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README
Apache-2.0

Camera组件

简介

相机组件支持相机业务的开发,开发者可以通过已开放的接口实现相机硬件的访问、操作和新功能开发,最常见的操作如:预览、拍照和录像等。

基本概念

  • 拍照

    此功能用于拍摄采集照片。

  • 预览

    此功能用于在开启相机后,在缓冲区内重复采集摄像帧,支持在拍照或录像前进行摄像帧预览显示。

  • 录像

    此功能用于在开始录像后和结束录像前的时间段内,在缓冲区内重复采集摄像帧,支持视频录制。

图 1 相机组件架构图

目录

仓目录结构如下:

/foundation/multimedia/camera_framework   # 相机组件业务代码
├── frameworks                           # 框架代码
│   ├── native                           # 内部接口实现
│   │   ├── camera                       # 相机框架实现
│   │   └── metadata                     # 元数据实现
│   └── js                               # 外部接口实现
│       └── camera_napi                  # 相机NAPI实现
├── interfaces                           # 接口代码
│   ├── inner_api                        # 内部接口
│   └── kits                             # 外部接口
├── LICENSE                              # 许可证文件
├── ohos.build                           # 构建文件
├── sa_profile                           # 服务配置文件
└── services                             # 服务代码
    ├── camera_service                   # 相机服务实现
    └── etc                              # 相机服务配置

使用说明

拍照

拍照的步骤:

  1. 创建缓冲区消费者端监听器(CaptureSurfaceListener)以保存图像。

    class CaptureSurfaceListener : public IBufferConsumerListener {
    public:
        int32_t mode_;
        sptr<Surface> surface_;
    
        void OnBufferAvailable() override
        {
            int32_t flushFence = 0;
            int64_t timestamp = 0;
            OHOS::Rect damage; // initialize the damage
    
            OHOS::sptr<OHOS::SurfaceBuffer> buffer = nullptr;
            surface_->AcquireBuffer(buffer, flushFence, timestamp, damage);
            if (buffer != nullptr) {
                void *addr = buffer->GetVirAddr();
                int32_t size = buffer->GetSize();
    
                // Save the buffer(addr) to a file.
    
                surface_->ReleaseBuffer(buffer, -1);
            }
        }
    };
  2. 获取相机管理器实例并获取相机对象列表。

    sptr<CameraManager> camManagerObj = CameraManager::GetInstance();
    std::vector<sptr<CameraInfo>> cameraObjList = camManagerObj->GetCameras();
  3. 使用相机对象创建相机输入来打开相机。

    sptr<CaptureInput> cameraInput = camManagerObj->CreateCameraInput(cameraObjList[0]);
  4. 创建采集会话。

    sptr<CaptureSession> captureSession = camManagerObj->CreateCaptureSession();
  5. 开始配置采集会话。

    int32_t result = captureSession->BeginConfig();
  6. 将相机输入添加到采集会话。

    result = captureSession->AddInput(cameraInput);
  7. 创建消费者 Surface 并注册监听器以监听缓冲区更新。拍照的宽和高可以配置为所支持的 1280x960 分辨率。

    sptr<Surface> photoSurface = Surface::CreateSurfaceAsConsumer();
    int32_t photoWidth = 1280;
    int32_t photoHeight = 960;
    photoSurface->SetDefaultWidthAndHeight(photoWidth, photoHeight);
    photoSurface->SetUserData(CameraManager::surfaceFormat, std::to_string(OHOS_CAMERA_FORMAT_JPEG));
    sptr<CaptureSurfaceListener> capturelistener = new(std::nothrow) CaptureSurfaceListener();
    capturelistener->mode_ = MODE_PHOTO;
    capturelistener->surface_ = photoSurface;
    photoSurface->RegisterConsumerListener((sptr<IBufferConsumerListener> &)capturelistener);
  8. 使用上面创建的 Surface 创建拍照输出。

    sptr<CaptureOutput> photoOutput = camManagerObj->CreatePhotoOutput(photoSurface);
  9. 将拍照输出添加到采集会话。

    result = captureSession->AddOutput(photoOutput);
  10. 将配置提交到采集会话。

    result = captureSession->CommitConfig();
  11. 拍摄照片。

    result = ((sptr<PhotoOutput> &)photoOutput)->Capture();
  12. 释放采集会话资源。

    captureSession->Release();
  13. 释放相机输入关闭相机。

    cameraInput->Release();

开始和停止预览

开始和停止预览的步骤:

  1. 获取相机管理器实例并获取相机对象列表。

    sptr<CameraManager> camManagerObj = CameraManager::GetInstance();
    std::vector<sptr<CameraInfo>> cameraObjList = camManagerObj->GetCameras();
  2. 使用相机对象创建相机输入来打开相机。

    sptr<CaptureInput> cameraInput = camManagerObj->CreateCameraInput(cameraObjList[0]);
  3. 创建采集会话。

    sptr<CaptureSession> captureSession = camManagerObj->CreateCaptureSession();
  4. 开始配置采集会话。

    int32_t result = captureSession->BeginConfig();
  5. 将相机输入添加到采集会话。

    result = captureSession->AddInput(cameraInput);
  6. 使用从窗口管理器获得的 Surface 创建预览输出用以在显示上渲染。预览的宽和高可以配置为所支持的 640x480 或 832x480 分辨率,如果想保存到文件,可以按照拍照流程提到步骤,创建 Surface,注册监听器以监听缓冲区更新。

    int32_t previewWidth = 640;
    int32_t previewHeight = 480;
    previewSurface->SetUserData(CameraManager::surfaceFormat, std::to_string(OHOS_CAMERA_FORMAT_YCRCB_420_SP));
    sptr<CaptureOutput> previewOutput = camManagerObj->CreateCustomPreviewOutput(previewSurface, previewWidth, previewHeight);
  7. 将预览输出添加到采集会话。

    result = captureSession->AddOutput(previewOutput);
  8. 将配置提交到采集会话。

    result = captureSession->CommitConfig();
  9. 开始预览。

    result = captureSession->Start();
  10. 需要时停止预览。

    result = captureSession->Stop();
  11. 释放采集会话资源。

    captureSession->Release();
  12. 释放相机输入关闭相机。

    cameraInput->Release();

视频录像

视频录像的步骤:

  1. 获取相机管理器实例并获取相机对象列表。

    sptr<CameraManager> camManagerObj = CameraManager::GetInstance();
    std::vector<sptr<CameraInfo>> cameraObjList = camManagerObj->GetCameras();
  2. 使用相机对象创建相机输入来打开相机。

    sptr<CaptureInput> cameraInput = camManagerObj->CreateCameraInput(cameraObjList[0]);
  3. 创建采集会话。

    sptr<CaptureSession> captureSession = camManagerObj->CreateCaptureSession();
  4. 开始配置采集会话。

    int32_t result = captureSession->BeginConfig();
  5. 将相机输入添加到采集会话。

    result = captureSession->AddInput(cameraInput);
  6. 通过 Surface 创建一个视频输出,来与音频合成并保存到文件,Surface 通过 Recoder 获取。如果想仅保存视频缓冲数据到文件里,可以按照拍照流程提到步骤,创建 Surface,注册监听器以监听缓冲区更新。录像的分辨率可以在录制器内配置为所支持的 1280x720 或 640x360 分辨率。

    videoSurface->SetUserData(CameraManager::surfaceFormat, std::to_string(OHOS_CAMERA_FORMAT_YCRCB_420_SP));
    sptr<CaptureOutput> videoOutput = camManagerObj->CreateVideoOutput(videoSurface);
  7. 将视频输出添加到采集会话。

    result = captureSession->AddOutput(videoOutput);
  8. 将配置提交到采集会话。

    result = captureSession->CommitConfig();
  9. 开始视频录制。

    result = ((sptr<VideoOutput> &)videoOutput)->Start();
  10. 需要时停止录制。

    result = ((sptr<VideoOutput> &)videoOutput)->Stop();
  11. 释放采集会话的资源。

    captureSession->Release();
  12. 释放相机输入关闭相机。

    cameraInput->Release();

切换多个照相机设备

以下演示如何切换多个照相机设备。最初在采集会话中有一个视频输出(video output)。如果用户想要切换其他 照相机,现存的相机输入和输出需要先移除并加入新的相机输入和输出(示例中使用的是photo output)。

  1. 获取相机管理器实例并获取相机对象列表。

    sptr<CameraManager> camManagerObj = CameraManager::GetInstance();
    std::vector<sptr<CameraInfo>> cameraObjList = camManagerObj->GetCameras();
  2. 使用相机对象创建相机输入来打开相机。

    sptr<CaptureSession> captureSession = camManagerObj->CreateCaptureSession();
  3. 创建采集会话。

    sptr<CaptureSession> captureSession = camManagerObj->CreateCaptureSession();
  4. 开始配置采集会话。

    int32_t result = captureSession->BeginConfig()
  5. 将相机输入添加到采集会话。

    result = captureSession->AddInput(cameraInput);
  6. 通过Surface创建一个视频输出。

    sptr<CaptureOutput> videoOutput = camManagerObj->CreateVideoOutput(videoSurface);
  7. 将视频输出添加到采集会话。

    result = captureSession->AddOutput(videoOutput);
  8. 将配置提交到采集会话。

    result = captureSession->CommitConfig();
  9. 开始录制视频。

    result = ((sptr<VideoOutput> &)videoOutput)->Start();
  10. 需要时停止录制。

    result = ((sptr<VideoOutput> &)videoOutput)->Stop();
  11. 重新配置会话并移除相机输入和输出。

    int32_t result = captureSession->BeginConfig();
  12. 在新的会话配置中移除相机输入。

    int32_t result = captureSession->RemoveInput(cameraInput);
  13. 同样移除相机输出。

    int32_t result = captureSession->RemoveOutut(videoOutput);
  14. 创建新的相机输入,并把它添加到采集会话。

    sptr<CaptureInput> cameraInput2 = camManagerObj->CreateCameraInput(cameraObjList[1]);
    result = captureSession->AddInput(cameraInput2);
  15. 创建拍照输出,成功创建后将拍照输出添加到采集会话。创建消费者 Surface 并注册监听器以监听新的拍照输出缓冲区更新。这个 Surface 用于新创建的拍照输出。

    // Get the surface
    sptr<Surface> photoSurface = Surface::CreateSurfaceAsConsumer();
    int32_t photoWidth = 1280;
    int32_t photoHeight = 960;
    photoSurface->SetDefaultWidthAndHeight(photoWidth, photoHeight);
    photoSurface->SetUserData(CameraManager::surfaceFormat, std::to_string(OHOS_CAMERA_FORMAT_JPEG));
    sptr<CaptureSurfaceListener> capturelistener = new(std::nothrow) CaptureSurfaceListener();
    capturelistener->mode_ = MODE_PHOTO;
    capturelistener->surface_ = photoSurface;
    photoSurface->RegisterConsumerListener((sptr<IBufferConsumerListener> &)capturelistener);
    
    // Create the Photo Output
    sptr<CaptureOutput> photoOutput = camManagerObj->CreatePhotoOutput(photoSurface);
    
    // Add the output to the capture session
    result = captureSession->AddOutput(photoOutput);
  16. 将配置提交到采集会话。

    result = captureSession->CommitConfig();
  17. 释放被移出会话的相机输入。

    cameraInput->Release();
  18. 拍摄照片。

    result = ((sptr<PhotoOutput> &)photoOutput)->Capture();
  19. 释放采集会话资源。

    captureSession->Release();
  20. 释放相机输入关闭相机。

    cameraInput2->Release();

设置闪光灯

拍照和录像前可以在相机输入里设置闪光灯。

  1. 在照相中设置闪光灯。

    cameraInput->LockForControl();
    cameraInput->SetFlashMode(OHOS_CAMERA_FLASH_MODE_OPEN);
    cameraInput->UnlockForControl();
  2. 在录像中设置闪光灯。

    cameraInput->LockForControl();
    cameraInput->SetFlashMode(OHOS_CAMERA_FLASH_MODE_ALWAYS_OPEN);
    cameraInput->UnlockForControl();
  3. 关闭闪光灯。

    cameraInput->LockForControl();
    cameraInput->SetFlashMode(OHOS_CAMERA_FLASH_MODE_CLOSE);
    cameraInput->UnlockForControl();

相关仓

multimedia_camera_standard

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简介

Implementation of camera device management and camera capture functions | 相机设备和相机采集功能实现 展开 收起
C++ 等 2 种语言
Apache-2.0
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