[Vorbis-dev] Mapping = 1 Ambisonic Vorbis flag

[Paul Martin]

On Mon, Sep 08, 2008 at 09:25:08AM +0000, Oliver Oli wrote:
> There where two proposals in the sursound mailing list. The first one was a
> simple non-extensible static mapping (similar to the current type 0),
> something like:
> 
> 1:  W
> 2:  WX
> 3:  WXY
> 4:  WXYz
> 5:  WXYUV
> 6:  WXYzUV
> 7:  WXYUVPQ
> 8:  WXYzUVPQ
> 9:  WXYzUVstr
> 11: WXYzUVstrPQ
> 16: WXYzUVstrPQnolmk

Why not make use of a text field? One character per channel. That way you
could also have "AB" for Blumlein stereo and "12" for dual channel.

(Incidentally, you don't need a separate representation for middle/side, as
Ambisonic's "WX" is equivalent.)

The disadvantage to that is that it puts a strain on the decoder to unravel
the channel mapping, as it would be legal to have "XYW" as a mapping.

-- 
Paul Martin <pm at nowster.org.uk>