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require "stringio"
module Ogg::Codecs
# See http://www.xiph.org/vorbis/doc/v-comment.html
# Methods to pack/unpack vorbis comment packets
# intended to be included into Codec classes
module VorbisComments
# unpack a packet, skipping the preamble
# returns a 2 element array being a Hash of tag/value pairs and the vendor string
def unpack_comments(packet, preamble="")
pio = StringIO.new(packet)
pio.read(preamble.length)
vendor_length = pio.read(4).unpack("V").first
vendor = pio.read(vendor_length)
tag = {}
tag_size = pio.read(4).unpack("V")[0]
tag_size.times do |i|
size = pio.read(4).unpack("V")[0]
comment = pio.read(size)
unless RUBY_VERSION[0..2] == "1.8"
comment.force_encoding("UTF-8")
end
key, val = comment.split(/=/, 2)
tag[key.downcase] = val
end
#framing bit = pio.read(1).unpack("C")[0]
[ tag, vendor ]
end
# Pack tag Hash and vendor string into an ogg packet.
def pack_comments(tag, vendor, preamble="")
packet_data = "".force_encoding("binary")
packet_data << preamble
packet_data << [ vendor.length ].pack("V")
packet_data << vendor
packet_data << [tag.size].pack("V")
tag.each do |k,v|
tag_data = "#{ k }=#{ v }"
unless RUBY_VERSION[0..2] == "1.8"
tag_data.force_encoding("binary")
end
packet_data << [ binary_size(tag_data) ].pack("V")
packet_data << tag_data
end
packet_data << "\001"
packet_data
end
def binary_size(s)
if RUBY_VERSION[0..2] == "1.8"
s.size
else
s.dup.force_encoding("BINARY").size
end
end
end
end
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