Class ExtMapAttribute

https://tools.ietf.org/html/rfc5285#section-5 Stream or media-level attribute used to indicate the presence of RTP Header Extensions, and the mapping of local identifiers used in the header extension to a larger namespace.

A usable mapping MUST use IDs in the valid range, and each ID in this range MUST be used only once for each media (or only once if the mappings are session level). Mappings that do not conform to these rules MAY be presented, for instance, during offer/answer negotiation as described in the next section, but remapping to conformant values is necessary before they can be applied.

Each extension is named by a URI. Each local identifier potentially used in the stream is mapped to a string using an attribute of the form: a=extmap:VALUE["/"DIRECTION] URI EXTENSIONATTRIBUTES Where URI is a URI, as above, VALUE is the local identifier (ID) of this extension and is an integer in the valid range inclusive (0 is reserved for padding in both forms, and 15 is reserved in the one-byte header form), and direction is one of "sendonly", "recvonly", "sendrecv", or "inactive" (without the quotes). Example:

a=extmap:1 http://example.com/082005/ext.htm#ttime a=extmap:2/sendrecv http://example.com/082005/ext.htm#xmeta short

Inheritance
System.Object
Attribute
ExtMapAttribute
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
Namespace: FM.LiveSwitch.Sdp.Rtp
Assembly: FM.LiveSwitch.dll
Syntax
public class ExtMapAttribute : Attribute

Constructors

ExtMapAttribute(Int32, String)

RTP Extension Map Attribute.

Declaration
public ExtMapAttribute(int id, string uri)
Parameters
Type Name Description
System.Int32 id

Local identifier of this extension and is an integer in the valid range inclusive (0 is reserved for padding in both forms, and 15 is reserved in the one-byte header form.
System.String uri

Well known extension identifier.

ExtMapAttribute(Int32, String, StreamDirection)

RTP Extension Map Attribute.

Declaration
public ExtMapAttribute(int id, string uri, StreamDirection direction)
Parameters
Type Name Description
System.Int32 id

Local identifier of this extension and is an integer in the valid range inclusive (0 is reserved for padding in both forms, and 15 is reserved in the one-byte header form.
System.String uri

Well known extension identifier.
StreamDirection direction

Disered direction of this RTP Extension Header.

Properties

Direction

Gets or sets the direction of this extension (optional). If not present, stream direction is assumed to be the direction of the extension.

Declaration
public StreamDirection Direction { get; set; }
Property Value
Type Description
StreamDirection

ExtensionAttributes

Gets or sets extension attributes (optional).

Declaration
public string ExtensionAttributes { get; set; }
Property Value
Type Description
System.String

Id

Gets or sets the local identifier of this extension.

Declaration
public int Id { get; set; }
Property Value
Type Description
System.Int32

Uri

Gets the well-known URI of this extension

Declaration
public string Uri { get; }
Property Value
Type Description
System.String

Methods

FromAttributeValue(String)

Initializes a new instance of the MapAttribute class.

Declaration
public static ExtMapAttribute FromAttributeValue(string value)
Parameters
Type Name Description
System.String value

The attribute value.
Returns
Type Description
ExtMapAttribute

GetAttributeValue()

Gets the internal value of the attribute.

Declaration
protected override string GetAttributeValue()
Returns
Type Description
System.String
Overrides