使用原生AVCapture系列

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）

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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];        }    }}