harmony 鸿蒙@ohos.multimedia.camera (Camera Management)

2022-08-09
浏览 (1064)

@ohos.multimedia.camera (Camera Management)

NOTE

The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import camera from '@ohos.multimedia.camera';

camera.getCameraManager

getCameraManager(context: BaseContext): CameraManager

Obtains a CameraManager instance. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
context	BaseContext	Yes	Application context.

Return value

Type	Description
CameraManager	CameraManager instance obtained.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400201	Camera service fatal error.

Example

import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';

function getCameraManager(context: common.BaseContext): camera.CameraManager|undefined {
  let cameraManager: camera.CameraManager|undefined = undefined;
  try {
    cameraManager = camera.getCameraManager(context);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`The getCameraManager call failed. error code: ${err.code}`);
  }
  return cameraManager;
}

camera.getModeManager

getModeManager(context: BaseContext): ModeManager

Obtains a ModeManager instance. This API returns the result synchronously.

Mode management, as an enhancement to CameraManager, is used to manage advanced camera features such as portrait mode.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
context	BaseContext	Yes	Application context.

Return value

Type	Description
ModeManager	Mode manager.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400201	Camera service fatal error.

Example

import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';

function getModeManager(context: common.BaseContext): camera.ModeManager|undefined {
  let modeManager: camera.ModeManager|undefined = undefined;
  try {
    modeManager = camera.getModeManager(context);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`The getModeManager call failed. error code: ${err.code}`);
  }
  return modeManager;
}

CameraStatus

Enumerates the camera statuses.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
CAMERA_STATUS_APPEAR	0	A camera appears.
CAMERA_STATUS_DISAPPEAR	1	The camera disappears.
CAMERA_STATUS_AVAILABLE	2	The camera is available.
CAMERA_STATUS_UNAVAILABLE	3	The camera is unavailable.

Profile

Defines the camera profile.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
format	CameraFormat	Yes	Output format.
size	Size	Yes	Resolution.

FrameRateRange

Defines the frame rate range.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
min	number	Yes	Minimum frame rate.
max	number	Yes	Maximum frame rate.

VideoProfile

Defines the video profile.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
frameRateRange	FrameRateRange	Yes	Frame rate range, in units of frames per second (FPS).

CameraOutputCapability

Defines the camera output capability.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
previewProfiles	Array<Profile>	Yes	Supported preview profiles.
photoProfiles	Array<Profile>	Yes	Supported shooting profiles.
videoProfiles	Array<VideoProfile>	Yes	Supported video recording profiles.
supportedMetadataObjectTypes	Array<MetadataObjectType>	Yes	Supported metadata object types.

CameraErrorCode

Enumerates the camera error codes, which are returned when an API call is incorrect or the on() API is used to listen for the error status.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
INVALID_ARGUMENT	7400101	A parameter is missing or the parameter type is incorrect.
OPERATION_NOT_ALLOWED	7400102	The operation is not allowed.
SESSION_NOT_CONFIG	7400103	The session is not configured.
SESSION_NOT_RUNNING	7400104	The session is not running.
SESSION_CONFIG_LOCKED	7400105	The session configuration is locked.
DEVICE_SETTING_LOCKED	7400106	The device setting is locked.
CONFLICT_CAMERA	7400107	The device is already started.
DEVICE_DISABLED	7400108	The camera is disabled for security reasons.
DEVICE_PREEMPTED	7400109	The camera is preempted.
SERVICE_FATAL_ERROR	7400201	An error occurs in the camera service.

CameraMode

Enumerates the camera modes.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
PORTRAIT	1	Portrait mode.

FilterType

Enumerates the filter types.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
NONE	0	No filter.
CLASSIC	1	Classic.
DAWN	2	Dawn.
PURE	3	Pure.
GREY	4	Gray.
NATURAL	5	Natural.
MORI	6	Mori.
FAIR	7	Fair.
PINK	8	Pink.

PortraitEffect

Enumerates the portrait effects.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
OFF	0	Disabled.
CIRCLES	1	Circles.

BeautyType

Enumerates the beauty types.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
AUTO	0	Automatic.
SKIN_SMOOTH	1	Skin smoothing.
FACE_SLENDER	2	Face slimming.
SKIN_TONE	3	Skin tone perfection.

CameraManager

Implements camera management. Before calling any API in CameraManager, you must use getCameraManager to obtain a CameraManager instance.

getSupportedCameras

getSupportedCameras(): Array<CameraDevice>

Obtains supported cameras. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Array<CameraDevice>	An array of supported cameras.

Example

import { BusinessError } from '@ohos.base';

function getSupportedCameras(cameraManager: camera.CameraManager): Array<camera.CameraDevice> {
  let cameras: Array<camera.CameraDevice> = [];
  try {
    cameras = cameraManager.getSupportedCameras();
  } catch (error) {
    let err = error as BusinessError;
    console.error(`The getSupportedCameras call failed. error code: ${err.code}`);
  }
  return cameras;
}

getSupportedOutputCapability

getSupportedOutputCapability(camera:CameraDevice): CameraOutputCapability

Obtains the output capability supported by a camera. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

|Name |Type |Mandatory|Description | |————|—————————————————————|–|————————–| |cameraDevice|CameraDevice |Yes|Target camera, which is obtained through getSupportedCameras. |

Return value

Type	Description
CameraOutputCapability	Camera output capability obtained.

Example

function getSupportedOutputCapability(cameraDevice: camera.CameraDevice, cameraManager: camera.CameraManager): camera.CameraOutputCapability {
  let cameraOutputCapability: camera.CameraOutputCapability = cameraManager.getSupportedOutputCapability(cameraDevice);
  return cameraOutputCapability;
}

isCameraMuted

isCameraMuted(): boolean

Checks whether the camera is muted.

Before calling the API, ensure that the camera can be muted. You can use isCameraMuteSupported to check whether the camera can be muted.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
boolean	Returns true if the camera is muted; returns false otherwise.

Example

function isCameraMuted(cameraManager: camera.CameraManager): boolean {
  let isMuted: boolean = cameraManager.isCameraMuted();
  return isMuted;
}

isCameraMuteSupported

isCameraMuteSupported(): boolean

Checks whether the camera can be muted.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
boolean	Returns true if the camera can be muted; returns false otherwise.

Example

function isCameraMuteSupported(cameraManager: camera.CameraManager): boolean {
  let isMuteSupported: boolean = cameraManager.isCameraMuteSupported();
  return isMuteSupported;
}

muteCamera

muteCamera(mute: boolean): void

Mutes or unmutes the camera.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
mute	boolean	Yes	Whether to mute the camera. The value true means to mute the camera, and false means the opposite.

Example

function muteCamera(cameraManager: camera.CameraManager): void {
  let mute: boolean = true;
  cameraManager.muteCamera(mute);
}

createCameraInput

createCameraInput(camera: CameraDevice): CameraInput

Creates a CameraInput instance with the specified CameraDevice object. This API returns the result synchronously.

Required permissions: ohos.permission.CAMERA

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
cameraDevice	CameraDevice	Yes	Target CameraDevice object, which is obtained through getSupportedCameras.

Return value

Type	Description
CameraInput	CameraInput instance created. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect

Example

import { BusinessError } from '@ohos.base';

function createCameraInput(cameraDevice: camera.CameraDevice, cameraManager: camera.CameraManager): camera.CameraInput|undefined {
  let cameraInput: camera.CameraInput|undefined = undefined;
  try {
    cameraInput = cameraManager.createCameraInput(cameraDevice);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The createCameraInput call failed. error code: ${err.code}`);
  }
  return cameraInput;
}

createCameraInput

createCameraInput(position: CameraPosition, type: CameraType): CameraInput

Creates a CameraInput instance with the specified camera position and type. This API returns the result synchronously.

Required permissions: ohos.permission.CAMERA

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
position	CameraPosition	Yes	Camera position, which is obtained through getSupportedCameras. This API obtains a CameraDevice object, which contains the camera position information.
type	CameraType	Yes	Camera type, which is obtained through getSupportedCameras. This API obtains a CameraDevice object, which contains the camera type information.

Return value

Type	Description
CameraInput	CameraInput instance created. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect

Example

import { BusinessError } from '@ohos.base';

function createCameraInput(cameraDevice: camera.CameraDevice, cameraManager: camera.CameraManager): camera.CameraInput|undefined {
  let position: camera.CameraPosition = cameraDevice.cameraPosition;
  let type: camera.CameraType = cameraDevice.cameraType;
  let cameraInput: camera.CameraInput|undefined = undefined;
  try {
    cameraInput = cameraManager.createCameraInput(position, type);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The createCameraInput call failed. error code: ${err.code}`);
  }
  return cameraInput;
}

createPreviewOutput

createPreviewOutput(profile: Profile, surfaceId: string): PreviewOutput

Creates a PreviewOutput instance. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
profile	Profile	Yes	Supported preview profiles, which are obtained through getSupportedOutputCapability.
surfaceId	string	Yes	Surface ID, which is obtained from XComponent or ImageReceiver.

Return value

Type	Description
PreviewOutput	PreviewOutput instance created. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect

Example

import { BusinessError } from '@ohos.base';

function createPreviewOutput(cameraOutputCapability: camera.CameraOutputCapability, cameraManager: camera.CameraManager, surfaceId: string): camera.PreviewOutput|undefined {
  let profile: camera.Profile = cameraOutputCapability.previewProfiles[0];
  let previewOutput: camera.PreviewOutput|undefined = undefined;
  try {
    previewOutput = cameraManager.createPreviewOutput(profile, surfaceId);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The createPreviewOutput call failed. error code: ${err.code}`);
  }
  return previewOutput;
}

createPhotoOutput

createPhotoOutput(profile: Profile, surfaceId: string): PhotoOutput

Creates a PhotoOutput instance. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
profile	Profile	Yes	Supported shooting profiles, which are obtained through getSupportedOutputCapability.
surfaceId	string	Yes	Surface ID, which is obtained from ImageReceiver.

Return value

Type	Description
PhotoOutput	PhotoOutput instance created. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect

Example

import { BusinessError } from '@ohos.base';

function createPhotoOutput(cameraOutputCapability: camera.CameraOutputCapability, cameraManager: camera.CameraManager, surfaceId: string): camera.PhotoOutput|undefined {
  let profile: camera.Profile = cameraOutputCapability.photoProfiles[0];
  let photoOutput: camera.PhotoOutput|undefined = undefined;
  try {
    photoOutput = cameraManager.createPhotoOutput(profile, surfaceId);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The createPhotoOutput call failed. error code: ${err.code}`);
  }
  return photoOutput;
}

createVideoOutput

createVideoOutput(profile: VideoProfile, surfaceId: string): VideoOutput

Creates a VideoOutput instance. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
profile	VideoProfile	Yes	Supported video recording profiles, which are obtained through getSupportedOutputCapability.
surfaceId	string	Yes	Surface ID, which is obtained from VideoRecorder.

Return value

Type	Description
VideoOutput	VideoOutput instance created. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect

Example

import { BusinessError } from '@ohos.base';

function createVideoOutput(cameraOutputCapability: camera.CameraOutputCapability, cameraManager: camera.CameraManager, surfaceId: string): camera.VideoOutput|undefined {
  let profile: camera.VideoProfile = cameraOutputCapability.videoProfiles[0];
  let videoOutput: camera.VideoOutput|undefined = undefined;
  try {
    videoOutput = cameraManager.createVideoOutput(profile, surfaceId);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The createPhotoOutput call failed. error code: ${err.code}`);
  }
  return videoOutput;
}

createMetadataOutput

createMetadataOutput(metadataObjectTypes:Array<MetadataObjectType>): MetadataOutput

Creates a MetadataOutput instance. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
metadataObjectTypes	Array<MetadataObjectType>	Yes	Metadata object types, which are obtained through getSupportedOutputCapability.

Return value

Type	Description
MetadataOutput	MetadataOutput instance created. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect

Example

import { BusinessError } from '@ohos.base';

function createMetadataOutput(cameraManager: camera.CameraManager, cameraOutputCapability: camera.CameraOutputCapability): void {
  let metadataObjectTypes: Array<camera.MetadataObjectType> = cameraOutputCapability.supportedMetadataObjectTypes;
  let metadataOutput: camera.MetadataOutput|undefined = undefined;
  try {
    metadataOutput = cameraManager.createMetadataOutput(metadataObjectTypes);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`createMetadataOutput error. error code: ${err.code}`);
  }
}

createCaptureSession

createCaptureSession(): CaptureSession

Creates a CaptureSession instance. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
CaptureSession	CaptureSession instance created. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function createCaptureSession(cameraManager: camera.CameraManager): camera.CaptureSession|undefined {
  let captureSession: camera.CaptureSession|undefined = undefined;
  try {
    captureSession = cameraManager.createCaptureSession();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`createCaptureSession error. error code: ${err.code}`);
  }
  return captureSession;
}

on(‘cameraStatus’)

on(type: ‘cameraStatus’, callback: AsyncCallback<CameraStatusInfo>): void

Subscribes to camera status events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘cameraStatus’. The event can be listened for when a CameraManager instance is obtained. This event is triggered and the corresponding information is returned only when the device is enabled or disabled.
callback	AsyncCallback<CameraStatusInfo>	Yes	Callback used to return the camera status change.

Example

import { BusinessError } from '@ohos.base';

function registerCameraStatus(cameraManager: camera.CameraManager): void {
  cameraManager.on('cameraStatus', (err: BusinessError, cameraStatusInfo: camera.CameraStatusInfo) => {
    console.log(`camera : ${cameraStatusInfo.camera.cameraId}`);
    console.log(`status: ${cameraStatusInfo.status}`);
  });
}

off(‘cameraStatus’)

off(type: ‘cameraStatus’, callback?: AsyncCallback<CameraStatusInfo>): void

Unsubscribes from camera status events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘cameraStatus’. The event can be listened for when a CameraManager instance is obtained.
callback	AsyncCallback<CameraStatusInfo>	No	Callback used for unsubscription. If a callback is passed in, only the subscription matching that callback is canceled.

Example

function unregisterCameraStatus(cameraManager: camera.CameraManager): void {
  cameraManager.off('cameraStatus');
}

on(‘cameraMute’)

on(type: ‘cameraMute’, callback: AsyncCallback<boolean>): void

Subscribes to camera mute status events. This API uses an asynchronous callback to return the result.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘cameraMute’, indicating the camera mute status. The event can be listened for when a CameraManager instance is obtained. This event is triggered and the status is returned when the camera is enabled or disabled.
callback	AsyncCallback<boolean>	Yes	Callback used to return the mute status. The value true means that the camera is enabled, and false means that the camera is disabled.

Example

import { BusinessError } from '@ohos.base';

function registerCameraMute(cameraManager: camera.CameraManager): void {
  cameraManager.on('cameraMute', (err: BusinessError, curMuted: boolean) => {
    let isMuted: boolean = curMuted;
    console.log(`cameraMute status: ${isMuted}`);
  })
}

off(‘cameraMute’)

off(type: ‘cameraMute’, callback?: AsyncCallback<boolean>): void

Unsubscribes from camera mute status events. This API uses an asynchronous callback to return the result.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘cameraMute’, indicating the camera mute status. The event can be listened for when a CameraManager instance is obtained.
callback	AsyncCallback<boolean>	No	Callback used for unsubscription. If a callback is passed in, only the subscription matching that callback is canceled.

Example

import { BusinessError } from '@ohos.base';

function callback(err: BusinessError, curMuetd: boolean): void {
  let isMuted: boolean = curMuetd;
}

function unregisterCameraMute(cameraManager: camera.CameraManager): void {
  cameraManager.on('cameraMute', callback);
  cameraManager.off('cameraMute', callback);
}

isPrelaunchSupported

isPrelaunchSupported(camera: CameraDevice): boolean

Checks whether a camera supports prelaunch.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
camera	CameraDevice	Yes	Camera object.

Return value

Type	Description
boolean	Returns whether the camera supports prelaunch. The value true means that the camera supports prelaunch, and false means the opposite.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect.

Example

import common from '@ohos.app.ability.common';

function isPreLaunchSupported(context: common.BaseContext): boolean {
  let cameraManager: camera.CameraManager = camera.getCameraManager(context);
  let cameras: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
  let isSupported: boolean = false;
  if (cameras && cameras.length >= 1) {
    isSupported = cameraManager.isPrelaunchSupported(cameras[0]);
    console.log(`PreLaunch supported states: ${isSupported}`);
    return isSupported;
  }
  return isSupported;
}

setPrelaunchConfig

setPrelaunchConfig(prelaunchConfig: PrelaunchConfig): void

Sets prelaunch configuration.

Before the setting, use isPrelaunchSupported to check whether the device supports prelaunch.

System API: This is a system API.

Required permissions: ohos.permission.CAMERA

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
prelaunchConfig	PrelaunchConfig	Yes	Prelaunch configuration.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect.
7400102	Operation not allow.

Example

import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';

function setPrelaunchConfig(context: common.BaseContext): void {
  let cameraManager: camera.CameraManager = camera.getCameraManager(context);
  let cameras: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
  if (cameras && cameras.length >= 1) {
    let cameraDevice: camera.CameraDevice = cameras[0];
    if(cameraManager.isPrelaunchSupported(cameraDevice)) {
      try {
        cameraManager.setPrelaunchConfig({cameraDevice: cameraDevice});
      } catch (error) {
        let err = error as BusinessError;
        console.error(`setPrelaunchConfig error. Code: ${err.code}, message: ${err.message}`);
      }
    }
  }
}

prelaunch

prelaunch(): void

Prelaunches the camera. This API is called when a user clicks the system camera icon to start the camera application.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Example

import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';

function preLaunch(context: common.BaseContext): void {
  let cameraManager: camera.CameraManager = camera.getCameraManager(context);
  try {
    cameraManager.prelaunch();
  } catch (error) {
    let err = error as BusinessError;
    console.error(`prelaunch error. Code: ${err.code}, message: ${err.message}`);
  }
}

createDeferredPreviewOutput

createDeferredPreviewOutput(profile: Profile): PreviewOutput

Creates a deferred PreviewOutput instance and adds it to the data stream instead of a common PreviewOutput instance during stream configuration.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
profile	Profile	Yes	Configuration file of the camera preview stream.

Return value

Type	Description
PreviewOutput	Returns a PreviewOutput instance.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect.

Example

import common from '@ohos.app.ability.common';

function getDeferredPreviewOutput(context: common.BaseContext, previewProfile: camera.Profile): camera.PreviewOutput {
  const cameraManager: camera.CameraManager = camera.getCameraManager(context);
  const output: camera.PreviewOutput = cameraManager.createDeferredPreviewOutput(previewProfile);
  return output;
}

ModeManager

Implements camera mode management. Before calling any API in this class, you must use getModeManager to obtain a ModeManager instance.

getSupportedModes

getSupportedModes(device: CameraDevice): Array<CameraMode>

Obtains the modes supported by a camera device. This API returns the result synchronously.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
device	CameraDevice	Yes	CameraDevice instance, which is obtained through getSupportedCameras.

Return value

Type	Description
Array<CameraMode>	Array of the supported modes.

Example

function getSupportedModes(modeManager: camera.ModeManager, cameraDevice: camera.CameraDevice): Array<camera.CameraMode> {
  let cameraModes: Array<camera.CameraMode> = modeManager.getSupportedModes(cameraDevice);
  return cameraModes;
}

getSupportedOutputCapability

getSupportedOutputCapability(device:CameraDevice, mode: CameraMode): CameraOutputCapability

Obtains the output capability supported by a camera device in the specified mode. This API returns the result synchronously.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Return value

Type	Description
CameraOutputCapability	Camera output capability obtained.

Example

function getSupportedOutputCapability(cameraManager: camera.CameraManager, modeManager: camera.ModeManager): camera.CameraOutputCapability|undefined {
  let cameras: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
  if (cameras == undefined||cameras.length <= 0) {
    return undefined;
  }
  let cameraDevice: camera.CameraDevice = cameras[0];
  let cameraModes: Array<camera.CameraMode> = modeManager.getSupportedModes(cameraDevice);
  if (cameraModes === undefined||cameraModes.length <= 0) {
    return undefined;
  }
  let mode: camera.CameraMode = cameraModes[0];
  let cameraOutputCapability: camera.CameraOutputCapability = modeManager.getSupportedOutputCapability(cameraDevice, mode);
  return cameraOutputCapability;
}

createCaptureSession

createCaptureSession(mode: CameraMode): CaptureSession

Creates a session for a mode.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

|Name |Type |Mandatory|Description | |————|—————————————————————|–|————————–| |mode|CameraMode |Yes|Mode, which is obtained by calling getSupportedModes. |

Return value

Type	Description
CaptureSession	CaptureSession instance created.

Example

import { BusinessError } from '@ohos.base';

function createCaptureSession(cameraManager: camera.CameraManager, modeManager: camera.ModeManager): camera.CaptureSession|undefined {
  let cameras: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
  if (cameras == undefined||cameras.length <= 0) {
    return;
  }
  let cameraDevice: camera.CameraDevice = cameras[0];
  let cameraModes: Array<camera.CameraMode> = modeManager.getSupportedModes(cameraDevice);
  if (cameraModes === undefined||cameraModes.length <= 0) {
    return;
  }
  let mode: camera.CameraMode = cameraModes[0];
  let captureSession: camera.CaptureSession|undefined = undefined;
  try {
    captureSession = modeManager.createCaptureSession(mode);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`The createCaptureSession call failed. error code: ${err.code}`);
  }
  return captureSession;
}

PrelaunchConfig

Defines the camera prelaunch configuration.

Currently, the configuration is used for sensor-level prelaunch. It will be used for stream-level prelaunch in a later version.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
cameraDevice	CameraDevice	Yes	Camera object.

CameraStatusInfo

Describes the camera status information.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
camera	CameraDevice	Yes	Camera object.
status	CameraStatus	Yes	Camera status.

CameraPosition

Enumerates the camera positions.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
CAMERA_POSITION_UNSPECIFIED	0	Unspecified position.
CAMERA_POSITION_BACK	1	Rear camera.
CAMERA_POSITION_FRONT	2	Front camera.

CameraType

Enumerates the camera types.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
CAMERA_TYPE_DEFAULT	0	Unspecified camera type.
CAMERA_TYPE_WIDE_ANGLE	1	Wide camera.
CAMERA_TYPE_ULTRA_WIDE	2	Ultra wide camera.
CAMERA_TYPE_TELEPHOTO	3	Telephoto camera.
CAMERA_TYPE_TRUE_DEPTH	4	Camera with depth of field information.

ConnectionType

Enumerates the camera connection types.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
CAMERA_CONNECTION_BUILT_IN	0	Built-in camera.
CAMERA_CONNECTION_USB_PLUGIN	1	Camera connected using USB.
CAMERA_CONNECTION_REMOTE	2	Remote camera.

HostDeviceType

Enumerates the remote camera types.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
UNKNOWN_TYPE	0	Unknown type.
PHONE	0x0E	Camera of a smartphone.
TABLET	0x11	Camera of a tablet.

CameraDevice

Defines the camera device information.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
cameraId	string	Yes	CameraDevice object.
cameraPosition	CameraPosition	Yes	Camera position.
cameraType	CameraType	Yes	Camera type.
connectionType	ConnectionType	Yes	Camera connection type.
hostDeviceName	string	Yes	Name of the remote device. System API: This is a system API.
hostDeviceType	hostDeviceType	Yes	Type of the remote device. System API: This is a system API.

Size

Enumerates the camera output capability.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Readable	Writable	Description
height	number	Yes	Yes	Image height, in pixels.
width	number	Yes	Yes	Image width, in pixels.

Point

Enumerates the point coordinates, which are used for focus and exposure configuration.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
x	number	Yes	X coordinate of a point.
y	number	Yes	Y coordinate of a point.

CameraFormat

Enumerates the camera output formats.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
CAMERA_FORMAT_RGBA_8888	3	RGB image.
CAMERA_FORMAT_YUV_420_SP	1003	YUV 420 SP image.
CAMERA_FORMAT_JPEG	2000	JPEG image.

CameraInput

Provides camera information used in CaptureSession.

open

open(callback: AsyncCallback<void>): void

Opens this camera. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400107	Can not use camera cause of conflict.
7400108	Camera disabled cause of security reason.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function openCameraInput(cameraInput: camera.CameraInput): void {
  cameraInput.open((err: BusinessError) => {
    if (err) {
      console.error(`Failed to open the camera. ${err.code}`);
      return;
    }
    console.log('Callback returned with camera opened.');
  });
}

open

open(): Promise<void>

Opens this camera. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400107	Can not use camera cause of conflict.
7400108	Camera disabled cause of security reason.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function openCameraInput(cameraInput: camera.CameraInput): void {
  cameraInput.open().then(() => {
    console.log('Promise returned with camera opened.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to open the camera. ${err.code}`);
  });
}

close

close(callback: AsyncCallback<void>): void

Closes this camera. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function closeCameraInput(cameraInput: camera.CameraInput): void {
  cameraInput.close((err: BusinessError) => {
    if (err) {
      console.error(`Failed to close the cameras. ${err.code}`);
      return;
    }
    console.log('Callback returned with camera closed.');
  });
}

close

close(): Promise<void>

Closes this camera. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function closeCameraInput(cameraInput: camera.CameraInput): void {
  cameraInput.close().then(() => {
    console.log('Promise returned with camera closed.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to close the cameras. ${err.code}`);
  });
}

on(‘error’)

on(type: ‘error’, camera:CameraDevice, callback: ErrorCallback): void

Subscribes to CameraInput error events. This API uses a callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a CameraInput instance is created. This event is triggered and the result is returned when an error occurs on the camera. For example, if the device is unavailable or a conflict occurs, the error information is returned.
cameraDevice	CameraDevice	Yes	CameraDevice object.
callback	ErrorCallback	Yes	Callback used to return an error code defined in CameraErrorCode.

Example

import { BusinessError } from '@ohos.base';

function registerCameraInputError(cameraInput: camera.CameraInput, cameraDevice: camera.CameraDevice): void {
  cameraInput.on('error', cameraDevice, (error: BusinessError) => {
    console.log(`Camera input error code: ${error.code}`);
  });
}

off(‘error’)

off(type: ‘error’, camera:CameraDevice, callback?: ErrorCallback): void

Unsubscribes from CameraInput error events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a CameraInput instance is created. This event is triggered and the result is returned when an error occurs on the camera. For example, if the device is unavailable or a conflict occurs, the error information is returned.
cameraDevice	CameraDevice	Yes	CameraDevice object.
callback	ErrorCallback	No	Callback used for unsubscription. If a callback is passed in, only the subscription matching that callback is canceled.

Example


function unregisterCameraInputError(cameraInput: camera.CameraInput, cameraDevice: camera.CameraDevice): void {
  cameraInput.off('error', cameraDevice);
}

FlashMode

Enumerates the flash modes.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
FLASH_MODE_CLOSE	0	The flash is off.
FLASH_MODE_OPEN	1	The flash is on.
FLASH_MODE_AUTO	2	The flash mode is auto, indicating that the flash fires automatically depending on the shooting conditions.
FLASH_MODE_ALWAYS_OPEN	3	The flash is steady on.

ExposureMode

Enumerates the exposure modes.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
EXPOSURE_MODE_LOCKED	0	Exposure locked. The metering point cannot be set.
EXPOSURE_MODE_AUTO	1	Auto exposure. The metering point can be set by calling setMeteringPoint.
EXPOSURE_MODE_CONTINUOUS_AUTO	2	Continuous auto exposure. The metering point cannot be set.

FocusMode

Enumerates the focus modes.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
FOCUS_MODE_MANUAL	0	Manual focus. The focal length of the camera can be manually set to change the focus position. However, the focal point cannot be set.
FOCUS_MODE_CONTINUOUS_AUTO	1	Continuous auto focus. The focal point cannot be set.
FOCUS_MODE_AUTO	2	Auto focus. The focal point can be set by calling setFocusPoint, and auto focus is performed once based on the focal point. After the auto focus operation is complete (regardless of whether the focus is successful or fails), the focus mode is locked. To enable the camera to initiate another auto focus, the application must call CONTINUOUS_AUTO again.
FOCUS_MODE_LOCKED	3	Focus locked. The focal point cannot be set.

FocusState

Enumerates the focus states.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
FOCUS_STATE_SCAN	0	Focusing.
FOCUS_STATE_FOCUSED	1	Focused.
FOCUS_STATE_UNFOCUSED	2	Unfocused.

VideoStabilizationMode

Enumerates the video stabilization modes.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
OFF	0	Video stabilization is disabled.
LOW	1	The basic video stabilization algorithm is used.
MIDDLE	2	A video stabilization algorithm with a stabilization effect better than that of the LOW type is used.
HIGH	3	A video stabilization algorithm with a stabilization effect better than that of the MIDDLE type is used.
AUTO	4	Automatic video stabilization is used.

CaptureSession

Implements a shooting session, which saves all CameraInput and CameraOutput instances required to run the camera and requests the camera to complete shooting or video recording.

beginConfig

beginConfig(): void

Starts configuration for the session.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400105	Session config locked.

Example

import { BusinessError } from '@ohos.base';

function beginConfig(captureSession: camera.CaptureSession): void {
  try {
    captureSession.beginConfig();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The beginConfig call failed. error code: ${err.code}`);
  }
}

commitConfig

commitConfig(callback: AsyncCallback<void>): void

Commits the configuration for this CaptureSession instance. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400102	Operation not allow.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function commitConfig(captureSession: camera.CaptureSession): void {
  captureSession.commitConfig((err: BusinessError) => {
    if (err) {
      console.error(`The commitConfig call failed. error code: ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate the commit config success.');
  });
}

commitConfig

commitConfig(): Promise<void>

Commits the configuration for this CaptureSession instance. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400102	Operation not allow.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function commitConfig(captureSession: camera.CaptureSession): void {
  captureSession.commitConfig().then(() => {
    console.log('Promise returned to indicate the commit config success.');
  }).catch((err: BusinessError) => {
    // If the operation fails, error.code is returned and processed.
    console.error(`The commitConfig call failed. error code: ${err.code}`);
  });
}

addInput

addInput(cameraInput: CameraInput): void

Adds a CameraInput instance to the session.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
cameraInput	CameraInput	Yes	CameraInput instance to add.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400102	Operation not allow.

Example

import { BusinessError } from '@ohos.base';

function addInput(captureSession: camera.CaptureSession, cameraInput: camera.CameraInput): void {
  try {
    captureSession.addInput(cameraInput);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The addInput call failed. error code: ${err.code}`);
  }
}

removeInput

removeInput(cameraInput: CameraInput): void

Removes a CameraInput instance from the session.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
cameraInput	CameraInput	Yes	CameraInput instance to remove.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400102	Operation not allow.

Example

import { BusinessError } from '@ohos.base';

function removeInput(captureSession: camera.CaptureSession, cameraInput: camera.CameraInput): void {
  try {
    captureSession.removeInput(cameraInput);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The removeInput call failed. error code: ${err.code}`);
  }
}

addOutput

addOutput(cameraOutput: CameraOutput): void

Adds a CameraOutput instance to the session.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
cameraOutput	CameraOutput	Yes	CameraOutput instance to add.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400102	Operation not allow.

Example

import { BusinessError } from '@ohos.base';

function addOutput(captureSession: camera.CaptureSession, cameraOutput: camera.CameraOutput): void {
  try {
    captureSession.addOutput(cameraOutput);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The addOutput call failed. error code: ${err.code}`);
  }
}

removeOutput

removeOutput(cameraOutput: CameraOutput): void

Removes a CameraOutput instance from the session.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
cameraOutput	CameraOutput	Yes	CameraOutput instance to remove.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400102	Operation not allow.

Example

import { BusinessError } from '@ohos.base';

function removeOutput(captureSession: camera.CaptureSession, previewOutput: camera.PreviewOutput): void {
  try {
    captureSession.removeOutput(previewOutput);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.log(`The removeOutput call failed. error code: ${err.code}`);
  }
}

start

start(callback: AsyncCallback<void>): void

Starts this CaptureSession. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function startCaptureSession(captureSession: camera.CaptureSession): void {
  captureSession.start((err: BusinessError) => {
    if (err) {
      console.error(`Failed to start the session ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate the session start success.');
  });
}

start

start(): Promise<void>

Starts this CaptureSession. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function startCaptureSession(captureSession: camera.CaptureSession): void {
  captureSession.start().then(() => {
    console.log('Promise returned to indicate the session start success.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to start the session ${err.code}`);
  });
}

stop

stop(callback: AsyncCallback<void>): void

Stops this CaptureSession. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function stopCaptureSession(captureSession: camera.CaptureSession): void {
  captureSession.stop((err: BusinessError) => {
    if (err) {
      console.error(`Failed to stop the session ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate the session stop success.');
  });
}

stop

stop(): Promise<void>

Stops this CaptureSession. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function stopCaptureSession(captureSession: camera.CaptureSession): void {
  captureSession.stop().then(() => {
    console.log('Promise returned to indicate the session stop success.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to stop the session ${err.code}`);
  });
}

release

release(callback: AsyncCallback<void>): void

Releases this CaptureSession. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releaseCaptureSession(captureSession: camera.CaptureSession): void {
  captureSession.release((err: BusinessError) => {
    if (err) {
      console.error(`Failed to release the CaptureSession instance ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate that the CaptureSession instance is released successfully.');
  });
}

release

release(): Promise<void>

Releases this CaptureSession. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releaseCaptureSession(captureSession: camera.CaptureSession): void {
  captureSession.release().then(() => {
    console.log('Promise returned to indicate that the CaptureSession instance is released successfully.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to release the CaptureSession instance ${err.code}`);
  });
}

hasFlash

hasFlash(): boolean

Checks whether the device has flash. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
boolean	Returns true if the device has flash; returns false otherwise. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function hasFlash(captureSession: camera.CaptureSession): boolean {
  let status: boolean = false;
  try {
    status = captureSession.hasFlash();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The hasFlash call failed. error code: ${err.code}`);
  }
  return status;
}

isFlashModeSupported

isFlashModeSupported(flashMode: FlashMode): boolean

Checks whether a flash mode is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
flashMode	FlashMode	Yes	Flash mode.

Return value

Type	Description
boolean	Returns true if the flash mode is supported; returns false otherwise. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function isFlashModeSupported(captureSession: camera.CaptureSession): boolean {
  let status: boolean = false;
  try {
    status = captureSession.isFlashModeSupported(camera.FlashMode.FLASH_MODE_AUTO);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The isFlashModeSupported call failed. error code: ${err.code}`);
  }
  return status;
}

setFlashMode

setFlashMode(flashMode: FlashMode): void

Sets a flash mode for the device.

Before the setting, do the following checks:

Use hasFlash to check whether the device has flash.
Use isFlashModeSupported to check whether the device supports the flash mode.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
flashMode	FlashMode	Yes	Flash mode.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setFlashMode(captureSession: camera.CaptureSession): void {
  try {
    captureSession.setFlashMode(camera.FlashMode.FLASH_MODE_AUTO);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The setFlashMode call failed. error code: ${err.code}`);
  }
}

getFlashMode

getFlashMode(): FlashMode

Obtains the flash mode in use.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
FlashMode	Flash mode obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getFlashMode(captureSession: camera.CaptureSession): camera.FlashMode|undefined {
  let flashMode: camera.FlashMode|undefined = undefined;
  try {
    flashMode = captureSession.getFlashMode();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getFlashMode call failed.error code: ${err.code}`);
  }
  return flashMode;
}

isExposureModeSupported

isExposureModeSupported(aeMode: ExposureMode): boolean;

Checks whether an exposure mode is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
aeMode	ExposureMode	Yes	Exposure mode.

Return value

Type	Description
boolean	Returns true if the exposure mode is supported; returns false otherwise. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function isExposureModeSupported(captureSession: camera.CaptureSession): boolean {
  let isSupported: boolean = false;
  try {
    isSupported = captureSession.isExposureModeSupported(camera.ExposureMode.EXPOSURE_MODE_LOCKED);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The isExposureModeSupported call failed. error code: ${err.code}`);
  }
  return isSupported;
}

getExposureMode

getExposureMode(): ExposureMode

Obtains the exposure mode in use.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
ExposureMode	Exposure mode obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getExposureMode(captureSession: camera.CaptureSession): camera.ExposureMode|undefined {
  let exposureMode: camera.ExposureMode|undefined = undefined;
  try {
    exposureMode = captureSession.getExposureMode();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getExposureMode call failed. error code: ${err.code}`);
  }
  return exposureMode;
}

setExposureMode

setExposureMode(aeMode: ExposureMode): void

Sets an exposure mode for the device.

Before the setting, use isExposureModeSupported to check whether the target exposure mode is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
aeMode	ExposureMode	Yes	Exposure mode.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setExposureMode(captureSession: camera.CaptureSession): void {
  try {
    captureSession.setExposureMode(camera.ExposureMode.EXPOSURE_MODE_LOCKED);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The setExposureMode call failed. error code: ${err.code}`);
  }
}

getMeteringPoint

getMeteringPoint(): Point

Obtains the metering point of the device.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Point	Metering point obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getMeteringPoint(captureSession: camera.CaptureSession): camera.Point|undefined {
  let exposurePoint: camera.Point|undefined = undefined;
  try {
    exposurePoint = captureSession.getMeteringPoint();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getMeteringPoint call failed. error code: ${err.code}`);
  }
  return exposurePoint;
}

setMeteringPoint

setMeteringPoint(point: Point): void

Sets the metering point, which is the center point of the metering rectangle. The metering point must be in the coordinate system (0-1), where the upper left corner is {0, 0} and the lower right corner is {1, 1}.

The coordinate system is based on the horizontal device direction with the device’s charging port on the right. If the layout of the preview screen of an application is based on the vertical direction with the charging port on the lower side, the layout width and height are {w, h}, and the touch point is {x, y}, then the coordinate point after conversion is {y/h, 1-x/w}.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
exposurePoint	Point	Yes	Metering point. The value range of x and y must be within [0,1]. If a value less than 0 is passed, the value 0 is used. If a value greater than 1 is passed, the value 1 is used.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setMeteringPoint(captureSession: camera.CaptureSession): void {
  const exposurePoint: camera.Point = {x: 1, y: 1};
  try {
    captureSession.setMeteringPoint(exposurePoint);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The setMeteringPoint call failed. error code: ${err.code}`);
  }
}

getExposureBiasRange

getExposureBiasRange(): Array<number>

Obtains the exposure compensation values of the device.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Array<number>	An array of compensation values. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getExposureBiasRange(captureSession: camera.CaptureSession): Array<number> {
  let biasRangeArray: Array<number> = [];
  try {
    biasRangeArray = captureSession.getExposureBiasRange();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getExposureBiasRange call failed. error code: ${err.code}`);
  }
  return biasRangeArray;
}

setExposureBias

setExposureBias(exposureBias: number): void

Sets an exposure compensation value (EV).

Before the setting, you are advised to use getExposureBiasRange to obtain the supported values.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
exposureBias	number	Yes	EV. The supported EV range can be obtained by calling getExposureBiasRange. If the value passed is not within the supported range, the nearest critical point is used. There is a step for EV. For example, if the step is 0.5 and this parameter is set to 1.2, the EV that takes effect is 1.0. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setExposureBias(captureSession: camera.CaptureSession, biasRangeArray: Array<number>): void {
  if (biasRangeArray && biasRangeArray.length > 0) {
    let exposureBias = biasRangeArray[0];
    try {
      captureSession.setExposureBias(exposureBias);
    } catch (error) {
      // If the operation fails, error.code is returned and processed.
      let err = error as BusinessError;
      console.error(`The setExposureBias call failed. error code: ${err.code}`);
    }
  }
}

getExposureValue

getExposureValue(): number

Obtains the exposure value in use.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
number	Exposure value obtained. There is a step for EV. For example, if the step is 0.5 and this parameter is set to 1.2, the EV that takes effect is 1.0. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getExposureValue(captureSession: camera.CaptureSession): number {
  const invalid_value: number = -1;
  let exposureValue: number = invalid_value;
  try {
    exposureValue = captureSession.getExposureValue();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getExposureValue call failed. error code: ${err.code}`);
  }
  return exposureValue;
}

isFocusModeSupported

isFocusModeSupported(afMode: FocusMode): boolean

Checks whether a focus mode is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
afMode	FocusMode	Yes	Focus mode.

Return value

Type	Description
boolean	Returns true if the focus mode is supported; returns false otherwise. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function isFocusModeSupported(captureSession: camera.CaptureSession): boolean {
  let status: boolean = false;
  try {
    status = captureSession.isFocusModeSupported(camera.FocusMode.FOCUS_MODE_AUTO);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The isFocusModeSupported call failed. error code: ${err.code}`);
  }
  return status;
}

setFocusMode

setFocusMode(afMode: FocusMode): void

Sets a focus mode for the device.

Before the setting, use isFocusModeSupported to check whether the focus mode is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
afMode	FocusMode	Yes	Focus mode.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setFocusMode(captureSession: camera.CaptureSession): void {
  try {
    captureSession.setFocusMode(camera.FocusMode.FOCUS_MODE_AUTO);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The setFocusMode call failed. error code: ${err.code}`);
  }
}

getFocusMode

getFocusMode(): FocusMode

Obtains the focus mode in use.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
FocusMode	Focus mode obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getFocusMode(captureSession: camera.CaptureSession): camera.FocusMode|undefined {
  let afMode: camera.FocusMode|undefined = undefined;
  try {
    afMode = captureSession.getFocusMode();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getFocusMode call failed. error code: ${err.code}`);
  }
  return afMode;
}

setFocusPoint

setFocusPoint(point: Point): void

Sets the focal point. The focal point must be in the coordinate system (0-1), where the upper left corner is {0, 0} and the lower right corner is {1, 1}.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
Point1	Point	Yes	Focal point. The value range of x and y must be within [0,1]. If a value less than 0 is passed, the value 0 is used. If a value greater than 1 is passed, the value 1 is used.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setFocusPoint(captureSession: camera.CaptureSession): void {
  const focusPoint: camera.Point = {x: 1, y: 1};
  try {
    captureSession.setFocusPoint(focusPoint);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The setFocusPoint call failed. error code: ${err.code}`);
  }
}

getFocusPoint

getFocusPoint(): Point

Obtains the focal point of the device.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Point	Focal point obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getFocusPoint(captureSession: camera.CaptureSession): camera.Point|undefined {
  let point: camera.Point|undefined = undefined;
  try {
    point = captureSession.getFocusPoint();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getFocusPoint call failed. error code: ${err.code}`);
  }
  return point;
}

getFocalLength

getFocalLength(): number

Obtains the focal length of the device.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
number	Focal length obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getFocalLength(captureSession: camera.CaptureSession): number {
  const invalid_value: number = -1;
  let focalLength: number = invalid_value;
  try {
    focalLength = captureSession.getFocalLength();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getFocalLength call failed. error code: ${err.code}`);
  }
  return focalLength;
}

getZoomRatioRange

getZoomRatioRange(): Array<number>

Obtains the supported zoom ratio range.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Array<number>	Callback used to return an array containing the minimum and maximum zoom ratios. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getZoomRatioRange(captureSession: camera.CaptureSession): Array<number> {
  let zoomRatioRange: Array<number> = [];
  try {
    zoomRatioRange = captureSession.getZoomRatioRange();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getZoomRatioRange call failed. error code: ${err.code}`);
  }
  return zoomRatioRange;
}

setZoomRatio

setZoomRatio(zoomRatio: number): void

Sets a zoom ratio, with a maximum precision of two decimal places.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
zoomRatio	number	Yes	Zoom ratio. The supported zoom ratio range can be obtained by calling getZoomRatioRange. If the value passed is not within the supported range, the nearest critical point is used.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setZoomRatio(captureSession: camera.CaptureSession, zoomRatioRange: Array<number>): void {
  if (zoomRatioRange === undefined||zoomRatioRange.length <= 0) {
    return;
  }
  let zoomRatio = zoomRatioRange[0];
  try {
    captureSession.setZoomRatio(zoomRatio);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The setZoomRatio call failed. error code: ${err.code}`);
  }
}

getZoomRatio

getZoomRatio(): number

Obtains the zoom ratio in use.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
number	Zoom ratio obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getZoomRatio(captureSession: camera.CaptureSession): number {
  const invalid_value: number = -1;
  let zoomRatio: number = invalid_value;
  try {
    zoomRatio = captureSession.getZoomRatio();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getZoomRatio call failed. error code: ${err.code}`);
  }
  return zoomRatio;
}

isVideoStabilizationModeSupported

isVideoStabilizationModeSupported(vsMode: VideoStabilizationMode): boolean

Checks whether the specified video stabilization mode is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
vsMode	VideoStabilizationMode	Yes	Video stabilization mode.

Return value

Type	Description
boolean	Returns true if the video stabilization mode is supported; returns false otherwise. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function isVideoStabilizationModeSupported(captureSession: camera.CaptureSession): boolean {
  let isSupported: boolean = false;
  try {
    isSupported = captureSession.isVideoStabilizationModeSupported(camera.VideoStabilizationMode.OFF);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The isVideoStabilizationModeSupported call failed. error code: ${err.code}`);
  }
  return isSupported;
}

getActiveVideoStabilizationMode

getActiveVideoStabilizationMode(): VideoStabilizationMode

Obtains the video stabilization mode in use.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
VideoStabilizationMode	Video stabilization mode obtained. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function getActiveVideoStabilizationMode(captureSession: camera.CaptureSession): camera.VideoStabilizationMode|undefined {
  let vsMode: camera.VideoStabilizationMode|undefined = undefined;
  try {
    vsMode = captureSession.getActiveVideoStabilizationMode();
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The getActiveVideoStabilizationMode call failed. error code: ${err.code}`);
  }
  return vsMode;
}

setVideoStabilizationMode

setVideoStabilizationMode(mode: VideoStabilizationMode): void

Sets a video stabilization mode for the device.

Before the setting, use isVideoStabilizationModeSupported to check whether the target video stabilization mode is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
mode	VideoStabilizationMode	Yes	Video stabilization mode.

Return value

Type	Description
CameraErrorCode	If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setVideoStabilizationMode(captureSession: camera.CaptureSession): void {
  try {
    captureSession.setVideoStabilizationMode(camera.VideoStabilizationMode.OFF);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The setVideoStabilizationMode call failed. error code: ${err.code}`);
  }
}

getSupportedFilters

getSupportedFilters(): Array<number>

Obtains the supported filter types.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Array<FilterType>	Array of the supported filter types.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function getSupportedFilters(portraitSession: camera.PortraitSession): Array<camera.FilterType> {
  let filterTypes: Array<camera.FilterType> = portraitSession.getSupportedFilters();
  return filterTypes;
}

setFilter

setFilter(filter: number): void

Sets a filter type.

Before the setting, use getSupportedFilters to obtain the supported filter types and check whether the target filter type is supported.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
filter	number	Yes	Filter type to set.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect.
7400103	Session not config.

Example

function setFilter(portraitSession: camera.PortraitSession, filterTypes: Array<camera.FilterType>): void {
  if (filterTypes === undefined||filterTypes.length <= 0) {
    return;
  }
  portraitSession.setFilter(filterTypes[0]);
}

getFilter

getFilter(): number

Obtains the filter type in use.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
number	Filter type in use. For details, see FilterType.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function getFilter(portraitSession: camera.PortraitSession): number {
  let filterType: number = portraitSession.getFilter();
  return filterType;
}

getSupportedBeautyTypes

getSupportedBeautyTypes(): Array<BeautyType>

Obtains the supported beauty types.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Array<BeautyType>	Array of the supported beauty types.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function getSupportedBeautyTypes(portraitSession: camera.PortraitSession): Array<camera.BeautyType> {
  let beautyTypes: Array<camera.BeautyType> = portraitSession.getSupportedBeautyTypes();
  return beautyTypes;
}

getSupportedBeautyRange

getSupportedBeautyRange(type: BeautyType): Array<number>

Obtains the levels that can be set a beauty type. The beauty levels vary according to the device type. The following table is only an example.

Input Parameter	Example Return Value	Return Value Description
AUTO	[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]	Beauty levels supported when type is set to AUTO. The value 0 means that beauty mode is disabled, and other positive values mean the corresponding automatic beauty levels.
SKIN_SMOOTH	[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]	Beauty levels supported when type is set to SKIN_SMOOTH. The value 0 means that the skin smoothing feature is disabled, and other positive values mean the corresponding skin smoothing levels.
FACE_SLENDER	[0, 1, 2, 3, 4, 5]	Beauty levels supported when type is set to FACE_SLENDER. The value 0 means that the face slimming feature is disabled, and other positive values mean the corresponding face slimming levels.
SKIN_TONE	[-1, 16242611]	Beauty levels supported when type is set to SKIN_TONE. The value -1 means that the skin tone perfection feature is disabled. Other non-negative values mean the skin tone perfection levels represented by RGB, for example, 16242611, which is 0xF7D7B3 in hexadecimal format, where F7, D7, and B3 represent the values of the R channel, G channel, and B channel, respectively.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	BeautyType	Yes	Beauty type.

Return value

Type	Description
Array<number>	Array of levels supported.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function getSupportedBeautyRange(portraitSession: camera.PortraitSession): Array<number> {
  let beautyTypes: Array<camera.BeautyType> = portraitSession.getSupportedBeautyTypes();
  if (beautyTypes === undefined||beautyTypes.length <= 0) {
    return [];
  }
  let beautyLevels: Array<number> = portraitSession.getSupportedBeautyRange(beautyTypes[0]);
  return beautyLevels;
}

setBeauty

setBeauty(type: BeautyType, value: number): void

Sets a beauty type and its level. Beauty mode is turned off only when all the beauty types obtained through getSupportedBeautyTypes are disabled.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	BeautyType	Yes	Beauty type.
value	number	Yes	Beauty level, which can be obtained through getSupportedBeautyRange.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function setBeauty(portraitSession: camera.PortraitSession): void {
  let beautyTypes: Array<camera.BeautyType> = portraitSession.getSupportedBeautyTypes();
  if (beautyTypes === undefined||beautyTypes.length <= 0) {
    return;
  }
  let beautyLevels: Array<number> = portraitSession.getSupportedBeautyRange(beautyTypes[0]);
  if (beautyLevels === undefined||beautyLevels.length <= 0) {
    return;
  }
  portraitSession.setBeauty(beautyTypes[0], beautyLevels[0]);
}

getBeauty

getBeauty(type: BeautyType): number

Obtains the level of the beauty type in use.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	BeautyType	Yes	Beauty type.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function getBeauty(portraitSession: camera.PortraitSession): number {
  const invalid_value: number = -1;
  let beautyTypes = portraitSession.getSupportedBeautyTypes();
  if (beautyTypes === undefined||beautyTypes.length <= 0) {
    return invalid_value;
  }
  let beautyLevels: Array<number> = portraitSession.getSupportedBeautyRange(beautyTypes[0]);
  if (beautyLevels === undefined||beautyLevels.length <= 0) {
    return invalid_value;
  }
  portraitSession.setBeauty(beautyTypes[0], beautyLevels[0]);
  let beautyLevel: number = portraitSession.getBeauty(beautyTypes[0]);
  return beautyLevel;
}

on(‘focusStateChange’)

on(type: ‘focusStateChange’, callback: AsyncCallback<FocusState>): void

Subscribes to focus state events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘focusStateChange’. The event can be listened for when a session is created. This event is triggered only when the camera focus state changes in auto focus mode.
callback	AsyncCallback<FocusState>	Yes	Callback used to return the focus state change.

Example

import { BusinessError } from '@ohos.base';

function registerFocusStateChange(captureSession: camera.CaptureSession): void {
  captureSession.on('focusStateChange', (err: BusinessError, focusState: camera.FocusState) => {
    console.log(`Focus state: ${focusState}`);
  });
}

off(‘focusStateChange’)

off(type: ‘focusStateChange’, callback?: AsyncCallback<FocusState>): void

Unsubscribes from focus state events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘focusStateChange’. The event can be listened for when a session is created.
callback	AsyncCallback<FocusState>	No	Callback used for unsubscription.

Example

function unregisterFocusStateChange(captureSession: camera.CaptureSession): void {
  captureSession.off('focusStateChange');
}

on(‘error’)

on(type: ‘error’, callback: ErrorCallback): void

Subscribes to CaptureSession error events. This API uses a callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a session is created. This event is triggered and the error message is returned when an error occurs during the calling of a session-related API such as beginConfig(), commitConfig(), and addInput.
callback	ErrorCallback	Yes	Callback used to return an error code defined in CameraErrorCode.

Example

import { BusinessError } from '@ohos.base';

function registerCaptureSessionError(captureSession: camera.CaptureSession): void {
  captureSession.on('error', (error: BusinessError) => {
    console.log(`Capture session error code: ${error.code}`);
  });
}

off(‘error’)

off(type: ‘error’, callback?: ErrorCallback): void

Unsubscribes from CaptureSession error events. This API uses a callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a session is created.
callback	ErrorCallback	No	Callback used for unsubscription.

Example

function unregisterCaptureSessionError(captureSession: camera.CaptureSession): void {
  captureSession.off('error');
}

PortraitSession

This class inherits from CaptureSession. It is used to set parameters of portrait mode.

getSupportedPortraitEffects

getSupportedPortraitEffects(): Array<PortraitEffect>

Obtains the supported portrait effects.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Array<PortraitEffect >	Array of the supported portrait effects.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function getSupportedPortraitEffects(portraitSession: camera.PortraitSession): Array<camera.PortraitEffect> {
  let portraitEffects: Array<camera.PortraitEffect> = portraitSession.getSupportedPortraitEffects();
  return portraitEffects;
}

setPortraitEffect

setPortraitEffect(effect: PortraitEffect): void

Sets a portrait effect.

Before the setting, use getSupportedPortraitEffects to obtain the supported portrait effects and check whether the target portrait effect is supported.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

|Name |Type |Mandatory|Description | |————|—————————————————————|–|————————–| |effect|PortraitEffect |Yes|Portrait effect, which can be obtained through getSupportedPortraitEffects.|

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function setPortraitEffect(portraitSession: camera.PortraitSession, portraitEffects: Array<camera.PortraitEffect>): void {
  if (portraitEffects === undefined||portraitEffects.length <= 0) {
    return;
  }
  try {
    portraitSession.setPortraitEffect(portraitEffects[0]);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`The setPortraitEffect call failed. error code: ${err.code}`);
  }
}

getPortraitEffect

getPortraitEffect(): PortraitEffect

Obtains the portrait effect in use.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
PortraitEffect	Portrait effect in use.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

function getSupportedPortraitEffects(portraitSession: camera.PortraitSession): Array<camera.PortraitEffect> {
  let portraitEffects: Array<camera.PortraitEffect> = portraitSession.getSupportedPortraitEffects();
  return portraitEffects;
}

CameraOutput

Implements output information used in a CaptureSession. It is the base class of output.

PreviewOutput

Implements preview output. It inherits CameraOutput.

start

start(callback: AsyncCallback<void>): void

Starts to output preview streams. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function startPreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.start((err: BusinessError) => {
    if (err) {
      console.error(`Failed to start the previewOutput. ${err.code}`);
      return;
    }
    console.log('Callback returned with previewOutput started.');
  });
}

start

start(): Promise<void>

Starts to output preview streams. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.

Example

import { BusinessError } from '@ohos.base';

function startPreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.start().then(() => {
    console.log('Promise returned with previewOutput started.');
  }).catch((err: BusinessError) => {
    console.log('Failed to previewOutput start '+ err.code);
  });
}

stop

stop(callback: AsyncCallback<void>): void

Stops outputting preview streams. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

import { BusinessError } from '@ohos.base';

function stopPreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.stop((err: BusinessError) => {
    if (err) {
      console.error(`Failed to stop the previewOutput. ${err.code}`);
      return;
    }
    console.log('Callback returned with previewOutput stopped.');
  })
}

stop

stop(): Promise<void>

Stops outputting preview streams. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result.

Example

import { BusinessError } from '@ohos.base';

function stopPreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.stop().then(() => {
    console.log('Callback returned with previewOutput stopped.');
  }).catch((err: BusinessError) => {
    console.log('Failed to previewOutput stop '+ err.code);
  });
}

release

release(callback: AsyncCallback<void>): void

Releases output resources. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releasePreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.release((err: BusinessError) => {
    if (err) {
      console.error(`Failed to release the PreviewOutput instance ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate that the PreviewOutput instance is released successfully.');
  });
}

release

release(): Promise<void>

Releases output resources. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releasePreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.release().then(() => {
    console.log('Promise returned to indicate that the PreviewOutput instance is released successfully.');
  }).catch((err: BusinessError) => {
    console.log('Failed to previewOutput release '+ err.code);
  });
}

on(‘frameStart’)

on(type: ‘frameStart’, callback: AsyncCallback<void>): void

Subscribes to preview frame start events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameStart’. The event can be listened for when a previewOutput instance is created. This event is triggered and returned when the bottom layer starts exposure for the first time.
callback	AsyncCallback<void>	Yes	Callback used to return the result. The preview starts as long as this event is returned.

Example

function registerPreviewOutputFrameStart(previewOutput: camera.PreviewOutput): void {
  previewOutput.on('frameStart', () => {
    console.log('Preview frame started');
  });
}

off(‘frameStart’)

off(type: ‘frameStart’, callback?: AsyncCallback<void>): void

Unsubscribes from preview frame start events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameStart’. The event can be listened for when a previewOutput instance is created.
callback	AsyncCallback<void>	No	Callback used for unsubscription.

Example

function unregisterPreviewOutputFrameStart(previewOutput: camera.PreviewOutput): void {
  previewOutput.off('frameStart');
}

on(‘frameEnd’)

on(type: ‘frameEnd’, callback: AsyncCallback<void>): void

Subscribes to preview frame end events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameEnd’. The event can be listened for when a previewOutput instance is created. This event is triggered and returned when the last frame of preview ends.
callback	AsyncCallback<void>	Yes	Callback used to return the result. The preview ends as long as this event is returned.

Example

function registerPreviewOutputFrameEnd(previewOutput: camera.PreviewOutput): void {
  previewOutput.on('frameEnd', () => {
    console.log('Preview frame ended');
  });
}

off(‘frameEnd’)

off(type: ‘frameEnd’, callback?: AsyncCallback<void>): void

Unsubscribes from preview frame end events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameEnd’. The event can be listened for when a previewOutput instance is created.
callback	AsyncCallback<void>	No	Callback used for unsubscription.

Example

function unregisterPreviewOutputFrameEnd(previewOutput: camera.PreviewOutput): void {
  previewOutput.off('frameEnd');
}

on(‘error’)

on(type: ‘error’, callback: ErrorCallback): void

Subscribes to PreviewOutput error events. This API uses a callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a previewOutput instance is created. This event is triggered and the corresponding error message is returned when an error occurs during the use of a preview-related API such as start() or release().
callback	ErrorCallback	Yes	Callback used to return an error code defined in CameraErrorCode.

Example

import { BusinessError } from '@ohos.base';

function registerPreviewOutputError(previewOutput: camera.PreviewOutput): void {
  previewOutput.on('error', (previewOutputError: BusinessError) => {
    console.log(`Preview output error code: ${previewOutputError.code}`);
  })
}

off(‘error’)

off(type: ‘error’, callback?: ErrorCallback): void

Unsubscribes from PreviewOutput error events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a previewOutput instance is created.
callback	ErrorCallback	No	Callback used for unsubscription.

Example

function unregisterPreviewOutputError(previewOutput: camera.PreviewOutput): void {
  previewOutput.off('error');
}

addDeferredSurface

addDeferredSurface(surfaceId: string): void

Adds a surface for delayed preview. This API can run after session.commitConfig() or session.start() is called.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
surfaceId	string	Yes	Surface ID, which is obtained from XComponent.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect

Example

import common from '@ohos.app.ability.common';

async function preview(context: common.BaseContext, cameraInfo: camera.CameraDevice, previewProfile: camera.Profile, photoProfile: camera.Profile, photoSurfaceId: string, previewSurfaceId: string): Promise<void> {
  const cameraManager: camera.CameraManager = camera.getCameraManager(context);
  const cameraInput: camera.CameraInput = cameraManager.createCameraInput(cameraInfo)
  const previewOutput: camera.PreviewOutput = cameraManager.createDeferredPreviewOutput(previewProfile);
  const photoOutput: camera.PhotoOutput = cameraManager.createPhotoOutput(photoProfile, photoSurfaceId);
  const session: camera.CaptureSession  = cameraManager.createCaptureSession();
  session.beginConfig();
  session.addInput(cameraInput);
  session.addOutput(previewOutput);
  session.addOutput(photoOutput);
  await session.commitConfig();
  await session.start();
  previewOutput.addDeferredSurface(previewSurfaceId);
}

ImageRotation

Enumerates the image rotation angles.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
ROTATION_0	0	The image rotates 0 degrees.
ROTATION_90	90	The image rotates 90 degrees.
ROTATION_180	180	The image rotates 180 degrees.
ROTATION_270	270	The image rotates 270 degrees.

Location

Defines geolocation information.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
latitude	number	Yes	Latitude, in degrees.
longitude	number	Yes	Longitude, in degrees.
altitude	number	Yes	Altitude, in meters.

QualityLevel

Enumerates the image quality levels.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
QUALITY_LEVEL_HIGH	0	High image quality.
QUALITY_LEVEL_MEDIUM	1	Medium image quality.
QUALITY_LEVEL_LOW	2	Low image quality.

PhotoCaptureSetting

Defines the settings for photo capture.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
quality	QualityLevel	No	Photo quality.
rotation	ImageRotation	No	Rotation angle of the photo.
location	Location	No	Geolocation information of the photo.
mirror	boolean	No	Whether mirroring is enabled. By default, mirroring is disabled.

PhotoOutput

Implements output information used in a shooting session. This class inherits from CameraOutput.

capture

capture(callback: AsyncCallback<void>): void

Captures a photo with the default shooting parameters. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400104	Session not running.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function capture(photoOutput: camera.PhotoOutput): void {
  photoOutput.capture((err: BusinessError) => {
    if (err) {
      console.error(`Failed to capture the photo ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate the photo capture request success.');
  });
}

capture

capture(): Promise<void>

Captures a photo with the default shooting parameters. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400104	Session not running.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function capture(photoOutput: camera.PhotoOutput): void {
  photoOutput.capture().then(() => {
    console.log('Promise returned to indicate that photo capture request success.');
  }).catch((err: BusinessError) => {
    console.log('Failed to photoOutput capture '+ err.code);
  });
}

capture

capture(setting: PhotoCaptureSetting, callback: AsyncCallback<void>): void

Captures a photo with the specified shooting parameters. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
setting	PhotoCaptureSetting	Yes	Shooting settings.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400104	Session not running.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function capture(photoOutput: camera.PhotoOutput): void {
  let captureLocation: camera.Location = {
    latitude: 0,
    longitude: 0,
    altitude: 0,
  }
  let settings: camera.PhotoCaptureSetting = {
    quality: camera.QualityLevel.QUALITY_LEVEL_LOW,
    rotation: camera.ImageRotation.ROTATION_0,
    location: captureLocation,
    mirror: false
  }
  photoOutput.capture(settings, (err: BusinessError) => {
    if (err) {
      console.error(`Failed to capture the photo ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate the photo capture request success.');
  });
}

capture

capture(setting?: PhotoCaptureSetting): Promise<void>

Captures a photo with the specified shooting parameters. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
setting	PhotoCaptureSetting	No	Shooting parameters. The input of undefined is processed as if no parameters were passed.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400101	Parameter missing or parameter type incorrect
7400104	Session not running.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function capture(photoOutput: camera.PhotoOutput): void {
  let captureLocation: camera.Location = {
    latitude: 0,
    longitude: 0,
    altitude: 0,
  }
  let settings: camera.PhotoCaptureSetting = {
    quality: camera.QualityLevel.QUALITY_LEVEL_LOW,
    rotation: camera.ImageRotation.ROTATION_0,
    location: captureLocation,
    mirror: false
  }
  photoOutput.capture(settings).then(() => {
    console.log('Promise returned to indicate that photo capture request success.');
  }).catch((err: BusinessError) => {
    console.log('Failed to photoOutput capture '+ err.code);
  });
}

isMirrorSupported

isMirrorSupported(): boolean

Checks whether mirroring is supported.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
boolean	Returns true if mirroring is supported; returns false otherwise.

Example

function isMirrorSupported(photoOutput: camera.PhotoOutput): boolean {
  let isSupported: boolean = photoOutput.isMirrorSupported();
  return isSupported;
}

release

release(callback: AsyncCallback<void>): void

Releases output resources. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releasePhotoOutput(photoOutput: camera.PhotoOutput): void {
  photoOutput.release((err: BusinessError) => {
    if (err) {
      console.error(`Failed to release the PreviewOutput instance ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate that the PreviewOutput instance is released successfully.');
  });
}

release

release(): Promise<void>

Releases output resources. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releasePhotoOutput(photoOutput: camera.PhotoOutput): void {
  photoOutput.release().then(() => {
    console.log('Promise returned to indicate that the PreviewOutput instance is released successfully.');
  }).catch((err: BusinessError) => {
    console.log('Failed to photoOutput release '+ err.code);
  });
}

on(‘captureStart’)

on(type: ‘captureStart’, callback: AsyncCallback<number>): void

Subscribes to shooting start events. This API uses an asynchronous callback to return the capture ID.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘captureStart’. The event can be listened for when a photoOutput instance is created. This event is triggered and returned when the bottom layer starts exposure each time a photo is taken.
callback	AsyncCallback<number>	Yes	Callback used to return the capture ID.

Example

import { BusinessError } from '@ohos.base';

function registerPhotoOutputCaptureStart(photoOutput: camera.PhotoOutput): void {
  photoOutput.on('captureStart', (err: BusinessError, captureId: number) => {
    console.log(`photo capture stated, captureId : ${captureId}`);
  });
}

off(‘captureStart’)

off(type: ‘captureStart’, callback?: AsyncCallback<number>): void

Unsubscribes from shooting start events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘captureStart’. The event can be listened for when a photoOutput instance is created.
callback	AsyncCallback<number>	No	Callback used for unsubscription.

Example

function unregisterPhotoOutputCaptureStart(photoOutput: camera.PhotoOutput): void {
  photoOutput.off('captureStart');
}

on(‘frameShutter’)

on(type: ‘frameShutter’, callback: AsyncCallback<FrameShutterInfo>): void

Subscribes to frame shutter events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameShutter’. The event can be listened for when a photoOutput instance is created.
callback	AsyncCallback<FrameShutterInfo>	Yes	Callback used to return the result. A new photographing request can be delivered as long as this event is returned.

Example

import { BusinessError } from '@ohos.base';

function registerPhotoOutputFrameShutter(photoOutput: camera.PhotoOutput): void {
  photoOutput.on('frameShutter', (err: BusinessError, frameShutterInfo: camera.FrameShutterInfo) => {
    console.log(`photo capture end, captureId : ${frameShutterInfo.captureId}`);
    console.log(`Timestamp for frame : ${frameShutterInfo.timestamp}`);
  });
}

off(‘frameShutter’)

off(type: ‘frameShutter’, callback?: AsyncCallback<FrameShutterInfo>): void

Unsubscribes from frame shutter events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameShutter’. The event can be listened for when a photoOutput instance is created.
callback	AsyncCallback<FrameShutterInfo>	No	Callback used for unsubscription.

Example

function unregisterPhotoOutputFrameShutter(photoOutput: camera.PhotoOutput): void {
  photoOutput.off('frameShutter');
}

on(‘captureEnd’)

on(type: ‘captureEnd’, callback: AsyncCallback<CaptureEndInfo>): void

Subscribes to shooting end events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘captureEnd’. The event can be listened for when a photoOutput instance is created. This event is triggered and the corresponding information is returned when the photographing is complete.
callback	AsyncCallback<CaptureEndInfo>	Yes	Callback used to return the result.

Example

import { BusinessError } from '@ohos.base';

function registerPhotoOutputCaptureEnd(photoOutput: camera.PhotoOutput): void {
  photoOutput.on('captureEnd', (err: BusinessError, captureEndInfo: camera.CaptureEndInfo) => {
    console.log(`photo capture end, captureId : ${captureEndInfo.captureId}`);
    console.log(`frameCount : ${captureEndInfo.frameCount}`);
  });
}

off(‘captureEnd’)

off(type: ‘captureEnd’, callback?: AsyncCallback<CaptureEndInfo>): void

Unsubscribes from shooting end events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘captureEnd’. The event can be listened for when a photoOutput instance is created.
callback	AsyncCallback<CaptureEndInfo>	No	Callback used for unsubscription.

Example

function unregisterPhotoOutputCaptureEnd(photoOutput: camera.PhotoOutput): void {
  photoOutput.off('captureEnd');
}

on(‘error’)

on(type: ‘error’, callback: ErrorCallback): void

Subscribes to PhotoOutput error events. This API uses a callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a photoOutput instance is created. This event is triggered and the corresponding error message is returned when an error occurs during the calling of a photographing-related API.
callback	ErrorCallback	Yes	Callback used to return an error code defined in CameraErrorCode.

Example

import { BusinessError } from '@ohos.base';

function registerPhotoOutputError(photoOutput: camera.PhotoOutput): void {
  photoOutput.on('error', (error: BusinessError) => {
    console.log(`Photo output error code: ${error.code}`);
  });
}

off(‘error’)

off(type: ‘error’, callback?: ErrorCallback): void

Unsubscribes from PhotoOutput error events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a photoOutput instance is created.
callback	ErrorCallback	No	Callback used for unsubscription.

Example

function unregisterPhotoOutputError(photoOutput: camera.PhotoOutput): void {
  photoOutput.off('error');
}

isQuickThumbnailSupported

isQuickThumbnailSupported(): boolean

Checks whether the quick thumbnail feature is supported.

This API takes effect after CaptureSession.addOutput and CaptureSession.addInput and before CaptureSession.commitConfig.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
boolean	Returns whether the quick thumbnail feature is supported. The value true means that the quick thumbnail feature is supported, and false means the opposite.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400104	session is not running

Example

import common from '@ohos.app.ability.common';

async function isQuickThumbnailSupported(context: common.BaseContext, photoProfile: camera.Profile, surfaceId: string): Promise<boolean> {
  let cameraManager: camera.CameraManager = camera.getCameraManager(context);
  let cameras: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
  // Create a CaptureSession instance.
  let captureSession: camera.CaptureSession = cameraManager.createCaptureSession();
  // Start configuration for the session.
  captureSession.beginConfig();
  // Add a CameraInput instance to the session.
  let cameraInput: camera.CameraInput = cameraManager.createCameraInput(cameras[0]);
  await cameraInput.open();
  captureSession.addInput(cameraInput);
  // Add the photoOutput object to the session.
  let photoOutput: camera.PhotoOutput = cameraManager.createPhotoOutput(photoProfile, surfaceId);
  captureSession.addOutput(photoOutput);
  let isSupported: boolean = photoOutput.isQuickThumbnailSupported();
  return isSupported;
}

enableQuickThumbnail

enableQuickThumbnail(enabled: boolean): void

Enables or disables the quick thumbnail feature.

This API takes effect after CaptureSession.addOutput and CaptureSession.addInput and before CaptureSession.commitConfig.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
enabled	boolean	Yes	Whether to enable the quick thumbnail feature. The value true means to enable the quick thumbnail feature, and false means the opposite.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400104	session is not running

Example

import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';

async function enableQuickThumbnail(context: common.BaseContext, photoProfile: camera.Profile, surfaceId: string): Promise<void> {
  let cameraManager: camera.CameraManager = camera.getCameraManager(context);
  let cameras: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
  // Create a CaptureSession instance.
  let captureSession: camera.CaptureSession = cameraManager.createCaptureSession();
  // Start configuration for the session.
  captureSession.beginConfig();
  // Add a CameraInput instance to the session.
  let cameraInput: camera.CameraInput = cameraManager.createCameraInput(cameras[0]);
  await cameraInput.open();
  captureSession.addInput(cameraInput);
  // Add a PhotoOutput instance to the session.
  let photoOutput: camera.PhotoOutput = cameraManager.createPhotoOutput(photoProfile, surfaceId);
  captureSession.addOutput(photoOutput);
  let isSupported: boolean = photoOutput.isQuickThumbnailSupported();
  if (!isSupported) {
    console.log('Quick Thumbnail is not supported to be turned on.');
    return;
  }
  try {
    photoOutput.enableQuickThumbnail(true);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`The enableQuickThumbnail call failed. error code: ${err.code}`);
  }
}

on(‘quickThumbnail’)

on(type: ‘quickThumbnail’, callback: AsyncCallback<image.PixelMap>): void

Subscribes to quick thumbnail output events.

The listening takes effect after enableQuickThumbnail(true) is called.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘quickThumbnail’.
callback	AsyncCallback<image.PixelMap>	Yes	Promise that returns a PixelMap instance.

Example

import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';

async function registerQuickThumbnail(context: common.BaseContext, photoProfile: camera.Profile, surfaceId: string): Promise<void> {
  let cameraManager: camera.CameraManager = camera.getCameraManager(context);
  let cameras: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
  // Create a CaptureSession instance.
  let captureSession: camera.CaptureSession = cameraManager.createCaptureSession();
  // Start configuration for the session.
  captureSession.beginConfig();
  // Add a CameraInput instance to the session.
  let cameraInput: camera.CameraInput = cameraManager.createCameraInput(cameras[0]);
  await cameraInput.open();
  captureSession.addInput(cameraInput);
  // Add a PhotoOutput instance to the session.
  let photoOutput: camera.PhotoOutput = cameraManager.createPhotoOutput(photoProfile, surfaceId);
  captureSession.addOutput(photoOutput);
  let isSupported: boolean = photoOutput.isQuickThumbnailSupported();
  if (!isSupported) {
    console.log('Quick Thumbnail is not supported to be turned on.');
    return;
  }
  try {
    photoOutput.enableQuickThumbnail(true);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`The enableQuickThumbnail call failed. error code: ${err.code}`);
  }

  photoOutput.on('quickThumbnail', (err: BusinessError, pixelMap: image.PixelMap) => {
    if (err||pixelMap === undefined) {
      console.error('photoOutput on thumbnail failed');
      return;
    }
    // Display or save the PixelMap instance.
    // do something
  })
}

off(‘quickThumbnail’)

off(type: ‘quickThumbnail’, callback?: AsyncCallback<image.PixelMap>): void

Unsubscribes from quick thumbnail output events.

System API: This is a system API.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘quickThumbnail’.
callback	AsyncCallback<image.PixelMap>	No	Callback used for unsubscription.

Example

function unregisterQuickThumbnail(photoOutput: camera.PhotoOutput): void {
  photoOutput.off('quickThumbnail');
}

FrameShutterInfo

Defines the frame shutter information.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
captureId	number	Yes	ID of this capture action.
timestamp	number	Yes	Timestamp when the frame shutter event is triggered.

CaptureEndInfo

Defines the capture end information.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
captureId	number	Yes	ID of this capture action.
frameCount	number	Yes	Number of frames captured.

VideoOutput

Implements output information used in a video recording session. This class inherits from CameraOutput.

start

start(callback: AsyncCallback<void>): void

Starts video recording. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function startVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.start((err: BusinessError) => {
    if (err) {
      console.error(`Failed to start the video output ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate the video output start success.');
  });
}

start

start(): Promise<void>

Starts video recording. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function startVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.start().then(() => {
    console.log('Promise returned to indicate that start method execution success.');
  }).catch((err: BusinessError) => {
    console.log('Failed to videoOutput start '+ err.code);
  });
}

stop

stop(callback: AsyncCallback<void>): void

Stops video recording. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

import { BusinessError } from '@ohos.base';

function stopVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.stop((err: BusinessError) => {
    if (err) {
      console.error(`Failed to stop the video output ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate the video output stop success.');
  });
}

stop

stop(): Promise<void>

Stops video recording. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result.

Example

import { BusinessError } from '@ohos.base';

function stopVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.stop().then(() => {
    console.log('Promise returned to indicate that stop method execution success.');
  }).catch((err: BusinessError) => {
    console.log('Failed to videoOutput stop '+ err.code);
  });
}

release

release(callback: AsyncCallback<void>): void

Releases output resources. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releaseVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.release((err: BusinessError) => {
    if (err) {
      console.error(`Failed to release the PreviewOutput instance ${err.code}`);
      return;
    }
    console.log('Callback invoked to indicate that the videoOutput instance is released successfully.');
  });
}

release

release(): Promise<void>

Releases output resources. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function releaseVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.release().then(() => {
    console.log('Promise returned to indicate that the videoOutput instance is released successfully.');
  }).catch((err: BusinessError) => {
    console.log('Failed to videoOutput release '+ err.code);
  });
}

on(‘frameStart’)

on(type: ‘frameStart’, callback: AsyncCallback<void>): void

Subscribes to video recording start events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameStart’. The event can be listened for when a videoOutput instance is created. The event is triggered and the corresponding information is returned when the bottom layer starts exposure for the first time.
callback	AsyncCallback<void>	Yes	Callback used to return the result. The recording starts as long as this event is returned.

Example

function registerVideoOutputFrameStart(videoOutput: camera.VideoOutput): void {
  videoOutput.on('frameStart', () => {
    console.log('Video frame started');
  });
}

off(‘frameStart’)

off(type: ‘frameStart’, callback?: AsyncCallback<void>): void

Unsubscribes from video recording start events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameStart’. The event can be listened for when a videoOutput instance is created.
callback	AsyncCallback<void>	No	Callback used for unsubscription.

Example

function unregisterVideoOutputFrameStart(videoOutput: camera.VideoOutput): void {
  videoOutput.off('frameStart');
}

on(‘frameEnd’)

on(type: ‘frameEnd’, callback: AsyncCallback<void>): void

Subscribes to video recording stop events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameEnd’. The event can be listened for when a videoOutput instance is created. This event is triggered and returned when the last frame of recording is complete.
callback	AsyncCallback<void>	Yes	Callback used to return the result. The recording ends as long as this event is returned.

Example

function registerVideoOutputFrameEnd(videoOutput: camera.VideoOutput): void {
  videoOutput.on('frameEnd', () => {
    console.log('Video frame ended');
  });
}

off(‘frameEnd’)

off(type: ‘frameEnd’, callback?: AsyncCallback<void>): void

Unsubscribes from video recording stop events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘frameEnd’. The event can be listened for when a videoOutput instance is created.
callback	AsyncCallback<void>	No	Callback used for unsubscription.

Example

function unregisterVideoOutputFrameEnd(videoOutput: camera.VideoOutput): void {
  videoOutput.off('frameEnd');
}

on(‘error’)

on(type: ‘error’, callback: ErrorCallback): void

Subscribes to VideoOutput error events. This API uses a callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a videoOutput instance is created. This event is triggered and the corresponding error message is returned when an error occurs during the calling of a recording-related API such as start() and release().
callback	ErrorCallback	Yes	Callback used to return an error code defined in CameraErrorCode.

Example

import { BusinessError } from '@ohos.base';

function registerVideoOutputError(videoOutput: camera.VideoOutput): void {
  videoOutput.on('error', (error: BusinessError) => {
    console.log(`Video output error code: ${error.code}`);
  });
}

off(‘error’)

off(type: ‘error’, callback?: ErrorCallback): void

Unsubscribes from VideoOutput error events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a videoOutput instance is created.
callback	ErrorCallback	No	Callback used for unsubscription.

Example

function unregisterVideoOutputError(videoOutput: camera.VideoOutput): void {
  videoOutput.off('error');
}

MetadataOutput

Implements metadata streams. It inherits CameraOutput.

start

start(callback: AsyncCallback<void>): void

Starts to output metadata. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function startMetadataOutput(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.start((err: BusinessError) => {
    if (err) {
      console.error(`Failed to start metadataOutput. ${err.code}`);
      return;
    }
    console.log('Callback returned with metadataOutput started.');
  });
}

start

start(): Promise<void>

Starts to output metadata. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation fails, an error code defined in CameraErrorCode is returned.

Error codes

For details about the error codes, see Camera Error Codes.

ID	Error Message
7400103	Session not config.
7400201	Camera service fatal error.

Example

import { BusinessError } from '@ohos.base';

function startMetadataOutput(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.start().then(() => {
    console.log('Callback returned with metadataOutput started.');
  }).catch((err: BusinessError) => {
    console.log('Failed to metadataOutput start '+ err.code);
  });
}

stop

stop(callback: AsyncCallback<void>): void

Stops outputting metadata. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

import { BusinessError } from '@ohos.base';

function stopMetadataOutput(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.stop((err: BusinessError) => {
    if (err) {
      console.error(`Failed to stop the metadataOutput. ${err.code}`);
      return;
    }
    console.log('Callback returned with metadataOutput stopped.');
  })
}

stop

stop(): Promise<void>

Stops outputting metadata. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Return value

Type	Description
Promise<void>	Promise used to return the result.

Example

import { BusinessError } from '@ohos.base';

function stopMetadataOutput(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.stop().then(() => {
    console.log('Callback returned with metadataOutput stopped.');
  }).catch((err: BusinessError) => {
    console.log('Failed to metadataOutput stop '+ err.code);
  });
}

on(‘metadataObjectsAvailable’)

on(type: ‘metadataObjectsAvailable’, callback: AsyncCallback<Array<MetadataObject>>): void

Subscribes to events indicating available metadata objects. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘metadataObjectsAvailable’. The event can be listened for when a metadataOutput instance is created. This event is triggered and the corresponding metadata is returned when valid metadata is detected.
callback	Callback<Array<MetadataObject>>	Yes	Callback used to return the metadata.

Example

import { BusinessError } from '@ohos.base';

function registerMetadataObjectsAvailable(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.on('metadataObjectsAvailable', (err: BusinessError, metadataObjectArr: Array<camera.MetadataObject>) => {
    console.log(`metadata output metadataObjectsAvailable`);
  });
}

off(‘metadataObjectsAvailable’)

off(type: ‘metadataObjectsAvailable’, callback?: AsyncCallback<Array<MetadataObject>>): void

Unsubscribes from events indicating available metadata objects.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘metadataObjectsAvailable’. The event can be listened for when a metadataOutput instance is created.
callback	Callback<Array<MetadataObject>>	No	Callback used for unsubscription.

Example

function unregisterMetadataObjectsAvailable(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.off('metadataObjectsAvailable');
}

on(‘error’)

on(type: ‘error’, callback: ErrorCallback): void

Subscribes to metadata error events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a metadataOutput instance is created. This event is triggered and the corresponding error message is returned when an error occurs during the calling of a metadata-related API such as start() and release().
callback	ErrorCallback	Yes	Callback used to return an error code defined in CameraErrorCode.

Example

import { BusinessError } from '@ohos.base';

function registerMetadataOutputError(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.on('error', (metadataOutputError: BusinessError) => {
    console.log(`Metadata output error code: ${metadataOutputError.code}`);
  });
}

off(‘error’)

off(type: ‘error’, callback?: ErrorCallback): void

Unsubscribes from metadata error events.

System capability: SystemCapability.Multimedia.Camera.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The value is fixed at ‘error’. The event can be listened for when a metadataOutput instance is created.
callback	ErrorCallback	No	Callback used for unsubscription.

Example

function unregisterMetadataOutputError(metadataOutput: camera.MetadataOutput): void {
  metadataOutput.off('error');
}

MetadataObjectType

Enumerates the metadata object types.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Value	Description
FACE_DETECTION	0	Face detection. The detection point must be in the coordinate system (0-1), where the upper left corner is {0, 0} and the lower right corner is {1, 1}. The coordinate system is based on the horizontal device direction with the device’s charging port on the right. If the layout of a preview screen of an application is based on the vertical direction with the charging port on the lower side, the layout width and height are {w, h} and the return point is {x, y}, then the coordinate point after conversion is {1-y, x}.

Rect

Defines a rectangle.

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
topLeftX	number	Yes	X-axis coordinate of the upper left corner of the rectangle.
topLeftY	number	Yes	Y-axis coordinate of the upper left corner of the rectangle.
width	number	Yes	Width of the rectangle.
height	number	Yes	Height of the rectangle.

MetadataObject

Implements camera metadata, which is the data source of CameraInput. The metadata is obtained through metadataOutput.on(‘metadataObjectsAvailable’).

System capability: SystemCapability.Multimedia.Camera.Core

Name	Type	Mandatory	Description
type	MetadataObjectType	No	Metadata data type. Only face recognition is supported.
timestamp	number	No	Current timestamp, in milliseconds.
boundingBox	Rect	No	Metadata rectangle.

你可能感兴趣的鸿蒙文章

harmony 鸿蒙APIs

harmony 鸿蒙System Common Events (To Be Deprecated Soon)

harmony 鸿蒙System Common Events

harmony 鸿蒙API Reference Document Description

harmony 鸿蒙Enterprise Device Management Overview (for System Applications Only)

harmony 鸿蒙BundleStatusCallback

harmony 鸿蒙@ohos.bundle.innerBundleManager (innerBundleManager)

harmony 鸿蒙@ohos.distributedBundle (Distributed Bundle Management)

harmony 鸿蒙@ohos.bundle (Bundle)

harmony 鸿蒙@ohos.enterprise.EnterpriseAdminExtensionAbility (EnterpriseAdminExtensionAbility)

0 赞

所属分类： 后端技术
本文标签：
版权声明： 原创文章如转载，请注明本文链接: https://www.seaxiang.com/blog/af2829dc0fb241d8832c9c7d4953056d