iOS视频播放-AVPlayer和AVPlayerLayer

本文计划使用AVPlayer和AVPlayerLayer播放视频格式

• m4v:MP4的特殊类型，MP4格式的高清；可包含字幕
• mp4：音频、视频信息的压缩编码标准。
• srt：字幕文件格式

一.播放m4v格式

可通过MP4格式的文件+字幕文件合成m4v格式，可用Subler工具合成

Subler.jpg

 func playMovieFromLocalFile(fileFullName: String) -> Bool {
        
        guard FileManager.default.fileExists(atPath: fileFullName) else {
            debugPrint("\(fileFullName) not Found")
            return false
        }
        
        //加载视频文件资源（包括视频与所有字幕）
        let asset = AVAsset(url: URL(fileURLWithPath: fileFullName))
        let playerItem = AVPlayerItem(asset: asset)
        
        //视频文件中所有支持的字幕
        for characteristic in asset.availableMediaCharacteristicsWithMediaSelectionOptions {
            
            debugPrint("\(characteristic)")
            
            if let group = asset.mediaSelectionGroup(forMediaCharacteristic: characteristic) {
                for option in group.options {
                    debugPrint("  Option: \(option.displayName)")
                }
            }
        }
        
        if let group = asset.mediaSelectionGroup(forMediaCharacteristic: AVMediaCharacteristic.legible) {
            
            let locale = Locale(identifier: "zh")
            let options =
                AVMediaSelectionGroup.mediaSelectionOptions(from: group.options, with: locale)
            if let option = options.first {
                // 如果支持中文，默认选中中文字幕
                playerItem.select(option, in: group)
            }
        }
        
        player = AVPlayer(playerItem: playerItem)
        player?.appliesMediaSelectionCriteriaAutomatically = false
        
        if playerLayer == nil {
            playerLayer = AVPlayerLayer(player: player)
            playerLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
            playerContainerView?.layer.addSublayer(playerLayer!)
        }
        
        setupPlayerObserverEvent()
        
        return true
    }
    
    
    override func viewDidAppear(_ animated: Bool) {
        playerLayer?.frame = playerContainerView!.bounds
    }
    

效果图如下：

overview_1.png

二.播放mp4格式带srt字幕

mp4文件和字幕srt文件通过时间軕实现当前播放进度展示相应文本。
srt格式解析可参考AVPlayerViewController-Subtitles

  
  func playMovie(movieFile: String, captionFile: String) -> Bool {
        
        let fileManage = FileManager.default
        guard fileManage.fileExists(atPath: movieFile) && fileManage.fileExists(atPath: captionFile) else {
            debugPrint("movie:\(movieFile)/ or captionFile:\(captionFile)not found")
            return false
        }
        
        //加载视频文件
        player =  AVPlayer(url: URL(fileURLWithPath: movieFile))
        //加载视频文件对应字幕文件
        parser = Subtitles(file: URL(fileURLWithPath: captionFile))
    
        //创建AVPlayerLayer并加入到视图层中
        playerLayer = AVPlayerLayer(player: player)
        playerLayer!.videoGravity = AVLayerVideoGravity.resizeAspectFill
        playerContainerView?.layer.addSublayer(playerLayer!)
        setupPlayerObserverEvent()
        
        return true
    }

效果图如下：

overview_2.png

三.两种方式需要手动播放或暂停

  
    @IBAction func handleStartPlayerEvent(sender: AnyObject) {
        isPlaying = true
        player?.play()
    }
    
    @IBAction func handlePausePlayerEvent(sender: AnyObject) {
        
        if isPlaying {
            player?.pause()
        }
    }