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Define TOC sequence briefly.

Hopefully it's clear from this that the demuxer can parse the
TOC sequence to verify the equal-duration constraint.

--- a/doc/draft-terriberry-oggopus.xml

+++ b/doc/draft-terriberry-oggopus.xml

@@ -172,6 +172,8 @@

  <xref target="RFCOpus"/>.

 All of the Opus packets in a single Ogg packet MUST be constrained to have the

  same duration.

+The duration and coding modes of each Opus packet are contained in the

+ TOC (table of contents) sequence in the first few bytes.

 A decoder SHOULD treat any Opus packet whose duration is different from that of

  the first Opus packet in an Ogg packet as if it were an Opus packet with an

  illegal TOC sequence.