Red5
Red5 Pro WebRTC SDK

The Red5 Pro WebRTC SDK is a JavaScript library for integrating low-latency live streaming publish and subscribe capabilities into web applications. It supports WHIP for WebRTC publishing and WHEP for WebRTC playback, enabling sub-second latency streaming directly in the browser without plugins. The SDK provides APIs for managing stream sessions, configuring media constraints, handling connection lifecycle events, and interacting with Stream Manager for scalable deployments.
Documentation GitHub
AsyncAPI Specification

asyncapi: 2.6.0
info:
  title: Red5 Pro WebRTC Streaming Events
  description: >-
    AsyncAPI specification for the Red5 Pro WebRTC streaming event system,
    covering WebSocket signaling messages exchanged during publish and subscribe
    sessions. Red5 Pro WebRTC uses WebSocket connections for signaling SDP
    offers, answers, and ICE candidates between clients and the streaming server.
    This specification documents the message types and payloads used in the
    WebRTC session lifecycle.
  version: '1.0'
  contact:
    name: Red5 Support
    url: https://www.red5.net/contact/
externalDocs:
  description: Red5 Pro WebRTC SDK Documentation
  url: https://www.red5.net/docs/red5-pro/development/sdks/red5-webrtc-sdk/
servers:
  red5ProServer:
    url: 'wss://{host}:443/live/{streamName}'
    protocol: wss
    description: >-
      Red5 Pro WebRTC WebSocket signaling endpoint for live streaming.
      Clients connect per-stream for publish or subscribe sessions.
    variables:
      host:
        description: Hostname or IP of the Red5 Pro server
        default: localhost
      streamName:
        description: Name of the stream to publish or subscribe to
        default: mystream
    security:
      - bearerToken: []
channels:
  /publish:
    description: >-
      WebSocket channel for a publisher to establish a WebRTC session and
      broadcast a live stream to the Red5 Pro server. The publisher sends
      an SDP offer and ICE candidates; the server responds with an SDP answer
      and its ICE candidates.
    publish:
      operationId: publisherSend
      summary: Publisher sends signaling message to server
      message:
        oneOf:
          - $ref: '#/components/messages/SdpOffer'
          - $ref: '#/components/messages/IceCandidate'
          - $ref: '#/components/messages/PublishRequest'
    subscribe:
      operationId: publisherReceive
      summary: Publisher receives signaling message from server
      message:
        oneOf:
          - $ref: '#/components/messages/SdpAnswer'
          - $ref: '#/components/messages/IceCandidate'
          - $ref: '#/components/messages/StreamEvent'
  /subscribe:
    description: >-
      WebSocket channel for a subscriber to establish a WebRTC session and
      receive a live stream from the Red5 Pro server. The subscriber sends
      an SDP offer and ICE candidates; the server responds with an SDP answer
      and its ICE candidates.
    publish:
      operationId: subscriberSend
      summary: Subscriber sends signaling message to server
      message:
        oneOf:
          - $ref: '#/components/messages/SdpOffer'
          - $ref: '#/components/messages/IceCandidate'
          - $ref: '#/components/messages/SubscribeRequest'
    subscribe:
      operationId: subscriberReceive
      summary: Subscriber receives signaling message from server
      message:
        oneOf:
          - $ref: '#/components/messages/SdpAnswer'
          - $ref: '#/components/messages/IceCandidate'
          - $ref: '#/components/messages/StreamEvent'
components:
  securitySchemes:
    bearerToken:
      type: http
      scheme: bearer
      description: JWT bearer token for authenticating WebSocket connections
  messages:
    PublishRequest:
      name: PublishRequest
      title: Publish Stream Request
      summary: Initial request from a publisher to start a streaming session
      description: >-
        Sent by a WebRTC publisher to initiate a broadcast session on the server.
        Contains the stream name and any authentication credentials.
      payload:
        $ref: '#/components/schemas/PublishRequestPayload'
    SubscribeRequest:
      name: SubscribeRequest
      title: Subscribe Stream Request
      summary: Initial request from a subscriber to join a streaming session
      description: >-
        Sent by a WebRTC subscriber to initiate playback of a live stream
        from the server. Contains the stream name to subscribe to.
      payload:
        $ref: '#/components/schemas/SubscribeRequestPayload'
    SdpOffer:
      name: SdpOffer
      title: SDP Offer
      summary: WebRTC SDP offer from a client
      description: >-
        Session Description Protocol (SDP) offer sent from a WebRTC client
        (publisher or subscriber) to the server to negotiate media capabilities
        and establish the peer connection.
      payload:
        $ref: '#/components/schemas/SdpPayload'
    SdpAnswer:
      name: SdpAnswer
      title: SDP Answer
      summary: WebRTC SDP answer from the server
      description: >-
        Session Description Protocol (SDP) answer sent from the Red5 Pro server
        in response to a client's SDP offer, completing the WebRTC negotiation.
      payload:
        $ref: '#/components/schemas/SdpPayload'
    IceCandidate:
      name: IceCandidate
      title: ICE Candidate
      summary: ICE candidate for WebRTC peer connection establishment
      description: >-
        Interactive Connectivity Establishment (ICE) candidate message exchanged
        between the client and server to discover and negotiate network paths
        for the WebRTC media connection.
      payload:
        $ref: '#/components/schemas/IceCandidatePayload'
    StreamEvent:
      name: StreamEvent
      title: Stream Lifecycle Event
      summary: Server-sent event about stream state changes
      description: >-
        Notification from the Red5 Pro server about changes in stream state,
        such as stream started, stopped, error conditions, or publisher disconnected.
      payload:
        $ref: '#/components/schemas/StreamEventPayload'
  schemas:
    PublishRequestPayload:
      type: object
      description: Payload for initiating a WebRTC publish session
      required:
        - type
        - streamName
      properties:
        type:
          type: string
          description: Message type identifier
          const: publishRequest
        streamName:
          type: string
          description: Name of the stream to publish
        username:
          type: string
          description: Publisher authentication username if required
        password:
          type: string
          description: Publisher authentication password if required
        record:
          type: boolean
          description: Whether to enable server-side recording of this stream
          default: false
    SubscribeRequestPayload:
      type: object
      description: Payload for initiating a WebRTC subscribe session
      required:
        - type
        - streamName
      properties:
        type:
          type: string
          description: Message type identifier
          const: subscribeRequest
        streamName:
          type: string
          description: Name of the stream to subscribe to
    SdpPayload:
      type: object
      description: WebRTC Session Description Protocol message payload
      required:
        - type
        - sdp
      properties:
        type:
          type: string
          description: SDP message type (offer or answer)
          enum:
            - offer
            - answer
        sdp:
          type: string
          description: SDP body string containing media negotiation details
    IceCandidatePayload:
      type: object
      description: WebRTC ICE candidate message payload
      required:
        - type
        - candidate
      properties:
        type:
          type: string
          description: Message type identifier
          const: iceCandidate
        candidate:
          type: string
          description: ICE candidate string in RFC 5245 format
        sdpMid:
          type: string
          description: Media stream identification tag this candidate is associated with
        sdpMLineIndex:
          type: integer
          description: Index of the media description in the SDP for this candidate
          minimum: 0
    StreamEventPayload:
      type: object
      description: Server-sent stream lifecycle event payload
      required:
        - type
        - code
      properties:
        type:
          type: string
          description: Message type identifier
          const: event
        code:
          type: string
          description: Event code identifying the stream state change
          enum:
            - NetStream.Play.Start
            - NetStream.Play.Stop
            - NetStream.Play.Failed
            - NetStream.Publish.Start
            - NetStream.Publish.BadName
            - NetStream.Unpublish.Success
            - NetConnection.Connect.Success
            - NetConnection.Connect.Failed
            - NetConnection.Connect.Closed
        level:
          type: string
          description: Event severity level
          enum:
            - status
            - warning
            - error
        description:
          type: string
          description: Human-readable description of the event
        streamName:
          type: string
          description: Name of the stream this event relates to
Red5 Pro WebRTC SDK

Documentation

Specifications

Other Resources

AsyncAPI Specification
