rfc8830v3.txt   rfc8830.txt 
Internet Engineering Task Force (IETF) H. Alvestrand Internet Engineering Task Force (IETF) H. Alvestrand
Request for Comments: 8830 Google Request for Comments: 8830 Google
Category: Standards Track November 2020 Category: Standards Track January 2021
ISSN: 2070-1721 ISSN: 2070-1721
WebRTC MediaStream Identification in the Session Description Protocol WebRTC MediaStream Identification in the Session Description Protocol
Abstract Abstract
This document specifies a Session Description Protocol (SDP) grouping This document specifies a Session Description Protocol (SDP) grouping
mechanism for RTP media streams that can be used to specify relations mechanism for RTP media streams that can be used to specify relations
between media streams. between media streams.
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received public review and has been approved for publication by the received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841. Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata, Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8830. https://www.rfc-editor.org/info/rfc8830.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
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publication of this document. Please review these documents publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
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Specifications: ABNF", STD 68, RFC 5234, Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008, DOI 10.17487/RFC5234, January 2008,
<https://www.rfc-editor.org/info/rfc5234>. <https://www.rfc-editor.org/info/rfc5234>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8829] Uberti, J., Jennings, C., and E. Rescorla, Ed., [RFC8829] Uberti, J., Jennings, C., and E. Rescorla, Ed.,
"JavaScript Session Establishment Protocol (JSEP)", "JavaScript Session Establishment Protocol (JSEP)",
RFC 8829, DOI 10.17487/RFC8829, November 2020, RFC 8829, DOI 10.17487/RFC8829, January 2021,
<https://www.rfc-editor.org/info/rfc8829>. <https://www.rfc-editor.org/info/rfc8829>.
[RFC8859] Nandakumar, S., "A Framework for Session Description [RFC8859] Nandakumar, S., "A Framework for Session Description
Protocol (SDP) Attributes When Multiplexing", Protocol (SDP) Attributes When Multiplexing", RFC 8859,
DOI 10.17487/RFC8859, RFC 8859, November 2020, DOI 10.17487/RFC8859, January 2021,
<https://www.rfc-editor.org/info/rfc8859>. <https://www.rfc-editor.org/info/rfc8859>.
[W3C-WebRTC] [W3C-WebRTC]
Jennings, C., Boström, H., and J-I. Bruaroey, "WebRTC 1.0: Jennings, C., Boström, H., and J-I. Bruaroey, "WebRTC 1.0:
Real-time Communication Between Browsers", W3C Candidate Real-time Communication Between Browsers", W3C Proposed
Recommendation, <https://www.w3.org/TR/webrtc/>. Recommendation, <https://www.w3.org/TR/webrtc/>.
[W3C.CR-mediacapture-streams] [W3C.CR-mediacapture-streams]
Jennings, C., Aboba, B., Bruaroey, J.-I., and H. Boström, Jennings, C., Aboba, B., Bruaroey, J.-I., and H. Boström,
"Media Capture and Streams", W3C Candidate Recommendation, "Media Capture and Streams", W3C Candidate Recommendation,
<https://www.w3.org/TR/mediacapture-streams/>. <https://www.w3.org/TR/mediacapture-streams/>.
6.2. Informative References 6.2. Informative References
[RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model [RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
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<https://www.rfc-editor.org/info/rfc5888>. <https://www.rfc-editor.org/info/rfc5888>.
[RFC7656] Lennox, J., Gross, K., Nandakumar, S., Salgueiro, G., and [RFC7656] Lennox, J., Gross, K., Nandakumar, S., Salgueiro, G., and
B. Burman, Ed., "A Taxonomy of Semantics and Mechanisms B. Burman, Ed., "A Taxonomy of Semantics and Mechanisms
for Real-Time Transport Protocol (RTP) Sources", RFC 7656, for Real-Time Transport Protocol (RTP) Sources", RFC 7656,
DOI 10.17487/RFC7656, November 2015, DOI 10.17487/RFC7656, November 2015,
<https://www.rfc-editor.org/info/rfc7656>. <https://www.rfc-editor.org/info/rfc7656>.
[RFC8825] Alvestrand, H., "Overview: Real-Time Protocols for [RFC8825] Alvestrand, H., "Overview: Real-Time Protocols for
Browser-Based Applications", RFC 8825, Browser-Based Applications", RFC 8825,
DOI 10.17487/RFC8825, November 2020, DOI 10.17487/RFC8825, January 2021,
<https://www.rfc-editor.org/info/rfc8825>. <https://www.rfc-editor.org/info/rfc8825>.
[RFC8843] Holmberg, C., Alvestrand, H., and C. Jennings, [RFC8843] Holmberg, C., Alvestrand, H., and C. Jennings,
"Negotiating Media Multiplexing Using the Session "Negotiating Media Multiplexing Using the Session
Description Protocol (SDP)", RFC 8843, Description Protocol (SDP)", RFC 8843,
DOI 10.17487/RFC8843, November 2020, DOI 10.17487/RFC8843, January 2021,
<https://www.rfc-editor.org/info/rfc8843>. <https://www.rfc-editor.org/info/rfc8843>.
[WEBIDL] Chen, E. and T. Gu, "Web IDL", W3C Editor's Draft, August [WEBIDL] Chen, E. and T. Gu, "Web IDL", W3C Editor's Draft, August
2020, <https://heycam.github.io/webidl/>. 2020, <https://heycam.github.io/webidl/>.
Appendix A. Design Considerations, Rejected Alternatives Appendix A. Design Considerations, Rejected Alternatives
One suggested mechanism has been to use CNAME instead of a new One suggested mechanism has been to use CNAME instead of a new
attribute. This was abandoned because CNAME identifies a attribute. This was abandoned because CNAME identifies a
synchronization context; one can imagine both wanting to have tracks synchronization context; one can imagine both wanting to have tracks
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