Camera Photographing Sample (C/C++)
This topic provides sample code that covers the complete photographing process and the API calling sequence. For details about a single process (such as device input, session management, and photographing), see the corresponding C/C++ development guide links provided in Camera Development Preparations.
Development Process
After obtaining the output stream capabilities supported by the camera, create a photo stream. The development process is as follows:
Sample Code
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Link the dynamic library in the CMake script.
target_link_libraries(entry PUBLIC libohcamera.so libhilog_ndk.z.so) -
Import the NDK APIs on the C++ side, and perform photographing based on the surface ID passed in.
#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; // Create a CameraManager object. Camera_ErrorCode ret = OH_Camera_GetCameraManager(&cameraManager); if (cameraManager == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_Camera_GetCameraMananger failed."); } // Listen for camera status changes. ret = OH_CameraManager_RegisterCallback(cameraManager, GetCameraManagerListener()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_RegisterCallback failed."); } // Obtain the camera list. ret = OH_CameraManager_GetSupportedCameras(cameraManager, &cameras, &size); if (cameras == nullptr || size < 0 || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_GetSupportedCameras failed."); } // Create a camera input stream. ret = OH_CameraManager_CreateCameraInput(cameraManager, &cameras[cameraDeviceIndex], &cameraInput); if (cameraInput == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_CreateCameraInput failed."); } // Listen for camera input errors. ret = OH_CameraInput_RegisterCallback(cameraInput, GetCameraInputListener()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraInput_RegisterCallback failed."); } // Open the camera. ret = OH_CameraInput_Open(cameraInput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraInput_Open failed."); } // Obtain the output streams supported by the camera. 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]; // Create a preview output stream, with the previewSurfaceId parameter set to the ID of the surface provided by the <XComponent>. 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."); } // Listen for preview output errors. ret = OH_PreviewOutput_RegisterCallback(previewOutput, GetPreviewOutputListener()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_PreviewOutput_RegisterCallback failed."); } // Create a photo output stream, with the photoSurfaceId parameter set to the ID of the surface obtained through ImageReceiver. 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."); } // Create a session. ret = OH_CameraManager_CreateCaptureSession(cameraManager, &captureSession); if (captureSession == nullptr || ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CameraManager_CreateCaptureSession failed."); } // Listen for session errors. ret = OH_CaptureSession_RegisterCallback(captureSession, GetCaptureSessionRegister()); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_RegisterCallback failed."); } // Start configuration for the session. ret = OH_CaptureSession_BeginConfig(captureSession); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_BeginConfig failed."); } // Add the camera input stream to the session. ret = OH_CaptureSession_AddInput(captureSession, cameraInput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_AddInput failed."); } // Add the preview output stream to the session. ret = OH_CaptureSession_AddPreviewOutput(captureSession, previewOutput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_AddPreviewOutput failed."); } // Add the photo output stream to the session. ret = OH_CaptureSession_AddPhotoOutput(captureSession, photoOutput); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_AddPhotoOutput failed."); } // Commit the session configuration. ret = OH_CaptureSession_CommitConfig(captureSession); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_CommitConfig failed."); } // Start the session. ret = OH_CaptureSession_Start(captureSession); if (ret != CAMERA_OK) { OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_Start failed."); } // Check whether the camera has flash. 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"); } // Check whether a flash mode is supported. 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"); // Set the flash mode. 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); } // Obtain the flash mode in use. 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"); } // Check whether the continuous auto focus is supported. 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"); } // Obtain the zoom ratio range supported by the camera. 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); } // Set a zoom ratio. 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); } // Obtain the zoom ratio of the camera. 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); } // Take photos without photographing settings. 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); } // Stop the session. 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); } // Release the camera input stream. 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); } // Release the preview output stream. 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); } // Release the photo output stream. 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); } // Release the session. 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); } // Release the resources. 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"); } }