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server/vendor/github.com/pion/sdp/v3/session_description.go

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+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sdp
+
+import (
+	"net/url"
+	"strconv"
+)
+
+// SessionDescription is a a well-defined format for conveying sufficient
+// information to discover and participate in a multimedia session.
+type SessionDescription struct {
+	// v=0
+	// https://tools.ietf.org/html/rfc4566#section-5.1
+	Version Version
+
+	// o=<username> <sess-id> <sess-version> <nettype> <addrtype> <unicast-address>
+	// https://tools.ietf.org/html/rfc4566#section-5.2
+	Origin Origin
+
+	// s=<session name>
+	// https://tools.ietf.org/html/rfc4566#section-5.3
+	SessionName SessionName
+
+	// i=<session description>
+	// https://tools.ietf.org/html/rfc4566#section-5.4
+	SessionInformation *Information
+
+	// u=<uri>
+	// https://tools.ietf.org/html/rfc4566#section-5.5
+	URI *url.URL
+
+	// e=<email-address>
+	// https://tools.ietf.org/html/rfc4566#section-5.6
+	EmailAddress *EmailAddress
+
+	// p=<phone-number>
+	// https://tools.ietf.org/html/rfc4566#section-5.6
+	PhoneNumber *PhoneNumber
+
+	// c=<nettype> <addrtype> <connection-address>
+	// https://tools.ietf.org/html/rfc4566#section-5.7
+	ConnectionInformation *ConnectionInformation
+
+	// b=<bwtype>:<bandwidth>
+	// https://tools.ietf.org/html/rfc4566#section-5.8
+	Bandwidth []Bandwidth
+
+	// https://tools.ietf.org/html/rfc4566#section-5.9
+	// https://tools.ietf.org/html/rfc4566#section-5.10
+	TimeDescriptions []TimeDescription
+
+	// z=<adjustment time> <offset> <adjustment time> <offset> ...
+	// https://tools.ietf.org/html/rfc4566#section-5.11
+	TimeZones []TimeZone
+
+	// k=<method>
+	// k=<method>:<encryption key>
+	// https://tools.ietf.org/html/rfc4566#section-5.12
+	EncryptionKey *EncryptionKey
+
+	// a=<attribute>
+	// a=<attribute>:<value>
+	// https://tools.ietf.org/html/rfc4566#section-5.13
+	Attributes []Attribute
+
+	// https://tools.ietf.org/html/rfc4566#section-5.14
+	MediaDescriptions []*MediaDescription
+}
+
+// Attribute returns the value of an attribute and if it exists
+func (s *SessionDescription) Attribute(key string) (string, bool) {
+	for _, a := range s.Attributes {
+		if a.Key == key {
+			return a.Value, true
+		}
+	}
+	return "", false
+}
+
+// Version describes the value provided by the "v=" field which gives
+// the version of the Session Description Protocol.
+type Version int
+
+func (v Version) String() string {
+	return stringFromMarshal(v.marshalInto, v.marshalSize)
+}
+
+func (v Version) marshalInto(b []byte) []byte {
+	return strconv.AppendInt(b, int64(v), 10)
+}
+
+func (v Version) marshalSize() (size int) {
+	return lenInt(int64(v))
+}
+
+// Origin defines the structure for the "o=" field which provides the
+// originator of the session plus a session identifier and version number.
+type Origin struct {
+	Username       string
+	SessionID      uint64
+	SessionVersion uint64
+	NetworkType    string
+	AddressType    string
+	UnicastAddress string
+}
+
+func (o Origin) String() string {
+	return stringFromMarshal(o.marshalInto, o.marshalSize)
+}
+
+func (o Origin) marshalInto(b []byte) []byte {
+	b = append(append(b, o.Username...), ' ')
+	b = append(strconv.AppendUint(b, o.SessionID, 10), ' ')
+	b = append(strconv.AppendUint(b, o.SessionVersion, 10), ' ')
+	b = append(append(b, o.NetworkType...), ' ')
+	b = append(append(b, o.AddressType...), ' ')
+	return append(b, o.UnicastAddress...)
+}
+
+func (o Origin) marshalSize() (size int) {
+	return len(o.Username) +
+		lenUint(o.SessionID) +
+		lenUint(o.SessionVersion) +
+		len(o.NetworkType) +
+		len(o.AddressType) +
+		len(o.UnicastAddress) +
+		5
+}
+
+// SessionName describes a structured representations for the "s=" field
+// and is the textual session name.
+type SessionName string
+
+func (s SessionName) String() string {
+	return stringFromMarshal(s.marshalInto, s.marshalSize)
+}
+
+func (s SessionName) marshalInto(b []byte) []byte {
+	return append(b, s...)
+}
+
+func (s SessionName) marshalSize() (size int) {
+	return len(s)
+}
+
+// EmailAddress describes a structured representations for the "e=" line
+// which specifies email contact information for the person responsible for
+// the conference.
+type EmailAddress string
+
+func (e EmailAddress) String() string {
+	return stringFromMarshal(e.marshalInto, e.marshalSize)
+}
+
+func (e EmailAddress) marshalInto(b []byte) []byte {
+	return append(b, e...)
+}
+
+func (e EmailAddress) marshalSize() (size int) {
+	return len(e)
+}
+
+// PhoneNumber describes a structured representations for the "p=" line
+// specify phone contact information for the person responsible for the
+// conference.
+type PhoneNumber string
+
+func (p PhoneNumber) String() string {
+	return stringFromMarshal(p.marshalInto, p.marshalSize)
+}
+
+func (p PhoneNumber) marshalInto(b []byte) []byte {
+	return append(b, p...)
+}
+
+func (p PhoneNumber) marshalSize() (size int) {
+	return len(p)
+}
+
+// TimeZone defines the structured object for "z=" line which describes
+// repeated sessions scheduling.
+type TimeZone struct {
+	AdjustmentTime uint64
+	Offset         int64
+}
+
+func (z TimeZone) String() string {
+	return stringFromMarshal(z.marshalInto, z.marshalSize)
+}
+
+func (z TimeZone) marshalInto(b []byte) []byte {
+	b = strconv.AppendUint(b, z.AdjustmentTime, 10)
+	b = append(b, ' ')
+	return strconv.AppendInt(b, z.Offset, 10)
+}
+
+func (z TimeZone) marshalSize() (size int) {
+	return lenUint(z.AdjustmentTime) + 1 + lenInt(z.Offset)
+}