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75 lines
2.9 KiB
YAML
75 lines
2.9 KiB
YAML
1 year ago
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---
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type: object
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description: |
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Provides SDP negotiation semantics for media pause, hold/resume, ICE restarts
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and voice/video call up/downgrading. Clients should implement and honour hold
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functionality as per [WebRTC's recommendation](https://www.w3.org/TR/webrtc/#hold-functionality).
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If both the invite event and the accepted answer event have `version` equal
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to `"1"`, either party may send `m.call.negotiate` with a `description` field
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to offer new SDP to the other party. This event has `call_id` with the ID of
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the call and `party_id` equal to the client's party ID for that call. The
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caller ignores any negotiate events with `party_id` + `user_id` tuple not
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equal to that of the answer it accepted and the callee ignores any negotiate
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events with `party_id` + `user_id` tuple not equal to that of the caller.
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Clients should use the `party_id` field to ignore the remote echo of their
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own negotiate events.
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This has a `lifetime` field as in `m.call.invite`, after which the sender of
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the negotiate event should consider the negotiation failed (timed out) and
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the recipient should ignore it.
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The `description` field is the same as the `offer` field in `m.call.invite`
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and `answer` field in `m.call.answer` and is an `RTCSessionDescriptionInit`
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object as per https://www.w3.org/TR/webrtc/#dom-rtcsessiondescriptioninit.
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Once an `m.call.negotiate` event is received, the client must respond with
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another `m.call.negotiate` event, with the SDP answer (with `"type": "answer"`)
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in the `description` property.
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In the `m.call.invite` and `m.call.answer` events, the `offer` and `answer`
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fields respectively are objects of type `RTCSessionDescriptionInit`. Hence
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the `type` field, whilst redundant in these events, is included for ease of
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working with the WebRTC API and is mandatory. Receiving clients should not
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attempt to validate the `type` field, but simply pass the object into the
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WebRTC API.
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x-addedInMatrixVersion: "1.7"
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allOf:
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- "$ref": core-event-schema/room_event.yaml
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properties:
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content:
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type: object
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allOf:
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- "$ref": core-event-schema/call_event.yaml
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properties:
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offer:
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type: object
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title: Offer
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description: The session description object
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properties:
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type:
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type: string
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enum:
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- offer
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description: The type of session description.
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sdp:
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type: string
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description: The SDP text of the session description.
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required:
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- type
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- sdp
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lifetime:
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type: integer
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description: The time in milliseconds that the invite is valid for.
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Once the invite age exceeds this value, clients should discard it.
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They should also no longer show the call as awaiting an answer in the
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UI.
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required:
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- offer
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- lifetime
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type:
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type: string
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enum:
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- m.call.negotiate
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