137 lines
3.1 KiB
Go
137 lines
3.1 KiB
Go
package sdp
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import (
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"strings"
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)
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// Marshal takes a SDP struct to text
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// https://tools.ietf.org/html/rfc4566#section-5
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// Session description
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// v= (protocol version)
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// o= (originator and session identifier)
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// s= (session name)
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// i=* (session information)
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// u=* (URI of description)
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// e=* (email address)
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// p=* (phone number)
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// c=* (connection information -- not required if included in
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// all media)
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// b=* (zero or more bandwidth information lines)
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// One or more time descriptions ("t=" and "r=" lines; see below)
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// z=* (time zone adjustments)
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// k=* (encryption key)
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// a=* (zero or more session attribute lines)
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// Zero or more media descriptions
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//
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// Time description
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// t= (time the session is active)
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// r=* (zero or more repeat times)
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//
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// Media description, if present
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// m= (media name and transport address)
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// i=* (media title)
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// c=* (connection information -- optional if included at
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// session level)
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// b=* (zero or more bandwidth information lines)
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// k=* (encryption key)
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// a=* (zero or more media attribute lines)
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func (s *SessionDescription) Marshal() ([]byte, error) {
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m := make(marshaller, 0, 1024)
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m.addKeyValue("v=", s.Version.String())
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m.addKeyValue("o=", s.Origin.String())
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m.addKeyValue("s=", s.SessionName.String())
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if s.SessionInformation != nil {
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m.addKeyValue("i=", s.SessionInformation.String())
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}
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if s.URI != nil {
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m.addKeyValue("u=", s.URI.String())
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}
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if s.EmailAddress != nil {
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m.addKeyValue("e=", s.EmailAddress.String())
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}
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if s.PhoneNumber != nil {
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m.addKeyValue("p=", s.PhoneNumber.String())
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}
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if s.ConnectionInformation != nil {
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m.addKeyValue("c=", s.ConnectionInformation.String())
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}
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for _, b := range s.Bandwidth {
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m.addKeyValue("b=", b.String())
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}
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for _, td := range s.TimeDescriptions {
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m.addKeyValue("t=", td.Timing.String())
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for _, r := range td.RepeatTimes {
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m.addKeyValue("r=", r.String())
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}
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}
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if len(s.TimeZones) > 0 {
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var b strings.Builder
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for i, z := range s.TimeZones {
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if i > 0 {
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b.WriteString(" ")
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}
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b.WriteString(z.String())
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}
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m.addKeyValue("z=", b.String())
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}
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if s.EncryptionKey != nil {
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m.addKeyValue("k=", s.EncryptionKey.String())
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}
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for _, a := range s.Attributes {
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m.addKeyValue("a=", a.String())
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}
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for _, md := range s.MediaDescriptions {
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m.addKeyValue("m=", md.MediaName.String())
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if md.MediaTitle != nil {
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m.addKeyValue("i=", md.MediaTitle.String())
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}
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if md.ConnectionInformation != nil {
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m.addKeyValue("c=", md.ConnectionInformation.String())
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}
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for _, b := range md.Bandwidth {
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m.addKeyValue("b=", b.String())
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}
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if md.EncryptionKey != nil {
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m.addKeyValue("k=", md.EncryptionKey.String())
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}
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for _, a := range md.Attributes {
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m.addKeyValue("a=", a.String())
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}
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}
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return m.bytes(), nil
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}
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// marshaller contains state during marshaling.
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type marshaller []byte
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func (m *marshaller) addKeyValue(key, value string) {
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if value == "" {
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return
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}
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*m = append(*m, key...)
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*m = append(*m, value...)
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*m = append(*m, "\r\n"...)
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}
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func (m *marshaller) bytes() []byte {
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return *m
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}
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