1）設置視頻采集來源為攝像頭 聲明以下屬性 ``` @property?(nonatomic, strong) NECamera?*camera;//作為外部攝像頭 @property?(nonatomic, assign) BOOLisStop; @property?(nonatomic, strong) LSVideoParaCtxConfiguration* paraCtx;//推流視頻參數設置 ``` 2）設置屬性 ``` - (void)viewWillDisappear:(BOOL)animated { _isStop= YES; ? ? [superview WillDisappear:animated]; [NEMediaCaptureEntity sharedInstance].videoParaCtx= paraCtx; } ``` paraCtx.isUseExternalCapture?= YES;//是否使用外部視頻采集,假設使用外部采集時，攝像頭的采集幀率一定要于設置的paraCtx.fps一致，同時碼率要調整為對應的碼率,對應的分辨率也需要調整 3）使用外部視頻采集 ``` if (streamparaCtx.sLSVideoParaCtx.isUseExternalCapture) { ? ? ? ? ? ? //1.從外部攝像頭獲取數據 ? ? ? ? ? ? _camera = [[NECamera alloc] initWithCameraPosition:AVCaptureDevicePositionFront captureFormat:kCVPixelFormatType_32BGRA]; ? ? ? ? ? ? _camera.delegate = self; ? ? ? ? ? ? [_camera startCapture]; ? ? } ``` 4）在NECameraDelegate的視頻渲染方法中初始化美狐shader ``` //外部采集攝像頭的數據塞回來給SDK推流 -(void)didOutputVideoSampleBuffer:(CMSampleBufferRef)sampleBuffer{ if(!_isStop){ CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); OSType formatType = CVPixelBufferGetPixelFormatType(pixelBuffer); [self.beautyManager processWithPixelBuffer:pixelBuffer formatType:formatType]; ? ? } [self.mediaCaptureexternalInputSampleBuffer:sampleBuffer]; } ```