@ohos.multimedia.avsession (AVSession Management)

The avSession module provides APIs for media playback control so that applications can access the system’s Media Controller.

This module provides the following typical features related to media sessions:

• AVSession: used to set session metadata, playback state information, and more.
• AVSessionController: used to obtain session IDs, send commands and events to sessions, and obtain the session metadata and playback state information.
• AVCastController: used to control playback, listen for remote playback state changes, and obtain the remote playback state in casting scenarios.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import avSession from '@ohos.multimedia.avsession';

avSession.createAVSession¹⁰⁺

createAVSession(context: Context, tag: string, type: AVSessionType): Promise<AVSession>

Creates a media session. This API uses a promise to return the result. An ability can have only one session, and repeated calling of this API fails.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
context	Context	Yes	Application context, which provides application environment information.
tag	string	Yes	Custom session name.
type	AVSessionType	Yes	Session type, which can be audio or video.

Return value

Type	Description
Promise<AVSession>	Promise used to return the media session obtained, which can be used to obtain the session ID, set the metadata and playback state information, and send key events.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

let currentAVSession: avSession.AVSession;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string;  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio").then((data: avSession.AVSession) => {
  currentAVSession = data;
  sessionId = currentAVSession.sessionId;
  console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
}).catch((err: BusinessError) => {
  console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.createAVSession¹⁰⁺

createAVSession(context: Context, tag: string, type: AVSessionType, callback: AsyncCallback<AVSession>): void

Creates a media session. This API uses an asynchronous callback to return the result. An ability can have only one session, and repeated calling of this API fails.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
context	Context	Yes	Application context, which provides application environment information.
tag	string	Yes	Custom session name.
type	AVSessionType	Yes	Session type, which can be audio or video.
callback	AsyncCallback<AVSession>	Yes	Callback used to return the media session obtained, which can be used to obtain the session ID, set the metadata and playback state information, and send key events.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

let currentAVSession: avSession.AVSession;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string;  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    sessionId = currentAVSession.sessionId;
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

avSession.getAllSessionDescriptors

getAllSessionDescriptors(): Promise<Array<Readonly<AVSessionDescriptor>>>

Obtains the descriptors of all sessions. This API uses a promise to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Return value

Type	Description
Promise<Array<Readonly<AVSessionDescriptor>>>	Promise used to return an array of AVSessionDescriptor objects, each of which is read only.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

avSession.getAllSessionDescriptors().then((descriptors: avSession.AVSessionDescriptor) => {
  console.info(`getAllSessionDescriptors : SUCCESS : descriptors.length : ${descriptors.length}`);
  if(descriptors.length > 0 ){
    console.info(`getAllSessionDescriptors : SUCCESS : descriptors[0].isActive : ${descriptors[0].isActive}`);
    console.info(`GetAllSessionDescriptors : SUCCESS : descriptors[0].type : ${descriptors[0].type}`);
    console.info(`GetAllSessionDescriptors : SUCCESS : descriptors[0].sessionTag : ${descriptors[0].sessionTag}`);
  }
}).catch((err: BusinessError) => {
  console.error(`GetAllSessionDescriptors BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.getAllSessionDescriptors

getAllSessionDescriptors(callback: AsyncCallback<Array<Readonly<AVSessionDescriptor>>>): void

Obtains the descriptors of all sessions. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback>>	Yes	Callback used to return an array of AVSessionDescriptor objects, each of which is read only.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

avSession.getAllSessionDescriptors((err: BusinessError, descriptors: avSession.AVSessionDescriptor) => {
  if (err) {
    console.error(`GetAllSessionDescriptors BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetAllSessionDescriptors : SUCCESS : descriptors.length : ${descriptors.length}`);
    if(descriptors.length > 0 ){
        console.info(`getAllSessionDescriptors : SUCCESS : descriptors[0].isActive : ${descriptors[0].isActive}`);
        console.info(`getAllSessionDescriptors : SUCCESS : descriptors[0].type : ${descriptors[0].type}`);
        console.info(`getAllSessionDescriptors : SUCCESS : descriptors[0].sessionTag : ${descriptors[0].sessionTag}`);
    }
  }
});

avSession.getHistoricalSessionDescriptors¹⁰⁺

getHistoricalSessionDescriptors(maxSize?: number): Promise<Array<Readonly<AVSessionDescriptor>>>

Obtains the descriptors of all sessions. This API uses a promise to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
maxSize	number	No	Maximum number of descriptors to obtain. The value ranges from 0 to 10. If this parameter is left blank, the default value 3 is used.

Return value

Type	Description
Promise<Array<Readonly<AVSessionDescriptor>>>	Promise used to return an array of AVSessionDescriptor objects, each of which is read only.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

avSession.getHistoricalSessionDescriptors().then((descriptors: avSession.AVSessionDescriptor) => {
  console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors.length : ${descriptors.length}`);
  if(descriptors.length > 0 ){
    console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].isActive : ${descriptors[0].isActive}`);
    console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].type : ${descriptors[0].type}`);
    console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].sessionTag : ${descriptors[0].sessionTag}`);
    console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].sessionId : ${descriptors[0].sessionId}`);
    console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].elementName.bundleName : ${descriptors[0].elementName.bundleName}`);
  }
}).catch((err: BusinessError) => {
  console.error(`getHistoricalSessionDescriptors BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.getHistoricalSessionDescriptors¹⁰⁺

getHistoricalSessionDescriptors(maxSize: number, callback: AsyncCallback<Array<Readonly<AVSessionDescriptor>>>): void

Obtains the descriptors of all sessions. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
maxSize	number	Yes	Maximum number of descriptors to obtain. The value ranges from 0 to 10. If this parameter is left blank, the default value 3 is used.
callback	AsyncCallback>>	Yes	Callback used to return an array of AVSessionDescriptor objects, each of which is read only.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

avSession.getHistoricalSessionDescriptors(1, (err: BusinessError, descriptors: avSession.AVSessionDescriptor) => {
  if (err) {
    console.error(`getHistoricalSessionDescriptors BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors.length : ${descriptors.length}`);
    if(descriptors.length > 0 ){
        console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].isActive : ${descriptors[0].isActive}`);
        console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].type : ${descriptors[0].type}`);
        console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].sessionTag : ${descriptors[0].sessionTag}`);
        console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].sessionId : ${descriptors[0].sessionId}`);
        console.info(`getHistoricalSessionDescriptors : SUCCESS : descriptors[0].elementName.bundleName : ${descriptors[0].elementName.bundleName}`);
    }
  }
});

avSession.createController

createController(sessionId: string): Promise<AVSessionController>

Creates a session controller based on the session ID. Multiple session controllers can be created. This API uses a promise to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
sessionId	string	Yes	Session ID.

Return value

Type	Description
Promise<AVSessionController>	Promise used to return the session controller created, which can be used to obtain the session ID, send commands and events to sessions, and obtain metadata and playback state information.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let currentAVcontroller: avSession.AVSessionController|undefined = undefined;
avSession.createController(sessionId).then((avcontroller: avSession.AVSessionController) => {
  currentAVcontroller = avcontroller;
  console.info('CreateController : SUCCESS ');
}).catch((err: BusinessError) => {
  console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.createController

createController(sessionId: string, callback: AsyncCallback<AVSessionController>): void

Creates a session controller based on the session ID. Multiple session controllers can be created. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
sessionId	string	Yes	Session ID.
callback	AsyncCallback<AVSessionController>	Yes	Callback used to return the session controller created, which can be used to obtain the session ID, send commands and events to sessions, and obtain metadata and playback state information.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let currentAVcontroller: avSession.AVSessionController|undefined = undefined;
avSession.createController(sessionId, (err: BusinessError, avcontroller: avSession.AVSessionController) => {
  if (err) {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVcontroller = avcontroller;
    console.info('CreateController : SUCCESS ');
  }
});

avSession.castAudio

castAudio(session: SessionToken|‘all’, audioDevices: Array): Promise<void>

Casts a session to a list of devices. This API uses a promise to return the result.

Before calling this API, import the ohos.multimedia.audio module to obtain the descriptors of these audio devices.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
session	SessionToken | ‘all’	Yes	Session token. SessionToken indicates a specific token, and ‘all’ indicates all tokens.
audioDevices	Array<audio.AudioDeviceDescriptor>	Yes	Audio devices.

Return value

Type	Description
Promise<void>	Promise used to return the result. If casting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600104	The remote session connection failed.

Example

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

let audioManager = audio.getAudioManager();
let audioRoutingManager = audioManager.getRoutingManager();
let audioDevices: audio.AudioDeviceDescriptors|undefined = undefined;
audioRoutingManager.getDevices(audio.DeviceFlag.OUTPUT_DEVICES_FLAG).then((data) => {
  audioDevices = data;
  console.info(`Promise returned to indicate that the device list is obtained.`);
}).catch((err: BusinessError) => {
  console.error(`GetDevices BusinessError: code: ${err.code}, message: ${err.message}`);
});

if (audioDevices !== undefined) {
  avSession.castAudio('all', audioDevices as audio.AudioDeviceDescriptors).then(() => {
    console.info(`CreateController : SUCCESS`);
  }).catch((err: BusinessError) => {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

avSession.castAudio

castAudio(session: SessionToken|‘all’, audioDevices: Array, callback: AsyncCallback<void>): void

Casts a session to a list of devices. This API uses an asynchronous callback to return the result.

Before calling this API, import the ohos.multimedia.audio module to obtain the descriptors of these audio devices.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
session	SessionToken | ‘all’	Yes	Session token. SessionToken indicates a specific token, and ‘all’ indicates all tokens.
audioDevices	Array<audio.AudioDeviceDescriptor>	Yes	Audio devices.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the casting is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600104	The remote session connection failed.

Example

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

let audioManager = audio.getAudioManager();
let audioRoutingManager = audioManager.getRoutingManager();
let audioDevices: audio.AudioDeviceDescriptors|undefined = undefined;
audioRoutingManager.getDevices(audio.DeviceFlag.OUTPUT_DEVICES_FLAG).then((data) => {
  audioDevices = data;
  console.info(`Promise returned to indicate that the device list is obtained.`);
}).catch((err: BusinessError) => {
  console.error(`GetDevices BusinessError: code: ${err.code}, message: ${err.message}`);
});

if (audioDevices !== undefined) {
  avSession.castAudio('all', audioDevices as audio.AudioDeviceDescriptors, (err: BusinessError) => {
    if (err) {
      console.error(`CastAudio BusinessError: code: ${err.code}, message: ${err.message}`);
    } else {
      console.info(`CastAudio : SUCCESS `);
    }
  });
}

SessionToken

Describes the information about a session token.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Name	Type	Mandatory	Description
sessionId	string	Yes	Session ID.
pid	number	No	Process ID of the session.
uid	number	No	User ID.

avSession.on(‘sessionCreate’)

on(type: ‘sessionCreate’, callback: (session: AVSessionDescriptor) => void): void

Subscribes to session creation events.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘sessionCreate’ is triggered when a session is created.
callback	(session: AVSessionDescriptor) => void	Yes	Callback used to report the session descriptor.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.on('sessionCreate', (descriptor: avSession.AVSessionDescriptor) => {
  console.info(`on sessionCreate : isActive : ${descriptor.isActive}`);
  console.info(`on sessionCreate : type : ${descriptor.type}`);
  console.info(`on sessionCreate : sessionTag : ${descriptor.sessionTag}`);
});

avSession.on(‘sessionDestroy’)

on(type: ‘sessionDestroy’, callback: (session: AVSessionDescriptor) => void): void

Subscribes to session destruction events.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘sessionDestroy’ is triggered when a session is destroyed.
callback	(session: AVSessionDescriptor) => void	Yes	Callback used to report the session descriptor.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.on('sessionDestroy', (descriptor: avSession.AVSessionDescriptor) => {
  console.info(`on sessionDestroy : isActive : ${descriptor.isActive}`);
  console.info(`on sessionDestroy : type : ${descriptor.type}`);
  console.info(`on sessionDestroy : sessionTag : ${descriptor.sessionTag}`);
});

avSession.on(‘topSessionChange’)

on(type: ‘topSessionChange’, callback: (session: AVSessionDescriptor) => void): void

Subscribes to top session change events.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘topSessionChange’ is triggered when the top session is changed.
callback	(session: AVSessionDescriptor) => void	Yes	Callback used to report the session descriptor.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.on('topSessionChange', (descriptor: avSession.AVSessionDescriptor) => {
  console.info(`on topSessionChange : isActive : ${descriptor.isActive}`);
  console.info(`on topSessionChange : type : ${descriptor.type}`);
  console.info(`on topSessionChange : sessionTag : ${descriptor.sessionTag}`);
});

avSession.off(‘sessionCreate’)

off(type: ‘sessionCreate’, callback?: (session: AVSessionDescriptor) => void): void

Unsubscribes from session creation events.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘sessionCreate’ in this case.
callback	(session: AVSessionDescriptor) => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The session parameter in the callback describes a media session. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.off('sessionCreate');

avSession.off(‘sessionDestroy’)

off(type: ‘sessionDestroy’, callback?: (session: AVSessionDescriptor) => void): void

Unsubscribes from session destruction events.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘sessionDestroy’ in this case.
callback	(session: AVSessionDescriptor) => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The session parameter in the callback describes a media session. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.off('sessionDestroy');

avSession.off(‘topSessionChange’)

off(type: ‘topSessionChange’, callback?: (session: AVSessionDescriptor) => void): void

Unsubscribes from top session change events.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘topSessionChange’ in this case.
callback	(session: AVSessionDescriptor) => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The session parameter in the callback describes a media session. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.off('topSessionChange');

avSession.on(‘sessionServiceDie’)

on(type: ‘sessionServiceDie’, callback: () => void): void

Subscribes to session service death events.

System capability: SystemCapability.Multimedia.AVSession.Core

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘sessionServiceDie’ is triggered when the session service dies.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.on('sessionServiceDie', () => {
  console.info(`on sessionServiceDie  : session is  Died `);
});

avSession.off(‘sessionServiceDie’)

off(type: ‘sessionServiceDie’, callback?: () => void): void

Unsubscribes from session service death events.

System capability: SystemCapability.Multimedia.AVSession.Core

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘sessionServiceDie’ is triggered when the session service dies.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

avSession.off('sessionServiceDie');

avSession.sendSystemAVKeyEvent

sendSystemAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void

Sends a system key event to the top session. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
event	KeyEvent	Yes	Key event.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the event is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600105	Invalid session command.

Example

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

let keyItem: keyEvent.Key = {code:0x49, pressedTime:2, deviceId:0};
let event: keyEvent.KeyEvent = {id:1, deviceId:0, actionTime:1, screenId:1, windowId:1, action:2, key:keyItem, unicodeChar:0, keys:[keyItem], ctrlKey:false, altKey:false, shiftKey:false, logoKey:false, fnKey:false, capsLock:false, numLock:false, scrollLock:false};

avSession.sendSystemAVKeyEvent(event, (err: BusinessError) => {
  if (err) {
    console.error(`SendSystemAVKeyEvent BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`SendSystemAVKeyEvent : SUCCESS `);
  }
});

avSession.sendSystemAVKeyEvent

sendSystemAVKeyEvent(event: KeyEvent): Promise<void>

Sends a system key event to the top session. This API uses a promise to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
event	KeyEvent	Yes	Key event.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the event is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600105	Invalid session command.

Example

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

let keyItem: keyEvent.Key = {code:0x49, pressedTime:2, deviceId:0};
let event: keyEvent.KeyEvent = {id:1, deviceId:0, actionTime:1, screenId:1, windowId:1, action:2, key:keyItem, unicodeChar:0, keys:[keyItem], ctrlKey:false, altKey:false, shiftKey:false, logoKey:false, fnKey:false, capsLock:false, numLock:false, scrollLock:false};

avSession.sendSystemAVKeyEvent(event).then(() => {
  console.info(`SendSystemAVKeyEvent Successfully`);
}).catch((err: BusinessError) => {
  console.error(`SendSystemAVKeyEvent BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.sendSystemControlCommand

sendSystemControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void

Sends a system control command to the top session. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
command	AVControlCommand	Yes	Command to send.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600105	Invalid session command.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';

let cmd : avSession.AVControlCommandType = 'play';
// let cmd : avSession.AVControlCommandType = 'pause';
// let cmd : avSession.AVControlCommandType = 'stop';
// let cmd : avSession.AVControlCommandType = 'playNext';
// let cmd : avSession.AVControlCommandType = 'playPrevious';
// let cmd : avSession.AVControlCommandType = 'fastForward';
// let cmd : avSession.AVControlCommandType = 'rewind';
let avcommand: avSession.AVControlCommand = {command:cmd};
// let cmd : avSession.AVControlCommandType = 'seek';
// let avcommand = {command:cmd, parameter:10};
// let cmd : avSession.AVControlCommandType = 'setSpeed';
// let avcommand = {command:cmd, parameter:2.6};
// let cmd : avSession.AVControlCommandType = 'setLoopMode';
// let avcommand = {command:cmd, parameter:avSession.LoopMode.LOOP_MODE_SINGLE};
// let cmd : avSession.AVControlCommandType = 'toggleFavorite';
// let avcommand = {command:cmd, parameter:"false"};
avSession.sendSystemControlCommand(avcommand, (err) => {
  if (err) {
    console.error(`SendSystemControlCommand BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`sendSystemControlCommand successfully`);
  }
});

avSession.sendSystemControlCommand

sendSystemControlCommand(command: AVControlCommand): Promise<void>

Sends a system control command to the top session. This API uses a promise to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
command	AVControlCommand	Yes	Command to send.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600105	Invalid session command.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let cmd : avSession.AVControlCommandType = 'play';
// let cmd : avSession.AVControlCommandType = 'pause';
// let cmd : avSession.AVControlCommandType = 'stop';
// let cmd : avSession.AVControlCommandType = 'playNext';
// let cmd : avSession.AVControlCommandType = 'playPrevious';
// let cmd : avSession.AVControlCommandType = 'fastForward';
// let cmd : avSession.AVControlCommandType = 'rewind';
let avcommand: avSession.AVControlCommand = {command:cmd};
// let cmd : avSession.AVControlCommandType = 'seek';
// let avcommand = {command:cmd, parameter:10};
// let cmd : avSession.AVControlCommandType = 'setSpeed';
// let avcommand = {command:cmd, parameter:2.6};
// let cmd : avSession.AVControlCommandType = 'setLoopMode';
// let avcommand = {command:cmd, parameter:avSession.LoopMode.LOOP_MODE_SINGLE};
// let cmd : avSession.AVControlCommandType = 'toggleFavorite';
// let avcommand = {command:cmd, parameter:"false"};
avSession.sendSystemControlCommand(avcommand).then(() => {
  console.info(`SendSystemControlCommand successfully`);
}).catch((err: BusinessError) => {
  console.error(`SendSystemControlCommand BusinessError: code: ${err.code}, message: ${err.message}`);
});

ProtocolType¹⁰⁺

Enumerates the protocol types supported by the remote device.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Name	Value	Description
TYPE_LOCAL	0	Local device.
TYPE_CAST_PLUS_MIRROR	1	Cast+ mirror mode.
TYPE_CAST_PLUS_STREAM	2	Cast+ stream mode.

avSession.startCastDeviceDiscovery¹⁰⁺

startCastDeviceDiscovery(callback: AsyncCallback<void>): void

Starts cast-enabled device discovery. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent and device discovery starts, err is undefined; otherwise, err is an error object.

Example

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

avSession.startCastDeviceDiscovery((err: BusinessError) => {
  if (err) {
    console.error(`startCastDeviceDiscovery BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`startCastDeviceDiscovery successfully`);
  }
});

avSession.startCastDeviceDiscovery¹⁰⁺

startCastDeviceDiscovery(filter: number, callback: AsyncCallback<void>): void

Starts cast-enabled device discovery with filter criteria specified. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
filter	number	Yes	Filter criteria for device discovery. The value consists of ProtocolTypes.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent and device discovery starts, err is undefined; otherwise, err is an error object.

Example

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

let filter = 2;
avSession.startCastDeviceDiscovery(filter, (err: BusinessError) => {
  if (err) {
    console.error(`startCastDeviceDiscovery BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`startCastDeviceDiscovery successfully`);
  }
});

avSession.startCastDeviceDiscovery¹⁰⁺

startCastDeviceDiscovery(filter?: number): Promise<void>

Starts cast-enabled device discovery. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
filter	number	No	Filter criteria for device discovery. The value consists of ProtocolTypes.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent and device discovery starts, no value is returned; otherwise, an error object is returned.

Example

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

let filter = 2;
avSession.startCastDeviceDiscovery(filter).then(() => {
  console.info(`startCastDeviceDiscovery successfully`);
}).catch((err: BusinessError) => {
  console.error(`startCastDeviceDiscovery BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.stopCastDeviceDiscovery¹⁰⁺

stopCastDeviceDiscovery(callback: AsyncCallback<void>): void

Stops cast-enabled device discovery. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If device discovery stops, err is undefined; otherwise, err is an error object.

Example

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

avSession.stopCastDeviceDiscovery((err: BusinessError) => {
  if (err) {
    console.error(`stopCastDeviceDiscovery BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`stopCastDeviceDiscovery successfully`);
  }
});

avSession.stopCastDeviceDiscovery¹⁰⁺

stopCastDeviceDiscovery(): Promise<void>

Stops cast-enabled device discovery. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Return value

Type	Description
Promise<void>	Promise used to return the result. If device discovery stops, no value is returned; otherwise, an error object is returned.

Example

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

avSession.stopCastDeviceDiscovery().then(() => {
  console.info(`startCastDeviceDiscovery successfully`);
}).catch((err: BusinessError) => {
  console.error(`startCastDeviceDiscovery BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.setDiscoverable¹⁰⁺

setDiscoverable(enable: boolean, callback: AsyncCallback<void>): void

Sets whether to allow the device discoverable. A discoverable device can be used as the cast receiver. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
enable	boolean	Yes	Whether to allow the device discoverable. The value true means to allow the device discoverable, and false means the opposite.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

Example

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

avSession.setDiscoverable(true, (err: BusinessError) => {
  if (err) {
    console.error(`setDiscoverable BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`setDiscoverable successfully`);
  }
});

avSession.setDiscoverable¹⁰⁺

setDiscoverable(enable: boolean): Promise<void>

Sets whether to allow the device discoverable. A discoverable device can be used as the cast receiver. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
enable	boolean	Yes	Whether to allow the device discoverable. The value true means to allow the device discoverable, and false means the opposite.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Example

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

avSession.setDiscoverable(true).then(() => {
  console.info(`setDiscoverable successfully`);
}).catch((err: BusinessError) => {
  console.error(`setDiscoverable BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.on(‘deviceAvailable’)¹⁰⁺

on(type: ‘deviceAvailable’, callback: (device: OutputDeviceInfo) => void): void

Subscribes to device discovery events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘deviceAvailable’ is triggered when a device is discovered.
callback	(device: OutputDeviceInfo) => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Example

import avSession from '@ohos.multimedia.avsession';

let castDevice: avSession.OutputDeviceInfo;
avSession.on('deviceAvailable', (device: avSession.OutputDeviceInfo) => {
  castDevice = device;
  console.info(`on deviceAvailable  : ${device} `);
});

avSession.off(‘deviceAvailable’)¹⁰⁺

off(type: ‘deviceAvailable’, callback?: (device: OutputDeviceInfo) => void): void

Unsubscribes from device discovery events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘deviceAvailable’ is triggered when a device is discovered.

Example

avSession.off('deviceAvailable');

avSession.getAVCastController¹⁰⁺

getAVCastController(sessionId: string, callback: AsyncCallback<AVCastController>): void

Obtains the cast controller when a casting connection is set up. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
sessionId	string	Yes	Session ID.
callback	AsyncCallback<AVCastController>	Yes	Callback used to return the cast controller.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception
6600102	session does not exist

Example

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

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let aVCastController: avSession.AVCastController;
avSession.getAVCastController(sessionId , (err: BusinessError, avcontroller: avSession.AVCastController) => {
  if (err) {
    console.error(`getAVCastController BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    aVCastController = avcontroller;
    console.info('getAVCastController : SUCCESS ');
  }
});

avSession.getAVCastController¹⁰⁺

getAVCastController(sessionId: string): Promise<AVCastController>;

Obtains the cast controller when a casting connection is set up. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
sessionId	string	Yes	Session ID.

Return value

Type	Description
Promise<AVCastController>	Promise used to return the cast controller.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	server exception
6600102	The session does not exist

Example

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

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let aVCastController: avSession.AVCastController;
avSession.getAVCastController(sessionId).then((avcontroller: avSession.AVCastController) => {
  aVCastController = avcontroller;
  console.info('getAVCastController : SUCCESS');
}).catch((err: BusinessError) => {
  console.error(`getAVCastController BusinessError: code: ${err.code}, message: ${err.message}`);
});

avSession.startCasting¹⁰⁺

startCasting(session: SessionToken, device: OutputDeviceInfo, callback: AsyncCallback<void>): void

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

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
session	SessionToken	Yes	Session token.
device	OutputDeviceInfo	Yes	Device-related information.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent and casting starts, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600108	Device connecting failed.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let myToken: avSession.SessionToken = {
  sessionId: sessionId,
}
let castDevice: avSession.OutputDeviceInfo|undefined = undefined;
avSession.on('deviceAvailable', (device: avSession.OutputDeviceInfo) => {
  castDevice = device;
  console.info(`on deviceAvailable  : ${device} `);
});
if (castDevice !== undefined) {
  avSession.startCasting(myToken, castDevice, (err: BusinessError) => {
    if (err) {
      console.error(`startCasting BusinessError: code: ${err.code}, message: ${err.message}`);
    } else {
      console.info(`startCasting successfully`);
    }
  });
}

avSession.startCasting¹⁰⁺

startCasting(session: SessionToken, device: OutputDeviceInfo): Promise<void>

Starts casting. This API uses a promise to return the result.

Required permissions: ohos.permission.MANAGE_MEDIA_RESOURCES (available only to system applications)

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
session	SessionToken	Yes	Session token.
device	OutputDeviceInfo	Yes	Device-related information.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent and casting starts, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600108	Device connecting failed.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let myToken: avSession.SessionToken = {
  sessionId: sessionId,
}
let castDevice: avSession.OutputDeviceInfo|undefined = undefined;
avSession.on('deviceAvailable', (device: avSession.OutputDeviceInfo) => {
  castDevice = device;
  console.info(`on deviceAvailable  : ${device} `);
});
if (castDevice !== undefined) {
  avSession.startCasting(myToken, castDevice).then(() => {
    console.info(`startCasting successfully`);
  }).catch((err: BusinessError) => {
    console.error(`startCasting BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

avSession.stopCasting¹⁰⁺

stopCasting(session: SessionToken, callback: AsyncCallback<void>): void

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

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
session	SessionToken	Yes	Session token.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If casting stops, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let myToken: avSession.SessionToken = {
  sessionId: sessionId,
}
avSession.stopCasting(myToken, (err: BusinessError) => {
  if (err) {
    console.error(`stopCasting BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`stopCasting successfully`);
  }
});

avSession.stopCasting¹⁰⁺

stopCasting(session: SessionToken): Promise<void>

Stops castings. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
session	SessionToken	Yes	Session token.

Return value

Type	Description
Promise<void>	Promise used to return the result. If casting stops, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";  // Used as an input parameter of subsequent functions.

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
    if (currentAVSession !== undefined) {
      sessionId = currentAVSession.sessionId;
    }
    console.info(`CreateAVSession : SUCCESS : sessionId = ${sessionId}`);
  }
});

let myToken: avSession.SessionToken = {
  sessionId: sessionId,
}
avSession.stopCasting(myToken).then(() => {
  console.info(`stopCasting successfully`);
}).catch((err: BusinessError) => {
  console.error(`stopCasting BusinessError: code: ${err.code}, message: ${err.message}`);
});

AVSessionType¹⁰⁺

Enumerates the session types supported by the session.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Description
audio	string	Audio session.
video	string	Video session.

AVSession¹⁰⁺

An AVSession object is created by calling avSession.createAVSession. The object enables you to obtain the session ID and set the metadata and playback state.

Attributes

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Readable	Writable	Description
sessionId	string	Yes	No	Unique session ID of the AVSession object.
sessionType10+	AVSessionType	Yes	No	AVSession type.

Example

import avSession from '@ohos.multimedia.avsession';

let sessionId: string = currentAVSession.sessionId;
let sessionType: avSession.AVSessionType = currentAVSession.sessionType;

setAVMetadata¹⁰⁺

setAVMetadata(data: AVMetadata): Promise<void>

Sets session metadata. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
data	AVMetadata	Yes	Session metadata.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let metadata: avSession.AVMetadata = {
  assetId: "121278",
  title: "lose yourself",
  artist: "Eminem",
  author: "ST",
  album: "Slim shady",
  writer: "ST",
  composer: "ST",
  duration: 2222,
  mediaImage: "https://www.example.com/example.jpg",
  subtitle: "8 Mile",
  description: "Rap",
  lyric: "https://www.example.com/example.lrc",
  previousAssetId: "121277",
  nextAssetId: "121279",
};
currentAVSession.setAVMetadata(metadata).then(() => {
  console.info(`SetAVMetadata successfully`);
}).catch((err: BusinessError) => {
  console.error(`SetAVMetadata BusinessError: code: ${err.code}, message: ${err.message}`);
});

setAVMetadata¹⁰⁺

setAVMetadata(data: AVMetadata, callback: AsyncCallback<void>): void

Sets session metadata. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
data	AVMetadata	Yes	Session metadata.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let metadata: avSession.AVMetadata = {
  assetId: "121278",
  title: "lose yourself",
  artist: "Eminem",
  author: "ST",
  album: "Slim shady",
  writer: "ST",
  composer: "ST",
  duration: 2222,
  mediaImage: "https://www.example.com/example.jpg",
  subtitle: "8 Mile",
  description: "Rap",
  lyric: "https://www.example.com/example.lrc",
  previousAssetId: "121277",
  nextAssetId: "121279",
};
currentAVSession.setAVMetadata(metadata, (err: BusinessError) => {
  if (err) {
    console.error(`SetAVMetadata BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`SetAVMetadata successfully`);
  }
});

setAVPlaybackState¹⁰⁺

setAVPlaybackState(state: AVPlaybackState): Promise<void>

Sets information related to the session playback state. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
data	AVPlaybackState	Yes	Information related to the session playback state.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let playbackState: avSession.AVPlaybackState = {
  state:avSession.PlaybackState.PLAYBACK_STATE_PLAY,
  speed: 1.0,
  position:{elapsedTime:10, updateTime:(new Date()).getTime()},
  bufferedTime:1000,
  loopMode:avSession.LoopMode.LOOP_MODE_SINGLE,
  isFavorite:true,
};
currentAVSession.setAVPlaybackState(playbackState).then(() => {
  console.info(`SetAVPlaybackState successfully`);
}).catch((err: BusinessError) => {
  console.info(`SetAVPlaybackState BusinessError: code: ${err.code}, message: ${err.message}`);
});

setAVPlaybackState¹⁰⁺

setAVPlaybackState(state: AVPlaybackState, callback: AsyncCallback<void>): void

Sets information related to the session playback state. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
data	AVPlaybackState	Yes	Information related to the session playback state.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let PlaybackState: avSession.AVPlaybackState = {
  state:avSession.PlaybackState.PLAYBACK_STATE_PLAY,
  speed: 1.0,
  position:{elapsedTime:10, updateTime:(new Date()).getTime()},
  bufferedTime:1000,
  loopMode:avSession.LoopMode.LOOP_MODE_SINGLE,
  isFavorite:true,
};
currentAVSession.setAVPlaybackState(PlaybackState, (err: BusinessError) => {
  if (err) {
    console.info(`SetAVPlaybackState BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`SetAVPlaybackState successfully`);
  }
});

setLaunchAbility¹⁰⁺

setLaunchAbility(ability: WantAgent): Promise<void>

Sets a launcher ability. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
ability	WantAgent	Yes	Application attributes, such as the bundle name, ability name, and deviceID.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

// WantAgentInfo object
let wantAgentInfo: wantAgent.WantAgentInfo = {
  wants: [
    {
      deviceId: "deviceId",
      bundleName: "com.example.myapplication",
      abilityName: "EntryAbility",
      action: "action1",
      entities: ["entity1"],
      type: "MIMETYPE",
      uri: "key={true,true,false}",
      parameters:
        {
          mykey0: 2222,
          mykey1: [1, 2, 3],
          mykey2: "[1, 2, 3]",
          mykey3: "ssssssssssssssssssssssssss",
          mykey4: [false, true, false],
          mykey5: ["qqqqq", "wwwwww", "aaaaaaaaaaaaaaaaa"],
          mykey6: true,
        }
    }
  ],
  operationType: wantAgent.OperationType.START_ABILITIES,
  requestCode: 0,
  wantAgentFlags:[wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG]
}

wantAgent.getWantAgent(wantAgentInfo).then((agent) => {
  currentAVSession.setLaunchAbility(agent).then(() => {
    console.info(`SetLaunchAbility successfully`);
  }).catch((err: BusinessError) => {
    console.error(`SetLaunchAbility BusinessError: code: ${err.code}, message: ${err.message}`);
  });
});

setLaunchAbility¹⁰⁺

setLaunchAbility(ability: WantAgent, callback: AsyncCallback<void>): void

Sets a launcher ability. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
ability	WantAgent	Yes	Application attributes, such as the bundle name, ability name, and deviceID.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

// WantAgentInfo object
let wantAgentInfo: wantAgent.WantAgentInfo = {
  wants: [
    {
      deviceId: "deviceId",
      bundleName: "com.example.myapplication",
      abilityName: "EntryAbility",
      action: "action1",
      entities: ["entity1"],
      type: "MIMETYPE",
      uri: "key={true,true,false}",
      parameters:
        {
          mykey0: 2222,
          mykey1: [1, 2, 3],
          mykey2: "[1, 2, 3]",
          mykey3: "ssssssssssssssssssssssssss",
          mykey4: [false, true, false],
          mykey5: ["qqqqq", "wwwwww", "aaaaaaaaaaaaaaaaa"],
          mykey6: true,
        }
    }
  ],
  operationType: wantAgent.OperationType.START_ABILITIES,
  requestCode: 0,
  wantAgentFlags:[wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG]
}

wantAgent.getWantAgent(wantAgentInfo).then((agent) => {
  currentAVSession.setLaunchAbility(agent, (err: BusinessError) => {
    if (err) {
      console.error(`SetLaunchAbility BusinessError: code: ${err.code}, message: ${err.message}`);
    } else {
      console.info(`SetLaunchAbility successfully`);
    }
  });
});

dispatchSessionEvent¹⁰⁺

dispatchSessionEvent(event: string, args: {[key: string]: Object}): Promise<void>

Dispatches a custom event in the session, including the event name and event content in key-value pair format. This API uses a promise to return the result. It is called by the provider.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Name of the session event.
args	{[key: string]: any}	Yes	Event content in key-value pair format.

NOTE

The args parameter supports the following data types: string, number, Boolean, object, array, and file descriptor. For details, see @ohos.app.ability.Want (Want).

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
let eventName = "dynamic_lyric";
if (currentAVSession !== undefined) {
  (currentAVSession as avSession.AVSession).dispatchSessionEvent(eventName, {lyric : "This is lyric"}).then(() => {
    console.info(`dispatchSessionEvent successfully`);
  }).catch((err: BusinessError) => {
    console.info(`dispatchSessionEvent BusinessError: code: ${err.code}, message: ${err.message}`);
  })
}

dispatchSessionEvent¹⁰⁺

dispatchSessionEvent(event: string, args: {[key: string]: Object}, callback: AsyncCallback<void>): void

Dispatches a custom event in the session, including the event name and event content in key-value pair format. This API uses an asynchronous callback to return the result. It is called by the provider.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Name of the session event.
args	{[key: string]: any}	Yes	Event content in key-value pair format.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

NOTE

The args parameter supports the following data types: string, number, Boolean, object, array, and file descriptor. For details, see @ohos.app.ability.Want (Want).

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
let eventName: string = "dynamic_lyric";
if (currentAVSession !== undefined) {
  (currentAVSession as avSession.AVSession).dispatchSessionEvent(eventName, {lyric : "This is lyric"}, (err: BusinessError) => {
    if(err) {
      console.error(`dispatchSessionEvent BusinessError: code: ${err.code}, message: ${err.message}`);
    }
  })
}

setAVQueueItems¹⁰⁺

setAVQueueItems(items: Array<AVQueueItem>): Promise<void>

Sets a playlist. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
items	Array<AVQueueItem>	Yes	Playlist to set.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import image from '@ohos.multimedia.image';
import resourceManager from '@ohos.resourceManager';
import { BusinessError } from '@ohos.base';
import avSession from '@ohos.multimedia.avsession';

let value: Uint8Array|undefined = undefined;
let imageSource: image.ImageSource|undefined = undefined;
resourceManager.getSystemResourceManager().getRawFileContent('IMAGE_URI').then((data) => {
  value = data;
});
if (value !== undefined) {
  imageSource = image.createImageSource((value as Uint8Array).buffer);
}
let imagePixel: image.PixelMap|undefined = undefined;
if (imageSource !== undefined) {
  (imageSource as image.ImageSource).createPixelMap({desiredSize:{width: 150, height: 150}}).then((data) => {
    imagePixel = data;
  }).catch((err: BusinessError) => {
    console.error(`createPixelMap BusinessError: code: ${err.code}, message: ${err.message}`);
  })
}

let queueItemDescription_1: avSession.AVMediaDescription = {
  assetId: '001',
  title: 'music_name',
  subtitle: 'music_sub_name',
  description: 'music_description',
  mediaImage : imagePixel,
  extras: {extras:'any'}
};
let queueItem_1: avSession.AVQueueItem = {
  itemId: 1,
  description: queueItemDescription_1
};
let queueItemDescription_2: avSession.AVMediaDescription = {
  assetId: '002',
  title: 'music_name',
  subtitle: 'music_sub_name',
  description: 'music_description',
  mediaImage: imagePixel,
  extras: {extras:'any'}
};
let queueItem_2: avSession.AVQueueItem = {
  itemId: 2,
  description: queueItemDescription_2
};
let queueItemsArray: avSession.AVQueueItem[] = [queueItem_1, queueItem_2];
currentAVSession.setAVQueueItems(queueItemsArray).then(() => {
  console.info(`SetAVQueueItems successfully`);
}).catch((err: BusinessError) => {
  console.error(`SetAVQueueItems BusinessError: code: ${err.code}, message: ${err.message}`);
});

setAVQueueItems¹⁰⁺

setAVQueueItems(items: Array<AVQueueItem>, callback: AsyncCallback<void>): void

Sets a playlist. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
items	Array<AVQueueItem>	Yes	Playlist to set.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import image from '@ohos.multimedia.image';
import resourceManager from '@ohos.resourceManager';
import { BusinessError } from '@ohos.base';
import avSession from '@ohos.multimedia.avsession';

let value: Uint8Array|undefined = undefined;
let imageSource: image.ImageSource|undefined = undefined;
resourceManager.getSystemResourceManager().getRawFileContent('IMAGE_URI').then((data) => {
  value = data;
});
if (value !== undefined) {
  imageSource = image.createImageSource((value as Uint8Array).buffer);
}
let imagePixel: image.PixelMap|undefined = undefined;
if (imageSource !== undefined) {
  (imageSource as image.ImageSource).createPixelMap({desiredSize:{width: 150, height: 150}}).then((data) => {
    imagePixel = data;
  }).catch((err: BusinessError) => {
    console.error(`createPixelMap BusinessError: code: ${err.code}, message: ${err.message}`);
  })
}
let queueItemDescription_1: avSession.AVMediaDescription = {
  assetId: '001',
  title: 'music_name',
  subtitle: 'music_sub_name',
  description: 'music_description',
  mediaImage : imagePixel,
  extras: {extras:'any'}
};
let queueItem_1: avSession.AVQueueItem = {
  itemId: 1,
  description: queueItemDescription_1
};
let queueItemDescription_2: avSession.AVMediaDescription = {
  assetId: '002',
  title: 'music_name',
  subtitle: 'music_sub_name',
  description: 'music_description',
  mediaImage: imagePixel,
  extras: {extras:'any'}
};
let queueItem_2: avSession.AVQueueItem = {
  itemId: 2,
  description: queueItemDescription_2
};
let queueItemsArray: avSession.AVQueueItem[] = [queueItem_1, queueItem_2];
currentAVSession.setAVQueueItems(queueItemsArray, (err: BusinessError) => {
  if (err) {
    console.error(`SetAVQueueItems BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`SetAVQueueItems successfully`);
  }
});

setAVQueueTitle¹⁰⁺

setAVQueueTitle(title: string): Promise<void>

Sets a name for the playlist. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
title	string	Yes	Name of the playlist.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

let queueTitle = 'QUEUE_TITLE';
currentAVSession.setAVQueueTitle(queueTitle).then(() => {
  console.info(`SetAVQueueTitle successfully`);
}).catch((err: BusinessError) => {
  console.error(`SetAVQueueTitle BusinessError: code: ${err.code}, message: ${err.message}`);
});

setAVQueueTitle¹⁰⁺

setAVQueueTitle(title: string, callback: AsyncCallback<void>): void

Sets a name for the playlist. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
title	string	Yes	Name of the playlist.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

let queueTitle = 'QUEUE_TITLE';
currentAVSession.setAVQueueTitle(queueTitle, (err: BusinessError) => {
  if (err) {
    console.info(`SetAVQueueTitle BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.error(`SetAVQueueTitle successfully`);
  }
});

setExtras¹⁰⁺

setExtras(extras: {[key: string]: Object}): Promise<void>

Sets a custom media packet in the form of key-value pairs. This API uses a promise to return the result. It is called by the provider.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
extras	{[key: string]: Object}	Yes	Key-value pairs of the custom media packet.

NOTE

The extras parameter supports the following data types: string, number, Boolean, object, array, and file descriptor. For details, see @ohos.app.ability.Want (Want).

Return value

Type	Description
Promise<void>	Promise used to return the result. If the setting is successful, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  (currentAVSession as avSession.AVSession).setExtras({extras : "This is custom media packet"}).then(() => {
    console.info(`setExtras successfully`);
  }).catch((err: BusinessError) => {
    console.info(`setExtras BusinessError: code: ${err.code}, message: ${err.message}`);
  })
}

setExtras¹⁰⁺

setExtras(extras: {[key: string]: Object}, callback: AsyncCallback<void>): void

Sets a custom media packet in the form of key-value pairs. This API uses an asynchronous callback to return the result. It is called by the provider.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
extras	{[key: string]: any}	Yes	Key-value pairs of the custom media packet.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

NOTE

The extras parameter supports the following data types: string, number, Boolean, object, array, and file descriptor. For details, see @ohos.app.ability.Want (Want).

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  (currentAVSession as avSession.AVSession).setExtras({extras : "This is custom media packet"}, (err: BusinessError) => {
    if(err) {
      console.error(`setExtras BusinessError: code: ${err.code}, message: ${err.message}`);
    }
  })
}

getController¹⁰⁺

getController(): Promise<AVSessionController>

Obtains the controller corresponding to this session. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<AVSessionController>	Promise used to return the session controller.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

let avsessionController: avSession.AVSessionController;
currentAVSession.getController().then((avcontroller: avSession.AVSessionController) => {
  avsessionController = avcontroller;
  console.info(`GetController : SUCCESS : sessionid : ${avsessionController.sessionId}`);
}).catch((err: BusinessError) => {
  console.error(`GetController BusinessError: code: ${err.code}, message: ${err.message}`);
});

getController¹⁰⁺

getController(callback: AsyncCallback<AVSessionController>): void

Obtains the controller corresponding to this session. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<AVSessionController>	Yes	Callback used to return the session controller.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

let avsessionController: avSession.AVSessionController;
currentAVSession.getController((err: BusinessError, avcontroller: avSession.AVSessionController) => {
  if (err) {
    console.error(`GetController BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    avsessionController = avcontroller;
    console.info(`GetController : SUCCESS : sessionid : ${avsessionController.sessionId}`);
  }
});

getAVCastController¹⁰⁺

getAVCastController(callback: AsyncCallback<AVCastController>): void

Obtains the cast controller when a casting connection is set up. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<AVCastController>	Yes	Callback used to return the cast controller.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600102	The session does not exist.
6600110	The remote connection does not exist.

Example

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

let aVCastController: avSession.AVCastController;
currentAVSession.getAVCastController().then((avcontroller: avSession.AVCastController) => {
  aVCastController = avcontroller;
  console.info(`getAVCastController : SUCCESS : sessionid : ${aVCastController.sessionId}`);
}).catch((err: BusinessError) => {
  console.error(`getAVCastController BusinessError: code: ${err.code}, message: ${err.message}`);
});

getAVCastController¹⁰⁺

getAVCastController(): Promise<AVCastController>;

Obtains the cast controller when a casting connection is set up. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Return value

Type	Description
Promise<AVCastController>	Promise used to return the cast controller.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600102	The session does not exist.
6600110	The remote connection does not exist.

Example

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

let aVCastController: avSession.AVCastController;
currentAVSession.getAVCastController((err: BusinessError, avcontroller: avSession.AVCastController) => {
  if (err) {
    console.error(`getAVCastController BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    aVCastController = avcontroller;
    console.info(`getAVCastController : SUCCESS : sessionid : ${aVCastController.sessionId}`);
  }
});

getOutputDevice¹⁰⁺

getOutputDevice(): Promise<OutputDeviceInfo>

Obtains information about the output device for this session. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<OutputDeviceInfo>	Promise used to return the output device information.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.getOutputDevice().then((outputDeviceInfo: avSession.OutputDeviceInfo) => {
  console.info(`GetOutputDevice : SUCCESS : isRemote : ${outputDeviceInfo.isRemote}`);
}).catch((err: BusinessError) => {
  console.error(`GetOutputDevice BusinessError: code: ${err.code}, message: ${err.message}`);
})

getOutputDevice¹⁰⁺

getOutputDevice(callback: AsyncCallback<OutputDeviceInfo>): void

Obtains information about the output device for this session. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<OutputDeviceInfo>	Yes	Callback used to return the information obtained.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.getOutputDevice((err: BusinessError, outputDeviceInfo: avSession.OutputDeviceInfo) => {
  if (err) {
    console.error(`GetOutputDevice BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetOutputDevice : SUCCESS : isRemote : ${outputDeviceInfo.isRemote}`);
  }
});

activate¹⁰⁺

activate(): Promise<void>

Activates this session. A session can be used only after being activated. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the session is activated, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.activate().then(() => {
  console.info(`Activate : SUCCESS `);
}).catch((err: BusinessError) => {
  console.error(`Activate BusinessError: code: ${err.code}, message: ${err.message}`);
});

activate¹⁰⁺

activate(callback: AsyncCallback<void>): void

Activates this session. A session can be used only after being activated. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the session is activated, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.activate((err: BusinessError) => {
  if (err) {
    console.error(`Activate BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`Activate : SUCCESS `);
  }
});

deactivate¹⁰⁺

deactivate(): Promise<void>

Deactivates this session. You can use activate to activate the session again. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the session is deactivated, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.deactivate().then(() => {
  console.info(`Deactivate : SUCCESS `);
}).catch((err: BusinessError) => {
  console.error(`Deactivate BusinessError: code: ${err.code}, message: ${err.message}`);
});

deactivate¹⁰⁺

deactivate(callback: AsyncCallback<void>): void

Deactivates this session. This API uses an asynchronous callback to return the result.

Deactivates this session. You can use activate to activate the session again.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the session is deactivated, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.deactivate((err: BusinessError) => {
  if (err) {
    console.error(`Deactivate BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`Deactivate : SUCCESS `);
  }
});

destroy¹⁰⁺

destroy(): Promise<void>

Destroys this session. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the session is destroyed, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.destroy().then(() => {
  console.info(`Destroy : SUCCESS `);
}).catch((err: BusinessError) => {
  console.error(`Destroy BusinessError: code: ${err.code}, message: ${err.message}`);
});

destroy¹⁰⁺

destroy(callback: AsyncCallback<void>): void

Destroys this session. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the session is destroyed, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

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

currentAVSession.destroy((err: BusinessError) => {
  if (err) {
    console.error(`Destroy BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`Destroy : SUCCESS `);
  }
});

on(‘play’)¹⁰⁺

on(type: ‘play’, callback: () => void): void

Subscribes to playback started events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘play’ is triggered when the command for starting playback is sent to the session.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('play', () => {
  console.info(`on play entry`);
});

on(‘pause’)¹⁰⁺

on(type: ‘pause’, callback: () => void): void

Subscribes to playback paused events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘pause’ is triggered when the command for pausing the playback is sent to the session.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('pause', () => {
  console.info(`on pause entry`);
});

on(‘stop’)¹⁰⁺

on(type:‘stop’, callback: () => void): void

Subscribes to playback stopped events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘stop’ is triggered when the command for stopping the playback is sent to the session.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('stop', () => {
  console.info(`on stop entry`);
});

on(‘playNext’)¹⁰⁺

on(type:‘playNext’, callback: () => void): void

Subscribes to playNext command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘playNext’ is triggered when the command for playing the next item is sent to the session.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('playNext', () => {
  console.info(`on playNext entry`);
});

on(‘playPrevious’)¹⁰⁺

on(type:‘playPrevious’, callback: () => void): void

Subscribes to playPrevious command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘playPrevious’ is triggered when the command for playing the previous item sent to the session.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('playPrevious', () => {
  console.info(`on playPrevious entry`);
});

on(‘fastForward’)¹⁰⁺

on(type: ‘fastForward’, callback: () => void): void

Subscribes to fastForward command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘fastForward’ is triggered when the command for fast forwarding is sent to the session.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('fastForward', () => {
  console.info(`on fastForward entry`);
});

on(‘rewind’)¹⁰⁺

on(type:‘rewind’, callback: () => void): void

Subscribes to rewind command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘rewind’ is triggered when the command for rewinding is sent to the session.
callback	callback: () => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('rewind', () => {
  console.info(`on rewind entry`);
});

on(‘seek’)¹⁰⁺

on(type: ‘seek’, callback: (time: number) => void): void

Subscribes to seek command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘seek’ is triggered when the seek command is sent to the session.
callback	(time: number) => void	Yes	Callback used for subscription. The time parameter in the callback indicates the time to seek to, in milliseconds.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('seek', (time: number) => {
  console.info(`on seek entry time : ${time}`);
});

on(‘setSpeed’)¹⁰⁺

on(type: ‘setSpeed’, callback: (speed: number) => void): void

Subscribes to setSpeed command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘setSpeed’ is triggered when the command for setting the playback speed is sent to the session.
callback	(speed: number) => void	Yes	Callback used for subscription. The speed parameter in the callback indicates the playback speed.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('setSpeed', (speed: number) => {
  console.info(`on setSpeed speed : ${speed}`);
});

on(‘setLoopMode’)¹⁰⁺

on(type: ‘setLoopMode’, callback: (mode: LoopMode) => void): void

Subscribes to setLoopMode command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘setLoopMode’ is triggered when the command for setting the loop mode is sent to the session.
callback	(mode: LoopMode) => void	Yes	Callback used for subscription. The mode parameter in the callback indicates the loop mode.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('setLoopMode', (mode: avSession.LoopMode) => {
  console.info(`on setLoopMode mode : ${mode}`);
});

on(‘toggleFavorite’)¹⁰⁺

on(type: ‘toggleFavorite’, callback: (assetId: string) => void): void

Subscribes to toggleFavorite command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘toggleFavorite’ is triggered when the command for favoriting the media asset is sent to the session.
callback	(assetId: string) => void	Yes	Callback used for subscription. The assetId parameter in the callback indicates the media asset ID.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('toggleFavorite', (assetId: string) => {
  console.info(`on toggleFavorite mode : ${assetId}`);
});

on(‘skipToQueueItem’)¹⁰⁺

on(type: ‘skipToQueueItem’, callback: (itemId: number) => void): void

Subscribes to the event that indicates an item in the playlist is selected. The session can play the selected item.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘skipToQueueItem’ is triggered when an item in the playlist is selected.
callback	(itemId: number) => void	Yes	Callback used for subscription. The itemId parameter in the callback indicates the ID of the selected item.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('skipToQueueItem', (itemId: number) => {
  console.info(`on skipToQueueItem id : ${itemId}`);
});

on(‘handleKeyEvent’)¹⁰⁺

on(type: ‘handleKeyEvent’, callback: (event: KeyEvent) => void): void

Subscribes to key events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘handleKeyEvent’ is triggered when a key event is sent to the session.
callback	(event: KeyEvent) => void	Yes	Callback used for subscription. The event parameter in the callback indicates the key event.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import keyEvent from '@ohos.multimodalInput.keyEvent';

currentAVSession.on('handleKeyEvent', (event: keyEvent.KeyEvent) => {
  console.info(`on handleKeyEvent event : ${event}`);
});

on(‘outputDeviceChange’)¹⁰⁺

on(type: ‘outputDeviceChange’, callback: (state: ConnectionState, device: OutputDeviceInfo) => void): void

Subscribes to output device change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘outputDeviceChange’ is triggered when the output device changes.
callback	(state: ConnectionState, device: OutputDeviceInfo) => void	Yes	Callback used for subscription. The device parameter in the callback indicates the output device information. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.on('outputDeviceChange', (state: avSession.ConnectionState, device: avSession.OutputDeviceInfo) => {
  console.info(`on outputDeviceChange device : ${device}`);
});

on(‘commonCommand’)¹⁰⁺

on(type: ‘commonCommand’, callback: (command: string, args: {[key: string]: Object}) => void): void

Subscribes to custom control command change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘commonCommand’ is triggered when a custom control command changes.
callback	(commonCommand: string, args: {[key:string]: Object}) => void	Yes	Callback used for subscription. The commonCommand parameter in the callback indicates the name of the changed custom control command, and args indicates the parameters carried in the command. The parameters must be the same as those set in sendCommand.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

import { BusinessError } from '@ohos.base';
import avSession from '@ohos.multimedia.avsession';
let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  (currentAVSession as avSession.AVSession).on('commonCommand', (commonCommand, args) => {
    console.info(`OnCommonCommand, the command is ${commonCommand}, args: ${JSON.stringify(args)}`);
  });
}

off(‘play’)¹⁰⁺

off(type: ‘play’, callback?: () => void): void

Unsubscribes from playback started events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘play’ in this case.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('play');

off(‘pause’)¹⁰⁺

off(type: ‘pause’, callback?: () => void): void

Unsubscribes from playback paused events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘pause’ in this case.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('pause');

off(‘stop’)¹⁰⁺

off(type: ‘stop’, callback?: () => void): void

Unsubscribes from playback stopped events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘stop’ in this case.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('stop');

off(‘playNext’)¹⁰⁺

off(type: ‘playNext’, callback?: () => void): void

Unsubscribes from playNext command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘playNext’ in this case.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('playNext');

off(‘playPrevious’)¹⁰⁺

off(type: ‘playPrevious’, callback?: () => void): void

Unsubscribes from playPrevious command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘playPrevious’ in this case.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('playPrevious');

off(‘fastForward’)¹⁰⁺

off(type: ‘fastForward’, callback?: () => void): void

Unsubscribes from fastForward command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘fastForward’ in this case.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('fastForward');

off(‘rewind’)¹⁰⁺

off(type: ‘rewind’, callback?: () => void): void

Unsubscribes from rewind command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘rewind’ in this case.
callback	callback: () => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('rewind');

off(‘seek’)¹⁰⁺

off(type: ‘seek’, callback?: (time: number) => void): void

Unsubscribes from seek command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘seek’ in this case.
callback	(time: number) => void	No	Callback used for unsubscription. The time parameter in the callback indicates the time to seek to, in milliseconds. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('seek');

off(‘setSpeed’)¹⁰⁺

off(type: ‘setSpeed’, callback?: (speed: number) => void): void

Unsubscribes from setSpeed command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘setSpeed’ in this case.
callback	(speed: number) => void	No	Callback used for unsubscription. The speed parameter in the callback indicates the playback speed. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('setSpeed');

off(‘setLoopMode’)¹⁰⁺

off(type: ‘setLoopMode’, callback?: (mode: LoopMode) => void): void

Unsubscribes from setSpeed command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘setLoopMode’ in this case.
callback	(mode: LoopMode) => void	No	Callback used for unsubscription. The mode parameter in the callback indicates the loop mode. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('setLoopMode');

off(‘toggleFavorite’)¹⁰⁺

off(type: ‘toggleFavorite’, callback?: (assetId: string) => void): void

Unsubscribes from toggleFavorite command events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘toggleFavorite’ in this case.
callback	(assetId: string) => void	No	Callback used for unsubscription. The assetId parameter in the callback indicates the media asset ID. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('toggleFavorite');

off(‘skipToQueueItem’)¹⁰⁺

off(type: ‘skipToQueueItem’, callback?: (itemId: number) => void): void

Unsubscribes from the event that indicates an item in the playlist is selected.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘skipToQueueItem’ in this case.
callback	(itemId: number) => void	No	Callback used for unsubscription. The itemId parameter in the callback indicates the ID of the item. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('skipToQueueItem');

off(‘handleKeyEvent’)¹⁰⁺

off(type: ‘handleKeyEvent’, callback?: (event: KeyEvent) => void): void

Unsubscribes from key events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘handleKeyEvent’ in this case.
callback	(event: KeyEvent) => void	No	Callback used for unsubscription. The event parameter in the callback indicates the key event. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('handleKeyEvent');

off(‘outputDeviceChange’)¹⁰⁺

off(type: ‘outputDeviceChange’, callback?: (state: ConnectionState, device: OutputDeviceInfo) => void): void

Unsubscribes from playback device change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘outputDeviceChange’ in this case.
callback	(state: ConnectionState, device: OutputDeviceInfo) => void	No	Callback used for unsubscription. The device parameter in the callback indicates the output device information. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('outputDeviceChange');

off(‘commonCommand’)¹⁰⁺

off(type: ‘commonCommand’, callback?: (command: string, args: {[key:string]: Object}) => void): void

Unsubscribes from custom control command change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘commonCommand’ in this case.
callback	(command: string, args: {[key:string]: Object}) => void	No	Callback used for unsubscription. The command parameter in the callback indicates the name of the changed custom control command, and args indicates the parameters carried in the command. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.

Example

currentAVSession.off('commonCommand');

stopCasting¹⁰⁺

stopCasting(callback: AsyncCallback<void>): void

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

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600109	The remote connection is not established.

Example

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

currentAVSession.stopCasting((err: BusinessError) => {
  if (err) {
    console.info(`stopCasting BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`stopCasting successfully`);
  }
});

stopCasting¹⁰⁺

stopCasting(): Promise<void>

Stops castings. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Return value

Type	Description
Promise<void>	Promise used to return the result. If casting stops, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600109	The remote connection is not established.

Example

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

currentAVSession.stopCasting().then(() => {
  console.info(`stopCasting successfully`);
}).catch((err: BusinessError) => {
  console.info(`stopCasting BusinessError: code: ${err.code}, message: ${err.message}`);
});

getOutputDeviceSync¹⁰⁺

getOutputDeviceSync(): OutputDeviceInfo

Obtains the output device information. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
OutputDeviceInfo	Information about the output device.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

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

try {
  let currentOutputDevice: avSession.OutputDeviceInfo = currentAVSession.getOutputDeviceSync();
} catch (err: BusinessError) {
  console.info(`getOutputDeviceSync error, error code: ${err.code}, error message: ${err.message}`);
}

AVCastControlCommandType¹⁰⁺

Enumerates the commands that can be sent by a cast controller.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Name	Type	Description
play	string	Play the media.
pause	string	Pause the playback.
stop	string	Stop the playback.
playNext	string	Play the next media asset.
playPrevious	string	Play the previous media asset.
fastForward	string	Fast-forward.
rewind	string	Rewind.
seek	numbder	Seek to a playback position.
setSpeed	number	Set the playback speed.
setLoopMode	string	Set the loop mode.
toggleFavorite	string	Favorite the media asset.
setVolume	number	Set the volume.

AVCastControlCommand¹⁰⁺

Defines the command that can be sent by a cast controller.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Name	Type	Mandatory	Description
command	AVCastControlCommandType	Yes	Command.
parameter	LoopMode | string | number	No	Parameters carried in the command.

AVCastController¹⁰⁺

After a casting connection is set up, you can call avSession.getAVCastController to obtain the cast controller. Through the controller, you can query the session ID, send commands and events to a session, and obtain session metadata and playback state information.

setDisplaySurface¹⁰⁺

setDisplaySurface(surfaceId: string): Promise<void>

Sets the surface ID for playback, which is used at the cast receiver (sink). This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Return value

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

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600109	The remote connection is not established.

Example

aVCastController.setDisplaySurface().then(() => {
  console.info(`setDisplaySurface : SUCCESS`);
});

setDisplaySurface¹⁰⁺

setDisplaySurface(surfaceId: string, callback: AsyncCallback<void>): void

Sets the surface ID for playback, which is used at the cast receiver (sink). This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

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

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600109	The remote connection is not established.

Example

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

aVCastController.setDisplaySurface((err: BusinessError) => {
  if (err) {
    console.info(`setDisplaySurface BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`setDisplaySurface : SUCCESS`);
  }
});

getAVPlaybackState¹⁰⁺

getAVPlaybackState(callback: AsyncCallback<AVPlaybackState>): void

Obtains the remote playback state. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<[AVPlaybackState>	Yes	Callback used to return the remote playback state.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception

Example

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

aVCastController.getAVPlaybackState((err: BusinessError, state: avSession.AVPlaybackState) => {
  if (err) {
    console.error(`getAVPlaybackState BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`getAVPlaybackState : SUCCESS`);
  }
});

getAVPlaybackState¹⁰⁺

getAVPlaybackState(): Promise<AVPlaybackState>;

Obtains the remote playback state. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Return value

Type	Description
Promise<AVPlaybackState>	Promise used to return the remote playback state.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception

Example

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

aVCastController.getAVPlaybackState().then((state: avSession.AVPlaybackState) => {
  console.info(`getAVPlaybackState : SUCCESS`);
}).catch((err: BusinessError) => {
  console.error(`getAVPlaybackState BusinessError: code: ${err.code}, message: ${err.message}`);
});

sendControlCommand¹⁰⁺

sendControlCommand(command: AVCastControlCommand): Promise<void>

Sends a control command to the session through the controller. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
command	AVCastControlCommand	Yes	Command to send.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600105	Invalid session command.
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avCommand: avSession.AVCastControlCommand = {command:'play'};
// let avCommand = {command:'pause'};
// let avCommand = {command:'stop'};
// let avCommand = {command:'playNext'};
// let avCommand = {command:'playPrevious'};
// let avCommand = {command:'fastForward'};
// let avCommand = {command:'rewind'};
// let avCommand = {command:'seek', parameter:10};
aVCastController.sendControlCommand(avCommand).then(() => {
  console.info(`SendControlCommand successfully`);
}).catch((err: BusinessError) => {
  console.error(`SendControlCommand BusinessError: code: ${err.code}, message: ${err.message}`);
});

sendControlCommand¹⁰⁺

sendControlCommand(command: AVCastControlCommand, callback: AsyncCallback<void>): void

Sends a control command to the session through the controller. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
command	AVCastControlCommand	Yes	Command to send.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600105	Invalid session command.
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avCommand: avSession.AVCastControlCommand = {command:'play'};
// let avCommand = {command:'pause'};
// let avCommand = {command:'stop'};
// let avCommand = {command:'playNext'};
// let avCommand = {command:'playPrevious'};
// let avCommand = {command:'fastForward'};
// let avCommand = {command:'rewind'};
// let avCommand = {command:'seek', parameter:10};
aVCastController.sendControlCommand(avCommand, (err: BusinessError) => {
  if (err) {
    console.error(`SendControlCommand BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`SendControlCommand successfully`);
  }
});

prepare¹⁰⁺

prepare(item: AVQueueItem, callback: AsyncCallback<void>): void

Prepares for the playback of a media asset, that is, loads and buffers a media asset. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
item	AVQueueItem	Yes	Attributes of an item in the playlist.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

// Set playback parameters.
let playItem: avSession.AVQueueItem = {
  itemId: 0,
  description: {
    assetId: '12345',
    mediaType: 'AUDIO',
    mediaUri: 'http://resource1_address',
    mediaSize: 12345,
    startPosition: 0,
    duration: 0,
    artist: 'mysong',
    albumTitle: 'song1_title',
    albumCoverUri: "http://resource1_album_address",
    lyricUri: "http://resource1_lyric_address",
    appName: 'MyMusic'
  }
};
// Prepare for playback. This operation triggers loading and buffering, but not the actual playback.
aVCastController.prepare(playItem, (err: BusinessError) => {
  if (err) {
    console.error(`prepare BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`prepare successfully`);
  }
});

prepare¹⁰⁺

prepare(item: AVQueueItem): Promise<void>

Prepares for the playback of a media asset, that is, loads and buffers a media asset. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
item	AVQueueItem	Yes	Attributes of an item in the playlist.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

// Set playback parameters.
let playItem: avSession.AVQueueItem = {
  itemId: 0,
  description: {
    assetId: '12345',
    mediaType: 'AUDIO',
    mediaUri: 'http://resource1_address',
    mediaSize: 12345,
    startPosition: 0,
    duration: 0,
    artist: 'mysong',
    albumTitle: 'song1_title',
    albumCoverUri: "http://resource1_album_address",
    lyricUri: "http://resource1_lyric_address",
    appName: 'MyMusic'
  }
};
// Prepare for playback. This operation triggers loading and buffering, but not the actual playback.
aVCastController.prepare(playItem).then(() => {
  console.info(`prepare successfully`);
}).catch((err: BusinessError) => {
  console.error(`prepare BusinessError: code: ${err.code}, message: ${err.message}`);
});

start¹⁰⁺

start(item: AVQueueItem, callback: AsyncCallback<void>): void

Prepares for the playback of a media asset. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
item	AVQueueItem	Yes	Attributes of an item in the playlist.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

// Set playback parameters.
let playItem: avSession.AVQueueItem = {
  itemId: 0,
  description: {
    assetId: '12345',
    mediaType: 'AUDIO',
    mediaUri: 'http://resource1_address',
    mediaSize: 12345,
    startPosition: 0,
    duration: 0,
    artist: 'mysong',
    albumTitle: 'song1_title',
    albumCoverUri: "http://resource1_album_address",
    lyricUri: "http://resource1_lyric_address",
    appName: 'MyMusic'
  }
};

// Start playback.
aVCastController.start(playItem, (err: BusinessError) => {
  if (err) {
    console.error(`start BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`start successfully`);
  }
});

start¹⁰⁺

start(item: AVQueueItem): Promise<void>

Prepares for the playback of a media asset. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
item	AVQueueItem	Yes	Attributes of an item in the playlist.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600109	The remote connection is not established.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

// Set playback parameters.
let playItem: avSession.AVQueueItem = {
  itemId: 0,
  description: {
    assetId: '12345',
    mediaType: 'AUDIO',
    mediaUri: 'http://resource1_address',
    mediaSize: 12345,
    startPosition: 0,
    duration: 0,
    artist: 'mysong',
    albumTitle: 'song1_title',
    albumCoverUri: "http://resource1_album_address",
    lyricUri: "http://resource1_lyric_address",
    appName: 'MyMusic'
  }
};
// Start playback.
aVCastController.start(playItem).then(() => {
  console.info(`start successfully`);
}).catch((err: BusinessError) => {
  console.info(`start BusinessError: code: ${err.code}, message: ${err.message}`);
});

getCurrentItem¹⁰⁺

getCurrentItem(callback: AsyncCallback<AVQueueItem>): void

Obtains the information about the media asset that is being played. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<AVQueueItem>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

aVCastController.getCurrentItem((err: BusinessError, value: avSession.AVQueueItem) => {
  if (err) {
    console.error(`getCurrentItem BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`getCurrentItem successfully`);
  }
});

getCurrentItem¹⁰⁺

getCurrentItem(): Promise<AVQueueItem>

Obtains the information about the media asset that is being played. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Return value

Type	Description
Promise<AVQueueItem>	Promise used to return the media asset obtained. If the operation fails, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

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

aVCastController.getCurrentItem().then((value: avSession.AVQueueItem) => {
  console.info(`getCurrentItem successfully`);
}).catch((err: BusinessError) => {
  console.error(`getCurrentItem BusinessError: code: ${err.code}, message: ${err.message}`);
});

on(‘playbackStateChange’)¹⁰⁺

on(type: ‘playbackStateChange’, filter: Array<keyof AVPlaybackState>|‘all’, callback: (state: AVPlaybackState) => void): void

Subscribes to playback state change events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘playbackStateChange’ is triggered when the playback state changes.
filter	Array<keyof&nbsp;AVPlaybackState>&nbsp;&#124;&nbsp;‘all’	Yes	The value ‘all’ indicates that any playback state field change will trigger the event, and Array indicates that only changes to the listed playback state field will trigger the event.
callback	(state: AVPlaybackState) => void	Yes	Callback used for subscription. The state parameter in the callback indicates the changed playback state.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.on('playbackStateChange', 'all', (playbackState: avSession.AVPlaybackState) => {
  console.info(`on playbackStateChange state : ${playbackState.state}`);
});

let playbackFilter = ['state', 'speed', 'loopMode'];
aVCastController.on('playbackStateChange', playbackFilter, (playbackState: avSession.AVPlaybackState) => {
  console.info(`on playbackStateChange state : ${playbackState.state}`);
});

off(‘playbackStateChange’)¹⁰⁺

off(type: ‘playbackStateChange’, callback?: (state: AVPlaybackState) => void): void

Unsubscribes from playback state change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘playbackStateChange’ in this case.
callback	(state: AVPlaybackState) => void	No	Callback used for unsubscription. The state parameter in the callback indicates the changed playback state. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.off('playbackStateChange');

on(‘mediaItemChange’)¹⁰⁺

on(type: ‘mediaItemChange’, callback: Callback<AVQueueItem>): void

Subscribes to media asset change events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘mediaItemChange’ is triggered when the media content being played changes.
callback	(state: AVQueueItem) => void	Yes	Callback used for subscription. AVQueueItem is the media asset that is being played.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.on('mediaItemChange', (item: avSession.AVQueueItem) => {
  console.info(`on mediaItemChange state : ${item.itemId}`);
});

off(‘mediaItemChange’)¹⁰⁺

off(type: ‘mediaItemChange’): void

Unsubscribes from media asset change events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘mediaItemChange’ in this case.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.off('mediaItemChange');

on(‘playNext’)¹⁰⁺

on(type: ‘playNext’, callback: Callback<void>): void

Subscribes to playNext command events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘playNext’ is triggered when the command for playing the next item is received.
callback	Callback<void>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.on('playNext', () => {
  console.info(`on playNext`);
});

off(‘playNext’)¹⁰⁺

off(type: ‘playNext’): void

Unsubscribes from playNext command events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘playNext’ in this case.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.off('playNext');

on(‘playPrevious’)¹⁰⁺

on(type: ‘playPrevious’, callback: Callback<void>): void

Subscribes to playPrevious command events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘playPrevious’ is triggered when the command for playing the previous event is received.
callback	Callback<void>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.on('playPrevious', () => {
  console.info(`on playPrevious`);
});

off(‘playPrevious’)¹⁰⁺

off(type: ‘playPrevious’): void

Unsubscribes from playPrevious command events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘playPrevious’ in this case.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.off('playPrevious');

on(‘seekDone’)¹⁰⁺

on(type: ‘seekDone’, callback: Callback<number>): void

Subscribes to seek done events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘seekDone’ is triggered when the seek operation is complete.
callback	Callback<number>	Yes	Callback used to return the position after the seek operation.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.on('seekDone', (pos: number) => {
  console.info(`on seekDone pos: ${pos} `);
});

off(‘seekDone’)¹⁰⁺

off(type: ‘seekDone’): void

Unsubscribes from the seek done events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘seekDone’ in this case.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.off('seekDone');

on(‘videoSizeChange’)¹⁰⁺

on(type: ‘videoSizeChange’, callback: (width:number, height:number) => void): void

Subscribes to video size change events.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘videoSizeChange’ is triggered when the video size changes.
callback	(width:number, height:number) => void	Yes	Callback used to return the video width and height.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.on('videoSizeChange', (width: number, height: number) => {
  console.info(`width : ${width} `);
  console.info(`height: ${height} `);
});

off(‘videoSizeChange’)¹⁰⁺

off(type: ‘videoSizeChange’): void

Unsubscribes from video size changes.

System capability: SystemCapability.Multimedia.AVSession.AVCast

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘videoSizeChange’ in this case.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.

Example

aVCastController.off('videoSizeChange');

on(‘error’)¹⁰⁺

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

Subscribes to remote AVPlayer errors. This event is used only for error prompt and does not require the user to stop playback control.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘error’ in this case. This event can be triggered by both user operations and the system.
callback	function	Yes	Callback used to return the error code ID and error message.

Error codes

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

ID	Error Message
5400101	No memory.
5400102	Operation not allowed.
5400103	I/O error.
5400104	Time out.
5400105	Service died.
5400106	Unsupport format.
6600101	Session service exception.

Example

import { BusinessError } from '@ohos.base'

aVCastController.on('error', (error: BusinessError) => {
  console.error('error happened,and error message is :' + error.message)
  console.error('error happened,and error code is :' + error.code)
})

off(‘error’)¹⁰⁺

off(type: ‘error’): void

Unsubscribes from remote AVPlayer errors.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘error’ in this case.

Error codes

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

ID	Error Message
5400101	No memory.
5400102	Operation not allowed.
5400103	I/O error.
5400104	Time out.
5400105	Service died.
5400106	Unsupport format.
6600101	Session service exception.

Example

aVCastController.off('error')

ConnectionState¹⁰⁺

Enumerates the connection states.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Value	Description
STATE_CONNECTING	0	The device is connecting.
STATE_CONNECTED	1	The device is connected.
STATE_DISCONNECTED	6	The device is disconnected.

AVMetadata¹⁰⁺

Describes the media metadata.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
assetId	string	Yes	Media ID.
title	string	No	Title.
artist	string	No	Artist.
author	string	No	Author.
album	string	No	Album name.
writer	string	No	Writer.
composer	string	No	composer.
duration	number	No	Media duration, in ms.
mediaImage	image.PixelMap | string	No	Pixel map or image path (local path or network path) of the image.
publishDate	Date	No	Release date.
subtitle	string	No	Subtitle.
description	string	No	Media description.
lyric	string	No	Lyric file path (local path or network path).
previousAssetId	string	No	ID of the previous media asset.
nextAssetId	string	No	ID of the next media asset.

AVMediaDescription¹⁰⁺

Describes the attributes related to the media metadata in the playlist.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
assetId	string	Yes	Media ID in the playlist.
title	string	No	Name of the media asset in the playlist.
subtitle	string	No	Subname of the media asset in the playlist.
description	string	No	Description of the media asset in the playlist.
mediaImage	image.PixelMap	No	Pixel map of the image of the media asset in the playlist.
extras	{[key: string]: any}	No	Additional fields of the media asset in the playlist.
mediaUri	string	No	URI of the media asset in the playlist.
mediaType	string	No	Type of the media asset in the playlist.
mediaSize	number	No	Size of the media asset in the playlist.
albumTitle	string	No	Album name of the media asset in the playlist.
albumCoverUri	string	No	URI of the album title of the media asset in the playlist.
lyricContent	string	No	Lyric content of the media asset in the playlist.
lyricUri	string	No	Lyric URI of the media asset in the playlist.
artist	string	No	Author of the lyric of the media asset in the playlist.
fdSrc	media.AVFileDescriptor	No	Handle to the local media file in the playlist.
duration	number	No	Playback duration of the media asset in the playlist.
startPosition	number	No	Start position for playing the media asset in the playlist.
creditsPosition	number	No	Position for playing the closing credits of the media asset in the playlist.
appName	string	No	Name of the application provided by the playlist.

AVQueueItem¹⁰⁺

Describes the attributes of an item in the playlist.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
itemId	number	Yes	ID of an item in the playlist.
description	AVMediaDescription	Yes	Media metadata of the item in the playlist.

AVPlaybackState¹⁰⁺

Describes the information related to the media playback state.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
state	PlaybackState	No	Playback state.
speed	number	No	Playback speed.
position	PlaybackPosition	No	Playback position.
bufferedTime	number	No	Buffered time.
loopMode	LoopMode	No	Loop mode.
isFavorite	boolean	No	Whether the media asset is favorited.
activeItemId10+	number	No	ID of the item that is being played.
volume10+	number	No	Media volume.
extras10+	{[key: string]: Object}	No	Custom media data.

PlaybackPosition¹⁰⁺

Describes the information related to the playback position.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
elapsedTime	number	Yes	Elapsed time, in ms.
updateTime	number	Yes	Updated time, in ms.

AVCastCategory¹⁰⁺

Enumerates the cast categories.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Name	Value	Description
CATEGORY_LOCAL	0	Local playback. The sound is played from the local device or a connected Bluetooth headset by default.
CATEGORY_REMOTE	1	Remote playback. The sound or images are played from a remote device.

DeviceType¹⁰⁺

Enumerates the output device types.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Value	Description
DEVICE_TYPE_LOCAL	0	Local device.
DEVICE_TYPE_BLUETOOTH	10	Bluetooth device.
DEVICE_TYPE_TV	2	TV. System capability: SystemCapability.Multimedia.AVSession.AVCast
DEVICE_TYPE_SMART_SPEAKER	3	Speaker. System capability: SystemCapability.Multimedia.AVSession.AVCast

DeviceInfo¹⁰⁺

Describes the information related to the output device.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
castCategory	AVCastCategory	Yes	Cast category.
deviceId	string	Yes	ID of the output device.
deviceName	string	Yes	Name of the output device.
deviceType	DeviceType	Yes	Type of the output device.
ipAddress	string	No	IP address of the output device. This is a system API. System capability: SystemCapability.Multimedia.AVSession.AVCast
providerId	number	No	Vendor of the output device. This is a system API. System capability: SystemCapability.Multimedia.AVSession.AVCast

OutputDeviceInfo¹⁰⁺

Describes the information related to the output device.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
devices	Array<DeviceInfo>	Yes	Output devices.

LoopMode¹⁰⁺

Enumerates the loop modes of media playback.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Value	Description
LOOP_MODE_SEQUENCE	0	Sequential playback.
LOOP_MODE_SINGLE	1	Single loop.
LOOP_MODE_LIST	2	Playlist loop.
LOOP_MODE_SHUFFLE	3	Shuffle.

PlaybackState¹⁰⁺

Enumerates the media playback states.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Value	Description
PLAYBACK_STATE_INITIAL	0	Initial.
PLAYBACK_STATE_PREPARE	1	Preparing.
PLAYBACK_STATE_PLAY	2	Playing.
PLAYBACK_STATE_PAUSE	3	Paused.
PLAYBACK_STATE_FAST_FORWARD	4	Fast-forwarding.
PLAYBACK_STATE_REWIND	5	Rewinding.
PLAYBACK_STATE_STOP	6	Stop the playback.
PLAYBACK_STATE_COMPLETED	7	Playback complete.
PLAYBACK_STATE_RELEASED	8	Released.
PLAYBACK_STATE_ERROR	9	Error.

AVSessionDescriptor

Declares the session descriptor.

System capability: SystemCapability.Multimedia.AVSession.Manager

System API: This is a system API.

Name	Type	Readable	Writable	Description
sessionId	string	Yes	No	Session ID.
type	AVSessionType	Yes	No	Session type.
sessionTag	string	Yes	No	Custom session name.
elementName	ElementName	Yes	No	Information about the application to which the session belongs, including the bundle name and ability name.
isActive	boolean	Yes	No	Whether the session is activated.
isTopSession	boolean	Yes	No	Whether the session is the top session.
outputDevice	OutputDeviceInfo	Yes	No	Information about the output device.

AVSessionController¹⁰⁺

An AV session controller is created by calling avSession.createController. Through the controller, you can query the session ID, send commands and events to a session, and obtain session metadata and playback state information.

Attributes

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Readable	Writable	Description
sessionId	string	Yes	No	Unique session ID of the AVSessionController object.

Example

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

let AVSessionController: avSession.AVSessionController;
avSession.createController(currentAVSession.sessionId).then((controller: avSession.AVSessionController) => {
  AVSessionController = controller;
}).catch((err: BusinessError) => {
  console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
});

getAVPlaybackState¹⁰⁺

getAVPlaybackState(callback: AsyncCallback<AVPlaybackState>): void

Obtains the remote playback state. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<[AVPlaybackState>	Yes	Callback used to return the remote playback state.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVPlaybackState((err: BusinessError, state: avSession.AVPlaybackState) => {
  if (err) {
    console.error(`getAVPlaybackState BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`getAVPlaybackState : SUCCESS`);
  }
});

getAVPlaybackState¹⁰⁺

getAVPlaybackState(): Promise<AVPlaybackState>;

Obtains the remote playback state. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<AVPlaybackState>	Promise used to return the remote playback state.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVPlaybackState().then((state: avSession.AVPlaybackState) => {
  console.info(`getAVPlaybackState : SUCCESS`);
}).catch((err: BusinessError) => {
  console.error(`getAVPlaybackState BusinessError: code: ${err.code}, message: ${err.message}`);
});

getAVMetadata¹⁰⁺

getAVMetadata(): Promise<AVMetadata>

Obtains the session metadata. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<AVMetadata>	Promise used to return the metadata obtained.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVMetadata().then((metadata: avSession.AVMetadata) => {
  console.info(`GetAVMetadata : SUCCESS : assetId : ${metadata.assetId}`);
}).catch((err: BusinessError) => {
  console.error(`GetAVMetadata BusinessError: code: ${err.code}, message: ${err.message}`);
});

getAVMetadata¹⁰⁺

getAVMetadata(callback: AsyncCallback<AVMetadata>): void

Obtains the session metadata. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<AVMetadata>	Yes	Callback used to return the metadata obtained.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVMetadata((err: BusinessError, metadata: avSession.AVMetadata) => {
  if (err) {
    console.error(`GetAVMetadata BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetAVMetadata : SUCCESS : assetId : ${metadata.assetId}`);
  }
});

getAVQueueTitle¹⁰⁺

getAVQueueTitle(): Promise<string>

Obtains the name of the playlist. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise	Promise used to return the playlist name.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVQueueTitle().then((title: string) => {
  console.info(`GetAVQueueTitle : SUCCESS : title : ${title}`);
}).catch((err: BusinessError) => {
  console.error(`GetAVQueueTitle BusinessError: code: ${err.code}, message: ${err.message}`);
});

getAVQueueTitle¹⁰⁺

getAVQueueTitle(callback: AsyncCallback<string>): void

Obtains the name of the playlist. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback	Yes	Callback used to return the playlist name.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVQueueTitle((err: BusinessError, title: string) => {
  if (err) {
    console.error(`GetAVQueueTitle BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetAVQueueTitle : SUCCESS : title : ${title}`);
  }
});

getAVQueueItems¹⁰⁺

getAVQueueItems(): Promise<Array<AVQueueItem>>

Obtains the information related to the items in the queue. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise>	Promise used to return the items in the queue.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVQueueItems().then((items: avSession.AVQueueItem[]) => {
  console.info(`GetAVQueueItems : SUCCESS : length : ${items.length}`);
}).catch((err: BusinessError) => {
  console.error(`GetAVQueueItems BusinessError: code: ${err.code}, message: ${err.message}`);
});

getAVQueueItems¹⁰⁺

getAVQueueItems(callback: AsyncCallback<Array<AVQueueItem>>): void

Obtains the information related to the items in the playlist. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback>	Yes	Callback used to return the items in the playlist.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getAVQueueItems((err: BusinessError, items: avSession.AVQueueItem[]) => {
  if (err) {
    console.error(`GetAVQueueItems BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetAVQueueItems : SUCCESS : length : ${items.length}`);
  }
});

skipToQueueItem¹⁰⁺

skipToQueueItem(itemId: number): Promise<void>

Sends the ID of an item in the playlist to the session for processing. The session can play the song. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
itemId	number	Yes	ID of an item in the playlist.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the item ID is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

let queueItemId = 0;
avsessionController.skipToQueueItem(queueItemId).then(() => {
  console.info(`SkipToQueueItem successfully`);
}).catch((err: BusinessError) => {
  console.error(`SkipToQueueItem BusinessError: code: ${err.code}, message: ${err.message}`);
});

skipToQueueItem¹⁰⁺

skipToQueueItem(itemId: number, callback: AsyncCallback<void>): void

Sends the ID of an item in the playlist to the session for processing. The session can play the song. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
itemId	number	Yes	ID of an item in the playlist.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the setting is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

let queueItemId = 0;
avsessionController.skipToQueueItem(queueItemId, (err: BusinessError) => {
  if (err) {
    console.error(`SkipToQueueItem BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`SkipToQueueItem successfully`);
  }
});

getOutputDevice¹⁰⁺

getOutputDevice(): Promise<OutputDeviceInfo>

Obtains the output device information. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<OutputDeviceInfo>	Promise used to return the information obtained.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
600101	Session service exception.
600103	The session controller does not exist.

Example

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

avsessionController.getOutputDevice().then((deviceInfo: avSession.OutputDeviceInfo) => {
  console.info(`GetOutputDevice : SUCCESS`);
}).catch((err: BusinessError) => {
  console.error(`GetOutputDevice BusinessError: code: ${err.code}, message: ${err.message}`);
});

getOutputDevice¹⁰⁺

getOutputDevice(callback: AsyncCallback<OutputDeviceInfo>): void

Obtains the output device information. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<OutputDeviceInfo>	Yes	Callback used to return the information obtained.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
600101	Session service exception.
600103	The session controller does not exist.

Example

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

avsessionController.getOutputDevice((err: BusinessError, deviceInfo: avSession.OutputDeviceInfo) => {
  if (err) {
    console.error(`GetOutputDevice BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetOutputDevice : SUCCESS`);
  }
});

sendAVKeyEvent¹⁰⁺

sendAVKeyEvent(event: KeyEvent): Promise<void>

Sends a key event to the session corresponding to this controller. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
event	KeyEvent	Yes	Key event.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
600101	Session service exception.
600102	The session does not exist.
600103	The session controller does not exist.
600105	Invalid session command.
600106	The session is not activated.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the event is sent, no value is returned; otherwise, an error object is returned.

Example

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

let keyItem: keyEvent.Key = {code:0x49, pressedTime:2, deviceId:0};
let event: keyEvent.KeyEvent = {id:1, deviceId:0, actionTime:1, screenId:1, windowId:1, action:2, key:keyItem, unicodeChar:0, keys:[keyItem], ctrlKey:false, altKey:false, shiftKey:false, logoKey:false, fnKey:false, capsLock:false, numLock:false, scrollLock:false};

avsessionController.sendAVKeyEvent(event).then(() => {
  console.info(`SendAVKeyEvent Successfully`);
}).catch((err: BusinessError) => {
  console.error(`SendAVKeyEvent BusinessError: code: ${err.code}, message: ${err.message}`);
});

sendAVKeyEvent¹⁰⁺

sendAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void

Sends a key event to the session corresponding to this controller. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
event	KeyEvent	Yes	Key event.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the event is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
600101	Session service exception.
600102	The session does not exist.
600103	The session controller does not exist.
600105	Invalid session command.
600106	The session is not activated.

Example

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

let keyItem: keyEvent.Key = {code:0x49, pressedTime:2, deviceId:0};
let event: keyEvent.KeyEvent = {id:1, deviceId:0, actionTime:1, screenId:1, windowId:1, action:2, key:keyItem, unicodeChar:0, keys:[keyItem], ctrlKey:false, altKey:false, shiftKey:false, logoKey:false, fnKey:false, capsLock:false, numLock:false, scrollLock:false};

avsessionController.sendAVKeyEvent(event, (err: BusinessError) => {
  if (err) {
    console.error(`SendAVKeyEvent BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`SendAVKeyEvent Successfully`);
  }
});

getLaunchAbility¹⁰⁺

getLaunchAbility(): Promise<WantAgent>

Obtains the WantAgent object saved by the application in the session. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<WantAgent>	Promise used to return the object saved by calling setLaunchAbility. The object includes the application attribute, such as the bundle name, ability name, and device ID.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getLaunchAbility().then((agent: object) => {
  console.info(`GetLaunchAbility : SUCCESS : wantAgent : ${agent}`);
}).catch((err: BusinessError) => {
  console.error(`GetLaunchAbility BusinessError: code: ${err.code}, message: ${err.message}`);
});

getLaunchAbility¹⁰⁺

getLaunchAbility(callback: AsyncCallback<WantAgent>): void

Obtains the WantAgent object saved by the application in the session. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<WantAgent>	Yes	Callback used to return the object saved by calling setLaunchAbility. The object includes the application attribute, such as the bundle name, ability name, and device ID.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getLaunchAbility((err: BusinessError, agent: object) => {
  if (err) {
    console.error(`GetLaunchAbility BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetLaunchAbility : SUCCESS : wantAgent : ${agent}`);
  }
});

getRealPlaybackPositionSync¹⁰⁺

getRealPlaybackPositionSync(): number

Obtains the playback position.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
number	Playback position, in milliseconds.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

let time: number = avsessionController.getRealPlaybackPositionSync();

isActive¹⁰⁺

isActive(): Promise<boolean>

Checks whether the session is activated. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise	Promise used to return the activation state. If the session is activated, true is returned; otherwise, false is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.isActive().then((isActive: boolean) => {
  console.info(`IsActive : SUCCESS : isactive : ${isActive}`);
}).catch((err: BusinessError) => {
  console.error(`IsActive BusinessError: code: ${err.code}, message: ${err.message}`);
});

isActive¹⁰⁺

isActive(callback: AsyncCallback<boolean>): void

Checks whether the session is activated. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback	Yes	Callback used to return the activation state. If the session is activated, true is returned; otherwise, false is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.isActive((err: BusinessError, isActive: boolean) => {
  if (err) {
    console.error(`IsActive BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`IsActive : SUCCESS : isactive : ${isActive}`);
  }
});

destroy¹⁰⁺

destroy(): Promise<void>

Destroys this controller. A controller can no longer be used after being destroyed. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<void>	Promise used to return the result. If the controller is destroyed, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

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

avsessionController.destroy().then(() => {
  console.info(`Destroy : SUCCESS `);
}).catch((err: BusinessError) => {
  console.error(`Destroy BusinessError: code: ${err.code}, message: ${err.message}`);
});

destroy¹⁰⁺

destroy(callback: AsyncCallback<void>): void

Destroys this controller. A controller can no longer be used after being destroyed. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the controller is destroyed, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

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

avsessionController.destroy((err: BusinessError) => {
  if (err) {
    console.error(`Destroy BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`Destroy : SUCCESS `);
  }
});

getValidCommands¹⁰⁺

getValidCommands(): Promise<Array<AVControlCommandType>>

Obtains valid commands supported by the session. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise>	Promise used to return a set of valid commands.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getValidCommands.then((validCommands: avSession.AVControlCommandType[]) => {
  console.info(`GetValidCommands : SUCCESS : size : ${validCommands.length}`);
}).catch((err: BusinessError) => {
  console.error(`GetValidCommands BusinessError: code: ${err.code}, message: ${err.message}`);
});

getValidCommands¹⁰⁺

getValidCommands(callback: AsyncCallback<Array<AVControlCommandType>>): void

Obtains valid commands supported by the session. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<Array<AVControlCommandType>>	Yes	Callback used to return a set of valid commands.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

avsessionController.getValidCommands((err: BusinessError, validCommands: avSession.AVControlCommandType[]) => {
  if (err) {
    console.error(`GetValidCommands BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.info(`GetValidCommands : SUCCESS : size : ${validCommands.length}`);
  }
});

sendControlCommand¹⁰⁺

sendControlCommand(command: AVControlCommand): Promise<void>

Sends a control command to the session through the controller. This API uses a promise to return the result.

NOTE

Before using sendControlCommand, the controller must ensure that the corresponding listeners are registered for the media session. For details about how to register the listeners, see on’play’, on’pause’, and the like.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
command	AVControlCommand	Yes	Command to send.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.
6600105	Invalid session command.
6600106	The session is not activated.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avCommand: avSession.AVControlCommand = {command:'play'};
// let avCommand = {command:'pause'};
// let avCommand = {command:'stop'};
// let avCommand = {command:'playNext'};
// let avCommand = {command:'playPrevious'};
// let avCommand = {command:'fastForward'};
// let avCommand = {command:'rewind'};
// let avCommand = {command:'seek', parameter:10};
// let avCommand = {command:'setSpeed', parameter:2.6};
// let avCommand = {command:'setLoopMode', parameter:avSession.LoopMode.LOOP_MODE_SINGLE};
// let avCommand = {command:'toggleFavorite', parameter:"false"};
avsessionController.sendControlCommand(avCommand).then(() => {
  console.info(`SendControlCommand successfully`);
}).catch((err: BusinessError) => {
  console.error(`SendControlCommand BusinessError: code: ${err.code}, message: ${err.message}`);
});

sendControlCommand¹⁰⁺

sendControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void

Sends a control command to the session through the controller. This API uses an asynchronous callback to return the result.

NOTE

Before using sendControlCommand, the controller must ensure that the corresponding listeners are registered for the media session. For details about how to register the listeners, see on’play’, on’pause’, and the like.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
command	AVControlCommand	Yes	Command to send.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.
6600105	Invalid session command.
6600106	The session is not activated.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avCommand: avSession.AVControlCommand = {command:'play'};
// let avCommand = {command:'pause'};
// let avCommand = {command:'stop'};
// let avCommand = {command:'playNext'};
// let avCommand = {command:'playPrevious'};
// let avCommand = {command:'fastForward'};
// let avCommand = {command:'rewind'};
// let avCommand = {command:'seek', parameter:10};
// let avCommand = {command:'setSpeed', parameter:2.6};
// let avCommand = {command:'setLoopMode', parameter:avSession.LoopMode.LOOP_MODE_SINGLE};
// let avCommand = {command:'toggleFavorite', parameter:"false"};
avsessionController.sendControlCommand(avCommand, (err: BusinessError) => {
  if (err) {
    console.info(`SendControlCommand BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    console.error(`SendControlCommand successfully`);
  }
});

sendCommonCommand¹⁰⁺

sendCommonCommand(command: string, args: {[key: string]: Object}): Promise<void>

Sends a custom control command to the session through the controller. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
command	string	Yes	Name of the custom control command.
args	{[key: string]: any}	Yes	Parameters in key-value pair format carried in the custom control command.

NOTE

The args parameter supports the following data types: string, number, Boolean, object, array, and file descriptor. For details, see @ohos.app.ability.Want (Want).

Return value

Type	Description
Promise<void>	Promise used to return the result. If the command is sent, no value is returned; otherwise, an error object is returned.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.
6600105	Invalid session command.
6600106	The session is not activated.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avSessionController: avSession.AVSessionController|undefined = undefined;
let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);
let sessionId: string = "";
avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  sessionId = (currentAVSession as avSession.AVSession).sessionId;
  avSession.createController(sessionId).then((controller: avSession.AVSessionController) => {
    avSessionController = controller;
  }).catch((err: BusinessError) => {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

let commandName = "my_command";
if (avSessionController !== undefined) {
  (avSessionController as avSession.AVSessionController).sendCommonCommand(commandName, {command : "This is my command"}).then(() => {
    console.info(`SendCommonCommand successfully`);
  }).catch((err: BusinessError) => {
    console.info(`SendCommonCommand BusinessError: code: ${err.code}, message: ${err.message}`);
  })
}

sendCommonCommand¹⁰⁺

sendCommonCommand(command: string, args: {[key: string]: Object}, callback: AsyncCallback<void>): void

Sends a custom control command to the session through the controller. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
command	string	Yes	Name of the custom control command.
args	{[key: string]: any}	Yes	Parameters in key-value pair format carried in the custom control command.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the command is sent, err is undefined; otherwise, err is an error object.

NOTE The args parameter supports the following data types: string, number, Boolean, object, array, and file descriptor. For details, see @ohos.app.ability.Want (Want).

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.
6600105	Invalid session command.
6600106	The session is not activated.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';
let avSessionController: avSession.AVSessionController|undefined = undefined;
let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  avSession.createController((currentAVSession as avSession.AVSession).sessionId).then((controller: avSession.AVSessionController) => {
    avSessionController = controller;
  }).catch((err: BusinessError) => {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

let commandName = "my_command";
if (avSessionController !== undefined) {
  (avSessionController as avSession.AVSessionController).sendCommonCommand(commandName, {command : "This is my command"}, (err: BusinessError) => {
    if(err) {
        console.info(`SendCommonCommand BusinessError: code: ${err.code}, message: ${err.message}`);
    }
  })
}

getExtras¹⁰⁺

getExtras(): Promise<{[key: string]: Object}>

Obtains the custom media packet set by the provider. This API uses a promise to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Promise<{[key: string]: Object}>	Promise used to return the custom media packet. The content of the packet is the same as that set in setExtras.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.
6600105	Invalid session command.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avSessionController: avSession.AVSessionController|undefined = undefined;
let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  avSession.createController((currentAVSession as avSession.AVSession).sessionId).then((controller: avSession.AVSessionController) => {
    avSessionController = controller;
  }).catch((err: BusinessError) => {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

if (avSessionController !== undefined) {
  (avSessionController as avSession.AVSessionController).getExtras().then((extras) => {
    console.info(`getExtras : SUCCESS : ${extras}`);
  }).catch((err: BusinessError) => {
    console.info(`getExtras BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

getExtras¹⁰⁺

getExtras(callback: AsyncCallback<{[key: string]: Object}>): void

Obtains the custom media packet set by the provider. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<{[key: string]: Object}>	Yes	Callback used to return the custom media packet. The content of the packet is the same as that set in setExtras.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.
6600105	Invalid session command.
6600107	Too many commands or events.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avSessionController: avSession.AVSessionController|undefined = undefined;
let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  avSession.createController((currentAVSession as avSession.AVSession).sessionId).then((controller: avSession.AVSessionController) => {
    avSessionController = controller;
  }).catch((err: BusinessError) => {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

if (avSessionController !== undefined) {
  (avSessionController as avSession.AVSessionController).getExtras((err, extras) => {
    if (err) {
      console.error(`getExtras BusinessError: code: ${err.code}, message: ${err.message}`);
    } else {
      console.info(`getExtras : SUCCESS : ${extras}`);
    }
  });
}

on(‘metadataChange’)¹⁰⁺

on(type: ‘metadataChange’, filter: Array<keyof AVMetadata>|‘all’, callback: (data: AVMetadata) => void)

Subscribes to metadata change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘metadataChange’ is triggered when the session metadata changes.
filter	Array<keyof&nbsp;AVMetadata>&nbsp;&#124;&nbsp;‘all’	Yes	The value ‘all’ indicates that any metadata field change will trigger the event, and Array indicates that only changes to the listed metadata field will trigger the event.
callback	(data: AVMetadata) => void	Yes	Callback used for subscription. The data parameter in the callback indicates the changed metadata.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('metadataChange', 'all', (metadata: avSession.AVMetadata) => {
  console.info(`on metadataChange assetId : ${metadata.assetId}`);
});

avsessionController.on('metadataChange', ['assetId', 'title', 'description'], (metadata: avSession.AVMetadata) => {
  console.info(`on metadataChange assetId : ${metadata.assetId}`);
});

off(‘metadataChange’)¹⁰⁺

off(type: ‘metadataChange’, callback?: (data: AVMetadata) => void)

Unsubscribes from metadata change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘metadataChange’ in this case.
callback	(data: AVMetadata) => void	No	Callback used for subscription. The data parameter in the callback indicates the changed metadata. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('metadataChange');

on(‘playbackStateChange’)¹⁰⁺

on(type: ‘playbackStateChange’, filter: Array<keyof AVPlaybackState>|‘all’, callback: (state: AVPlaybackState) => void)

Subscribes to playback state change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘playbackStateChange’ is triggered when the playback state changes.
filter	Array<keyof&nbsp;AVPlaybackState>&nbsp;&#124;&nbsp;‘all’	Yes	The value ‘all’ indicates that any playback state field change will trigger the event, and Array indicates that only changes to the listed playback state field will trigger the event.
callback	(state: AVPlaybackState) => void	Yes	Callback used for subscription. The state parameter in the callback indicates the changed playback state.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('playbackStateChange', 'all', (playbackState: avSession.AVPlaybackState) => {
  console.info(`on playbackStateChange state : ${playbackState.state}`);
});

avsessionController.on('playbackStateChange', ['state', 'speed', 'loopMode'], (playbackState: avSession.AVPlaybackState) => {
  console.info(`on playbackStateChange state : ${playbackState.state}`);
});

off(‘playbackStateChange’)¹⁰⁺

off(type: ‘playbackStateChange’, callback?: (state: AVPlaybackState) => void)

Unsubscribes from playback state change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘playbackStateChange’ in this case.
callback	(state: AVPlaybackState) => void	No	Callback used for unsubscription. The state parameter in the callback indicates the changed playback state. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('playbackStateChange');

on(‘sessionDestroy’)¹⁰⁺

on(type: ‘sessionDestroy’, callback: () => void)

Subscribes to session destruction events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘sessionDestroy’ is triggered when a session is destroyed.
callback	() => void	Yes	Callback used for subscription. If the subscription is successful, err is undefined; otherwise, err is an error object.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('sessionDestroy', () => {
  console.info(`on sessionDestroy : SUCCESS `);
});

off(‘sessionDestroy’)¹⁰⁺

off(type: ‘sessionDestroy’, callback?: () => void)

Unsubscribes from session destruction events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘sessionDestroy’ in this case.
callback	() => void	No	Callback used for unsubscription. If the unsubscription is successful, err is undefined; otherwise, err is an error object. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('sessionDestroy');

on(‘activeStateChange’)¹⁰⁺

on(type: ‘activeStateChange’, callback: (isActive: boolean) => void)

Subscribes to session activation state change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘activeStateChange’ is triggered when the activation state of the session changes.
callback	(isActive: boolean) => void	Yes	Callback used for subscription. The isActive parameter in the callback specifies whether the session is activated. The value true means that the service is activated, and false means the opposite.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('activeStateChange', (isActive: boolean) => {
  console.info(`on activeStateChange : SUCCESS : isActive ${isActive}`);
});

off(‘activeStateChange’)¹⁰⁺

off(type: ‘activeStateChange’, callback?: (isActive: boolean) => void)

Unsubscribes from session activation state change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘activeStateChange’ in this case.
callback	(isActive: boolean) => void	No	Callback used for unsubscription. The isActive parameter in the callback specifies whether the session is activated. The value true means that the session is activated, and false means the opposite. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('activeStateChange');

on(‘validCommandChange’)¹⁰⁺

on(type: ‘validCommandChange’, callback: (commands: Array<AVControlCommandType>) => void)

Subscribes to valid command change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘validCommandChange’ is triggered when the valid commands supported by the session changes.
callback	(commands: Array<AVControlCommandType>) => void	Yes	Callback used for subscription. The commands parameter in the callback is a set of valid commands.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('validCommandChange', (validCommands: avSession.AVControlCommandType[]) => {
  console.info(`validCommandChange : SUCCESS : size : ${validCommands.length}`);
  console.info(`validCommandChange : SUCCESS : validCommands : ${validCommands.values()}`);
});

off(‘validCommandChange’)¹⁰⁺

off(type: ‘validCommandChange’, callback?: (commands: Array<AVControlCommandType>) => void)

Unsubscribes from valid command change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘validCommandChange’ in this case.
callback	(commands: Array<AVControlCommandType>) => void	No	Callback used for unsubscription. The commands parameter in the callback is a set of valid commands. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('validCommandChange');

on(‘outputDeviceChange’)¹⁰⁺

on(type: ‘outputDeviceChange’, callback: (state: ConnectionState, device: OutputDeviceInfo) => void): void

Subscribes to output device change events.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘outputDeviceChange’ is triggered when the output device changes.
callback	(state: ConnectionState, device: OutputDeviceInfo) => void	Yes	Callback used for subscription. The device parameter in the callback indicates the output device information.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('outputDeviceChange', (state: avSession.ConnectionState, device: avSession.OutputDeviceInfo) => {
  console.info(`on outputDeviceChange state: ${state}, device : ${device}`);
});

off(‘outputDeviceChange’)¹⁰⁺

off(type: ‘outputDeviceChange’, callback?: (state: ConnectionState, device: OutputDeviceInfo) => void): void

Unsubscribes from output device change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘outputDeviceChange’ in this case.
callback	(state: ConnectionState, device: OutputDeviceInfo) => void	No	Callback used for unsubscription. The device parameter in the callback indicates the output device information. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('outputDeviceChange');

on(‘sessionEvent’)¹⁰⁺

on(type: ‘sessionEvent’, callback: (sessionEvent: string, args: {[key:string]: Object}) => void): void

Subscribes to session event change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘sessionEvent’ is triggered when the session event changes.
callback	(sessionEvent: string, args: {[key:string]: object}) => void	Yes	Callback used for subscription. sessionEvent in the callback indicates the name of the session event that changes, and args indicates the parameters carried in the event.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avSessionController: avSession.AVSessionController|undefined = undefined;
let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  avSession.createController((currentAVSession as avSession.AVSession).sessionId).then((controller: avSession.AVSessionController) => {
    avSessionController = controller;
  }).catch((err: BusinessError) => {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

if (avSessionController !== undefined) {
  (avSessionController as avSession.AVSessionController).on('sessionEvent', (sessionEvent, args) => {
    console.info(`OnSessionEvent, sessionEvent is ${sessionEvent}, args: ${JSON.stringify(args)}`);
  });
}

off(‘sessionEvent’)¹⁰⁺

off(type: ‘sessionEvent’, callback?: (sessionEvent: string, args: {[key:string]: Object}) => void): void

Unsubscribes from session event change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘sessionEvent’ in this case.
callback	(sessionEvent: string, args: {[key:string]: Object}) => void	No	Callback used for unsubscription. sessionEvent in the callback indicates the name of the session event that changes, and args indicates the parameters carried in the event. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('sessionEvent');

on(‘queueItemsChange’)¹⁰⁺

on(type: ‘queueItemsChange’, callback: (items: Array<AVQueueItem>) => void): void

Subscribes to playlist item change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘queueItemsChange’ is triggered when one or more items in the playlist changes.
callback	(items: Array<AVQueueItem>) => void	Yes	Callback used for subscription. The items parameter in the callback indicates the changed items in the playlist.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('queueItemsChange', (items: avSession.AVQueueItem[]) => {
  console.info(`OnQueueItemsChange, items length is ${items.length}`);
});

off(‘queueItemsChange’)¹⁰⁺

off(type: ‘queueItemsChange’, callback?: (items: Array<AVQueueItem>) => void): void

Unsubscribes from playback item change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘queueItemsChange’ in this case.
callback	(items: Array<AVQueueItem>) => void	No	Callback used for unsubscription. The items parameter in the callback indicates the changed items in the playlist. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('queueItemsChange');

on(‘queueTitleChange’)¹⁰⁺

on(type: ‘queueTitleChange’, callback: (title: string) => void): void

Subscribes to playlist name change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘queueTitleChange’ is triggered when the playlist name changes.
callback	(title: string) => void	Yes	Callback used for subscription. The title parameter in the callback indicates the changed playlist name.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.on('queueTitleChange', (title: string) => {
  console.info(`queueTitleChange, title is ${title}`);
});

off(‘queueTitleChange’)¹⁰⁺

off(type: ‘queueTitleChange’, callback?: (title: string) => void): void

Unsubscribes from playlist name change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘queueTitleChange’ in this case.
callback	(title: string) => void	No	Callback used for unsubscription. The items parameter in the callback indicates the changed playlist name. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('queueTitleChange');

on(‘extrasChange’)¹⁰⁺

on(type: ‘extrasChange’, callback: (extras: {[key:string]: Object}) => void): void

Subscribes to custom media packet change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type. The event ‘extrasChange’ is triggered when the provider sets a custom media packet.
callback	(extras: {[key:string]: object}) => void	Yes	Callback used for subscription. The extras parameter in the callback indicates the custom media packet set by the provider. This packet is the same as that set in dispatchSessionEvent.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

import avSession from '@ohos.multimedia.avsession';
import { BusinessError } from '@ohos.base';

let avSessionController: avSession.AVSessionController|undefined = undefined;
let currentAVSession: avSession.AVSession|undefined = undefined;
let tag = "createNewSession";
let context: Context = getContext(this);

avSession.createAVSession(context, tag, "audio", (err: BusinessError, data: avSession.AVSession) => {
  if (err) {
    console.info(`CreateAVSession BusinessError: code: ${err.code}, message: ${err.message}`);
  } else {
    currentAVSession = data;
  }
});
if (currentAVSession !== undefined) {
  avSession.createController((currentAVSession as avSession.AVSession).sessionId).then((controller: avSession.AVSessionController) => {
    avSessionController = controller;
  }).catch((err: BusinessError) => {
    console.error(`CreateController BusinessError: code: ${err.code}, message: ${err.message}`);
  });
}

if (avSessionController !== undefined) {
  (avSessionController as avSession.AVSessionController).on('extrasChange', (extras) => {
    console.info(`Caught extrasChange event,the new extra is: ${JSON.stringify(extras)}`);
  });
}

off(‘extrasChange’)¹⁰⁺

off(type: ‘extrasChange’, callback?: (extras: {[key:string]: Object}) => void): void

Unsubscribes from custom media packet change events. This API is called by the controller.

System capability: SystemCapability.Multimedia.AVSession.Core

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Event type, which is ‘extrasChange’ in this case.
callback	({[key:string]: Object}) => void	No	Callback used for unsubscription. The callback parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

avsessionController.off('extrasChange');

getAVPlaybackStateSync¹⁰⁺

getAVPlaybackStateSync(): AVPlaybackState;

Obtains the playback state of this session. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.AVCast

Return value

Type	Description
AVPlaybackState	Playback state of the session.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception

Example

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

try {
  let playbackState: avsession.AVPlaybackState = avsessionController.getAVPlaybackStateSync();
} catch (err: BusinessError) {
  console.info(`getAVPlaybackStateSync error, error code: ${err.code}, error message: ${err.message}`);
}

getAVMetadataSync¹⁰⁺

getAVMetadataSync(): AVMetadata

Obtains the session metadata. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
AVMetadata	Session metadata.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

try {
  let metaData: avsession.AVMetadata = avsessionController.getAVMetadataSync();
} catch (err: BusinessError) {
  console.info(`getAVMetadataSync error, error code: ${err.code}, error message: ${err.message}`);
}

getAVQueueTitleSync¹⁰⁺

getAVQueueTitleSync(): string

Obtains the name of the playlist of this session. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
string	Playlist name.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

try {
  let currentQueueTitle: string = avsessionController.getAVQueueTitleSync();
} catch (err: BusinessError) {
  console.info(`getAVQueueTitleSync error, error code: ${err.code}, error message: ${err.message}`);
}

getAVQueueItemsSync¹⁰⁺

getAVQueueItemsSync(): <Array<AVQueueItem>>

Obtains the information related to the items in the playlist of this session. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Array<AVQueueItem>	Items in the queue.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

try {
  let currentQueueItems: Array<avsession.AVQueueItem> = avsessionController.getAVQueueItemsSync();
} catch (err: BusinessError) {
  console.info(`getAVQueueItemsSync error, error code: ${err.code}, error message: ${err.message}`);
}

getOutputDeviceSync¹⁰⁺

getOutputDeviceSync(): OutputDeviceInfo

Obtains the output device information. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
OutputDeviceInfo	Information about the output device.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600103	The session controller does not exist.

Example

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

try {
  let currentOutputDevice: avSession.OutputDeviceInfo = avsessionController.getOutputDeviceSync();
} catch (err: BusinessError) {
  console.info(`getOutputDeviceSync error, error code: ${err.code}, error message: ${err.message}`);
}

isActiveSync¹⁰⁺

isActiveSync(): boolean

Checks whether the session is activated. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
boolean	Returns true is returned if the session is activated; returns false otherwise.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

try {
  let isActive: boolean = avsessionController.isActiveSync();
} catch (err: BusinessError) {
  console.info(`isActiveSync error, error code: ${err.code}, error message: ${err.message}`);
}

getValidCommandsSync¹⁰⁺

getValidCommandsSync(): Array<AVControlCommandType>

Obtains valid commands supported by the session. This API returns the result synchronously.

System capability: SystemCapability.Multimedia.AVSession.Core

Return value

Type	Description
Array<AVControlCommandType>	A set of valid commands.

Error codes

For details about the error codes, see AVSession Management Error Codes.

ID	Error Message
6600101	Session service exception.
6600102	The session does not exist.
6600103	The session controller does not exist.

Example

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

try {
  let validCommands: Array<avSession.AVControlCommandType> = avsessionController.getValidCommandsSync();
} catch (err: BusinessError) {
  console.info(`getValidCommandsSync error, error code: ${err.code}, error message: ${err.message}`);
}

AVControlCommandType¹⁰⁺

Enumerates the commands that can be sent to a session.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Description
play	string	Play the media.
pause	string	Pause the playback.
stop	string	Stop the playback.
playNext	string	Play the next media asset.
playPrevious	string	Play the previous media asset.
fastForward	string	Fast-forward.
rewind	string	Rewind.
seek	string	Seek to a playback position.
setSpeed	string	Set the playback speed.
setLoopMode	string	Set the loop mode.
toggleFavorite	string	Favorite the media asset.

AVControlCommand¹⁰⁺

Describes the command that can be sent to the session.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Type	Mandatory	Description
command	AVControlCommandType	Yes	Command.
parameter	LoopMode | string | number	No	Parameters carried in the command.

AVSessionErrorCode¹⁰⁺

Enumerates the error codes used in the media session.

System capability: SystemCapability.Multimedia.AVSession.Core

Name	Value	Description
ERR_CODE_SERVICE_EXCEPTION	6600101	Session service exception.
ERR_CODE_SESSION_NOT_EXIST	6600102	The session does not exist.
ERR_CODE_CONTROLLER_NOT_EXIST	6600103	The session controller does not exist.
ERR_CODE_REMOTE_CONNECTION_ERR	6600104	The remote session connection failed.
ERR_CODE_COMMAND_INVALID	6600105	Invalid session command.
ERR_CODE_SESSION_INACTIVE	6600106	The session is not activated.
ERR_CODE_MESSAGE_OVERLOAD	6600107	Too many commands or events.
ERR_CODE_DEVICE_CONNECTION_FAILED	6600108	Device connecting failed.
ERR_CODE_REMOTE_CONNECTION_NOT_EXIST	6600109	The remote connection is not established.

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