TRTCCloudListener enum Null safety

Camera is ready

The connection between SDK and server is closed

The connection between SDK and server has been restored

Callback for the result of requesting cross-room call (anchor competition)

Calling the connectOtherRoom() API in TRTCCloud will establish a video call between two anchors in two different rooms, i.e., the "anchor competition" feature. The caller will receive the onConnectOtherRoom() callback to see whether the cross-room call is successful; and if so, all users in both rooms will receive the onUserVideoAvailable() callback for anchor competition.

param:

userId userId of the target anchor to compete with.

errCode Error code. ERR_NULL indicates a successful switch. For more information, please see Error Codes.

errMsg Error message

Callback for local device connection and disconnection

Note: this callback only supports Windows and macOS platforms

Parameters

deviceId Device ID

type Device type

state Event type

Callback for the result of ending cross-room call (anchor competition)

Callback for room entry

After the enterRoom() API in TRTCCloud is called to enter a room, the onEnterRoom(result) callback will be received from the SDK.

If room entry succeeded, result will be a positive number (result > 0), indicating the time in milliseconds (ms) used for entering the room.

If room entry failed, result will be a negative number (result < 0), indicating the error code for room entry failure.

param:

If result is greater than 0, it will be the time used for room entry in ms; if result is smaller than 0, it will be room entry error code.

Error callback, which indicates that the SDK encountered an irrecoverable error and must be listened on. Corresponding UI reminders should be displayed based on the actual conditions

param:

errCode Error code

errMsg Error message

extraInfo Extended field. Certain error codes may carry extra information for troubleshooting

Callback for room exit

When the exitRoom() API in TRTCCloud is called, the logic related to room exit will be executed, such as releasing resources of audio/video devices and codecs. After resources are released, the SDK will use the onExitRoom() callback to notify you.

If you need to call enterRoom() again or switch to another audio/video SDK, please wait until you receive the onExitRoom() callback; otherwise, exceptions such as occupied audio device may occur.

param:

reason Reason for exiting the room. 0: the user actively called exitRoom to exit the room; 1: the user was kicked out of the room by the server; 2: the room was dismissed.

Playback of the first audio frame of a remote user starts (local audio is not supported for notification currently)

param:

userId Remote user ID

Rendering of the first frame of a local or remote user starts

If userId is null, it indicates that the captured local camera image starts to be rendered, which needs to be triggered by calling startLocalPreview first. If userId is not null, it indicates that the first video frame of the remote user starts to be rendered, which needs to be triggered by calling startRemoteView first.

This callback will be triggered only after startLocalPreview(), startRemoteView(), or startRemoteSubStreamView() is called.

param:

userId ID of the local or remote user. userId == null indicates the ID of the local user, while userId != null indicates the ID of a remote user.

streamType Video stream type: camera or screen sharing.

width Image width

height Image height

Mic is ready

Callback for loss of custom message

TRTC uses the UDP channel; therefore, even if reliable transfer is set, it cannot guarantee that no message will be lost; instead, it can only reduce the message loss rate to a very small value and meet general reliability requirements. After reliable transfer is set on the sender, the SDK will use this callback to notify of the number of custom messages lost during transfer in the specified past time period (usually 5s).

Note:

Only when reliable transfer is set on the sender can the receiver receive the callback for message loss.

param:

userId User ID

cmdID Data stream ID

errCode Error code. The value is -1 on the current version

missed Number of lost messages

Background music playback end

Background music playback progress

Background music playback start

Network quality: this callback is triggered once every 2 seconds to collect statistics of the current network upstreaming and downstreaming quality

userId is the local user ID, indicating the current local video quality

param:

localQuality Upstream network quality

remoteQuality Downstream network quality

Callback for receipt of custom message

When a user in a room uses sendCustomCmdMsg to send a custom message, other users in the room can receive the message through the onRecvCustomCmdMsg API.

param:

userId User ID

cmdID Command ID

seq Message serial number

message Message data

Callback for receipt of SEI message

When a user in a room uses sendSEIMsg to send data, other users in the room can receive the data through the onRecvSEIMsg API.

param:

userId User ID

message Data

A user enters the current room

For the sake of performance, the behaviors of this notification will be different in two different application scenarios:

Call scenario (TRTCCloudDef.TRTC_APP_SCENE_VIDEOCALL or TRTCCloudDef.TRTC_APP_SCENE_AUDIOCALL): users in this scenario do not have different roles, and this notification will be triggered whenever a user enters the room.

Live streaming scenario (TRTCCloudDef.TRTC_APP_SCENE_LIVE or TRTCCloudDef.TRTC_APP_SCENE_VOICE_CHATROOM): this scenario does not limit the number of audience users. If any user entering or exiting the room could trigger the callback, it would cause great performance loss. Therefore, this notification will be triggered only when an anchor rather than an audience user enters the room.

param:

userId User ID

A user exits the current room

Similar to onRemoteUserEnterRoom, the behaviors of this notification will be different in two different application scenarios:

Call scenario (TRTCCloudDef.TRTC_APP_SCENE_VIDEOCALL or TRTCCloudDef.TRTC_APP_SCENE_AUDIOCALL): users in this scenario do not have different roles, and this notification will be triggered whenever a user exits the room.

Live streaming scenario (TRTCCloudDef.TRTC_APP_SCENE_LIVE or TRTCCloudDef.TRTC_APP_SCENE_VOICE_CHATROOM`): this notification will be triggered only when an anchor rather than an audience user exits the room.

param:

userId User ID

reason Reason for exiting the room. 0: the user proactively exited the room; 1: the user exited the room due to timeout; 2: the user was kicked out of the room.

This callback will be returned by the SDK when screen sharing is paused

Parameters

reason Reason. 0: the user paused proactively; 1: screen sharing was paused as the screen window became invisible

Note: the value called back is only valid for iOS

This callback will be returned by the SDK when screen sharing is resumed

Parameters

reason Reason for resumption. 0: the user resumed proactively; 1: screen sharing was resumed as the screen window became visible

Note: the value called back is only valid for iOS

This callback will be returned by the SDK when screen sharing is started

This callback will be returned by the SDK when screen sharing is stopped

Parameters

reason Reason for stop. 0: the user stopped proactively; 1: screen sharing stopped as the shared window was closed

The first local audio frame data has been sent

The SDK will start capturing the mic and encoding the captured audio after successful call of enterRoom() and startLocalAudio(). This callback event will be returned after the SDK successfully sends the first audio frame data to the cloud.

The first local audio frame data has been sent

The SDK will start capturing the camera and encode the captured image after successful call of enterRoom() and startLocalPreview(). This callback event will be returned after the SDK successfully sends the first video frame data to the cloud.

param:

streamType Video stream type: big image, small image, or substream image (screen sharing)

Callback for setting On-Cloud MixTranscoding parameters, which corresponds to the setMixTranscodingConfig() API in TRTCCloud

param:

errCode 0: success; other values: failure

errMsg Specific cause of error

Callback for screencapturing completion

Parameters

errCode of 0: success; other values: failure

Callback for server speed test. SDK tests the speed of multiple server IPs, and the test result of each IP is returned through this callback notification

param:

currentResult Current speed test result

finishedCount Number of servers on which speed test has been performed

totalCount Total number of servers on which speed test needs to be performed

Callback for completion of starting relayed push to CDN

This callback corresponds to the startPublishCDNStream() API in TRTCCloud

Note: if Start callback is successful, the relayed push request has been successfully sent to Tencent Cloud. If the target CDN is exceptional, relayed push may fail.

param:

errCode 0: success; other values: failure

errMsg Specific cause of error

Callback for starting pushing to Tencent Cloud CSS CDN, which corresponds to the startPublishing() API in TRTCCloud

param:

errCode 0: success; other values: failure

errMsg Specific cause of error

Callback for technical metric statistics

If you are familiar with audio/video terms, you can use this callback to get all technical metrics of the SDK. If you are developing an audio/video project for the first time, you can focus only on the onNetworkQuality callback.

Note: the callback is triggered once every 2 seconds

param:

statics Status data

Callback for completion of stopping relayed push to CDN

This callback corresponds to the stopPublishCDNStream() API in TRTCCloud

param:

errCode 0: success; other values: failure

errMsg Specific cause of error

Callback for stopping pushing to Tencent Cloud CSS CDN, which corresponds to the stopPublishing() API in TRTCCloud

param:

errCode 0: success; other values: failure

errMsg Specific cause of error

Callback for role switch

Calling the switchRole() API in TRTCCloud will switch between the anchor and audience roles, which will be accompanied by a line switch process. After the SDK switches the roles, the onSwitchRole() event callback will be returned.

param:

errCode Error code. 0 indicates a successful switch

errMsg Error message

Callback for the result of room switching (switchRoom)

param:

errCode Error code

errMsg Error message

Callback for mic test volume

The mic test API startMicDeviceTest will trigger this callback

Note: this callback only supports Windows and macOS platforms

Parameters:

volume Volume value between 0 and 100

Callback for speaker test volume

The speaker test API startSpeakerDeviceTest will trigger this callback

Note: this callback only supports Windows and macOS platforms

Parameters:

volume Volume value between 0 and 100

The SDK tries to connect to the server again

Whether the remote user has playable audio data

param:

userId User ID

available Whether audio is enabled

Whether the remote user has a playable substream image (generally for screen sharing)

param:

userId User ID

available Whether screen sharing is enabled

Whether the remote user has a playable primary image (generally for camera)

When the onUserVideoAvailable(userId, true) notification is received, it indicates that available video data frames of the specified image channel have arrived. At this time, the startRemoteView(userid) API needs to be called to load the image of the remote user. Then, the callback for rendering the first video frame, i.e., onFirstVideoFrame(userid), will be received.

When the onUserVideoAvailable(userId, false) notification is received, it indicates that the specified channel of remote image has been disabled, which may be because the user called muteLocalVideo() or stopLocalPreview().

param:

userId User ID

available Whether image is enabled

Callback for volume, including the volume of each userId and total remote volume

The enableAudioVolumeEvaluation API in TRTCCloud can be used to enable this callback or set its triggering interval. It should be noted that after enableAudioVolumeEvaluation is called to enable the volume callback, no matter whether there is a user speaking in the channel, the callback will be called at the set time interval. If there is no one speaking, userVolumes will be empty, and totalVolume will be 0.

Note: if userId is the local user ID, it indicates the volume of the local user. userVolumes only includes the volume information of users who are speaking (i.e., volume is not 0).

param:

userVolumes Volume of all members who are speaking in the room. Value range: 0–100.

totalVolume Total volume of all remote members. Value range: 0–100.

Warning callback. This callback is used to alert you of some non-serious problems such as lag or recoverable decoding failure

param:

warningCode Warning code

warningMsg Warning message

extraInfo Extended field. Certain warning codes may carry extra information for troubleshooting

A constant List of the values in this enum, in order of their declaration.

The integer index of this enum.