rtsp¶ ↑

• github.com/turboladen/rtsp

<img src=“https://secure.travis-ci.org/turboladen/rtsp.png” alt=“Build Status” />

This library intends to follow the RTSP RFC document (2326) to allow for working with RTSP servers. By way of rtp, you can either inspect the RTP packets as they come across the wire or use the file that the data got saved to.

For more information:

• RTSP: tools.ietf.org/html/rfc2326

• RTP: tools.ietf.org/html/rfc3550

• SDP: tools.ietf.org/html/rfc4566

• All standard RTSP methods supported except REDIRECT.

• Captures RTP data to a file, or yields if a block is passed to #play.

• One client object can only handle 1 stream; use a client per stream until this functionality gets implemented.

• Only handles unicast, TCP RTSP communication.

• RTSP exceptions are all {RTSP::Error}s.

RTSP::Client.log?                # => false
RTSP::Client.log = true
client = RTSP::Client.new "rtsp://64.202.98.91/sa.sdp"

client.server_uri                   # => #<URI::Generic:0x00000100ba4db0 URL:rtsp://64.202.98.91:554/sa.sdp>
client.session_state                # => :init
client.cseq                         # => 1
client.connection.do_capture        # => true
client.connection.interleave        # => false
client.connection.timeout           # => 30
client.capturer.ip_addressing_type  # => :unicast
client.capturer.rtp_port            # => 6970
client.capturer.capture_file        # => #<File:/var/folders/tg/j9jxvvfs4qn9cg4vztzyy2gc0000gp/T/rtp_capture.raw-59901-1l8dgv2>
client.capturer.transport_protocol  # => :UDP

response = client.options
response.class             # => RTSP::Response
response.code              # => 200
response.message           # => "OK"
client.cseq                # => 2

response = client.describe
response.body.class             # => SDP::Description
response.content_type           # => "application/sdp"
response.server                 # => "DSS/5.5 (Build/489.7; Platform/Linux; Release/Darwin; )"
client.aggregate_control_track  # => "rtsp://64.202.98.91:554/sa.sdp/"
client.media_control_tracks     # => ["rtsp://64.202.98.91:554/sa.sdp/trackID=1"]
client.cseq                     # => 3

response = client.setup(client.media_control_tracks.first)
response.session[:session_id]   # => 7098486223178290313
client.session[:session_id]     # => 7098486223178290313
client.cseq                     # => 4
client.session_state            # => :ready

response = client.play(client.aggregate_control_track)
response.range            # => "npt=now="
resposne.rtp_info         # => "url=rtsp://64.202.98.91:554/sa.sdp/trackID=1"
client.session_state      # => :playing

# Wait while the video streams
sleep 5

client.pause(client.aggregate_control_track)
client.session_state    # => :ready

# Wait while the video is paused
sleep 2

client.teardown(client.aggregate_control_track)
client.session[:session_id]   # => 0
client.session_state          # => :init

# Check the streamed file's contents
puts client.capturer.capture_file     # => (Lots of data)

As of RTP 0.1.0, you can now inspect and use packets as they come across the wire:

client = RTSP::Client.new "rtsp://64.202.98.91/sa.sdp"
client.describe
client.setup(client.media_control_tracks.first)
payload_file = File.new('rtp.data', 'wb')

client.play(client.aggregate_control_track) do |packet|
  puts "packet is a #{packet.class}"
  puts "RTP seqence: #{packet.sequence_number}"
  puts "RTP payload type: #{packet.payload_type}"

  # Let's save the payload data while we're at it...
  payload_file.write(packet.rtp_payload)
end

payload_file.close

Take a look at the RTP::Packet docs for more information.

RTSP also provides a rtsp_client executable that allows a little talking to an RTSP server.

Knowing which tracks are available on the server can help you determine which tracks to use in your programmatic use of an RTSP::Client object to try to play. Show the available aggregate control track and media control tracks:

$ rtsp_client --show-tracks rtsp://64.202.98.91/sa.sdp

Or if you want the entire SDP description from the server:

$ rtsp_client --describe rtsp://64.202.98.91/sa.sdp

And then, of course, pull a stream (this assumes you SETUP the first media track and call play on the aggregate track):

$ rtsp_client --stream rtsp://64.202.98.91/sa.sdp

As usual, get help by:

$ rtsp_client --help

• (Tested) Rubies

  • 1.9.2

  • 1.9.3

• RubyGems

  • sdp

  • rtp

  • parslet

• (sudo) gem install rtsp

After checking out the source, run:

$ bundle install

This task will install any missing dependencies.

(The MIT License)

Copyright © 2011 Steve Loveless, Mike Kirby

See LICENSE.rdoc for details.