Re: [AVTCORE] [Technical Errata Reported] RFC4867 (4347)
Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 06 April 2016 20:08 UTC
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Date: Wed, 06 Apr 2016 17:07:33 -0300
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Cc: Thomas.Belling@nokia.com, avt@ietf.org, "payload@ietf.org" <payload@ietf.org>
Subject: Re: [AVTCORE] [Technical Errata Reported] RFC4867 (4347)
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Payload, I should have included you from start. Please provide any input on this Errata as its relate to an RTP Payload format. Cheers Magnus Westerlund (AVTCORE WG chair) Den 2016-04-04 kl. 14:36, skrev Magnus Westerlund: > WG, > > I am co-author of this document. If there are any controversy around the > consensus here I will let my co-chair or the AD judge that. > > However, the WG should progress this Errata. It has been created due to > actual interoperability issues that has been discussed in 3GPP SA4. From > my perspective the errata also represents the intention of the document. > Thus I propose that this errata is verified. Please provide any feedback > by the 18th of April. > > Cheers > > Magnus Westerlund > > > > > Den 2015-04-27 kl. 12:44, skrev RFC Errata System: >> The following errata report has been submitted for RFC4867, >> "RTP Payload Format and File Storage Format for the Adaptive >> Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs". >> >> -------------------------------------- >> You may review the report below and at: >> http://www.rfc-editor.org/errata_search.php?rfc=4867&eid=4347 >> >> -------------------------------------- >> Type: Technical >> Reported by: Thomas Belling <Thomas.Belling@nokia.com> >> >> Section: 4.3.1 >> >> Original Text >> ------------- >> CMR (4 bits): Indicates a codec mode request sent to the speech >> encoder at the site of the receiver of this payload. The value of >> the CMR field is set to the frame type index of the corresponding >> speech mode being requested. The frame type index may be 0-7 for >> AMR, as defined in Table 1a in [2], or 0-8 for AMR-WB, as defined >> in Table 1a in [4]. CMR value 15 indicates that no mode request >> is present, and other values are for future use. >> >> The codec mode request received in the CMR field is valid until the >> next codec mode request is received, i.e., a newly received CMR value >> corresponding to a speech mode, or NO_DATA overrides the previously >> received CMR value corresponding to a speech mode or NO_DATA. >> Therefore, if a terminal continuously wishes to receive frames in the >> same mode X, it needs to set CMR=X for all its outbound payloads, and >> if a terminal has no preference in which mode to receive, it SHOULD >> set CMR=15 in all its outbound payloads. >> >> If receiving a payload with a CMR value that is not a speech mode or >> NO_DATA, the CMR MUST be ignored by the receiver. >> >> >> Corrected Text >> -------------- >> CMR (4 bits): Indicates a codec mode request sent to the speech >> encoder at the site of the receiver of this payload. The value of >> the CMR field is set to the frame type index of the corresponding >> speech mode being requested. The frame type index may be 0-7 for >> AMR, as defined in Table 1a in [2], or 0-8 for AMR-WB, as defined >> in Table 1a in [4]. CMR value 15 indicates that the receiver has >> no preference in which mode within the negotiated mode set to >> receive, and other values are for future use. >> >> The codec mode request received in the CMR field is valid until the >> next codec mode request is received, i.e., a newly received CMR value >> corresponding to a speech mode, or CMR=15 overrides the previously >> received CMR value corresponding to a speech mode or CMR=15. >> Therefore, if a terminal continuously wishes to receive frames not >> higher than mode X, it needs to set CMR=X for all its outbound >> payloads, and if a terminal has no preference in which mode within >> the negotiated mode set to receive, it SHOULD set CMR=15 in all its >> outbound payloads. >> >> If receiving a payload with a CMR value that is not a speech mode or >> CMR=15, the CMR MUST be ignored by the receiver. >> >> >> Notes >> ----- >> The definition of CMR 15 as "no mode request is present", could be > understood to suggest that other previously received CMR values remain > applicable. However, this contradicts text in the subsequent paragraphs > suggesting CMR=15 should be used when the "terminal has no preference in > which mode to receive", and stating that any previously received CMR > value is overridden by CMR=15. >> >> It is thus unclear for a receiving entity that has previously >> received > a CMR value requesting a lower AMR mode and then receives a CMR value 15 > if it should continue to send using the lower AMR mode or if it can > select a higher mode within the negotiated mode set based on own > preferences. >> >> CMR 15 is referred to as "NO_DATA" in subsequent text, but "NO_DATA" > is not well defined. This value appears in the quoted references, but > these references are only quoted for CMR values 0 to 7/8. >> >> It is also not perfectly clear if CMR=15 allows for any mode, or >> only > modes within the negotiated mode set. However, the definition of the > mode-set parameter in Clause 8.1 suggests that only modes within the > negotiated mode-set can be sent when a mode-set has been negotiated. >> >> The text "if a terminal continuously wishes to receive frames in the > same mode X, it needs to set CMR=X for all its outbound payloads" seems > to suggest that the receiver will always follow the request, although it > may also choose to send lower modes, as explained in text further below. >> >> This erratum has been discussed and endorsed by the 3GPP SA4 group > before submission to IETF. >> >> Instructions: >> ------------- >> This erratum is currently posted as "Reported". If necessary, please >> use "Reply All" to discuss whether it should be verified or >> rejected. When a decision is reached, the verifying party (IESG) >> can log in to change the status and edit the report, if necessary. >> >> -------------------------------------- >> RFC4867 (draft-ietf-avt-rtp-amr-bis-06) >> -------------------------------------- >> Title : RTP Payload Format and File Storage Format for >> the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband >> (AMR-WB) Audio Codecs >> Publication Date : April 2007 >> Author(s) : J. Sjoberg, M. Westerlund, A. Lakaniemi, Q. Xie >> Category : PROPOSED STANDARD >> Source : Audio/Video Transport >> Area : Real-time Applications and Infrastructure >> Stream : IETF >> Verifying Party : IESG >> >> > > -- Magnus Westerlund ---------------------------------------------------------------------- Services, Media and Network features, Ericsson Research EAB/TXM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [AVTCORE] [Technical Errata Reported] RFC4867 (43… RFC Errata System
- Re: [AVTCORE] [Technical Errata Reported] RFC4867… Magnus Westerlund
- Re: [AVTCORE] [Technical Errata Reported] RFC4867… Magnus Westerlund
- [AVTCORE] [Errata Verified] RFC4867 (4347) RFC Errata System