Deployed on your server, the Agora Server Gateway SDK communicates with clients integrated with the Agora RTC SDK. You can use the Server Gateway SDK to transmit video and audio streams between the server and the client through SD-RTN™.

IAgoraService

IAgoraService is the entry point of the Agora Server Gateway SDK.

Method	Description
createAgoraService	Creates an `IAgoraService` object and returns the pointer.
initialize	Initializes the `IAgoraService` object.
release	Releases the `IAgoraService` object.
createRtcConnection	Creates an RTC connection object and returns the pointer.
createCustomAudioTrack1	Creates a local audio track object with the PCM data receiver and returns the pointer.
createCustomAudioTrack2	Creates a local audio track object with the receiver for encoded audio data and returns the pointer.
createMediaNodeFactory	Creates a media node factory and returns the pointer.
createCustomVideoTrack1	Creates a local video track object with the custom video source ans returns the pointer.
createCustomVideoTrack2	Creates a local video track object with the receiver for encoded video data and returns the pointer.
createMixedVideoTrack	Creates a local video track object with a video mixer and returns the pointer.

IRtcConnection

IRtcConnection allows an app to establish a connection to an Agora channel. In order to establish a connection, the app must provide an app ID, a token, and the ID of the channel that you want to join.

Method	Description
connect	Connects to an Agora RTC channel.
disconnect	Disconnects from the Agora RTC channel.
startLastmileProbeTest	Starts the last-mile network probe test.
stopLastmileProbeTest	Stops the last-mile network probe test.
renewToken	Renews the token.
getConnectionInfo	Gets the current connection information.
getLocalUser	Gets the ILocalUser object.
getRemoteUsers	Gets the information of remote users.
getUserInfo	Gets the information of a specified user in the channel.
registerObserver	Registers an `IRtcConnectionObserver` object.
unregisterObserver	Releases the registered `IRtcConnectionObserver` object.
getConnId	Gets the ID of the current connection.
getTransportStats	Gets the transportation statistics of this connection.
getAgoraParameter	Gets an `IAgoraParameter` object.

Connecting to an Agora channel is done asynchronously, and apps can listen for the connection states of both the local and remote user using an RTC connection observer.

Event	Description
onConnected	Occurs when the connection state changes to `STATE_CONNECTED`.
onDisconnected	Occurs when the connection state changes to `STATE_DISCONNECTED`.
onReconnecting	Occurs when the connection state changes to `STATE_RECONNECTING`.
onConnectionLost	Occurs when the SDK loses connection with the Agora channel.
onLastmileQuality	Reports the quality of the last mile network.
onLastmileProbeResult	Reports the last-mile network probe result.
onTokenPrivilegeWillExpire	Occurs when the token privilege expires in 30 seconds.
onTokenPrivilegeDidExpire	Occurs when the token privilege has expired.
onConnectionFailure	Occurs when the connection state changes to `STATE_FAILED`.
onUserJoined	Occurs when a remote user has successfully joined the channel.
onUserLeft	Occurs when a remote user has left the channel.
onTransportStats	Reports the transport statistics of the current connection,
onChangeRoleSuccess	Occurs when the role of the local user changes.
onChangeRoleFailure	Occurs when the role of the local user changes.
onUserNetworkQuality	Reports the network quality of each user.

Local user

Once connected, each RTC connection has its own local user. Apps can get the local user object using IRtcConnection::getLocalUser.

Each local user has two user roles: broadcaster (publisher or subscriber) and audience (subscriber only). The publisher publishes audio and video tracks, while the audience receives them.

Method	Description
setUserRole	Sets the role of the user.
getUserRole	Gets the role of the user.
setAudioEncoderConfiguration	Configures the audio encoder.
publishAudio	Publishes a local audio track to the RTC connection.
unpublishAudio	Stops publishing the local audio track to the RTC connection.
publishVideo	Publishes a local video track to the RTC connection.
unpublishVideo	Stops publishing the local video track to the RTC connection.
subscribeAudio	Subscribes to the audio of a specified remote user in the RTC connection.
subscribeAllAudio	Subscribes to the audio of all remote users in the RTC connection.
unsubscribeAudio	Stops subscribing to the audio of a specified remote user in the RTC connection.
unsubscribeAllAudio	Stops subscribing to the audio of all remote users in the RTC connection.
setPlaybackAudioFrameBeforeMixingParameters	Sets the audio frame parameters for the `onPlaybackAudioFrameBeforeMixing` callback.
registerAudioFrameObserver	Registers an audio frame observer object.
unregisterAudioFrameObserver	Releases the audio frame observer object.
subscribeVideo	Subscribes to the video of a specified remote user in the RTC connection.
subscribeAllVideo	Subscribes to the video of all remote users in the RTC connection.
unsubscribeVideo	Stops subscribing to the video of a specified remote user in the RTC connection.
unsubscribeAllVideo	Stops subscribing to the video of all remote users in the RTC connection.
registerLocalUserObserver	Registers a local user observer object.
unregisterLocalUserObserver	Releases the local user observer object.

Event	Description
onAudioTrackPublishSuccess	Occurs when the local audio track has published.
onLocalAudioTrackStateChanged	Occurs when the state of the local audio track changes.
onLocalAudioTrackStatistics	Reports the statistics of the local audio track.
onRemoteAudioTrackStatistics	Reports the statistics of the remote audio track.
onUserAudioTrackSubscribed	Occurs when the first remote audio frame is received.
onUserAudioTrackStateChanged	Occurs when the state of a remote audio track changes.
onVideoTrackPublishSuccess	Occurs when the local video track is published.
onLocalVideoTrackStateChanged	Occurs when the state of the local video track changes.
onLocalVideoTrackStatistics	Reports the statistics of the local video track.
onUserVideoTrackSubscribed	Occurs when the first remote video frame is received.
onUserVideoTrackStateChanged	Occurs when the state of a remote video track changes.
onRemoteVideoTrackStatistics	Reports the statistics of the remote video track.

Local audio track

A local audio track can be created by createCustomAudioTrack.

After the local audio track is created, you can publish one or multiple local audio tracks using ILocalUser::publishAudio.

Method	Description
setEnabled	Enables or disables the local audio track.
isEnabled	Gets whether the local audio track is enabled.
getState	Gets the state of the local audio.
GetStats	Gets the statistics of the local audio track.
adjustPublishVolume	Adjusts the audio volume for publishing.
getPublishVolume	Gets the current volume for publishing.

Remote audio track

Method	Description
getStatistics	Gets the statistics of the remote audio track.
getState	Gets the state of the remote audio.

Local video track

A local video track can be created by createCustomVideoTrack.

It originates from one video source, for example, the camera capturer, the screen capturer, or a custom video source.

You can publish one or multiple local video tracks through ILocalUser::publishVideo. Each video track has its own video stream.

Method	Description
setEnabled	Enables or disables the local video track.
setVideoEncoderConfiguration	Sets the video encoder configuration.
getState	Gets the state of the local video.

Remote video track

Method	Description
getState	Gets the state of the remote video.
getTrackInfo	Gets the information of the remote video track.
registerVideoEncodedImageReceiver	Registers an `IVideoEncodedImageReceiver` object.
unregisterVideoEncodedImageReceiver	Releases the `IVideoEncodedImageReceiver` object.
addRenderer	Adds a video renderer to the video track.

Media node factory

Use this factory to create audio and video nodes for the audio and video tracks.

Method	Description
createAudioPcmDataSender	Creates a PCM audio data sender.
createAudioEncodedFrameSender	Creates an encoded audio data sender.
createVideoFrameSender	Creates a YUV video frame sender.
createVideoEncodedImageSender	Creates an encoded video image sender.

Audio data sender

Method	Description
sendAudioPcmData	Sends the PCM audio data to the local audio track.
sendEncodedAudioFrame	Sends the encoded audio data to the local audio track.

Video data sender

Method	Description
sendVideoFrame	Sends the YUV video frame to the video track.
sendEncodedVideoImage	Sends the encoded video image to the video track.