draft-ietf-fecframe-sdp-elements-10.txt   draft-ietf-fecframe-sdp-elements-11.txt 
FEC Framework A. Begen FEC Framework A. Begen
Internet-Draft Cisco Internet-Draft Cisco
Intended status: Standards Track October 9, 2010 Intended status: Standards Track October 21, 2010
Expires: April 12, 2011 Expires: April 24, 2011
Session Description Protocol Elements for FEC Framework Session Description Protocol Elements for FEC Framework
draft-ietf-fecframe-sdp-elements-10 draft-ietf-fecframe-sdp-elements-11
Abstract Abstract
This document specifies the use of Session Description Protocol (SDP) This document specifies the use of Session Description Protocol (SDP)
to describe the parameters required to signal the Forward Error to describe the parameters required to signal the Forward Error
Correction (FEC) Framework Configuration Information between the Correction (FEC) Framework Configuration Information between the
sender(s) and receiver(s). This document also provides examples that sender(s) and receiver(s). This document also provides examples that
show the semantics for grouping multiple source and repair flows show the semantics for grouping multiple source and repair flows
together for the applications that simultaneously use multiple together for the applications that simultaneously use multiple
instances of the FEC Framework. instances of the FEC Framework.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 12, 2011. This Internet-Draft will expire on April 24, 2011.
Copyright Notice Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the Copyright (c) 2010 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
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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instances. For this reason, as described in Section 3.3, individual instances. For this reason, as described in Section 3.3, individual
source flows MUST be identified with unique identifiers. For this source flows MUST be identified with unique identifiers. For this
purpose, we introduce the attribute 'fec-source-flow'. purpose, we introduce the attribute 'fec-source-flow'.
The syntax for the new attribute in ABNF [RFC5234] is as follows: The syntax for the new attribute in ABNF [RFC5234] is as follows:
fec-source-flow-line = "a=fec-source-flow:" SP source-id fec-source-flow-line = "a=fec-source-flow:" SP source-id
[";" SP tag-length] CRLF [";" SP tag-length] CRLF
source-id = "id=" src-id source-id = "id=" src-id
src-id = 1*DIGIT src-id = 1*DIGIT ; Represented as 32-bit non-negative
; integers and leading zeros are ignored
tag-length = "tag-len=" tlen tag-length = "tag-len=" tlen
tlen = %x31-39 *DIGIT tlen = %x31-39 *DIGIT
The REQUIRED parameter 'id' is used to identify the source flow. The REQUIRED parameter 'id' is used to identify the source flow.
Parameter 'id' MUST be an integer. Parameter 'id' MUST be an integer.
The 'tag-len' parameter is used to specify the length of the Explicit The 'tag-len' parameter is used to specify the length of the Explicit
Source FEC Payload ID field (in octets). In the case that an Source FEC Payload ID field (in octets). In the case that an
Explicit Source FEC Payload ID is used, the 'tag-len' parameter MUST Explicit Source FEC Payload ID is used, the 'tag-len' parameter MUST
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packets sooner, however, it SHOULD NOT register an FEC decoding packets sooner, however, it SHOULD NOT register an FEC decoding
failure until it waits at least for the repair-window duration. failure until it waits at least for the repair-window duration.
This document specifies a new attribute to describe the size of the This document specifies a new attribute to describe the size of the
repair window in milliseconds and microseconds. repair window in milliseconds and microseconds.
The syntax for the attribute in ABNF is as follows: The syntax for the attribute in ABNF is as follows:
repair-window-line = "a=repair-window:" window-size unit CRLF repair-window-line = "a=repair-window:" window-size unit CRLF
window-size = %x31-39 *DIGIT window-size = %x31-39 *DIGIT ; Represented as
; 32-bit non-negative integers
unit = "ms" / "us" unit = "ms" / "us"
<unit> is the unit of time the repair window size is specified with. <unit> is the unit of time the repair window size is specified with.
Two units are defined here: 'ms', which stands for milliseconds and Two units are defined here: 'ms', which stands for milliseconds and
'us', which stands for microseconds. 'us', which stands for microseconds.
The 'a=repair-window' attribute is a media-level attribute since each The 'a=repair-window' attribute is a media-level attribute since each
repair flow MAY have a different repair window size. repair flow MAY have a different repair window size.
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