[flac-dev] Define 6.1 and 7.1 channel mappings

Justin Ruggles
2012-09-21T21:40:37Z

On 09/21/2012 05:22 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.

Yes please!

I doubt it will stop tool developers from using metadata to define other
layouts, but this is a step in the right direction.

Thanks,
Justin