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ExSDP

Hex.pm API Docs CircleCI

Parser and serializer for Session Description Protocol. Based on RFC4566

Installation

The package can be installed by adding ex_sdp to your list of dependencies in mix.exs:

def deps do
  [
    {:ex_sdp, "~> 1.1"}
  ]
end

Usage

Parser

Parser parses string with \r\n terminated lines. (although it will also accept records terminated with a single newline character)

"""
v=0
o=jdoe 2890844526 2890842807 IN IP4 10.47.16.5
s=Very fancy session name
i=A Seminar on the session description protocol
u=http://www.example.com/seminars/sdp.pdf
[email protected] (Jane Doe)
p=111 111 111
c=IN IP4 224.2.17.12/127
b=AS:256
t=2873397496 2873404696
r=604800 3600 0 90000
r=7d 1h 0 25h
z=2882844526 -1h 2898848070 0
k=clear:key
a=recvonly
a=key:value
m=audio 49170 RTP/AVP 0
i=Sample media title
k=prompt
m=video 51372 RTP/AVP 99
a=rtpmap:99 h263-1998/90000
"""
|> String.replace("\n", "\r\n")
|> ExSDP.parse()

# =>
{:ok,
 %ExSDP{
   attributes: [{"key", "value"}, :recvonly],
   bandwidth: [%ExSDP.Bandwidth{bandwidth: 256, type: :AS}],
   connection_data: %ExSDP.ConnectionData{
     address: {224, 2, 17, 12},
     address_count: nil,
     network_type: "IN",
     ttl: 127
   },
   email: "[email protected] (Jane Doe)",
   encryption: %ExSDP.Encryption{key: "key", method: :clear},
   media: [
     %ExSDP.Media{
       attributes: [],
       bandwidth: [%ExSDP.Bandwidth{bandwidth: 256, type: :AS}],
       connection_data: %ExSDP.ConnectionData{
         address: {224, 2, 17, 12},
         address_count: nil,
         network_type: "IN",
         ttl: 127
       },
       encryption: %ExSDP.Encryption{key: nil, method: :prompt},
       fmt: [0],
       port: 49170,
       port_count: 1,
       protocol: "RTP/AVP",
       title: "Sample media title",
       type: :audio
     },
     %ExSDP.Media{
       attributes: [
         %ExSDP.Attribute.RTPMapping{
           clock_rate: 90000,
           encoding: "h263-1998",
           params: nil,
           payload_type: 99
         }
       ],
       bandwidth: [%ExSDP.Bandwidth{bandwidth: 256, type: :AS}],
       connection_data: %ExSDP.ConnectionData{
         address: {224, 2, 17, 12},
         address_count: nil,
         network_type: "IN",
         ttl: 127
       },
       encryption: %ExSDP.Encryption{key: "key", method: :clear},
       fmt: 'c',
       port: 51372,
       port_count: 1,
       protocol: "RTP/AVP",
       title: nil,
       type: :video
     }
   ],
   origin: %ExSDP.Origin{
     address: {10, 47, 16, 5},
     network_type: "IN",
     session_id: 2890844526,
     session_version: 2890842807,
     username: "jdoe"
   },
   phone_number: "111 111 111",
   session_information: "A Seminar on the session description protocol",
   session_name: "Very fancy session name",
   time_repeats: [
     %ExSDP.RepeatTimes{
       active_duration: 3600,
       offsets: [0, 90000],
       repeat_interval: 604800
     },
     %ExSDP.RepeatTimes{
       active_duration: 3600,
       offsets: [0, 90000],
       repeat_interval: 604800
     }
   ],
   time_zones_adjustments: %ExSDP.Timezone{
     corrections: [
       %ExSDP.Timezone.Correction{adjustment_time: 2882844526, offset: -1},
       %ExSDP.Timezone.Correction{adjustment_time: 2898848070, offset: 0}
     ]
   },
   timing: %ExSDP.Timing{start_time: 2873397496, stop_time: 2873404696},
   uri: "http://www.example.com/seminars/sdp.pdf",
   version: 0
 }}

Serializer

Serializer serializes ExSDP struct to a string with \r\n terminated lines.

%ExSDP{
   attributes: [{"key", "value"}, :recvonly],
   bandwidth: [%ExSDP.Bandwidth{bandwidth: 256, type: :AS}],
   connection_data: %ExSDP.ConnectionData{
     address: {224, 2, 17, 12},
     network_type: "IN",
     ttl: 127
   },
   email: "[email protected] (Jane Doe)",
   encryption: %ExSDP.Encryption{key: "key", method: :clear},
   media: [
     %ExSDP.Media{
       attributes: [],
       bandwidth: [%ExSDP.Bandwidth{bandwidth: 256, type: :AS}],
       connection_data: %ExSDP.ConnectionData{
         address: {224, 2, 17, 12},
         network_type: "IN",
         ttl: 127
       },
       encryption: %ExSDP.Encryption{method: :prompt},
       fmt: [0],
       port: 49170,
       port_count: 1,
       protocol: "RTP/AVP",
       title: "Sample media title",
       type: :audio
     },
     %ExSDP.Media{
       attributes: [
         %ExSDP.Attribute.RTPMapping{
           clock_rate: 90000,
           encoding: "h263-1998",
           payload_type: 99
         }
       ],
       bandwidth: [%ExSDP.Bandwidth{bandwidth: 256, type: :AS}],
       connection_data: %ExSDP.ConnectionData{
         address: {224, 2, 17, 12},
         network_type: "IN",
         ttl: 127
       },
       encryption: %ExSDP.Encryption{key: "key", method: :clear},
       fmt: 'c',
       port: 51372,
       port_count: 1,
       protocol: "RTP/AVP",
       type: :video
     }
   ],
   origin: %ExSDP.Origin{
     address: {10, 47, 16, 5},
     network_type: "IN",
     session_id: 2890844526,
     session_version: 2890842807,
     username: "jdoe"
   },
   phone_number: "111 111 111",
   session_information: "A Seminar on the session description protocol",
   session_name: "Very fancy session name",
   time_repeats: [
     %ExSDP.RepeatTimes{
       active_duration: 3600,
       offsets: [0, 90000],
       repeat_interval: 604800
     },
     %ExSDP.RepeatTimes{
       active_duration: 3600,
       offsets: [0, 90000],
       repeat_interval: 604800
     }
   ],
   time_zones_adjustments: %ExSDP.Timezone{
     corrections: [
       %ExSDP.Timezone.Correction{adjustment_time: 2882844526, offset: -1},
       %ExSDP.Timezone.Correction{adjustment_time: 2898848070, offset: 0}
     ]
   },
   timing: %ExSDP.Timing{start_time: 2873397496, stop_time: 2873404696},
   uri: "http://www.example.com/seminars/sdp.pdf",
   version: 0
}
|> to_string()

# =>
"""
v=0
o=jdoe 2890844526 2890842807 IN IP4 10.47.16.5
s=Very fancy session name
i=A Seminar on the session description protocol
u=http://www.example.com/seminars/sdp.pdf
[email protected] (Jane Doe)
p=111 111 111
c=IN IP4 224.2.17.12/127
b=AS:256
t=2873397496 2873404696
r=604800 3600 0 90000
r=604800 3600 0 90000
z=2882844526 -1h 2898848070 0
k=clear:key
a=key:value
a=recvonly
m=audio 49170 RTP/AVP 0
i=Sample media title
c=IN IP4 224.2.17.12/127
b=AS:256
k=prompt
m=video 51372 RTP/AVP 99
c=IN IP4 224.2.17.12/127
b=AS:256
k=clear:key
a=rtpmap:99 h263-1998/90000
"""

Copyright and License

Copyright 2020, Software Mansion

Software Mansion

Licensed under the Apache License, Version 2.0