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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)
}
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