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Use 'front center' in the channel mapping table.

This clarifies the meaning in surround configurations and better
distinguishes it from 'rear center'.

--- a/doc/draft-ietf-codec-oggopus.xml

+++ b/doc/draft-ietf-codec-oggopus.xml

@@ -742,10 +742,10 @@

   <t>2 channels: stereo (left, right).</t>

   <t>3 channels: linear surround (left, center, right)</t>

   <t>4 channels: quadraphonic (front&nbsp;left, front&nbsp;right, rear&nbsp;left, rear&nbsp;right).</t>

-  <t>5 channels: 5.0 surround (front&nbsp;left, center, front&nbsp;right, rear&nbsp;left, rear&nbsp;right).</t>

-  <t>6 channels: 5.1 surround (front&nbsp;left, center, front&nbsp;right, rear&nbsp;left, rear&nbsp;right, LFE).</t>

-  <t>7 channels: 6.1 surround (front&nbsp;left, center, front&nbsp;right, side&nbsp;left, side&nbsp;right, rear&nbsp;center, LFE).</t>

-  <t>8 channels: 7.1 surround (front&nbsp;left, center, front&nbsp;right, side&nbsp;left, side&nbsp;right, rear&nbsp;left, rear&nbsp;right, LFE)</t>

+  <t>5 channels: 5.0 surround (front&nbsp;left, front&nbsp;center, front&nbsp;right, rear&nbsp;left, rear&nbsp;right).</t>

+  <t>6 channels: 5.1 surround (front&nbsp;left, front&nbsp;center, front&nbsp;right, rear&nbsp;left, rear&nbsp;right, LFE).</t>

+  <t>7 channels: 6.1 surround (front&nbsp;left, front&nbsp;center, front&nbsp;right, side&nbsp;left, side&nbsp;right, rear&nbsp;center, LFE).</t>

+  <t>8 channels: 7.1 surround (front&nbsp;left, front&nbsp;center, front&nbsp;right, side&nbsp;left, side&nbsp;right, rear&nbsp;left, rear&nbsp;right, LFE)</t>

 </list>

 This set of surround configurations and speaker location orderings is the same

  as the one used by the Vorbis codec. <xref target="vorbis-mapping"/>