Class: WahWah::Ogg::OpusTag

Inherits:
Object
  • Object
show all
Includes:
VorbisComment
Defined in:
lib/wahwah/ogg/opus_tag.rb

Constant Summary

Constants included from VorbisComment

VorbisComment::COMMET_FIELD_MAPPING

Instance Method Summary collapse

Methods included from VorbisComment

#parse_vorbis_comment

Constructor Details

#initialize(identification_packet, comment_packet) ⇒ OpusTag

Returns a new instance of OpusTag.



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# File 'lib/wahwah/ogg/opus_tag.rb', line 10

def initialize(identification_packet, comment_packet)
  # Identification packet structure:
  #
  # 1) "OpusHead"
  # 2) [version] = read 8 bits as unsigned integer
  # 3) [audio_channels] = read 8 bit as unsigned integer
  # 4) [pre_skip] = read 16 bits as unsigned little endian integer
  # 5) [input_sample_rate] = read 32 bits as unsigned little endian integer
  # 6) [output_gain] = read 16 bits as unsigned little endian integer
  # 7) [channel_mapping_family] = read 8 bit as unsigned integer
  # 8) [channel_mapping_table]
  @sample_rate = 48000
  @pre_skip = identification_packet[10..11].unpack1("v")

  comment_packet_id, comment_packet_body = [comment_packet[0..7], comment_packet[8..]]

  # Opus comment packet start with 'OpusTags'
  return unless comment_packet_id == "OpusTags"

  parse_vorbis_comment(comment_packet_body)
end