To enable LVB porn detection, you need to enable LVB screencapturing first either in the LVB Console or through API. This document describes how to implement LVB porn detection through API.

Enabling LVB Porn Detection

As the LVB porn detection feature is based on the LVB screencapturing feature, you have to enable LVB screencapturing first before you can enable LVB porn detection. The steps are as follows:

1. Create a porn detection-enabled LVB screencapturing template

Call CreateLiveSnapshotTemplate and set PornFlag to 1 to create a porn detection-enabled LVB screencapturing template.

2. Create a porn detection-enabled LVB screencapturing rule

Call CreateLiveSnapshotRule to create a porn detection-enabled LVB screencapturing rule and associate the LVB screencapturing template ID created in step 1 to the AppID, DomainName, AppName, and StreamName of the live stream that needs to undergo porn detection.

3. Start a live streaming and start porn detection

After a porn detection-enabled LVB screencapturing rule is created, the porn detection feature will be automatically enabled for new live streaming. If you want to enable porn detection for a live streaming that is in progress, you need to stop and restart the streaming for the feature to take effect.

Getting LVB Porn Detection Result

After LVB porn detection is enabled, you can configure the registered callback domain name in the porn detection callback template to have the LVB backend call back the porn detection result.

By default, only suspicious results will be called back.

The steps are as follows:

1. Create an LVB porn detection callback template

Call CreateLiveCallbackTemplate and set PornCensorshipNotifyUrl to your domain name to create an LVB porn detection callback template.

2. Create an LVB porn detection callback rule

Call CreateLiveCallbackRule to create a porn detection-enabled LVB screencapturing rule and associate the LVB screencapturing template ID created in the previous step to the AppId, DomainName, and AppName of the live streaming that needs to undergo porn detection.

3. Get the porn detection result

The LVB backend sends the porn detection result to your registered domain name through an HTTP POST request where the result is stored in the HTTP body in JSON format. You can determine whether the live streaming is pornographic by the type field alone.

It is recommended to use the type of an image to judge whether it is pornographic. As the detection system cannot achieve 100% accuracy, there may be false positives or false negatives, and human confirmation is recommended.

The complete protocol is as follows:

AbductionRisk description

faceDetail description

gameDetails description

gameList

In addition, the HTTP header contains the TPD-SecretID and TPD-CallBack-Auth fields which can be used for user authentication.
Signature calculation: Signature = base64_encode(hash_hmac('SHA1', $Body, $SecretKey, true)), where SecretKey is the SecretKey corresponding to the SecretId.

Below is a sample request:
HTTP Header:

TPD-SecretID : SecretId

TPD-CallBack-Auth: Signature

TPD-CallBack-Version : version

HTTP Body:

{
    "ocrMsg":"",

    "type":[2],

    "confidence":0,

    "normalScore":2,

    "hotScore":97,

    "pornScore":0,

    "screenshotTime":1575513174,

    "level":0,

    "img":"http://test-10000.cos.ap-shanghai.myqcloud.com/2019-12-05/teststream-screenshot-10-32-54-960x540.jpg",

    "abductionRisk":[ ],

    "faceDetails":[ ],

    "sendTime":1575513176,

    "illegalScore":0,

    "polityScore":0,

    "similarScore":0,

    "terrorScore":0,

    "tid":20001,

    "streamId":"teststream",

    "channelId":"teststream",

    "stream_param":"txSecret=40f38f69f574fd51126c421a3d96c374&txTime=5DEBEC80",

    "app":"testlive.myqcloud.com",

    "appname":"live",

    "appid":10000
}  

Disabling LVB Porn Detection

LVB porn detection can be disabled by deleting the screencapturing rule or modifying the screencapturing template. Both deletion and modification are effective only for new live streaming. If you want to disable LVB porn detection for a live streaming that has already started, you have to stop and restart the stream.

1. Delete the porn detection-enabled screencapturing rule

Call DeleteLiveSnapshotRule to delete the corresponding LVB screencapturing rule under DomainName, AppName, and StreamName by template ID.

2. Delete or modify the porn detection-enabled screencapturing template

Call ModifyLiveSnapshotTemplate to set the porn detection flag of the LVB screencapturing template to 0.