Class: Ogg::Codecs::Speex

Inherits:
Object
  • Object
show all
Extended by:
VorbisComments
Defined in:
lib/ogg/codecs/speex.rb

Class Method Summary collapse

Methods included from VorbisComments

binary_size, pack_comments, unpack_comments

Class Method Details

.decode_headers(reader) ⇒ Object 



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# File 'lib/ogg/codecs/speex.rb', line 10

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

.extract_info(info_packet) ⇒ Object 



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# File 'lib/ogg/codecs/speex.rb', line 22

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

.match?(header_packet) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ogg/codecs/speex.rb', line 6

def match?(header_packet)
  header_packet.start_with?("Speex")
end

.replace_tags(reader, writer, new_tags, vendor) ⇒ Object 



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# File 'lib/ogg/codecs/speex.rb', line 17

def replace_tags(reader, writer, new_tags, vendor)
  _ = reader.read_packets(1) # tag_packet
  writer.write_packets(0, pack_comments(new_tags, vendor))
end