手把手教你实现微信小视频iOS代码实现

3.1.3 视频输出设置
视频输出设置需要注意的问题是：要设置videoConnection的方向，这样才能保证设备旋转时的显示正常。 

 //Video
      if ([self.session canAddInput:_videoDeviceInput]) {
        
        [self.session addInput:_videoDeviceInput];
        self.videoDeviceInput = _videoDeviceInput;
        [self.session removeOutput:_videoDataOutput];
        
        AVCaptureVideoDataOutput *videoOutput = [[AVCaptureVideoDataOutput alloc] init];
        _videoDataOutput = videoOutput;
        videoOutput.videoSettings = @{ (id)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_32BGRA) };
        
        [videoOutput setSampleBufferDelegate:self queue:_videoDataOutputQueue];
        
        videoOutput.alwaysDiscardsLateVideoFrames = NO;
        
        if ( [_session canAddOutput:videoOutput] ) {
          [_session addOutput:videoOutput];
          
          [_captureDevice addObserver:self forKeyPath:@"adjustingFocus" options:NSKeyValueObservingOptionNew context:FocusAreaChangedContext];
          
          _videoConnection = [videoOutput connectionWithMediaType:AVMediaTypeVideo];
          
          if(_videoConnection.isVideoStabilizationSupported){
            _videoConnection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeAuto;
          }

          
          UIInterfaceOrientation statusBarOrientation = [UIApplication sharedApplication].statusBarOrientation;
          AVCaptureVideoOrientation initialVideoOrientation = AVCaptureVideoOrientationPortrait;
          if ( statusBarOrientation != UIInterfaceOrientationUnknown ) {
            initialVideoOrientation = (AVCaptureVideoOrientation)statusBarOrientation;
          }
          
          _videoConnection.videoOrientation = initialVideoOrientation;
        }

      }
      else{
        NSLog(@"无法添加视频输入到会话");
      }

//audio
      AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
      AVCaptureDeviceInput *audioDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&error];
      
      
      if ( ! audioDeviceInput ) {
        NSLog( @"Could not create audio device input: %@", error );
      }
      
      if ( [self.session canAddInput:audioDeviceInput] ) {
        [self.session addInput:audioDeviceInput];
        
      }
      else {
        NSLog( @"Could not add audio device input to the session" );
      }
      
      AVCaptureAudioDataOutput *audioOut = [[AVCaptureAudioDataOutput alloc] init];
      // Put audio on its own queue to ensure that our video processing doesn't cause us to drop audio
      dispatch_queue_t audioCaptureQueue = dispatch_queue_create( "wukong.movieRecorder.audio", DISPATCH_QUEUE_SERIAL );
      [audioOut setSampleBufferDelegate:self queue:audioCaptureQueue];
      
      if ( [self.session canAddOutput:audioOut] ) {
        [self.session addOutput:audioOut];
      }
      _audioConnection = [audioOut connectionWithMediaType:AVMediaTypeAudio];

								 
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