iOS使用原生AVCapture系列

更新時(shí)間：2018年10月16日 11:44:02 作者：jadyn_JT

這篇文章主要為大家詳細(xì)介紹了iOS使用原生AVCapture系列的相關(guān)資料，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

概述：

可用于音頻、二維碼、拍照、錄制視頻（均可自定義界面）

常見(jiàn)的輸出信號(hào)：

AVCaptureAudioDataOutput 音頻輸出
AVCaptureFileOutput 文本輸出
AVCaptureMetadataOutput 二維碼條形碼…
AVCaptureStillImageOutput 拍照
AVCaptureMovieFileOutput 錄制視頻（不能實(shí)現(xiàn)暫停錄制和定義視頻文件類(lèi)型）
AVCaptureVideoDataOutput + AVCaptureAudioDataOutput 錄制視頻的靈活性更強(qiáng)（能實(shí)現(xiàn)暫停錄制和定義視頻文件類(lèi)型）

AVCaptureMovieFileOutput輸出流實(shí)現(xiàn)視頻錄制

初始化會(huì)話(huà)層

-(void)sessionConfiguration{

  //初始化一個(gè)會(huì)話(huà)
  session = [[AVCaptureSession alloc] init];
  [session setSessionPreset:AVCaptureSessionPresetMedium];

  //創(chuàng)建視頻設(shè)備
  AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

  //根據(jù)設(shè)備創(chuàng)建輸入信號(hào)
  deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];

  //添加 輸出設(shè)備 movieFile
  self.deviceMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

  [session beginConfiguration];
  //session添加設(shè)備輸入信號(hào)
  if ([session canAddInput:deviceInput]) {
    [session addInput:deviceInput];
  }
  //session添加設(shè)備輸出信號(hào)
  if ([session canAddOutput:self.deviceMovieFileOutput]) {
    [session addOutput:self.deviceMovieFileOutput];
  }
  [session commitConfiguration];
}

創(chuàng)建預(yù)覽圖層

-(void)embedLayerWithView:(UIView *)view{
  if (session == nil) {
    return;
  }
  videoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];
  //設(shè)置圖層的大小
  videoPreviewLayer.frame = view.bounds;
  videoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
  [view.layer addSublayer:videoPreviewLayer];
  [session startRunning];
}

錄制視頻

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

結(jié)束錄制

-(UIImageView *)finishRecord:(UIView *)view isAnewRecording:(BOOL)anewRecording{
  gifImageView = [[UIImageView alloc] initWithFrame:view.bounds];
  [view addSubview:gifImageView];
  isAnewRecording = anewRecording; //存儲(chǔ)是否重新錄制
  //停止錄制(停止錄制后做代理方法)
  [self.deviceMovieFileOutput stopRecording];
  return gifImageView;
}

拍攝視頻保存路徑

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

會(huì)話(huà)層啟動(dòng)和關(guān)閉

-(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(@"完成錄制");
  NSLog(@"outputFileURL = %@",outputFileURL);

  //**重新錄制**//
  if (isAnewRecording) {
    //**刪除視頻文件**//
    NSFileManager *manager = [NSFileManager defaultManager];
    [manager removeItemAtPath:outputFileURL.absoluteString error:nil];
  }
  //**不取消錄制**//
  else{
    //**獲取視頻時(shí)長(zhǎng)**//
    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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