On Sat, 23 Aug 2003, Josh Coalson wrote:
> --- smoerk <[EMAIL PROTECTED]> wrote:
> > i didn't find anything about tagging flac files as surround files. i
> > think there should some possibility to tell the player how to play a
> > multi-channel file (how to map the different channels to the speakers
> > or if there some decode is needed, like for ambisonic files).
>
> it wouldn't be in the tags, it would be a specific channel
> assignment in the frame header:
>
> http://flac.sourceforge.net/format.html#frame_header
>
> there are currently none defined for >2 channels but there could be.
I've done a bit more research into what ambisonic is.
I'm not certain that this would be a good idea, but the four-channel
B-format ambisonic signal certainly maps very well to the channel
assignment header. The mid-side format is in fact the W and Y channels
of an ambisonic B-format recording; the additional X and Z channels are
just difference channels for the two other planes. In other words
W - omni-directional soundfield
X - difference of front/back
Y - difference of left/right
Z - difference of top/bottom
These are the first-order components of a sound field. The second order
components add five more channels, R, S, T, U and V, and can be seen
(along with the first order components) here:
http://members.tripod.com/martin_leese/Ambisonic/harmonic.html
cjs
--
Curt Sampson <[EMAIL PROTECTED]> +81 90 7737 2974 http://www.NetBSD.org
Don't you know, in this new Dark Age, we're all light. --XTC
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