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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