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I like the idea of standardizing the channel maps. I would suggest the following channel orderings:</div><div><br></div><div>6.1: L R C LFE Ls Rs Cs (MPEG 6.1 A layout)</div><div>7.1: L R C LFE Ls Rs Rls Rrs (MPEG 7.1 B layout)</div><div><br></div><div>I think this more closely matches what Apple has done and what the default WAVE channel order is (<a href="http://msdn.microsoft.com/en-us/windows/hardware/gg463006.aspx">http://msdn.microsoft.com/en-us/windows/hardware/gg463006.aspx</a>).</div><div><br></div><div>Stephen</div>
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<p style="color: #A0A0A8;">On Friday, September 21, 2012 at 5:22 PM, Ralph Giles wrote:</p>
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<span><div><div><div>The FLAC format specification never defined the semantics of 7- and</div><div>8-channel files, which has caused some pain for some years now.</div><div><br></div><div>Attached is a patch to define them. I don't know if this follows</div><div>"follows SMPTE/ITU-R recommendations," but it follows common tool</div><div>practice. I chose the set of surround speaker designations used by home</div><div>theatre systems, which is the same set used by the Vorbis and Opus mappings.</div><div><br></div><div>The ordering follows the WAVE file format, rather than the Vorbis order</div><div>of other Xiph codecs. This matches what flac has done for the existing</div><div>mappings, and it allegedly what current tools like libavformat are doing.</div><div><br></div><div>Please consider applying this patch to have a definitive statement on</div><div>the channel map for implementors to follow.</div><div><br></div><div> -r</div><div><br></div><div>P.S. This doesn't update the flac command-line tool to enforce this</div><div>mapping. That needs to be done as well, along with test files.</div></div><div><div>_______________________________________________</div><div>flac-dev mailing list</div><div><a href="mailto:flac-dev@xiph.org">flac-dev@xiph.org</a></div><div><a href="http://lists.xiph.org/mailman/listinfo/flac-dev">http://lists.xiph.org/mailman/listinfo/flac-dev</a></div></div></div></span>
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<div style="font-weight: bold; font-size: 14px; margin-bottom: 5px;">Attachments:</div>
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<div style="">- channel-mapping.patch</div>
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