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104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
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// SPDX-License-Identifier: MIT
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package webrtc
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import (
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"encoding/json"
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"strings"
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)
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// SDPType describes the type of an SessionDescription.
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type SDPType int
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const (
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// SDPTypeOffer indicates that a description MUST be treated as an SDP
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// offer.
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SDPTypeOffer SDPType = iota + 1
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// SDPTypePranswer indicates that a description MUST be treated as an
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// SDP answer, but not a final answer. A description used as an SDP
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// pranswer may be applied as a response to an SDP offer, or an update to
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// a previously sent SDP pranswer.
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SDPTypePranswer
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// SDPTypeAnswer indicates that a description MUST be treated as an SDP
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// final answer, and the offer-answer exchange MUST be considered complete.
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// A description used as an SDP answer may be applied as a response to an
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// SDP offer or as an update to a previously sent SDP pranswer.
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SDPTypeAnswer
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// SDPTypeRollback indicates that a description MUST be treated as
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// canceling the current SDP negotiation and moving the SDP offer and
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// answer back to what it was in the previous stable state. Note the
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// local or remote SDP descriptions in the previous stable state could be
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// null if there has not yet been a successful offer-answer negotiation.
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SDPTypeRollback
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)
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// This is done this way because of a linter.
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const (
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sdpTypeOfferStr = "offer"
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sdpTypePranswerStr = "pranswer"
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sdpTypeAnswerStr = "answer"
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sdpTypeRollbackStr = "rollback"
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)
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// NewSDPType creates an SDPType from a string
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func NewSDPType(raw string) SDPType {
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switch raw {
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case sdpTypeOfferStr:
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return SDPTypeOffer
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case sdpTypePranswerStr:
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return SDPTypePranswer
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case sdpTypeAnswerStr:
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return SDPTypeAnswer
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case sdpTypeRollbackStr:
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return SDPTypeRollback
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default:
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return SDPType(Unknown)
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}
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}
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func (t SDPType) String() string {
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switch t {
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case SDPTypeOffer:
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return sdpTypeOfferStr
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case SDPTypePranswer:
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return sdpTypePranswerStr
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case SDPTypeAnswer:
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return sdpTypeAnswerStr
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case SDPTypeRollback:
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return sdpTypeRollbackStr
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default:
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return ErrUnknownType.Error()
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}
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}
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// MarshalJSON enables JSON marshaling of a SDPType
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func (t SDPType) MarshalJSON() ([]byte, error) {
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return json.Marshal(t.String())
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}
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// UnmarshalJSON enables JSON unmarshaling of a SDPType
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func (t *SDPType) UnmarshalJSON(b []byte) error {
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var s string
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if err := json.Unmarshal(b, &s); err != nil {
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return err
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}
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switch strings.ToLower(s) {
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default:
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return ErrUnknownType
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case "offer":
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*t = SDPTypeOffer
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case "pranswer":
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*t = SDPTypePranswer
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case "answer":
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*t = SDPTypeAnswer
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case "rollback":
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*t = SDPTypeRollback
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}
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return nil
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}
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