iOS使用原生AVCapture系列-移动开发

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概述：

可用于音频、二维码、拍照、录制视频（均可自定义界面）

常见的输出信号：

AVCaptureAudioDataOutput 音频输出
AVCaptureFileOutput 文本输出
AVCaptureMetadataOutput 二维码条形码…
AVCaptureStillImageOutput 拍照
AVCaptureMovieFileOutput 录制视频（不能实现暂停录制和定义视频文件类型）
AVCaptureVideoDataOutput + AVCaptureAudioDataOutput 录制视频的灵活性更强（能实现暂停录制和定义视频文件类型）

AVCaptureMovieFileOutput输出流实现视频录制

初始化会话层


-(void)sessionConfiguration{

  //初始化一个会话
  session = [[AVCaptureSession alloc] init];
  [session setSessionPreset:AVCaptureSessionPresetMedium];

  //创建视频设备
  AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

  //根据设备创建输入信号
  deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];

  //添加 输出设备 movieFile
  self.deviceMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

  [session beginConfiguration];
  //session添加设备输入信号
  if ([session canAddInput:deviceInput]) {
    [session addInput:deviceInput];
  }
  //session添加设备输出信号
  if ([session canAddOutput:self.deviceMovieFileOutput]) {
    [session addOutput:self.deviceMovieFileOutput];
  }
  [session commitConfiguration];
}

创建预览图层


-(void)embedLayerWithView:(UIView *)view{
  if (session == nil) {
    return;
  }
  videoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];
  //设置图层的大小
  videoPreviewLayer.frame = view.bounds;
  videoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
  [view.layer addSublayer:videoPreviewLayer];
  [session startRunning];
}

录制视频


-(void)takePhoto:(NSURL *)fileURL{
  [self.deviceMovieFileOutput startRecordingToOutputFileURL:fileURL recordingDelegate:self];
}

结束录制


-(UIImageView *)finishRecord:(UIView *)view isAnewRecording:(BOOL)anewRecording{
  gifImageView = [[UIImageView alloc] initWithFrame:view.bounds];
  [view addSubview:gifImageView];
  isAnewRecording = anewRecording; //存储是否重新录制
  //停止录制(停止录制后做代理方法)
  [self.deviceMovieFileOutput stopRecording];
  return gifImageView;
}

拍摄视频保存路径


+(NSString *)getVideoSaveFilePath{
  NSString*documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
  NSString *filePath = [documentPath stringByAppendingPathComponent:@"video.mp4"];
  return filePath;
}

会话层启动和关闭


-(void)startCamera{
  [session startRunning];
}

-(void)stopCamera{
  [session stopRunning];
}

代理方法


- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{

  NSLog(@"完成录制");
  NSLog(@"outputFileURL = %@",outputFileURL);

  //**重新录制**//
  if (isAnewRecording) {
    //**删除视频文件**//
    NSFileManager *manager = [NSFileManager defaultManager];
    [manager removeItemAtPath:outputFileURL.absoluteString error:nil];
  }
  //**不取消录制**//
  else{
    //**获取视频时长**//
    AVURLAsset *avUrl = [AVURLAsset URLAssetWithURL:outputFileURL options:nil];
    CMTime time = [avUrl duration];
    int seconds = ceil(time.value/time.timescale);

    NSLog(@"seconds = %d",seconds);

    if ([self.delegate respondsToSelector:@selector(videoDuration:)]) {
      [self.delegate videoDuration:seconds];
    }
    if ([self.delegate respondsToSelector:@selector(playerVideo:)]) {
      [self.delegate playerVideo:outputFileURL.absoluteString];
    }
  }
}

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