# Alert ## Overview Alert is a module that can detect anomalies and patterns of interest in a stream or system and send notifications to users. Anomalies and patterns of interest can be set through predefined , and when detected, the module sends an HTTP(S) request to the user's notification server. ## Configuration Alert can be set up on ``, as shown below. ```xml http://192.168.0.161:9595/alert/notification 1234 3000 2000000 4000000 15 60 1280 720 1920 1080 16000 50400 ``` | Key | Description | | --------- | ------------------------------------------------------------------------------------------------------------------------ | | Url | The HTTP Server to receive the notification. HTTP and HTTPS are available. | | Secretkey |

The secret key used when encrypting with HMAC-SHA1
For more information, see Security.

| | Timeout | Time to wait for a response after request. (in milliseconds) | | Rules | Defines anomalies and patterns of interest to be detected. | ### Rules | Key | | Description | | ------- | -------------------- | ------------------------------------------------------------------------------------ | | Ingress | MinBitrate | Detects when the ingress stream's bitrate is lower than the set value. | | | MaxBitrate | Detects when the ingress stream's bitrate is greater than the set value. | | | MinFramerate | Detects when the ingress stream's framerate is lower than the set value. | | | MaxFramerate | Detects when the ingress stream's framerate is greater than the set value. | | | MinWidth | Detects when the ingress stream's width is lower than the set value. | | | MaxWidth | Detects when the ingress stream's width is greater than the set value. | | | MinHeight | Detects when the ingress stream's height is lower than the set value. | | | MaxHeight | Detects when the ingress stream's height is greater than the set value. | | | MinSamplerate | Detects when the ingress stream's samplerate is lower than the set value. | | | MaxSamplerate | Detects when the ingress stream's samplerate is greater than the set value. | | | LongKeyFrameInterval | Detects when the ingress stream's keyframe interval is too long (exceeds 4 seconds). | | | HasBFrames | Detects when there are B-frames in the ingress stream. | ## Notification ### Request #### Format ```http POST /configured/target/url HTTP/1.1 Content-Length: 1037 Content-Type: application/json Accept: application/json X-OME-Signature: f871jd991jj1929jsjd91pqa0amm1 { "sourceUri":"#default#app/stream", "messages":[ { "code":"INGRESS_HAS_BFRAME", "description":"There are B-Frames in the ingress stream." }, { "code":"INGRESS_BITRATE_LOW", "description":"The ingress stream's current bitrate (316228 bps) is lower than the configured bitrate (2000000 bps)" } ], "sourceInfo":{ "createdTime":"2023-04-07T21:15:24.487+09:00", "sourceType":"Rtmp", "sourceUrl":"TCP://192.168.0.220:10639", "tracks":[ { "id":0, "name":"Video", "type":"Video", "video":{ "bitrate":300000, "bypass":false, "codec":"H264", "framerate":30.0, "hasBframes":true, "height":1080, "keyFrameInterval":0, "width":1920 } }, { "audio":{ "bitrate":160000, "bypass":false, "channel":1, "codec":"AAC", "samplerate":48000 }, "id":1, "name":"Audio", "type":"Audio" }, { "id":2, "name":"Data", "type":"Data" } ] }, "type":"INGRESS" } ``` Here is a detailed explanation of each element of JSON payload: | Element | Description | | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | sourceUri |

URI information of the detected source.
INGRESS: #\#\/\

| | messages | List of messages detected by the Rules. | | sourceInfo | Detailed information about the source at the time of detection. It is identical to the response of the REST API's source information query for the detected source. | | type | It represents the format of the JSON payload. The information of the JSON elements can vary depending on the value of the type. | #### Messages | Type | Code | Description | | ------- | ----------------------------------- | -------------------------------------------------------------------------------------------------------------------------------- | | INGRESS | INGRESS\_BITRATE\_LOW | The ingress stream's current bitrate (`%d` bps) is lower than the configured bitrate (`%d` bps) | | | INGRESS\_BITRATE\_HIGH | The ingress stream's current bitrate (`%d` bps) is higher than the configured bitrate (`%d` bps) | | | INGRESS\_FRAMERATE\_LOW | The ingress stream's current framerate (`%.2f` fps) is lower than the configured framerate (`%.2f` fps) | | | INGRESS\_FRAMERATE\_HIGH | The ingress stream's current framerate (`%f` fps) is higher than the configured framerate (`%f` fps) | | | INGRESS\_WIDTH\_SMALL | The ingress stream's width (`%d`) is smaller than the configured width (`%d`) | | | INGRESS\_WIDTH\_LARGE | The ingress stream's width (`%d`) is larger than the configured width (`%d`) | | | INGRESS\_HEIGHT\_SMALL | The ingress stream's height (`%d`) is smaller than the configured height (`%d`) | | | INGRESS\_HEIGHT\_LARGE | The ingress stream's height (`%d`) is larger than the configured height (`%d`) | | | INGRESS\_SAMPLERATE\_LOW | The ingress stream's current samplerate (`%d`) is lower than the configured samplerate (`%d`) | | | INGRESS\_SAMPLERATE\_HIGH | The ingress stream's current samplerate (`%d`) is higher than the configured samplerate (`%d`) | | | INGRESS\_LONG\_KEY\_FRAME\_INTERVAL | The ingress stream's current keyframe interval (`%.1f` seconds) is too long. Please use a keyframe interval of 4 seconds or less | | | INGRESS\_HAS\_BFRAME | There are B-Frames in the ingress stream | #### Security The control server may need to validate incoming http requests for security reasons. To do this, the Alert module puts the `X-OME-Signature` value in the HTTP request header. `X-OME-Signature` is a base64 url safe encoded value obtained by encrypting the payload of an HTTP request with the HMAC-SHA1 algorithm using the secret key set in `` of the configuration. ### Response The engine in the closing state does not need any parameter in response. The response payload is ignored. ```http HTTP/1.1 200 OK Content-Length: 0 Connection: Closed ```