MG--音视频采集

• 代码下载

直播喵播MGMiaoBo下载

一、视频的开始采集和停止采集

• 开始采集步骤：

  • 1.创建捕捉会话

          // 1.创建捕捉会话
          let session = AVCaptureSession()```

  - 2.给捕捉会话设置输入源(摄像头)
![获取device的几种方法.png](http://upload-images.jianshu.io/upload_images/1429890-7f1a13d562b94904.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

    // 2.获取捕捉会话的输入源
    // 2.1获取摄像头设备
    guard let devices = AVCaptureDevice.devices(withMdeiaType: AvMediaTypeVideo) as? [AVCaptureDevice] else { return } 
    guard let device = devices.filter({ $0.position == .fornt }).first else { return } 
    
    // 2.2通过device创建AVCaptureInput对象
    guard let videoInput = AVCaptureDeviceInput(device: device) else { return } 
    
    // 2.3将input添加到会话中
    session.addInput(videoInput)```

• 3.绘制捕捉会话的输出源

        // 3.给捕捉会话设置输出源
        let videoOutput = AVCaptureVideoDataOutput()
        videoOutput.setSamoleBufferDelegate(self,queue: DdispatchQueue.global())
        session.addOutput(videoOutput)```
  - 4.给用户设置一个可以看到的图层(可选)

    // 4.给用户看到一个预览图层
    let preViewLayer = AVCaptureVideoPreviewLayer()
    preViewLayer.frame = view.bounds
    view.layer.addSubLayer(preViewLayer)```

• 5.开始采集

        // 5.开始采集
        session.startRunning()```
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- ###停止采集步骤
  - 1.让session停止采集
  - 2.移除预览图层
![](http://upload-images.jianshu.io/upload_images/1429890-cb496322af8b5670.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

- ###设置代理，执行代理方法
  ![](http://upload-images.jianshu.io/upload_images/1429890-c2e79b26c692d1ad.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

- ###iOS 10在info.plist设置摄像头权限
![Paste_Image.png](http://upload-images.jianshu.io/upload_images/1429890-5b39ea6ea3a0541f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
- 参考代码（设置视频采集） 
  - ```
func setVideoCapture()
    {
        // 1.创建捕捉会话
        let session = AVCaptureSession()
        
        // 2.获取捕捉会话的输入源
        // 2.1获取摄像头设备
        guard let devices = AVCaptureDevice.devices(withMdeiaType: AvMediaTypeVideo) as? [AVCaptureDevice] else { return } 
        guard let device = devices.filter({ $0.position == .fornt }).first else { return } 
        
        // 2.2通过device创建AVCaptureInput对象
        guard let videoInput = AVCaptureDeviceInput(device: device) else { return } 
        
        // 2.3将input添加到会话中
        session.addInput(videoInput)
        
        // 3.给捕捉会话设置输出源
        let videoOutput = AVCaptureVideoDataOutput()
        videoOutput.setSamoleBufferDelegate(self,queue: DdispatchQueue.global())
        session.addOutput(videoOutput)
        
        // 4.给用户看到一个预览图层
        let preViewLayer = AVCaptureVideoPreviewLayer()
        preViewLayer.frame = view.bounds
        view.layer.addSubLayer(preViewLayer)
        
        // 5.开始采集
        session.startRunning()
    }  ```

##注意： 会话session和预览图层使用强引用，懒加载属性即可(截图展示)
![完整代码展示.png](http://upload-images.jianshu.io/upload_images/1429890-567e605f6a2da472.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
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#二、音频的开始采集和停止采集
步骤和视频一样，这里贴出不同之处的核心代码
![音频的开始采集](http://upload-images.jianshu.io/upload_images/1429890-3466060f97306469.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

- ###iOS 10在info.plist设置摄像头权限
![Paste_Image.png](http://upload-images.jianshu.io/upload_images/1429890-5b39ea6ea3a0541f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

##注意： 由于音视频的代理方法相同，我们根据connection区分音视频
![](http://upload-images.jianshu.io/upload_images/1429890-6e9e20fc010aac59.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

![connection.png](http://upload-images.jianshu.io/upload_images/1429890-475f592d5dda5969.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](http://upload-images.jianshu.io/upload_images/1429890-a72edccba3ef2641.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

**至此，完成简单的音视频采集**
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- ###切换摄像头
![切换摄像头.png](http://upload-images.jianshu.io/upload_images/1429890-a8d1585ff272b3a0.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

- ###保存视频
  - 添加写入文件的output(在开始采集视频的时候开始写入)
![](http://upload-images.jianshu.io/upload_images/1429890-1758391661189181.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
  - 代理，可监听什么时候开始写入（在停止采集视频的时候停止文件写入）
![写入.png](http://upload-images.jianshu.io/upload_images/1429890-60e3dc1a8d053cb5.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![代理](http://upload-images.jianshu.io/upload_images/1429890-06646f76e7c75aae.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![停止录制](http://upload-images.jianshu.io/upload_images/1429890-80c7ffcf2e2d3ac3.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

####后续会放上完整代码补充、



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- #github

|  项目  |  简介    |  
    | : | : |
    |  [MGDS_Swif](https://github.com/LYM-mg/MGDS_Swift)  |  逗视视频直播 |
    |  [MGMiaoBo](https://github.com/LYM-mg/MGMiaoBo)  |  喵播视频直播 |  
    |  [MGDYZB](https://github.com/LYM-mg/MGDYZB)  |  斗鱼视频直播 |
    |  [MGDemo](https://github.com/LYM-mg/MGDemo)  |  n多小功能合集 |  
    |   [MGBaisi](https://github.com/LYM-mg/MGBaisi)   |  高度仿写百思   | 
    |   [MGSinaWeibo](https://github.com/LYM-mg/MGSinaWeibo)   | 高度仿写Sina   | 
    |   [MGLoveFreshBeen](https://github.com/LYM-mg/MGLoveFreshBeen)   |  一款电商App   | 
    |   [MGWeChat](https://github.com/LYM-mg/MGWeChat)   |  小部分实现微信功能   | 
    |  [MGTrasitionPractice](https://github.com/LYM-mg/MGTrasitionPractice)   |  自定义转场练习   | 
    |  [DBFMDemo](https://github.com/LYM-mg/DBFMDemo)  |  豆瓣电台   | 
    | [MGPlayer](https://github.com/LYM-mg/MGPlayer)  |  一个播放视频的Demo   | 
    |  [MGCollectionView](https://github.com/LYM-mg/MGCollectionView)  |  环形图片排布以及花瓣形排布   | 
    |  [MGPuBuLiuDemo](https://github.com/LYM-mg/MGPuBuLiuDemo)  |  瀑布流--商品展   | 
    |  [MGSlideViewDemo](https://github.com/LYM-mg/MGSlideViewDemo)  |  一个简单点的侧滑效果，仿QQ侧滑   | 
    | [MyResume](https://github.com/LYM-mg/MyResume)  |  一个展示自己个人简历的Demo   | 
    |  [GoodBookDemo](https://github.com/LYM-mg/GoodBookDemo) |  好书   | 

   - #[1、直播喵播MGMiaoBo下载](https://github.com/LYM-mg/MGMiaoBo)
   - #[2、逗视：逗你玩的直播App，可下载试玩](https://github.com/LYM-mg/MGDS_Swift)
  - >#看下效果
![逗视介绍1.gif](http://upload-images.jianshu.io/upload_images/1429890-ecd25e08d367c32e.gif?imageMogr2/auto-orient/strip)
![逗视介绍2.gif](http://upload-images.jianshu.io/upload_images/1429890-91b427263bc09abd.gif?imageMogr2/auto-orient/strip)
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