Reliable way to identify Ogg types?

["Michael A. Peters" <mpeters@xxxxxxx>]

When I use fileinfo on an uploaded Ogg file, the mime it returns is 
Application/Ogg which is almost useless.

Is there a reliable php way, preferably without needing to execute shell 
commands, to positively identify a file as Ogg Theora or Ogg Vorbis?

Thanks for suggestions.

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