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<concept xml:lang="en" id="GUID-97ACFC53-4B55-5880-988D-7C376D8AFB16"><title>Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The Session Description Protocol (SDP) provides the users with a standard representation for media details, transport addresses, and session description metadata. This representation is independent of the method the information is transported. The SDP Codec subsystem enables its clients the SDP Codec API do the following: </p> <ul><li id="GUID-F23DAFF5-DEA1-5461-9D63-5DD2EB14B604"><p>encode SDP descriptions into an internal form </p> </li> <li id="GUID-4004AFE6-86E9-5B41-919A-44B28F0229FB"><p>decode the descriptions from an internal form </p> </li> <li id="GUID-5EB2D0EE-B445-55C1-B01F-0094191DF6DB"><p>set and get the SDP field values </p> </li> </ul> <section id="GUID-3391D293-B505-5A83-A65F-327EBB6DC8D1"><title>Architectural Relationships</title> <p>The calls to the SDP Codec API are synchronous. The SDP Codec API does not require capabilities and it cannot be extended. </p> </section> <section id="GUID-992D636B-1616-5406-9781-4AF7C5920E76"><title>SDP Codec API class structure</title> <p>The client uses some or all the <xref href="GUID-390AECC6-C8FF-34ED-8717-7BFCC4CF92BE.dita"><apiname>SDP Codec API</apiname></xref> classes during the handling of a SDP description. The interface classes are derived from <xref href="GUID-8F6FE089-E2A8-30F4-B67E-10F286347681.dita"><apiname>CBase</apiname></xref>. The client has a 'use' relationship with the SDP Codec API library. </p> <p>The following illustration shows the SDP Codec API class structure. </p> <fig id="GUID-32BE2AEF-3C5C-5A3E-9A3D-0A438C63AB90"><image href="GUID-51D6F328-82C4-5224-A51B-3EB9D4FF7B4C_d0e564283_href.png" placement="inline"/></fig> </section> <section id="GUID-43570589-DEDC-5C5C-B26B-E848E05DA782"><title>Memory used</title> <p>The amount of memory used by every header object of the SDP Codec API is equivalent to the memory used by the header as text. </p> </section> <section><title>See also</title> <ul><li id="GUID-A789B4B4-EBEC-5503-9F0F-B89243ACEB4B"><p> <xref scope="external" href="http://www.ietf.org/html.charters/mmusic-charter.html">Multiparty Multimedia Session Control (mmusic)</xref>  </p> </li> <li id="GUID-7F67EFC9-D5B5-5398-99BC-6FBBA06F63C3"><p> <xref scope="external" href="http://www.ietf.org/rfc/rfc2326.txt?number=2326"> Real Time Streaming Protocol (RTSP)</xref>  </p> </li> <li id="GUID-09246FFB-A8D0-59D6-9C70-31554115EDD2"><p> <xref scope="external" href="http://www.ietf.org/rfc/rfc3312.txt?number=3312">Integration of Resource Management and Session Initiation Protocol (SIP)</xref>  </p> </li> <li id="GUID-3CB30366-70AE-5EB6-A2C0-B1A56BAC4C5C"><p> <xref scope="external" href="http://www.ietf.org/rfc/rfc3388.txt?number=3388">Grouping of Media Lines in the Session Description Protocol (SDP)</xref>  </p> </li> <li id="GUID-5507546A-0BDB-5CB6-B9C3-A730E7D38875"><p> <xref scope="external" href="http://www.ietf.org/rfc/rfc3264.txt?number=3264">An Offer/Answer Model with the Session Description Protocol (SDP)</xref>  </p> </li> </ul> </section> </conbody></concept>