[opus] Ogg Format

[Ralph Giles]

On 10/05/16 02:37 PM, Amit Ashara wrote:

> Is there a format document on the OpusTag structure? Search always shows
> up Vorbis but not Opus.

The basic format is shared with Vorbis, but the 'magic signature' is
different ('OpusTags' instead of '0x05vorbis') and vorbis puts a 0x01
value in an extra byte after the last tag.

The OpusTag packet layout is described in
https://tools.ietf.org/html/rfc7845.html#section-5.2

Common tag names used for interoperability are described in the Vorbis
documentation. See https://www.xiph.org/vorbis/doc/v-comment.html
There are more extensive tag lists on some other sites.

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