Review requested: audio/atrac3 media type registration

[Mark Baker]

On 2/19/08, Tom Taylor <tom.taylor at rogers.com> wrote:
> Please review the following media type registration. The source document is
>  http://www.ietf.org/internet-drafts/draft-ietf-avt-rtp-atrac-family-13.txt,
>  which is currently undergoing Working Group Last Call in the AVT Working Group.
>
>  Tom Taylor
>  AVT co-Chair
>
>     The media subtype for the Adaptive TRansform Codec version 3 (ATRAC3)
>     uses the template defined in RFC 4855 [6].
>
>     Note, any unknown parameter MUST be ignored by the receiver.
>
>     Type name:  audio
>
>     Subtype name:  atrac3
>
>     Required parameters:
>     rate:  Represents the sampling frequency in Hz of the original
>     audio data.  Permissible value is 44100 only.

Why is this required, yet has just the one permissible value?

>     baseLayer:  Indicates the encoded bit-rate in kbps for the audio
>     data to be streamed.  Permissible values are 66, 105 and 132.

Can this - or the rate even - not be determined from the data itself?
I'm just asking, as I know nothing about audio formats.

Everything else looks fine AFAICT.

Mark.
-- 
Mark Baker.  Ottawa, Ontario, CANADA.         http://www.markbaker.ca
Coactus; Web-inspired integration strategies  http://www.coactus.com