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module Ogg::Codecs
class Speex
class << self
include VorbisComments
def match?(header_packet)
header_packet.start_with?("Speex")
end
def decode_headers(reader)
init_packet, tag_packet = reader.read_packets(2)
info = extract_info(init_packet)
info[:tag], info[:tag_vendor] = unpack_comments(tag_packet)
return info
end
def replace_tags(reader, writer, new_tags, vendor)
_ = reader.read_packets(1) # tag_packet
writer.write_packets(0, pack_comments(new_tags, vendor))
end
def extract_info(info_packet)
_, #speex_string,
_, #speex_version,
_, #speex_version_id,
_, #header_size,
samplerate,
_, #mode,
_, #mode_bitstream_version,
channels,
nominal_bitrate,
#framesize, vbr
_, _ = info_packet.unpack("A8A20VVVVVVVVV")
#not sure how to make sense of the bitrate info,picard doesn't show it either...
return { :channels => channels, :samplerate => samplerate, :nominal_bitrate => nominal_bitrate }
end
end
end
end
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