• (void)broadcastStartedWithSetupInfo:(NSDictionary<NSString *,NSObject *> *)setupInfo {
  // User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.
  // 宿主 app开始直播屏幕的时候这里会走一次
  // 设置 socket
  }

• (void)broadcastPaused {
  // User has requested to pause the broadcast. Samples will stop being delivered.
  }

• (void)broadcastResumed {
  // User has requested to resume the broadcast. Samples delivery will resume.
  }

• (void)broadcastFinished {
  // User has requested to finish the broadcast.
  }

// 实时采集数据

• (void)processSampleBuffer:(CMSampleBufferRef)sampleBuffer withType:(RPSampleBufferType)sampleBufferType {

  switch (sampleBufferType) {
  case RPSampleBufferTypeVideo:
  // Handle video sample buffer
  break;
  case RPSampleBufferTypeAudioApp:
  // Handle audio sample buffer for app audio
  break;
  case RPSampleBufferTypeAudioMic:
  // Handle audio sample buffer for mic audio
  break;

    default:
        break;
  

  }
  }

IOS 屏幕共享拓展 Broadcast Unload Extension 返回的数据sampleBuffer是什么数据，传到宿主app并且通过webrtc渲染出来需要做哪些处理呢？