TRTCLiveRoom is based on Tencent Real-Time Communication (TRTC) and Instant Messaging (IM). Its features include:

• A user can create a room and start live streaming, or enter a room as audience.
• The anchor and audience in a room can co-anchor with each other.
• Anchors in two rooms can compete and interact with each other.
• All users can send text and custom messages. Custom messages can be used to send on-screen comments, give likes, and send gifts.

TRTCLiveRoom is an open-source class depending on two closed-source Tencent Cloud SDKs. For the specific implementation process, please see Interactive Live Video Streaming (Flutter).

• TRTC SDK: the TRTC SDK is used as the low-latency live streaming component.
• IM SDK: the AVChatRoom feature of the IM SDK is used to implement chat rooms, and IM messages are used to facilitate the co-anchoring process between anchors.

TRTCLiveRoom API Overview

Basic SDK APIs

API	Description
sharedInstance	Gets a singleton object.
destroySharedInstance	Terminates a singleton object.
registerListener	Registers an event listener.
unRegisterListener	Removes an event listener.
login	Logs in.
logout	Logs out.
setSelfProfile	Sets profile.

Room APIs

API	Description
createRoom	Creates a room (called by anchor). If the room does not exist, the system will automatically create a room.
destroyRoom	Closes a room (called by anchor).
enterRoom	Enters a room (called by audience).
exitRoom	Exits a room (called by audience).
getRoomInfos	Gets room list details.
getAnchorList	Gets the anchor and co-anchors in a room. This API works only if it is called after enterRoom().
getRoomMemberList	Gets the list of all users in a room. This API works only if it is called after enterRoom().

Stream pushing/pulling APIs

API	Description
startCameraPreview	Enables preview of local video.
stopCameraPreview	Stops local video capturing and preview.
startPublish	Starts live streaming (pushing streams).
stopPublish	Stops live streaming (pushing streams).
startPlay	Plays a remote video. This API can be called in common playback and co-anchoring scenarios.
stopPlay	Stops rendering a remote video.

APIs for co-anchoring between anchors and audience

API	Description
requestJoinAnchor	Requests co-anchoring (called by audience).
responseJoinAnchor	Responds to a co-anchoring request (called by anchor).
kickoutJoinAnchor	Removes a user from co-anchoring (called by anchor).

APIs for cross-room anchor competition

API	Description
requestRoomPK	Requests cross-room competition (called by anchor).
responseRoomPK	Responds to a cross-room competition request (called by anchor).
quitRoomPK	Quits cross-room competition.

Audio/Video APIs

API	Description
switchCamera	Switches between the front and rear cameras.
setMirror	Sets the mirror mode.
muteLocalAudio	Mutes/Unmutes the local user.
muteRemoteAudio	Mutes/Unmutes a remote user.
muteAllRemoteAudio	Mutes/Unmutes all remote users.

Background music and audio effect APIs

API	Description
getAudioEffectManager	Gets the background music and audio effect management object TXAudioEffectManager.

Beauty filter APIs

API	Description
getBeautyManager	Gets the beauty filter management object TXBeautyManager.

Message sending APIs

API	Description
sendRoomTextMsg	Broadcasts a text message in a room. This API is generally used for on-screen comments.
sendRoomCustomMsg	Sends a custom text message.

TRTCLiveRoomDelegate API Overview

Common event callback APIs

API	Description
onError	Error
onWarning	Warning
onKickedOffline	You were kicked offline because another user logged in to the account.

Room event callback APIs

API	Description
onEnterRoom	You entered the room.
onUserVideoAvailable	Whether a remote user has playable video in the primary stream (usually used for camera images)
onRoomDestroy	The room was closed.

Callback APIs for anchors and audience

API	Description
onAnchorEnter	An anchor entered the room.
onAnchorExit	An anchor left the room.
onAudienceEnter	A viewer entered the room.
onAudienceExit	A viewer left the room.

Callback APIs for co-anchoring between anchors and audience

API	Description
onRequestJoinAnchor	A co-anchoring request was received.
onAnchorAccepted	The co-anchoring request was accepted.
onAnchorRejected	The co-anchoring request was rejected.
onKickoutJoinAnchor	A user was removed from co-anchoring.

Anchor competition callback APIs

API	Description
onRequestRoomPK	A cross-room competition request was received.
onRoomPKAccepted	The cross-room competition request was accepted.
onRoomPKRejected	The cross-room competition request was rejected.
onQuitRoomPK	The cross-room competition ended.

Message event callback APIs

API	Description
onRecvRoomTextMsg	Receipt of a text message
onRecvRoomCustomMsg	Receipt of a custom message

Basic SDK APIs

sharedInstance

This API is used to get a TRTCLiveRoom singleton object.

static Future<TRTCLiveRoom> sharedInstance()

destroySharedInstance

This API is used to terminate a TRTCLiveRoom singleton object.

Note：

After the instance is terminated, the externally cached TRTCLiveRoom instance can no longer be used. You need to call sharedInstance again to get a new instance.

static void destroySharedInstance()

registerListener

This API is used to get the event callback of TRTCLiveRoom. You can use TRTCLiveRoomDelegate to get various status notifications of TRTCLiveRoom.

void registerListener(VoiceListenerFunc func);

Note：

registerListener is the delegate callback of TRTCLiveRoom.

unRegisterListener

This API is used to remove the event listener.

void unRegisterListener(VoiceListenerFunc func);

login

This API is used to log in.

Future<ActionCallback> login(
    int sdkAppId, String userId, String userSig, TRTCLiveRoomConfig config);

The parameters are as detailed below:

Parameter	Type	Description
sdkAppId	int	You can view the SDKAppID via Application Management > Application Info in the TRTC console.
userId	String	ID of the current user, which is a string that can contain only letters (a-z and A-Z), digits (0-9), hyphens (-), and underscores (_).
userSig	String	Tencent Cloud's proprietary security signature. For how to obtain it, please see UserSig.
config	TRTCLiveRoomConfig	Global configuration information, which needs to be initialized during login and cannot be modified afterwards. useCDNFirst: specifies the way audience watch live streams. true means watching over CDNs, which is cost-efficient but has high latency. false means watching under the low latency mode, the cost of which is between that of CDN live streaming and co-anchoring, but the latency is lower than 1 second. CDNPlayDomain: specifies the domain name for CDN live streaming. It takes effect only if useCDNFirst is set to true. You can set it in Domain Management of the CSS console.

logout

This API is used to log out.

Future<ActionCallback> logout();

setSelfProfile

This API is used to set profile.

Future<ActionCallback> setSelfProfile(String userName, String avatarURL);

The parameters are as detailed below:

Parameter	Type	Description
userName	String	Nickname
avatarURL	String	Profile photo address

Room APIs

createRoom

This API is used to create a room (called by anchor).

Future<ActionCallback> createRoom(int roomId, TRTCCreateRoomParam roomParam);

The parameters are as detailed below:

Parameter	Type	Description
roomId	int	Room ID. You need to assign and manage the IDs in a centralized manner. Multiple roomId values can be aggregated into a live room list. Currently, Tencent Cloud does not provide list management services. Please manage the list on your own.
roomParam	RoomParam	Room information, such as room name and cover information. If both the room list and room information are managed on your server, you can ignore this parameter.

The process of creating a room and starting live streaming as an anchor is as follows:

1. A user calls startCameraPreview() to enable camera preview and set beauty filters.
2. The user calls createRoom() to create a room, the result of which is returned via the ActionCallback callback.
3. The user calls starPublish() to push streams.

destroyRoom

This API is used to close a room (called by anchor).

Future<ActionCallback> destroyRoom();

enterRoom

This API is used to enter a room (called by audience).

Future<ActionCallback> enterRoom(int roomId);

The parameters are as detailed below:

Parameter	Type	Description
roomId	int	Room ID

The process of entering a room and starting playback as audience is as follows:

1. A user gets the latest room list from your server. The list may contain roomId and other room information of multiple rooms.
2. The user selects a room and calls enterRoom() to enter the room.
3. The user calls startPlay(userId), passing in the anchor's userId to start playback.
   • If the room list contains the anchor's userId, the user can call startPlay(userId) to start playback.
   • If the user does not have the anchor's userId before room entry, he or she can find it in the onAnchorEnter(userId) callback of TRTCLiveRoomDelegate, which is returned after room entry. The user can then call startPlay(userId) to start playback.

exitRoom

This API is used to leave a room.

Future<ActionCallback> exitRoom();

getRoomInfos

This API is used to get room list details, which are set by anchors via roomInfo when they call createRoom().

Note：

You don't need this API if both the room list and room information are managed on your server.

Future<RoomInfoCallback> getRoomInfos(List<String> roomIdList);

The parameters are as detailed below:

Parameter	Type	Description
roomIdList	List&dxlt;String&dxgt;	Room ID list

getAnchorList

This API is used to get the anchor and co-anchors in a room. It takes effect only if it is called after enterRoom().

Future<UserListCallback> getAnchorList();

getRoomMemberList

This API is used to get the information of all audience in the room. It takes effect only if it is called after enterRoom().

Future<UserListCallback> getRoomMemberList(int nextSeq)

The parameters are as detailed below:

Parameter	Type	Description
nextSeq	int	Pulling-by-page flag. It is set to 0 when the information is pulled for the first time. If the callback succeeds and nextSeq is not 0, pagination is needed. The value of this field is passed in for the next pull until the value becomes 0.

Stream Pushing/Pulling APIs

startCameraPreview

This API is used to enable local video preview.

Future<void> startCameraPreview(bool isFrontCamera, int viewId);

The parameters are as detailed below:

Parameter	Type	Description
isFrontCamera	bool	true: turns the front camera on; false: turns the rear camera on.
viewId	int	Called back video view ID

stopCameraPreview

This API is used to stop local video capturing and preview.

Future<void> stopCameraPreview();

startPublish

This API is used to start live streaming (pushing streams), which can be called in the following scenarios:

• An anchor starts live streaming.
• A viewer starts co-anchoring.

Future<void> startPublish(String streamId);

The parameters are as detailed below:

Parameter	Type	Description
streamId	String?	The streamId used to bind live streaming CDNs. You need to specify the streamId of the anchor if you want audience to play the anchor's streams via live streaming CDNs.

stopPublish

This API is used to stop live streaming (pushing streams), which can be called in the following scenarios:

• An anchor ends live streaming.
• A viewer ends co-anchoring.

Future<void> stopPublish();

startPlay

This API is used to play a remote video. It can be called in common playback and co-anchoring scenarios.

Future<void> startPlay(String userId, int viewId);

The parameters are as detailed below:

Parameter	Type	Description
userId	String	ID of the user whose video is to be played
viewId	int	Called back video view ID

• Common playback:

  • If the room list contains the anchor's userId, audience can call startPlay(userId) to play the anchor's video after enterRoom().
  • If audience do not have the anchor's userId before room entry, they can find it in the onAnchorEnter(userId) callback of TRTCLiveRoomDelegate, which is returned after room entry. They can then call startPlay(userId) to play the anchor's video.

• Co-anchoring:
  After co-anchoring is initiated, the anchor will receive the onAnchorEnter(userId) callback from TRTCLiveRoomDelegate and can call startPlay(userId), passing in theuserId` returned by the callback to play co-anchoring video.

stopPlay

This API is used to stop rendering remote video. It needs to be called when the onAnchorExit() callback is received.

Future<void> stopPlay(String userId);

The parameters are as detailed below:

Parameter	Type	Description
userId	String	ID of the remote user

APIs for Co-anchoring Between Anchor and Audience

requestJoinAnchor

This API is used by audience to send a co-anchoring request.

Future<ActionCallback> requestJoinAnchor();

The process of co-anchoring between anchor and audience is as follows:

1. A viewer calls requestJoinAnchor() to send a co-anchoring request to the anchor.
2. The anchor receives the onRequestJoinAnchor() callback of TRTCLiveRoomDelegate.
3. The anchor calls responseJoinAnchor() to accept or reject the co-anchoring request.
4. The viewer receives the responseCallback callback, which carries the anchor's response.
5. If the request is accepted, the viewer calls startCameraPreview() to enable local camera preview.
6. The viewer calls startPublish() to push streams.
7. After the viewer starts pushing streams, the anchor receives the onAnchorEnter() callback of TRTCLiveRoomDelegate.
8. The anchor calls startPlay() to play the co-anchoring viewer's video.
9. If there are other viewers co-anchoring with the anchor in the room, the new co-anchoring viewer will receive the onAnchorEnter() callback and can call startPlay() to play other co-anchoring viewers' video.

responseJoinAnchor

This API is used by anchors to respond to a co-anchoring request after receiving the onRequestJoinAnchor() callback of TRTCLiveRoomDelegate.

Future<ActionCallback> responseJoinAnchor(String userId, boolean agreee);

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the viewer
agree	bool	true: accepts; false: rejects.

kickoutJoinAnchor

This API is used by anchors to remove a user from co-anchoring. After this API is called, the removed user will receive the onKickoutJoinAnchor() callback of TRTCLiveRoomDelegate.

Future<ActionCallback> kickoutJoinAnchor(String userId);

The parameters are as detailed below:

Parameter	Type	Description
userId	String	ID of the co-anchoring user

APIs for Cross-Room Anchor Competition

requestRoomPK

This API is used by anchors to request cross-room competition.

Future<ActionCallback> requestRoomPK(int roomId, String userId);

The parameters are as detailed below:

Parameter	Type	Description
roomId	int	Room ID of the anchor to call
userId	String	User ID of the anchor to call

Two anchors in different rooms can compete with each other. The process is as follows:

1. Anchor A calls requestRoomPK() to send a co-anchoring request to anchor B.
2. Anchor B receives the onRequestRoomPK() callback of TRTCLiveRoomDelegate.
3. Anchor B calls responseRoomPK() to respond to the competition request.
4. After accepting the request, anchor B waits for the onAnchorEnter() callback of TRTCLiveRoomDelegate and calls startPlay() to play anchor A's video.
5. Anchor A receives the onRoomPKAccepted or onRoomPKRejected callback.
6. If the request is accepted, anchor A waits for the onAnchorEnter() callback of TRTCLiveRoomDelegate and calls startPlay() to play anchor B's video.

responseRoomPK

This API is used by anchors to respond to a cross-room competition request, after which the request sending anchor will receive the responseCallback callback, which carries the response passed in to requestRoomPK.

Future<ActionCallback> responseRoomPK(String userId, boolean agree);

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the anchor sending the competition request
agree	bool	true: accepts; false: rejects.

quitRoomPK

This API is used to quit cross-room competition. If either anchor quits cross-room competition, the other anchor will receive the onQuitRoomPk() callback of TRTCLiveRoomDelegate.

Future<ActionCallback> quitRoomPK();

Audio/Video APIs

switchCamera

This API is used to switch between the front and rear cameras.

Future<void> switchCamera(boolean isFrontCamera);

setMirror

This API is used to set the mirror mode.

Future<void> setMirror(boolean isMirror);

The parameters are as detailed below:

Parameter	Type	Description
isMirror	bool	Enables/Disables mirroring.

muteLocalAudio

This API is used to mute or unmute the local user.

Future<void> muteLocalAudio(boolean mute);

The parameters are as detailed below:

Parameter	Type	Description
mute	boolean	true: mute; false: unmute

muteRemoteAudio

This API is used to enable the hands-free mode.

Future<void> muteRemoteAudio(String userId, boolean mute);

The parameters are as detailed below:

Parameter	Type	Description
userId	String	ID of the remote user
mute	boolean	true: mute; false: unmute

muteAllRemoteAudio

This API is used to mute or unmute all remote users.

Future<void> muteAllRemoteAudio(boolean mute);

The parameters are as detailed below:

Parameter	Type	Description
mute	boolean	true: mute; false: unmute

Background Music and Audio Effect APIs

getAudioEffectManager

This API is used to get the background music and audio effect management object TXAudioEffectManager.

getAudioEffectManager();

Beauty Filter APIs

getBeautyManager

This API is used to get the beauty filter management object TXBeautyManager.

getBeautyManager();

You can do the following using TXBeautyManager:

• Set the beauty filter style and apply effects including skin brightening, rosy skin, eye enlarging, face slimming, chin slimming, chin lengthening/shortening, face shortening, nose narrowing, eye brightening, teeth whitening, eye bag removal, wrinkle removal, and smile line removal.
• Adjust the hairline, eye spacing, eye corners, lip shape, nose wings, nose position, lip thickness, and face shape.
• Apply animated effects such as face widgets (materials).
• Add makeup effects.
• Recognize gestures.

Message Sending APIs

sendRoomTextMsg

This API is used to broadcast a text message in a room, which is generally used for on-screen comments.

Future<ActionCallback> sendRoomTextMsg(String message);

The parameters are as detailed below:

Parameter	Type	Description
message	String	Text message

sendRoomCustomMsg

This API is used to send a custom text message.

Future<ActionCallback> sendRoomCustomMsg(String cmd, String message);

The parameters are as detailed below:

Parameter	Type	Description
cmd	String	Custom command word used to distinguish between different message types
message	String	Text message

TRTCLiveRoomDelegate Event Callback APIs

Common Event Callback APIs

onError

Callback for error.

Note：

This callback indicates that the SDK encountered an unrecoverable error. Such errors must be listened for, and UI reminders should be sent to users if necessary.

The parameters are as detailed below:

Parameter	Type	Description
errCode	int	Error code
errMsg	String	Error message

onWarning

Callback for warning.

The parameters are as detailed below:

Parameter	Type	Description
warningCode	int	Warning code
warningMsg	String	Warning message

onKickedOffline

Callback for being kicked offline because another user logged in to the same account.

Room Event Callback APIs

onRoomDestroy

Callback for room closing. All users in the room will receive this callback after the anchor leaves the room.

onEnterRoom

Callback for room entry by the local user.

The parameters are as detailed below:

Parameter	Type	Description
result	int	If result is greater than 0, it indicates the time (ms) room entry took; if result is less than 0, it represents the error code for room entry.

onUserVideoAvailable

Callback for whether a remote user has playable video in the primary stream (usually used for camera images).

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID
available	boolean	Whether the user's video is enabled

Callback APIs for Anchors and Audience

onAnchorEnter

Callback for a new anchor/co-anchoring viewer. Audience will receive this callback when there is a new anchor/co-anchoring viewer in the room and can call startPlay() of TRTCLiveRoom to play the video of the anchor/co-anchoring viewer.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the new anchor/co-anchoring viewer
userName	String	Username
userAvatar	String	Profile photo address

onAnchorExit

Callback for the quitting of a competing anchor/co-anchoring viewer. The anchor and co-anchoring viewers in a room will receive this callback after a competing anchor/co-anchoring viewer quits co-anchoring and can call stopPlay() of TRTCLiveRoom to stop playing the video of the competing anchor/co-anchoring viewer.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	ID of the user who quitted co-anchoring
userName	String	Username
userAvatar	String	Profile photo address

onAudienceEnter

Callback for room entry by a viewer.

void onAudienceEnter(TRTCLiveRoomDef.TRTCLiveUserInfo userInfo);

The parameters are as detailed below:

Parameter	Type	Description
userInfo	TRTCLiveRoomDef.TRTCLiveUserInfo	Information of the viewer who enters the room, such as user ID, nickname, and profile photo.

onAudienceExit

Callback for room exit by a viewer.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the viewer
userName	String	Username
userAvatar	String	Profile photo address

onRequestJoinAnchor

Callback for receiving a co-anchoring request from a viewer.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	ID of the request sending user
userName	String	Username
userAvatar	String	Profile photo address

onAnchorAccepted

Callback for accepting a co-anchoring request.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the anchor

onAnchorRejected

Callback for rejecting a co-anchoring request.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the anchor

onKickoutJoinAnchor

Callback for being removed from co-anchoring. A co-anchoring viewer needs to call stopPublish() of TRTCLiveRoom to quit co-anchoring after receiving this callback.

Anchor Competition Callback APIs

onRequestRoomPK

Callback for receiving a cross-room competition request. If an anchor accepts the request after receiving this callback, he or she should wait for the onAnchorEnter() callback of TRTCLiveRoomDelegate and call startPlay() to play the other anchor's video.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the request sending anchor
userName	String	Username
userAvatar	String	Profile photo address

onRoomPKAccepted

Callback for accepting a cross-room competition request.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the anchor who accepted the request

onRoomPKRejected

Callback for rejecting a cross-room competition request.

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID of the anchor who rejected the request

onQuitRoomPK

Callback for ending cross-room competition.

Message Event Callback APIs

onRecvRoomTextMsg

A text message was received.

The parameters are as detailed below:

Parameter	Type	Description
message	String	Text message

onRecvRoomCustomMsg

A custom message was received.

The parameters are as detailed below:

Parameter	Type	Description
command	String	Custom command word used to distinguish between different message types
message	String	Text message