ios录制小视频(仿微信/钉钉)

App开发

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公司的App里面需要添加个发送小视频功能，需要尽快搞出来，直接让模仿微信的小视频。查资料得出：

一.调用UIImagePickerController，这个相对来说比较简单，不过这个控制录制最大时长比较麻烦，代码如下：

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- (IBAction)recordBegin:(id)sender {
    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    ipc.sourceType = UIImagePickerControllerSourceTypeCamera;
    ipc.cameraDevice = UIImagePickerControllerCameraDeviceRear;//设置使用哪个摄像头，这里设置为后置摄像头
    ipc.mediaTypes = @[(NSString *)kUTTypeMovie];
    ipc.videoQuality = UIImagePickerControllerQualityTypeIFrame1280x720;
    ipc.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;
    ipc.delegate = self;
    [self presentViewController:ipc animated:YES completion:nil];
}
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#pragma mrak - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {
    NSString *mediaType=[info objectForKey:UIImagePickerControllerMediaType];
   if([mediaType isEqualToString:(NSString *)kUTTypeMovie]){
        NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];
    }
    [self dismissViewControllerAnimated:YES completion:nil];
}

二.使用AVFoundation提供的录像，步骤大概分以下几个

1.获取摄像头授权 

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- (void)getAuthorization {
    switch ([AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo]) {
        case AVAuthorizationStatusAuthorized: {  // 已授权，可使用
            [self setupAVCaptureInfo];
            break;
        }
        case AVAuthorizationStatusNotDetermined: { //未进行授权选择再次请求授权
            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL	granted) {
                if (granted) {
                    [self setupAVCaptureInfo];
                } else {
                    [self showAuthorizationAlert];
                }
                return;
            }];
            break;
        }
        default: {  //用户拒绝授权/未授权
            [self showAuthorizationAlert];
            break;
        }
    }
}
// 显示没有授权的提示框
- (void)showAuthorizationAlert {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"拒绝授权,返回上一页.请检查下\n设置-->隐私/通用等权限设置" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
    [alert show];
}

2.创建AVCaptureSession对象 

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- (void)setupAVCaptureInfo {
    _captureSession = [[AVCaptureSession alloc] init];
    if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset640x480]) {
        [_captureSession setSessionPreset:AVCaptureSessionPreset640x480];
    }
    
    [_captureSession beginConfiguration];
    
    [self addVideo];		// 添加视频输入源
    [self addAudio];		// 添加音频输入源
    [self addOutput];
    [self addPreviewLayer];	// 添加预览
    
    [_captureSession commitConfiguration];
    [_captureSession startRunning];
}

3.添加输入源 

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- (void)addVideo {
    // 获取后置摄像头
    _videoDevice = [self deviceWithMediaType:AVMediaTypeVideo preferringPosition:AVCaptureDevicePositionBack];
    // 将视频输入添加到captureSession
    NSError *videoError;
    _videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:_videoDevice error:&videoError];
    if (nil == videoError) {
        if ([_captureSession canAddInput:_videoInput]) {
            [_captureSession addInput:_videoInput];
        }
    }
}

- (void)addAudio {
    NSError *audioError;
    _audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
    _audioInput = [[AVCaptureDeviceInput alloc] initWithDevice:_audioDevice error:&audioError];
    if (nil == audioError) {
        // 将音频输入对象添加到会话 (AVCaptureSession) 中
        if ([_captureSession canAddInput:_audioInput]) {
            [_captureSession addInput:_audioInput];
        }
    }
}

// 获取前/后摄像头
- (AVCaptureDevice *)deviceWithMediaType:(NSString *)mediaType preferringPosition:(AVCaptureDevicePosition)position {
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:mediaType];
    AVCaptureDevice *captureDevice = devices.firstObject;
    for (AVCaptureDevice *device in devices ) {
        if (device.position == position ) {
            captureDevice = device;
            break;
        }
    }
    return captureDevice;
}

4.添加预览 

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- (void)addPreviewLayer {
    _captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];
    _captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    _captureVideoPreviewLayer.connection.videoOrientation = [_movieOutput connectionWithMediaType:AVMediaTypeVideo].videoOrientation;
    _captureVideoPreviewLayer.frame = self.view.layer.bounds;
    [self.view.layer insertSublayer:_captureVideoPreviewLayer atIndex:0];
}

5.添加输出源 （输出源先介绍两种种方式，一种AVCaptureMovieFileOutput直接将视频写入文件，如果不需要对视频做其他处理的话，用AVCaptureMovieFileOutput相对来容易点，代码量也会少很多。另外一种同时添加AVCaptureVideoDataOutput和AVCaptureAudioDataOutput，这个保存的时候需要用AVAssetWriterInput将音视频写入文件）

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// AVCaptureMovieFileOutput
- (void)addOutput {
    // 将视频输出添加到captureSession
    _movieOutput = [[AVCaptureMovieFileOutput alloc] init];
    if ([_captureSession canAddOutput:_movieOutput]) {
        [_captureSession addOutput:_movieOutput];
        AVCaptureConnection *captureConnection = [_movieOutput connectionWithMediaType:AVMediaTypeVideo];
        if ([captureConnection isVideoOrientationSupported]) {
            [captureConnection setVideoOrientation:AVCaptureVideoOrientationPortrait];
        }
        // 视频稳定设置
//        if ([captureConnection isVideoStabilizationSupported]) {
//            captureConnection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeAuto;
//        }
        captureConnection.videoScaleAndCropFactor = captureConnection.videoMaxScaleAndCropFactor;
    }
}

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视频没有特殊处理的用上面那个方法就可以了，AVCaptureVideoDataOutput和AVCaptureAudioDataOutput有时间单独开一篇。
6. 开始录像和停止录像 
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- (void)startRecord {
    [_movieOutput startRecordingToOutputFileURL:[self outPutFileURL] recordingDelegate:self];
}

- (void)stopRecord {
    [_movieOutput stopRecording];
}

- (NSURL *)outPutFileURL {
    return [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@%@", NSTemporaryDirectory(), @"tempOutPut.mov"]];
}

简单的录制视频就算完成了，领导后来要求要和钉钉或者qq的小视频一样，视频可以分段删除。花了一天时间找分段删除方法也没找到合适的，后来果断每一段就是一个视频（一个视频有多个小视频组成），android和ios可以连续播放多个视频，也和一个视频差不多，不过后台不愿意这样干（不知道是不是那边没找到联系播放多个的好方法），没办法啊，后来打算用ffmpeg将多个视频拼接成一个视频。

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Demo