腾讯直播SDK接入及封装（一）之录屏直播

1.省略集成SDK环节，具体的集成以官方为主，这里只是快速接入的参考；

2.获取系统相机、麦克风、屏幕录制等的权限，这里以麦克风为例：

func checkMicroPermission() -> Bool {
    let authStatus = AVCaptureDevice.authorizationStatus(for: .audio)
    switch (authStatus) {
    case .authorized:
        //授权
        return true
    case .notDetermined, .restricted, .denied:
        return false
        default:
        return false
    }
}

根据用户设置询问是否授权

if !checkMicroPermission() {
    AVCaptureDevice.requestAccess(for: .audio) { granted in
        if granted {
            DispatchQueue.main.async {
                //授权成功后进行后续操作
            }
        }
    }
}

3.直播封装

1.创建一个单例保持直播一直在运作
class LiveManager: NSObject {
    static let shared = LiveManager()
    //防止外界init
    private override init() {
        
    }
}

2.创建直播推流及直播拉流
private var livePusher: V2TXLivePusher?
private var livePlayer: V2TXLivePlayer = {
    let txPlayer = V2TXLivePlayer()
    return txPlayer
}()

3.开启录屏直播（注：在此之前从后端拿到推流地址，pushUrl：推流地址）
func startRecord(_ pushUrl: String) {
    if self.livePusher != nil {
        self.livePusher?.stopScreenCapture()
        self.livePusher?.stopPush()
    }
    //开启录屏
    TRTCBroadcastExtensionLauncher.launch()
    //推流，liveMode选择RTC，因为后面要接入连麦功能的时候只能用这个，如果选RTMP连麦混流会有问题
    let pusher = V2TXLivePusher(liveMode: .RTC)
    //注册观察者
    pusher?.setObserver(self)
    self.livePusher = pusher
    //这里可以根据文档来填
    pusher?.startScreenCapture("xx.xx.xx")
    pusher?.startMicrophone()
    let videoParam = V2TXLiveVideoEncoderParam()
    //这个resolution640x360根据自己的情况来，并不是越高越好
    videoParam.videoResolution = .resolution640x360
    //横竖屏模式，我们这边是录制游戏横屏，根据自己的情况设置
    videoParam.videoResolutionMode = .landscape
    pusher?.setVideoQuality(videoParam)
    pusher?.setAudioQuality(.default)
    let code = pusher?.startPush(pushUrl)
    if code != V2TXLiveCode.TXLIVE_OK {
        //这里是失败的情况
        pusher?.stopMicrophone()
        pusher?.stopScreenCapture()
    }
}

然后是关闭直播

func stopRecord() {
    if self.livePusher != nil {
        self.livePusher?.stopScreenCapture()
        self.livePusher?.stopPush()
    }
}

然后是客户端进行拉流操作