Class: RTCP::RR

Inherits:
SR show all
Defined in:
lib/rtcp/rr.rb

Overview

RR: Receiver Report RTCP Packet Documentation: RFC 3550, 6.4.2

 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| RC | PT=RR=201 | length |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                     SSRC of packet sender                     |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

report | SSRC_1 (SSRC of first source) | block --------------------------------+

1    | fraction lost |       cumulative number of packets lost       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |           extended highest sequence number received           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      interarrival jitter                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         last SR (LSR)                         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                   delay since last SR (DLSR)                  |
     +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

report | SSRC_2 (SSRC of second source) | block --------------------------------+

2    :                               ...                             :
     +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
     |                  profile-specific extensions                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Constant Summary collapse

PT_ID = 
201

Constants inherited from RTCP

VERSION

Instance Attribute Summary collapse

Attributes inherited from SR

#ntp_timestamp, #octet_count, #packet_count, #rtp_timestamp

Attributes inherited from RTCP

#length, #type_id

Instance Method Summary collapse

Methods inherited from RTCP

decode, decode_all, #to_s

Instance Attribute Details

#padding ⇒ Object (readonly)

Returns the value of attribute padding.



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# File 'lib/rtcp/rr.rb', line 34

def padding
  @padding
end

#report_blocks ⇒ Object (readonly)

Returns the value of attribute report_blocks.



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# File 'lib/rtcp/rr.rb', line 34

def report_blocks
  @report_blocks
end

#ssrc ⇒ Object (readonly)

Returns the value of attribute ssrc.



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# File 'lib/rtcp/rr.rb', line 34

def ssrc
  @ssrc
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/rtcp/rr.rb', line 34

def version
  @version
end

Instance Method Details

#decode(packet_data) ⇒ Object 



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# File 'lib/rtcp/rr.rb', line 36

def decode(packet_data)
  vprc, packet_type, length, @ssrc = packet_data.unpack('CCnN')
  ensure_packet_type(packet_type)
  @length  = 4 * (length + 1)
  @version, @padding, rc = decode_vprc(vprc, @length - 8)
  @report_blocks = decode_reports(payload_data(packet_data, @length, 8), rc)
  self
end