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https://github.com/moparisthebest/xeps
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git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@1009 4b5297f7-1745-476d-ba37-a9c6900126ab
494 lines
24 KiB
XML
494 lines
24 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM 'xep.ent'>
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>Jingle Video via RTP</title>
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<abstract>This document defines methods for negotiating Jingle video sessions that use the Real-time Transport Protocol (RTP) for media exchange.</abstract>
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&LEGALNOTICE;
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<number>0180</number>
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<status>Experimental</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0166</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>TO BE ASSIGNED</shortname>
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&stpeter;
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<author>
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<firstname>Milton</firstname>
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<surname>Chen</surname>
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<email>Milton.Chen@vseelab.com</email>
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</author>
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<revision>
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<version>0.8</version>
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<date>2007-05-23</date>
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<initials>psa</initials>
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<remark><p>Corrected examples to use video codecs; added clockrate attribute.</p></remark>
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</revision>
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<revision>
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<version>0.7</version>
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<date>2007-05-23</date>
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<initials>psa</initials>
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<remark><p>More completely specified how to include SDP parameters and codec-specific parameters (same approach as in XEP-0167); added and corrected Theora examples.</p></remark>
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</revision>
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<revision>
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<version>0.6</version>
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<date>2007-04-17</date>
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<initials>psa</initials>
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<remark><p>Specified Jingle conformance, including the need to use a lossy transport and the process of sending and receiving video content.</p></remark>
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</revision>
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<revision>
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<version>0.5</version>
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<date>2007-03-23</date>
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<initials>psa</initials>
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<remark><p>Added negotiation flow and SDP mapping; renamed to mention RTP as the associated transport; corrected negotiation flow to be consistent with SIP/SDP (each party specifies a list of the payload types it can receive); added profile attribute to content element in order to specify RTP profile in use.</p></remark>
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</revision>
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<revision>
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<version>0.4</version>
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<date>2006-12-21</date>
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<initials>psa</initials>
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<remark><p>Modified spec to use provisional namespace before advancement to Draft (per XEP-0053).</p></remark>
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</revision>
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<revision>
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<version>0.3</version>
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<date>2006-08-23</date>
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<initials>psa</initials>
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<remark><p>Modified namespace to track XEP-0166.</p></remark>
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</revision>
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<revision>
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<version>0.2</version>
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<date>2006-07-12</date>
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<initials>psa</initials>
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<remark><p>Updated to use content type instead of media type.</p></remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2006-03-23</date>
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<initials>psa/mc</initials>
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<remark><p>Initial version.</p></remark>
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</revision>
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<revision>
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<version>0.0.1</version>
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<date>2006-03-20</date>
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<initials>psa/mc</initials>
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<remark><p>First draft.</p></remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<p>&xep0166; can be used to initiate and negotiate a wide range of peer-to-peer sessions. One session type of interest is video exchange. This document specifies a format for describing Jingle video sessions, where the media exchange occurs using the Real-time Transport Protocol (see &rfc3550;).</p>
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</section1>
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<section1 topic='Requirements' anchor='reqs'>
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<p>The Jingle content description format defined herein is designed to meet the following requirements:</p>
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<ol>
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<li>Enable negotiation of parameters necessary for video exchange.</li>
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<li>Map these parameters to the Session Description Protocol (SDP; see &rfc4566;) to enable interoperability.</li>
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<li>Define informational messages related to video chat.</li>
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</ol>
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</section1>
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<section1 topic='Jingle Conformance' anchor='conformance'>
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<p>In accordance with Section 8 of <cite>XEP-0166</cite>, this document specifies the following information related to the Jingle Video via RTP application type:</p>
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<ol>
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<li><p>The content negotiation process is defined in the <link url='#negotiation'>Negotiating a Jingle Video Session</link> section of this document.</p></li>
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<li><p>The semantics of the &DESCRIPTION; element are defined in the <link url='#format'>Content Description Format</link> section of this document.</p></li>
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<li><p>A mapping of Jingle semantics to the Session Description Protocol is provided in the <link url='#sdp'>Mapping to Session Description Protocol</link> section of this document.</p></li>
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<li><p>A Jingle video session MUST use a lossy transport method such as &xep0177; or the "ice-udp" method specified in &xep0176;.</p></li>
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<li>
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<p>Content is to be sent and received as follows:</p>
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<ul>
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<li><p>Outbound video content shall be encoded into RTP packets and each packet shall be sent individually over the transport. Each inbound packet received over the transport is an RTP packet.</p></li>
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</ul>
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</li>
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</ol>
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</section1>
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<section1 topic='Content Description Format' anchor='format'>
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<p>A Jingle video session is described by one or more encodings contained within a wrapper &DESCRIPTION; element qualified by the 'http://www.xmpp.org/extensions/xep-0180.html#ns' namespace &NSNOTE;. In the language of <cite>RFC 4566</cite> these encodings are payload-types; therefore, each <payload-type/> child element specifies an encoding that can be used for the video stream. Such encodings are often used in the context of the Real-time Transfer Protocol (RTP; see <cite>RFC 3550</cite>) but may be used in other contexts as well. The most common encodings for the Audio/Video Profile (AVP) of RTP are listed in &rfc3551; (these "static" types are reserved from payload ID 0 through payload ID 95), although other encodings are allowed in accordance with the dynamic assignment rules described in Section 3 of <cite>RFC 3551</cite> (these "dynamic" types use payload IDs 96 to 127). The &PAYLOADTYPE; element's 'id' attribute is REQUIRED and its 'name' attribute is RECOMMENDED. The encodings SHOULD be provided in order of preference.</p>
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<example caption="Video Description Format"><![CDATA[
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<description xmlns='http://www.xmpp.org/extensions/xep-0180.html#ns'>
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<payload-type id='96' name='theora' clockrate='90000' height='720' width='1280'>
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<parameter name='delivery-method' value='inline'/>
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<parameter name='configuration' value='somebase16string'/>
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<parameter name='sampling' value='YCbCr-4:2:2'/>
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</payload-type>
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<payload-type id='28' name='nv' clockrate='90000'/>
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<payload-type id='25' name='CelB' clockrate='90000'/>
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<payload-type id='32' name='MPV' clockrate='90000'/>
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</description>
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]]></example>
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<p>The &DESCRIPTION; element is intended to be a child of a &CONTENT; element as specified in <cite>XEP-0166</cite>.</p>
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<p>The defined attributes of the &PAYLOADTYPE; element are as follows:</p>
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<table caption='Video Description Attributes'>
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<tr>
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<th>Attribute</th>
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<th>Description</th>
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<th>Datatype/Units</th>
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<th>Inclusion</th>
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</tr>
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<tr>
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<td>channels</td>
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<td>The number of channels (e.g., 2 for stereoscopic video)</td>
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<td>positiveInteger (defaults to 1)</td>
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<td>OPTIONAL</td>
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</tr>
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<tr>
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<td>clockrate</td>
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<td>The sampling frequency in Hertz</td>
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<td>positiveInteger</td>
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<td>RECOMMENDED</td>
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</tr>
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<tr>
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<td>height</td>
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<td>The vertical extent of the displayed video, in pixels</td>
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<td>positiveInteger</td>
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<td>RECOMMENDED</td>
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</tr>
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<tr>
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<td>id</td>
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<td>A unique identifier for the payload type</td>
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<td>positiveInteger</td>
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<td>REQUIRED</td>
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</tr>
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<tr>
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<td>layer</td>
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<td>The relationship of a layer to the "bottom" of the stack, where 0 = bottom (the first layer)</td>
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<td>nonNegativeInteger</td>
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<td>OPTIONAL</td>
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</tr>
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<tr>
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<td>name</td>
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<td>A name for the payload type</td>
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<td>string</td>
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<td>RECOMMENDED for static payload types, REQUIRED for dynamic payload types</td>
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</tr>
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<tr>
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<td>transparent</td>
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<td>Whether or not a layer is transparent</td>
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<td>boolean</td>
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<td>OPTIONAL</td>
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</tr>
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<tr>
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<td>width</td>
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<td>The horizontal extent of the displayed video, in pixels</td>
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<td>positiveInteger</td>
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<td>RECOMMENDED</td>
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</tr>
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<tr>
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<td>x</td>
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<td>The horizontal starting point of a tile, in pixels from the origin point</td>
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<td>positiveInteger</td>
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<td>OPTIONAL</td>
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</tr>
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<tr>
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<td>y</td>
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<td>The vertical starting point of a tile, in pixels from the origin point</td>
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<td>positiveInteger</td>
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<td>OPTIONAL</td>
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</tr>
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</table>
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<p>Each <payload-type/> element MAY contain one or more child elements that specify particular parameters related to the payload. For example, as described in &rtptheora;, the "configuration", "configuration-uri", "delivery-method", and "sampling" parameters may be specified in relation to usage of the Theora <note>See <<link url='http://www.theora.org/'>http://www.theora.org/</link>>.</note> codec. Where such parameters are encoded via the "fmtp" SDP attribute, they shall be represented in Jingle via the following format, where the <parameter/> element is a child of the &PAYLOADTYPE; element:</p>
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<code><![CDATA[
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<parameter name='foo' value='bar'/>
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]]></code>
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<p>Note: The parameter names are effectively guaranteed to be unique, since &IANA; maintains a registry of SDP parameters (see <<link url='http://www.iana.org/assignments/sdp-parameters'>http://www.iana.org/assignments/sdp-parameters</link>>).</p>
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</section1>
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<section1 topic='Negotiating a Jingle Video Session' anchor='negotiation'>
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<p>When the initiator sends a session-initiate stanza to the receiver, the &DESCRIPTION; element includes all of the payload types that the initiator can receive for Jingle video (each one encapsulated in a separate &PAYLOADTYPE; element):</p>
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<example caption="Initiation Example"><![CDATA[
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<iq from='romeo@montague.net/orchard'
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to='juliet@capulet.com/balcony'
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id='jinglevideo1'
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type='set'>
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<jingle xmlns='http://www.xmpp.org/extensions/xep-0166.html#ns'>
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action='session-initiate'
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initiator='romeo@montague.net/orchard'
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sid='v1d30k1ll3dth3r4d10st4r'>
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<content content='initiator' name='this-is-the-video-content' profile='RTP/AVP'>
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<description xmlns='http://www.xmpp.org/extensions/xep-0167.html#ns'>
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<payload-type id='96' name='theora' clockrate='90000' height='720' width='1280'>
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<parameter name='delivery-method' value='inline'/>
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<parameter name='configuration' value='somebase16string'/>
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<parameter name='sampling' value='YCbCr-4:2:2'/>
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</payload-type>
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<payload-type id='28' name='nv' clockrate='90000'/>
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<payload-type id='25' name='CelB' clockrate='90000'/>
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<payload-type id='32' name='MPV' clockrate='90000'/>
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</description>
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<transport xmlns='http://www.xmpp.org/extensions/xep-0176.html#ns-udp'/>
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</content>
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</jingle>
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</iq>
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]]></example>
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<p>Upon receiving the session-initiate stanza, the receiver determines whether it can provisionally accept the session and proceed with the negotiation. The general Jingle error cases are specified in <cite>XEP-0166</cite>. In addition, the receiver must determine if it supports any of the payload types advertised by the initiator; if it does not, it MUST reject the session by sending a ¬acceptable; error, which SHOULD include a Jingle-specific error condition of <unsupported-codecs/>:</p>
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<example caption="Receiver Does Not Support Codecs"><![CDATA[
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<iq type='error'
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from='juliet@capulet.com/balcony'
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to='romeo@montague.net/orchard'
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id='jinglevideo1'>
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<error type='cancel'>
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<not-acceptable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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<unsupported-codecs xmlns='http://www.xmpp.org/extensions/xep-0180.html#ns-errors'/>
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</error>
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</iq>
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]]></example>
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<p>If there is no error, the receiver provisionally accepts the session:</p>
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<example caption="Receiver Provisionally Accepts Session"><![CDATA[
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<iq from='juliet@capulet.com/balcony'
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to='romeo@montague.net/orchard'
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id='jinglevideo1'
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type='result' />
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]]></example>
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<p>The receiver then should send a list of the payload types that it can receive via a Jingle "content-accept" (or "session-accept") action. The list that the receiver sends MAY include any payload types (not a subset of the payload types sent by the initiator) but SHOULD retain the ID numbers and order specified by the initiator.</p>
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<example caption="Receiver Accepts Content Type"><![CDATA[
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<iq from='juliet@capulet.com/balcony'
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to='romeo@montague.net/orchard'
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id='jinglevideo2'
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type='set'>
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<jingle xmlns='http://www.xmpp.org/extensions/xep-0166.html#ns'>
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action='content-accept'
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initiator='romeo@montague.net/orchard'
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sid='v1d30k1ll3dth3r4d10st4r'>
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<content content='initiator' name='this-is-the-video-content' profile='RTP/AVP'>
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<description xmlns='http://www.xmpp.org/extensions/xep-0167.html#ns'>
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<payload-type id='96' name='theora' height='720' width='1280'>
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<parameter name='delivery-method' value='inline'/>
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<parameter name='configuration' value='somebase16string'/>
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<parameter name='sampling' value='YCbCr-4:2:2'/>
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</payload-type>
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<payload-type id='32' name='MPV' clockrate='90000'/>
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<payload-type id='33' name='MP2T' clockrate='90000'/>
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</description>
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<transport xmlns='http://www.xmpp.org/extensions/xep-0176.html#ns-udp'/>
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</content>
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</jingle>
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</iq>
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]]></example>
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<p>The initiator acknowledges the 'content-accept' with an empty IQ result:</p>
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<example caption="Initiator Acknowledges Modified Content Description"><![CDATA[
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<iq from='romeo@montegue.net/orchard'
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to='juliet@capulet.com/balcony'
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id='jinglevideo2'
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type='result'/>
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]]></example>
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<p>After successful transport negotiation (not shown here), the receiver then accepts the session:</p>
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<example caption="Receiver Definitively Accepts the Session"><![CDATA[
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<iq type='set'
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from='juliet@capulet.com/balcony'
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to='romeo@montague.net/orchard'
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id='accept1'>
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<jingle xmlns='http://www.xmpp.org/extensions/xep-0166.html#ns'
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action='session-accept'
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initiator='romeo@montague.net/orchard'
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responder='juliet@capulet.com/balcony'
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sid='v1d30k1ll3dth3r4d10st4r'>
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<content creator='initiator' name='this-is-the-video-content' profile='RTP/AVP'>
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<description xmlns='http://www.xmpp.org/extensions/xep-0167.html#ns'/>
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<transport xmlns='http://www.xmpp.org/extensions/xep-0176.html#ns-udp'>
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<candidate component='2'
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foundation='1'
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generation='0'
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ip='192.0.2.3'
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network='1'
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port='45664'
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priority='1107821052'
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protocol='udp'
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pwd='asd88fgpdd777uzjYhagZg'
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type='srflx'
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ufrag='8hhy'/>
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</transport>
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</content>
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</jingle>
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</iq>
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]]></example>
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<p>And the initiator acknowledges session acceptance:</p>
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<example caption="Initiator Acknowledges Session Acceptance"><![CDATA[
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<iq from='romeo@montague.net/orchard'
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to='juliet@capulet.com/balcony'
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id='accept1'
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type='result' />
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]]></example>
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</section1>
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<section1 topic='Mapping to Session Description Protocol' anchor='sdp'>
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<p>If the payload type is static (payload-type IDs 0 through 95 inclusive), it MUST be mapped to a media field defined in <cite>RFC 4566</cite>. The generic format for the media field is as follows:</p>
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<code><![CDATA[
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m=<media> <port> <transport> <fmt list>
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]]></code>
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<p>In the context of Jingle video sessions, the <media> is "video", the <port> is the preferred port for such communications (which may be determined dynamically), the <transport> is whatever transport method is negotiated via the Jingle negotiation (e.g., "RTP/AVP"), and the <fmt list> is the payload-type ID.</p>
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<p>For example, consider the following static payload-type:</p>
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<example caption="Jingle Format for Static Payload-Type"><![CDATA[
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<payload-type id="28" name="nv"/>
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]]></example>
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<p>That Jingle-formatted information would be mapped to SDP as follows:</p>
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<example caption="SDP Mapping of Static Payload-Type"><![CDATA[
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m=video 9000 RTP/AVP 28
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]]></example>
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<p>If the payload type is dynamic (payload-type IDs 96 through 127 inclusive), it SHOULD be mapped to an SDP media field plus an SDP attribute field named "rtpmap".</p>
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<p>For example, consider a VC-1 payload such as that described in &rfc4425;:</p>
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<example caption="Jingle Format for Dynamic Payload-Type"><![CDATA[
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<payload-type id='98' name='vc1' height='288' width='352'/>
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]]></example>
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<p>That Jingle-formatted information would be mapped to SDP as follows:</p>
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<example caption="SDP Mapping of Dynamic Payload-Type"><![CDATA[
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m=video 49170 RTP/AVP 98
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a=rtpmap:98 vc1/90000
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a=fmtp:98 width=352;height=288;
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]]></example>
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<p>As noted, if additional parameters are to be specified, they shall be represented as attributes of the <payload-type/> element or its child <parameter/> element, as in the following example.</p>
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<example caption="Jingle Format for Dynamic Payload-Type With Parameters"><![CDATA[
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<payload-type id='96' name='theora' height='720' width='1280'>
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<parameter name='delivery-method' value='inline'/>
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<parameter name='configuration' value='somebase16string'/>
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<parameter name='sampling' value='YCbCr-4:2:2'/>
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</payload-type>
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]]></example>
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<p>That Jingle-formatted information would be mapped to SDP as follows:</p>
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<example caption="SDP Mapping of Dynamic Payload-Type With Parameters"><![CDATA[
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m=video 49170 RTP/AVP 98
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a=rtpmap:96 theora/90000
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a=fmtp:96 sampling=YCbCr-4:2:2; width=1280; height=720;
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delivery-method=inline; configuration=somebase16string;
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]]></example>
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</section1>
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<section1 topic='Determining Support' anchor='support'>
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<p>If an entity supports Jingle video exchanges via RTP, it MUST advertise that fact by returning a feature of "http://www.xmpp.org/extensions/xep-0180.html#ns" in response to &xep0030; information requests &NSNOTE;.</p>
|
|
<example caption="Service Discovery Information Request"><![CDATA[
|
|
<iq from='romeo@montague.net/orchard'
|
|
id='disco1'
|
|
to='juliet@capulet.com/balcony'
|
|
type='get'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'/>
|
|
</iq>
|
|
]]></example>
|
|
<example caption="Service Discovery Information Response"><![CDATA[
|
|
<iq from='juliet@capulet.com/balcony'
|
|
id='disco1'
|
|
to='romeo@montague.net/orchard'
|
|
type='result'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'>
|
|
...
|
|
<feature var='http://www.xmpp.org/extensions/xep-0166.html#ns'/>
|
|
<feature var='http://www.xmpp.org/extensions/xep-0180.html#ns'/>
|
|
...
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
</section1>
|
|
|
|
<section1 topic='Informational Messages' anchor='info'>
|
|
<p>Informational messages may be sent by either party within the context of Jingle to communicate the status of a Jingle video session, device, or principal. The informational message MUST be an IQ-set containing a &JINGLE; element of type "session-info". No informational message payload elements have yet been defined, but they may be specified in a future version of this document.</p>
|
|
</section1>
|
|
|
|
<section1 topic='Implementation Notes' anchor='impl'>
|
|
<section2 topic='Codecs' anchor='impl-codecs'>
|
|
<p>Support for the Theora codec is RECOMMENDED.</p>
|
|
</section2>
|
|
</section1>
|
|
|
|
<section1 topic='Security Considerations' anchor='security'>
|
|
<p>In order to secure the data stream, implementations SHOULD use encryption methods appropriate to the transport method and media being exchanged; for example, in the case of UDP, that would include Datagram Transport Layer Security (DTLS) as specified in &rfc4347;. &sdpdtls; defines such methods for the Session Description Protocol; the relevant RTP profile (e.g., "UDP/TLS/RTP/AVP" for transporting the RTP stream over DTLS with UDP) shall be specified as the value of the &CONTENT; element's 'profile' attribute.</p>
|
|
</section1>
|
|
|
|
<section1 topic='IANA Considerations' anchor='iana'>
|
|
<p>This document requires no interaction with &IANA;.</p>
|
|
</section1>
|
|
|
|
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
|
|
<section2 topic='Protocol Namespaces' anchor='ns'>
|
|
<p>Until this specification advances to a status of Draft, its associated namespaces shall be "http://www.xmpp.org/extensions/xep-0180.html#ns" and "http://www.xmpp.org/extensions/xep-0180.html#ns-errors"; upon advancement of this specification, the ®ISTRAR; shall issue permanent namespaces in accordance with the process defined in Section 4 of &xep0053;.</p>
|
|
</section2>
|
|
<section2 topic='Jingle Content Description Formats' anchor='registrar-content'>
|
|
<p>The XMPP Registrar shall include "video-rtp" in its registry of Jingle content description formats. The registry submission is as follows:</p>
|
|
<code><![CDATA[
|
|
<content>
|
|
<name>video-rtp</name>
|
|
<desc>Jingle sessions that support video exchange via the Real-time Transport Protocol</desc>
|
|
<transport>lossy</transport>
|
|
<doc>XEP-0180</doc>
|
|
</content>
|
|
]]></code>
|
|
</section2>
|
|
</section1>
|
|
|
|
<section1 topic='XML Schemas' anchor='schema'>
|
|
<section2 topic='Content Description Format' anchor='schema-content'>
|
|
<code><![CDATA[
|
|
<?xml version='1.0' encoding='UTF-8'?>
|
|
|
|
<xs:schema
|
|
xmlns:xs='http://www.w3.org/2001/XMLSchema'
|
|
targetNamespace='http://www.xmpp.org/extensions/xep-0180.html#ns'
|
|
xmlns='http://www.xmpp.org/extensions/xep-0180.html#ns'
|
|
elementFormDefault='qualified'>
|
|
|
|
<xs:element name='description'>
|
|
<xs:complexType>
|
|
<xs:sequence>
|
|
<xs:element ref='payload-type' minOccurs='0' maxOccurs='unbounded'/>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
|
|
<xs:element name='payload-type'>
|
|
<xs:complexType>
|
|
<xs:simpleContent>
|
|
<xs:extension base='empty'>
|
|
<xs:attribute name='channels' type='xs:integer' use='optional' default='1'/>
|
|
<xs:attribute name='height' type='xs:nonNegativeInteger' use='optional'/>
|
|
<xs:attribute name='id' type='xs:unsignedByte' use='required'/>
|
|
<xs:attribute name='layer' type='xs:nonNegativeInteger' use='optional'/>
|
|
<xs:attribute name='name' type='xs:string' use='optional'/>
|
|
<xs:attribute name='rate' type='xs:short' use='optional'/>
|
|
<xs:attribute name='transparent' type='xs:boolean' use='optional'/>
|
|
<xs:attribute name='width' type='xs:nonNegativeInteger' use='optional'/>
|
|
<xs:attribute name='x' type='xs:integer' use='optional'/>
|
|
<xs:attribute name='y' type='xs:integer' use='optional'/>
|
|
</xs:extension>
|
|
</xs:simpleContent>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
|
|
<xs:simpleType name='empty'>
|
|
<xs:restriction base='xs:string'>
|
|
<xs:enumeration value=''/>
|
|
</xs:restriction>
|
|
</xs:simpleType>
|
|
|
|
</xs:schema>
|
|
]]></code>
|
|
</section2>
|
|
<section2 topic='Errors' anchor='schema-errors'>
|
|
<code><![CDATA[
|
|
<?xml version='1.0' encoding='UTF-8'?>
|
|
|
|
<xs:schema
|
|
xmlns:xs='http://www.w3.org/2001/XMLSchema'
|
|
targetNamespace='http://www.xmpp.org/extensions/xep-0180.html#ns-errors'
|
|
xmlns='http://www.xmpp.org/extensions/xep-0180.html#ns-errors'
|
|
elementFormDefault='qualified'>
|
|
|
|
<xs:element name='unsupported-codecs' type='empty'/>
|
|
|
|
<xs:simpleType name='empty'>
|
|
<xs:restriction base='xs:string'>
|
|
<xs:enumeration value=''/>
|
|
</xs:restriction>
|
|
</xs:simpleType>
|
|
|
|
</xs:schema>
|
|
]]></code>
|
|
</section2>
|
|
</section1>
|
|
</xep>
|