Review requested: audio/atrac3 media type registration

[Colin Perkins]

On 27 Feb 2008, at 04:43, Mark Baker wrote:
> On 2/26/08, actech <actech at jp.sony.com> wrote:
>>  In ATRAC receiver side, it is required to know sampling  
>> frequency, bit-rate and
>>  channel configuration in order to switch and initialize the  
>> decoder and
>>  associated hardware for immediate starting of ATRAC3, ATRAC-X or  
>> ATRAC Advanced
>>  Lossless decoding.
>>
>>  We think it is the best way to signal above parameters in SDP  
>> session with
>>  media type registarion procedure.
>
> Hi Jun.  I suppose that answers my question about a recipient being
> able to determine those parameters from the data itself, but I'm still
> not clear why a parameter is marked as required when it can only have
> a single value.  Is it perhaps because other values may be supported
> in the future?  Some other reason?

It's required by SDP signalling, which is the main place this media  
type will be used, since many other media types support variable rates.

-- 
Colin Perkins
http://csperkins.org/