@ohos.bluetooth.a2dp (Bluetooth A2DP Module) (System API)

The a2dp module provides APIs for using the Bluetooth Advanced Audio Distribution Profile (A2DP), which defines how to stream high quality audio from one device to another over a Bluetooth connection.

NOTE

The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version. This topic describes only the system APIs provided by the module. For details about its public APIs, see @ohos.bluetooth.a2dp (Bluetooth A2DP Module).

Modules to Import

import { a2dp } from '@kit.ConnectivityKit';

connect

connect(deviceId: string): void

Connects to an A2DP device.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to connect.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900004	Profile not supported.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.connect('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

disconnect

disconnect(deviceId: string): void

Disconnects from an A2DP device.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to connect.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900004	Profile not supported.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.disconnect('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

isAbsoluteVolumeSupported¹¹⁺

isAbsoluteVolumeSupported(deviceId: string, callback: AsyncCallback<boolean>): void

Checks whether a device supports the absolute volume capability. This API uses an asynchronous callback to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.
callback	AsyncCallback<boolean>	Yes	Callback used to return the result. If the device supports absolute volume, supported is returned.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.isAbsoluteVolumeSupported('XX:XX:XX:XX:XX:XX', (err, supported) => {
        console.info('device support absolute volume ' + supported);
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

isAbsoluteVolumeSupported¹¹⁺

isAbsoluteVolumeSupported(deviceId: string): Promise<boolean>

Checks whether a device supports the absolute volume capability. This API uses a promise to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.

Return value

Type	Description
Promise<boolean>	Promise used to return the result. If the device supports absolute volume, supported is returned.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.isAbsoluteVolumeSupported('XX:XX:XX:XX:XX:XX').then((supported) => {
        console.info('device support absolute volume ' + supported);
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

isAbsoluteVolumeEnabled¹¹⁺

isAbsoluteVolumeEnabled(deviceId: string, callback: AsyncCallback<boolean>): void

Checks whether the absolute volume capability is enabled for a device. Before using this API, use isAbsoluteVolumeSupported to check whether the device supports the absolute volume capability. This API uses an asynchronous callback to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.
callback	AsyncCallback<boolean>	Yes	Callback used to return the result. If absolute volume is enabled, enabled is returned.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.isAbsoluteVolumeEnabled('XX:XX:XX:XX:XX:XX', (err, enabled) => {
        console.info('device absolute volume enable ' + enabled);
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

isAbsoluteVolumeEnabled¹¹⁺

isAbsoluteVolumeEnabled(deviceId: string): Promise<boolean>

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.

Return value

Type	Description
Promise<boolean>	Promise used to return the result. If absolute volume is enabled, enabled is returned.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.isAbsoluteVolumeEnabled('XX:XX:XX:XX:XX:XX').then((enabled) => {
        console.info('device absolute volume enable ' + enabled);
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

enableAbsoluteVolume¹¹⁺

enableAbsoluteVolume(deviceId: string, callback: AsyncCallback<void>): void

Enables the absolute volume capability for a device. Before using this API, use isAbsoluteVolumeSupported to check whether the device supports the absolute volume capability. This API uses an asynchronous callback to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.enableAbsoluteVolume('XX:XX:XX:XX:XX:XX', (err) => {
        if (err) {
            console.error("enableAbsoluteVolume error");
        }
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

enableAbsoluteVolume¹¹⁺

enableAbsoluteVolume(deviceId: string): Promise<void>

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.enableAbsoluteVolume('XX:XX:XX:XX:XX:XX').then(() => {
            console.info("enableAbsoluteVolume");
        }
    );
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

disableAbsoluteVolume¹¹⁺

disableAbsoluteVolume(deviceId: string, callback: AsyncCallback<void>): void

Disables the absolute volume capability for a device. Before using this API, use isAbsoluteVolumeSupported to check whether the device supports the absolute volume capability. This API uses an asynchronous callback to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.disableAbsoluteVolume('XX:XX:XX:XX:XX:XX', (err) => {
        if (err) {
            console.error("disableAbsoluteVolume error");
        }
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

disableAbsoluteVolume¹¹⁺

disableAbsoluteVolume(deviceId: string): Promise<void>

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.disableAbsoluteVolume('XX:XX:XX:XX:XX:XX').then(() => {
        console.info("disableAbsoluteVolume");
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

getCurrentCodecInfo¹¹⁺

getCurrentCodecInfo(deviceId: string): CodecInfo

Obtains the current codec information.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the device to check.

Return value

Type	Description
CodecInfo	Codec information obtained.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    let codecInfo : a2dp.CodecInfo = a2dpSrc.getCurrentCodecInfo('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

setCurrentCodecInfo¹¹⁺

setCurrentCodecInfo(deviceId: string, codecInfo: CodecInfo): void

Sets the current codec information.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the target device.
codecInfo	CodecInfo	Yes	Codec information to set.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    let codecInfo : a2dp.CodecInfo = {
        codecType: 0,
        codecBitsPerSample: 1,
        codecChannelMode: 2,
        codecSampleRate: 1
    }
    a2dpSrc.setCurrentCodecInfo('XX:XX:XX:XX:XX:XX', codecInfo);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

disableAutoPlay¹²⁺

disableAutoPlay(deviceId: string, duration: number): Promise<void>

Disables auto play of music for the specified duration after a device is connected. This API uses a promise to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the remote device, for example, 11:22:33:AA:BB:FF.
duration	number	Yes	Duration for which auto play is disabled, in ms.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    let durationNumber = 1000;
    a2dpSrc.disableAutoPlay('XX:XX:XX:XX:XX:XX', durationNumber).then(() => {
        console.info("disableAutoPlay");
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

enableAutoPlay¹²⁺

enableAutoPlay(deviceId: string): Promise<void>

Enables auto play of music after a device is connected. This API uses a promise to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the remote device, for example, 11:22:33:AA:BB:FF.

Return value

Type	Description
Promise<void>	Promise used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.enableAutoPlay('XX:XX:XX:XX:XX:XX').then(() => {
        console.info("enableAutoPlay");
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

getAutoPlayDisabledDuration¹²⁺

getAutoPlayDisabledDuration(deviceId: string): Promise<number>

Obtains the auto-play disabled duration or auto play switch. This API uses a promise to return the result.

System API: This is a system API.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Name	Type	Mandatory	Description
deviceId	string	Yes	Address of the remote device, for example, 11:22:33:AA:BB:FF.

Return value

Type	Description
Promise<number>	Promise used to return the result. number indicates the duration for which auto play is disabled, in ms. If -1 is returned, the device is allowed to automatically play music after being connected.

Error codes

For details about the error codes, see Universal Error Codes and Bluetooth Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications are not allowed to use system APIs.
401	Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
801	Capability not supported.
2900001	Service stopped.
2900003	Bluetooth disabled.
2900099	Operation failed.

Example

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let a2dpSrc = a2dp.createA2dpSrcProfile();
    a2dpSrc.getAutoPlayDisabledDuration('XX:XX:XX:XX:XX:XX').then((data: number) => {
        console.info('number' + JSON.stringify(data));
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

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Modules to Import

connect

disconnect

isAbsoluteVolumeSupported¹¹⁺

isAbsoluteVolumeSupported¹¹⁺

isAbsoluteVolumeEnabled¹¹⁺

isAbsoluteVolumeEnabled¹¹⁺

enableAbsoluteVolume¹¹⁺

enableAbsoluteVolume¹¹⁺

disableAbsoluteVolume¹¹⁺

disableAbsoluteVolume¹¹⁺

getCurrentCodecInfo¹¹⁺

setCurrentCodecInfo¹¹⁺

disableAutoPlay¹²⁺

enableAutoPlay¹²⁺

getAutoPlayDisabledDuration¹²⁺

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@ohos.bluetooth.a2dp (Bluetooth A2DP Module) (System API)

Modules to Import

connect

disconnect

isAbsoluteVolumeSupported11+

isAbsoluteVolumeSupported11+

isAbsoluteVolumeEnabled11+

isAbsoluteVolumeEnabled11+

enableAbsoluteVolume11+

enableAbsoluteVolume11+

disableAbsoluteVolume11+

disableAbsoluteVolume11+

getCurrentCodecInfo11+

setCurrentCodecInfo11+

disableAutoPlay12+

enableAutoPlay12+

getAutoPlayDisabledDuration12+

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isAbsoluteVolumeSupported¹¹⁺

isAbsoluteVolumeSupported¹¹⁺

isAbsoluteVolumeEnabled¹¹⁺

isAbsoluteVolumeEnabled¹¹⁺

enableAbsoluteVolume¹¹⁺

enableAbsoluteVolume¹¹⁺

disableAbsoluteVolume¹¹⁺

disableAbsoluteVolume¹¹⁺

getCurrentCodecInfo¹¹⁺

setCurrentCodecInfo¹¹⁺

disableAutoPlay¹²⁺

enableAutoPlay¹²⁺

getAutoPlayDisabledDuration¹²⁺