使用WebRTC重放在重复转到后台后停止工作

我正在使用WebRTC创建一个对等连接,用于共享屏幕和音频。我正在使用ReplayKit捕获屏幕,它生成 CMSampleBufferRef RTCVideoFrame .

为了得到 我用的是:

[[RPScreenRecorder sharedRecorder] startCaptureWithHandler:^(CMSampleBufferRef  _Nonnull sampleBuffer, RPSampleBufferType bufferType, NSError * _Nullable error)

当我开始将应用程序发送到后台并多次返回时,问题就出现了;然后ReplayKit停止调用他的捕获处理程序。 只有当我把 CMSampleBufferRef 对于WebRTC,很明显ReplayKit问题与WebRTC有关。如果我从代码中删除这一行,问题就不会发生(但显然WebRTC不起作用)。

[self->source capturer:self->capturer didCaptureVideoFrame:videoFrame];

我能让它再次工作的唯一方法就是重启设备。即使关闭应用程序并重新启动也不起作用。

我就是这样创造的 RTCVideoTrack

- (RTCVideoTrack *)createLocalVideoTrack {

   self->source = [_factory videoSource];

   self->capturer = [[RTCVideoCapturer alloc] initWithDelegate:self->source];

   [self->source adaptOutputFormatToWidth:441 height:736 fps:15];

   return [_factory videoTrackWithSource:self->source trackId:@"ARDAMSv0"];
}

以下是我如何转换 到 rtc视频帧 并发送到WebRTC:

- (void)didCaptureSampleBuffer:(CMSampleBufferRef)sampleBuffer {

  if (CMSampleBufferGetNumSamples(sampleBuffer) != 1 || !CMSampleBufferIsValid(sampleBuffer) ||
    !CMSampleBufferDataIsReady(sampleBuffer)) {
    return;
  }

  CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
  if (pixelBuffer == nil) {
    return;
  }

  RTCCVPixelBuffer *rtcPixelBuffer = [[RTCCVPixelBuffer alloc] initWithPixelBuffer:pixelBuffer];
  int64_t timeStampNs =
  CMTimeGetSeconds(CMSampleBufferGetPresentationTimeStamp(sampleBuffer)) * NSEC_PER_SEC;
  RTCVideoFrame *videoFrame = [[RTCVideoFrame alloc] initWithBuffer:rtcPixelBuffer rotation:RTCVideoRotation_0 timeStampNs:timeStampNs];

  [self->source capturer:self->capturer didCaptureVideoFrame:videoFrame];
}