tencent cloud

// Create TRTCCloud main instance (vocal instance)
TRTCCloud *trtcCloud = [TRTCCloud sharedInstance];
// Create TRTCCloud sub-instance (accompaniment instance)
TRTCCloud *subCloud = [trtcCloud createSubCloud];

TRTCParams *params = [[TRTCParams alloc] init];
params.sdkAppId = sdkAppId;
params.userId = userId;
params.userSig = userSign;
params.role = TRTCRoleAnchor;
params.roomId = roomIdIntValue;
[trtcCloud enterRoom:params appScene:TRTCAppSceneLIVE];
// Turn on audio uplink and set audio quality
[trtcCloud startLocalAudio:TRTCAudioQualityMusic];
// Set media type
[trtcCloud setSystemVolumeType:TRTCSystemVolumeTypeMedia];
// Mute remote accompaniment music
[trtcCloud muteRemoteAudio:remoteAudioId mute:YES];

TRTCParams *bgmParams = [[TRTCParams alloc] init];
bgmParams.sdkAppId = sdkAppId;
bgmParams.userId = [NSString stringWithFormat:@"%@%@",userId,@"_bgm"];
bgmParams.userSig = bgmUserSign;
bgmParams.role = TRTCRoleAnchor;
bgmParams.roomId = roomIdIntValue;
[subCloud enterRoom:bgmParams appScene:TRTCAppSceneLIVE];
// Set media type
[subCloud setSystemVolumeType:TRTCSystemVolumeTypeMedia];
// Enable preloading
NSDictionary *jsonDict = @{
                              @"api": @"preloadMusic",
                              @"params": @{
                                            @"musicId": @(self.currentPlayMusicID),
                                            @"path": path,
                                            @"startTimeMS": @(startMs),
                                           }
                             };
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDict options:0 error:NULL];
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
[subCloud callExperimentalAPI:jsonString];
// Play accompaniment music and push the stream (play at the agreed time)
TXAudioMusicParam *musicParam = [[TXAudioMusicParam alloc] init];
musicParam.ID = musicID;
musicParam.path = url;
musicParam.loopCount = 0;
musicParam.publish = YES;
// Send accompaniment music to the remote end
param.publish = YES;
[[subCloud getAudioEffectManager] startPlayMusic:musicParam onStart:startBlock onProgress:progressBlock onComplete:completedBlock]

// Create a TRTCPublishTarget object
TRTCPublishTarget *publishTarget = [[TRTCPublishTarget alloc] init];
// Push back to the room after mixing, if publishing to CDN, fill in TRTCPublishMixStreamToCdn
publishTarget.mode = TRTCPublishMixStreamToRoom;
// The userid of the mixing robot, which cannot be duplicated with other users' userid in the room
publishTarget.mixStreamIdentity = [NSString stringWithFormat:@"%@%@",userId,@"_mix"];
 
// Set the encoding parameters of the transcoded audio stream
TRTCStreamEncoderParam *streamEncoderParam = [[TRTCStreamEncoderParam alloc] init];
streamEncoderParam.videoEncodedFPS = 15;
streamEncoderParam.videoEncodedGOP = 3;
streamEncoderParam.videoEncodedKbps = 30;
streamEncoderParam.audioEncodedSampleRate = 48000;
streamEncoderParam.audioEncodedChannelNum = 2;
streamEncoderParam.audioEncodedKbps = 64;
streamEncoderParam.audioEncodedCodecType = 2;

// Set audio mixing parameters
TRTCStreamMixingConfig *streamMixingConfig = [[TRTCStreamMixingConfig alloc] init];
// Support filling in empty values, which will automatically mix the audio of all hosts and output
streamMixingConfig.audioMixUserList = @[];

// Initiate mixed stream transcoding and pushing request
[trtcCloud startPublishMediaStream:publishTarget encoderParam:streamEncoderParam mixingConfig:streamMixingConfig];