ruby-ogg

Synopsis

ruby-ogg brings pure Ruby love to the Ogg container format. It provides a nice abstraction which permits you to access packets from an Ogg bitstream without worrying about strange things such as “captures” and “pages”. For more information about Ogg bitstreams check out the blog post at dismaldenizen.wordpress.com/2010/08/20/the-ogg-container-format-explained

require 'ogg'

open("file.ogg", "rb") do |file|
  dec = Ogg::Decoder.new(file) # Create a decoder for an Ogg file
  packet = dec.read_packet     # Direct access to packet, no pages!
  # Do something with the packet...
end

Vorbis

Vorbis is not the same as Ogg. Vorbis is an audio codec which is commonly packed in the Ogg container format with the file extension “.ogg”. Because Vorbis has become so deeply associated with Ogg (and I'm such a nice guy), a Vorbis metadata decoder is bundled with ruby-ogg. This provides a good example of how to use ruby-ogg, and is also fully functional. See the Vorbis::Info documentation for more information.

require 'vorbis'

Vorbis::Info.open('echoplex.ogg') do |info|
  info.comments[:artist].first #=> "Nine Inch Nails"
  info.comments[:title].first  #=> "Echoplex"
  info.sample_rate             #=> 44100
end

Features

  • 100% pure Ruby

  • Read Ogg bitstreams

  • Read Vorbis metadata

  • Optionally validate page integrity with CRCs (eg Ogg::Decoder.new(file, :verify_checksum => true))

TODO

  • Write Ogg bitstreams

  • Write Vorbis metadata

Links