[hydra-dev] White paper addressing Service Discovery for Hydra

[Nick Lewis]

Ken

Re section 3:
In order to minimise latency I think any media conversion should be
accomplished in a maximum of only three steps. There should be a small
set of "native" formats for which there is fully meshed conversion
capability. Other media formats should be convertible to one of these
formats. For audio I suggest the following uncompressed native formats:

8/8 Narrowband Voice @ 64Kb/s
16/16 Wideband Voice @ 256Kb/s
16/48 Standard Definition Music @ 768Kb/s
24/96 High Definition Music @ 2304Kb/s 

with channel bundling for mono, stereo, (quad?) and 7+1

All native formats should be converted in a single step e.g. straight
from a 7+1 bundle of 24/96 HD audio to mono 8/8 narrowband audio

Re section 4:
When choosing a Media Specification Language do not overlook RFC 2327
Session Description Protocol. It may not be perfect but is extremely
widely used because of its association with sip. If something a bit more
powerful is needed then I guess H.245 could fit the bill.

-- N_L

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