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

• A user can create a room and start streaming as the room owner, or enter a room as audience to listen or sing together with the room owner.
• The room owner can manage song requests, invite a listener to speak, remove a speaker, and start a duet.
• The room owner can also block a seat. Listeners cannot request to take a blocked seat.
• A listener can request to sing and become the co-singer, and the co-singer can become a listener after a duet ends.
• All users can send gifts and text and custom messages. Custom messages can be used to send on-screen comments and give likes.

TRTCChorusRoom is an open-source class depending on two closed-source Tencent Cloud SDKs. For the specific implementation process, please see Duet (Android).

• TRTC SDK: the TRTC SDK is used as a low-latency audio chat component.
• IM SDK: the AVChatRoom feature of the IM SDK is used to implement chat rooms. The attribute APIs of IM are used to store room information such as the seat list, and invitation signaling is used to send requests to speak or invite others to speak.

TRTCChorusRoom API Overview

Basic SDK APIs

API	Description
sharedInstance	Gets a singleton object.
destroySharedInstance	Terminates a singleton object.
setDelegate	Sets event callbacks.
delegateQueue	Sets the thread where event callbacks are.
login	Logs in.
logout	Logs out.
setSelfProfile	Sets the profile.

Room APIs

API	Description
createRoom	Creates a room (called by room owner). If the room does not exist, the system will automatically create a room.
destroyRoom	Terminates a room (called by room owner).
enterRoom	Enters a room (called by listener).
exitRoom	Exits a room (called by listener).
getRoomInfoList	Gets room list details.
getUserInfoList	Gets the user information of the specified userId. If the value is nil, the information of all users in the room is obtained.

Music playback APIs

API	Description
startPlayMusic	Starts music playback.
stopPlayMusic	Stops music playback.
pausePlayMusic	Pauses music playback.
resumePlayMusic	Resumes music playback.

Seat management APIs

API	Description
enterSeat	Becomes a speaker (called by room owner or listener).
leaveSeat	Becomes a listener (called by speaker).
pickSeat	Places a user in a seat (called by room owner).
kickSeat	Removes a speaker (called by room owner).
closeSeat	Blocks/Unblocks a seat (called by room owner).

Local audio APIs

API	Description
startMicrophone	Starts mic capturing.
stopMicrophone	Stops mic capturing.
setAudioQuality	Sets audio quality.
muteLocalAudio	Mutes/Unmutes local audio.
setSpeaker	Sets whether to use the speaker or receiver.
setAudioCaptureVolume	Sets mic capturing volume.
setAudioPlayoutVolume	Sets playback volume.
setVoiceEarMonitorEnable	Enables/Disables in-ear monitoring.

Background music and audio effect APIs

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

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.

Invitation signaling APIs

API	Description
sendInvitation	Sends an invitation.
acceptInvitation	Accepts an invitation.
rejectInvitation	Declines an invitation.
cancelInvitation	Cancels an invitation.

`TRTCChorusRoomDelegate` API Overview

Common event callback APIs

API	Description
onError	Error
onWarning	Warning
onDebugLog	Log

Room event callback APIs

API	Description
onRoomDestroy	The room was terminated.
onRoomInfoChange	The room information changed.
onUserVolumeUpdate	User volume

Seat list change callback APIs

API	Description
onSeatListChange	All seat changes
onAnchorEnterSeat	Someone became a speaker or was made a speaker by the room owner.
onAnchorLeaveSeat	Someone became a listener or was moved to listeners by the room owner.
onUserMicrophoneMute	Whether a user’s mic is muted
onSeatClose	The room owner blocked a seat.

Callback APIs for room entry/exit by listener

API	Description
onAudienceEnter	A listener entered the room.
onAudienceExit	A listener exited the room.

Message event callback APIs

API	Description
onRecvRoomTextMsg	A text message was received.
onRecvRoomCustomMsg	A custom message was received.

Signaling event callback APIs

API	Description
onReceiveNewInvitation	A new invitation was received.
onInviteeAccepted	The invitee accepted the invitation.
onInviteeRejected	The invitee declined the invitation.
onInvitationCancelled	The inviter canceled the invitation.

Song event callback APIs

API	Description
onMusicProgressUpdate	Music playback progress
onMusicPrepareToPlay	Music playback is ready.
onMusicCompletePlaying	Music playback was completed.
onReceiveAnchorSendChorusMsg	The room owner sent a duet message.

Basic SDK APIs

sharedInstance

This API is used to get a TRTCChorus singleton object.

/**
* Get a `TRTCChorus` singleton object
*
* - returns: `TRTCChorus` instance
* - note: You can call {@link TRTCChorus#destroySharedInstance()} to terminate a singleton object.
*/
+ (instancetype)sharedInstance NS_SWIFT_NAME(shared());

destroySharedInstance

This API is used to terminate a TRTCChorus singleton object.

Note：

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

/**
* Terminate a `TRTCChorus` singleton object
*
* - note: After the instance is terminated, the externally cached `TRTCChorus` instance can no longer be used. You need to call {@link TRTCChorus#sharedInstance()} again to get a new instance.
*/
+ (void)destroySharedInstance NS_SWIFT_NAME(destroyShared());

setDelegate

This API is used to set the event callbacks of TRTCChorus. You can use TRTCChorusDelegate to get different status notifications of TRTCChorus.

/**
* Set the event callbacks of the component
* 
* You can use `TRTCChorusDelegate` to get different status notifications of `TRTCChorus`.
*
* - parameter delegate Callback API
* - note: Event callbacks in `TRTCChorus` are sent to you in the main queue by default. If you need to specify a queue for event callbacks, please use {@link TRTCChorus#setDelegateQueue(queue)}.
*/
- (void)setDelegate:(id<TRTCChorusDelegate>)delegate NS_SWIFT_NAME(setDelegate(delegate:));

Note：

setDelegate is the delegate callback of TRTCChorus.

setDelegateQueue

This API is used to set the thread queue for event callbacks. The main thread (MainQueue) is used by default.

/**
* Set the queue for event callbacks
*
* - parameter queue. The status notifications of `TRTCChorus` will be sent to the queue you specify.
*/
- (void)setDelegateQueue:(dispatch_queue_t)queue NS_SWIFT_NAME(setDelegateQueue(queue:));

The parameters are as detailed below:

Parameter	Type	Description
queue	dispatch_queue_t	The status notifications of TRTCChorus will be sent to the thread queue you specify.

login

This API is used to log in.

- (void)login:(int)sdkAppID
     userId:(NSString *)userId
    userSig:(NSString *)userSig
   callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(login(sdkAppID:userId:userSig:callback:));

The parameters are as detailed below:

Parameter	Type	Description
sdkAppId	int	You can view SDKAppID in Application Management > Application Info of 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 more information on how to get it, please see UserSig.
callback	ActionCallback	Callback for login. The code is 0 if login succeeds.

logout

This API is used to log out.

- (void)logout:(ActionCallback _Nullable)callback NS_SWIFT_NAME(logout(callback:));

The parameters are as detailed below:

Parameter	Type	Description
callback	ActionCallback	Callback for logout. The code is 0 if logout succeeds.

setSelfProfile

This API is used to set the profile.

- (void)setSelfProfile:(NSString *)userName avatarURL:(NSString *)avatarURL callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(setSelfProfile(userName:avatarURL:callback:));

The parameters are as detailed below:

Parameter	Type	Description
userName	String	Username
avatarURL	String	Profile photo URL
callback	ActionCallback	Callback for profile setting. The code is 0 if the operation succeeds.

Room APIs

createRoom

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

- (void)createRoom:(int)roomID roomParam:(RoomParam *)roomParam callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(createRoom(roomID:roomParam:callback:));

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 room list. Currently, Tencent Cloud does not provide management services for room lists. Please manage the list on your own.
roomParam	TRTCCreateRoomParam	Room information, such as room name, seat list information, and cover information. To manage seats, you must enter the number of seats in the room.
callback	ActionCallback	Callback for room creation. The code is 0 if the operation succeeds.

The process of creating a room and becoming a speaker is as follows:

1. A user calls createRoom to create a room, passing in room attributes (e.g., room ID, whether listeners need room owner’s consent to speak, number of seats).
2. After creating the room, the user calls enterSeat to become a speaker.
3. The user will receive an onSeatListChanget notification about the change of the seat list, and can update the change to the UI.
4. The user will also receive an onAnchorEnterSeat notification that someone became a speaker, and mic capturing will be enabled automatically.

destroyRoom

This API is used to terminate a room (called by room owner).

- (void)destroyRoom:(ActionCallback _Nullable)callback NS_SWIFT_NAME(destroyRoom(callback:));

The parameters are as detailed below:

Parameter	Type	Description
callback	ActionCallback	Callback for room termination. The code is 0 if the operation succeeds.

enterRoom

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

- (void)enterRoom:(NSInteger)roomID callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(enterRoom(roomID:callback:));

The parameters are as detailed below:

Parameter	Type	Description
roomId	int	Room ID
callback	ActionCallback	Callback for room entry. The code is 0 if the operation succeeds.

The process of entering a room as a listener is as follows:

1. A user gets the latest room list from your server. The list may contain the roomId and room information of multiple rooms.
2. The user selects a room, and calls enterRoom with the room ID passed in to enter.
3. After entering the room, the user receives an onRoomInfoChange notification about room attribute change from the component. The attributes can be recorded, and corresponding changes can be made to the UI, including room name, whether room owner’s consent is required for listeners to speak, etc.
4. The user will receive an onSeatListChange notification about the change of the seat list and can update the change to the UI.
5. The user will also receive an onAnchorEnterSeat notification that someone became a speaker.

exitRoom

This API is used to exit a room.

- (void)exitRoom:(ActionCallback _Nullable)callback NS_SWIFT_NAME(exitRoom(callback:));

The parameters are as detailed below:

Parameter	Type	Description
callback	ActionCallback	Callback for room exit. The code is 0 if the operation succeeds.

getRoomInfoList

This API is used to get room list details. The room name and cover are set by the room owner via roomInfo when calling createRoom().

Note：

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

- (void)getRoomInfoList:(NSArray<NSNumber *> *)roomIdList callback:(ChorusInfoCallback _Nullable)callback NS_SWIFT_NAME(getRoomInfoList(roomIdList:callback:));

The parameters are as detailed below:

Parameter	Type	Description
roomIdList	List<Integer>	Room ID list
callback	RoomInfoCallback	Callback of room details

getUserInfoList

This API is used to get the user information of a specified userId.

- (void)getUserInfoList:(NSArray<NSString *> * _Nullable)userIDList callback:(ChorusUserListCallback _Nullable)callback NS_SWIFT_NAME(getUserInfoList(userIDList:callback:));

The parameters are as detailed below:

Parameter	Type	Description
userIdList	List<String>	IDs of the users to query. If this parameter is null, the information of all users in the room is queried.
userlistcallback	UserListCallback	Callback of user details

Music Playback APIs

startPlayMusic

This API is used to play music (called after mic-on).

Note：

• After music playback starts, you will receive an onMusicPrepareToPlay notification.
• During music playback, all members in the room will keep receiving an onMusicProgressUpdate notification.
• After music playback stops, you will receive an onMusicCompletePlaying notification.

- (void)startPlayMusic:(int32_t)musicID url:(NSString *)url NS_SWIFT_NAME(startPlayMusic(musicID:url:));

The parameters are as detailed below:

Parameter	Type	Description
musicID	int32_t	Music ID
url	String	Absolute path of the music track

After this API is called, the song being played will stop.

stopPlayMusic

This API is used to stop music (called during music playback).

Note：

After music playback stops, you will receive an onMusicCompletePlaying notification.

- (void)stopPlayMusic NS_SWIFT_NAME(stopPlayMusic());

pausePlayMusic

This API is used to pause music (called during music playback).

Note：

• The onMusicProgressUpdate notification will be paused.
• No onMusicCompletePlaying notification will be received.

- (void)pausePlayMusic NS_SWIFT_NAME(pausePlayMusic());

resumePlayMusic

This API is used to resume music (called after pause).

Note：

No onMusicPrepareToPlay notification will be received.

- (void)resumePlayMusic NS_SWIFT_NAME(resumePlayMusic());

Seat Management APIs

enterSeat

This API is used to become a speaker (called by room owner or listener).

Note：

After a user becomes a speaker, all members in the room will receive an onSeatListChange notification and an onAnchorEnterSeat notification.

- (void)enterSeat:(NSInteger)seatIndex callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(enterSeat(seatIndex:callback:));

The parameters are as detailed below:

Parameter	Type	Description
seatIndex	int	The number of the seat to take
callback	ActionCallback	Callback for the operation

Calling this API will immediately modify the seat list. In cases where listeners need the room owner’s consent to speak, you can call sendInvitation first to send a request and, after receiving onInvitationAccept, call enterSeat.

leaveSeat

This API is used to become a listener (called by speaker).

Note：

After a speaker becomes a listener, all members in the room will receive an onSeatListChange notification and an onAnchorLeaveSeat notification.

- (void)leaveSeat:(ActionCallback _Nullable)callback NS_SWIFT_NAME(leaveSeat(callback:));

The parameters are as detailed below:

Parameter	Type	Description
callback	ActionCallback	Callback for the operation

pickSeat

This API is used to place a user in a seat (called by room owner).

Note：

After the room owner places a user in a seat, all members in the room will receive an onSeatListChange notification and an onAnchorEnterSeat notification.

- (void)pickSeat:(NSInteger)seatIndex userId:(NSString *)userId callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(pickSeat(seatIndex:userId:callback:));

The parameters are as detailed below:

Parameter	Type	Description
seatIndex	int	The number of the seat to place the listener in
userId	String	User ID
callback	ActionCallback	Callback for the operation

Calling this API will immediately modify the seat list. In cases where the room owner needs listeners’ consent to make them speakers, you can call sendInvitation first to send a request and, after receiving onInvitationAccept, call pickSeat.

kickSeat

This API is used to remove a speaker (called by room owner).

Note：

After a speaker is removed, all members in the room will receive an onSeatListChange notification and an onAnchorLeaveSeat notification.

- (void)kickSeat:(NSInteger)seatIndex callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(kickSeat(seatIndex:callback:));

The parameters are as detailed below:

Parameter	Type	Description
seatIndex	int	The number of the seat to remove the speaker from
callback	ActionCallback	Callback for the operation

Calling this API will immediately modify the seat list.

muteSeat

This API is used to mute/unmute a seat (called by room owner).

Note：

After a seat is muted/unmuted, all members in the room will receive an onSeatListChange notification and an onSeatMute notification.

- (void)muteSeat:(NSInteger)seatIndex isMute:(BOOL)isMute callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(muteSeat(seatIndex:isMute:callback:));

The parameters are as detailed below:

Parameter	Type	Description
seatIndex	int	The number of the seat to mute/unmute
isMute	boolean	true: mute; false: unmute
callback	ActionCallback	Callback for the operation

Calling this API will immediately modify the seat list. The speaker on the seat specified by seatIndex will call muteAudio to mute/unmute his or her audio.

closeSeat

This API is used to block/unblock a seat (called by room owner).

Note：

After a seat is blocked/unblocked, all members in the room will receive an onSeatListChange notification and an onSeatClose notification.

- (void)closeSeat:(NSInteger)seatIndex isClose:(BOOL)isClose callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(closeSeat(seatIndex:isClose:callback:));

The parameters are as detailed below:

Parameter	Type	Description
seatIndex	int	The number of the seat to block/unblock
isClose	boolean	true: block; false: unblock
callback	ActionCallback	Callback for the operation

Calling this API will immediately modify the seat list. The speaker on the seat specified by seatIndex will leave the seat.

Local Audio APIs

startMicrophone

This API is used to start mic capturing.

- (void)startMicrophone;

stopMicrophone

This API is used to stop mic capturing.

- (void)stopMicrophone;

setAudioQuality

This API is used to set audio quality.

- (void)setAuidoQuality:(NSInteger)quality NS_SWIFT_NAME(setAuidoQuality(quality:));

The parameters are as detailed below:

Parameter	Type	Description
quality	int	Audio quality. For more information, please see setAudioQuality().

muteLocalAudio

This API is used to mute/unmute local audio.

- (void)muteLocalAudio:(BOOL)mute NS_SWIFT_NAME(muteLocalAudio(mute:));

The parameters are as detailed below:

Parameter	Type	Description
mute	boolean	Whether to mute or unmute audio. For more information, please see muteLocalAudio().

setSpeaker

This API is used to set whether to use the speaker or receiver.

- (void)setSpeaker:(BOOL)userSpeaker NS_SWIFT_NAME(setSpeaker(userSpeaker:));

The parameters are as detailed below:

Parameter	Type	Description
useSpeaker	boolean	true: speaker; false: receiver

setAudioCaptureVolume

This API is used to set the mic capturing volume.

- (void)setAudioCaptureVolume:(NSInteger)voluem NS_SWIFT_NAME(setAudioCaptureVolume(volume:));

The parameters are as detailed below:

Parameter	Type	Description
volume	int	Capturing volume. Value range: 0-100 (default: 100)

setAudioPlayoutVolume

This API is used to set the playback volume.

- (void)setAudioPlayoutVolume:(NSInteger)volume NS_SWIFT_NAME(setAudioPlayoutVolume(volume:));

The parameters are as detailed below:

Parameter	Type	Description
volume	int	Playback volume. Value range: 0-100 (default: 100)

muteRemoteAudio

This API is used to mute/unmute a specified user.

- (void)muteRemoteAudio:(NSString *)userId mute:(BOOL)mute NS_SWIFT_NAME(muteRemoteAudio(userId:mute:));

The parameters are as detailed below:

Parameter	Type	Description
userId	String	User ID
mute	boolean	true: mute; false: unmute

muteAllRemoteAudio

This API is used to mute/unmute all users.

- (void)muteAllRemoteAudio:(BOOL)isMute NS_SWIFT_NAME(muteAllRemoteAudio(isMute:));

The parameters are as detailed below:

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

setVoiceEarMonitorEnable

This API is used to enable/disable in-ear monitoring.

- (void)setVoiceEarMonitorEnable:(BOOL)enable NS_SWIFT_NAME(setVoiceEarMonitor(enable:));

The parameters are as detailed below:

Parameter	Type	Description
enable	boolean	true: enable; false: disable

Background Music and Audio Effect APIs

getAudioEffectManager

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

- (TXAudioEffectManager * _Nullable)getAudioEffectManager;

Message Sending APIs

sendRoomTextMsg

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

- (void)sendRoomTextMsg:(NSString *)message callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(sendRoomTextMsg(message:callback:));

The parameters are as detailed below:

Parameter	Type	Description
message	String	Text message
callback	ActionCallback	Callback for the operation

sendRoomCustomMsg

This API is used to send a custom text message.

- (void)sendRoomCustomMsg:(NSString *)cmd message:(NSString *)message callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(sendRoomCustomMsg(cmd:message:callback:));

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
callback	ActionCallback	Callback for the operation

Invitation Signaling APIs

sendInvitation

This API is used to send an invitation.

- (NSString *)sendInvitation:(NSString *)cmd
                    userId:(NSString *)userId
                   content:(NSString *)content
                  callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(sendInvitation(cmd:userId:content:callback:));

The parameters are as detailed below:

Parameter	Type	Description
cmd	String	Custom command of business
userId	String	Invitee’s user ID
content	String	Invitation content
callback	ActionCallback	Callback for the operation

Response parameters:

Returned Value	Type	Description
inviteId	String	Invitation ID

acceptInvitation

This API is used to accept an invitation.

- (void)acceptInvitation:(NSString *)identifier callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(acceptInvitation(identifier:callback:));

The parameters are as detailed below:

Parameter	Type	Description
id	String	Invitation ID
callback	ActionCallback	Callback for the operation

rejectInvitation

This API is used to decline an invitation.

- (void)rejectInvitation:(NSString *)identifier callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(rejectInvitation(identifier:callback:));

The parameters are as detailed below:

Parameter	Type	Description
id	String	Invitation ID
callback	ActionCallback	Callback for the operation

cancelInvitation

This API is used to cancel an invitation.

- (void)cancelInvitation:(NSString *)identifier callback:(ActionCallback _Nullable)callback NS_SWIFT_NAME(cancelInvitation(identifier:callback:));

The parameters are as detailed below:

Parameter	Type	Description
id	String	Invitation ID
callback	ActionCallback	Callback for the operation

TRTCChorusDelegate 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.

- (void)onError:(int)code
              message:(NSString*)message
NS_SWIFT_NAME(onError(code:message:));

The parameters are as detailed below:

Parameter	Type	Description
code	int	Error code
message	String	Error message

onWarning

Callback for warning.

- (void)onWarning:(int)code
                message:(NSString *)message
NS_SWIFT_NAME(onWarning(code:message:));

The parameters are as detailed below:

Parameter	Type	Description
code	int	Error code
message	String	Warning message

onDebugLog

Callback for log.

- (void)onDebugLog:(NSString *)message
NS_SWIFT_NAME(onDebugLog(message:));

The parameters are as detailed below:

Parameter	Type	Description
message	String	Log information

Room Event Callback APIs

onRoomDestroy

Callback for room termination. When the owner terminates the room, all users in the room will receive this callback.

- (void)onRoomDestroy:(NSString *)message
NS_SWIFT_NAME(onRoomDestroy(message:));

The parameters are as detailed below:

Parameter	Type	Description
roomId	String	Room ID

onRoomInfoChange

Callback for change of room information. This callback is sent after successful room entry. The information in roomInfo is passed in by the room owner during room creation.

- (void)onRoomInfoChange:(ChorusInfo *)roomInfo
NS_SWIFT_NAME(onRoomInfoChange(roomInfo:));

The parameters are as detailed below:

Parameter	Type	Description
roomInfo	RoomInfo	Room information

onUserVolumeUpdate

Callback of the volume of each member in the room after the volume reminder is enabled.

- (void)onUserVolumeUpdate:(NSArray<TRTCVolumeInfo *> *)userVolumes totalVolume:(NSInteger)totalVolume
NS_SWIFT_NAME(onUserVolumeUpdate(userVolumes:totalVolume:));

The parameters are as detailed below:

Parameter	Type	Description
userVolumes	List	List of user volumes
totalVolume	int	Total volume. Value range: 0-100

Seat Callback APIs

onSeatListChange

Callback for all seat changes.

- (void)onSeatInfoChange:(NSArray<ChorusSeatInfo *> *)seatInfolist
NS_SWIFT_NAME(onSeatListChange(seatInfoList:));

The parameters are as detailed below:

Parameter	Type	Description
seatInfoList	List<SeatInfo>	Full seat list

onAnchorEnterSeat

Someone became a speaker or was made a speaker by the owner.

- (void)onAnchorEnterSeat:(NSInteger)index
                            user:(ChorusUserInfo *)user
NS_SWIFT_NAME(onAnchorEnterSeat(index:user:));

The parameters are as detailed below:

Parameter	Type	Description
index	int	The seat taken
user	UserInfo	Details of the user who took the seat

onAnchorLeaveSeat

A speaker became a listener or was moved to listeners by the room owner.

- (void)onAnchorLeaveSeat:(NSInteger)index
                   user:(ChorusUserInfo *)user
NS_SWIFT_NAME(onAnchorLeaveSeat(index:user:));

The parameters are as detailed below:

Parameter	Type	Description
index	int	The seat previously occupied by the speaker
user	UserInfo	Details of the user who took the seat

onSeatMute

The room owner muted/unmuted a seat.

- (void)onSeatMute:(NSInteger)index
          isMute:(BOOL)isMute
NS_SWIFT_NAME(onSeatMute(index:isMute:));

The parameters are as detailed below:

Parameter	Type	Description
index	int	The seat muted/unmuted
isMute	boolean	true: muted; false: unmuted

onSeatClose

The room owner blocked/unblocked a seat.

- (void)onSeatClose:(NSInteger)index
          isClose:(BOOL)isClose
NS_SWIFT_NAME(onSeatClose(index:isClose:));

The parameters are as detailed below:

Parameter	Type	Description
index	int	The seat blocked/unblocked
isClose	boolean	true: blocked; false: unblocked

Callback APIs for Room Entry/Exit by Listener

onAudienceEnter

A listener entered the room.

- (void)onAudienceEnter:(ChorusUserInfo *)userInfo
NS_SWIFT_NAME(onAudienceEnter(userInfo:));

The parameters are as detailed below:

Parameter	Type	Description
userInfo	UserInfo	Information of the listener who entered the room

onAudienceExit

A listener exited the room.

- (void)onAudienceExit:(ChorusUserInfo *)userInfo
NS_SWIFT_NAME(onAudienceExit(userInfo:));

The parameters are as detailed below:

Parameter	Type	Description
userInfo	UserInfo	Information of the listener who exited the room

Message Event Callback APIs

onRecvRoomTextMsg

A text message was received.

- (void)onRecvRoomTextMsg:(NSString *)message
               userInfo:(ChorusUserInfo *)userInfo
NS_SWIFT_NAME(onRecvRoomTextMsg(message:userInfo:));

The parameters are as detailed below:

Parameter	Type	Description
message	String	Text message
userInfo	UserInfo	Information of the sender

onRecvRoomCustomMsg

A custom message was received.

- (void)onRecvRoomCustomMsg:(NSString *)cmd
                  message:(NSString *)message
                 userInfo:(ChorusUserInfo *)userInfo
NS_SWIFT_NAME(onRecvRoomCustomMsg(cmd:message:userInfo:));

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
userInfo	UserInfo	Information of the sender

Invitation Signaling Callback APIs

onReceiveNewInvitation

An invitation was received.

- (void)onReceiveNewInvitation:(NSString *)identifier
                     inviter:(NSString *)inviter
                         cmd:(NSString *)cmd
                     content:(NSString *)content
NS_SWIFT_NAME(onReceiveNewInvitation(identifier:inviter:cmd:content:));

The parameters are as detailed below:

Parameter	Type	Description
id	String	Invitation ID
inviter	String	Inviter’s user ID
cmd	String	Custom command word specified by business
content	UserInfo	Content specified by business

onInviteeAccepted

The invitee accepted the invitation

- (void)onInviteeAccepted:(NSString *)identifier
                invitee:(NSString *)invitee
NS_SWIFT_NAME(onInviteeAccepted(identifier:invitee:));

The parameters are as detailed below:

Parameter	Type	Description
id	String	Invitation ID
invitee	String	Invitee’s user ID

onInviteeRejected

The invitee declined the invitation

- (void)onInviteeRejected:(NSString *)identifier
                invitee:(NSString *)invitee
NS_SWIFT_NAME(onInviteeRejected(identifier:invitee:));

The parameters are as detailed below:

Parameter	Type	Description
id	String	Invitation ID
invitee	String	Invitee’s user ID

onInvitationCancelled

The inviter canceled the invitation.

- (void)onInvitationCancelled:(NSString *)identifier
                    invitee:(NSString *)invitee NS_SWIFT_NAME(onInvitationCancelled(identifier:invitee:));

The parameters are as detailed below:

Parameter	Type	Description
id	String	Invitation ID
inviter	String	Inviter’s user ID

Music Playback Status Callback APIs

onMusicPrepareToPlay

Music playback is ready.

- (void)onMusicPrepareToPlay:(int32_t)musicID
NS_SWIFT_NAME(onMusicPrepareToPlay(musicID:));

The parameters are as detailed below:

Parameter	Type	Description
musicID	int32_t	musicID passed in for playback

onMusicProgressUpdate

Music playback progress.

- (void)onMusicProgressUpdate:(int32_t)musicID
                   progress:(NSInteger)progress total:(NSInteger)total
NS_SWIFT_NAME(onMusicProgressUpdate(musicID:progress:total:));

The parameters are as detailed below:

Parameter	Type	Description
musicID	int32_t	musicID passed in for playback
progress	NSInteger	Current playback progress in ms
total	NSInteger	Total duration in ms

onMusicCompletePlaying

Music playback was completed.

- (void)onMusicCompletePlaying:(int32_t)musicID
NS_SWIFT_NAME(onMusicCompletePlaying(musicID:));

The parameters are as detailed below:

Parameter	Type	Description
musicID	int32_t	musicID passed in for playback

onReceiveAnchorSendChorusMsg

The room owner sent a duet message.

- (void)onReceiveAnchorSendChorusMsg:(NSString *)musicId startDelay:(NSInteger)startDelay
NS_SWIFT_NAME(onReceiveAnchorSendChorusMsg(musicId:startDelay:));

The parameters are as detailed below:

Parameter	Type	Description
musicId	NSString	musicID of the song to sing
startDelay	NSInteger	Time (s) to wait before the song is played