[flac-dev] Define 6.1 and 7.1 channel mappings

[Stephen F. Booth]

Tim's proposal seems reasonable but it conflicts with the FLAC documentation that says the channel ordering follows SMPTE/ITU-R recommendations.  I think we may be butting up against an area where the standards aren't clear.  ITU-R BS.2159-4 (http://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BS.2159-4-2012-PDF-E.pdf) doesn't define a 7.1 layout but simply diagrams several possibilities on page 27.  DTS-HD seems to specify 7 different possible 7.1 layouts (http://www.scribd.com/doc/17630423/21/Channel-Layout). 

I think my preference for the Apple/Core Audio layouts is known but obviously any standard would be better than none.  Do I understand correctly that WAVE_FORMAT_EXTENSIBLE simply defines a standard channel order and FLAC would specify compatible channel masks? http://msdn.microsoft.com/en-us/library/windows/hardware/gg463006.aspx hasn't been updated since 2007 so I may have been looking at an old document.

Stephen 

On Wednesday, January 2, 2013 at 6:54 AM, Erik de Castro Lopo wrote:

> Tim W. wrote:
> 
> > I'm personally in favor of mapping (1) as it doesn't vary between 6.1/7.1,
> > and is fully compatible with the WAVEFORMATEXTENSIBLE specification.
> > 
> 
> 
> I'm in favour of Tims proposal and intent to apply Ralph's patch
> to implement this unless someone comes up with a really good reason
> not to.
> 
> Erik
> -- 
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