Ruby SRT API [WIP]

A ruby gem which you can use to build SRT (Secure Reliable Transport) Servers and Clients.

Secure Reliable Transport (SRT) is an open source transport technology that optimizes streaming performance across unpredictable networks, such as the Internet.

From: Haivision

Ruby SRT is a Work in Progress, please create an issue if you find any bugs, leaks, or would like to request additional API.

Installation

Currently rbsrt must be build with llvm/clang. This will change in the future.

The gem requires Ruby 2.2 or higher.

Dependencies

You will need to install the SRT library. Visit the SRT Github Repo for detailed installation instructions.

On macOs run you can run brew install srt to install.

rbsrt gem

Install with rubygems:

gem install rbsrt

Alternativly you can install the rbsrt Ruby gem from source.

Clone the git repo:

git clone https://github.com/spllr/rbsrt.git

Install:

cd rbsrt
bundle install
rake install

It is possible to provide some information about the location of your srt installation by providing one or more of the following environment variables:

RBSRT_LIBSRT_HOME    # a path to the install directory of srt containing the lib and include dirs
RBSRT_LIBSRT_LIB_DIR # a path to the directory containing libsrt
RBSRT_LIBSRT_INCLUDE_DIR # a path to the directory containing libsrt headers

For example, you could use the your local srt development repo:

RBSRT_LIBSRT_HOME="/home/me/code/srt/.build" rake install

Examples

A Simple SRT Socket Server In File Mode

server = SRT::Socket.new
server.transmission_mode = :file

puts "server state=#{server.state}, id=#{server.id}"

server.bind "127.0.0.1", "5556"

puts "server #{server.state}"

server.listen 3

puts "server #{server.state}"

client = server.accept

puts "server accepted:  streamid=\"#{client.streamid}\", id=#{client.id}, tsbpdmode=#{client.tsbpdmode?}"

loop do
  break unless client.connected?
  break unless data = client.recvmsg
  puts "server received: #{data}"
rescue SRT::Error::CONNLOST => e
  puts "connection lost: #{e}"
  break
rescue SRT::Error => e
  puts "server error: #{e.class}"
end

puts "client closed #{client.closed?}"

server.close

puts "server done"

A Simple Socket Client In File Mode

client = SRT::Socket.new

client.streamid = "a ruby srt socket"
client.transmission_mode = :file

client.connect "127.0.0.1", "5556"

10.times do |i|
  payload = "Hello from ruby client #{i}"
  puts "will send: \"#{payload}\""
  client.sendmsg "Hello from ruby client #{i}"
  puts "did send: \"#{payload}\""
rescue SRT::Error => e
  puts "client error: #{e}"
end

client.close

A Simple SRT Socket Server In Live Mode

server = SRT::Socket.new
server.transmission_mode = :live

puts "server state=#{server.state}, id=#{server.id}"

server.bind "127.0.0.1", "5556"

puts "server #{server.state}"

server.listen 3

puts "server #{server.state}"

client = server.accept

puts "server accepted:  streamid=\"#{client.streamid}\", id=#{client.id}, tsbpdmode=#{client.tsbpdmode?}"

loop do
  break unless client.connected?
  break unless data = client.recvmsg
  puts "server received: #{data}"
rescue SRT::Error::CONNLOST => e
  puts "connection lost: #{e}"
  break
rescue SRT::Error => e
  puts "server error: #{e.class}"
end

puts "client closed #{client.closed?}"

server.close

puts "server done"

A Simple Socket Client In Live Mode

client = SRT::Socket.new

client.streamid = "a ruby srt socket"
client.transmission_mode = :live

client.connect "127.0.0.1", "5556"

100.times do |i|
  payload = "Hello from ruby client #{i}"
  client.sendmsg "Hello from ruby client #{i}"
  sleep 1 / 30 # mimic framerate
rescue SRT::Error => e
  puts "client error: #{e}"
end

client.close

A Simple Recording Server

This example shows how a naive recorder server can be build.

The server will accept incomming SRT connections and will write whatever comes in to a file on disk.

require 'rbsrt'

server = SRT::Server.new "0.0.0.0", "5555"

server.start do |connection|

  streaminfo = SRT::StreamIDComponents.new connection.streamid

  puts "new connection: streamid=#{streaminfo.resource_name}, connections=#{connection_count}, id=#{connection.id}"

  # only handle publishing clients
  return false unless streaminfo.mode == :publish

  output_file = File.new "recording-#{Process.pid}-#{connection.id}", "w+"
  output_file.close_on_exec = true

  connection.at_data do |chunk|
    puts "received data"
    output_file.write(chunk)
  end

  connection.at_close do
    puts "closed connection"
    output_file.close
  end
end

A Simple ffmpeg Sending Client

require 'rbsrt'
require 'uri'

puts "create srt client"

client = SRT::Client.new

streaminfo = SRT::StreamIDComponents.new :mode => :publish, 
                                         :type => :stream, 
                                         :resource_name => "my_movie.ts"

client.streamid = streaminfo.to_s

at_exit { client.close }

begin
  client.connect "127.0.0.1", "5555"
rescue SRT::Error => e
  puts "A STR Error occurred. #{e.message}"
  exit 1
rescue StandardError => e
  puts "Something went wrong: #{e.message}"
  exit 1
end

# run a ffmpeg command and write stdout to the client
require 'open3'

cmd = "ffmpeg -re -stream_loop 10 -i my_movie.ts -codec copy -f mpegts -"

Open3.popen3(cmd) do |stdin, stdout, stderr, wait_thr|
  stdout.each do |buf|
    client.sendmsg buf
  end
end

API

Also see the Haivision SRT docs, specificly the API-functions and API documents, for more information about SRT, it's API and underlaying concepts.

The Ruby SRT gem comes with the following items:

Item	Kind	Description
`SRT`	Module	The root module
`SRT::Socket`	Class	A general purpose SRT Socket
`SRT::Server`	Class	A multi-client SRT Server
`SRT::Connection`	Class	Used by SRT::Server to represent a client
`SRT::Client`	Class	A SRT Client
`SRT::Stats`	Class	Used to obtain statistics from a socket
`SRT::StreamIDComponents`	Class	SRT Access Control complient streamid parser and compiler
`SRT::Error`	Class	The base class for a number of SRT specific errors

`SRT` Module

The SRT module has the following constants:

Name	Kind	Description
VERSION	String	Gem version string
SRT_VERSION	String	The version of the linked libsrt

`SRT::Socket` Class

The SRT::Socket class is a general purpose SRT socket. It can be used to create both servers and clients.

The SRT::Socket supports the following methods:

Name	Kind	Description
#accept	`SRT::Socket`	Accept a new connection
#bind(address, port)		Bind the socket to an address and port
#broken?	Bool	True when the socket state is `:broken`
#close		Closes the socket
#closed?	Bool	True the when the socket state is `:closed`
#closing?	Bool	True the when the socket state is `:closing`
#connect(address, port)		Opens a connection to a server at `srt://#{address}:#{port}`
#connected?	Bool	True the when the socket state is `:conneted`
#connecting?	Bool	True the when the socket state is `:connecting`
#id	Any	An identifier for the socket. This identifier will be unique for all sockets existing at any one time but might not be unique over the lifetime of a script
#listen(maxbacklog)		Start listening. Must be called after `#bind`
#listening?	Bool	True the when the socket state is `:listening`
#nonexist?	Bool	True the when the socket state is `:nonexist`
#opened?	Bool	True the when the socket state is `:opened`
#rcvsyn=	Bool	Alias for `#read_sync`
#rcvsyn?	Bool	Alias for `#read_sync?`
#read	String	Alias for `#recvmsg`
#read_sync=	Bool	When true, set the socket to read in a non-blocking manner
#read_sync?	Bool	True when the socket is readable in a non-blocking manner
#ready?	Bool	True when the socket is ready for usage (e.g. initialized)
#recvmsg	String	Read data from the socket
#sendmsg(string)	String	Send bytes to the socket
#sndsyn=	Bool	Alias of `#write_sync=`
#sndsyn?	Bool	Alias of `#write_sync?`
#state	Symbol	Returns the state of the socket. Can be one of: `:broken`, `:closed`, `:closing`, `:connected`, `:connecting`, `:listening`, `:nonexist`, `:opened`, `:ready`
#streamid	String	The streamid of the socket if supplied
#streamid=	String	The streamid of the socket, must be 512 characters or less
#timestamp_based_packet_delivery_mode=	Bool	Indicates if the sending socket will control the timed delivery of data (e.g. video stream)
#timestamp_based_packet_delivery_mode?	Bool	True if the sending socket controls the timing of data delivery
#trans_mode=	Symbol	Alias for `#transmission_mode=`
#transmission_mode=	Symbol	Controls how the socket expects data transmission. Can be set to `:live` or `:file`
#transtype=	Symbol	Alias for `#transmission_mode=`
#tsbpdmode=	Bool	Alias of `#timestamp_based_packet_delivery_mode=`
#tsbpdmode?	Bool	Alias of `#timestamp_based_packet_delivery_mode?`
#write	String	Alias of `#sendmsg`
#write_sync=	Any	When true, set the socket to write in a non-blocking manner
#write_sync?	Any	True when the socket is writable in a non-blocking manner

`SRT::Server` Class

The SRT::Server class is an implementation of a multi-client SRT server. It does not inherit from SRT::Socket but has similar API where applicable.

The SRT::Server is a higher level abstraction freeing the developer of much of the boiletplate of building a server.

The SRT::Server will yield a new SRT::Connection instance when a new client connects.

The SRT::Server supports the following methods:

The constructor takes 2 aguments, an address and a port.Both must be strings.

Name	Kind	Description
#broken?	Bool	True when the server socket state is `:broken`
#closed?	Bool	True the when the server socket state is `:closed`
#closing?	Bool	True the when the server socket state is `:closing`
#connected?	Bool	True the when the server socket state is `:conneted`
#connecting?	Bool	True the when the server socket state is `:connecting`
#listening?	Bool	True the when the server socket state is `:listening`
#nonexist?	Bool	True the when the server socket state is `:nonexist`
#opened?	Bool	True the when the server socket state is `:opened`
#rcvsyn?	Bool	Alias for `#read_sync?`
#read_sync?	Bool	True when the server socket is readable in a non-blocking manner
#ready?	Bool	True when the server socket is ready for usage (e.g. initialized)
#start(&blck)	Bool	Starts the servers. The block will be executed each time a new connection is accepted. Return a falsy value to reject the connection. The block will executed with the `self` set to the server

`SRT::Connection` Class

The SRT::Connection class is used by the SRT::Server. You should not have to instantiate instances of this class yourself.

SRT::Connection does not inherit from SRT::Socket but has similar API where applicable.

Instances of SRT::Connection support the following methods:

Name	Kind	Description
#at_close(&blck)	Block	A block which will be called when the connection closed
#at_data(&block)	Block	A block which will be called when new data was read
#broken?	Bool	True when the connection socket state is `:broken`
#closed?	Bool	True the when the connection socket state is `:closed`
#closing?	Bool	True the when the connection socket state is `:closing`
#connected?	Bool	True the when the connection socket state is `:conneted`
#connecting?	Bool	True the when the connection socket state is `:connecting`
#id	Any	An identifier for the connection. This identifier will be unique for all sockets existing at any one time but might not be unique over the lifetime of a script
#listening?	Bool	True the when the connection socket state is `:listening`
#nonexist?	Bool	True the when the connection socket state is `:nonexist`
#opened?	Bool	True the when the connection socket state is `:opened`
#ready?	Bool	True when the connection socket is ready for usage (e.g. initialized)
#sendmsg(string)	String	Send bytes to the socket
#sndsyn=	Bool	Alias of `#write_sync=`
#sndsyn?	Bool	Alias of `#write_sync?`
#state	Symbol	Returns the state of the socket. Can be one of: `:broken`, `:closed`, `:closing`, `:connected`, `:connecting`, `:listening`, `:nonexist`, `:opened`, `:ready`
#streamid	String	The streamid of the socket if supplied
#streamid=	String	The streamid of the socket, must be 512 characters or less
#timestamp_based_packet_delivery_mode=	Bool	Indicates if the sending socket will control the timed delivery of data (e.g. video stream)
#timestamp_based_packet_delivery_mode?	Bool	True if the sending socket controls the timing of data delivery
#trans_mode=	Symbol	Alias for `#transmission_mode=`
#transmission_mode=	Symbol	Controls how the socket expects data transmission. Can be set to `:live` or `:file`
#transtype=	Symbol	Alias for `#transmission_mode=`
#tsbpdmode=	Bool	Alias of `#timestamp_based_packet_delivery_mode=`
#tsbpdmode?	Bool	Alias of `#timestamp_based_packet_delivery_mode?`
#write	String	Alias of `#sendmsg`
#write_sync=	Any	When true, set the socket to write in a non-blocking manner
#write_sync?	Any	True when the socket is writable in a non-blocking manner

`SRT::Client` Class

The SRT::Client can be used to connect to a SRT server.

Instances of SRT::Client support the following methods and attributes:

Name	Kind	Description
#broken?	Bool	True when the socket state is `:broken`
#close		Closes the socket
#closed?	Bool	True the when the socket state is `:closed`
#closing?	Bool	True the when the socket state is `:closing`
#connect(address, port)		Opens a connection to a server at `srt://#{address}:#{port}`
#connected?	Bool	True the when the socket state is `:conneted`
#connecting?	Bool	True the when the socket state is `:connecting`
#id	Any	An identifier for the socket. This identifier will be unique for all sockets existing at any one time but might not be unique over the lifetime of a script
#listening?	Bool	True the when the socket state is `:listening`
#nonexist?	Bool	True the when the socket state is `:nonexist`
#opened?	Bool	True the when the socket state is `:opened`
#rcvsyn=	Bool	Alias for `#read_sync`
#rcvsyn?	Bool	Alias for `#read_sync?`
#read	String	Alias for `#recvmsg`
#read_sync=	Bool	When true, set the socket to read in a non-blocking manner
#read_sync?	Bool	True when the socket is readable in a non-blocking manner
#ready?	Bool	True when the socket is ready for usage (e.g. initialized)
#recvmsg	String	Read data from the socket
#sendmsg(string)	String	Send bytes to the socket
#sndsyn=	Bool	Alias of `#write_sync=`
#sndsyn?	Bool	Alias of `#write_sync?`
#state	Symbol	Returns the state of the socket. Can be one of: `:broken`, `:closed`, `:closing`, `:connected`, `:connecting`, `:listening`, `:nonexist`, `:opened`, `:ready`
#streamid	String	The streamid of the socket if supplied
#streamid=	String	The streamid of the socket, must be 512 characters or less
#timestamp_based_packet_delivery_mode=	Bool	Indicates if the sending socket will control the timed delivery of data (e.g. video stream)
#timestamp_based_packet_delivery_mode?	Bool	True if the sending socket controls the timing of data delivery
#trans_mode=	Symbol	Alias for `#transmission_mode=`
#transmission_mode=	Symbol	Controls how the socket expects data transmission. Can be set to `:live` or `:file`
#transtype=	Symbol	Alias for `#transmission_mode=`
#tsbpdmode=	Bool	Alias of `#timestamp_based_packet_delivery_mode=`
#tsbpdmode?	Bool	Alias of `#timestamp_based_packet_delivery_mode?`
#write	String	Alias of `#sendmsg`
#write_sync=	Any	When true, set the socket to write in a non-blocking manner
#write_sync?	Any	True when the socket is writable in a non-blocking manner

`SRT::Poll` Class

The SRT::Poll class provides a way to handle multiple sockets simultaneously. It's function is similar to IO.select.

For example, you could have create a multi-client server using SRT::Poll:

  require "rbsrt"

  server = SRT::Socket.new

  server = SRT::Socket.new
  server.bind "0.0.0.0", "6789"
  server.listen 3

  poll = SRT::Poll.new

  poll.add server, :in

  loop do
    poll.wait do |readable, writable, errors|
      readable.each do |socket|
        if socket == server
          client = socket.accept            # accept new client
          poll.add client, :in, :out, :err  # add client to the poll
          puts "accepted client"
        else
          data = socket.recvmsg             # read data from a client
          puts "received data"
          poll.remote socket unless data    # remove client from the poll
        end
      end
    end
  end

SRT::Poll supports the following actions:

Name	Alias	Description
`:in`	`:read`	report readiness for reading or incoming connection on a listener socket
`:out`	`:write`	report readiness for writing or a successful connection
`:err`	`:error`	report errors on the socket
`:et`	`:edge`	the event will be edge-triggered. In the edge-triggered mode the function will only return socket states that have changed since the last call.

Instances of SRT::Poll supports the following methods:

Name	Kind	Description
`#add(sock, *flags)`	Bool	Add a socket to the Poll
`#remove(sock)`	Socket	Remove a socket from the Poll
`#update(sock, *flags)`	Update the flags for the socket

For more info see the Asynchronous Operations Epoll section in the SRT docs.

`SRT::StreamIDComponents` Class

SRT provides a Access Control Guideline allowing a more fine grained method of specifying the intent of connection. Using the "#streamid" clients and servers can pack a number of properties on the socket.

The SRT::StreamIDComponents class can be used to parse and compile such an extended streamid string.

Instances of SRT::StreamIDComponents support the following methods and attributes:

Name	Kind	Description
#host_name	String	The hostname associated with the socket
#host_name=	String	Set the host associated with the socket. When the host has a pathname, and no other `#resource_name` is specified, the path will will be used as the `#resource_name`.
#mode	Symbol	The mode associated with the socket. Can be one of: `:request`, `:publish`, `:bidirectional`
#mode=	Any	Set the mode associated with the socket. Can be one of: `:request`, `:publish`, `:bidirectional`
#resource_name	Any	The resource name associated with the socket. e.g. "stream1", "/movies/butterfly.ts", "movies.ts?gid=1234"
#resource_name=	Any	Set the resource name associated with the socket.
#sessionid	Any	A temporary resource identifier negotiated with the server, used just for verification. Useful when using a different authentication server to negotiate access to a resource.
#sessionid=	Any	Set the session id
#to_s	Any	Compiles the Access Control string
#type	Any	The type associated with the socket. Can be one of `:stream`, `:file`, `:auth`
#type=	Any	Set the type associated with the socket. Can be one of `:stream`, `:file`, `:auth`
#user_name	Any	The user name associated with the socket
#user_name=	Any	Set the user name associated with the socket

You can set and get any non-standard property on the SRT::StreamIDComponents by simply calling it's getter or setter method:

streamid = SRT::StreamIDComponents.new

# standard

streamid.mode = :publish
streamid.type = :live
streamid.resource_name = "movie1.ts"

# non standard

streamid.my_property = "foo"
streamid.bar = "baz"

You can use the SRT::StreamIDComponents to set and retrieve Access Control properties:

# ... on the client side ...

client = SRT::Client.new

streamid = SRT::StreamIDComponents.new
streamid.mode = :publish
streamid.type = :live
streamid.resource_name = "movie1.ts"

client.streamid = streamid.to_s

# ...


# ... on the server side ...

client = server.accept

streamid = SRT::StreamIDComponents.new client.streamid

if streamid.mode == :publish
  # read from the client
elsif streamid.mode == :request
  # write to the client
end

# ...

You may also pass a hash to construct the SRT::StreamIDComponents:

streamid = SRT::StreamIDComponents.new :mode => :publish,
                                       :type => :live,
                                       :resource_name => "my_movie.ts",
                                       :user_name => "admin",
                                       :sessionid => "12345",
                                       :host_name => "stream.recce.nl",
                                       :some_custom_property => "somevalue"

`SRT::Stats` Class

The SRT::Stats class can be used to pull statistics from a SRT::Socket.

stats = SRT::Stats.new my_socket_or_connection_or_server

puts stats.pkt_sent_total

The initializer takes a srt socket like instance and an optional :clear => true/false flag.

See https://github.com/Haivision/srt/blob/master/docs/statistics.md for more information about all the field.

Instances of SRT::Stats have the following properties:

Name	Alias	Description
`#msTimeStamp`	`#ms_time_stamp`, `#mstimestamp`	time since the UDT entity is started, in milliseconds
`#pktSentTotal`	`#pkt_sent_total`, `#pktsenttotal`	total number of sent data packets, including retransmissions
`#pktRecvTotal`	`#pkt_recv_total`, `#pktrecvtotal`	total number of received packets
`#pktSndLossTotal`	`#pkt_snd_loss_total`, `#pktsndlosstotal`	total number of lost packets (sender side)
`#pktRcvLossTotal`	`#pkt_rcv_loss_total`, `#pktrcvlosstotal`	total number of lost packets (receiver side)
`#pktRetransTotal`	`#pkt_retrans_total`, `#pktretranstotal`	total number of retransmitted packets
`#pktSentACKTotal`	`#pkt_sent_ack_total`, `#pktsentacktotal`	total number of sent ACK packets
`#pktRecvACKTotal`	`#pkt_recv_ack_total`, `#pktrecvacktotal`	total number of received ACK packets
`#pktSentNAKTotal`	`#pkt_sent_nak_total`, `#pktsentnaktotal`	total number of sent NAK packets
`#pktRecvNAKTotal`	`#pkt_recv_nak_total`, `#pktrecvnaktotal`	total number of received NAK packets
`#usSndDurationTotal`	`#us_snd_duration_total`, `#ussnddurationtotal`	total time duration when UDT is sending data (idle time exclusive)
`#pktSndDropTotal`	`#pkt_snd_drop_total`, `#pktsnddroptotal`	number of too-late-to-send dropped packets
`#pktRcvDropTotal`	`#pkt_rcv_drop_total`, `#pktrcvdroptotal`	number of too-late-to play missing packets
`#pktRcvUndecryptTotal`	`#pkt_rcv_undecrypt_total`, `#pktrcvundecrypttotal`	number of undecrypted packets
`#pktSndFilterExtraTotal`	`#pkt_snd_filter_extra_total`, `#pktsndfilterextratotal`	number of control packets supplied by packet filter
`#pktRcvFilterExtraTotal`	`#pkt_rcv_filter_extra_total`, `#pktrcvfilterextratotal`	number of control packets received and not supplied back
`#pktRcvFilterSupplyTotal`	`#pkt_rcv_filter_supply_total`, `#pktrcvfiltersupplytotal`	number of packets that the filter supplied extra (e.g. FEC rebuilt)
`#pktRcvFilterLossTotal`	`#pkt_rcv_filter_loss_total`, `#pktrcvfilterlosstotal`	number of packet loss not coverable by filter
`#byteSentTotal`	`#byte_sent_total`, `#bytesenttotal`	total number of sent data bytes, including retransmissions
`#byteRecvTotal`	`#byte_recv_total`, `#byterecvtotal`	total number of received bytes
`#byteRcvLossTotal`	`#byte_rcv_loss_total`, `#bytercvlosstotal`	total number of lost bytes SRT_ENABLE_LOSTBYTESCOUNT
`#byteRetransTotal`	`#byte_retrans_total`, `#byteretranstotal`	total number of retransmitted bytes
`#byteSndDropTotal`	`#byte_snd_drop_total`, `#bytesnddroptotal`	number of too-late-to-send dropped bytes
`#byteRcvDropTotal`	`#byte_rcv_drop_total`, `#bytercvdroptotal`	number of too-late-to play missing bytes (estimate based on average packet size)
`#byteRcvUndecryptTotal`	`#byte_rcv_undecrypt_total`, `#bytercvundecrypttotal`	number of undecrypted bytes
`#pktSent`	`#pkt_sent`, `#pktsent`	number of sent data packets, including retransmissions
`#pktRecv`	`#pkt_recv`, `#pktrecv`	number of received packets
`#pktSndLoss`	`#pkt_snd_loss`, `#pktsndloss`	number of lost packets (sender side)
`#pktRcvLoss`	`#pkt_rcv_loss`, `#pktrcvloss`	number of lost packets (receiver side)
`#pktRetrans`	`#pkt_retrans`, `#pktretrans`	number of retransmitted packets
`#pktRcvRetrans`	`#pkt_rcv_retrans`, `#pktrcvretrans`	number of retransmitted packets received
`#pktSentACK`	`#pkt_sent_ack`, `#pktsentack`	number of sent ACK packets
`#pktRecvACK`	`#pkt_recv_ack`, `#pktrecvack`	number of received ACK packets
`#pktSentNAK`	`#pkt_sent_nak`, `#pktsentnak`	number of sent NAK packets
`#pktRecvNAK`	`#pkt_recv_nak`, `#pktrecvnak`	number of received NAK packets
`#pktSndFilterExtra`	`#pkt_snd_filter_extra`, `#pktsndfilterextra`	number of control packets supplied by packet filter
`#pktRcvFilterExtra`	`#pkt_rcv_filter_extra`, `#pktrcvfilterextra`	number of control packets received and not supplied back
`#pktRcvFilterSupply`	`#pkt_rcv_filter_supply`, `#pktrcvfiltersupply`	number of packets that the filter supplied extra (e.g. FEC rebuilt)
`#pktRcvFilterLoss`	`#pkt_rcv_filter_loss`, `#pktrcvfilterloss`	number of packet loss not coverable by filter
`#mbpsSRate`	`#mbps_s_rate`, `#mbpssrate`	sending rate in Mb/s
`#mbpsRecvRate`	`#mbps_recv_rate`, `#mbpsrecvrate`	receiving rate in Mb/s
`#usSndDuration`	`#us_snd_duration`, `#ussndduration`	busy sending time (i.e., idle time exclusive)
`#pktReorderDistance`	`#pkt_reorder_distance`, `#pktreorderdistance`	size of order discrepancy in received sequences
`#pktRcvAvgBelatedTime`	`#pkt_rcv_avg_belated_time`, `#pktrcvavgbelatedtime`	average time of packet delay for belated packets (packets with sequence past the ACK)
`#pktRcvBelated`	`#pkt_rcv_belated`, `#pktrcvbelated`	number of received AND IGNORED packets due to having come too late
`#pktSndDrop`	`#pkt_snd_drop`, `#pktsnddrop`	number of too-late-to-send dropped packets
`#pktRcvDrop`	`#pkt_rcv_drop`, `#pktrcvdrop`	number of too-late-to play missing packets
`#pktRcvUndecrypt`	`#pkt_rcv_undecrypt`, `#pktrcvundecrypt`	number of undecrypted packets
`#byteSent`	`#byte_sent`, `#bytesent`	number of sent data bytes, including retransmissions
`#byteRecv`	`#byte_recv`, `#byterecv`	number of received bytes
`#byteRcvLoss`	`#byte_rcv_loss`, `#bytercvloss`	number of retransmitted bytes SRT_ENABLE_LOSTBYTESCOUNT
`#byteRetrans`	`#byte_retrans`, `#byteretrans`	number of retransmitted bytes
`#byteSndDrop`	`#byte_snd_drop`, `#bytesnddrop`	number of too-late-to-send dropped bytes
`#byteRcvDrop`	`#byte_rcv_drop`, `#bytercvdrop`	number of too-late-to play missing bytes (estimate based on average packet size)
`#byteRcvUndecrypt`	`#byte_rcv_undecrypt`, `#bytercvundecrypt`	number of undecrypted bytes
`#usPktSndPeriod`	`#us_pkt_snd_period`, `#uspktsndperiod`	packet sending period, in microseconds
`#pktFlowWindow`	`#pkt_flow_window`, `#pktflowwindow`	flow window size, in number of packets
`#pktCongestionWindow`	`#pkt_congestion_window`, `#pktcongestionwindow`	congestion window size, in number of packets
`#pktFlightSize`	`#pkt_flight_size`, `#pktflightsize`	number of packets on flight
`#msRTT`	`#ms_rtt`, `#msrtt`	RTT, in milliseconds
`#mbpsBandwidth`	`#mbps_bandwidth`, `#mbpsbandwidth`	estimated bandwidth, in Mb/s
`#byteAvailSndBuf`	`#byte_avail_snd_buf`, `#byteavailsndbuf`	available UDT sender buffer size
`#byteAvailRcvBuf`	`#byte_avail_rcv_buf`, `#byteavailrcvbuf`	available UDT receiver buffer size
`#mbpsMaxBW`	`#mbps_max_bw`, `#mbpsmaxbw`	Transmit Bandwidth ceiling (Mbps)
`#byteMSS`	`#byte_mss`, `#bytemss`	MTU
`#pktSndBuf`	`#pkt_snd_buf`, `#pktsndbuf`	UnACKed packets in UDT sender
`#byteSndBuf`	`#byte_snd_buf`, `#bytesndbuf`	UnACKed bytes in UDT sender
`#msSndBuf`	`#ms_snd_buf`, `#mssndbuf`	UnACKed timespan (msec) of UDT sender
`#msSndTsbPdDelay`	`#ms_snd_tsb_pd_delay`, `#mssndtsbpddelay`	Timestamp-based Packet Delivery Delay
`#pktRcvBuf`	`#pkt_rcv_buf`, `#pktrcvbuf`	Undelivered packets in UDT receiver
`#byteRcvBuf`	`#byte_rcv_buf`, `#bytercvbuf`	Undelivered bytes of UDT receiver
`#msRcvBuf`	`#ms_rcv_buf`, `#msrcvbuf`	Undelivered timespan (msec) of UDT receiver
`#msRcvTsbPdDelay`	`#ms_rcv_tsb_pd_delay`, `#msrcvtsbpddelay`	Timestamp-based Packet Delivery Delay

`SRT::Error` Classes

SRT specifies a number of error types which can occur. The gem defines an Error class for each one allowing the developer to rescue and handle specific errors.

If you want to catch any SRT error, you can rescue SRT::Error, when you need more fine grained control (e.g. non block read and write no-data errors), rescue the appropriate error.

Each error has both a constant, and an instance variable defined with it's corresponding error code, these codes correspond with the SRT C API error codes (e.g. SRT::Error::ASYNCRCV::Code, err.code).

The gem supplies the following SRT specific errors:

Error	Description
SRT::Error	The base class of any SRT related error
SRT::Error::ASYNCFAIL	...
SRT::Error::ASYNCRCV	A non-blocking socket did have data available.
SRT::Error::ASYNCSND	A non-blocking socket could not accept data.
SRT::Error::BOUNDSOCK	...
SRT::Error::CONGEST	...
SRT::Error::CONNFAIL	...
SRT::Error::CONNLOST	...
SRT::Error::CONNREJ	...
SRT::Error::CONNSETUP	...
SRT::Error::CONNSOCK	...
SRT::Error::DUPLISTEN	...
SRT::Error::FILE	...
SRT::Error::INVALBUFFERAPI	...
SRT::Error::INVALMSGAPI	...
SRT::Error::INVOP	...
SRT::Error::INVPARAM	...
SRT::Error::INVPOLLID	...
SRT::Error::INVRDOFF	...
SRT::Error::INVSOCK	...
SRT::Error::INVWROFF	...
SRT::Error::LARGEMSG	...
SRT::Error::NOBUF	...
SRT::Error::NOCONN	...
SRT::Error::NOLISTEN	...
SRT::Error::NOSERVER	...
SRT::Error::PEERERR	...
SRT::Error::RDPERM	...
SRT::Error::RDVNOSERV	...
SRT::Error::RDVUNBOUND	...
SRT::Error::RESOURCE	...
SRT::Error::SECFAIL	...
SRT::Error::SOCKFAIL	...
SRT::Error::THREAD	...
SRT::Error::TIMEOUT	...
SRT::Error::UNBOUNDSOCK	...
SRT::Error::UNKNOWN	...
SRT::Error::WRPERM	...

License

All Ruby code is released under the MIT License. All C code is released under the Mozilla Public License, v. 2.0.

Name		Name	Last commit message	Last commit date
Latest commit History 18 Commits
.github		.github
bin		bin
docs		docs
ext/rbsrt		ext/rbsrt
lib		lib
test		test
.gitignore		.gitignore
Gemfile		Gemfile
Gemfile.lock		Gemfile.lock
MIT-LICENSE		MIT-LICENSE
MPL-2_0-LICENSE		MPL-2_0-LICENSE
README.md		README.md
Rakefile		Rakefile
rbsrt.gemspec		rbsrt.gemspec

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Ruby SRT API [WIP]

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rbsrt gem

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A Simple SRT Socket Server In File Mode

A Simple Socket Client In File Mode

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A Simple Socket Client In Live Mode

A Simple Recording Server

A Simple ffmpeg Sending Client

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`SRT::Server` Class

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Ruby SRT API [WIP]

Table Of Contents

Installation

Dependencies

rbsrt gem

Examples

A Simple SRT Socket Server In File Mode

A Simple Socket Client In File Mode

A Simple SRT Socket Server In Live Mode

A Simple Socket Client In Live Mode

A Simple Recording Server

A Simple ffmpeg Sending Client

API

SRT Module

SRT::Socket Class

SRT::Server Class

SRT::Connection Class

SRT::Client Class

SRT::Poll Class

SRT::StreamIDComponents Class

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`SRT` Module

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