tencent cloud

// 创建 TRTCCloud 主实例（人声实例）
TRTCCloud *trtcCloud = [TRTCCloud sharedInstance];
// 创建 TRTCCloud 子实例（伴奏实例）
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];
// 打开音频上行，设置音质
[trtcCloud startLocalAudio:TRTCAudioQualityMusic];
// 设置媒体类型
[trtcCloud setSystemVolumeType:TRTCSystemVolumeTypeMedia];
// 静音远端伴奏音乐
[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];
//设置媒体类型
[subCloud setSystemVolumeType:TRTCSystemVolumeTypeMedia];
// 开启预加载
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];
// 播放伴奏音乐并推流（在约定时间播放）
TXAudioMusicParam *musicParam = [[TXAudioMusicParam alloc] init];
musicParam.ID = musicID;
musicParam.path = url;
musicParam.loopCount = 0;
musicParam.publish = YES;
// 将伴奏音乐传到远端
param.publish = YES;
[[subCloud getAudioEffectManager] startPlayMusic:musicParam onStart:startBlock onProgress:progressBlock onComplete:completedBlock]

// 创建 TRTCPublishTarget 对象
TRTCPublishTarget *publishTarget = [[TRTCPublishTarget alloc] init];
// 混流后回推到房间，若发布到 CDN 应填 TRTCPublishMixStreamToCdn
publishTarget.mode = TRTCPublishMixStreamToRoom;
// 混流机器人的 userid，不能和房间内其他用户的 userid 重复
publishTarget.mixStreamIdentity = [NSString stringWithFormat:@"%@%@",userId,@"_mix"];
 
// 设置转码后的音频流的编码参数
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;

// 设置音频混流参数
TRTCStreamMixingConfig *streamMixingConfig = [[TRTCStreamMixingConfig alloc] init];
// 支持填写空值，会自动将所有主播的音频混合输出
streamMixingConfig.audioMixUserList = @[];

// 发起混流转推请求
[trtcCloud startPublishMediaStream:publishTarget encoderParam:streamEncoderParam mixingConfig:streamMixingConfig];