Rtp Fec Implementation
Begen Standards Track [Page 10] RFC 6364 SDP Elements for FEC Framework October 2011 Receivers supporting the SDP Capability Negotiation Framework [RFC5939] MAY also use this framework to negotiate all, or Luby Obsoletes: 3452 L. Repair FEC Payload ID Two formats for the Repair FEC Payload ID are defined, format A and format B. 1 2 3 0 1 2 3 4 5 6 7 8 CDPs must include an indication of which of the two FEC Payload ID formats is included in each packet if they wish to support such FEC Schemes. 7.
Sender: A system supporting the sending functions of a CDP and FEC scheme according to this specification. Any complete multicast CDP MUST provide congestion control that conforms to , in particular, Section 3.2 of that document. Note that if no FEC repair packets are received, then no FEC decoding is possible, and it is unnecessary for the receiver to identify the Source FEC Packet Identification Information for Definitions and Abbreviations ...................................5 3.
Rtp Fec Implementation
For this purpose, we introduce the attribute 'fec-source-flow'. The field type is unsigned integer. Roca, et al. In case the incoming source packet flow has a gap in the sequence numbers, then implementors SHOULD insert an ADU in the source block that complies to the format of the
Sender Procedure The sender signals the FEC Framework Configuration Information for each FEC Framework instance in a periodic SAP announcement message [RFC2974]. This enables the node acting as the offerer to offer 'FEC Framework Configuration Information' for each available FEC instance and the node acting as the answerer to convey the chosen FEC Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Rfc 5109 Sender Procedure ....................................9 5.1.2.
o s[i] be the smallest integer such that s[i]*T >= (l[i]+3). The length of the encoding format must either be fixed or be derived by examining the encoded octets themselves. Construction of a source block from ADUs. Roca, et al.
ADU: Application Data Unit ADUI: Application Data Unit Information. Fec Wiki It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Watson, et al.
The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Motivation ................................................27 8.2. Rtp Fec Implementation Two 'containers' are provided for communicating the FEC information described above, but there is not necessarily a one-to-one correspondence between the class of FEC information and the mechanism used. Rtp Forward Error Correction If confidentiality is a concern, it is RECOMMENDED that one of these solutions be used.
For example, a multimedia (VoD) client may send a request via unicasting for a particular content to the multimedia (VoD) server, which may offer various options such as encodings, bitrates, transport, For example, the initial bytes can include some kind of length indication. When used with the Raptor codes specified in [RFC5053], this scheme is equivalent to that specified in [DVBTS] for arbitrary packet flows. 7.2. A_large -- the length of each of the larger source blocks in symbols. What Is Forward Error Correction
Repair Window The repair window is the time that spans a FEC block, which consists of the source block and the corresponding repair packets. IANA Considerations ...........................................21 12.1. What Are the Key Aspects to Consider? ....................35 10.2. Introduction ....................................................3 2.
Cunche ISSN: 2070-1721 INSA-Lyon/INRIA J. Forward Error Correction Example Watson, et al. In this document, the range of values for FEC Encoding IDs is 0 to 255.
Source Block: a block of k source symbols that are considered together for the encoding.
Note also that the source packet flow processed by the FEC encoder MUST have consecutive sequence numbers. A specific CDP MAY define this mapping, or it MAY be left as implementation dependent at the sender. If the sender needs to modify the announced FEC Framework Configuration Information for one or more FEC instances, then the sender must send a new announcement message with a different 'Message Forward Error Correction Tutorial Acknowledgments This document is largely based on RFC 3452 , and thus thanks are due to the additional authors of that document: J.
Type, semantics, and encoding format of a Scheme-specific FEC Object Transmission Information element. This specification reserves the range 0-127 for the values of FEC Encoding IDs for Fully-Specified FEC schemes and the range 128-255 for the values of Under-Specified FEC schemes. The client selects the suitable options and answers the server, paving the way for the content to be unicast on the chosen transport from the server to the client. For a specific FEC scheme, a means MAY be defined for repair data to be carried over RTP, in which case, the repair packet payload format starts with the RTP header.
FEC Framework: A protocol framework for the definition of Content Delivery Protocols using FEC, such as the framework defined in this document. Standards Track [Page 23] RFC 6363 FEC Framework October 2011 A single FEC repair flow provides repair packets for a single instance of the FEC Framework. Kouvelas, "Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)", RFC 4601, August 2006. Watson, et al.
I = T - A_small * N Each of the first I source blocks then consists of A_large source symbols; each source symbol is E octets in length. The variable-length SS-FSSI and FSSI containers transmit the information in textual representation and contain zero or more distinct elements, whose descriptions are provided by the fully specified FEC schemes. Watson, et al. RFC 3452 , which is obsoleted by this document, contained a previous version, which was published in the "Experimental" category.