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package sdp
import (
"strconv"
"strings"
)
// MediaDescription represents a media type.
// https://tools.ietf.org/html/rfc4566#section-5.14
type MediaDescription struct {
// m=<media> <port>/<number of ports> <proto> <fmt> ...
// https://tools.ietf.org/html/rfc4566#section-5.14
MediaName MediaName
// i=<session description>
// https://tools.ietf.org/html/rfc4566#section-5.4
MediaTitle *Information
// 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
// 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
}
// Attribute returns the value of an attribute and if it exists
func (d *MediaDescription) Attribute(key string) (string, bool) {
for _, a := range d.Attributes {
if a.Key == key {
return a.Value, true
}
}
return "", false
}
// RangedPort supports special format for the media field "m=" port value. If
// it may be necessary to specify multiple transport ports, the protocol allows
// to write it as: <port>/<number of ports> where number of ports is a an
// offsetting range.
type RangedPort struct {
Value int
Range *int
}
func (p *RangedPort) String() string {
output := strconv.Itoa(p.Value)
if p.Range != nil {
output += "/" + strconv.Itoa(*p.Range)
}
return output
}
// MediaName describes the "m=" field storage structure.
type MediaName struct {
Media string
Port RangedPort
Protos []string
Formats []string
}
func (m MediaName) String() string {
return strings.Join([]string{
m.Media,
m.Port.String(),
strings.Join(m.Protos, "/"),
strings.Join(m.Formats, " "),
}, " ")
}
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