1） 設置視頻采集來源為攝像頭(Set video capture source as camera) 聲明以下屬性(Declare the following properties) ``` @property (nonatomic, strong) NECamera *camera;//作為外部攝像頭 @property (nonatomic, assign) BOOL isStop; @property (nonatomic, strong) LSVideoParaCtxConfiguration* paraCtx;//推流視頻參數設置 ``` 2） 設置屬性(set a property) ``` - (void)viewWillDisappear:(BOOL)animated { _isStop = YES; [super viewWillDisappear: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(Whether to use external video acquisition. If external acquisition is used, the acquisition frame rate of the camera must be different from the set paractx FPS is consistent. At the same time, the code rate should be adjusted to the corresponding code rate, and the corresponding resolution also needs to be adjusted) 3）使用外部視頻采集(Using external video capture) ``` 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(Initialize the Meihu shader in the video rendering method of NECameraDelegate) //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 processWithRoatePixelBuffer:pixelBuffer formatType:formatType]; } [self.mediaCapture externalInputSampleBuffer:sampleBuffer]; } ```