# Managing External Storage Devices (Available Only for System Applications)
# Managing External Storage Devices (for System Applications Only)
External storage devices are pluggable. OpenHarmony provides the functions of listening for the device insertion and removal events and mounting/unmounting an external storage device.
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@@ -28,13 +28,13 @@ The following table describes the broadcast related parameters.
**Table 1** Broadcast parameters
| Broadcast| Parameter|
| Broadcast| Parameter|
| -------- | -------- |
| usual.event.data.VOLUME_REMOVED | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.|
| usual.event.data.VOLUME_UNMOUNTED | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.<br>**volumeState**: state of the volume.|
| usual.event.data.VOLUME_MOUNTED | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.<br>**volumeState**: state of the volume.<br>**fsUuid**: universally unique identifier (UUID) of the volume.<br>**path**: path where the volume is mounted.|
| usual.event.data.VOLUME_BAD_REMOVAL | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.|
| usual.event.data.VOLUME_EJECT | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.<br>**volumeState**: state of the volume.|
| usual.event.data.VOLUME_REMOVED | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.|
| usual.event.data.VOLUME_UNMOUNTED | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.<br>**volumeState**: state of the volume.|
| usual.event.data.VOLUME_MOUNTED | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.<br>**volumeState**: state of the volume.<br>**fsUuid**: universally unique identifier (UUID) of the volume.<br>**path**: path where the volume is mounted.|
| usual.event.data.VOLUME_BAD_REMOVAL | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.|
| usual.event.data.VOLUME_EJECT | **id**: ID of the volume.<br>**diskId**: ID of the disk to which the volume belongs.<br>**volumeState**: state of the volume.|
@@ -26,11 +26,7 @@ For details, see [AVSession Management](../reference/apis/js-apis-avsession.md).
| -------- | -------- |
| getAllSessionDescriptors(callback: AsyncCallback<Array<Readonly<AVSessionDescriptor>>>): void | Obtains the descriptors of all AVSessions in the system.|
| createController(sessionId: string, callback: AsyncCallback<AVSessionController>): void | Creates an AVSessionController.|
| getValidCommands(callback: AsyncCallback<Array<AVControlCommandType>>): void | Obtains valid commands supported by the AVSession.<br>Playback control commands listened by an audio and video application when it accesses the AVSession are considered as valid commands supported by the AVSession. For details, see [Provider of AVSession](using-avsession-developer.md).|
| getLaunchAbility(callback: AsyncCallback<WantAgent>): void | Obtains the UIAbility that is configured in the AVSession and can be started.<br>The UIAbility configured here is started when a user operates the UI of the controller, for example, clicking a widget in Media Controller.|
| sendAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void | Sends a key event to an AVSession through the AVSessionController object.|
| sendSystemAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void | Sends a key event to the top session.|
| sendControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void | Sends a playback control command to an AVSession through the AVSessionController object.|
| sendSystemControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void | Sends a playback control command to the top session.|
| getHistoricalSessionDescriptors(maxSize: number, callback: AsyncCallback\<Array\<Readonly\<AVSessionDescriptor>>>): void<sup>10+<sup> | Obtains the descriptors of historical sessions.|
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@@ -38,15 +34,15 @@ For details, see [AVSession Management](../reference/apis/js-apis-avsession.md).
| API| Description|
| -------- | -------- |
| getAVPlaybackState(callback: AsyncCallback<AVPlaybackState>): void | Obtains the information related to the playback state.|
| getAVMetadata(callback: AsyncCallback<AVMetadata>): void | Obtains the session metadata.|
| getOutputDevice(callback: AsyncCallback<OutputDeviceInfo>): void | Obtains the output device information.|
| sendAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void | Sends a key event to the session corresponding to this controller.|
| getLaunchAbility(callback: AsyncCallback<WantAgent>): void | Obtains the **WantAgent** object saved by the application in the session.|
| isActive(callback: AsyncCallback<boolean>): void | Checks whether the session is activated.|
| destroy(callback: AsyncCallback<void>): void | Destroys this controller. A controller can no longer be used after being destroyed.|
| getValidCommands(callback: AsyncCallback<Array<AVControlCommandType>>): void | Obtains valid commands supported by the session.|
| sendControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void | Sends a playback control command to the session through the controller.|
| getAVPlaybackState(callback: AsyncCallback<AVPlaybackState>): void<sup>10+<sup> | Obtains the information related to the playback state.|
| getAVMetadata(callback: AsyncCallback<AVMetadata>): void<sup>10+<sup> | Obtains the session metadata.|
| getOutputDevice(callback: AsyncCallback<OutputDeviceInfo>): void<sup>10+<sup> | Obtains the output device information.|
| sendAVKeyEvent(event: KeyEvent, callback: AsyncCallback<void>): void<sup>10+<sup> | Sends a key event to the session corresponding to this controller.|
| getLaunchAbility(callback: AsyncCallback<WantAgent>): void<sup>10+<sup> | Obtains the **WantAgent** object saved by the application in the session.|
| isActive(callback: AsyncCallback<boolean>): void<sup>10+<sup> | Checks whether the session is activated.|
| destroy(callback: AsyncCallback<void>): void<sup>10+<sup> | Destroys this controller. A controller can no longer be used after being destroyed.|
| getValidCommands(callback: AsyncCallback<Array<AVControlCommandType>>): void<sup>10+<sup> | Obtains valid commands supported by the session.|
| sendControlCommand(command: AVControlCommand, callback: AsyncCallback<void>): void<sup>10+<sup> | Sends a playback control command to the session through the controller.|
| sendCommonCommand(command: string, args: {[key: string]: Object}, callback: AsyncCallback<void>): void<sup>10+<sup> | Sends a custom playback control command to the session through the controller.|
| getAVQueueItems(callback: AsyncCallback<Array<AVQueueItem>>): void<sup>10+<sup> | Obtains the information related to the items in the playlist.|
| getAVQueueTitle(callback: AsyncCallback<string>): void<sup>10+<sup> | Obtains the name of the playlist.|
@@ -16,15 +16,15 @@ For details, see [AVSession Management](../reference/apis/js-apis-avsession.md).
| API| Description|
| -------- | -------- |
| createAVSession(context: Context, tag: string, type: AVSessionType, callback: AsyncCallback<AVSession>): void | Creates an AVSession.<br>Only one AVSession can be created for a UIAbility.|
| setLaunchAbility(ability: WantAgent, callback: AsyncCallback<void>): void | Starts a UIAbility.|
| getController(callback: AsyncCallback<AVSessionController>): void | Obtains the controller of the AVSession.|
| getOutputDevice(callback: AsyncCallback<OutputDeviceInfo>): void | Obtains the output device information.|
| activate(callback: AsyncCallback<void>): void | Activates the AVSession.|
| deactivate(callback: AsyncCallback<void>): void | Deactivates this session.|
| destroy(callback: AsyncCallback<void>): void | Destroys the AVSession.|
| createAVSession(context: Context, tag: string, type: AVSessionType, callback: AsyncCallback<AVSession>): void<sup>10+<sup> | Creates an AVSession.<br>Only one AVSession can be created for a UIAbility.|
# Common Events of the Resource Scheduling Subsystem
This document lists the common system events provided by the resource scheduling subsystem to applications. Applications can use [APIs](../js-apis-commonEventManager.md) to subscribe to common system events.
# Common Events of the Resource Scheduler Subsystem
This document lists the common system events provided by the resource scheduler subsystem to applications. Applications can use [APIs](../js-apis-commonEventManager.md) to subscribe to common system events.
@@ -4,14 +4,12 @@ The **avSession** module provides APIs for media playback control so that applic
This module provides the following typical features related to media sessions:
-[AVSession](#avsession): used to set session metadata, playback state information, and more.
-[AVSessionController](#avsessioncontroller): used to obtain session IDs, send commands and events to sessions, and obtain the session metadata and playback state information.
-[AVSession](#avsession10): used to set session metadata, playback state information, and more.
-[AVSessionController](#avsessioncontroller10): used to obtain session IDs, send commands and events to sessions, and obtain the session metadata and playback state information.
> **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.
>
> All the APIs provided by this module are system APIs.
## Modules to Import
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@@ -19,7 +17,7 @@ This module provides the following typical features related to media sessions:
| Promise<[AVSession](#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.|
| Promise<[AVSession](#avsession10)\> | 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.|
| type | [AVSessionType](#avsessiontype) | Yes | Session type, which can be audio or video. |
| callback | AsyncCallback<[AVSession](#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.|
| type | [AVSessionType](#avsessiontype10) | Yes | Session type, which can be audio or video. |
| callback | AsyncCallback<[AVSession](#avsession10)\> | 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**
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@@ -316,7 +309,7 @@ Creates a session controller based on the session ID. Multiple session controlle
| Promise<[AVSessionController](#avsessioncontroller)\> | Promise used to return the session controller created, which can be used to obtain the session ID,<br>send commands and events to sessions, and obtain metadata and playback state information.|
| Promise<[AVSessionController](#avsessioncontroller10)\> | Promise used to return the session controller created, which can be used to obtain the session ID,<br>send commands and events to sessions, and obtain metadata and playback state information.|
**Error codes**
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@@ -369,7 +362,7 @@ Creates a session controller based on the session ID. Multiple session controlle
| callback | AsyncCallback<[AVSessionController](#avsessioncontroller)\> | Yes | Callback used to return the session controller created, which can be used to obtain the session ID,<br>send commands and events to sessions, and obtain metadata and playback state information.|
| callback | AsyncCallback<[AVSessionController](#avsessioncontroller10)\> | Yes | Callback used to return the session controller created, which can be used to obtain the session ID,<br>send commands and events to sessions, and obtain metadata and playback state information.|
**Error codes**
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@@ -777,7 +770,7 @@ Sends a system control command to the top session. This API uses a promise to re
| 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**
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@@ -878,17 +871,14 @@ avSession.sendSystemControlCommand(avcommand, function (err) {
});
```
## AVSession
## AVSession<sup>10+</sup>
An **AVSession** object is created by calling [avSession.createAVSession](#avsessioncreateavsession). The object enables you to obtain the session ID and set the metadata and playback state.
An **AVSession** object is created by calling [avSession.createAVSession](#avsessioncreateavsession10). The object enables you to obtain the session ID and set the metadata and playback state.
| data | [AVMetadata](#avmetadata) | Yes | Session metadata. |
| data | [AVMetadata](#avmetadata10) | 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**
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@@ -1010,7 +996,7 @@ session.setAVMetadata(metadata, function (err) {
| data | [AVPlaybackState](#avplaybackstate) | Yes | Information related to the session playback state.|
| data | [AVPlaybackState](#avplaybackstate10) | 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**
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@@ -1112,8 +1095,6 @@ Sets a playlist. This API uses a promise to return the result.
| type | string | Yes | Event type. The event **'setLoopMode'** is reported when the command for setting the loop mode is sent to the session.|
| callback | (mode: [LoopMode](#loopmode)) => void | Yes | Callback used for subscription. The **mode** parameter in the callback indicates the loop mode. |
| callback | (mode: [LoopMode](#loopmode10)) => void | Yes | Callback used for subscription. The **mode** parameter in the callback indicates the loop mode. |
| type | string | Yes | Event type. The event **'outputDeviceChange'** is reported when the output device changes.|
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo)) => void | Yes | Callback used for subscription. The **device** parameter in the callback indicates the output device information. |
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo10)) => void | Yes | Callback used for subscription. The **device** parameter in the callback indicates the output device information. |
**Error codes**
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@@ -2309,8 +2238,6 @@ Subscribes to custom control command changes.
| type | string | Yes | Event type. The value is fixed at **'setLoopMode'**.|
| callback | (mode: [LoopMode](#loopmode)) => void | No | Callback used for unsubscription. The **mode** parameter in the callback indicates the loop mode.<br>If the unsubscription is successful, **err** is **undefined**; otherwise, **err** is an error object.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.|
| callback | (mode: [LoopMode](#loopmode10)) => void | No | Callback used for unsubscription. The **mode** parameter in the callback indicates the loop mode.<br>If the unsubscription is successful, **err** is **undefined**; otherwise, **err** is an error object.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session.|
**Error codes**
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@@ -2469,7 +2388,7 @@ For details about the error codes, see [AVSession Management Error Codes](../err
| type | string | Yes | Event type. The value is fixed at **'outputDeviceChange'**. |
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo)) => void | No | Callback used for unsubscription. The **device** parameter in the callback indicates the output device information.<br>If the unsubscription is successful, **err** is **undefined**; otherwise, **err** is an error object.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo10)) => void | No | Callback used for unsubscription. The **device** parameter in the callback indicates the output device information.<br>If the unsubscription is successful, **err** is **undefined**; otherwise, **err** is an error object.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
**Error codes**
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@@ -2606,8 +2517,6 @@ Unsubscribes from custom control command changes.
An AV session controller is created by calling [avSession.createController](#avsessioncreatecontroller). Through the AV session controller, you can query the session ID, send commands and events to a session, and obtain session metadata and playback state information.
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@@ -2639,9 +2548,6 @@ An AV session controller is created by calling [avSession.createController](#avs
| Promise<[WantAgent](js-apis-app-ability-wantAgent.md)\> | Promise used to return the object saved by calling [setLaunchAbility](#setlaunchability). The object includes the application attribute, such as the bundle name, ability name, and device ID.|
| Promise<[WantAgent](js-apis-app-ability-wantAgent.md)\> | Promise used to return the object saved by calling [setLaunchAbility](#setlaunchability10). The object includes the application attribute, such as the bundle name, ability name, and device ID.|
| callback | AsyncCallback<[WantAgent](js-apis-app-ability-wantAgent.md)\> | Yes | Callback used to return the object saved by calling [setLaunchAbility](#setlaunchability). The object includes the application attribute, such as the bundle name, ability name, and device ID.|
| callback | AsyncCallback<[WantAgent](js-apis-app-ability-wantAgent.md)\> | Yes | Callback used to return the object saved by calling [setLaunchAbility](#setlaunchability10). The object includes the application attribute, such as the bundle name, ability name, and device ID.|
@@ -3611,17 +3467,15 @@ Sends a control command to the session through the controller. This API uses a p
> **NOTE**
>
> Before using **sendControlCommand**, the controller must ensure that the AVSession has registered with the corresponding listener. For details about how to register the listener, see [Registering AVSession Listeners](#onplaypausestopplaynextplaypreviousfastforwardrewind).
> Before using **sendControlCommand**, the controller must ensure that the AVSession has registered with the corresponding listener. For details about how to register the listener, see [Registering AVSession Listeners](#onplaypausestopplaynextplaypreviousfastforwardrewind10).
@@ -3671,17 +3525,15 @@ Sends a control command to the session through the controller. This API uses an
> **NOTE**
>
> Before using **sendControlCommand**, the controller must ensure that the AVSession has registered with the corresponding listener. For details about how to register the listener, see [Registering AVSession Listeners](#onplaypausestopplaynextplaypreviousfastforwardrewind).
> Before using **sendControlCommand**, the controller must ensure that the AVSession has registered with the corresponding listener. For details about how to register the listener, see [Registering AVSession Listeners](#onplaypausestopplaynextplaypreviousfastforwardrewind10).
| command | [AVControlCommand](#avcontrolcommand) | Yes | Command to send.|
| command | [AVControlCommand](#avcontrolcommand10) | 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**
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@@ -3728,8 +3580,6 @@ Sends a custom control command to the session through the controller. This API u
@@ -3795,6 +3643,7 @@ Sends a custom control command to the session through the controller. This API u
> The **args** parameter supports the following data types: string, number, Boolean, object, array, and file descriptor. For details, see [@ohos.app.ability.Want(Want)](./js-apis-app-ability-want.md).
**Error codes**
For details about the error codes, see [AVSession Management Error Codes](../errorcodes/errorcode-avsession.md).
| type | string | Yes | Event type. The event **'metadataChange'** is reported when the session metadata changes.|
| filter | Array\<keyof [AVMetadata](#avmetadata)\> | 'all' | Yes | The value **'all'** indicates that any metadata field change will trigger the event, and **Array<keyof [AVMetadata](#avmetadata)\>** indicates that only changes to the listed metadata field will trigger the event.|
| callback | (data: [AVMetadata](#avmetadata)) => void | Yes | Callback used for subscription. The **data** parameter in the callback indicates the changed metadata. |
| filter | Array\<keyof [AVMetadata](#avmetadata10)\> | 'all' | Yes | The value **'all'** indicates that any metadata field change will trigger the event, and **Array<keyof [AVMetadata](#avmetadata10)\>** indicates that only changes to the listed metadata field will trigger the event.|
| callback | (data: [AVMetadata](#avmetadata10)) => void | Yes | Callback used for subscription. The **data** parameter in the callback indicates the changed metadata. |
| type | string | Yes | Event type. The event **'playbackStateChange'** is reported when the playback state changes.|
| filter | Array\<keyof [AVPlaybackState](#avplaybackstate)\> | 'all' | Yes | The value **'all'** indicates that any playback state field change will trigger the event, and **Array<keyof [AVPlaybackState](#avplaybackstate)\>** indicates that only changes to the listed playback state field will trigger the event.|
| callback | (state: [AVPlaybackState](#avplaybackstate)) => void | Yes | Callback used for subscription. The **state** parameter in the callback indicates the changed playback state. |
| filter | Array\<keyof [AVPlaybackState](#avplaybackstate10)\> | 'all' | Yes | The value **'all'** indicates that any playback state field change will trigger the event, and **Array<keyof [AVPlaybackState](#avplaybackstate10)\>** indicates that only changes to the listed playback state field will trigger the event.|
| callback | (state: [AVPlaybackState](#avplaybackstate10)) => void | Yes | Callback used for subscription. The **state** parameter in the callback indicates the changed playback state. |
**Error codes**
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@@ -3908,8 +3753,6 @@ Subscribes to session event changes. This API is called by the controller.
| type | string | Yes | Event type. The event **'validCommandChange'** is reported when the valid commands supported by the session changes.|
| callback | (commands: Array<[AVControlCommandType](#avcontrolcommandtype)\>) => void | Yes | Callback used for subscription. The **commands** parameter in the callback is a set of valid commands. |
| callback | (commands: Array<[AVControlCommandType](#avcontrolcommandtype10)\>) => void | Yes | Callback used for subscription. The **commands** parameter in the callback is a set of valid commands. |
| type | string | Yes | Event type. The event **'outputDeviceChange'** is reported when the output device changes.|
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo)) => void | Yes | Callback used for subscription. The **device** parameter in the callback indicates the output device information. |
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo10)) => void | Yes | Callback used for subscription. The **device** parameter in the callback indicates the output device information. |
| type | string | Yes | Event type. The event **'metadataChange'** is reported when the session metadata changes. |
| callback | (data: [AVMetadata](#avmetadata)) => void | No | Callback used for subscription. The **data** parameter in the callback indicates the changed metadata.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
| callback | (data: [AVMetadata](#avmetadata10)) => void | No | Callback used for subscription. The **data** parameter in the callback indicates the changed metadata.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
**Error codes**
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@@ -4205,7 +4032,7 @@ For details about the error codes, see [AVSession Management Error Codes](../err
| type | string | Yes | Event type. The event **'playbackStateChange'** is reported when the playback state changes. |
| callback | (state: [AVPlaybackState](#avplaybackstate)) => void | No | Callback used for subscription. The **state** parameter in the callback indicates the changed playback state.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
| callback | (state: [AVPlaybackState](#avplaybackstate10)) => void | No | Callback used for subscription. The **state** parameter in the callback indicates the changed playback state.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
**Error codes**
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@@ -4244,8 +4069,6 @@ Unsubscribes from session event changes. This API is called by the controller.
| type | string | Yes | Event type. The event **'validCommandChange'** is reported when the supported commands change. |
| callback | (commands: Array<[AVControlCommandType](#avcontrolcommandtype)\>) => void | No | Callback used for unsubscription. The **commands** parameter in the callback is a set of valid commands.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
| callback | (commands: Array<[AVControlCommandType](#avcontrolcommandtype10)\>) => void | No | Callback used for unsubscription. The **commands** parameter in the callback is a set of valid commands.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
**Error codes**
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@@ -4455,7 +4266,7 @@ For details about the error codes, see [AVSession Management Error Codes](../err
| type | string | Yes | Event type. The event **'outputDeviceChange'** is reported when the output device changes. |
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo)) => void | No | Callback used for unsubscription. The **device** parameter in the callback indicates the output device information.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
| callback | (device: [OutputDeviceInfo](#outputdeviceinfo10)) => void | No | Callback used for unsubscription. The **device** parameter in the callback indicates the output device information.<br>The **callback** parameter is optional. If it is not specified, all the subscriptions to the specified event are canceled for this session. |
**Error codes**
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@@ -4502,13 +4311,11 @@ Describes the information about a session token.
| pid | number | Yes | Process ID of the session.|
| uid | number | Yes | User ID. |
## AVSessionType
## AVSessionType<sup>10+<sup>
Enumerates the session types supported by the session.
| elementName | [ElementName](js-apis-bundle-ElementName.md) | 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](#outputdeviceinfo) | Yes | No | Information about the output device. |
| outputDevice | [OutputDeviceInfo](#outputdeviceinfo10) | Yes | No | Information about the output device. |
## AVControlCommandType
## AVControlCommandType<sup>10+</sup>
Enumerates the commands that can be sent to a session.
