RE: [AVT] File format for EVRC/SMV vocoder

Harinath Garudadri <hgarudad@qualcomm.com> Mon, 10 March 2003 17:10 UTC

Message-Id: <5.1.0.14.2.20030307095821.01e8bcf8@mail1.qualcomm.com>
Date: Fri, 07 Mar 2003 10:23:48 -0800
To: "Lars-Erik Jonsson (EAB)" <Lars-Erik.Jonsson@epl.ericsson.se>, Adam Li <adamli@icsl.ucla.edu>
From: Harinath Garudadri <hgarudad@qualcomm.com>
Subject: RE: [AVT] File format for EVRC/SMV vocoder
Cc: Ietf-Avt <avt@ietf.org>
In-Reply-To: <A943FD84BD9ED41193460008C7918050072E9028@ESEALNT419.al.sw. ericsson.se>
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At 12:58 PM 3/7/2003 +0100, Lars-Erik Jonsson (EAB) wrote:
>Adam and others,
>
>I thought the reason for defining also the file format in the IETF
>was to make it in line with the transport format, and also because
>you would get it almost "for free" when you define the transport
>format.

In RFC2658, the payload format for PureVoice, the fileformat for storing 
data was not specified. We wanted rectify this and hence the 
draft-garudadri-qcp-00.txt.

>The proposed new approach seems to take away those motives,
>and then I do not understand why we should do it in the IETF.
>
>Further, I wonder what would be the rationales for using this new
>QCP format instead of the file format defined in the EVRC/SMV draft?

It turns out that there have been multiple, independent implementations of 
the qcp format for quite some. Our understanding is that the qcp format is 
quite mature and many applications use this format to exchange PureVoice 
and EVRC data. It is also widely used in many CDMA handsets. 
draft-garudadri-qcp-00.txt did not propose storage format for SMV, but 
there have been suggestions to include SMV in the next revision.

>If we are to standardize a file format in this body, I can not see
>why we should not stick to the format that is already finalized and
>has been taken through our standards process.

I think it would be useful to understand the extent to which the format 
defined in EVRC/SMV draft has been implemented, tested and being used. We 
proposed MIME type audio/qcp with qcelp and evrc as parameters, but we were 
advised that a better technical solution was to reuse audio/evrc 
andaudio/qcelp. Thanks,

hari.

>/L-E
>
>
> > -----Original Message-----
> > From: Mark Baugher [mailto:mbaugher@cisco.com]
> >
> > Adam
> >    I have a question:  Why take a file format specification
> > through the IETF?
> >
> > Best regards, Mark
>_______________________________________________
>Audio/Video Transport Working Group
>avt@ietf.org
>https://www1.ietf.org/mailman/listinfo/avt

Dr. Hari Garudadri
phone : 858-651-6383
mobile : 858-229-2801
pager  : 858-653-0963 or hgarudadri@pager.qualcomm.com

[AVT] File format for EVRC/SMV vocoder Adam Li
[AVT] File format for EVRC/SMV vocoder Adam Li
[AVT] RE: File format for EVRC/SMV vocoder keith.miller
Re: [AVT] File format for EVRC/SMV vocoder Mark Baugher
RE: [AVT] File format for EVRC/SMV vocoder Lars-Erik Jonsson (EAB)
RE: [AVT] File format for EVRC/SMV vocoder Harinath Garudadri
Re: [AVT] File format for EVRC/SMV vocoder Harinath Garudadri
Re: [AVT] File format for EVRC/SMV vocoder Mark Baugher
RE: [AVT] File format for EVRC/SMV vocoder Randall Gellens
RE: [AVT] File format for EVRC/SMV vocoder Lars-Erik Jonsson (EAB)
[AVT] Issues for the file format for EVRC/SMV voc… Adam Li
[AVT] Re: Issues for the file format for EVRC/SMV… Randall Gellens
RE: [AVT] File format for EVRC/SMV vocoder Randall Gellens
RE: [AVT] File format for EVRC/SMV vocoder Harinath Garudadri
Re: [AVT] Re: Issues for the file format for EVRC… Jae-Yong Lee
RE: [AVT] File format for EVRC/SMV vocoder Pete McCann
RE: [AVT] File format for EVRC/SMV vocoder Jae-Yong Lee
RE: [AVT] File format for EVRC/SMV vocoder Jae-Yong Lee
RE: [AVT] File format for EVRC/SMV vocoder Stephen Casner
RE: [AVT] File format for EVRC/SMV vocoder Dave Singer