502 lines
23 KiB
Swift
502 lines
23 KiB
Swift
//
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// MP_AVURLAsset.swift
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// MusicPlayer
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//
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// Created by Mr.Zhou on 2024/5/23.
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//
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import UIKit
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import AVFoundation
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extension URL {
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func convertCustomSchemeURL(_ scheme: String) -> URL? {
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var components = URLComponents(url: self, resolvingAgainstBaseURL: false)
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components?.scheme = scheme
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return components?.url
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}
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}
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///媒体加载协议
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@objc protocol MP_AVPlayerItemDelegate {
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///当媒体项目初次缓存后
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@objc func playerItemReadyToPlay(_ playerItem: MP_AVPlayerItem)
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///当媒体项目收到新缓存后
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@objc func playerItem(_ playerItem: MP_AVPlayerItem, progress:Float)
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///当媒体项目完全加载后
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@objc func playerItem(_ playerItem: MP_AVPlayerItem, didFinishLoadingData data:Data)
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///当媒体项目加载数据中断（比如断网了）,导致停止播放时
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@objc func playerItemPlaybackStalled(_ playerItem: MP_AVPlayerItem)
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///当媒体项目加载错误时调用。
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@objc func playerItem(_ playerItem: MP_AVPlayerItem, loadingError error:Error)
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}
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///自定义媒体项目
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class MP_AVPlayerItem: AVPlayerItem {
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///拦截协议
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var resourceLoaderDelegate:MP_ResourceLoaderDelegate!
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///地址路径
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fileprivate var url:URL
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///原生Scheme
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fileprivate let initialScheme:String?
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///自定义文件扩展名
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fileprivate var customFileExtension:String?
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///拦截式scheme
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fileprivate let customScheme = "myapp"
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///媒体项目标题
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fileprivate var title:String = "Random"
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///媒体ID
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fileprivate var videoId:String = "Random"
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///媒体资产
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fileprivate var resourceAsset:MP_AVURLAsset!
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///媒体项目协议
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weak var delegate:MP_AVPlayerItemDelegate?
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///自定义初始化
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init(url: URL, bitrate:Int64, customFileExtension: String? = "mp4", title:String?, videoId:String?) {
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guard let components = URLComponents(url: url, resolvingAgainstBaseURL: false),
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let scheme = components.scheme,
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var urlWithCustomScheme = url.convertCustomSchemeURL(customScheme) else {
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fatalError("不支持没有scheme的URL")
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}
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self.url = url
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self.initialScheme = scheme
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//将扩展文件名赋予自定义scheme
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if let stringPath = customFileExtension {
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//先删除扩展名（网络文件路径一般没有）
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urlWithCustomScheme.deletePathExtension()
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//扩展路径
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urlWithCustomScheme.appendPathExtension(stringPath)
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//更新自定义文件扩展名
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self.customFileExtension = stringPath
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}
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if let title = title, let videoId = videoId {
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//更新标题
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self.title = title
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self.videoId = videoId
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}
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resourceLoaderDelegate = .init(bitrate)
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resourceAsset = MP_AVURLAsset(url: urlWithCustomScheme, delegate: resourceLoaderDelegate, title: title ?? "")
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//生成一个媒体资产
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super.init(asset: resourceAsset, automaticallyLoadedAssetKeys: nil)
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//为拦截协议传入指定的playerItem
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resourceLoaderDelegate.playItem = self
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//kvo监听项目状态
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addObserver(self, forKeyPath: "status", options: [.old,.new], context: nil)
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//kvo监听项目加载值
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addObserver(self, forKeyPath: "loadedTimeRanges", options: [.old,.new], context: nil)
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//kvo监听项目准备情况
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addObserver(self, forKeyPath: "playbackLikelyToKeepUp", options: [.old,.new], context: nil)
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//kvo监听项目报错
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addObserver(self, forKeyPath: "error", options: [.old,.new], context: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(playbackStalledHandler), name:NSNotification.Name.AVPlayerItemPlaybackStalled, object: self)
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}
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//MARK: - KVO实现
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override open func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
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guard let keyPath = keyPath else {
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return
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}
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//根据keyPath检索
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switch keyPath {
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case "status"://playerItem状态
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if let statuValue = change?[.newKey] as? Int, statuValue == AVPlayerItem.Status.readyToPlay.rawValue {
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//判断当前播放器是否在播放当前音乐中
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print("当前音乐-\(title) 已经准备好播放")
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}
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case "loadedTimeRanges"://当前缓冲进度
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guard self.videoId == MP_PlayerManager.shared.loadPlayer.currentVideo?.song.videoId else {return}
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let timeRanges = self.loadedTimeRanges.map({$0.timeRangeValue})
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//获取当前播放Item的缓冲值组
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if let first = timeRanges.first {
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//获取开始时间的秒数
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let startSeconds = first.start.seconds
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//获取缓冲区的持续时间
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let durationSeconds = first.duration.seconds
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//计算当前缓冲总时间
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let bufferedSeconds = startSeconds + durationSeconds
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//获取当前播放音乐资源的最大时间值
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let maxDuration = CMTimeGetSeconds(self.duration)
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let progress = bufferedSeconds/maxDuration
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//传递缓存值
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delegate?.playerItem(self, progress: Float(progress))
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}
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case "playbackLikelyToKeepUp"://是否存在足够的数据开始播放
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if let playbackLikelyToKeepUp = change?[.newKey] as? Bool, playbackLikelyToKeepUp == true {
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//有足够的数据来支持播放
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delegate?.playerItemReadyToPlay(self)
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}else {
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//没有足够的数据支持播放
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delegate?.playerItemPlaybackStalled(self)
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}
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case "error":
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if let error = change?[.newKey] as? Error {
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print("当前音乐-\(title) 未做好准备播放，失败原因是\(error)")
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delegate?.playerItem(self, loadingError: error)
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}
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default:
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break
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}
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}
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//playerItem突然停止了
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@objc func playbackStalledHandler() {
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delegate?.playerItemPlaybackStalled(self)
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}
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deinit {
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print("已销毁\(title)")
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NotificationCenter.default.removeObserver(self)
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removeObserver(self, forKeyPath: "status")
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removeObserver(self, forKeyPath: "loadedTimeRanges")
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removeObserver(self, forKeyPath: "playbackLikelyToKeepUp")
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removeObserver(self, forKeyPath: "error")
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//终止网络请求
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resourceLoaderDelegate.session?.invalidateAndCancel()
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//清理资产空间
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resourceAsset = nil
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}
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}
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///自定义媒体资产
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class MP_AVURLAsset: AVURLAsset {
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init(url URL: URL, delegate:MP_ResourceLoaderDelegate, title:String) {
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super.init(url: URL, options: nil)
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self.resourceLoader.setDelegate(delegate, queue: .main)
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//对该Asset实现预加载，以让Asset触发resourceLoaderdelegate
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// 加载关键的播放属性
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let keys = ["playable"]
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self.loadValuesAsynchronously(forKeys: keys) {
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[weak self] in
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// 检查加载属性的结果
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for key in keys {
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var error: NSError?
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let status = self?.statusOfValue(forKey: key, error: &error)
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if status == .loaded {
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print("开始对\(title)的预加载")
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} else {
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// 处理加载失败的情况
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print("无法加载 \(key): \(String(describing: error))")
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//一般是网络数据问题，需要重新请求一遍
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}
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}
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}
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}
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}
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///媒体资源加载代理
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class MP_ResourceLoaderDelegate: NSObject, AVAssetResourceLoaderDelegate, URLSessionDelegate, URLSessionDataDelegate, URLSessionTaskDelegate {
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//判断缓存空间的数据是否完整
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private var iscompleted:Bool?
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// 从内存播放时需要
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var mimeType: String?
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//比特率
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var bitrate:Int64
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//网络会话
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var session: URLSession?
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//媒体数据
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var mediaData: Data?
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//媒体数据块
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var mediaDataBlocks: [MediaDataBlock]?
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//响应体
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var response: URLResponse?
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//活跃的加载请求
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var pendingRequests = Set<AVAssetResourceLoadingRequest>()
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//缓存中的最长长度值
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var maxCount:Int64?
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//缓存情况
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var progress:Float = 0
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weak var playItem: MP_AVPlayerItem?
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//最后加载范围
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private var lastRequestedEndOffset:Int64?
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init(_ bitrate:Int64) {
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self.bitrate = bitrate
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super.init()
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//添加关于用手动seek的监听
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NotificationCenter.notificationKey.add(observer: self, selector: #selector(seekAction(_ :)), notificationName: .positive_player_seek)
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}
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func resourceLoader(_ resourceLoader: AVAssetResourceLoader, shouldWaitForLoadingOfRequestedResource loadingRequest: AVAssetResourceLoadingRequest) -> Bool {
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guard let initialUrl = playItem?.url else {
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fatalError("internal inconsistency")
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}
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//判断session是否存在
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if session == nil {
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//判断加载数据方法
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if let media = MP_CacheManager.shared.data(forKey: playItem?.videoId ?? "") {
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print("缓存中存在\(playItem?.title ?? ""),取出中")
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//从缓存中去获取数据，并覆盖响应数据
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mediaData = media.data
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mediaDataBlocks = media.dataBlocks
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//判断是否完整
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if media.isComplete == false {
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print("\(playItem?.title ?? "")数据不完整，开始网络请求相关数据")
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maxCount = media.maxCount
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//缓存中的数据是不完整的，继续网络请求
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continuationDataRequest(with: initialUrl, count: Int64(media.data.count))
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iscompleted = false
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}else {
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iscompleted = true
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DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
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guard let self = self else {return}
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if MP_PlayerManager.shared.loadPlayer.currentVideo?.song.videoId == playItem?.videoId {
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playItem?.delegate?.playerItem(playItem!, didFinishLoadingData: media.data)
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}
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}
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}
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}else {
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print("开始网络请求\(playItem?.title ?? "")相关数据")
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//初次请求
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startDataRequest(with: initialUrl)
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}
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}else {
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}
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pendingRequests.insert(loadingRequest)
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// processPendingRequests()
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return true
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}
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@objc private func seekAction(_ sender:Notification) {
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if playItem?.videoId == MP_PlayerManager.shared.loadPlayer.currentVideo.song.videoId {
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if let progress = sender.object as? Double {
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let requestedOffset = progress * Double(maxCount ?? 0)
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// 测试是否发送网络请求
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if requestedOffset > Double(mediaData?.count ?? 0) {
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print("用户滚动到了当前缓存范围外")
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// 用户seek位置在媒体数据范围内，假设这里已经有了初始URL
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let initialUrl = playItem?.url
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continuationDataRequest(with: initialUrl!, count: Int64(requestedOffset))
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}
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}
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}
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}
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/// 开始网络请求
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/// - Parameters:
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/// - url: 网络请求地址
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func startDataRequest(with url: URL) {
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//取消之前的请求方法
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session?.invalidateAndCancel()
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let configuration = URLSessionConfiguration.default
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configuration.requestCachePolicy = .reloadIgnoringLocalAndRemoteCacheData
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session = URLSession(configuration: configuration, delegate: self, delegateQueue: nil)
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session?.dataTask(with: url).resume()
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}
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///继续请求网络资源（因各种原因中断时）
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/// - Parameters:
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/// - url: 网络请求地址
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/// - data: 数据内容
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func continuationDataRequest(with url: URL, count:Int64) {
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if session == nil {
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let configuration = URLSessionConfiguration.default
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configuration.requestCachePolicy = .reloadIgnoringLocalAndRemoteCacheData
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session = URLSession(configuration: configuration, delegate: self, delegateQueue: nil)
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}else {
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//取消之前的请求方法
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session?.getAllTasks(completionHandler: { tasks in
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//取消所有方法
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tasks.forEach({$0.cancel()})
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})
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}
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//设置一个网络请求
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var request = URLRequest(url: url)
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//设置请求头内容
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let bytes = "bytes=\(count)-"
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request.addValue(bytes, forHTTPHeaderField: "Range")
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request.addValue(url.host ?? "", forHTTPHeaderField: "Host")
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request.addValue("video/mp4", forHTTPHeaderField: "Accept")
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session?.dataTask(with: request).resume()
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}
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func resourceLoader(_ resourceLoader: AVAssetResourceLoader, didCancel loadingRequest: AVAssetResourceLoadingRequest) {
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pendingRequests.remove(loadingRequest)
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}
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// MARK: URLSession
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///网络请求响应体内容
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func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive response: URLResponse, completionHandler: @escaping (URLSession.ResponseDisposition) -> Void) {
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guard response.mimeType?.contains("video") == true else {
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print("\(playItem?.title ?? "")网络地址不可用，响应类型是\(response.mimeType ?? "")")
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//重新请求数据
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MP_NetWorkManager.shared.requestPlayer(playItem?.videoId ?? "", playlistId: "") {[weak self] resourceUrls, coverUrls in
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//只需要重新配置第一条网络资源地址
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guard let self = self else {return}
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print("\(playItem?.title ?? "")重新加载一次")
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let url = URL(string: resourceUrls.0.first ?? "")!
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playItem?.url = url
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if mediaData == nil {
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startDataRequest(with: url)
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}else {
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continuationDataRequest(with: url, count: Int64(mediaData!.count))
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}
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}
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return
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}
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completionHandler(Foundation.URLSession.ResponseDisposition.allow)
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if mediaData == nil {
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mediaData = Data()
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mediaDataBlocks = []
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}
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self.response = response
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processPendingRequests()
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}
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///网络请求数据更新
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func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
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guard let response = dataTask.response as? HTTPURLResponse,
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let contentRange = response.allHeaderFields["Accept-Ranges"] as? String else {
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print("\(playItem?.title ?? "")数据更新失败")
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return
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}
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//从 Content-Range 标头中提取范围信息
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let rangeInfo = extractRangeInfo(contentRange)
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//使用范围的起始偏移量和接收到的数据创建一个 DataSegment
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let dataSegment = MediaDataBlock(offset: (rangeInfo?.start ?? 0), data: data)
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mediaData?.append(data)
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mediaDataBlocks?.append(dataSegment)
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if mediaData != nil {
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//存入缓存数据
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MP_CacheManager.shared.cacheData(mediaData!, dataBlocks: mediaDataBlocks!, forKey: MP_PlayerManager.shared.loadPlayer.currentVideo?.song.videoId ?? "", isComplete: false, maxCount: self.response?.expectedContentLength ?? 0)
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}
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processPendingRequests()
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//更新最后一次加载完成的范围量
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self.lastRequestedEndOffset = Int64(data.count)
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}
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//解析 Content-Range 标头以提取字节范围
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private func extractRangeInfo(_ contentRange: String) -> (start: Int64, end: Int64)? {
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// 正则表达式用于匹配 "bytes start-end/total" 格式
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let pattern = "bytes (\\d+)-(\\d+)/(\\d+|\\*)"
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// 尝试创建正则表达式
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guard let regex = try? NSRegularExpression(pattern: pattern, options: []) else {
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return nil
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}
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// 在 Content-Range 标头中查找匹配项
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let nsRange = NSRange(contentRange.startIndex..<contentRange.endIndex, in: contentRange)
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guard let match = regex.firstMatch(in: contentRange, options: [], range: nsRange) else {
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return nil
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}
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// 提取并转换匹配到的数值
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let startString = (contentRange as NSString).substring(with: match.range(at: 1))
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let endString = (contentRange as NSString).substring(with: match.range(at: 2))
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let totalString = (contentRange as NSString).substring(with: match.range(at: 3))
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guard let start = Int64(startString), let end = Int64(endString), let total = totalString == "*" ? nil : Int64(totalString) else {
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return nil
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}
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return (start: start, end: end)
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}
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///网络请求结束/错误
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func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
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if let errorUnwrapped = error as NSError?, errorUnwrapped.domain == NSURLErrorDomain && errorUnwrapped.code == NSURLErrorCancelled {
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//主动取消了
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print("\(playItem?.title ?? "")网络请求被释放了")
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if mediaData != nil {
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//存入缓存数据
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MP_CacheManager.shared.cacheData(mediaData!, dataBlocks: mediaDataBlocks!, forKey: MP_PlayerManager.shared.loadPlayer.currentVideo?.song.videoId ?? "", isComplete: true, maxCount: response?.expectedContentLength ?? 0)
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}
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processPendingRequests()
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}else if let error = error {
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print("\(playItem?.title ?? "")-网络请求失败，原因为:\(error)")
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playItem?.delegate?.playerItem(playItem!, loadingError: error)
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return
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}else {
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//完成媒体资源加载
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if mediaData != nil {
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//存入缓存数据
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MP_CacheManager.shared.cacheData(mediaData!, dataBlocks: mediaDataBlocks!, forKey: MP_PlayerManager.shared.loadPlayer.currentVideo?.song.videoId ?? "", isComplete: true, maxCount: response?.expectedContentLength ?? 0)
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}
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print("\(playItem?.title ?? "")资源加载完成")
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//更新最后一次加载完成的范围量
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self.lastRequestedEndOffset = response?.expectedContentLength
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processPendingRequests()
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playItem?.delegate?.playerItem(playItem!, didFinishLoadingData: mediaData!)
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}
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}
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func processPendingRequests() {
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// 获取所有已满的请求
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let requestsFulfilled = Set<AVAssetResourceLoadingRequest>(pendingRequests.compactMap {
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self.fillInContentInformationRequest($0.contentInformationRequest)
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if self.haveEnoughDataToFulfillRequest($0.dataRequest!) {
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$0.finishLoading()
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return $0
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}
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return nil
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})
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// 从待处理的请求中删除已完成的请求
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_ = requestsFulfilled.map { self.pendingRequests.remove($0) }
|
||
|
||
}
|
||
///填写contentInformationRequest
|
||
func fillInContentInformationRequest(_ contentInformationRequest: AVAssetResourceLoadingContentInformationRequest?) {
|
||
//如果缓存数据加载完全了
|
||
if iscompleted == true {
|
||
contentInformationRequest?.contentType = "video/mp4"
|
||
self.maxCount = Int64(mediaData!.count)
|
||
contentInformationRequest?.contentLength = Int64(mediaData!.count)
|
||
contentInformationRequest?.isByteRangeAccessSupported = true
|
||
return
|
||
}
|
||
//通过获取响应体，填写contentInformationRequest
|
||
if let responseUnwrapped = response {
|
||
contentInformationRequest?.contentType = responseUnwrapped.mimeType
|
||
self.maxCount = responseUnwrapped.expectedContentLength
|
||
contentInformationRequest?.contentLength = responseUnwrapped.expectedContentLength
|
||
contentInformationRequest?.isByteRangeAccessSupported = true
|
||
}else if let maxCount = maxCount {
|
||
contentInformationRequest?.contentType = "video/mp4"
|
||
contentInformationRequest?.contentLength = maxCount
|
||
contentInformationRequest?.isByteRangeAccessSupported = true
|
||
}
|
||
}
|
||
///判读请求是否有足够的数据
|
||
func haveEnoughDataToFulfillRequest(_ dataRequest: AVAssetResourceLoadingDataRequest) -> Bool {
|
||
let requestedOffset = Int64(dataRequest.requestedOffset)
|
||
let requestedLength = dataRequest.requestedLength
|
||
let currentOffset = Int64(dataRequest.currentOffset)
|
||
// 需要构建一个包含请求范围数据的Data对象
|
||
var responseData = Data()
|
||
|
||
// 遍历存储的数据块，查找并拼接满足请求范围的数据块
|
||
// 假设数据块已经按照偏移量升序排序
|
||
for item in (mediaDataBlocks ?? []).sorted(by: { $0.offset < $1.offset }) {
|
||
// 判断当前数据块是否在请求范围内
|
||
if item.offset < currentOffset + Int64(requestedLength) && item.offset + Int64(item.data.count) > currentOffset {
|
||
// 计算数据块在请求范围内的部分，并追加到responseData
|
||
let start = max(currentOffset, item.offset) - item.offset
|
||
let end = min(currentOffset + Int64(requestedLength), item.offset + Int64(item.data.count)) - item.offset
|
||
if start < end { // 确保范围有效
|
||
responseData.append(item.data.subdata(in: Int(start)..<Int(end)))
|
||
}
|
||
}
|
||
}
|
||
// 检查是否成功构建了包含整个请求范围数据的responseData
|
||
if responseData.count >= requestedLength {
|
||
// 使用请求范围内的数据回应dataRequest
|
||
dataRequest.respond(with: responseData)
|
||
return true
|
||
}
|
||
|
||
// 得到的数据长度不满足请求长度，返回false
|
||
return false
|
||
// guard let songDataUnwrapped = mediaData,
|
||
// songDataUnwrapped.count > currentOffset else {
|
||
// return false
|
||
// }
|
||
// let bytesToRespond = min(songDataUnwrapped.count - currentOffset, requestedLength)
|
||
// let dataToRespond = songDataUnwrapped.subdata(in: Range(uncheckedBounds: (currentOffset, currentOffset + bytesToRespond)))
|
||
// dataRequest.respond(with: dataToRespond)
|
||
// return songDataUnwrapped.count >= requestedLength + requestedOffset
|
||
|
||
}
|
||
|
||
deinit {
|
||
NotificationCenter.default.removeObserver(self)
|
||
session?.invalidateAndCancel()
|
||
mediaData = nil
|
||
mediaDataBlocks = nil
|
||
}
|
||
|
||
}
|
||
///媒体数据模型
|
||
struct MediaDataBlock: Codable {
|
||
///数据偏移量
|
||
var offset:Int64
|
||
///数据块内容
|
||
var data:Data
|
||
}
|