OpenTok .NET SDK

The OpenTok .NET SDK provides methods for:

• Generating sessions and tokens for OpenTok applications that run on the .NET platform
• Working with OpenTok archives
• Working with OpenTok live streaming broadcasts
• Working with OpenTok SIP interconnect
• Sending signals to clients connected to a session
• Disconnecting clients from sessions
• Forcing clients in a session to disconnect or mute published audio

Installation

NuGet (recommended):

Using the Package Manager Console:

PM> Install-Package OpenTok

Manually:

Download the latest release from the Releases Page. Unzip the file and place the place the OpenTok.dll, dependent assemblies, and supporting files into your own project.

Usage

Initializing

Import the OpenTokSDK namespace into any files that will be using OpenTok objects. Then initialize an OpenTokSDK.OpenTok object using your own API Key and API Secret.

using OpenTokSDK;

// ...

int ApiKey = 000000; // YOUR API KEY
string ApiSecret = "YOUR API SECRET";
var OpenTok = new OpenTok(ApiKey, ApiSecret);

Creating Sessions

To create an OpenTok Session, call the OpenTok instance's CreateSession(string location, MediaMode mediaMode, ArchiveMode archiveMode) or CreateSessionAsync(string location, MediaMode mediaMode, ArchiveMode archiveMode) method. Each of the parameters are optional and can be omitted if not needed. They are:

• string location : An IPv4 address used as a location hint. (default: "")

• MediaMode mediaMode : Specifies whether the session will use the OpenTok Media Router (MediaMode.ROUTED) or attempt to transmit streams directly between clients (MediaMode.RELAYED, the default)

• ArchiveMode archiveMode : Specifies whether the session will be automatically archived (ArchiveMode.ALWAYS) or not (ArchiveMode.MANUAL, the default)

The return value is a OpenTokSDK.Session object. Its Id property is useful to get an identifier that can be saved to a persistent store (such as a database).

// Create a session that will attempt to transmit streams directly between clients
var session = OpenTok.CreateSession();
// Store this sessionId in the database for later use:
string sessionId = session.Id;

// Create a session that uses the OpenTok Media Router (which is required for archiving)
var session = OpenTok.CreateSession(mediaMode: MediaMode.ROUTED);
// Store this sessionId in the database for later use:
string sessionId = session.Id;

// Create an automatically archived session:
var session = OpenTok.CreateSession(mediaMode: MediaMode.ROUTED, ArchiveMode.ALWAYS);
// Store this sessionId in the database for later use:
string sessionId = session.Id;

Generating Tokens

Once a Session is created, you can start generating Tokens for clients to use when connecting to it. You can generate a token either by calling an OpenTokSDK.OpenTok instance's GenerateToken(string sessionId, Role role, double expireTime, string data) method, or by calling a OpenTokSDK.Session instance's GenerateToken(Role role, double expireTime, string data) method after creating it. In the first method, the sessionId is required and the rest of the parameters are optional. In the second method, all the parameters are optional.

// Generate a token from a sessionId (fetched from database)
string token = OpenTok.GenerateToken(sessionId);

// Generate a token by calling the method on the Session (returned from CreateSession)
string token = session.GenerateToken();

// Set some options in a token
double inOneWeek = (DateTime.UtcNow.Add(TimeSpan.FromDays(7)).Subtract(new DateTime(1970, 1, 1))).TotalSeconds;
string token = session.GenerateToken(role: Role.MODERATOR, expireTime: inOneWeek, data: "name=Johnny");

Working with Archives

You can start the recording of an OpenTok Session using a OpenTokSDK.OpenTok instance's StartArchive(sessionId, name, hasVideo, hasAudio, outputMode, resolution) method. This will return an OpenTokSDK.Archive instance. The parameter name is optional and used to assign a name for the Archive. Note that you can only start an Archive on a Session that has clients connected.

// A simple Archive (without a name)
var archive = OpenTok.StartArchive(sessionId);

or

// A simple Archive (without a name)
var archive = await OpenTok.StartArchiveAsync(sessionId);

then

// Store this archive ID in the database for later use
Guid archiveId = archive.Id;

You can add a name for the archive (to use for identification) by setting the name parameter of the OpenTok.StartArchive() method.

You can also disable audio or video recording by setting the hasAudio or hasVideo parameter of the OpenTok.StartArchive() method false.

You can also set the resolution of the recording to high definition by setting the resolution parameter of the OpenTok.StartArchive() method to "1280x720". Please note that you cannot specify the resolution when you set the outputMode parameter to OutputMode.INDIVIDUAL.

By default, all streams are recorded to a single (composed) file. You can record the different streams in the session to individual files (instead of a single composed file) by setting the outputMode parameter of the OpenTok.StartArchive() method OutputMode.INDIVIDUAL.

You can stop the recording of a started Archive using a OpenTokSDK.OpenTok instance's StopArchive(String archiveId) method or using the OpenTokSDK.Archive instance's Stop() method.

// Stop an Archive from an archive ID (fetched from database)
var archive = OpenTok.StopArchive(archiveId);

or

var archive = OpenTok.StopArchiveAsync(archiveId);

To get an OpenTokSDK.Archive instance (and all the information about it) from an archive ID, use the OpenTokSDK.OpenTok instance's GetArchive(archiveId) method.

var archive = OpenTok.GetArchive(archiveId);

or

var archive = OpenTok.GetArchiveAsync(archiveId);

To delete an archive, you can call a OpenTokSDK.OpenTok instance's DeleteArchive(archiveId) method or call the OpenTokSDK.Archive instance's Delete() method.

// Delete an archive from an archive ID (fetched from database)
OpenTok.DeleteArchive(archiveId);

// Delete an archive from an Archive instance (returned from GetArchive)
Archive.Delete();

or

// Delete an archive from an archive ID (fetched from database)
OpenTok.DeleteArchiveAsync(archiveId);

// Delete an archive from an Archive instance (returned from GetArchive)
Archive.DeleteAsync();

You can also get a list of all the Archives you've created (up to 1000) with your API Key. This is done using an OpenTokSDK.OpenTok instance's ListArchives(int offset, int count) method. You may optionally paginate the Archives you receive using the offset and count parameters. This will return an OpenTokSDK.ArchiveList object.

// Get a list with the first 50 archives created by the API Key
var archives = OpenTok.ListArchives();
var archives = OpenTok.ListArchivesAsync();

// Get a list of the first 50 archives created by the API Key
var archives = OpenTok.ListArchives(0, 50);
var archives = OpenTok.ListArchivesAsync(0, 50);

// Get a list of the next 50 archives
var archives = OpenTok.ListArchives(50, 50);
var archives = OpenTok.ListArchivesAsync(50, 50);

// Get a list of the first 50 archives created for the given sessionId
var archives = OpenTok.ListArchives(sessionId:sessionId);
var archives = OpenTok.ListArchivesAsync(sessionId:sessionId);

Note that you can also create an automatically archived session, by passing in ArchiveMode.ALWAYS as the archiveMode parameter when you call the OpenTok.CreateSession() method (see "Creating Sessions," above).

Working with Streams

You can get information about a stream by calling the GetStream(sessionId, streamId) method of the OpenTok class.

Stream stream = OpenTok.GetStream(sessionId, streamId);

// Stream Properties
stream.Id; // string with the stream ID
stream.VideoType; // string with the video type
stream.Name; // string with the name
stream.LayoutClassList; // list with the layout class list

You can get information about all the streams in a session by calling the ListStreams(sessionId) method of the OpenTok class.

StreamList streamList = OpenTok.ListStreams(sessionId);

streamList.Count; // total count

Force Disconnecting

Your application server can disconnect a client from an OpenTok session by calling the ForceDisconnect(sessionId, connectionId) method of the OpenTok class.

// Force disconnect a client connection
OpenTok.ForceDisconnect(sessionId, connectionId);

Sending Signals

Once a Session is created, you can send signals to everyone in the session or to a specific connection. You can send a signal by calling the Signal(sessionId, signalProperties, connectionId) method of the OpenTok class.

The sessionId parameter is the session ID of the session.

The signalProperties parameter is an instance of the SignalProperties class where you can set the data paramter and the type parameter.

• data (string) -- The data string for the signal. You can send a maximum of 8kB.
• type (string) -- (Optional) The type string for the signal. You can send a maximum of 128 charaacters, and only the following characters are allowed: A-Z, a-z, numbers (0-9), '-', '_', and '~'.

The connectionId parameter is an optional string used to specify the connection ID of a client conencted to the session. If you specify this value, the signal is sent to the specified client. Otherwise, the signal is sent to all clients connected to the session.

string sessionId = "SESSIONID";
SignalProperties signalProperties = new SignalProperties("data", "type");
OpenTok.Signal(sessionId, signalProperties);

string connectionId = "CONNECTIONID";
OpenTok.Signal(sessionId, signalProperties, connectionId);

Working with live streaming broadcasts

You can start a live-streaming broadcast of an OpenTok Session using a OpenTokSDK.OpenTok instance's StartBroadcast(sessionId, hls, rtmpList, resolution, maxDuration, layout) method. This returns an OpenTokSDK.Broadcast instance.

Also see the documentation for the Opentok.StopBroadcast() and OpenTok.GetBroadcast() methods.

SIP

You can connect a SIP platform to an OpenTok session using the Opentok.Dial(sessionId, token, sipUri, options) or Opentok.DialAsync(sessionId, token, sipUri, options) method.

You can send DTMF digits to all participants an active OpenTok session, or to a specific client connected to that session, using the Opentok.PlayDTMF(sessionId, digits, connectionId) or Opentok.PlayDTMFAsync(sessionId, digits, connectionId) method.

Forcing clients in a session to disconnect or mute published audio

You can force a specific client to disconnect from an OpenTok session using the Opentok.ForceDisconnect(sessionId, connectionId) method.

You can force the publisher of a specific stream to stop publishing audio using the Opentok.ForceMuteStream(sessionId, stream) or Opentok.ForceMuteStreamAsync(sessionId, stream)method.

You can force the publisher of all streams in a session ((except for an optional list of streams) to stop publishing audio using the Opentok.ForceMuteAll(sessionId, excludedStreamIds) or Opentok.ForceMuteAllAsync(sessionId, excludedStreamIds) method. You can then disable the mute state of the session by calling the Opentok.DisableForceMute(sessionId) or Opentok.DisableForceMuteAsync(sessionId) method.

Changing the Timeout for Http Requests

If you would like to adjust the timeouts for Http Requests sent by the client SDK you can by calling OpenTok.SetDefaultRequestTimeout(int timeout) - note timeout is in milliseconds

this.OpenTok = new OpenTok(apiKey, apiSecret);
this.OpenTok.SetDefaultRequestTimeout(2000);

Samples

There are two sample applications included with the SDK. To get going as fast as possible, clone the whole repository and follow the Walkthroughs:

• HelloWorld
• Archiving

Documentation

Reference documentation is available at https://tokbox.com/developer/sdks/dot-net/reference/.

Requirements

You need an OpenTok API key and API secret, which you can obtain by logging into your TokBox account.

The OpenTok .NET SDK requires .NET Framework 4.5.2 or greater.

NOTE: When using on 4.5.2 TLS 1.2 is not enabled by default. You should use something like the following to force the runtime onto at least TLS 1.2

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Alternatively, if your application is dependant on a different version of TLS for other APIs, you can alternatively add TLS to the list of supported methods with a bitwise OR:

ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;

Release Notes

See the Releases page for details about each release.

Important changes since v2.2.0

Changes in v3.0.0:

This version requires .NET Framework 4.5.2 or greater.

Changes in v2.2.1:

The default setting for the CreateSession() method is to create a session with the media mode set to relayed. In previous versions of the SDK, the default setting was to use the OpenTok Media Router (media mode set to routed). In a relayed session, clients will attempt to send streams directly between each other (peer-to-peer); if clients cannot connect due to firewall restrictions, the session uses the OpenTok TURN server to relay audio-video streams.

Changes in v2.2.0:

This version of the SDK includes support for working with OpenTok archives.

This version of the SDK includes a number of improvements in the API design. These include a number of API changes:

• New OpenTok class -- The name of the main class has changed from OpenTokSDK to OpenTok. In the previous version, the constructor was OpenTokSDK(). In v2.2, it is OpenTok(int apiKey, int apiSecret).

• CreateSession -- In the previous version, there were two methods to create a session: OpenTokSDK.CreateSession(String location) and OpenTokSDK.CreateSession(String location, Dictionary<string, object> options). These methods returned a string (the session ID).

  In v2.2, the OpenTok class includes one method, which takes two parameters (both optional): CreateSession(string location = "", MediaMode mediaMode = MediaMode.ROUTED). The mediaMode parameter replaces the p2p.preference setting in the previous version. The method returns a Session Object.

• GenerateToken -- In the previous version, there were two methods: OpenTokSDK.GenerateToken(string sessionId) and OpenTokSDK.GenerateToken(string sessionId, Dictionary<string, object> options) In v2.2, this is replaced with the following method: OpenTokSDK.OpenTok.GenerateToken(string sessionId, Role role = Role.PUBLISHER, double expireTime = 0, string data = null). All parameters, except the sessionId parameter, are optional.

  Also, the Session class includes a method for generating tokens: OpenTokSDK.Session.GenerateToken(Role role = Role.PUBLISHER, double expireTime = 0, string data = null).

Development and Contributing

Interested in contributing? We :heart: pull requests! See the Development and Contribution guidelines.

Getting Help

We love to hear from you so if you have questions, comments or find a bug in the project, let us know! You can either:

• Open an issue on this repository
• See https://support.tokbox.com/ for support options
• Tweet at us! We're @VonageDev on Twitter
• Or join the Vonage Developer Community Slack

Further Reading

• Check out the Developer Documentation at https://tokbox.com/developer/