拍照实现方案(C/C++)
当前示例提供完整的拍照流程及其接口调用顺序的介绍。对于单个流程（如设备输入、会话管理、拍照）的介绍请参考相机开发指导(Native)的具体章节。
开发流程
在获取到相机支持的输出流能力后，开始创建拍照流，开发流程如下。
完整示例
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在CMake脚本中链接相关动态库。
target_link_libraries(entry PUBLIC libohcamera.so libhilog_ndk.z.so) -
cpp侧导入NDK接口，并根据传入的SurfaceId进行拍照。
#include "hilog/log.h" #include "ohcamera/camera.h" #include "ohcamera/camera_input.h" #include "ohcamera/capture_session.h" #include "ohcamera/photo_output.h" #include "ohcamera/preview_output.h" #include "ohcamera/video_output.h" #include "ohcamera/camera_manager.h" void CaptureSessionOnFocusStateChange(Camera_CaptureSession* session, Camera_FocusState focusState) { OH_LOG_INFO(LOG_APP, "CaptureSessionOnFocusStateChange"); } void CaptureSessionOnError(Camera_CaptureSession* session, Camera_ErrorCode errorCode) { OH_LOG_INFO(LOG_APP, "CaptureSessionOnError = %{public}d", errorCode); } CaptureSession_Callbacks* GetCaptureSessionRegister(void) { static CaptureSession_Callbacks captureSessionCallbacks = { .onFocusStateChange = CaptureSessionOnFocusStateChange, .onError = CaptureSessionOnError }; return &captureSessionCallbacks; } void PreviewOutputOnFrameStart(Camera_PreviewOutput* previewOutput) { OH_LOG_INFO(LOG_APP, "PreviewOutputOnFrameStart"); } void PreviewOutputOnFrameEnd(Camera_PreviewOutput* previewOutput, int32_t frameCount) { OH_LOG_INFO(LOG_APP, "PreviewOutputOnFrameEnd = %{public}d", frameCount); } void PreviewOutputOnError(Camera_PreviewOutput* previewOutput, Camera_ErrorCode errorCode) { OH_LOG_INFO(LOG_APP, "PreviewOutputOnError = %{public}d", errorCode); } PreviewOutput_Callbacks* GetPreviewOutputListener(void) { static PreviewOutput_Callbacks previewOutputListener = { .onFrameStart = PreviewOutputOnFrameStart, .onFrameEnd = PreviewOutputOnFrameEnd, .onError = PreviewOutputOnError }; return &previewOutputListener; } void OnCameraInputError(const Camera_Input* cameraInput, Camera_ErrorCode errorCode) { OH_LOG_INFO(LOG_APP, "OnCameraInput errorCode = %{public}d", errorCode); } CameraInput_Callbacks* GetCameraInputListener(void) { static CameraInput_Callbacks cameraInputCallbacks = { .onError = OnCameraInputError }; return &cameraInputCallbacks; } void CameraManagerStatusCallback(Camera_Manager* cameraManager, Camera_StatusInfo* status) { OH_LOG_INFO(LOG_APP, "CameraManagerStatusCallback is called"); } CameraManager_Callbacks* GetCameraManagerListener() { static CameraManager_Callbacks cameraManagerListener = { .onCameraStatus = CameraManagerStatusCallback }; return &cameraManagerListener; } NDKCamera::NDKCamera(char *previewId, char *photoId) { Camera_Manager* cameraManager = nullptr; Camera_Device* cameras = nullptr; Camera_CaptureSession* captureSession = nullptr; Camera_OutputCapability* cameraOutputCapability = nullptr; const Camera_Profile* previewProfile = nullptr; const Camera_Profile* photoProfile = nullptr; Camera_PreviewOutput* previewOutput = nullptr; Camera_PhotoOutput* photoOutput = nullptr; Camera_Input* cameraInput = nullptr; uint32_t size = 0; uint32_t cameraDeviceIndex = 0; char* previewSurfaceId = previewId; char* photoSurfaceId = photoId; // 创建CameraManager对象 Camera_ErrorCode ret = OH_Camera_GetCameraManager(&cameraManager); if (cameraManager == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_Camera_GetCameraMananger failed."); } // 监听相机状态变化 ret = OH_CameraManager_RegisterCallback(cameraManager, GetCameraManagerListener()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_RegisterCallback failed."); } // 获取相机列表 ret = OH_CameraManager_GetSupportedCameras(cameraManager, &cameras, &size); if (cameras == nullptr || size < 0 || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_GetSupportedCameras failed."); } // 创建相机输入流 ret = OH_CameraManager_CreateCameraInput(cameraManager, &cameras[cameraDeviceIndex], &cameraInput); if (cameraInput == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_CreateCameraInput failed."); } // 监听cameraInput错误信息 ret = OH_CameraInput_RegisterCallback(cameraInput, GetCameraInputListener()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraInput_RegisterCallback failed."); } // 打开相机 ret = OH_CameraInput_Open(cameraInput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraInput_Open failed."); } // 获取相机设备支持的输出流能力 ret = OH_CameraManager_GetSupportedCameraOutputCapability(cameraManager, &cameras[cameraDeviceIndex], &cameraOutputCapability); if (cameraOutputCapability == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_GetSupportedCameraOutputCapability failed."); } if (cameraOutputCapability->previewProfilesSize < 0) { OH_LOG_ERROR(LOG_APP, "previewProfilesSize == null"); } previewProfile = cameraOutputCapability->previewProfiles[0]; if (cameraOutputCapability->photoProfilesSize < 0) { OH_LOG_ERROR(LOG_APP, "photoProfilesSize == null"); } photoProfile = cameraOutputCapability->photoProfiles[0]; // 创建预览输出流,其中参数 previewSurfaceId 参考上文 XComponent 组件，预览流为XComponent组件提供的surface ret = OH_CameraManager_CreatePreviewOutput(cameraManager, previewProfile, previewSurfaceId, &previewOutput); if (previewProfile == nullptr || previewOutput == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_CreatePreviewOutput failed."); } // 监听预览输出错误信息 ret = OH_PreviewOutput_RegisterCallback(previewOutput, GetPreviewOutputListener()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_PreviewOutput_RegisterCallback failed."); } // 创建拍照输出流，其中参数 photoSurfaceId 参考上文 ImageReceiver获取的surface ret = OH_CameraManager_CreatePhotoOutput(cameraManager, photoProfile, photoSurfaceId, &photoOutput); if (photoProfile == nullptr || photoOutput == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_CreatePhotoOutput failed."); } //创建会话 ret = OH_CameraManager_CreateCaptureSession(cameraManager, &captureSession); if (captureSession == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_CreateCaptureSession failed."); } // 监听session错误信息 ret = OH_CaptureSession_RegisterCallback(captureSession, GetCaptureSessionRegister()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_RegisterCallback failed."); } // 开始配置会话 ret = OH_CaptureSession_BeginConfig(captureSession); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_BeginConfig failed."); } // 向会话中添加相机输入流 ret = OH_CaptureSession_AddInput(captureSession, cameraInput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_AddInput failed."); } // 向会话中添加预览输出流 ret = OH_CaptureSession_AddPreviewOutput(captureSession, previewOutput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_AddPreviewOutput failed."); } // 向会话中添加拍照输出流 ret = OH_CaptureSession_AddPhotoOutput(captureSession, photoOutput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_AddPhotoOutput failed."); } // 提交会话配置 ret = OH_CaptureSession_CommitConfig(captureSession); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_CommitConfig failed."); } // 启动会话 ret = OH_CaptureSession_Start(captureSession); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_Start failed."); } // 判断设备是否支持闪光灯 Camera_FlashMode flashMode = FLASH_MODE_AUTO; bool hasFlash = false; ret = OH_CaptureSession_HasFlash(captureSession, &hasFlash); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_HasFlash failed."); } if (hasFlash) { OH_LOG_INFO(LOG_APP, "hasFlash success"); } else { OH_LOG_ERROR(LOG_APP, "hasFlash fail"); } // 检测闪光灯模式是否支持 bool isSupported = false; ret = OH_CaptureSession_IsFlashModeSupported(captureSession, flashMode, &isSupported); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_IsFlashModeSupported failed."); } if (isSupported) { OH_LOG_INFO(LOG_APP, "isFlashModeSupported success"); // 设置闪光灯模式 ret = OH_CaptureSession_SetFlashMode(captureSession, flashMode); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_SetFlashMode success."); } else { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_SetFlashMode failed. %{public}d ", ret); } // 获取当前设备的闪光灯模式 ret = OH_CaptureSession_GetFlashMode(captureSession, &flashMode); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_GetFlashMode success. flashMode：%{public}d ", flashMode); } else { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_GetFlashMode failed. %d ", ret); } } else { OH_LOG_ERROR(LOG_APP, "isFlashModeSupported fail"); } // 判断是否支持连续自动变焦模式 Camera_FocusMode focusMode = FOCUS_MODE_CONTINUOUS_AUTO; bool isFocusModeSupported = false; ret = OH_CaptureSession_IsFocusModeSupported(captureSession, focusMode, &isFocusModeSupported); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_IsFocusModeSupported failed."); } if (isFocusModeSupported) { OH_LOG_INFO(LOG_APP, "isFocusModeSupported success"); ret = OH_CaptureSession_SetFocusMode(captureSession, focusMode); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_SetFocusMode failed. %{public}d ", ret); } ret = OH_CaptureSession_GetFocusMode(captureSession, &focusMode); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_GetFocusMode success. focusMode%{public}d ", focusMode); } else { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_GetFocusMode failed. %d ", ret); } } else { OH_LOG_ERROR(LOG_APP, "isFocusModeSupported fail"); } // 获取相机支持的可变焦距比范围 float minZoom; float maxZoom; ret = OH_CaptureSession_GetZoomRatioRange(captureSession, &minZoom, &maxZoom); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_GetZoomRatioRange failed."); } else { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_GetZoomRatioRange success. minZoom: %{public}f, maxZoom:%{public}f", minZoom, maxZoom); } // 设置变焦 ret = OH_CaptureSession_SetZoomRatio(captureSession, maxZoom); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_SetZoomRatio success."); } else { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_SetZoomRatio failed. %{public}d ", ret); } // 获取当前设备的变焦值 ret = OH_CaptureSession_GetZoomRatio(captureSession, &maxZoom); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_GetZoomRatio success. zoom：%{public}f ", maxZoom); } else { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_GetZoomRatio failed. %{public}d ", ret); } // 无拍照设置进行拍照 ret = OH_PhotoOutput_Capture(photoOutput); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_PhotoOutput_Capture success "); } else { OH_LOG_ERROR(LOG_APP, "OH_PhotoOutput_Capture failed. %d ", ret); } // 停止当前会话 ret = OH_CaptureSession_Stop(captureSession); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_Stop success "); } else { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_Stop failed. %d ", ret); } // 释放相机输入流 ret = OH_CameraInput_Close(cameraInput); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CameraInput_Close success "); } else { OH_LOG_ERROR(LOG_APP, "OH_CameraInput_Close failed. %d ", ret); } // 释放预览输出流 ret = OH_PreviewOutput_Release(previewOutput); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_PreviewOutput_Release success "); } else { OH_LOG_ERROR(LOG_APP, "OH_PreviewOutput_Release failed. %d ", ret); } // 释放拍照输出流 ret = OH_PhotoOutput_Release(photoOutput); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_PhotoOutput_Release success "); } else { OH_LOG_ERROR(LOG_APP, "OH_PhotoOutput_Release failed. %d ", ret); } // 释放会话 ret = OH_CaptureSession_Release(captureSession); if (ret == CAMERA_OK) { OH_LOG_INFO(LOG_APP, "OH_CaptureSession_Release success "); } else { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_Release failed. %d ", ret); } // 资源释放 ret = OH_CameraManager_DeleteSupportedCameras(cameraManager, cameras, size); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "Delete Cameras failed."); } else { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_DeleteSupportedCameras. ok"); } ret = OH_CameraManager_DeleteSupportedCameraOutputCapability(cameraManager, cameraOutputCapability); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "Delete Cameras failed."); } else { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_DeleteSupportedCameraOutputCapability. ok"); } ret = OH_Camera_DeleteCameraManager(cameraManager); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "Delete Cameras failed."); } else { OH_LOG_ERROR(LOG_APP, "OH_Camera_DeleteCameraManager. ok"); } }