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RFC2327 SDP会话描述协议详解

落鹤生 发布于 2009-12-02 17:22 点击:次 
对会话描述协议的讲解。主要是数据参数讲解
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对会话描述协议的讲解。主要是数据参数讲解。附件为中文版的PDF。

The purpose of SDP is to convey information about media streams in
multimedia sessions to allow the recipients of a session description
to participate in the session. SDP is primarily intended for use in
an internetwork, although it is sufficiently general that it can
describe conferences in other network environments.

A multimedia session, for these purposes, is defined as a set of
media streams that exist for some duration of time. Media streams
can be many-to-many. The times during which the session is active
need not be continuous.

Thus far, multicast based sessions on the Internet have differed from
many other forms of conferencing in that anyone receiving the traffic
can join the session (unless the session traffic is encrypted). In
such an environment, SDP serves two primary purposes. It is a means
to communicate the existence of a session, and is a means to convey
sufficient information to enable joining and participating in the
session. In a unicast environment, only the latter purpose is likely
to be relevant.

Thus SDP includes:

o Session name and purpose

o Time(s) the session is active

o The media comprising the session

o Information to receive those media (addresses, ports, formats and
so on)

As resources necessary to participate in a session may be limited,
some additional information may also be desirable:

o Information about the bandwidth to be used by the conference

o Contact information for the person responsible for the session

In general, SDP must convey sufficient information to be able to join
a session (with the possible exception of encryption keys) and to
announce the resources to be used to non-participants that may need
to know.

5.1. Media Information

SDP includes:
o The type of media (video, audio, etc)
o The transport protocol (RTP/UDP/IP, H.320, etc)
o The format of the media (H.261 video, MPEG video, etc)

For an IP multicast session, the following are also conveyed:
o Multicast address for media

o Transport Port for media

RFC2327 SDP会话描述协议 中文版

(秩名)
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