[vorbis-dev] Updated Vorbis RTP I-D

[smoerk]

I think we should find a more flexible way to define mapping of channels 
to different surround formats. how could i enocde left, right and LFE 
channel for 5.1? or l r c LFE or l r Sl Sr, etc...

then we have 7.1, 6.1...

and what's with ambisonics?

how are surround channels automatically down-mixed to stereo or mono?

Phil Kerr wrote:

> Another area where the Vorbis spec and current practices of the AVT WG
> differ is the output channel order.
> 
> The output channel order in draft-ietf-avt-profile-new-12 I-D, sect 4.1,
> defines the order as:
> 
>    l  left
>    r  right
>    c  center
>    S  surround
>    F  front
>    R  rear
> 
>    channels  description   channel
>                               1     2   3   4   5   6
>    __________________________________________________
>    2         stereo           l     r
>    3                          l     r   c
>    4         quadrophonic    Fl     Fr  Rl  Rr
>    4                          l     c   r   S
>    5                         Fl     Fr  Fc  Sl  Sr
>    6                          l     lc  c   r   rc  S
> 
> 
> 
> The 3, 5 and 6 channels layout do not match.
> 
> The I-D does state that the channel ordering SHOULD follow the AIFF-C
> format, so we can use the Vorbis layout if we push it, but this may be
> something we may want to review.

--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'vorbis-dev-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.