Commit bd9b6e4e authored by lu_zero's avatar lu_zero

Updated document, will be sumbitted to ietf soon

svn path=/trunk/vorbis/; revision=12889
parent 7a047205
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AVT Working Group L. Barbato
Internet-Draft Xiph.Org
Expires: October 8, 2007 April 6, 2007
Expires: October 19, 2007 April 17, 2007
draft-ietf-avt-rtp-vorbis-02
draft-ietf-avt-rtp-vorbis-03
RTP Payload Format for Vorbis Encoded Audio
Status of this Memo
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The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on October 8, 2007.
This Internet-Draft will expire on October 19, 2007.
Copyright Notice
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Editors Note
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1. Introduction
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0 1 2 3
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Sequence number: 16 bits
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This field specifies the kind of Vorbis data stored in this RTP
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The payload packing of the Vorbis data packets MUST follow the
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Ident field followed by the one octet bitfield header, which has the
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that a change in the stream has taken place. The client application
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3.2.1. Packed Headers
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3.3. Loss of Configuration Headers
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5. Frame Packetization
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Packet 1:
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Packet 2:
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Packet 3:
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6. IANA Considerations
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Interoperability considerations:
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Type name: audio
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Restriction on usage:
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of the session reside.
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m=audio RTP/AVP 98
a=rtpmap:98 vorbis/44100/2
a=fmtp:98 delivery-method=in_band; configuration=base64string;
delivery-method=out_band/rtsp;
delivery-method=out_band;
configuration-uri=rtsp://path/to/the/resource; delivery-
method=out_band/http; configuration-uri=http://another/path/to/
method=out_band; configuration-uri=http://another/path/to/
resource/aggregate.bz2!8b6237eb5154a0ea12811a94e8e2697b3312bc6c;
Note that the payload format (encoding) names are commonly shown in
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7.2. Usage with the SDP Offer/Answer Model
The offer, as described in An Offer/Answer Model Session Description
Protocol [7], may contain a large number of delivery methods per
single fmtp attribute, the answerer MUST remove every delivery-method
and configuration-uri not supported. All the parameters MUST not be
altered on answer otherwise.
The only paramenter negotiable is the delivery method. All the
others are declarative: the offer, as described in An Offer/Answer
Model Session Description Protocol [7], may contain a large number of
delivery methods per single fmtp attribute, the answerer MUST remove
every delivery-method and configuration-uri not supported. All the
parameters MUST not be altered on answer otherwise.
8. Congestion Control
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Vorbis clients SHOULD send regular receiver reports detailing
congestion. A mechanism for dynamically downgrading the stream,
known as bitrate peeling, will allow for a graceful backing off of
the stream bitrate. This feature is not available at present so an
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the stream bitrate. This feature is not available at present so an
alternative would be to redirect the client to a lower bitrate stream
if one is available.
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10. Security Considerations
RTP packets using this payload format are subject to the security
considerations discussed in the RTP specification [2]. This implies
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considerations discussed in the RTP specification [2]. This implies
that the confidentiality of the media stream is achieved by using
encryption. Because the data compression used with this payload
format is applied end-to-end, encryption may be performed on the
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RFC 1981.
[7] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model with
Session Description Protocol (SDP)", RFC 3264.
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Session Description Protocol (SDP)", RFC 3264.
[8] Josefsson, S., "The Base16, Base32, and Base64 Data Encodings",
RFC 3548.
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Full Copyright Statement
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<rfc ipr="full3978" docName="RTP Payload Format for Vorbis Encoded Audio">
<front>
<title>draft-ietf-avt-rtp-vorbis-02</title>
<title>draft-ietf-avt-rtp-vorbis-03</title>
<author initials="L" surname="Barbato" fullname="Luca Barbato">
<organization>Xiph.Org</organization>
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</address>
</author>
<date day="6" month="April" year="2007" />
<date day="17" month="April" year="2007" />
<area>General</area>
<workgroup>AVT Working Group</workgroup>
......
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