I like the idea of standardizing the channel maps. I would suggest the following channel orderings:
6.1: L R C LFE Ls Rs Cs (MPEG 6.1 A layout) 7.1: L R C LFE Ls Rs Rls Rrs (MPEG 7.1 B layout) I think this more closely matches what Apple has done and what the default WAVE channel order is (http://msdn.microsoft.com/en-us/windows/hardware/gg463006.aspx). Stephen On Friday, September 21, 2012 at 5:22 PM, Ralph Giles wrote: > The FLAC format specification never defined the semantics of 7- and > 8-channel files, which has caused some pain for some years now. > > Attached is a patch to define them. I don't know if this follows > "follows SMPTE/ITU-R recommendations," but it follows common tool > practice. I chose the set of surround speaker designations used by home > theatre systems, which is the same set used by the Vorbis and Opus mappings. > > The ordering follows the WAVE file format, rather than the Vorbis order > of other Xiph codecs. This matches what flac has done for the existing > mappings, and it allegedly what current tools like libavformat are doing. > > Please consider applying this patch to have a definitive statement on > the channel map for implementors to follow. > > -r > > P.S. This doesn't update the flac command-line tool to enforce this > mapping. That needs to be done as well, along with test files. > > _______________________________________________ > flac-dev mailing list > [email protected] (mailto:[email protected]) > http://lists.xiph.org/mailman/listinfo/flac-dev > > > > > Attachments: > - channel-mapping.patch >
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