Class: RTCP::SDES

Inherits:
RTCP
  • Object
show all
Defined in:
lib/rtcp/sdes.rb

Overview

SDES: Source Description RTCP Packet Documentation: RFC 3550, 6.5

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

header |V=2|P| SC | PT=SDES=202 | length |

+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

chunk | SSRC/CSRC_1 |

1    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                           SDES items                          |
     |                              ...                              |
     +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

chunk | SSRC/CSRC_2 |

2    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                           SDES items                          |
     |                              ...                              |
     +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

Constant Summary collapse

PT_ID = 
202
SDES_CHUNK_TYPES = 
{
  1 => :cname,
  2 => :name,
  3 => :email,
  4 => :phone,
  5 => :loc,
  6 => :tool,
  7 => :note,
  8 => :priv
}

Constants inherited from RTCP

VERSION

Instance Attribute Summary collapse

Attributes inherited from RTCP

#length, #type_id

Instance Method Summary collapse

Methods inherited from RTCP

decode, decode_all, #to_s

Instance Attribute Details

#chunks ⇒ Object (readonly)

Returns the value of attribute chunks.



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# File 'lib/rtcp/sdes.rb', line 35

def chunks
  @chunks
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/rtcp/sdes.rb', line 35

def version
  @version
end

Instance Method Details

#decode(packet_data) ⇒ Object 



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# File 'lib/rtcp/sdes.rb', line 37

def decode(packet_data)
  vprc, packet_type, length = packet_data.unpack('CCn')
  ensure_packet_type(packet_type)

  @length  = 4 * (length + 1)
  @version = vprc >> 6
  count    = vprc & 15
  loop_length = @length
  sdes_data = payload_data(packet_data, @length, 4)
  loop_length -= 4
  chunks = []
  for i in 0..count-1
    ssrc, payload = sdes_data.unpack('Na*')
    loop_length -= 4
    sdes_items = []
    while loop_length > 0
      type_id, payload = payload.unpack('Ca*')
      loop_length -= 1
      break if type_id == 0

      len, payload = payload.unpack("Ca*")
      val, payload = payload.unpack("a#{len}a*")
      type = SDES_CHUNK_TYPES[type_id] || type_id
      sdes_items.push({
            type: type,
            data: val,
            length: len
      })
      loop_length -= (2 + len)
    end
    chunks.push(
    {
      ssrc: ssrc,
      sdes_items: sdes_items
    })
  end
  @chunks = chunks
  self
end