Class: Net::RAOP::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/raop/client.rb

Constant Summary collapse

VERSION =

The version of Net::RAOP::Client you’re using

'0.1.1'
@@cache = 
"\0" * 16387

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host) ⇒ Client

Create a new Net::RAOP::Client to connect to host Airport Express



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# File 'lib/raop/client.rb', line 11

def initialize(host)
  @host         = host
  @aes_crypt    = aes_cipher
  @rtsp_client  = nil
  @session_id   = nil
  @data_socket  = nil
end

Class Method Details

.encode_alac(bits) ⇒ Object 



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# File 'lib/raop/client.rb', line 145

def encode_alac(bits)
  new_bits =
    bits.length == 16384 ?
    @@cache.dup : "\0" * (bits.length + 3)

  new_bits[0] = 32
  new_bits[2] = 2

  i = 0
  len = bits.length
  while i < len
    data = bits[i + 1]
    data1 = bits[i]

    new_bits[i + 2] |= data >> 7
    new_bits[i + 3] |= ((data & 0x7F) << 1) | (data1 >> 7)
    new_bits[i + 4] |= (data1 & 0x7F) << 1

    i += 2
  end
  new_bits
end

Instance Method Details

#connect ⇒ Object

Connect to the Airport Express



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# File 'lib/raop/client.rb', line 21

def connect
  random_data = Array.new(28) { |x| rand(0xFF) }.pack('C*')

  sid = sprintf('%0#10d', random_data.slice!(0, 4).unpack('L').first)
  sci = sprintf('%0#18X', random_data.slice!(0, 8).unpack('Q').first)\
    .slice(2..-1)
  sac = [random_data].pack('m')

  key = [rsa_encrypt(@aes_key)].pack('m')
  iv  = [@aes_iv].pack('m')

  @rtsp_client = Net::RTSP.new(@host, sid, sci)

  announce = Net::RTSP::Announce.new(sac, key, iv)
  response = @rtsp_client.request(announce)

  # FIXME Check for audio cable hookup

  response = @rtsp_client.request(Net::RTSP::Setup.new)
  transport_info = {}
  response['transport'].split(';').each do |token|
    k, v = token.split('=', 2)
    transport_info[k] = v
  end
  @data_socket = TCPSocket.open(@host, transport_info['server_port'])
  @session_id = response['session']

  response = @rtsp_client.request(Net::RTSP::Record.new(@session_id))
  params = Net::RTSP::SetParameter.new(@session_id,
                                       { :volume => -30 }
                                      )
  response = @rtsp_client.request(params)
end

#disconnect ⇒ Object

Disconnect from the Airport Express



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# File 'lib/raop/client.rb', line 76

def disconnect
  @rtsp_client.request(Net::RTSP::Teardown.new)
end

#play(file) ⇒ Object

Stream file to the Airport Express



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# File 'lib/raop/client.rb', line 68

def play(file)
  while data = file.read(4096 * 2 * 2)
    send_sample(self.class.encode_alac(data))
  end
end

#volume=(volume) ⇒ Object

Set the volume on the Airport Express. -144 is quiet, 0 is loud.

Raises:

  • (ArgumentError) 


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# File 'lib/raop/client.rb', line 57

def volume=(volume)
  volume = volume.abs
  raise ArgumentError if volume > 144
  params = Net::RTSP::SetParameter.new(@session_id,
                                       { :volume => "-#{volume}".to_i }
                                      )
  response = @rtsp_client.request(params)
end