Agora Java API Reference for Android

Public Member Functions | List of all members
agora::rtc::IRtcEngineEventHandlerEx Class Reference
Inheritance diagram for agora::rtc::IRtcEngineEventHandlerEx:

## Public Member Functions
virtual const char * | eventHandlerType () const
virtual void | onJoinChannelSuccess (const RtcConnection &connection, int elapsed)
virtual void | onRejoinChannelSuccess (const RtcConnection &connection, int elapsed)
virtual void | onAudioQuality (const RtcConnection &connection, uid_t remoteUid, int quality, unsigned short delay, unsigned short lost) __deprecated
virtual void | onAudioVolumeIndication (const RtcConnection &connection, const AudioVolumeInfo *speakers, unsigned int speakerNumber, int totalVolume)
virtual void | onLeaveChannel (const RtcConnection &connection, const RtcStats &stats)
virtual void | onRtcStats (const RtcConnection &connection, const RtcStats &stats)
virtual void | onNetworkQuality (const RtcConnection &connection, uid_t remoteUid, int txQuality, int rxQuality)
virtual void | onIntraRequestReceived (const RtcConnection &connection)
virtual void | onFirstLocalVideoFramePublished (const RtcConnection &connection, int elapsed)
virtual void | onFirstRemoteVideoDecoded (const RtcConnection &connection, uid_t remoteUid, int width, int height, int elapsed)
virtual void | onVideoSizeChanged (const RtcConnection &connection, VIDEO_SOURCE_TYPE sourceType, uid_t uid, int width, int height, int rotation)
virtual void | onRemoteVideoStateChanged (const RtcConnection &connection, uid_t remoteUid, REMOTE_VIDEO_STATE state, REMOTE_VIDEO_STATE_REASON reason, int elapsed)
virtual void | onFirstRemoteVideoFrame (const RtcConnection &connection, uid_t remoteUid, int width, int height, int elapsed)
virtual void | onUserJoined (const RtcConnection &connection, uid_t remoteUid, int elapsed)
virtual void | onUserOffline (const RtcConnection &connection, uid_t remoteUid, USER_OFFLINE_REASON_TYPE reason)
virtual void | onUserMuteAudio (const RtcConnection &connection, uid_t remoteUid, bool muted) __deprecated
virtual void | onUserMuteVideo (const RtcConnection &connection, uid_t remoteUid, bool muted)
virtual void | onUserEnableVideo (const RtcConnection &connection, uid_t remoteUid, bool enabled)
virtual void | onUserEnableLocalVideo (const RtcConnection &connection, uid_t remoteUid, bool enabled) __deprecated
virtual void | onUserStateChanged (const RtcConnection &connection, uid_t remoteUid, uint32_t state)
virtual void | onLocalAudioStats (const RtcConnection &connection, const LocalAudioStats &stats)
virtual void | onRemoteAudioStats (const RtcConnection &connection, const RemoteAudioStats &stats)
virtual void | onLocalVideoStats (const RtcConnection &connection, const LocalVideoStats &stats)
virtual void | onRemoteVideoStats (const RtcConnection &connection, const RemoteVideoStats &stats)
virtual void | onConnectionLost (const RtcConnection &connection)
virtual void | onConnectionInterrupted (const RtcConnection &connection) __deprecated
virtual void | onConnectionBanned (const RtcConnection &connection)
virtual void | onStreamMessage (const RtcConnection &connection, uid_t remoteUid, int streamId, const char *data, size_t length, uint64_t sentTs)
virtual void | onStreamMessageError (const RtcConnection &connection, uid_t remoteUid, int streamId, int code, int missed, int cached)
virtual void | onRequestToken (const RtcConnection &connection)
virtual void | onLicenseValidationFailure (const RtcConnection &connection, LICENSE_ERROR_TYPE reason)
virtual void | onTokenPrivilegeWillExpire (const RtcConnection &connection, const char *token)
virtual void | onFirstLocalAudioFramePublished (const RtcConnection &connection, int elapsed)
virtual void | onFirstRemoteAudioFrame (const RtcConnection &connection, uid_t userId, int elapsed) __deprecated
virtual void | onFirstRemoteAudioDecoded (const RtcConnection &connection, uid_t uid, int elapsed) __deprecated
virtual void | onLocalAudioStateChanged (const RtcConnection &connection, LOCAL_AUDIO_STREAM_STATE state, LOCAL_AUDIO_STREAM_REASON reason)
virtual void | onRemoteAudioStateChanged (const RtcConnection &connection, uid_t remoteUid, REMOTE_AUDIO_STATE state, REMOTE_AUDIO_STATE_REASON reason, int elapsed)
virtual void | onActiveSpeaker (const RtcConnection &connection, uid_t uid)
virtual void | onClientRoleChanged (const RtcConnection &connection, CLIENT_ROLE_TYPE oldRole, CLIENT_ROLE_TYPE newRole, const ClientRoleOptions &newRoleOptions)
virtual void | onClientRoleChangeFailed (const RtcConnection &connection, CLIENT_ROLE_CHANGE_FAILED_REASON reason, CLIENT_ROLE_TYPE currentRole)
virtual void | onRemoteAudioTransportStats (const RtcConnection &connection, uid_t remoteUid, unsigned short delay, unsigned short lost, unsigned short rxKBitRate) __deprecated
virtual void | onRemoteVideoTransportStats (const RtcConnection &connection, uid_t remoteUid, unsigned short delay, unsigned short lost, unsigned short rxKBitRate) __deprecated
virtual void | onConnectionStateChanged (const RtcConnection &connection, CONNECTION_STATE_TYPE state, CONNECTION_CHANGED_REASON_TYPE reason)
virtual void | onWlAccMessage (const RtcConnection &connection, WLACC_MESSAGE_REASON reason, WLACC_SUGGEST_ACTION action, const char *wlAccMsg)
virtual void | onWlAccStats (const RtcConnection &connection, WlAccStats currentStats, WlAccStats averageStats)
virtual void | onNetworkTypeChanged (const RtcConnection &connection, NETWORK_TYPE type)
virtual void | onEncryptionError (const RtcConnection &connection, ENCRYPTION_ERROR_TYPE errorType)
virtual void | onUploadLogResult (const RtcConnection &connection, const char *requestId, bool success, UPLOAD_ERROR_REASON reason)
virtual void | onUserAccountUpdated (const RtcConnection &connection, uid_t remoteUid, const char *remoteUserAccount)
virtual void | onSnapshotTaken (const RtcConnection &connection, uid_t uid, const char *filePath, int width, int height, int errCode)
virtual void | onVideoRenderingTracingResult (const RtcConnection &connection, uid_t uid, MEDIA_TRACE_EVENT currentEvent, VideoRenderingTracingInfo tracingInfo)
virtual void | onSetRtmFlagResult (const RtcConnection &connection, int code)
virtual void | onTranscodedStreamLayoutInfo (const RtcConnection &connection, uid_t uid, int width, int height, int layoutCount, const VideoLayout *layoutlist)
virtual void | onAudioMetadataReceived (const RtcConnection &connection, uid_t uid, const char *metadata, size_t length)
virtual const char * | eventHandlerType () const
virtual void | onJoinChannelSuccess (const char *channel, uid_t uid, int elapsed)
virtual void | onRejoinChannelSuccess (const char *channel, uid_t uid, int elapsed)
virtual void | onAudioQuality (uid_t uid, int quality, unsigned short delay, unsigned short lost) __deprecated
virtual void | onAudioVolumeIndication (const AudioVolumeInfo *speakers, unsigned int speakerNumber, int totalVolume)
virtual void | onLeaveChannel (const RtcStats &stats)
virtual void | onRtcStats (const RtcStats &stats)
virtual void | onNetworkQuality (uid_t uid, int txQuality, int rxQuality)
virtual void | onIntraRequestReceived ()
virtual void | onFirstLocalVideoFramePublished (VIDEO_SOURCE_TYPE source, int elapsed)
virtual void | onFirstRemoteVideoDecoded (uid_t uid, int width, int height, int elapsed) __deprecated
virtual void | onVideoSizeChanged (VIDEO_SOURCE_TYPE sourceType, uid_t uid, int width, int height, int rotation)
virtual void | onLocalVideoStateChanged (VIDEO_SOURCE_TYPE source, LOCAL_VIDEO_STREAM_STATE state, LOCAL_VIDEO_STREAM_REASON reason)
virtual void | onRemoteVideoStateChanged (uid_t uid, REMOTE_VIDEO_STATE state, REMOTE_VIDEO_STATE_REASON reason, int elapsed)
virtual void | onFirstRemoteVideoFrame (uid_t uid, int width, int height, int elapsed)
virtual void | onUserJoined (uid_t uid, int elapsed)
virtual void | onUserOffline (uid_t uid, USER_OFFLINE_REASON_TYPE reason)
virtual void | onUserMuteAudio (uid_t uid, bool muted)
virtual void | onUserMuteVideo (uid_t uid, bool muted)
virtual void | onUserEnableVideo (uid_t uid, bool enabled)
virtual void | onUserEnableLocalVideo (uid_t uid, bool enabled) __deprecated
virtual void | onUserStateChanged (uid_t uid, REMOTE_USER_STATE state)
virtual void | onLocalAudioStats (const LocalAudioStats &stats)
virtual void | onRemoteAudioStats (const RemoteAudioStats &stats)
virtual void | onLocalVideoStats (VIDEO_SOURCE_TYPE source, const LocalVideoStats &stats)
virtual void | onRemoteVideoStats (const RemoteVideoStats &stats)
virtual void | onConnectionLost ()
virtual void | onConnectionInterrupted () __deprecated
virtual void | onConnectionBanned () __deprecated
virtual void | onStreamMessage (uid_t uid, int streamId, const char *data, size_t length, uint64_t sentTs)
virtual void | onStreamMessageError (uid_t uid, int streamId, int code, int missed, int cached)
virtual void | onRequestToken ()
virtual void | onTokenPrivilegeWillExpire (const char *token)
virtual void | onLicenseValidationFailure (LICENSE_ERROR_TYPE error)
virtual void | onFirstLocalAudioFramePublished (int elapsed)
virtual void | onFirstRemoteAudioFrame (uid_t uid, int elapsed) __deprecated
virtual void | onFirstRemoteAudioDecoded (uid_t uid, int elapsed) __deprecated
virtual void | onLocalAudioStateChanged (LOCAL_AUDIO_STREAM_STATE state, LOCAL_AUDIO_STREAM_REASON reason)
virtual void | onRemoteAudioStateChanged (uid_t uid, REMOTE_AUDIO_STATE state, REMOTE_AUDIO_STATE_REASON reason, int elapsed)
virtual void | onActiveSpeaker (uid_t uid)
virtual void | onClientRoleChanged (CLIENT_ROLE_TYPE oldRole, CLIENT_ROLE_TYPE newRole, const ClientRoleOptions &newRoleOptions)
virtual void | onClientRoleChangeFailed (CLIENT_ROLE_CHANGE_FAILED_REASON reason, CLIENT_ROLE_TYPE currentRole)
virtual void | onRemoteAudioTransportStats (uid_t uid, unsigned short delay, unsigned short lost, unsigned short rxKBitRate) __deprecated
virtual void | onRemoteVideoTransportStats (uid_t uid, unsigned short delay, unsigned short lost, unsigned short rxKBitRate) __deprecated
virtual void | onConnectionStateChanged (CONNECTION_STATE_TYPE state, CONNECTION_CHANGED_REASON_TYPE reason)
virtual void | onWlAccMessage (WLACC_MESSAGE_REASON reason, WLACC_SUGGEST_ACTION action, const char *wlAccMsg)
virtual void | onWlAccStats (const WlAccStats &currentStats, const WlAccStats &averageStats)
virtual void | onNetworkTypeChanged (NETWORK_TYPE type)
virtual void | onEncryptionError (ENCRYPTION_ERROR_TYPE errorType)
virtual void | onUploadLogResult (const char *requestId, bool success, UPLOAD_ERROR_REASON reason)
virtual void | onUserInfoUpdated (uid_t uid, const UserInfo &info)
virtual void | onUserAccountUpdated (uid_t uid, const char *userAccount)
virtual void | onAudioSubscribeStateChanged (const char *channel, uid_t uid, STREAM_SUBSCRIBE_STATE oldState, STREAM_SUBSCRIBE_STATE newState, int elapseSinceLastState)
virtual void | onVideoSubscribeStateChanged (const char *channel, uid_t uid, STREAM_SUBSCRIBE_STATE oldState, STREAM_SUBSCRIBE_STATE newState, int elapseSinceLastState)
virtual void | onAudioPublishStateChanged (const char *channel, STREAM_PUBLISH_STATE oldState, STREAM_PUBLISH_STATE newState, int elapseSinceLastState)
virtual void | onVideoPublishStateChanged (VIDEO_SOURCE_TYPE source, const char *channel, STREAM_PUBLISH_STATE oldState, STREAM_PUBLISH_STATE newState, int elapseSinceLastState)
virtual void | onSnapshotTaken (uid_t uid, const char *filePath, int width, int height, int errCode)
virtual void | onVideoRenderingTracingResult (uid_t uid, MEDIA_TRACE_EVENT currentEvent, VideoRenderingTracingInfo tracingInfo)
virtual void | onSetRtmFlagResult (int code)
virtual void | onTranscodedStreamLayoutInfo (uid_t uid, int width, int height, int layoutCount, const VideoLayout *layoutlist)
virtual void | onAudioMetadataReceived (uid_t uid, const char *metadata, size_t length)
Public Member Functions inherited from agora::rtc::IRtcEngineEventHandler
virtual void | onJoinChannelSuccess (const char *channel, uid_t uid, int elapsed)
virtual void | onRejoinChannelSuccess (const char *channel, uid_t uid, int elapsed)
virtual void | onProxyConnected (const char *channel, uid_t uid, PROXY_TYPE proxyType, const char *localProxyIp, int elapsed)
virtual void | onError (int err, const char *msg)
virtual void | onAudioQuality (uid_t uid, int quality, unsigned short delay, unsigned short lost) __deprecated
virtual void | onLastmileProbeResult (const LastmileProbeResult &result)
virtual void | onAudioVolumeIndication (const AudioVolumeInfo *speakers, unsigned int speakerNumber, int totalVolume)
virtual void | onLeaveChannel (const RtcStats &stats)
virtual void | onRtcStats (const RtcStats &stats)
virtual void | onAudioDeviceStateChanged (const char *deviceId, int deviceType, int deviceState)
virtual void | onAudioMixingPositionChanged (int64_t position)
| Reports current AudioMixing progress. More...
virtual void | onAudioMixingFinished () __deprecated
virtual void | onAudioEffectFinished (int soundId)
virtual void | onVideoDeviceStateChanged (const char *deviceId, int deviceType, int deviceState)
virtual void | onNetworkQuality (uid_t uid, int txQuality, int rxQuality)
virtual void | onIntraRequestReceived ()
virtual void | onUplinkNetworkInfoUpdated (const UplinkNetworkInfo &info)
virtual void | onDownlinkNetworkInfoUpdated (const DownlinkNetworkInfo &info)
virtual void | onLastmileQuality (int quality)
virtual void | onFirstLocalVideoFrame (VIDEO_SOURCE_TYPE source, int width, int height, int elapsed)
virtual void | onFirstLocalVideoFramePublished (VIDEO_SOURCE_TYPE source, int elapsed)
virtual void | onFirstRemoteVideoDecoded (uid_t uid, int width, int height, int elapsed) __deprecated
virtual void | onVideoSizeChanged (VIDEO_SOURCE_TYPE sourceType, uid_t uid, int width, int height, int rotation)
virtual void | onLocalVideoStateChanged (VIDEO_SOURCE_TYPE source, LOCAL_VIDEO_STREAM_STATE state, LOCAL_VIDEO_STREAM_REASON reason)
virtual void | onRemoteVideoStateChanged (uid_t uid, REMOTE_VIDEO_STATE state, REMOTE_VIDEO_STATE_REASON reason, int elapsed)
virtual void | onFirstRemoteVideoFrame (uid_t uid, int width, int height, int elapsed)
virtual void | onUserJoined (uid_t uid, int elapsed)
virtual void | onUserOffline (uid_t uid, USER_OFFLINE_REASON_TYPE reason)
virtual void | onUserMuteAudio (uid_t uid, bool muted)
virtual void | onUserMuteVideo (uid_t uid, bool muted)
virtual void | onUserEnableVideo (uid_t uid, bool enabled)
virtual void | onUserStateChanged (uid_t uid, REMOTE_USER_STATE state)
virtual void | onUserEnableLocalVideo (uid_t uid, bool enabled) __deprecated
virtual void | onRemoteAudioStats (const RemoteAudioStats &stats)
virtual void | onLocalAudioStats (const LocalAudioStats &stats)
virtual void | onLocalVideoStats (VIDEO_SOURCE_TYPE source, const LocalVideoStats &stats)
virtual void | onRemoteVideoStats (const RemoteVideoStats &stats)
virtual void | onCameraReady () __deprecated
virtual void | onCameraFocusAreaChanged (int x, int y, int width, int height)
virtual void | onCameraExposureAreaChanged (int x, int y, int width, int height)
virtual void | onVideoStopped () __deprecated
virtual void | onAudioMixingStateChanged (AUDIO_MIXING_STATE_TYPE state, AUDIO_MIXING_REASON_TYPE reason)
virtual void | onRhythmPlayerStateChanged (RHYTHM_PLAYER_STATE_TYPE state, RHYTHM_PLAYER_REASON reason)
virtual void | onConnectionLost ()
virtual void | onConnectionInterrupted () __deprecated
virtual void | onConnectionBanned () __deprecated
virtual void | onStreamMessage (uid_t uid, int streamId, const char *data, size_t length, uint64_t sentTs)
virtual void | onStreamMessageError (uid_t uid, int streamId, int code, int missed, int cached)
virtual void | onRequestToken ()
virtual void | onTokenPrivilegeWillExpire (const char *token)
virtual void | onLicenseValidationFailure (LICENSE_ERROR_TYPE error)
virtual void | onFirstLocalAudioFramePublished (int elapsed)
virtual void | onFirstRemoteAudioDecoded (uid_t uid, int elapsed) __deprecated
virtual void | onFirstRemoteAudioFrame (uid_t uid, int elapsed) __deprecated
virtual void | onLocalAudioStateChanged (LOCAL_AUDIO_STREAM_STATE state, LOCAL_AUDIO_STREAM_REASON reason)
virtual void | onRemoteAudioStateChanged (uid_t uid, REMOTE_AUDIO_STATE state, REMOTE_AUDIO_STATE_REASON reason, int elapsed)
virtual void | onActiveSpeaker (uid_t uid)
virtual void | onContentInspectResult (media::CONTENT_INSPECT_RESULT result)
virtual void | onSnapshotTaken (uid_t uid, const char *filePath, int width, int height, int errCode)
virtual void | onClientRoleChanged (CLIENT_ROLE_TYPE oldRole, CLIENT_ROLE_TYPE newRole, const ClientRoleOptions &newRoleOptions)
virtual void | onClientRoleChangeFailed (CLIENT_ROLE_CHANGE_FAILED_REASON reason, CLIENT_ROLE_TYPE currentRole)
virtual void | onAudioDeviceVolumeChanged (MEDIA_DEVICE_TYPE deviceType, int volume, bool muted)
virtual void | onRtmpStreamingStateChanged (const char *url, RTMP_STREAM_PUBLISH_STATE state, RTMP_STREAM_PUBLISH_REASON reason)
virtual void | onRtmpStreamingEvent (const char *url, RTMP_STREAMING_EVENT eventCode)
virtual void | onTranscodingUpdated ()
virtual void | onAudioRoutingChanged (int routing)
virtual void | onChannelMediaRelayStateChanged (int state, int code)
virtual void | onLocalPublishFallbackToAudioOnly (bool isFallbackOrRecover)
virtual void | onRemoteSubscribeFallbackToAudioOnly (uid_t uid, bool isFallbackOrRecover)
virtual void | onRemoteAudioTransportStats (uid_t uid, unsigned short delay, unsigned short lost, unsigned short rxKBitRate) __deprecated
virtual void | onRemoteVideoTransportStats (uid_t uid, unsigned short delay, unsigned short lost, unsigned short rxKBitRate) __deprecated
virtual void | onConnectionStateChanged (CONNECTION_STATE_TYPE state, CONNECTION_CHANGED_REASON_TYPE reason)
virtual void | onWlAccMessage (WLACC_MESSAGE_REASON reason, WLACC_SUGGEST_ACTION action, const char *wlAccMsg)
virtual void | onWlAccStats (const WlAccStats &currentStats, const WlAccStats &averageStats)
virtual void | onNetworkTypeChanged (NETWORK_TYPE type)
virtual void | onEncryptionError (ENCRYPTION_ERROR_TYPE errorType)
virtual void | onPermissionError (PERMISSION_TYPE permissionType)
virtual void | onLocalUserRegistered (uid_t uid, const char *userAccount)
virtual void | onUserInfoUpdated (uid_t uid, const UserInfo &info)
virtual void | onUserAccountUpdated (uid_t uid, const char *userAccount)
virtual void | onVideoRenderingTracingResult (uid_t uid, MEDIA_TRACE_EVENT currentEvent, VideoRenderingTracingInfo tracingInfo)
virtual void | onLocalVideoTranscoderError (const TranscodingVideoStream &stream, VIDEO_TRANSCODER_ERROR error)
virtual void | onUploadLogResult (const char *requestId, bool success, UPLOAD_ERROR_REASON reason)
virtual void | onAudioSubscribeStateChanged (const char *channel, uid_t uid, STREAM_SUBSCRIBE_STATE oldState, STREAM_SUBSCRIBE_STATE newState, int elapseSinceLastState)
virtual void | onVideoSubscribeStateChanged (const char *channel, uid_t uid, STREAM_SUBSCRIBE_STATE oldState, STREAM_SUBSCRIBE_STATE newState, int elapseSinceLastState)
virtual void | onAudioPublishStateChanged (const char *channel, STREAM_PUBLISH_STATE oldState, STREAM_PUBLISH_STATE newState, int elapseSinceLastState)
virtual void | onVideoPublishStateChanged (VIDEO_SOURCE_TYPE source, const char *channel, STREAM_PUBLISH_STATE oldState, STREAM_PUBLISH_STATE newState, int elapseSinceLastState)
virtual void | onTranscodedStreamLayoutInfo (uid_t uid, int width, int height, int layoutCount, const VideoLayout *layoutlist)
virtual void | onAudioMetadataReceived (uid_t uid, const char *metadata, size_t length)
virtual void | onExtensionEventWithContext (const ExtensionContext &context, const char *key, const char *value)
virtual void | onExtensionStartedWithContext (const ExtensionContext &context)
virtual void | onExtensionStoppedWithContext (const ExtensionContext &context)
virtual void | onExtensionErrorWithContext (const ExtensionContext &context, int error, const char *message)
virtual void | onSetRtmFlagResult (int code)

## Member Function Documentation

## ◆ onJoinChannelSuccess() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onJoinChannelSuccess | ( | const RtcConnection & | connection,
|  | int | elapsed
| ) |  |
| virtual

Occurs when a user joins a channel.

This callback notifies the application that a user joins a specified channel.

Parameters

  connection | The RtcConnection object.
  elapsed | The time elapsed (ms) from the local user calling joinChannel until the SDK triggers this callback.

## ◆ onRejoinChannelSuccess() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRejoinChannelSuccess | ( | const RtcConnection & | connection,
|  | int | elapsed
| ) |  |
| virtual

Occurs when a user rejoins the channel.

When a user loses connection with the server because of network problems, the SDK automatically tries to reconnect and triggers this callback upon reconnection.

Parameters

  connection | The RtcConnection object.
  elapsed | Time elapsed (ms) from the local user calling the joinChannel method until this callback is triggered.

## ◆ onAudioQuality() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onAudioQuality | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | int | quality,
|  | unsigned short | delay,
|  | unsigned short | lost
| ) |  |
| virtual

Reports the statistics of the audio stream from each remote user/broadcaster.

Deprecated:
  This callback is deprecated. Use onRemoteAudioStats instead.

The SDK triggers this callback once every two seconds to report the audio quality of each remote user/host sending an audio stream. If a channel has multiple remote users/hosts sending audio streams, the SDK triggers this callback as many times.

Parameters

  connection | The RtcConnection object.
  remoteUid | The user ID of the remote user sending the audio stream.
  quality | The audio quality of the user: #QUALITY_TYPE
  delay | The network delay (ms) from the sender to the receiver, including the delay caused by audio sampling pre-processing, network transmission, and network jitter buffering.
  lost | The audio packet loss rate (%) from the sender to the receiver.

## ◆ onAudioVolumeIndication() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onAudioVolumeIndication | ( | const RtcConnection & | connection,
|  | const AudioVolumeInfo * | speakers,
|  | unsigned int | speakerNumber,
|  | int | totalVolume
| ) |  |
| virtual

Reports the volume information of users.

By default, this callback is disabled. You can enable it by calling `enableAudioVolumeIndication`. Once this callback is enabled and users send streams in the channel, the SDK triggers the `onAudioVolumeIndication` callback at the time interval set in `enableAudioVolumeIndication`. The SDK triggers two independent `onAudioVolumeIndication` callbacks simultaneously, which separately report the volume information of the local user who sends a stream and the remote users (up to three) whose instantaneous volume is the highest.

Note
  After you enable this callback, calling muteLocalAudioStream affects the SDK's behavior as follows:
  - If the local user stops publishing the audio stream, the SDK stops triggering the local user's callback.
  - 20 seconds after a remote user whose volume is one of the three highest stops publishing the audio stream, the callback excludes this user's information; 20 seconds after all remote users stop publishing audio streams, the SDK stops triggering the callback for remote users.

Parameters

  connection | The RtcConnection object.
  speakers | The volume information of the users, see AudioVolumeInfo. An empty `speakers` array in the callback indicates that no remote user is in the channel or sending a stream at the moment.
  speakerNumber | The total number of speakers. In the local user's callback, when the local user sends a stream, `speakerNumber` is 1. In the callback for remote users, the value range of speakerNumber is [0,3]. If the number of remote users who send streams is greater than or equal to three, the value of `speakerNumber` is 3.
  totalVolume | The volume of the speaker. The value ranges between 0 (lowest volume) and 255 (highest volume). In the local user's callback, `totalVolume` is the volume of the local user who sends a stream. In the remote users' callback, `totalVolume` is the sum of all remote users (up to three) whose instantaneous volume is the highest. If the user calls `startAudioMixing`, `totalVolume` is the volume after audio mixing.

## ◆ onLeaveChannel() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onLeaveChannel | ( | const RtcConnection & | connection,
|  | const RtcStats & | stats
| ) |  |
| virtual

Occurs when a user leaves a channel.

This callback notifies the app that the user leaves the channel by calling `leaveChannel`. From this callback, the app can get information such as the call duration and quality statistics.

Parameters

  connection | The RtcConnection object.
  stats | The statistics on the call: RtcStats.

## ◆ onRtcStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRtcStats | ( | const RtcConnection & | connection,
|  | const RtcStats & | stats
| ) |  |
| virtual

Reports the statistics of the current call.

The SDK triggers this callback once every two seconds after the user joins the channel.

Parameters

  connection | The RtcConnection object.
  stats | The statistics of the current call: RtcStats.

## ◆ onNetworkQuality() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onNetworkQuality | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | int | txQuality,
|  | int | rxQuality
| ) |  |
| virtual

Reports the last mile network quality of each user in the channel.

This callback reports the last mile network conditions of each user in the channel. Last mile refers to the connection between the local device and Agora's edge server.

The SDK triggers this callback once every two seconds. If a channel includes multiple users, the SDK triggers this callback as many times.

Note
  `txQuality` is UNKNOWN when the user is not sending a stream; `rxQuality` is UNKNOWN when the user is not receiving a stream.

Parameters

  connection | The RtcConnection object.
  remoteUid | The user ID. The network quality of the user with this user ID is reported.
  txQuality | Uplink network quality rating of the user in terms of the transmission bit rate, packet loss rate, average RTT (Round-Trip Time) and jitter of the uplink network. This parameter is a quality rating helping you understand how well the current uplink network conditions can support the selected video encoder configuration. For example, a 1000 Kbps uplink network may be adequate for video frames with a resolution of 640 × 480 and a frame rate of 15 fps in the LIVE_BROADCASTING profile, but may be inadequate for resolutions higher than 1280 × 720. See #QUALITY_TYPE.
  rxQuality | Downlink network quality rating of the user in terms of packet loss rate, average RTT, and jitter of the downlink network. See #QUALITY_TYPE.

## ◆ onIntraRequestReceived() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onIntraRequestReceived | ( | const RtcConnection & | connection | ) |
| virtual

Occurs when intra request from remote user is received.

This callback is triggered once remote user needs one Key frame.

Parameters

  connection | The RtcConnection object.

## ◆ onFirstLocalVideoFramePublished() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onFirstLocalVideoFramePublished | ( | const RtcConnection & | connection,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the first local video frame is published. The SDK triggers this callback under one of the following circumstances:

- The local client enables the video module and calls `joinChannel` successfully.
- The local client calls `muteLocalVideoStream(true)` and muteLocalVideoStream(false) in sequence.
- The local client calls `disableVideo` and `enableVideo` in sequence.
- The local client calls `pushVideoFrame` to successfully push the video frame to the SDK.

Parameters

  connection | The RtcConnection object.
  elapsed | The time elapsed (ms) from the local user calling joinChannel` to the SDK triggers this callback.

## ◆ onFirstRemoteVideoDecoded() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onFirstRemoteVideoDecoded | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | int | width,
|  | int | height,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the first remote video frame is received and decoded.

The SDK triggers this callback under one of the following circumstances:

- The remote user joins the channel and sends the video stream.
- The remote user stops sending the video stream and re-sends it after 15 seconds. Reasons for such an interruption include:
  - The remote user leaves the channel.
  - The remote user drops offline.
  - The remote user calls `muteLocalVideoStream` to stop sending the video stream.
  - The remote user calls `disableVideo` to disable video.

Parameters

  connection | The RtcConnection object.
  remoteUid | The user ID of the remote user sending the video stream.
  width | The width (pixels) of the video stream.
  height | The height (pixels) of the video stream.
  elapsed | The time elapsed (ms) from the local user calling `joinChannel` until the SDK triggers this callback.

## ◆ onVideoSizeChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onVideoSizeChanged | ( | const RtcConnection & | connection,
|  | VIDEO_SOURCE_TYPE | sourceType,
|  | uid_t | uid,
|  | int | width,
|  | int | height,
|  | int | rotation
| ) |  |
| virtual

Occurs when the local or remote video size or rotation has changed.

Parameters

  connection | The RtcConnection object.
  sourceType | The video source type: #VIDEO_SOURCE_TYPE.
  uid | The user ID. 0 indicates the local user.
  width | The new width (pixels) of the video.
  height | The new height (pixels) of the video.
  rotation | The rotation information of the video.

## ◆ onRemoteVideoStateChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRemoteVideoStateChanged | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | REMOTE_VIDEO_STATE | state,
|  | REMOTE_VIDEO_STATE_REASON | reason,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the remote video state changes.

Note
  This callback does not work properly when the number of users (in the voice/video call channel) or hosts (in the live streaming channel) in the channel exceeds 17.

Parameters

  connection | The RtcConnection object.
  remoteUid | The ID of the user whose video state has changed.
  state | The remote video state: #REMOTE_VIDEO_STATE.
  reason | The reason of the remote video state change: #REMOTE_VIDEO_STATE_REASON.
  elapsed | The time elapsed (ms) from the local client calling `joinChannel` until this callback is triggered.

## ◆ onFirstRemoteVideoFrame() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onFirstRemoteVideoFrame | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | int | width,
|  | int | height,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the renderer receives the first frame of the remote video.

Parameters

  connection | The RtcConnection object.
  remoteUid | The user ID of the remote user sending the video stream.
  width | The width (px) of the video frame.
  height | The height (px) of the video stream.
  elapsed | The time elapsed (ms) from the local user calling `joinChannel` until the SDK triggers this callback.

## ◆ onUserJoined() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserJoined | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | int | elapsed
| ) |  |
| virtual

Occurs when a remote user or broadcaster joins the channel.

- In the COMMUNICATION channel profile, this callback indicates that a remote user joins the channel. The SDK also triggers this callback to report the existing users in the channel when a user joins the channel. In the LIVE_BROADCASTING channel profile, this callback indicates that a host joins the channel. The SDK also triggers this callback to report the existing hosts in the channel when a host joins the channel. Agora recommends limiting the number of hosts to 17.

The SDK triggers this callback under one of the following circumstances:

- A remote user/host joins the channel by calling the `joinChannel` method.
- A remote user switches the user role to the host after joining the channel.
- A remote user/host rejoins the channel after a network interruption.

Parameters

  connection | The RtcConnection object.
  remoteUid | The ID of the remote user or broadcaster joining the channel.
  elapsed | The time elapsed (ms) from the local user calling `joinChannel` or `setClientRole` until this callback is triggered.

## ◆ onUserOffline() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserOffline | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | USER_OFFLINE_REASON_TYPE | reason
| ) |  |
| virtual

Occurs when a remote user or broadcaster goes offline.

There are two reasons for a user to go offline:

- Leave the channel: When the user leaves the channel, the user sends a goodbye message. When this message is received, the SDK determines that the user leaves the channel.
- Drop offline: When no data packet of the user is received for a certain period of time, the SDK assumes that the user drops offline. A poor network connection may lead to false detection, so we recommend using the RTM SDK for reliable offline detection.
- The user switches the user role from a broadcaster to an audience.

Parameters

  connection | The RtcConnection object.
  remoteUid | The ID of the remote user or broadcaster who leaves the channel or drops offline.
  reason | The reason why the remote user goes offline: #USER_OFFLINE_REASON_TYPE.

## ◆ onUserMuteAudio() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserMuteAudio | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | bool | muted
| ) |  |
| virtual

Occurs when a remote user's audio stream playback pauses/resumes. The SDK triggers this callback when the remote user stops or resumes sending the audio stream by calling the `muteLocalAudioStream` method.

Note
  This callback can be inaccurate when the number of users (in the `COMMUNICATION` profile) or hosts (in the `LIVE_BROADCASTING` profile) in the channel exceeds 17.

Parameters

  connection | The RtcConnection object.
  remoteUid | The user ID.
  muted | Whether the remote user's audio stream is muted/unmuted: true: Muted. false: Unmuted.

## ◆ onUserMuteVideo() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserMuteVideo | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | bool | muted
| ) |  |
| virtual

Occurs when a remote user pauses or resumes sending the video stream.

When a remote user calls `muteLocalVideoStream` to stop or resume publishing the video stream, the SDK triggers this callback to report the state of the remote user's publishing stream to the local user.

Note
  This callback can be inaccurate when the number of users or broadacasters in a channel exceeds 20.

Parameters

  connection | The RtcConnection object.
  remoteUid | ID of the remote user.
  muted | Whether the remote user stops publishing the video stream: true: The remote user has paused sending the video stream. false: The remote user has resumed sending the video stream.

## ◆ onUserEnableVideo() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserEnableVideo | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | bool | enabled
| ) |  |
| virtual

Occurs when a remote user enables or disables the video module.

Once the video function is disabled, the users cannot see any video.

The SDK triggers this callback when a remote user enables or disables the video module by calling the `enableVideo` or `disableVideo` method.

Parameters

  connection | The RtcConnection object.
  remoteUid | The ID of the remote user.
  enabled | Whether the video of the remote user is enabled: true: The remote user has enabled video. false: The remote user has disabled video.

## ◆ onUserEnableLocalVideo() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserEnableLocalVideo | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | bool | enabled
| ) |  |
| virtual

Occurs when a remote user enables or disables local video capturing.

The SDK triggers this callback when the remote user resumes or stops capturing the video stream by calling the `enableLocalVideo` method.

Parameters

  connection | The RtcConnection object.
  remoteUid | The ID of the remote user.
  enabled | Whether the specified remote user enables/disables local video: `true`: The remote user has enabled local video capturing. `false`: The remote user has disabled local video capturing.

## ◆ onUserStateChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserStateChanged | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | uint32_t | state
| ) |  |
| virtual

Occurs when the remote user state is updated.

Parameters

  connection | The RtcConnection object.
  remoteUid | The uid of the remote user.
  state | The remote user state: #REMOTE_USER_STATE.

## ◆ onLocalAudioStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onLocalAudioStats | ( | const RtcConnection & | connection,
|  | const LocalAudioStats & | stats
| ) |  |
| virtual

Reports the statistics of the local audio stream.

The SDK triggers this callback once every two seconds.

Parameters

  connection | The RtcConnection object.
  stats | The statistics of the local audio stream. See LocalAudioStats.

## ◆ onRemoteAudioStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRemoteAudioStats | ( | const RtcConnection & | connection,
|  | const RemoteAudioStats & | stats
| ) |  |
| virtual

Reports the statistics of the audio stream from each remote user/host.

The SDK triggers this callback once every two seconds for each remote user who is sending audio streams. If a channel includes multiple remote users, the SDK triggers this callback as many times.

Parameters

  connection | The RtcConnection object.
  stats | Statistics of the received remote audio streams. See RemoteAudioStats.

## ◆ onLocalVideoStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onLocalVideoStats | ( | const RtcConnection & | connection,
|  | const LocalVideoStats & | stats
| ) |  |
| virtual

Reports the statistics of the local video stream.

The SDK triggers this callback once every two seconds for each user/host. If there are multiple users/hosts in the channel, the SDK triggers this callback as many times.

Note
  If you have called the `enableDualStreamMode` method, this callback reports the statistics of the high-video stream (high bitrate, and high-resolution video stream).

Parameters

  connection | The RtcConnection object.
  stats | Statistics of the local video stream. See LocalVideoStats.

## ◆ onRemoteVideoStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRemoteVideoStats | ( | const RtcConnection & | connection,
|  | const RemoteVideoStats & | stats
| ) |  |
| virtual

Reports the statistics of the video stream from each remote user/host.

The SDK triggers this callback once every two seconds for each remote user. If a channel has multiple users/hosts sending video streams, the SDK triggers this callback as many times.

Parameters

  connection | The RtcConnection object.
  stats | Statistics of the remote video stream. See RemoteVideoStats.

## ◆ onConnectionLost() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onConnectionLost | ( | const RtcConnection & | connection | ) |
| virtual

Occurs when the SDK cannot reconnect to the server 10 seconds after its connection to the server is interrupted.

The SDK triggers this callback when it cannot connect to the server 10 seconds after calling `joinChannel`, regardless of whether it is in the channel or not. If the SDK fails to rejoin the channel 20 minutes after being disconnected from Agora's edge server, the SDK stops rejoining the channel.

Parameters

  connection | The RtcConnection object.

## ◆ onConnectionInterrupted() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onConnectionInterrupted | ( | const RtcConnection & | connection | ) |
| virtual

Occurs when the connection between the SDK and the server is interrupted.

Deprecated:
  Use `onConnectionStateChanged` instead.

The SDK triggers this callback when it loses connection with the serer for more than 4 seconds after the connection is established. After triggering this callback, the SDK tries to reconnect to the server. If the reconnection fails within a certain period (10 seconds by default), the onConnectionLost() callback is triggered. If the SDK fails to rejoin the channel 20 minutes after being disconnected from Agora's edge server, the SDK stops rejoining the channel.

Parameters

  connection | The RtcConnection object.

## ◆ onConnectionBanned() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onConnectionBanned | ( | const RtcConnection & | connection | ) |
| virtual

Occurs when your connection is banned by the Agora Server.

Parameters

  connection | The RtcConnection object.

## ◆ onStreamMessage() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onStreamMessage | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | int | streamId,
|  | const char * | data,
|  | size_t | length,
|  | uint64_t | sentTs
| ) |  |
| virtual

Occurs when the local user receives the data stream from the remote user.

The SDK triggers this callback when the user receives the data stream that another user sends by calling the sendStreamMessage method.

Parameters

  connection | The RtcConnection object.
  remoteUid | ID of the user who sends the data stream.
  streamId | The ID of the stream data.
  data | The data stream.
  length | The length (byte) of the data stream.
  sentTs | The time when the data stream sent.

## ◆ onStreamMessageError() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onStreamMessageError | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | int | streamId,
|  | int | code,
|  | int | missed,
|  | int | cached
| ) |  |
| virtual

Occurs when the local user does not receive the data stream from the remote user.

The SDK triggers this callback when the user fails to receive the data stream that another user sends by calling the sendStreamMessage method.

Parameters

  connection | The RtcConnection object.
  remoteUid | ID of the user who sends the data stream.
  streamId | The ID of the stream data.
  code | The error code.
  missed | The number of lost messages.
  cached | The number of incoming cached messages when the data stream is interrupted.

## ◆ onRequestToken() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRequestToken | ( | const RtcConnection & | connection | ) |
| virtual

Occurs when the token expires.

When the token expires during a call, the SDK triggers this callback to remind the app to renew the token.

Upon receiving this callback, generate a new token at your app server and call `joinChannel` to pass the new token to the SDK.

Parameters

  connection | The RtcConnection object.

## ◆ onLicenseValidationFailure() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onLicenseValidationFailure | ( | const RtcConnection & | connection,
|  | LICENSE_ERROR_TYPE | reason
| ) |  |
| virtual

Occurs when connection license verification fails.

You can know the reason accordding to error code

## ◆ onTokenPrivilegeWillExpire() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onTokenPrivilegeWillExpire | ( | const RtcConnection & | connection,
|  | const char * | token
| ) |  |
| virtual

Occurs when the token will expire in 30 seconds.

When the token is about to expire in 30 seconds, the SDK triggers this callback to remind the app to renew the token.

Upon receiving this callback, generate a new token at your app server and call renewToken to pass the new Token to the SDK.

Parameters

  connection | The RtcConnection object.
  token | The token that will expire in 30 seconds.

## ◆ onFirstLocalAudioFramePublished() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onFirstLocalAudioFramePublished | ( | const RtcConnection & | connection,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the first local audio frame is published.

The SDK triggers this callback under one of the following circumstances:

- The local client enables the audio module and calls `joinChannel` successfully.
- The local client calls `muteLocalAudioStream(true)` and `muteLocalAudioStream(false)` in sequence.
- The local client calls `disableAudio` and `enableAudio` in sequence.
- The local client calls `pushAudioFrame` to successfully push the audio frame to the SDK.

Parameters

  connection | The RtcConnection object.
  elapsed | The time elapsed (ms) from the local user calling `joinChannel` to the SDK triggers this callback.

## ◆ onFirstRemoteAudioFrame() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onFirstRemoteAudioFrame | ( | const RtcConnection & | connection,
|  | uid_t | userId,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the SDK receives the first audio frame from a specific remote user.

Deprecated:
  Use `onRemoteAudioStateChanged` instead.

Parameters

  connection | The RtcConnection object.
  userId | ID of the remote user.
  elapsed | The time elapsed (ms) from the loca user calling `joinChannel` until this callback is triggered.

## ◆ onFirstRemoteAudioDecoded() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onFirstRemoteAudioDecoded | ( | const RtcConnection & | connection,
|  | uid_t | uid,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the SDK decodes the first remote audio frame for playback.

Deprecated:
  Use `onRemoteAudioStateChanged` instead. The SDK triggers this callback under one of the following circumstances:
  - The remote user joins the channel and sends the audio stream for the first time.
  - The remote user's audio is offline and then goes online to re-send audio. It means the local user cannot receive audio in 15 seconds. Reasons for such an interruption include:
    - The remote user leaves channel.
    - The remote user drops offline.
    - The remote user calls muteLocalAudioStream to stop sending the audio stream.
    - The remote user calls disableAudio to disable audio.

Parameters

  connection | The RtcConnection object.
  uid | User ID of the remote user sending the audio stream.
  elapsed | The time elapsed (ms) from the loca user calling `joinChannel` until this callback is triggered.

## ◆ onLocalAudioStateChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onLocalAudioStateChanged | ( | const RtcConnection & | connection,
|  | LOCAL_AUDIO_STREAM_STATE | state,
|  | LOCAL_AUDIO_STREAM_REASON | reason
| ) |  |
| virtual

Occurs when the local audio state changes.

When the state of the local audio stream changes (including the state of the audio capture and encoding), the SDK triggers this callback to report the current state. This callback indicates the state of the local audio stream, and allows you to troubleshoot issues when audio exceptions occur.

Note
  When the state is `LOCAL_AUDIO_STREAM_STATE_FAILED(3)`, see the `error` parameter for details.

Parameters

  connection | The RtcConnection object.
  state | State of the local audio. See #LOCAL_AUDIO_STREAM_STATE.
  reason | The reason information of the local audio. See #LOCAL_AUDIO_STREAM_REASON.

## ◆ onRemoteAudioStateChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRemoteAudioStateChanged | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | REMOTE_AUDIO_STATE | state,
|  | REMOTE_AUDIO_STATE_REASON | reason,
|  | int | elapsed
| ) |  |
| virtual

Occurs when the remote audio state changes.

When the audio state of a remote user (in the voice/video call channel) or host (in the live streaming channel) changes, the SDK triggers this callback to report the current state of the remote audio stream.

Note
  This callback does not work properly when the number of users (in the voice/video call channel) or hosts (in the live streaming channel) in the channel exceeds 17.

Parameters

  connection | The RtcConnection object.
  remoteUid | ID of the remote user whose audio state changes.
  state | State of the remote audio. See #REMOTE_AUDIO_STATE.
  reason | The reason of the remote audio state change. See #REMOTE_AUDIO_STATE_REASON.
  elapsed | Time elapsed (ms) from the local user calling the `joinChannel` method until the SDK triggers this callback.

## ◆ onActiveSpeaker() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onActiveSpeaker | ( | const RtcConnection & | connection,
|  | uid_t | uid
| ) |  |
| virtual

Occurs when an active speaker is detected.

After a successful call of `enableAudioVolumeIndication`, the SDK continuously detects which remote user has the loudest volume. During the current period, the remote user, who is detected as the loudest for the most times, is the most active user.

When the number of users is no less than two and an active remote speaker exists, the SDK triggers this callback and reports the uid of the most active remote speaker.

- If the most active remote speaker is always the same user, the SDK triggers the `onActiveSpeaker` callback only once.
- If the most active remote speaker changes to another user, the SDK triggers this callback again and reports the uid of the new active remote speaker.

Parameters

  connection | The RtcConnection object.
  uid | The ID of the active speaker. A `uid` of 0 means the local user.

## ◆ onClientRoleChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onClientRoleChanged | ( | const RtcConnection & | connection,
|  | CLIENT_ROLE_TYPE | oldRole,
|  | CLIENT_ROLE_TYPE | newRole,
|  | const ClientRoleOptions & | newRoleOptions
| ) |  |
| virtual

Occurs when the user role switches in the interactive live streaming.

Parameters

  connection | The RtcConnection of the local user: #RtcConnection
  oldRole | The old role of the user: #CLIENT_ROLE_TYPE
  newRole | The new role of the user: #CLIENT_ROLE_TYPE
  newRoleOptions | The client role options of the new role: #ClientRoleOptions.

## ◆ onClientRoleChangeFailed() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onClientRoleChangeFailed | ( | const RtcConnection & | connection,
|  | CLIENT_ROLE_CHANGE_FAILED_REASON | reason,
|  | CLIENT_ROLE_TYPE | currentRole
| ) |  |
| virtual

Occurs when the user role in a Live-Broadcast channel fails to switch, for example, from a broadcaster to an audience or vice versa.

Parameters

  connection | The RtcConnection object.
  reason | The reason for failing to change the client role: #CLIENT_ROLE_CHANGE_FAILED_REASON.
  currentRole | The current role of the user: #CLIENT_ROLE_TYPE.

## ◆ onRemoteAudioTransportStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRemoteAudioTransportStats | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | unsigned short | delay,
|  | unsigned short | lost,
|  | unsigned short | rxKBitRate
| ) |  |
| virtual

Reports the transport-layer statistics of each remote audio stream.

Deprecated:
  Use `onRemoteAudioStats` instead.

This callback reports the transport-layer statistics, such as the packet loss rate and network time delay, once every two seconds after the local user receives an audio packet from a remote user. During a call, when the user receives the audio packet sent by the remote user/host, the callback is triggered every 2 seconds.

Parameters

  connection | The RtcConnection object.
  remoteUid | ID of the remote user whose audio data packet is received.
  delay | The network time delay (ms) from the sender to the receiver.
  lost | The Packet loss rate (%) of the audio packet sent from the remote user.
  rxKBitRate | Received bitrate (Kbps) of the audio packet sent from the remote user.

## ◆ onRemoteVideoTransportStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onRemoteVideoTransportStats | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | unsigned short | delay,
|  | unsigned short | lost,
|  | unsigned short | rxKBitRate
| ) |  |
| virtual

Reports the transport-layer statistics of each remote video stream.

Deprecated:
  Use `onRemoteVideoStats` instead.

This callback reports the transport-layer statistics, such as the packet loss rate and network time delay, once every two seconds after the local user receives a video packet from a remote user.

During a call, when the user receives the video packet sent by the remote user/host, the callback is triggered every 2 seconds.

Parameters

  connection | The RtcConnection object.
  remoteUid | ID of the remote user whose video packet is received.
  delay | The network time delay (ms) from the remote user sending the video packet to the local user.
  lost | The packet loss rate (%) of the video packet sent from the remote user.
  rxKBitRate | The bitrate (Kbps) of the video packet sent from the remote user.

## ◆ onConnectionStateChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onConnectionStateChanged | ( | const RtcConnection & | connection,
|  | CONNECTION_STATE_TYPE | state,
|  | CONNECTION_CHANGED_REASON_TYPE | reason
| ) |  |
| virtual

Occurs when the network connection state changes.

When the network connection state changes, the SDK triggers this callback and reports the current connection state and the reason for the change.

Parameters

  connection | The RtcConnection object.
  state | The current connection state. See #CONNECTION_STATE_TYPE.
  reason | The reason for a connection state change. See #CONNECTION_CHANGED_REASON_TYPE.

## ◆ onWlAccMessage() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onWlAccMessage | ( | const RtcConnection & | connection,
|  | WLACC_MESSAGE_REASON | reason,
|  | WLACC_SUGGEST_ACTION | action,
|  | const char * | wlAccMsg
| ) |  |
| virtual

Occurs when the WIFI message need be sent to the user.

Parameters

  connection | The RtcConnection object.
  reason | The reason of notifying the user of a message.
  action | Suggest an action for the user.
  wlAccMsg | The message content of notifying the user.

## ◆ onWlAccStats() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onWlAccStats | ( | const RtcConnection & | connection,
|  | WlAccStats | currentStats,
|  | WlAccStats | averageStats
| ) |  |
| virtual

Occurs when SDK statistics wifi acceleration optimization effect.

Parameters

  connection | The RtcConnection object.
  currentStats | Instantaneous value of optimization effect.
  averageStats | Average value of cumulative optimization effect.

## ◆ onNetworkTypeChanged() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onNetworkTypeChanged | ( | const RtcConnection & | connection,
|  | NETWORK_TYPE | type
| ) |  |
| virtual

Occurs when the local network type changes.

This callback occurs when the connection state of the local user changes. You can get the connection state and reason for the state change in this callback. When the network connection is interrupted, this callback indicates whether the interruption is caused by a network type change or poor network conditions.

Parameters

  connection | The RtcConnection object.
  type | The type of the local network connection. See #NETWORK_TYPE.

## ◆ onEncryptionError() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onEncryptionError | ( | const RtcConnection & | connection,
|  | ENCRYPTION_ERROR_TYPE | errorType
| ) |  |
| virtual

Reports the built-in encryption errors.

When encryption is enabled by calling `enableEncryption`, the SDK triggers this callback if an error occurs in encryption or decryption on the sender or the receiver side.

Parameters

  connection | The RtcConnection object.
  errorType | The error type. See #ENCRYPTION_ERROR_TYPE.

## ◆ onUploadLogResult() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUploadLogResult | ( | const RtcConnection & | connection,
|  | const char * | requestId,
|  | bool | success,
|  | UPLOAD_ERROR_REASON | reason
| ) |  |
| virtual

Reports the user log upload result

Parameters

  connection | The RtcConnection object.
  requestId | RequestId of the upload
  success | Is upload success
  reason | Reason of the upload, 0: OK, 1 Network Error, 2 Server Error.

## ◆ onUserAccountUpdated() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onUserAccountUpdated | ( | const RtcConnection & | connection,
|  | uid_t | remoteUid,
|  | const char * | remoteUserAccount
| ) |  |
| virtual

Occurs when the user account is updated.

Parameters

  connection | The RtcConnection object.
  remoteUid | The user ID.
  userAccount | The user account.

## ◆ onSnapshotTaken() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onSnapshotTaken | ( | const RtcConnection & | connection,
|  | uid_t | uid,
|  | const char * | filePath,
|  | int | width,
|  | int | height,
|  | int | errCode
| ) |  |
| virtual

Reports the result of taking a video snapshot.

After a successful `takeSnapshot` method call, the SDK triggers this callback to report whether the snapshot is successfully taken, as well as the details for that snapshot.

Parameters

  connection | The RtcConnection object.
  uid | The user ID. A `uid` of 0 indicates the local user.
  filePath | The local path of the snapshot.
  width | The width (px) of the snapshot.
  height | The height (px) of the snapshot.
  errCode | The message that confirms success or gives the reason why the snapshot is not successfully taken: 0: Success. < 0: Failure. -1: The SDK fails to write data to a file or encode a JPEG image. -2: The SDK does not find the video stream of the specified user within one second after the `takeSnapshot` method call succeeds. -3: Calling the `takeSnapshot` method too frequently. Call the `takeSnapshot` method after receiving the `onSnapshotTaken` callback from the previous call.

## ◆ onVideoRenderingTracingResult() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onVideoRenderingTracingResult | ( | const RtcConnection & | connection,
|  | uid_t | uid,
|  | MEDIA_TRACE_EVENT | currentEvent,
|  | VideoRenderingTracingInfo | tracingInfo
| ) |  |
| virtual

Reports the tracing result of video rendering event of the user.

Parameters

  connection | The RtcConnection object.
  uid | The user ID.
  currentEvent | The current event of the tracing result: #MEDIA_TRACE_EVENT.
  tracingInfo | The tracing result: #VideoRenderingTracingInfo.

## ◆ onSetRtmFlagResult() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onSetRtmFlagResult | ( | const RtcConnection & | connection,
|  | int | code
| ) |  |
| virtual

Occurs when receive use rtm response.

Parameters

  connection | The RtcConnection object.
  code | The error code:

## ◆ onTranscodedStreamLayoutInfo() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onTranscodedStreamLayoutInfo | ( | const RtcConnection & | connection,
|  | uid_t | uid,
|  | int | width,
|  | int | height,
|  | int | layoutCount,
|  | const VideoLayout * | layoutlist
| ) |  |
| virtual

Occurs when receive a video transcoder stream which has video layout info.

Parameters

  connection | The RtcConnection object.
  uid | user id of the transcoded stream.
  width | width of the transcoded stream.
  height | height of the transcoded stream.
  layoutCount | count of layout info in the transcoded stream.
  layoutlist | video layout info list of the transcoded stream.

## ◆ onAudioMetadataReceived() [1/2]

virtual void agora::rtc::IRtcEngineEventHandlerEx::onAudioMetadataReceived | ( | const RtcConnection & | connection,
|  | uid_t | uid,
|  | const char * | metadata,
|  | size_t | length
| ) |  |
| virtual

The audio metadata received.

Parameters

  connection | The RtcConnection object.
  uid | ID of the remote user.
  metadata | The pointer of metadata
  length | Size of metadata @technical preview

## ◆ onJoinChannelSuccess() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onJoinChannelSuccess

Occurs when a user joins a channel.

This callback notifies the application that a user joins a specified channel.

Parameters

  channel | The channel name.
  uid | The ID of the user who joins the channel.
  elapsed | The time elapsed (ms) from the local user calling joinChannel until the SDK triggers this callback.

## ◆ onRejoinChannelSuccess() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRejoinChannelSuccess

Occurs when a user rejoins the channel.

When a user loses connection with the server because of network problems, the SDK automatically tries to reconnect and triggers this callback upon reconnection.

Parameters

  channel | The channel name.
  uid | The ID of the user who rejoins the channel.
  elapsed | Time elapsed (ms) from the local user calling the joinChannel method until this callback is triggered.

## ◆ onAudioQuality() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onAudioQuality

Reports the statistics of the audio stream from each remote user/broadcaster.

Deprecated:
  This callback is deprecated. Use onRemoteAudioStats instead.

The SDK triggers this callback once every two seconds to report the audio quality of each remote user/host sending an audio stream. If a channel has multiple remote users/hosts sending audio streams, the SDK triggers this callback as many times.

Parameters

  uid | The user ID of the remote user sending the audio stream.
  quality | The audio quality of the user: #QUALITY_TYPE
  delay | The network delay (ms) from the sender to the receiver, including the delay caused by audio sampling pre-processing, network transmission, and network jitter buffering.
  lost | The audio packet loss rate (%) from the sender to the receiver.

## ◆ onAudioVolumeIndication() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onAudioVolumeIndication

Reports the volume information of users.

By default, this callback is disabled. You can enable it by calling `enableAudioVolumeIndication`. Once this callback is enabled and users send streams in the channel, the SDK triggers the `onAudioVolumeIndication` callback at the time interval set in `enableAudioVolumeIndication`. The SDK triggers two independent `onAudioVolumeIndication` callbacks simultaneously, which separately report the volume information of the local user who sends a stream and the remote users (up to three) whose instantaneous volume is the highest.

Note
  After you enable this callback, calling muteLocalAudioStream affects the SDK's behavior as follows:
  - If the local user stops publishing the audio stream, the SDK stops triggering the local user's callback.
  - 20 seconds after a remote user whose volume is one of the three highest stops publishing the audio stream, the callback excludes this user's information; 20 seconds after all remote users stop publishing audio streams, the SDK stops triggering the callback for remote users.

Parameters

  speakers | The volume information of the users, see AudioVolumeInfo. An empty `speakers` array in the callback indicates that no remote user is in the channel or sending a stream at the moment.
  speakerNumber | The total number of speakers. In the local user's callback, when the local user sends a stream, `speakerNumber` is 1. In the callback for remote users, the value range of speakerNumber is [0,3]. If the number of remote users who send streams is greater than or equal to three, the value of `speakerNumber` is 3.
  totalVolume | The volume of the speaker. The value ranges between 0 (lowest volume) and 255 (highest volume). In the local user's callback, `totalVolume` is the volume of the local user who sends a stream. In the remote users' callback, `totalVolume` is the sum of all remote users (up to three) whose instantaneous volume is the highest. If the user calls `startAudioMixing`, `totalVolume` is the volume after audio mixing.

## ◆ onLeaveChannel() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onLeaveChannel

Occurs when a user leaves a channel.

This callback notifies the app that the user leaves the channel by calling `leaveChannel`. From this callback, the app can get information such as the call duration and quality statistics.

Parameters

  stats | The statistics on the call: RtcStats.

## ◆ onRtcStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRtcStats

Reports the statistics of the current call.

The SDK triggers this callback once every two seconds after the user joins the channel.

Parameters

  stats | The statistics of the current call: RtcStats.

## ◆ onNetworkQuality() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onNetworkQuality

Reports the last mile network quality of each user in the channel.

This callback reports the last mile network conditions of each user in the channel. Last mile refers to the connection between the local device and Agora's edge server.

The SDK triggers this callback once every two seconds. If a channel includes multiple users, the SDK triggers this callback as many times.

Note
  `txQuality` is UNKNOWN when the user is not sending a stream; `rxQuality` is UNKNOWN when the user is not receiving a stream.

Parameters

  uid | The user ID. The network quality of the user with this user ID is reported.
  txQuality | Uplink network quality rating of the user in terms of the transmission bit rate, packet loss rate, average RTT (Round-Trip Time) and jitter of the uplink network. This parameter is a quality rating helping you understand how well the current uplink network conditions can support the selected video encoder configuration. For example, a 1000 Kbps uplink network may be adequate for video frames with a resolution of 640 × 480 and a frame rate of 15 fps in the LIVE_BROADCASTING profile, but may be inadequate for resolutions higher than 1280 × 720. See #QUALITY_TYPE.
  rxQuality | Downlink network quality rating of the user in terms of packet loss rate, average RTT, and jitter of the downlink network. See #QUALITY_TYPE.

## ◆ onIntraRequestReceived() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onIntraRequestReceived

Occurs when intra request from remote user is received.

This callback is triggered once remote user needs one Key frame.

## ◆ onFirstLocalVideoFramePublished() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onFirstLocalVideoFramePublished

Occurs when the first local video frame is published. The SDK triggers this callback under one of the following circumstances:

- The local client enables the video module and calls `joinChannel` successfully.
- The local client calls `muteLocalVideoStream(true)` and muteLocalVideoStream(false) in sequence.
- The local client calls `disableVideo` and `enableVideo` in sequence.
- The local client calls `pushVideoFrame` to successfully push the video frame to the SDK.
  Parameters

    source | The video source type.
    elapsed | The time elapsed (ms) from the local user calling joinChannel` to the SDK triggers this callback.

## ◆ onFirstRemoteVideoDecoded() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onFirstRemoteVideoDecoded

Occurs when the first remote video frame is received and decoded.

The SDK triggers this callback under one of the following circumstances:

- The remote user joins the channel and sends the video stream.
- The remote user stops sending the video stream and re-sends it after 15 seconds. Reasons for such an interruption include:
  - The remote user leaves the channel.
  - The remote user drops offline.
  - The remote user calls `muteLocalVideoStream` to stop sending the video stream.
  - The remote user calls `disableVideo` to disable video.

Parameters

  uid | The user ID of the remote user sending the video stream.
  width | The width (pixels) of the video stream.
  height | The height (pixels) of the video stream.
  elapsed | The time elapsed (ms) from the local user calling `joinChannel` until the SDK triggers this callback.

## ◆ onVideoSizeChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onVideoSizeChanged

Occurs when the local or remote video size or rotation has changed.

Parameters

  sourceType | The video source type: #VIDEO_SOURCE_TYPE.
  uid | The user ID. 0 indicates the local user.
  width | The new width (pixels) of the video.
  height | The new height (pixels) of the video.
  rotation | The rotation information of the video.

## ◆ onLocalVideoStateChanged()

virtual void agora::rtc::IRtcEngineEventHandler::onLocalVideoStateChanged

Occurs when the local video stream state changes.

When the state of the local video stream changes (including the state of the video capture and encoding), the SDK triggers this callback to report the current state. This callback indicates the state of the local video stream, including camera capturing and video encoding, and allows you to troubleshoot issues when exceptions occur.

The SDK triggers the onLocalVideoStateChanged callback with the state code of `LOCAL_VIDEO_STREAM_STATE_FAILED` and error code of `LOCAL_VIDEO_STREAM_REASON_CAPTURE_FAILURE` in the following situations:

- The app switches to the background, and the system gets the camera resource.
- The camera starts normally, but does not output video for four consecutive seconds.

When the camera outputs the captured video frames, if the video frames are the same for 15 consecutive frames, the SDK triggers the `onLocalVideoStateChanged` callback with the state code of `LOCAL_VIDEO_STREAM_STATE_CAPTURING` and error code of `LOCAL_VIDEO_STREAM_REASON_CAPTURE_FAILURE`. Note that the video frame duplication detection is only available for video frames with a resolution greater than 200 × 200, a frame rate greater than or equal to 10 fps, and a bitrate less than 20 Kbps.

Note
  For some device models, the SDK does not trigger this callback when the state of the local video changes while the local video capturing device is in use, so you have to make your own timeout judgment.

Parameters

  source | The video source type: #VIDEO_SOURCE_TYPE.
  state | The state of the local video. See #LOCAL_VIDEO_STREAM_STATE.
  reason | The detailed error information. See #LOCAL_VIDEO_STREAM_REASON.

## ◆ onRemoteVideoStateChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRemoteVideoStateChanged

Occurs when the remote video state changes.

Note
  This callback does not work properly when the number of users (in the voice/video call channel) or hosts (in the live streaming channel) in the channel exceeds 17.

Parameters

  uid | The ID of the user whose video state has changed.
  state | The remote video state: #REMOTE_VIDEO_STATE.
  reason | The reason of the remote video state change: #REMOTE_VIDEO_STATE_REASON.
  elapsed | The time elapsed (ms) from the local client calling `joinChannel` until this callback is triggered.

## ◆ onFirstRemoteVideoFrame() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onFirstRemoteVideoFrame

Occurs when the renderer receives the first frame of the remote video.

Parameters

  uid | The user ID of the remote user sending the video stream.
  width | The width (px) of the video frame.
  height | The height (px) of the video stream.
  elapsed | The time elapsed (ms) from the local user calling `joinChannel` until the SDK triggers this callback.

## ◆ onUserJoined() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserJoined

Occurs when a remote user or broadcaster joins the channel.

- In the COMMUNICATION channel profile, this callback indicates that a remote user joins the channel. The SDK also triggers this callback to report the existing users in the channel when a user joins the channel. In the LIVE_BROADCASTING channel profile, this callback indicates that a host joins the channel. The SDK also triggers this callback to report the existing hosts in the channel when a host joins the channel. Agora recommends limiting the number of hosts to 17.

The SDK triggers this callback under one of the following circumstances:

- A remote user/host joins the channel by calling the `joinChannel` method.
- A remote user switches the user role to the host after joining the channel.
- A remote user/host rejoins the channel after a network interruption.

Parameters

  uid | The ID of the remote user or broadcaster joining the channel.
  elapsed | The time elapsed (ms) from the local user calling `joinChannel` or `setClientRole` until this callback is triggered.

## ◆ onUserOffline() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserOffline

Occurs when a remote user or broadcaster goes offline.

There are two reasons for a user to go offline:

- Leave the channel: When the user leaves the channel, the user sends a goodbye message. When this message is received, the SDK determines that the user leaves the channel.
- Drop offline: When no data packet of the user is received for a certain period of time, the SDK assumes that the user drops offline. A poor network connection may lead to false detection, so we recommend using the RTM SDK for reliable offline detection.
- The user switches the user role from a broadcaster to an audience.

Parameters

  uid | The ID of the remote user or broadcaster who leaves the channel or drops offline.
  reason | The reason why the remote user goes offline: #USER_OFFLINE_REASON_TYPE.

## ◆ onUserMuteAudio() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserMuteAudio

Occurs when a remote user's audio stream playback pauses/resumes.

The SDK triggers this callback when the remote user stops or resumes sending the audio stream by calling the `muteLocalAudioStream` method.

Note
  This callback can be inaccurate when the number of users (in the `COMMUNICATION` profile) or hosts (in the `LIVE_BROADCASTING` profile) in the channel exceeds 17.

Parameters

  uid | The user ID.
  muted | Whether the remote user's audio stream is muted/unmuted: true: Muted. false: Unmuted.

## ◆ onUserMuteVideo() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserMuteVideo

Occurs when a remote user pauses or resumes sending the video stream.

When a remote user calls `muteLocalVideoStream` to stop or resume publishing the video stream, the SDK triggers this callback to report the state of the remote user's publishing stream to the local user.

Note
  This callback is invalid when the number of users or broadacasters in a channel exceeds 20.

Parameters

  userId | ID of the remote user.
  muted | Whether the remote user stops publishing the video stream: true: The remote user has paused sending the video stream. false: The remote user has resumed sending the video stream.

## ◆ onUserEnableVideo() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserEnableVideo

Occurs when a remote user enables or disables the video module.

Once the video function is disabled, the users cannot see any video.

The SDK triggers this callback when a remote user enables or disables the video module by calling the `enableVideo` or `disableVideo` method.

Parameters

  uid | The ID of the remote user.
  enabled | Whether the video of the remote user is enabled: true: The remote user has enabled video. false: The remote user has disabled video.

## ◆ onUserEnableLocalVideo() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserEnableLocalVideo

Occurs when a remote user enables or disables local video capturing.

The SDK triggers this callback when the remote user resumes or stops capturing the video stream by calling the `enableLocalVideo` method.

Parameters

  uid | The ID of the remote user.
  enabled | Whether the specified remote user enables/disables local video: `true`: The remote user has enabled local video capturing. `false`: The remote user has disabled local video capturing.

## ◆ onUserStateChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserStateChanged

Occurs when the remote user audio or video state is updated.

Parameters

  uid | The uid of the remote user.
  state | The remote user's audio or video state: #REMOTE_USER_STATE.

## ◆ onLocalAudioStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onLocalAudioStats

Reports the statistics of the local audio stream.

The SDK triggers this callback once every two seconds.

Parameters

  stats | The statistics of the local audio stream. See LocalAudioStats.

## ◆ onRemoteAudioStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRemoteAudioStats

Reports the statistics of the audio stream from each remote user/host.

The SDK triggers this callback once every two seconds for each remote user who is sending audio streams. If a channel includes multiple remote users, the SDK triggers this callback as many times.

Parameters

  stats | Statistics of the received remote audio streams. See RemoteAudioStats.

## ◆ onLocalVideoStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onLocalVideoStats

Reports the statistics of the local video stream.

The SDK triggers this callback once every two seconds for each user/host. If there are multiple users/hosts in the channel, the SDK triggers this callback as many times.

Note
  If you have called the `enableDualStreamMode` method, this callback reports the statistics of the high-video stream (high bitrate, and high-resolution video stream).

Parameters

  source | The video source type. See #VIDEO_SOURCE_TYPE.
  stats | Statistics of the local video stream. See LocalVideoStats.

## ◆ onRemoteVideoStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRemoteVideoStats

Reports the statistics of the video stream from each remote user/host.

The SDK triggers this callback once every two seconds for each remote user. If a channel has multiple users/hosts sending video streams, the SDK triggers this callback as many times.

Parameters

  stats | Statistics of the remote video stream. See RemoteVideoStats.

## ◆ onConnectionLost() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onConnectionLost

Occurs when the SDK cannot reconnect to the server 10 seconds after its connection to the server is interrupted.

The SDK triggers this callback when it cannot connect to the server 10 seconds after calling `joinChannel`, regardless of whether it is in the channel or not. If the SDK fails to rejoin the channel 20 minutes after being disconnected from Agora's edge server, the SDK stops rejoining the channel.

## ◆ onConnectionInterrupted() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onConnectionInterrupted

Occurs when the connection between the SDK and the server is interrupted.

Deprecated:
  Use `onConnectionStateChanged` instead.

The SDK triggers this callback when it loses connection with the serer for more than 4 seconds after the connection is established. After triggering this callback, the SDK tries to reconnect to the server. If the reconnection fails within a certain period (10 seconds by default), the onConnectionLost() callback is triggered. If the SDK fails to rejoin the channel 20 minutes after being disconnected from Agora's edge server, the SDK stops rejoining the channel.

## ◆ onConnectionBanned() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onConnectionBanned

Occurs when your connection is banned by the Agora Server.

Deprecated:
  Use `onConnectionStateChanged` instead.

## ◆ onStreamMessage() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onStreamMessage

Occurs when the local user receives the data stream from the remote user.

The SDK triggers this callback when the user receives the data stream that another user sends by calling the sendStreamMessage method.

Parameters

  uid | ID of the user who sends the data stream.
  streamId | The ID of the stream data.
  data | The data stream.
  length | The length (byte) of the data stream.
  sentTs | The time when the data stream sent.

## ◆ onStreamMessageError() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onStreamMessageError

Occurs when the local user does not receive the data stream from the remote user.

The SDK triggers this callback when the user fails to receive the data stream that another user sends by calling the sendStreamMessage method.

Parameters

  uid | ID of the user who sends the data stream.
  streamId | The ID of the stream data.
  code | The error code.
  missed | The number of lost messages.
  cached | The number of incoming cached messages when the data stream is interrupted.

## ◆ onRequestToken() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRequestToken

Occurs when the token expires.

When the token expires during a call, the SDK triggers this callback to remind the app to renew the token.

Upon receiving this callback, generate a new token at your app server and call `joinChannel` to pass the new token to the SDK.

## ◆ onTokenPrivilegeWillExpire() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onTokenPrivilegeWillExpire

Occurs when the token will expire in 30 seconds.

When the token is about to expire in 30 seconds, the SDK triggers this callback to remind the app to renew the token.

Upon receiving this callback, generate a new token at your app server and call renewToken to pass the new Token to the SDK.

Parameters

  token | The token that will expire in 30 seconds.

## ◆ onLicenseValidationFailure() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onLicenseValidationFailure

Occurs when connection license verification fails.

You can know the reason accordding to error code

## ◆ onFirstLocalAudioFramePublished() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onFirstLocalAudioFramePublished

Occurs when the first local audio frame is published.

The SDK triggers this callback under one of the following circumstances:

- The local client enables the audio module and calls `joinChannel` successfully.
- The local client calls `muteLocalAudioStream(true)` and `muteLocalAudioStream(false)` in sequence.
- The local client calls `disableAudio` and `enableAudio` in sequence.
- The local client calls `pushAudioFrame` to successfully push the audio frame to the SDK.

Parameters

  elapsed | The time elapsed (ms) from the local user calling `joinChannel` to the SDK triggers this callback.

## ◆ onFirstRemoteAudioFrame() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onFirstRemoteAudioFrame

Occurs when the SDK receives the first audio frame from a specific remote user.

Deprecated:
  Use `onRemoteAudioStateChanged` instead.

Parameters

  uid | ID of the remote user.
  elapsed | The time elapsed (ms) from the loca user calling `joinChannel` until this callback is triggered.

## ◆ onFirstRemoteAudioDecoded() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onFirstRemoteAudioDecoded

Occurs when the SDK decodes the first remote audio frame for playback.

Deprecated:
  Use `onRemoteAudioStateChanged` instead. The SDK triggers this callback under one of the following circumstances:
  - The remote user joins the channel and sends the audio stream for the first time.
  - The remote user's audio is offline and then goes online to re-send audio. It means the local user cannot receive audio in 15 seconds. Reasons for such an interruption include:
    - The remote user leaves channel.
    - The remote user drops offline.
    - The remote user calls muteLocalAudioStream to stop sending the audio stream.
    - The remote user calls disableAudio to disable audio.

Parameters

  uid | User ID of the remote user sending the audio stream.
  elapsed | The time elapsed (ms) from the loca user calling `joinChannel` until this callback is triggered.

## ◆ onLocalAudioStateChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onLocalAudioStateChanged

Occurs when the local audio state changes.

When the state of the local audio stream changes (including the state of the audio capture and encoding), the SDK triggers this callback to report the current state. This callback indicates the state of the local audio stream, and allows you to troubleshoot issues when audio exceptions occur.

Note
  When the state is `LOCAL_AUDIO_STREAM_STATE_FAILED(3)`, see the `error` parameter for details.

Parameters

  state | State of the local audio. See #LOCAL_AUDIO_STREAM_STATE.
  reason | The reason information of the local audio. See #LOCAL_AUDIO_STREAM_REASON.

## ◆ onRemoteAudioStateChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRemoteAudioStateChanged

Occurs when the remote audio state changes.

When the audio state of a remote user (in the voice/video call channel) or host (in the live streaming channel) changes, the SDK triggers this callback to report the current state of the remote audio stream.

Note
  This callback does not work properly when the number of users (in the voice/video call channel) or hosts (in the live streaming channel) in the channel exceeds 17.

Parameters

  uid | ID of the remote user whose audio state changes.
  state | State of the remote audio. See #REMOTE_AUDIO_STATE.
  reason | The reason of the remote audio state change. See #REMOTE_AUDIO_STATE_REASON.
  elapsed | Time elapsed (ms) from the local user calling the `joinChannel` method until the SDK triggers this callback.

## ◆ onActiveSpeaker() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onActiveSpeaker

Occurs when an active speaker is detected.

After a successful call of `enableAudioVolumeIndication`, the SDK continuously detects which remote user has the loudest volume. During the current period, the remote user, who is detected as the loudest for the most times, is the most active user.

When the number of users is no less than two and an active remote speaker exists, the SDK triggers this callback and reports the uid of the most active remote speaker.

- If the most active remote speaker is always the same user, the SDK triggers the `onActiveSpeaker` callback only once.
- If the most active remote speaker changes to another user, the SDK triggers this callback again and reports the uid of the new active remote speaker.

Parameters

  userId | The ID of the active speaker. A `uid` of 0 means the local user.

## ◆ onClientRoleChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onClientRoleChanged

Occurs when the user role switches in the interactive live streaming.

Parameters

  oldRole | The old role of the user: #CLIENT_ROLE_TYPE.
  newRole | The new role of the user: #CLIENT_ROLE_TYPE.
  newRoleOptions | The client role options of the new role: #ClientRoleOptions.

## ◆ onClientRoleChangeFailed() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onClientRoleChangeFailed

Occurs when the user role in a Live-Broadcast channel fails to switch, for example, from a broadcaster to an audience or vice versa.

Parameters

  reason | The reason for failing to change the client role: #CLIENT_ROLE_CHANGE_FAILED_REASON.
  currentRole | The current role of the user: #CLIENT_ROLE_TYPE.

## ◆ onRemoteAudioTransportStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRemoteAudioTransportStats

Reports the transport-layer statistics of each remote audio stream.

Deprecated:
  Use `onRemoteAudioStats` instead.

This callback reports the transport-layer statistics, such as the packet loss rate and network time delay, once every two seconds after the local user receives an audio packet from a remote user. During a call, when the user receives the audio packet sent by the remote user/host, the callback is triggered every 2 seconds.

Parameters

  uid | ID of the remote user whose audio data packet is received.
  delay | The network time delay (ms) from the sender to the receiver.
  lost | The Packet loss rate (%) of the audio packet sent from the remote user.
  rxKBitRate | Received bitrate (Kbps) of the audio packet sent from the remote user.

## ◆ onRemoteVideoTransportStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onRemoteVideoTransportStats

Reports the transport-layer statistics of each remote video stream.

Deprecated:
  Use `onRemoteVideoStats` instead.

This callback reports the transport-layer statistics, such as the packet loss rate and network time delay, once every two seconds after the local user receives a video packet from a remote user.

During a call, when the user receives the video packet sent by the remote user/host, the callback is triggered every 2 seconds.

Parameters

  uid | ID of the remote user whose video packet is received.
  delay | The network time delay (ms) from the remote user sending the video packet to the local user.
  lost | The packet loss rate (%) of the video packet sent from the remote user.
  rxKBitRate | The bitrate (Kbps) of the video packet sent from the remote user.

## ◆ onConnectionStateChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onConnectionStateChanged

Occurs when the network connection state changes.

When the network connection state changes, the SDK triggers this callback and reports the current connection state and the reason for the change.

Parameters

  state | The current connection state. See #CONNECTION_STATE_TYPE.
  reason | The reason for a connection state change. See #CONNECTION_CHANGED_REASON_TYPE.

## ◆ onWlAccMessage() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onWlAccMessage

Occurs when the WIFI message need be sent to the user.

Parameters

  reason | The reason of notifying the user of a message.
  action | Suggest an action for the user.
  wlAccMsg | The message content of notifying the user.

## ◆ onWlAccStats() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onWlAccStats

Occurs when SDK statistics wifi acceleration optimization effect.

Parameters

  currentStats | Instantaneous value of optimization effect.
  averageStats | Average value of cumulative optimization effect.

## ◆ onNetworkTypeChanged() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onNetworkTypeChanged

Occurs when the local network type changes.

This callback occurs when the connection state of the local user changes. You can get the connection state and reason for the state change in this callback. When the network connection is interrupted, this callback indicates whether the interruption is caused by a network type change or poor network conditions.

Parameters

  type | The type of the local network connection. See #NETWORK_TYPE.

## ◆ onEncryptionError() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onEncryptionError

Reports the built-in encryption errors.

When encryption is enabled by calling `enableEncryption`, the SDK triggers this callback if an error occurs in encryption or decryption on the sender or the receiver side.

Parameters

  errorType | The error type. See #ENCRYPTION_ERROR_TYPE.

## ◆ onUploadLogResult() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUploadLogResult

Reports the user log upload result

Parameters

  requestId | RequestId of the upload
  success | Is upload success
  reason | Reason of the upload, 0: OK, 1 Network Error, 2 Server Error.

## ◆ onUserInfoUpdated()

virtual void agora::rtc::IRtcEngineEventHandler::onUserInfoUpdated

Occurs when the SDK gets the user ID and user account of the remote user.

After a remote user joins the channel, the SDK gets the UID and user account of the remote user, caches them in a mapping table object (`userInfo`), and triggers this callback on the local client.

Parameters

  uid | The ID of the remote user.
  info | The `UserInfo` object that contains the user ID and user account of the remote user.

## ◆ onUserAccountUpdated() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onUserAccountUpdated

Occurs when the user account is updated.

Parameters

  uid | The user ID.
  userAccount | The user account.

## ◆ onAudioSubscribeStateChanged()

virtual void agora::rtc::IRtcEngineEventHandler::onAudioSubscribeStateChanged

Occurs when the audio subscribing state changes.

Parameters

  channel | The name of the channel.
  uid | The ID of the remote user.
  oldState | The previous subscribing status: #STREAM_SUBSCRIBE_STATE.
  newState | The current subscribing status: #STREAM_SUBSCRIBE_STATE.
  elapseSinceLastState | The time elapsed (ms) from the previous state to the current state.

## ◆ onVideoSubscribeStateChanged()

virtual void agora::rtc::IRtcEngineEventHandler::onVideoSubscribeStateChanged

Occurs when the video subscribing state changes.

Parameters

  channel | The name of the channel.
  uid | The ID of the remote user.
  oldState | The previous subscribing status: #STREAM_SUBSCRIBE_STATE.
  newState | The current subscribing status: #STREAM_SUBSCRIBE_STATE.
  elapseSinceLastState | The time elapsed (ms) from the previous state to the current state.

## ◆ onAudioPublishStateChanged()

virtual void agora::rtc::IRtcEngineEventHandler::onAudioPublishStateChanged

Occurs when the audio publishing state changes.

Parameters

  channel | The name of the channel.
  oldState | The previous publishing state: #STREAM_PUBLISH_STATE.
  newState | The current publishing state: #STREAM_PUBLISH_STATE.
  elapseSinceLastState | The time elapsed (ms) from the previous state to the current state.

## ◆ onVideoPublishStateChanged()

virtual void agora::rtc::IRtcEngineEventHandler::onVideoPublishStateChanged

Occurs when the video publishing state changes.

Parameters

  source | The video source type.
  channel | The name of the channel.
  oldState | The previous publishing state: #STREAM_PUBLISH_STATE.
  newState | The current publishing state: #STREAM_PUBLISH_STATE.
  elapseSinceLastState | The time elapsed (ms) from the previous state to the current state.

## ◆ onSnapshotTaken() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onSnapshotTaken

Reports the result of taking a video snapshot.

After a successful `takeSnapshot` method call, the SDK triggers this callback to report whether the snapshot is successfully taken, as well as the details for that snapshot.

Parameters

  uid | The user ID. A `uid` of 0 indicates the local user.
  filePath | The local path of the snapshot.
  width | The width (px) of the snapshot.
  height | The height (px) of the snapshot.
  errCode | The message that confirms success or gives the reason why the snapshot is not successfully taken: 0: Success. < 0: Failure. -1: The SDK fails to write data to a file or encode a JPEG image. -2: The SDK does not find the video stream of the specified user within one second after the `takeSnapshot` method call succeeds. -3: Calling the `takeSnapshot` method too frequently. Call the `takeSnapshot` method after receiving the `onSnapshotTaken` callback from the previous call.

## ◆ onVideoRenderingTracingResult() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onVideoRenderingTracingResult

Reports the tracing result of video rendering event of the user.

Parameters

  uid | The user ID.
  currentEvent | The current event of the tracing result: #MEDIA_TRACE_EVENT.
  tracingInfo | The tracing result: #VideoRenderingTracingInfo.

## ◆ onSetRtmFlagResult() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onSetRtmFlagResult

Occurs when the SDK receives RTM setting change response.

@technical preview

Parameters

  code | The error code.

## ◆ onTranscodedStreamLayoutInfo() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onTranscodedStreamLayoutInfo

Occurs when receive a video transcoder stream which has video layout info.

Parameters

  uid | user id of the transcoded stream.
  width | width of the transcoded stream.
  height | height of the transcoded stream.
  layoutCount | count of layout info in the transcoded stream.
  layoutlist | video layout info list of the transcoded stream.

## ◆ onAudioMetadataReceived() [2/2]

virtual void agora::rtc::IRtcEngineEventHandler::onAudioMetadataReceived

Occurs when the SDK receives audio metadata.

Since
  v4.3.1

Parameters

  uid | ID of the remote user.
  metadata | The pointer of metadata
  length | Size of metadata @technical preview