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RTP Payload Format for Vorbis Encoded Audio
Status of this Memo
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Editors Note
5.2. Packet Loss . . . . . . . . . . . . . . . . . . . . . . . 17
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
6.1. Mapping MIME Parameters into SDP . . . . . . . . . . . . . 19
- 6.2. Usage with the SDP Offer/Answer Model . . . . . . . . . . 20
+ 6.1.1. SDP Example . . . . . . . . . . . . . . . . . . . . . 20
+ 6.2. Usage with the SDP Offer/Answer Model . . . . . . . . . . 21
7. Congestion Control . . . . . . . . . . . . . . . . . . . . . . 21
8. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.1. Stream Radio . . . . . . . . . . . . . . . . . . . . . . . 21
9. Security Considerations . . . . . . . . . . . . . . . . . . . 22
10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 22
- 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 22
- 11.1. Normative References . . . . . . . . . . . . . . . . . . . 22
+ 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
+ 11.1. Normative References . . . . . . . . . . . . . . . . . . . 23
11.2. Informative References . . . . . . . . . . . . . . . . . . 23
- Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 24
- Intellectual Property and Copyright Statements . . . . . . . . . . 25
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+ Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 25
+ Intellectual Property and Copyright Statements . . . . . . . . . . 26
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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 sets the payload type for the Vorbis data in this RTP
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after the RTP packet header. Subsequence packets, if any, MUST
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prefixed by the two octet length field. The Packet Type and Fragment
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detects a change in the Ident value and does not have this
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0 1 2 3
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configuration data is via a retrieval method that can be performed
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MIME media type name: audio
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Restriction on usage:
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0 1 2 3
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packets MUST be the same as the first packet sent, with the sequence
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Packet 2:
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Packet 3:
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Loss of any of the Configuration fragment will result in the loss of
number, or aggregated in a single stream, aggregates MAY be
compressed using bzip2 [13] or gzip [11] and an sha1 [12]
checksum MAY be provided in the form of
- "protocol://path/to/resource/! sha1hash"
+ "protocol://path/to/resource/aggregated.bz2!sha1hash"
Encoding considerations:
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Published specification:
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o The MIME type ("audio") goes in SDP "m=" as the media name.
specified in the rtpmap attribute MUST match the Vorbis sample rate
value. An example is found below.
- c=IN IP4/6
+6.1.1. SDP Example
+
+ The following example shows a basic SDP single stream. The first
+ configuration packet is inlined in the sdp, other configurations
+ could be fetched at any time from the first provided uri using or all
+ the known configuration could be downloaded using the second uri.
+ The inline base16 [9] configuration string is omitted because of the
+ lenght.
+ c=IN IP4 192.0.0.1
m=audio RTP/AVP 98
- a=rtpmap:98 VORBIS/44100/2
+ a=rtpmap:98 vorbis/44100/2
a=delivery:out_band/http
- a=fmtp:98 delivery-method:in_band,out_band/http;
- configuration=base16string1;
- configuration-uri=http://path/to/the/resource
+ a=fmtp:98 delivery-method=in_band; configuration=base16string1;
+ delivery-method=out_band/rtsp;
+ configuration-uri=rtsp://path/to/the/resource; delivery-
+ method=out_band/http; configuration-uri=http://another/path/to/
+ resource/aggregate.bz2!sha1hash;
Note that the payload format (encoding) names are commonly shown in
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upper case. MIME subtypes are commonly shown in lower case. These
names are case-insensitive in both places. Similarly, parameter
names are case-insensitive both in MIME types and in the default
6.2. Usage with the SDP Offer/Answer Model
The offer, as described in An Offer/Answer Model Session Description
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Protocol [8], 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
listening to the content in a short time.
On join the client will receive the current Configuration necessary
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to decode the current stream inlined in the SDP so that the decoding
will start immediately after.
The client could choose to fetch the Configuration from the alternate
source as soon it discovers a Configuration packet got lost inline or
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use selective retransmission [17], if the server supports that
feature.
Hennequin, Ralph Giles, Tor-Einar Jarnbjo, Colin Law, John Lazzaro,
Jack Moffitt, Christopher Montgomery, Colin Perkins, Barry Short,
Mike Smith, Phil Kerr, Michael Sparks, Magnus Westerlund, David
- Barrett, Silvia Pfeiffer, Politecnico di Torino (LS)^3/IMG Group in
- particular Federico Ridolfo, Francesco Varano, Giampaolo Mancini,
- Juan Carlos De Martin.
+ Barrett, Silvia Pfeiffer, Stefan Ehmann. Politecnico di Torino
+ (LS)^3/IMG Group in particular Federico Ridolfo, Francesco Varano,
+ Giampaolo Mancini, Juan Carlos De Martin.
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11. References
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", RFC 2119.
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[3] Schulzrinne, H., Casner, S., Frederick, R., and V. Jacobson,
"RTP: A Transport Protocol for real-time applications",
RFC 3550.
[14] "libvorbis: Available from the Xiph website,
http://www.xiph.org".
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[15] "Ogg Vorbis I specification: Codec setup and packet decode.
Available from the Xiph website, http://www.xiph.org".
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Author's Address
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Intellectual Property Statement
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<rfc ipr="full3978" docName="RTP Payload Format for Vorbis Encoded Audio">
<front>
-<title>draft-kerr-avt-vorbis-rtp-05</title>
+<title>draft-kerr-avt-vorbis-rtp-06</title>
<author initials="L" surname="Barbato" fullname="Luca Barbato">
<organization>Xiph.Org</organization>
<vspace blankLines="1" />
<list style="hanging">
-<t hangText="configuration-uri:"> the URI of the configuration headers in case of out of band transmission. In the form of "protocol://path/to/resource/". Depending on the specific method the single ident packet could be retrived by their number, or aggregated in a single stream, aggregates MAY be compressed using <xref target="BZ2">bzip2</xref> or <xref target="rfc1952">gzip</xref> and an <xref target="FIPS180">sha1</xref> checksum MAY be provided in the form of "protocol://path/to/resource/! sha1hash"</t>
+<t hangText="configuration-uri:"> the URI of the configuration headers in case of out of band transmission. In the form of "protocol://path/to/resource/". Depending on the specific method the single ident packet could be retrived by their number, or aggregated in a single stream, aggregates MAY be compressed using <xref target="BZ2">bzip2</xref> or <xref target="rfc1952">gzip</xref> and an <xref target="FIPS180">sha1</xref> checksum MAY be provided in the form of "protocol://path/to/resource/aggregated.bz2!sha1hash"</t>
</list>
</t>
The port value is specified by the server application bound to the address specified in the c attribute. The bitrate value and channels specified in the rtpmap attribute MUST match the Vorbis sample rate value. An example is found below.
</t>
+<section anchor="SDP Example" title="SDP Example">
+<t>The following example shows a basic SDP single stream. The first configuration packet is inlined in the sdp, other configurations could be fetched at any time from the first provided uri using or all the known configuration could be downloaded using the second uri. The inline <xref target="rfc3548">base16</xref> configuration string is omitted because of the lenght.</t>
-<vspace blankLines="1" />
<list style="empty">
-<t>c=IN IP4/6 </t>
+<t>c=IN IP4 192.0.0.1</t>
<t>m=audio RTP/AVP 98</t>
-<t>a=rtpmap:98 VORBIS/44100/2</t>
+<t>a=rtpmap:98 vorbis/44100/2</t>
<t>a=delivery:out_band/http</t>
-<t>a=fmtp:98 delivery-method:in_band,out_band/http; configuration=base16string1; configuration-uri=http://path/to/the/resource</t>
+<t>a=fmtp:98 delivery-method=in_band; configuration=base16string1; delivery-method=out_band/rtsp; configuration-uri=rtsp://path/to/the/resource; delivery-method=out_band/http; configuration-uri=http://another/path/to/resource/aggregate.bz2!sha1hash;</t>
</list>
+</section>
+
<t>
Note that the payload format (encoding) names are commonly shown in upper case. MIME subtypes are commonly shown in lower case. These names are case-insensitive in both places. Similarly, parameter names are case-insensitive both in MIME types and in the default mapping to the SDP a=fmtp attribute. The exception regarding case sensitivity is the configuration-uri URI which MUST be regarded as being case sensitive.
</t>
<t>
-Thanks to the AVT, Ogg Vorbis Communities / Xiph.org including Steve Casner, Aaron Colwell, Ross Finlayson, Fluendo, Ramon Garcia, Pascal Hennequin, Ralph Giles, Tor-Einar Jarnbjo, Colin Law, John Lazzaro, Jack Moffitt, Christopher Montgomery, Colin Perkins, Barry Short, Mike Smith, Phil Kerr, Michael Sparks, Magnus Westerlund, David Barrett, Silvia Pfeiffer, Politecnico di Torino (LS)³/IMG Group in particular Federico Ridolfo, Francesco Varano, Giampaolo Mancini, Juan Carlos De Martin.
+Thanks to the AVT, Ogg Vorbis Communities / Xiph.org including Steve Casner, Aaron Colwell, Ross Finlayson, Fluendo, Ramon Garcia, Pascal Hennequin, Ralph Giles, Tor-Einar Jarnbjo, Colin Law, John Lazzaro, Jack Moffitt, Christopher Montgomery, Colin Perkins, Barry Short, Mike Smith, Phil Kerr, Michael Sparks, Magnus Westerlund, David Barrett, Silvia Pfeiffer, Stefan Ehmann. Politecnico di Torino (LS)³/IMG Group in particular Federico Ridolfo, Francesco Varano, Giampaolo Mancini, Juan Carlos De Martin.
</t>
</section>
projects / platform / upstream / libvorbis.git / commitdiff