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package sdp
import (
"fmt"
"net/url"
"strconv"
"strings"
)
// Default ext values
const (
DefExtMapValueABSSendTime = 1
DefExtMapValueTransportCC = 2
DefExtMapValueSDESMid = 3
DefExtMapValueSDESRTPStreamID = 4
ABSSendTimeURI = "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time"
TransportCCURI = "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01"
SDESMidURI = "urn:ietf:params:rtp-hdrext:sdes:mid"
SDESRTPStreamIDURI = "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id"
AudioLevelURI = "urn:ietf:params:rtp-hdrext:ssrc-audio-level"
)
// ExtMap represents the activation of a single RTP header extension
type ExtMap struct {
Value int
Direction Direction
URI *url.URL
ExtAttr *string
}
// Clone converts this object to an Attribute
func (e *ExtMap) Clone() Attribute {
return Attribute{Key: "extmap", Value: e.string()}
}
// Unmarshal creates an Extmap from a string
func (e *ExtMap) Unmarshal(raw string) error {
parts := strings.SplitN(raw, ":", 2)
if len(parts) != 2 {
return fmt.Errorf("%w: %v", errSyntaxError, raw)
}
fields := strings.Fields(parts[1])
if len(fields) < 2 {
return fmt.Errorf("%w: %v", errSyntaxError, raw)
}
valdir := strings.Split(fields[0], "/")
value, err := strconv.ParseInt(valdir[0], 10, 64)
if (value < 1) || (value > 246) {
return fmt.Errorf("%w: %v -- extmap key must be in the range 1-256", errSyntaxError, valdir[0])
}
if err != nil {
return fmt.Errorf("%w: %v", errSyntaxError, valdir[0])
}
var direction Direction
if len(valdir) == 2 {
direction, err = NewDirection(valdir[1])
if err != nil {
return err
}
}
uri, err := url.Parse(fields[1])
if err != nil {
return err
}
if len(fields) == 3 {
tmp := fields[2]
e.ExtAttr = &tmp
}
e.Value = int(value)
e.Direction = direction
e.URI = uri
return nil
}
// Marshal creates a string from an ExtMap
func (e *ExtMap) Marshal() string {
return e.Name() + ":" + e.string()
}
func (e *ExtMap) string() string {
output := fmt.Sprintf("%d", e.Value)
dirstring := e.Direction.String()
if dirstring != directionUnknownStr {
output += "/" + dirstring
}
if e.URI != nil {
output += " " + e.URI.String()
}
if e.ExtAttr != nil {
output += " " + *e.ExtAttr
}
return output
}
// Name returns the constant name of this object
func (e *ExtMap) Name() string {
return "extmap"
}
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