diff --git a/api/@ohos.multimedia.avsession.d.ts b/api/@ohos.multimedia.avsession.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..ef501b18eab417634e401bb3f5529498528422f4
--- /dev/null
+++ b/api/@ohos.multimedia.avsession.d.ts
@@ -0,0 +1,996 @@
+/*
+* Copyright (c) 2022 Huawei Device Co., Ltd.
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import { AsyncCallback } from './basic';
+import { WantAgent } from '@ohos.wantAgent';
+import KeyEvent from './@ohos.multimodalInput.keyEvent';
+import { ElementName } from './bundle/elementName';
+import image from './@ohos.multimedia.image';
+import audio from './@ohos.multimedia.audio';
+
+/**
+ * @name avSession
+ * @syscap SystemCapability.Multimedia.AVSession.Core
+ * @import import avsession from '@ohos.multimedia.avsession';
+ * @since 9
+ */
+declare namespace avSession {
+  /**
+   * Create an AVSession instance. An ability can only create one AVSession
+   * @param context The context of application
+   * @param tag A user-defined name for this session
+   * @param type The type of session {@link AVSessionType}
+   * @param {AsyncCallback<AVSession>} [callback] - callback.
+   * @returns {void | Promise<AVSession>} no callback returns Promise otherwise returns void
+   * @throws {BusinessError} 401 - parameter check failed
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  function createAVSession(context: Context, tag: string, type: AVSessionType, callback: AsyncCallback<AVSession>): void;
+  function createAVSession(context: Context, tag: string, type: AVSessionType): Promise<AVSession>;
+
+  /**
+   * Get all avsession descriptors of the system
+   * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
+   * @returns The array of {@link AVSessionDescriptor}
+   * @throws {BusinessError} 201 - permission denied
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  function getAllSessionDescriptors(callback: AsyncCallback<Array<Readonly<AVSessionDescriptor>>>): void;
+  function getAllSessionDescriptors(): Promise<Array<Readonly<AVSessionDescriptor>>>;
+
+  /**
+   * Create an avsession controller
+   * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
+   * @param sessionId Specifies the sessionId to create the controller.
+   * If provided 'default', the system will create a default controller, Used to control the system default session
+   * @returns An instance of {@link AVSessionController}
+   * @throws {BusinessError} 201 - permission denied
+   * @throws {BusinessError} 401 - parameter check failed
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  function createController(sessionId: string, callback: AsyncCallback<AVSessionController>): void;
+  function createController(sessionId: string): Promise<AVSessionController>;
+
+  /**
+   * Cast Audio to the remote devices or cast back local device
+   * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
+   * @param audioDevices Specifies the audio devices to cast.
+   * @param sessionId Specifies the sessionId which to send to remote.
+   * 'all' means cast all the media audio of this device to remote.
+   * @throws {BusinessError} 201 - permission denied
+   * @throws {BusinessError} 401 - parameter check failed
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+   * @throws {BusinessError} {@link #ERR_CODE_REMOTE_CONNECTION_ERR} - remote connection error
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  function castAudio(session: SessionToken | 'all', audioDevices: Array<audio.AudioDeviceDescriptor>, callback: AsyncCallback<void>): void;
+  function castAudio(session: SessionToken | 'all', audioDevices: Array<audio.AudioDeviceDescriptor>): Promise<void>;
+
+  /**
+   * Session token. Used to judge the legitimacy of the session.
+   * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  interface SessionToken {
+    /**
+     * The unique session id of the avsession object
+     * @since 9
+     */
+    sessionId: string;
+    /**
+     * Process id of session
+     * @since 9
+     */
+    pid: number;
+    /**
+     * User id
+     * @since 9
+     */
+    uid: number;
+  }
+  /**
+   * Register or unregister system session changed callback
+   * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
+   * @param type Registration Type, session creation, deletion or top priority session changed
+   * @param callback Used to returns the descriptor of created or delete session
+   * @throws {BusinessError} 201 - permission denied
+   * @throws {BusinessError} 401 - parameter check failed
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  function on(type: 'sessionCreate' | 'sessionDestroy' | 'topSessionChange', callback: (session: AVSessionDescriptor) => void): void;
+  function off(type: 'sessionCreate' | 'sessionDestroy' | 'topSessionChange', callback?: (session: AVSessionDescriptor) => void): void;
+
+  /**
+   * Register or unregister Session service death callback, notifying the application to clean up resources.
+   * @param type Registration Type
+   * @param callback Used to handle the session service death event.
+   * @throws {BusinessError} 201 - permission denied
+   * @throws {BusinessError} 401 - packagearameter check failed
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  function on(type: 'sessionServiceDie', callback: () => void): void;
+  function off(type: 'sessionServiceDie', callback?: () => void): void;
+
+  /**
+   * Send system media key event.The system automatically selects the recipient.
+   * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
+   * @param event The key event to be send
+   * @throws {BusinessError} 201 - permission denied
+   * @throws {BusinessError} 401 - parameter check failed
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @throws {BusinessError} {@link #ERR_CODE_COMMAND_INVALID} - command not supported
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  function sendSystemAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void;
+  function sendSystemAVKeyEvent(event: KeyEvent): Promise<void>;
+
+  /**
+   * Send system control command.The system automatically selects the recipient.
+   * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
+   * @param command The command to be send. See {@link AVControlCommand}
+   * @throws {BusinessError} 201 - permission denied
+   * @throws {BusinessError} 401 - parameter check failed
+   * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+   * @throws {BusinessError} {@link #ERR_CODE_COMMAND_INVALID} - command not supported
+   * @throws {BusinessError} {@link #ERR_CODE_MESSAGE_OVERLOAD} - command or event overload
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  function sendSystemControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void;
+  function sendSystemControlCommand(command: AVControlCommand): Promise<void>;
+
+  /**
+   * session type.
+   */
+  type AVSessionType = 'audio' | 'video';
+  /**
+   * AVSession object.
+   * @interface AVSession
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  interface AVSession {
+    /**
+     * unique session Id
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    readonly sessionId: string;
+
+    /**
+     * Set the metadata of this session.
+     * In addition to the required properties, users can fill in partially supported properties
+     * @param data {@link AVMetadata}
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    setAVMetadata(data: AVMetadata, callback: AsyncCallback<void>): void;
+    setAVMetadata(data: AVMetadata): Promise<void>;
+
+    /**
+     * Set the playback state of this session.
+     * @param state {@link AVPlaybackState}
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    setAVPlaybackState(state: AVPlaybackState, callback: AsyncCallback<void>): void;
+    setAVPlaybackState(state: AVPlaybackState): Promise<void>;
+
+    /**
+     * Set the ability to start the session corresponding to
+     * @param ability The WantAgent for launch the ability
+     * @since 9
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     */
+    setLaunchAbility(ability: WantAgent, callback: AsyncCallback<void>): void;
+    setLaunchAbility(ability: WantAgent): Promise<void>;
+
+    /**
+     * Get the current session's own controller
+     * @returns The instance of {@link AVSessionController}
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    getController(callback: AsyncCallback<AVSessionController>): void;
+    getController(): Promise<AVSessionController>;
+
+    /**
+     * Get output device information
+     * @returns The instance of {@link OutputDeviceInfo}
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    getOutputDevice(callback: AsyncCallback<OutputDeviceInfo>): void;
+    getOutputDevice(): Promise<OutputDeviceInfo>;
+
+    /**
+     * Register or unregister playback command callback.
+     * As long as it is registered, it means that the ability supports this command.
+     * If you cancel the callback, you need to call off {@link off}
+     * When canceling the callback, need to update the supported commands list.
+     * Each playback command only supports registering one callback,
+     * and the new callback will replace the previous one.
+     * @param type Command to register.
+     * @param callback Used to handle callback commands
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'play' | 'pause' | 'stop' | 'playNext' | 'playPrevious' | 'fastForward' | 'rewind', callback: () => void): void;
+    off(type: 'play' | 'pause' | 'stop' | 'playNext' | 'playPrevious' | 'fastForward' | 'rewind', callback?: () => void): void;
+
+    /**
+     * Register or unregister seek command callback
+     * @param type Registration Type 'seek'
+     * @param callback Used to handle seek command.The callback provide the seek time(ms)
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'seek', callback: (time: number) => void): void;
+    off(type: 'seek', callback?: (time: number) => void): void;
+
+    /**
+     * Register or unregister setSpeed command callback
+     * @param type Registration Type 'setSpeed'
+     * @param callback Used to handle setSpeed command.The callback provide the speed value
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'setSpeed', callback: (speed: number) => void): void;
+    off(type: 'setSpeed', callback?: (speed: number) => void): void;
+
+    /**
+     * Register or unregister setLoopMode command callback
+     * @param type Registration Type 'setLoopMode'
+     * @param callback Used to handle setLoopMode command.The callback provide the {@link LoopMode}
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'setLoopMode', callback: (mode: LoopMode) => void): void;
+    off(type: 'setLoopMode', callback?: (mode: LoopMode) => void): void;
+
+    /**
+     * Register or unregister toggle favorite command callback
+     * @param type Registration Type 'toggleFavorite'
+     * @param callback Used to handle toggleFavorite command.The callback provide
+     * the assetId for which the favorite status needs to be switched.
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'toggleFavorite', callback: (assetId: string) => void): void;
+    off(type: 'toggleFavorite', callback?: (assetId: string) => void): void;
+
+    /**
+     * Register or unregister media key handling callback
+     * @param type Registration Type
+     * @param callback Used to handle key events.The callback provide the KeyEvent
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'handleKeyEvent', callback: (event: KeyEvent) => void): void;
+    off(type: 'handleKeyEvent', callback?: (event: KeyEvent) => void): void;
+
+    /**
+     * Register or unregister session output device change callback
+     * @param type Registration Type
+     * @param callback Used to handle output device changed.
+     * The callback provide the new device info {@link OutputDeviceInfo}
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'outputDeviceChange', callback: (device: OutputDeviceInfo) => void): void;
+    off(type: 'outputDeviceChange', callback?: (device: OutputDeviceInfo) => void): void;
+
+    /**
+     * Activate the session, indicating that the session can accept control commands
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    activate(callback: AsyncCallback<void>): void;
+    activate(): Promise<void>;
+
+    /**
+     * Deactivate the session, indicating that the session not ready to accept control commands
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    deactivate(callback: AsyncCallback<void>): void;
+    deactivate(): Promise<void>;
+
+    /**
+     * Destroy this session, the server will clean up the session resources
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    destroy(callback: AsyncCallback<void>): void;
+    destroy(): Promise<void>;
+  }
+
+  /**
+   * The metadata of the current media.Used to set the properties of the current media file
+   * @interface AVMetadata
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  interface AVMetadata {
+    /**
+     * Unique ID used to represent this media.
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    assetId: string;
+    /**
+     * The title of this media, for display in media center.
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    title?: string;
+    /**
+     * The artist of this media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    artist?: string;
+    /**
+     * The author of this media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    author?: string;
+    /**
+     * The album of this media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    album?: string;
+    /**
+     * The writer of this media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    writer?: string;
+    /**
+     * The composer of this media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    composer?: string;
+    /**
+     * The duration of this media, used to automatically calculate playback position
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    duration?: number;
+    /**
+     * The image of the media as a {@link PixelMap} or an uri formatted String,
+     * used to display in media center.
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    mediaImage?: image.PixelMap | string;
+    /**
+     * The publishDate of the media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    publishDate?: Date;
+    /**
+     * The subtitle of the media, used for display
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    subtitle?: string;
+    /**
+     * The discription of the media, used for display
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    description?: string;
+    /**
+     * The lyric of the media, it should be in standard lyric format
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    lyric?: string;
+    /**
+     * The previous playable media id.
+     * Used to tell the controller if there is a previous playable media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    previousAssetId?: string;
+    /**
+     * The next playable media id.
+     * Used to tell the controller if there is a next playable media
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    nextAssetId?: string;
+  }
+
+  /**
+   * Used to indicate the playback state of the current media.
+   * If the playback state of the media changes, it needs to be updated synchronously
+   * @interface AVPlaybackState
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  interface AVPlaybackState {
+    /**
+     * Current playback state. See {@link PlaybackState}
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    state?: PlaybackState;
+    /**
+     * Current playback speed
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    speed?: number;
+    /**
+     * Current playback position of this media. See {@link PlaybackPosition}
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    position?: PlaybackPosition;
+    /**
+     * The current buffered time, the maximum playable position
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    bufferedTime?: number;
+    /**
+     * Current playback loop mode. See {@link LoopMode}
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    loopMode?: LoopMode;
+    /**
+     * Current Favorite Status
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    isFavorite?: boolean;
+  }
+
+  /**
+   * Playback position definition
+   * @interface PlaybackPosition
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  interface PlaybackPosition {
+    /**
+     * Elapsed time(position) of this media set by the app.
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    elapsedTime: number;
+    /**
+     * Record the system time when elapsedTime is set.
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    updateTime: number;
+  }
+  /**
+   * Target Device Information Definition
+   * @interface OutputDeviceInfo
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  interface OutputDeviceInfo {
+    /**
+     * Whether the remote device
+     * @since 9
+     */
+    isRemote: boolean;
+    /**
+     * Audio device id.The length of the audioDeviceId array is greater than 1
+     * if output to multiple devices at the same time.
+     * @since 9
+     */
+    audioDeviceId: Array<number>;
+    /**
+     * Device name. The length of the deviceName array is greater than 1
+     * if output to multiple devices at the same time.
+     * @since 9
+     */
+    deviceName: Array<string>;
+  }
+  /**
+   * Loop Play Mode Definition
+   * @enum {number}
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  enum LoopMode {
+    /**
+     * The default mode is sequential playback
+     * @since 9
+     */
+    LOOP_MODE_SEQUENCE = 0,
+
+    /**
+     * Single loop mode
+     * @since 9
+     */
+    LOOP_MODE_SINGLE = 1,
+
+    /**
+     * List loop mode
+     * @since 9
+     */
+    LOOP_MODE_LIST = 2,
+
+    /**
+     * Shuffle playback mode
+     * @since 9
+     */
+    LOOP_MODE_SHUFFLE = 3,
+  }
+
+  /**
+   * Definition of current playback state
+   * @enum {number}
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  enum PlaybackState {
+    /**
+     * Initial state. The initial state of media file
+     * @since 9
+     */
+    PLAYBACK_STATE_INITIAL = 0,
+
+    /**
+     * Preparing state. Indicates that the media file is not ready to play,
+     * the media is loading or buffering
+     * @since 9
+     */
+    PLAYBACK_STATE_PREPARE = 1,
+
+    /**
+     * Playing state.
+     * @since 9
+     */
+    PLAYBACK_STATE_PLAY = 2,
+
+    /**
+     * Paused state.
+     * @since 9
+     */
+    PLAYBACK_STATE_PAUSE = 3,
+
+    /**
+     * Fast forwarding state.
+     * @since 9
+     */
+    PLAYBACK_STATE_FAST_FORWARD = 4,
+
+    /**
+     * Rewinding state.
+     * @since 9
+     */
+    PLAYBACK_STATE_REWIND = 5,
+
+    /**
+     * Stopped state.The server will clear the media playback position and other information.
+     * @since 9
+     */
+    PLAYBACK_STATE_STOP = 6,
+  }
+
+  /**
+   * The description of the session
+   * @interface AVSessionDescriptor
+   * @syscap SystemCapability.Multimedia.AVSession.Manager
+   * @systemapi
+   * @since 9
+   */
+  interface AVSessionDescriptor {
+    /**
+     * Unique ID of the session
+     * @since 9
+     */
+    sessionId: string;
+    /**
+     * Session type, currently supports audio or video
+     * @since 9
+     */
+    type: AVSessionType;
+    /**
+     * The session tag set by the application
+     * @since 9
+     */
+    sessionTag: string;
+    /**
+     * The elementName of the ability that created this session. See {@link ElementName} in bundle/elementName.d.ts
+     * @since 9
+     */
+    elementName: ElementName;
+    /**
+     * Session active state
+     * @since 9
+     */
+    isActive: boolean;
+    /**
+     * Is it the top priority session
+     * @since 9
+     */
+    isTopSession: boolean;
+    /**
+     * The current output device information.
+     * It will be undefined if this is a local session.
+     * @since 9
+     */
+    outputDevice: OutputDeviceInfo;
+  }
+
+  /**
+   * Session controller,used to control media playback and get media information
+   * @interface AVSessionController
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  interface AVSessionController {
+    /**
+     * Unique session Id
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    readonly sessionId: string;
+    /**
+     * Get the playback status of the current session
+     * @returns AVPlaybackState {@link AVPlaybackState}
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    getAVPlaybackState(callback: AsyncCallback<AVPlaybackState>): void;
+    getAVPlaybackState(): Promise<AVPlaybackState>;
+
+    /**
+     * Get the metadata of the current session
+     * @returns AVMetadata {@link AVMetadata}
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    getAVMetadata(callback: AsyncCallback<AVMetadata>): void;
+    getAVMetadata(): Promise<AVMetadata>;
+
+    /**
+     * Get output device information
+     * @returns The instance of {@link OutputDeviceInfo}
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    getOutputDevice(callback: AsyncCallback<OutputDeviceInfo>): void;
+    getOutputDevice(): Promise<OutputDeviceInfo>;
+
+    /**
+     * Send media key event to this session
+     * @param event The KeyEvent
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_COMMAND_INVALID} - command not supported
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_INACTIVE} - session inactive
+     * @since 9
+     */
+    sendAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void;
+    sendAVKeyEvent(event: KeyEvent): Promise<void>;
+
+    /**
+     * Get the {@link WantAgent} of this session that can launch the session ability
+     * @returns WantAgent {@link WantAgent}
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    getLaunchAbility(callback: AsyncCallback<WantAgent>): void;
+    getLaunchAbility(): Promise<WantAgent>;
+
+    /**
+     * Get the adjusted playback position. The time automatically calculated by the system
+     * taking into account factors such as playback status, playback speed, and application update time.
+     * @returns current playback position in ms.Note that the returns value of each call will be different.
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    getRealPlaybackPositionSync(): number;
+
+    /**
+     * Check if the current session is active
+     * @returns the active state
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    isActive(callback: AsyncCallback<boolean>): void;
+    isActive(): Promise<boolean>;
+
+    /**
+     * Destroy the server controller
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    destroy(callback: AsyncCallback<void>): void;
+    destroy(): Promise<void>;
+
+    /**
+     * Get commands supported by the current session
+     * @returns An array of AVControlCommandType {@link AVControlCommandType}
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    getValidCommands(callback: AsyncCallback<Array<AVControlCommandType>>): void;
+    getValidCommands(): Promise<Array<AVControlCommandType>>;
+
+    /**
+     * Send control commands to this session
+     * @param command The command to be send. See {@link AVControlCommand}
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_NOT_EXIST} - session does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @throws {BusinessError} {@link #ERR_CODE_COMMAND_INVALID} - command not supported
+     * @throws {BusinessError} {@link #ERR_CODE_SESSION_INACTIVE} - session inactive
+     * @throws {BusinessError} {@link #ERR_CODE_MESSAGE_OVERLOAD} - command or event overload
+     * @since 9
+     */
+    sendControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void;
+    sendControlCommand(command: AVControlCommand): Promise<void>;
+
+    /**
+     * Register or unregister metadata changed callback
+     * @param type 'metadataChange'
+     * @param filter The properties of {@link AVMetadata} that you cared about
+     * @param callback The callback used to handle metadata changed event.
+     * The callback function provides the {@link AVMetadata} parameter.
+     * It only contains the properties set in the filter.
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    on(type: 'metadataChange', filter: Array<keyof AVMetadata> | 'all', callback: (data: AVMetadata) => void);
+    off(type: 'metadataChange', callback?: (data: AVMetadata) => void);
+
+    /**
+     * Register or unregister playback state changed callback
+     * @param type 'playbackStateChange'
+     * @param filter The properties of {@link AVPlaybackState} that you cared about
+     * @param callback The callback used to handle playback state changed event.
+     * The callback function provides the {@link AVPlaybackState} parameter.
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    on(type: 'playbackStateChange', filter: Array<keyof AVPlaybackState> | 'all', callback: (state: AVPlaybackState) => void);
+    off(type: 'playbackStateChange', callback?: (state: AVPlaybackState) => void);
+
+    /**
+     * Register or unregister current session destroyed callback
+     * @param type 'sessionDestroy'
+     * @param callback The callback used to handle current session destroyed event.
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    on(type: 'sessionDestroy', callback: () => void);
+    off(type: 'sessionDestroy', callback?: () => void);
+
+    /**
+     * Register or unregister the active state of this session changed callback
+     * @param type 'activeStateChange'
+     * @param callback The callback used to handle the active state of this session changed event.
+     * The callback function provides the changed session state.
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    on(type: 'activeStateChange', callback: (isActive: boolean) => void);
+    off(type: 'activeStateChange', callback?: (isActive: boolean) => void);
+
+    /**
+     * Register or unregister the valid commands of the session changed callback
+     * @param type 'validCommandChange'
+     * @param callback The callback used to handle the changes.
+     * The callback function provides an array of AVControlCommandType.
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @since 9
+     */
+    on(type: 'validCommandChange', callback: (commands: Array<AVControlCommandType>) => void);
+    off(type: 'validCommandChange', callback?: (commands: Array<AVControlCommandType>) => void);
+
+    /**
+     * Register or unregister session output device change callback
+     * @param type Registration Type
+     * @param callback Used to handle output device changed.
+     * The callback provide the new device info {@link OutputDeviceInfo}
+     * @throws {BusinessError} 401 - parameter check failed
+     * @throws {BusinessError} {@link #ERR_CODE_SERVICE_EXCEPTION} - server exception
+     * @throws {BusinessError} {@link #ERR_CODE_CONTROLLER_NOT_EXIST} - controller does not exist
+     * @syscap SystemCapability.Multimedia.AVSession.Core
+     * @since 9
+     */
+    on(type: 'outputDeviceChange', callback: (device: OutputDeviceInfo) => void): void;
+    off(type: 'outputDeviceChange', callback?: (device: OutputDeviceInfo) => void): void;
+  }
+
+  /**
+   * The type of control command
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  type AVControlCommandType = 'play' | 'pause' | 'stop' | 'playNext' | 'playPrevious' | 'fastForward' | 'rewind' |
+                              'seek' | 'setSpeed' | 'setLoopMode' | 'toggleFavorite';
+
+  /**
+   * The definition of command to be sent to the session
+   * @interface AVControlCommand
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  interface AVControlCommand {
+    /**
+     * The command value {@link AVControlCommandType}
+     * @since 9
+     */
+    command: AVControlCommandType;
+    /**
+     * parameter of the command. Whether this command requires parameters, see {@link AVSessionCommand}
+     * seek command requires a number parameter
+     * setSpeed command requires a number parameter
+     * setLoopMode command requires a {@link LoopMode} parameter.
+     * toggleFavorite command requires assetId {@link AVMetadata.assetId} parameter
+     * other commands need no parameter
+     * @since 9
+     */
+    parameter?: LoopMode | string | number;
+  }
+
+  /**
+   * Enumerates ErrorCode types, returns in BusinessError.code.
+   * @enum {number}
+   * @syscap SystemCapability.Multimedia.AVSession.Core
+   * @since 9
+   */
+  enum AVSessionErrorCode {
+    /**
+     * Server exception
+     * @since 9
+     */
+    ERR_CODE_SERVICE_EXCEPTION = 6600101,
+
+    /**
+     * The session does not exist
+     * @since 9
+     */
+    ERR_CODE_SESSION_NOT_EXIST = 6600102,
+
+    /**
+     * The controller does not exist
+     * @since 9
+     */
+    ERR_CODE_CONTROLLER_NOT_EXIST = 6600103,
+
+    /**
+     * Remote connection error
+     * @since 9
+     */
+    ERR_CODE_REMOTE_CONNECTION_ERR = 6600104,
+
+    /**
+     * Command not supported
+     * @since 9
+     */
+    ERR_CODE_COMMAND_INVALID = 6600105,
+
+    /**
+     * Session inactive
+     * @since 9
+     */
+    ERR_CODE_SESSION_INACTIVE = 6600106,
+
+    /**
+     * Command or event overload
+     * @since 9
+     */
+    ERR_CODE_MESSAGE_OVERLOAD = 6600107,
+  }
+}
+
+export default avSession;