js
│           └── camera_napi
│               ├── BUILD.gn
│               ├── include
│               │   ├── input
│               │   ├── output
│               │   └── session
│               └── @ohos.multimedia.camera.d.ts
└── services                                       #服务端
    └── camera_service
        ├── binder
        │   ├── base
        │   ├── client                             #IPC的客户端
        │   │   └── src
        │   └── server                             #IPC的服务端
        │       └── src
        └── src

三、录制的总体流程

四、Native接口应用

在OpenAtom OpenHarmony（以下简称“OpenHarmony”）零碎中，多媒体子系统通过N-API接口提供给下层JS调用，N-API相当于是JS和Native之间的桥梁，在OpenHarmony源码中，提供了C++间接调用视频录制性能的例子，foundation/multimedia/camera_framework/interfaces/inner_api/native/test目录中。本文章次要参考了camera_video.cpp文件中的视频录制流程。

首先依据camera_video.cpp的main办法，理解下视频录制的次要流程代码。

int main(int argc, char **argv)
{
    ......

    // 创立CameraManager实例
    sptr<CameraManager> camManagerObj = CameraManager::GetInstance();

    // 设置回调
    camManagerObj->SetCallback(std::make_shared<TestCameraMngerCallback>(testName));

    // 获取反对的相机设施列表
    std::vector<sptr<CameraDevice>> cameraObjList = camManagerObj->GetSupportedCameras();

    // 创立采集会话
    sptr<CaptureSession> captureSession = camManagerObj->CreateCaptureSession();

    // 开始配置采集会话
    captureSession->BeginConfig();

    // 创立CameraInput
    sptr<CaptureInput> captureInput = camManagerObj->CreateCameraInput(cameraObjList[0]);
    sptr<CameraInput> cameraInput = (sptr<CameraInput> &)captureInput;

    // 开启CameraInput
    cameraInput->Open();

    // 设置CameraInput的Error回调
    cameraInput->SetErrorCallback(std::make_shared<TestDeviceCallback>(testName));

    // 增加CameraInput实例到采集会话中
    ret = captureSession->AddInput(cameraInput);

    sptr<Surface> videoSurface = nullptr;
    std::shared_ptr<Recorder> recorder = nullptr;

    // 创立Video的Surface
    videoSurface = Surface::CreateSurfaceAsConsumer();

    sptr<SurfaceListener> videoListener = new SurfaceListener("Video", SurfaceType::VIDEO, g_videoFd, videoSurface);

    // 注册Surface的事件监听
    videoSurface->RegisterConsumerListener((sptr<IBufferConsumerListener> &)videoListener);

    // 视频的配置
    VideoProfile videoprofile = VideoProfile(static_cast<CameraFormat>(videoFormat), videosize, videoframerates);

    // 创立VideoOutput实例
    sptr<CaptureOutput> videoOutput = camManagerObj->CreateVideoOutput(videoprofile, videoSurface);

    // 设置VideoOutput的回调
    ((sptr<VideoOutput> &)videoOutput)->SetCallback(std::make_shared<TestVideoOutputCallback>(testName));

    // 增加videoOutput到采集会话中
    ret = captureSession->AddOutput(videoOutput);

    // 提交会话配置
    ret = captureSession->CommitConfig();

    // 开始录制
    ret = ((sptr<VideoOutput> &)videoOutput)->Start();


    sleep(videoPauseDuration);
    MEDIA_DEBUG_LOG("Resume video recording");
    // 暂停录制
    ret = ((sptr<VideoOutput> &)videoOutput)->Resume();

    MEDIA_DEBUG_LOG("Wait for 5 seconds before stop");
    sleep(videoCaptureDuration);
    MEDIA_DEBUG_LOG("Stop video recording");
    // 进行录制
    ret = ((sptr<VideoOutput> &)videoOutput)->Stop();

    MEDIA_DEBUG_LOG("Closing the session");
    // 进行采集会话
    ret = captureSession->Stop();

    MEDIA_DEBUG_LOG("Releasing the session");
    // 开释会话采集
    captureSession->Release();

    // Close video file
    TestUtils::SaveVideoFile(nullptr, 0, VideoSaveMode::CLOSE, g_videoFd);
    cameraInput->Release();
    camManagerObj->SetCallback(nullptr);
    return 0;
}

以上是视频录制的整体流程，其过程次要通过Camera模块反对的能力来实现，其中波及几个重要的类：CaptureSession、CameraInput、VideoOutput。CaptureSession是整个过程的控制者，CameraInput和VideoOutput相当于是设施的输出和输入。

五、调用流程

后续次要针对下面的调用流程，梳理具体的调用流程，不便咱们对理解视频录制的整顿架构有一个更加深刻的理解。

创立CameraManager实例
通过CameraManager::GetInstance()获取CameraManager的实例，后续的一些接口都是通过该实例进行调用的。GetInstance应用了单例模式，在OpenHarmony代码中这种形式很常见。

sptr<CameraManager> &CameraManager::GetInstance()
{
 if (CameraManager::cameraManager_ == nullptr) {
     MEDIA_INFO_LOG("Initializing camera manager for first time!");
     CameraManager::cameraManager_ = new(std::nothrow) CameraManager();
     if (CameraManager::cameraManager_ == nullptr) {
         MEDIA_ERR_LOG("CameraManager::GetInstance failed to new CameraManager");
     }
 }
 return CameraManager::cameraManager_;
}

获取反对的相机设施列表
通过调用CameraManager的GetSupportedCameras()接口，获取设施反对的CameraDevice列表。跟踪代码能够发现serviceProxy_->GetCameras最终会调用到Camera服务端的对应接口。

std::vector<sptr<CameraDevice>> CameraManager::GetSupportedCameras()
{
 CAMERA_SYNC_TRACE;

 std::lock_guard<std::mutex> lock(mutex_);
 std::vector<std::string> cameraIds;
 std::vector<std::shared_ptr<Camera::CameraMetadata>> cameraAbilityList;
 int32_t retCode = -1;
 sptr<CameraDevice> cameraObj = nullptr;
 int32_t index = 0;

 if (cameraObjList.size() > 0) {
     cameraObjList.clear();
 }
 if (serviceProxy_ == nullptr) {
     MEDIA_ERR_LOG("CameraManager::GetCameras serviceProxy_ is null, returning empty list!");
     return cameraObjList;
 }
 std::vector<sptr<CameraDevice>> supportedCameras;
 retCode = serviceProxy_->GetCameras(cameraIds, cameraAbilityList);
 if (retCode == CAMERA_OK) {
     for (auto& it : cameraIds) {
         cameraObj = new(std::nothrow) CameraDevice(it, cameraAbilityList[index++]);
         if (cameraObj == nullptr) {
             MEDIA_ERR_LOG("CameraManager::GetCameras new CameraDevice failed for id={public}%s", it.c_str());
             continue;
         }
         supportedCameras.emplace_back(cameraObj);
     }
 } else {
     MEDIA_ERR_LOG("CameraManager::GetCameras failed!, retCode: %{public}d", retCode);
 }

 ChooseDeFaultCameras(supportedCameras);
 return cameraObjList;
}

创立采集会话
上面是比拟重要的环节，通过调用CameraManager的CreateCaptureSession接口创立采集会话。CameraManager创立采集会话，是通过serviceProxy_->CreateCaptureSession形式进行调用，这里波及到了OpenHarmony中的IPC的调用，serviceProxy_是远端服务在本地的代理，通过这个代理能够调用到具体的服务端，这里是HCameraService。

sptr<CaptureSession> CameraManager::CreateCaptureSession()
{
 CAMERA_SYNC_TRACE;
 sptr<ICaptureSession> captureSession = nullptr;
 sptr<CaptureSession> result = nullptr;
 int32_t retCode = CAMERA_OK;

 if (serviceProxy_ == nullptr) {
     MEDIA_ERR_LOG("CameraManager::CreateCaptureSession serviceProxy_ is null");
     return nullptr;
 }
 retCode = serviceProxy_->CreateCaptureSession(captureSession);
 if (retCode == CAMERA_OK && captureSession != nullptr) {
     result = new(std::nothrow) CaptureSession(captureSession);
     if (result == nullptr) {
         MEDIA_ERR_LOG("Failed to new CaptureSession");
     }
 } else {
     MEDIA_ERR_LOG("Failed to get capture session object from hcamera service!, %{public}d", retCode);
 }
 return result;
}

代码最终来到HCameraService::CreateCaptureSession中，该办法中new了一个HCaptureSession对象，并且将该对象传递给了参数session，所以后面的captureSession对象就是这里new进去的HCaptureSession，后面的CameraManager的CreateCaptureSession()办法中将captureSession封装成CaptureSession对象返回给应用层应用。

int32_t HCameraService::CreateCaptureSession(sptr<ICaptureSession> &session)
{
    CAMERA_SYNC_TRACE;
    sptr<HCaptureSession> captureSession;
    if (streamOperatorCallback_ == nullptr) {
        streamOperatorCallback_ = new(std::nothrow) StreamOperatorCallback();
        if (streamOperatorCallback_ == nullptr) {
            MEDIA_ERR_LOG("HCameraService::CreateCaptureSession streamOperatorCallback_ allocation failed");
            return CAMERA_ALLOC_ERROR;
        }
    }

    std::lock_guard<std::mutex> lock(mutex_);
    OHOS::Security::AccessToken::AccessTokenID callerToken = IPCSkeleton::GetCallingTokenID();
    captureSession = new(std::nothrow) HCaptureSession(cameraHostManager_, streamOperatorCallback_, callerToken);
    if (captureSession == nullptr) {
        MEDIA_ERR_LOG("HCameraService::CreateCaptureSession HCaptureSession allocation failed");
        return CAMERA_ALLOC_ERROR;
    }
    session = captureSession;
    return CAMERA_OK;
}

开始配置采集会话
调用CaptureSession的BeginConfig进行采集会话的配置工作。这个工作最终调用到被封装的HCaptureSession中。

int32_t HCaptureSession::BeginConfig()
{
 CAMERA_SYNC_TRACE;
 if (curState_ == CaptureSessionState::SESSION_CONFIG_INPROGRESS) {
     MEDIA_ERR_LOG("HCaptureSession::BeginConfig Already in config inprogress state!");
     return CAMERA_INVALID_STATE;
 }
 std::lock_guard<std::mutex> lock(sessionLock_);
 prevState_ = curState_;
 curState_ = CaptureSessionState::SESSION_CONFIG_INPROGRESS;
 tempCameraDevices_.clear();
 tempStreams_.clear();
 deletedStreamIds_.clear();
 return CAMERA_OK;
}

创立CameraInput
应用层通过camManagerObj->CreateCameraInput(cameraObjList[0])的形式进行CameraInput的创立，cameraObjList[0]就是后面获取反对设施的第一个。依据CameraDevice创立对应的CameraInput对象。

sptr<CameraInput> CameraManager::CreateCameraInput(sptr<CameraDevice> &camera)
{
 CAMERA_SYNC_TRACE;
 sptr<CameraInput> cameraInput = nullptr;
 sptr<ICameraDeviceService> deviceObj = nullptr;

 if (camera != nullptr) {
     deviceObj = CreateCameraDevice(camera->GetID());
     if (deviceObj != nullptr) {
         cameraInput = new(std::nothrow) CameraInput(deviceObj, camera);
         if (cameraInput == nullptr) {
             MEDIA_ERR_LOG("failed to new CameraInput Returning null in CreateCameraInput");
             return cameraInput;
         }
     } else {
         MEDIA_ERR_LOG("Returning null in CreateCameraInput");
     }
 } else {
     MEDIA_ERR_LOG("CameraManager::CreateCameraInput: Camera object is null");
 }
 return cameraInput;
}

开启CameraInput
调用了CameraInput的Open办法，进行输出设施的启动关上。

void CameraInput::Open()
{
    int32_t retCode = deviceObj_->Open();
    if (retCode != CAMERA_OK) {
        MEDIA_ERR_LOG("Failed to open Camera Input, retCode: %{public}d", retCode);
    }
}

增加CameraInput实例到采集会话中
通过调用captureSession的AddInput办法，将创立的CameraInput对象增加到采集会话的输出中，这样采集会话就晓得采集输出的设施。

int32_t CaptureSession::AddInput(sptr<CaptureInput> &input)
{
 CAMERA_SYNC_TRACE;
 if (input == nullptr) {
     MEDIA_ERR_LOG("CaptureSession::AddInput input is null");
     return CAMERA_INVALID_ARG;
 }
 input->SetSession(this);
 inputDevice_ = input;
 return captureSession_->AddInput(((sptr<CameraInput> &)input)->GetCameraDevice());
}

最终调用到HCaptureSession的AddInput办法，该办法中外围的代码是tempCameraDevices_.emplace_back(localCameraDevice)，将须要增加的CameraDevice插入到tempCameraDevices_容器中。

int32_t HCaptureSession::AddInput(sptr<ICameraDeviceService> cameraDevice)
{
    CAMERA_SYNC_TRACE;
    sptr<HCameraDevice> localCameraDevice = nullptr;

    if (cameraDevice == nullptr) {
        MEDIA_ERR_LOG("HCaptureSession::AddInput cameraDevice is null");
        return CAMERA_INVALID_ARG;
    }
    if (curState_ != CaptureSessionState::SESSION_CONFIG_INPROGRESS) {
        MEDIA_ERR_LOG("HCaptureSession::AddInput Need to call BeginConfig before adding input");
        return CAMERA_INVALID_STATE;
    }
    if (!tempCameraDevices_.empty() || (cameraDevice_ != nullptr && !cameraDevice_->IsReleaseCameraDevice())) {
        MEDIA_ERR_LOG("HCaptureSession::AddInput Only one input is supported");
        return CAMERA_INVALID_SESSION_CFG;
    }
    localCameraDevice = static_cast<HCameraDevice*>(cameraDevice.GetRefPtr());
    if (cameraDevice_ == localCameraDevice) {
        cameraDevice_->SetReleaseCameraDevice(false);
    } else {
        tempCameraDevices_.emplace_back(localCameraDevice);
        CAMERA_SYSEVENT_STATISTIC(CreateMsg("CaptureSession::AddInput"));
    }

    sptr<IStreamOperator> streamOperator;
    int32_t rc = localCameraDevice->GetStreamOperator(streamOperatorCallback_, streamOperator);
    if (rc != CAMERA_OK) {
        MEDIA_ERR_LOG("HCaptureSession::GetCameraDevice GetStreamOperator returned %{public}d", rc);
        localCameraDevice->Close();
        return rc;
    }
    return CAMERA_OK;
}

创立Video的Surface
通过Surface::CreateSurfaceAsConsumer创立Surface。

sptr<Surface> Surface::CreateSurfaceAsConsumer(std::string name, bool isShared)
{
 sptr<ConsumerSurface> surf = new ConsumerSurface(name, isShared);
 GSError ret = surf->Init();
 if (ret != GSERROR_OK) {
     BLOGE("Failure, Reason: consumer surf init failed");
     return nullptr;
 }
 return surf;
}

创立VideoOutput实例
通过调用CameraManager的CreateVideoOutput来创立VideoOutput实例。

sptr<VideoOutput> CameraManager::CreateVideoOutput(VideoProfile &profile, sptr<Surface> &surface)
{
 CAMERA_SYNC_TRACE;
 sptr<IStreamRepeat> streamRepeat = nullptr;
 sptr<VideoOutput> result = nullptr;
 int32_t retCode = CAMERA_OK;
 camera_format_t metaFormat;

 metaFormat = GetCameraMetadataFormat(profile.GetCameraFormat());
 retCode = serviceProxy_->CreateVideoOutput(surface->GetProducer(), metaFormat,
                                            profile.GetSize().width, profile.GetSize().height, streamRepeat);
 if (retCode == CAMERA_OK) {
     result = new(std::nothrow) VideoOutput(streamRepeat);
     if (result == nullptr) {
         MEDIA_ERR_LOG("Failed to new VideoOutput");
     } else {
         std::vector<int32_t> videoFrameRates = profile.GetFrameRates();
         if (videoFrameRates.size() >= 2) { // vaild frame rate range length is 2
             result->SetFrameRateRange(videoFrameRates[0], videoFrameRates[1]);
         }
         POWERMGR_SYSEVENT_CAMERA_CONFIG(VIDEO,
                                         profile.GetSize().width,
                                         profile.GetSize().height);
     }
 } else {
     MEDIA_ERR_LOG("VideoOutpout: Failed to get stream repeat object from hcamera service! %{public}d", retCode);
 }
 return result;
}

该办法中通过IPC的调用最终调用到了HCameraService的CreateVideoOutput(surface->GetProducer(), format, streamRepeat)。

sptr<VideoOutput> CameraManager::CreateVideoOutput(VideoProfile &profile, sptr<Surface> &surface)
{
 CAMERA_SYNC_TRACE;
 sptr<IStreamRepeat> streamRepeat = nullptr;
 sptr<VideoOutput> result = nullptr;
 int32_t retCode = CAMERA_OK;
 camera_format_t metaFormat;

 metaFormat = GetCameraMetadataFormat(profile.GetCameraFormat());
 retCode = serviceProxy_->CreateVideoOutput(surface->GetProducer(), metaFormat,
                                            profile.GetSize().width, profile.GetSize().height, streamRepeat);
 if (retCode == CAMERA_OK) {
     result = new(std::nothrow) VideoOutput(streamRepeat);
     if (result == nullptr) {
         MEDIA_ERR_LOG("Failed to new VideoOutput");
     } else {
         std::vector<int32_t> videoFrameRates = profile.GetFrameRates();
         if (videoFrameRates.size() >= 2) { // vaild frame rate range length is 2
             result->SetFrameRateRange(videoFrameRates[0], videoFrameRates[1]);
         }
         POWERMGR_SYSEVENT_CAMERA_CONFIG(VIDEO,
                                         profile.GetSize().width,
                                         profile.GetSize().height);
     }
 } else {
     MEDIA_ERR_LOG("VideoOutpout: Failed to get stream repeat object from hcamera service! %{public}d", retCode);
 }
 return result;
}

HCameraService的CreateVideoOutput办法中次要创立了HStreamRepeat，并且通过参数传递给后面的CameraManager应用，CameraManager通过传递的HStreamRepeat对象，进行封装，创立出VideoOutput对象。

增加videoOutput到采集会话中，并且提交采集会话
该步骤相似增加CameraInput到采集会话的过程，能够参考后面的流程。

开始录制
通过调用VideoOutput的Start进行录制的操作。

int32_t VideoOutput::Start()
{
 return static_cast<IStreamRepeat *>(GetStream().GetRefPtr())->Start();
}

该办法中会调用到HStreamRepeat的Start办法。

int32_t HStreamRepeat::Start()
{
    CAMERA_SYNC_TRACE;

    if (streamOperator_ == nullptr) {
        return CAMERA_INVALID_STATE;
    }
    if (curCaptureID_ != 0) {
        MEDIA_ERR_LOG("HStreamRepeat::Start, Already started with captureID: %{public}d", curCaptureID_);
        return CAMERA_INVALID_STATE;
    }
    int32_t ret = AllocateCaptureId(curCaptureID_);
    if (ret != CAMERA_OK) {
        MEDIA_ERR_LOG("HStreamRepeat::Start Failed to allocate a captureId");
        return ret;
    }
    std::vector<uint8_t> ability;
    OHOS::Camera::MetadataUtils::ConvertMetadataToVec(cameraAbility_, ability);
    CaptureInfo captureInfo;
    captureInfo.streamIds_ = {streamId_};
    captureInfo.captureSetting_ = ability;
    captureInfo.enableShutterCallback_ = false;
    MEDIA_INFO_LOG("HStreamRepeat::Start Starting with capture ID: %{public}d", curCaptureID_);
    CamRetCode rc = (CamRetCode)(streamOperator_->Capture(curCaptureID_, captureInfo, true));
    if (rc != HDI::Camera::V1_0::NO_ERROR) {
        ReleaseCaptureId(curCaptureID_);
        curCaptureID_ = 0;
        MEDIA_ERR_LOG("HStreamRepeat::Start Failed with error Code:%{public}d", rc);
        ret = HdiToServiceError(rc);
    }
    return ret;
}

外围的代码是streamOperator_->Capture，其中最初一个参数true，示意采集间断数据。

录制完结，保留录制文件

六、总结

本文次要对OpenHarmony 3.2 Beta多媒体子系统的视频录制进行介绍，首先梳理了整体的录制流程，而后对录制过程中的次要步骤进行了具体地剖析。视频录制次要分为以下几个步骤：
（1）获取CameraManager实例。
（2）创立采集会话CaptureSession。
（3）创立CameraInput实例，并且将输出设施增加到CaptureSession中。
（4）创立Video录制须要的Surface。
（5）创立VideoOutput实例，并且将输入增加到CaptureSession中。
（6）提交采集会话的配置。
（7）调用VideoOutput的Start办法，进行视频的录制。
（8）录制完结，保留录制的文件。
对于OpenHarmony 3.2 Beta多媒体系列开发，我之前还分享过
《OpenHarmony 3.2 Beta源码剖析之MediaLibrary》
《OpenHarmony 3.2 Beta多媒体系列——音视频播放框架》
《OpenHarmony 3.2 Beta多媒体系列——音视频播放gstreamer》

这几篇文章，欢送感兴趣的开发者进行浏览。

关于openharmony:OpenHarmony-32-Beta多媒体系列视频录制

一、简介

二、目录

三、录制的总体流程

四、Native接口应用

五、调用流程

六、总结

评论

发表回复取消回复

更多文章

苹果iOS打包的ipa应用无法安装？一篇文章带你了解可能的原因及排查方法

图解Golang：从零开始实现简易版过期LRU缓存

深入解析：基于Delta的线性数据结构模型，打造高效富文本编辑器

轻松管理社交媒体：使用Automa插件实现一键拉黑功能

关于openharmony:OpenHarmony-32-Beta多媒体系列视频录制

一、简介

二、目录

三、录制的总体流程

四、Native接口应用

五、调用流程

六、总结

评论

发表回复 取消回复

更多文章

苹果iOS打包的ipa应用无法安装？一篇文章带你了解可能的原因及排查方法

图解Golang：从零开始实现简易版过期LRU缓存

深入解析：基于Delta的线性数据结构模型，打造高效富文本编辑器

轻松管理社交媒体：使用Automa插件实现一键拉黑功能

发表回复取消回复