本章节介绍 iOS 端互动直播场景核心功能的实现方式。

前提条件

• 已完成视频直播服务开通和基础配置，请参见视频直播快速入门。

• 已完成直播推流 SDK 和拉流 SDK集成和 SDK 初始化。

• 已完成实时音视频服务开通，请参见实时音视频开通服务。

版本说明

互动直播功能需要使用互动版 SDK，请您在安装 SDK 时选择正确的版本。

最新互动版 SDK 适配 RTC Native SDK 3.52，请参考 RTC Native SDK API 查看对应版本 SDK API 说明。

主播端核心功能实现

以下是主播端核心功能实现的时序图和参考接入代码。

主播开播

主播通过 RTC 引擎和推流引擎开始直播推流。
时序图

示例代码

• 创建 RTC 视频引擎，设置本地预览视图，设置视频编码参数。

// 初始化 ByteRTCVideo 对象
self.rtcVideo = [ByteRTCVideo createRTCVideo:self.appId delegate:self parameters:@{}];

// 设置本地预览视图
ByteRTCVideoCanvas *canvasView = [[ByteRTCVideoCanvas alloc] init];
canvasView.view = view;
canvasView.renderMode = ByteRTCRenderModeHidden;
[self.rtcVideo setLocalVideoCanvas:ByteRTCStreamIndexMain withCanvas:canvasView];

// 设置视频编码参数
ByteRTCVideoEncoderConfig *solution = [[ByteRTCVideoEncoderConfig alloc] init];
solution.width = self.config.captureWidth;
solution.height = self.config.captureHeight;
solution.frameRate = self.config.captureFps;
solution.maxBitrate = self.config.videoEncoderKBitrate;
[self.rtcVideo setMaxVideoEncoderConfig:solution];    

• 订阅 RTC 本地音视频数据。

// 订阅本地视频数据
[self.rtcVideo setLocalVideoSink:ByteRTCStreamIndexMain
                        withSink:self
                 withPixelFormat:(ByteRTCVideoSinkPixelFormatBGRA)];

// 订阅本地音频数据
ByteRTCAudioFormat *audioFormat = [[ByteRTCAudioFormat alloc] init];
audioFormat.channel = ByteRTCAudioChannelStereo;
audioFormat.sampleRate = ByteRTCAudioSampleRate44100;
[self.rtcVideo enableAudioFrameCallback:(ByteRTCAudioFrameCallbackRecord) format:audioFormat];
[self.rtcVideo registerAudioFrameObserver:self];

• 创建推流引擎，设置推流视频编码参数。

// 创建推流引擎
self.livePusher = [[VeLivePusher alloc] initWithConfig:[[VeLivePusherConfiguration alloc] init]];

// 配置推流参数
// 视频编码配置
VeLiveVideoEncoderConfiguration *videoEncodeCfg = [[VeLiveVideoEncoderConfiguratio
// 视频编码初始化码率
videoEncodeCfg.bitrate = self.config.videoEncoderKBitrate;
// 视频编码最小码率
videoEncodeCfg.minBitrate = self.config.videoEncoderKBitrate;
// 视频编码最大码率
videoEncodeCfg.maxBitrate = self.config.videoEncoderKBitrate;
// 配置帧率
videoEncodeCfg.fps = self.config.videoEncoderFps;
// 配置编码
[self.livePusher setVideoEncoderConfiguration:videoEncodeCfg];
        
// 开启外部视频采集
[self.livePusher startVideoCapture:(VeLiveVideoCaptureExternal)];
// 开启外部音频采集
[self.livePusher startAudioCapture:(VeLiveAudioCaptureExternal)];

• 开启 RTC 音视频采集。

// 开始视频采集
[self.rtcVideo startVideoCapture];

// 开始音频采集
[self.rtcVideo startAudioCapture];

• 开启推流引擎推流。

// 开始推流
[self.livePusher startPush:url];

• RTC 本地音视频回调数据发送给推流引擎。

// 视频采集回调， 发送视频数据给推流引擎
- (void)renderPixelBuffer:(CVPixelBufferRef)pixelBuffer
                 rotation:(ByteRTCVideoRotation)rotation
              contentType:(ByteRTCVideoContentType)contentType
             extendedData:(NSData *)extendedData {
    CMTime pts = CMTimeMakeWithSeconds(CACurrentMediaTime(), 1000000000);
    VeLiveVideoFrame *videoFrame = [[VeLiveVideoFrame alloc] init];
    videoFrame.pts = pts;
    videoFrame.pixelBuffer = pixelBuffer;
    VeLiveVideoRotation videoRotation = VeLiveVideoRotation0;
    switch (rotation) {
        case ByteRTCVideoRotation0:
            videoRotation = VeLiveVideoRotation0;
            break;
        case ByteRTCVideoRotation90:
            videoRotation = VeLiveVideoRotation90;
            break;
        case ByteRTCVideoRotation180:
            videoRotation = VeLiveVideoRotation180;
            break;
        case ByteRTCVideoRotation270:
            videoRotation = VeLiveVideoRotation270;
            break;
            
        default:
            break;
    }
    videoFrame.rotation = videoRotation;
    videoFrame.bufferType = VeLiveVideoBufferTypePixelBuffer;
    [self.livePusher pushExternalVideoFrame:videoFrame];
}

// 音频采集回调， 发送音频数据给推流引擎
- (void)onRecordAudioFrame:(ByteRTCAudioFrame * _Nonnull)audioFrame {
    int channel = 2;
    if (audioFrame.channel == ByteRTCAudioChannelMono) {
        channel = 1;
    } else if (audioFrame.channel == ByteRTCAudioChannelStereo) {
        channel = 2;
    }
    
    CMTime pts = CMTimeMakeWithSeconds(CACurrentMediaTime(), 1000000000);
    
    VeLiveAudioFrame *frame = [[VeLiveAudioFrame alloc] init];
    frame.bufferType = VeLiveAudioBufferTypeNSData;
    frame.data = audioFrame.buffer;
    frame.pts = pts;
    frame.channels = (VeLiveAudioChannel)channel;
    frame.sampleRate = VeLiveAudioSampleRate44100;
    
    [self.livePusher pushExternalAudioFrame:frame];
}

主播美颜（可选）

主播美颜功能都是通过 RTC 引擎进行对接，使用方式请参考 美颜特效（CV）。

主播上麦

主播停止推流引擎推流，通过 RTC 引擎加入房间连麦，并开启 RTC 服务端合流转推。

时序图

代码示例

• 停止推流引擎推流。

// 停止推流引擎推流
[self.livePusher stopPush];

• 创建 RTC 房间，设置用户信息，加入 RTC 房间。参考使用 Token 完成鉴权了解如何通过业务服务器获取鉴权 token。

// 创建 RTC 房间
self.rtcRoom = [self.rtcVideo createRTCRoom:self.roomId];
self.rtcRoom.delegate = self;

 // 设置用户信息
ByteRTCUserInfo *userInfo = [[ByteRTCUserInfo alloc] init];
userInfo.userId = self.userId;

ByteRTCRoomConfig *config = [ByteRTCRoomConfig new];
config.isAutoPublish = YES;
config.isAutoSubscribeAudio = YES;
config.isAutoSubscribeVideo = YES;

// 加入房间，token 信息通过业务服务器申请
[self.rtcRoom joinRoom:token userInfo:userInfo roomConfig:config];

• 收到加入 RTC 房间成功回调，开启 RTC 服务端合流转推。

// 加入房间成功通知
- (void)rtcRoom:(ByteRTCRoom *_Nonnull)rtcRoom
   onRoomStateChanged:(NSString *_Nonnull)roomId
            withUid:(nonnull NSString *)uid
          state:(NSInteger)state
      extraInfo:(NSString *_Nonnull)extraInfo {
      
      // 创建 RTC 服务端合流配置
      self.mixStreamConfig = [ByteRTCMixedStreamConfig defaultMixedStreamConfig];
      self.mixStreamConfig.roomID = self.roomId;
      self.mixStreamConfig.userID = self.userId;
        
      // 设置视频编码参数。该参数需要和推流视频编码参数保持一致
      self.mixStreamConfig.videoConfig.width = self.config.videoEncoderWith;
      self.mixStreamConfig.videoConfig.height = self.config.videoEncoderHeight;
      self.mixStreamConfig.videoConfig.fps = self.config.videoEncoderFps;
      self.mixStreamConfig.videoConfig.bitrate = self.config.videoEncoderKBitrate;
        
      // 设置音频编码参数。该参数需要和推流音频编码参数保持一致
      self.mixStreamConfig.audioConfig = [[ByteRTCMixedStreamAudioConfig alloc] init];
      self.mixStreamConfig.audioConfig.sampleRate = self.config.audioEncoderSampleRate;
      self.mixStreamConfig.audioConfig.channels = self.config.audioEncoderChannel;
      self.mixStreamConfig.audioConfig.bitrate = self.config.audioEncoderKBitrate;
      
      // 设置推流地址， 这里为主播的 RTMP 推流地址
      self.mixStreamConfig.pushURL = self.streamUrl;
      
      // 服务端合流
      self.mixStreamConfig.expectedMixingType = ByteRTCMixedStreamByServer;
        
      // 初始化布局
      ByteRTCMixedStreamLayoutConfig * layout = [[ByteRTCMixedStreamLayoutConfig alloc]init];
      
      // 设置背景色
      layout.backgroundColor = @"#000000"; //仅供参考
      
      NSMutableArray *regions = [[NSMutableArray alloc]initWithCapacity:6];
      
      // 主播合流布局
      ByteRTCMixedStreamLayoutRegionConfig *region = [[ByteRTCMixedStreamLayoutRegionConfig alloc]init];
      region.userID          = self.userId; // 主播uid
      region.roomID       = self.roomId;
      region.isLocalUser    = YES;
      region.renderMode   = ByteRTCMixedStreamRenderModeHidden;
      region.locationX        = 0.0; //仅供参考
      region.locationY        = 0.0; //仅供参考
      region.widthProportion    = 0.5; //仅供参考
      region.heightProportion   = 0.5; //仅供参考
      region.zOrder   = 0;   //仅供参考
      region.alpha    = 1.0; //仅供参考
      [regions addObject:region];
      layout.regions = regions;
      
      // 设置合流模版
      self.mixStreamConfig.layoutConfig = layout;
        
      // 设置合流任务Id
      self.rtcTaskId = @"";
      
      // 开启 RTC 服务端合流转推
      [self.rtcVideo startPushMixedStreamToCDN:self.rtcTaskId mixedConfig:self.mixStreamConfig observer:self];

}

• 收到房间内连麦用户的音视频流发布通知后，调整用户视图以及合流布局。

- (void)rtcRoom:(ByteRTCRoom *)rtcRoom onUserPublishStream:(NSString *)userId type:(ByteRTCMediaStreamType)type {

     if (streamType == ByteRTCMediaStreamTypeVideo || streamType == ByteRTCMediaStreamTypeBoth) {
          // 设置连麦用户视图
          ByteRTCVideoCanvas *canvas = [[ByteRTCVideoCanvas alloc] init];
          canvas.renderMode = ByteRTCRenderModeHidden;
          canvas.view.backgroundColor = [UIColor clearColor];
          canvas.view = view;
        
          ByteRTCRemoteStreamKey *streamKey = [[ByteRTCRemoteStreamKey alloc] init];
          streamKey.userId = uid;
          streamKey.streamIndex = ByteRTCStreamIndexMain;
          streamKey.roomId = self.roomId;
          [self.rtcVideo setRemoteVideoCanvas:streamKey withCanvas:canvas];
     }
     // 更新合流模版
     NSMutableArray *regions = [[NSMutableArray alloc]initWithCapacity:6];
      
      // 主播合流布局
      ByteRTCMixedStreamLayoutRegionConfig *region = [[ByteRTCMixedStreamLayoutRegionConfig alloc]init];
      region.userID          = self.userId; // 主播uid
      region.roomID       = self.roomId;
      region.isLocalUser    = YES;
      region.renderMode   = ByteRTCMixedStreamRenderModeHidden;
      region.locationX        = 0.0; //仅供参考
      region.locationY        = 0.0; //仅供参考
      region.widthProportion    = 0.5; //仅供参考
      region.heightProportion   = 0.5; //仅供参考
      region.zOrder   = 0;   //仅供参考
      region.alpha    = 1.0; //仅供参考
      [regions addObject:region];
      
      // 连麦用户合流布局
      ByteRTCVideoCompositingRegion *regionRemote = [[ByteRTCVideoCompositingRegion alloc]init];
      regionRemote.userID          = userId; // 连麦uid
      regionRemote.roomID       = self.roomId;
      regionRemote.isLocalUser    = NO;
      regionRemote.renderMode   = ByteRTCMixedStreamRenderModeHidden;
      regionRemote.locationX        = 0.5; //仅供参考
      regionRemote.locationY        = 0.0; //仅供参考
      regionRemote.widthProportion    = 0.5; //仅供参考
      regionRemote.heightProportion   = 0.5; //仅供参考
      regionRemote.zOrder   = 1;   //仅供参考
      regionRemote.alpha    = 1.0; //仅供参考
      [regions addObject:regionRemote];
      
      layout.regions = regions;
      
      // 更新合流
      self.mixStreamConfig.layoutConfig = layout;
      [self.rtcVideo updatePushMixedStreamToCDN:self.rtcTaskId mixedConfig:self.mixStreamConfig];
    
}

- (void)manager:(VeLiveAnchorManager *)manager onUserUnPublishStream:(NSString *)uid type:(ByteRTCMediaStreamType)streamType reason:(ByteRTCStreamRemoveReason)reason {

     if (streamType == ByteRTCMediaStreamTypeVideo || streamType == ByteRTCMediaStreamTypeBoth) {
          // 设置连麦用户视图
          ByteRTCVideoCanvas *canvas = [[ByteRTCVideoCanvas alloc] init];
          canvas.renderMode = ByteRTCRenderModeHidden;
          canvas.view.backgroundColor = [UIColor clearColor];
          canvas.view = nil;
        
          ByteRTCRemoteStreamKey *streamKey = [[ByteRTCRemoteStreamKey alloc] init];
          streamKey.userId = uid;
          streamKey.streamIndex = ByteRTCStreamIndexMain;
          streamKey.roomId = self.roomId;
          [self.rtcVideo setRemoteVideoCanvas:streamKey withCanvas:canvas];
     }
      
     // 更新合流模版
     NSMutableArray *regions = [[NSMutableArray alloc]initWithCapacity:6];
      
      // 只保留主播合流布局
      ByteRTCMixedStreamLayoutRegionConfig *region = [[ByteRTCMixedStreamLayoutRegionConfig alloc]init];
      region.userID          = self.userId; // 主播uid
      region.roomID       = self.roomId;
      region.isLocalUser    = YES;
      region.renderMode   = ByteRTCMixedStreamRenderModeHidden;
      region.locationX        = 0.0; //仅供参考
      region.locationY        = 0.0; //仅供参考
      region.widthProportion    = 0.5; //仅供参考
      region.heightProportion   = 0.5; //仅供参考
      region.zOrder   = 0;   //仅供参考
      region.alpha    = 1.0; //仅供参考
      [regions addObject:region];
      
      layout.regions = regions;
      
      // 更新合流
      self.mixStreamConfig.layoutConfig = layout;
      [self.rtcVideo updatePushMixedStreamToCDN:self.rtcTaskId mixedConfig:self.mixStreamConfig];
    
}

主播下麦

主播停止 RTC 服务端合流转推，离开 RTC 房间，开启推流引擎推流。

时序图

示例代码

• 停止 RTC 服务端合流，离开房间，移除连麦用户视图。

// 停止 RTC 服务端合流转推
[self.rtcVideo stopPushStreamToCDN:self.rtcTaskId];

// 离开 RTC 房间
[self.rtcRoom leaveRoom];

// 移除连麦用户视图
ByteRTCVideoCanvas *canvas = [[ByteRTCVideoCanvas alloc] init];
canvas.renderMode = ByteRTCRenderModeHidden;
canvas.view.backgroundColor = [UIColor clearColor];
canvas.view = nil;

ByteRTCRemoteStreamKey *streamKey = [[ByteRTCRemoteStreamKey alloc] init];
streamKey.userId = uid;
streamKey.streamIndex = ByteRTCStreamIndexMain;
streamKey.roomId = self.roomId;
[self.rtcVideo setRemoteVideoCanvas:streamKey withCanvas:canvas];

• 开启推流引擎推流。

// 开始推流引擎推流
[self.livePusher startPush:url];

主播停播

主播停止直播，销毁 RTC 引擎和推流引擎。

时序图

代码示例

• 停止推流引擎推流，销毁推流引擎。

// 停止推流引擎推流
[self.livePusher stopPush];

// 销毁推流引擎
[self.livePusher destroy];
self.livePusher = nil;

• 停止 RTC 音视频采集，移除本地预览视图。

// 停止 RTC 视频采集
[self.rtcVideo stopVideoCapture];

// 停止 RTC 音频采集
[self.rtcVideo startAudioCapture];

// 移除 RTC 本地预览视图
ByteRTCVideoCanvas *canvasView = [[ByteRTCVideoCanvas alloc] init];
canvasView.view = nil;
canvasView.renderMode = ByteRTCRenderModeHidden;
[self.rtcVideo setLocalVideoCanvas:ByteRTCStreamIndexMain withCanvas:canvasView];

• 销毁 RTC 房间，销毁 RTC 视频引擎。

// 销毁 RTC 房间
[self.rtcRoom destroy];
self.rtcRoom = nil;

// 销毁 RTC 视频引擎
[ByteRTCVideo destroyRTCVideo];
self.rtcVideo = nil;

观众端核心功能实现

以下是观众端核心功能实现的时序图和参考接入代码。

观众拉流

观众端通过播放器拉流观看直播。

时序图

示例代码

• 创建和设置播放器。

// 创建播放器
TVLManager *livePlayer = [[TVLManager alloc] init];
self.livePlayer = livePlayer;

// 设置播放器回调
[self.livePlayer setObserver:self];

// 播放器参数设置
VeLivePlayerConfiguration *config = [[VeLivePlayerConfiguration alloc]init];
config.enableStatisticsCallback = YES;
config.enableLiveDNS = YES;
config.enableSei = YES;
[self.livePlayer setConfig:config];

• 设置播放器视图，设置直播地址，开启拉流播放。

// 设置播放器视图
self.livePlayer.playerView.frame = UIScreen.mainScreen.bounds;
[self.view addSubview:self.livePlayer.playerView];

// 设置播放地址
[self.livePlayer setPlayUrl:LIVE_PULL_URL];

// 开始播放
[self.livePlayer play];

观众上麦

连麦观众停止播放器拉流播放，通过 RTC 引擎进行连麦。

时序图

示例代码

• 停止播放，移除播放器视图。

// 停止播放
[self.livePlayer stop];

// 移除播放器视图
self.livePlayer.playerView.hidden = YES;

• 创建 RTC 视频引擎，设置本地预览视图，设置视频编码参数。

// 初始化 ByteRTCVideo 对象
self.rtcVideo = [ByteRTCVideo createRTCVideo:self.appId delegate:self parameters:@{}];

// 设置本地视图
ByteRTCVideoCanvas *canvasView = [[ByteRTCVideoCanvas alloc] init];
canvasView.view = view;
canvasView.renderMode = ByteRTCRenderModeHidden;
[self.rtcVideo setLocalVideoCanvas:ByteRTCStreamIndexMain withCanvas:canvasView];

// 设置视频编码参数
ByteRTCVideoEncoderConfig *solution = [[ByteRTCVideoEncoderConfig alloc] init];
solution.width = self.config.captureWidth;
solution.height = self.config.captureHeight;
solution.frameRate = self.config.captureFps;
solution.maxBitrate = self.config.videoEncoderKBitrate;
[self.rtcVideo setMaxVideoEncoderConfig:solution];

• 开启 RTC 音视频采集。

// 开始视频采集
[self.rtcVideo startVideoCapture];

// 开始音频采集
[self.rtcVideo startAudioCapture];

• 创建 RTC 房间，设置用户信息，加入 RTC 房间。

// 创建 RTC 房间
self.rtcRoom = [self.rtcVideo createRTCRoom:self.roomId];
self.rtcRoom.delegate = self;

 // 设置用户信息
ByteRTCUserInfo *userInfo = [[ByteRTCUserInfo alloc] init];
userInfo.userId = self.userId;

// 加入房间，开始连麦
ByteRTCRoomConfig *config = [ByteRTCRoomConfig new];
config.isAutoPublish = YES;
config.isAutoSubscribeAudio = YES;
config.isAutoSubscribeVideo = YES;
// token 信息通过业务服务器申请
[self.rtcRoom joinRoom:token userInfo:userInfo roomConfig:config];

• 收到房间内连麦用户的音视频流发布通知后，调整用户视图。

- (void)rtcRoom:(ByteRTCRoom *)rtcRoom onUserPublishStream:(NSString *)userId type:(ByteRTCMediaStreamType)type {

     if (streamType == ByteRTCMediaStreamTypeVideo || streamType == ByteRTCMediaStreamTypeBoth) {
          // 设置连麦用户视图
          ByteRTCVideoCanvas *canvas = [[ByteRTCVideoCanvas alloc] init];
          canvas.renderMode = ByteRTCRenderModeHidden;
          canvas.view.backgroundColor = [UIColor clearColor];
          canvas.view = view;
        
          ByteRTCRemoteStreamKey *streamKey = [[ByteRTCRemoteStreamKey alloc] init];
          streamKey.userId = uid;
          streamKey.streamIndex = ByteRTCStreamIndexMain;
          streamKey.roomId = self.roomId;
          [self.rtcVideo setRemoteVideoCanvas:streamKey withCanvas:canvas];
     }    
}

- (void)manager:(VeLiveAnchorManager *)manager onUserUnPublishStream:(NSString *)uid type:(ByteRTCMediaStreamType)streamType reason:(ByteRTCStreamRemoveReason)reason {

     if (streamType == ByteRTCMediaStreamTypeVideo || streamType == ByteRTCMediaStreamTypeBoth) {
          // 移除连麦用户视图
          ByteRTCVideoCanvas *canvas = [[ByteRTCVideoCanvas alloc] init];
          canvas.renderMode = ByteRTCRenderModeHidden;
          canvas.view.backgroundColor = [UIColor clearColor];
          canvas.view = nil;
        
          ByteRTCRemoteStreamKey *streamKey = [[ByteRTCRemoteStreamKey alloc] init];
          streamKey.userId = uid;
          streamKey.streamIndex = ByteRTCStreamIndexMain;
          streamKey.roomId = self.roomId;
          [self.rtcVideo setRemoteVideoCanvas:streamKey withCanvas:canvas];
     }  
}

观众美颜（可选）

观众连麦美时颜功能都是通过 RTC 引擎进行对接，使用方式请参考 美颜特效（CV）。

观众下麦

观众停止 RTC 引擎连麦，恢复拉流观看直播。

时序图

示例代码

• 离开 RTC 房间，停止 RTC 音视频采集，移除 RTC 本地和远端视图。

// 离开 RTC 房间
[self.rtcRoom leaveRoom];

// 移除本地视图
ByteRTCVideoCanvas *canvasView = [[ByteRTCVideoCanvas alloc] init];
canvasView.view = nil; // 设置为nil
canvasView.renderMode = ByteRTCRenderModeHidden;
[self.rtcVideo setLocalVideoCanvas:ByteRTCStreamIndexMain withCanvas:canvasView];

// 移除连麦用户视图
ByteRTCVideoCanvas *canvas = [[ByteRTCVideoCanvas alloc] init];
canvas.renderMode = ByteRTCRenderModeHidden;
canvas.view.backgroundColor = [UIColor clearColor];
canvas.view = nil;
        
ByteRTCRemoteStreamKey *streamKey = [[ByteRTCRemoteStreamKey alloc] init];
streamKey.userId = uid;
streamKey.streamIndex = ByteRTCStreamIndexMain;
streamKey.roomId = self.roomId;
[self.rtcVideo setRemoteVideoCanvas:streamKey withCanvas:canvas];

// 停止视频采集
[self.rtcVideo stopVideoCapture];

// 停止音频采集
[self.rtcVideo stopAudioCapture];

• 设置播放器视图，启动拉流播放。

// 添加播放器视图
self.livePlayer.playerView.hidden = NO;

// 开始播放
[self.livePlayer play];

观众离开

观众停止观看直播，销毁播放器。

时序图

示例代码

• 停止播放，移除播放器视图，销毁播放器。

// 停止播放
[self.livePlayer stop];

// 移除播放器视图
self.livePlayer.playerView.hidden = YES;

// 销毁播放器
[self.livePlayer destroy];
self.livePlayer = nil

• 销毁 RTC 房间，销毁 RTC 引擎。

// 销毁 RTC 房间
[self.rtcRoom destroy];
self.rtcRoom = nil;

// 销毁 RTC 引擎
[ByteRTCVideo destroyRTCVideo];
self.rtcVideo = nil;