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