588 lines
20 KiB
Swift
588 lines
20 KiB
Swift
import Flutter
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import UIKit
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import AVFoundation
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import AVKit
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private let thumbnailHTTPHeaderFieldsKey = "AVURLAssetHTTPHeaderFieldsKey"
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private final class ThumbnailResponseGate {
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private let lock = NSLock()
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private var completed = false
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func send(_ result: @escaping FlutterResult, data: Data?) {
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lock.lock()
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if completed {
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lock.unlock()
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return
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}
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completed = true
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lock.unlock()
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DispatchQueue.main.async {
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result(data)
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}
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}
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}
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/// Keeps the system LaunchScreen as the only splash. Flutter would otherwise
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/// instantiate that storyboard again and the icon appears a second time.
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final class RunnerFlutterViewController: FlutterViewController {
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override func loadDefaultSplashScreenView() -> Bool {
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false
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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view.backgroundColor = .black
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}
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}
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/// iOS 影子播放器：独立 AVPlayer + AVPlayerLayer 专供画中画窗口。
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/// Flutter 的 video_player 走纹理渲染，没有 AVPlayerLayer，无法直接创建
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/// AVPictureInPictureController；小窗的画面与声音由影子接管，退出时把
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/// 影子进度回传给 Dart，由 Flutter 播放器 seek 对齐后继续。
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final class PipShadowCoordinator: NSObject, AVPictureInPictureControllerDelegate {
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static let shared = PipShadowCoordinator()
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private var player: AVPlayer?
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private var playerLayer: AVPlayerLayer?
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private var controller: AVPictureInPictureController?
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private var endObserver: NSObjectProtocol?
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private var possibleObservation: NSKeyValueObservation?
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/// 画中画还原过渡层：原生窗口级红晕渐变，在系统还原动画开始时立即盖上，
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/// 避免回前台瞬间 Flutter 表面未恢复显示黑帧；视频出帧后由 Dart 通知淡出。
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private var restoreOverlay: UIView?
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/// 系统要求 playerLayer 位于真实的 view 层级中才会判定画中画可用，
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/// 因此用 1x1 透明宿主 view 承载，而不是直接挂在 window.layer 上。
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private var hostView: UIView?
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/// 影子图层就绪稍晚于创建，置位后由 KVO 自动拉起画中画。
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private var pendingStart = false
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private var startRetryWorkItems: [DispatchWorkItem] = []
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weak var channel: FlutterMethodChannel?
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/// active 变化回调；停止时把影子最终进度（毫秒）一并提供。
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var onPipChanged: ((Bool, Int64) -> Void)?
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/// 影子在画中画里播完当前集。
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var onPlaybackEnded: (() -> Void)?
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static var isSupported: Bool {
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AVPictureInPictureController.isPictureInPictureSupported()
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}
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private var keyWindow: UIWindow? {
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UIApplication.shared.connectedScenes
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.compactMap { $0 as? UIWindowScene }
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.flatMap { $0.windows }
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.first { $0.isKeyWindow }
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}
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/// 首次创建影子：1x1 图层挂在 keyWindow 的宿主 view 里（肉眼不可见），静音待命。
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/// [autoEnter] 为 true 时退后台由系统自动拉起画中画（需影子在播，见 armAutoEnter）。
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func prepare(urlString: String, positionMs: Int64, autoEnter: Bool) {
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teardown()
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log("prepare begin supported=\(PipShadowCoordinator.isSupported) autoEnter=\(autoEnter)")
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guard Self.isSupported else { return }
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guard let url = URL(string: urlString) else {
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log("prepare failed bad url \(urlString)")
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return
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}
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guard let window = keyWindow else {
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log("prepare failed no key window")
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return
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}
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let item = AVPlayerItem(url: url)
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let p = AVPlayer(playerItem: item)
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p.isMuted = true
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p.actionAtItemEnd = .pause
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let layer = AVPlayerLayer()
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layer.player = p
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let host = UIView(frame: CGRect(x: 0, y: 0, width: 1, height: 1))
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host.isUserInteractionEnabled = false
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host.backgroundColor = .clear
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window.addSubview(host)
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layer.frame = host.bounds
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host.layer.addSublayer(layer)
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hostView = host
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guard let c = AVPictureInPictureController(playerLayer: layer) else {
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p.pause()
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log("prepare failed no pip controller")
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return
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}
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c.canStartPictureInPictureAutomaticallyFromInline = autoEnter
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c.delegate = self
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player = p
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playerLayer = layer
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controller = c
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// 静音起播让 item 完成首帧解码，isPictureInPicturePossible 才会变 true。
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p.play()
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possibleObservation = c.observe(
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\.isPictureInPicturePossible,
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options: [.new, .initial]
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) { [weak self] controller, change in
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let value = change.newValue ?? controller.isPictureInPicturePossible
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self?.log("possible changed to \(value)")
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guard let self, self.pendingStart, controller.isPictureInPicturePossible else { return }
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self.pendingStart = false
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// 刚翻 true 的同一 runloop 里调用会被系统静默拒绝，推到下一拍再进。
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DispatchQueue.main.async {
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guard self.controller === controller, controller.isPictureInPicturePossible else {
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self.log("start via kvo aborted (shadow replaced)")
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return
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}
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self.log("start via kvo")
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controller.startPictureInPicture()
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}
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}
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log("shadow ready, seeking to \(positionMs)ms")
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if positionMs > 0 {
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p.seek(
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to: CMTime(value: positionMs, timescale: 1000),
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toleranceBefore: .zero,
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toleranceAfter: .zero
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)
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}
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registerEndObserver(for: item)
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activateAudioSession()
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}
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/// 退出 App 前（inactive）把影子对齐到当前进度并静音起播：
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/// auto PiP 只在「player 正在播放 + 图层离屏」时由系统触发。
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func armAutoEnter(positionMs: Int64) {
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guard let player, let controller else {
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log("arm failed, shadow missing")
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return
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}
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guard controller.canStartPictureInPictureAutomaticallyFromInline else {
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log("arm failed, autoEnter disabled on shadow")
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return
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}
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log("arm auto enter at \(positionMs)ms")
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if positionMs > 0 {
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player.seek(
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to: CMTime(value: positionMs, timescale: 1000),
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toleranceBefore: CMTime(value: 800, timescale: 1000),
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toleranceAfter: CMTime(value: 800, timescale: 1000)
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)
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}
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player.play()
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}
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/// 回前台后取消待命：影子暂停回静音，等待下一次退后台。
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func disarmAutoEnter() {
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guard let player else { return }
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log("disarm auto enter")
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player.pause()
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player.isMuted = true
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}
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/// 进入画中画：图层就绪则立即进入，否则 KVO/延时重试在就绪后自动进入。
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/// 仅当影子从未创建成功（prepare 失败）时返回 false。
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func start() -> Bool {
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guard let controller else {
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log("start failed, shadow not created")
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return false
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}
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log("start requested possible=\(controller.isPictureInPicturePossible)")
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pendingStart = true
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if controller.isPictureInPicturePossible {
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pendingStart = false
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controller.startPictureInPicture()
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}
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scheduleStartRetries()
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return true
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}
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/// KVO 偶发不触发或流加载较慢时兜底：就绪后再试两次。
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private func scheduleStartRetries() {
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startRetryWorkItems.forEach { $0.cancel() }
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startRetryWorkItems.removeAll()
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for delay in [1.0, 2.5] {
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let item = DispatchWorkItem { [weak self] in
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guard
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let self,
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self.pendingStart,
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let controller = self.controller,
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controller.isPictureInPicturePossible
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else { return }
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self.log("start via retry after \(delay)s")
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self.pendingStart = false
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controller.startPictureInPicture()
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}
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startRetryWorkItems.append(item)
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DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: item)
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}
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}
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/// 画中画内换集：只换 AVPlayerItem，不动 player/layer，窗口不中断。
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func replaceItem(urlString: String, positionMs: Int64) {
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guard let player, let url = URL(string: urlString) else { return }
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let item = AVPlayerItem(url: url)
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player.replaceCurrentItem(with: item)
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registerEndObserver(for: item)
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if positionMs > 0 {
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player.seek(
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to: CMTime(value: positionMs, timescale: 1000),
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toleranceBefore: .zero,
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toleranceAfter: .zero
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)
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}
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}
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/// 进入画中画后解除静音并起播（此时 Flutter 播放器已被暂停）。
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func unmuteAndPlay() {
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player?.isMuted = false
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player?.play()
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}
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func positionMs() -> Int64 {
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Int64(max(0, player?.currentTime().seconds ?? 0) * 1000)
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}
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func stopPip() {
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controller?.stopPictureInPicture()
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}
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func teardown() {
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startRetryWorkItems.forEach { $0.cancel() }
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startRetryWorkItems.removeAll()
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possibleObservation?.invalidate()
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possibleObservation = nil
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pendingStart = false
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if let endObserver {
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NotificationCenter.default.removeObserver(endObserver)
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}
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endObserver = nil
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player?.pause()
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player?.replaceCurrentItem(with: nil)
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playerLayer?.removeFromSuperlayer()
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playerLayer = nil
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hostView?.removeFromSuperview()
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hostView = nil
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controller?.delegate = nil
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controller = nil
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player = nil
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}
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/// 诊断日志：NSLog 之外同步转发到 Dart，便于在 flutter run 控制台观察。
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private func log(_ message: String) {
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NSLog("pip: %@", message)
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channel?.invokeMethod("pipDebug", arguments: message)
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}
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private func registerEndObserver(for item: AVPlayerItem) {
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if let endObserver {
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NotificationCenter.default.removeObserver(endObserver)
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}
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endObserver = NotificationCenter.default.addObserver(
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forName: .AVPlayerItemDidPlayToEndTime,
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object: item,
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queue: .main
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) { [weak self] _ in
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self?.log("item did play to end")
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self?.onPlaybackEnded?()
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}
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}
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/// 画中画的声音走影子播放器，需要 playback 类别的音频会话保活。
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private func activateAudioSession() {
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do {
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try AVAudioSession.sharedInstance().setCategory(.playback, mode: .moviePlayback)
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try AVAudioSession.sharedInstance().setActive(true)
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} catch {
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// 会话激活失败只影响后台出声，不阻断画中画。
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}
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}
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func pictureInPictureControllerWillStartPictureInPicture(
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_ pictureInPictureController: AVPictureInPictureController
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) {
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log("will start")
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pendingStart = false
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onPipChanged?(true, 0)
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}
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func pictureInPictureControllerWillStopPictureInPicture(
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_ pictureInPictureController: AVPictureInPictureController
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) {
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log("will stop, showing restore overlay")
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showRestoreOverlay()
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}
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func pictureInPictureControllerDidStopPictureInPicture(
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_ pictureInPictureController: AVPictureInPictureController
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) {
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log("did stop")
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showRestoreOverlay()
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onPipChanged?(false, positionMs())
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}
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/// 盖原生过渡层（幂等）：主题红晕渐变，不依赖 Flutter 渲染。
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func showRestoreOverlay() {
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guard let window = keyWindow else { return }
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restoreOverlay?.removeFromSuperview()
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let overlay = UIView(frame: window.bounds)
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overlay.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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let gradient = CAGradientLayer()
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gradient.frame = overlay.bounds
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gradient.colors = [
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UIColor(red: 0.298, green: 0.086, blue: 0.102, alpha: 1).cgColor,
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UIColor(red: 0.118, green: 0.043, blue: 0.047, alpha: 1).cgColor,
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UIColor(red: 0.063, green: 0.063, blue: 0.071, alpha: 1).cgColor,
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]
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gradient.locations = [0, 0.22, 0.62]
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gradient.startPoint = CGPoint(x: 0.5, y: 0)
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gradient.endPoint = CGPoint(x: 0.5, y: 1)
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overlay.layer.addSublayer(gradient)
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window.addSubview(overlay)
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restoreOverlay = overlay
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}
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/// 淡出并移除过渡层（视频首帧已确认后由 Dart 调用）。
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func hideRestoreOverlay() {
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guard let overlay = restoreOverlay else { return }
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restoreOverlay = nil
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UIView.animate(
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withDuration: 0.25,
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animations: { overlay.alpha = 0 }
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) { _ in overlay.removeFromSuperview() }
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}
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}
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@main
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@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
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private let wirelessDataPrompt = WirelessDataPrompt()
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private let thumbnailQueue = DispatchQueue(
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label: "com.stormg.lumadrama.thumbnail",
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qos: .userInitiated
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)
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override func application(
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_ application: UIApplication,
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didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
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) -> Bool {
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UIApplication.shared.isIdleTimerDisabled = true
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return super.application(application, didFinishLaunchingWithOptions: launchOptions)
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}
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override func applicationDidBecomeActive(_ application: UIApplication) {
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super.applicationDidBecomeActive(application)
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requestWirelessDataPrompt()
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}
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func requestWirelessDataPrompt() {
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wirelessDataPrompt.requestSystemPrompt()
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}
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func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
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GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
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registerWirelessDataChannel(engineBridge)
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registerDeviceIdChannel(engineBridge)
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registerPipChannel(engineBridge)
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let channel = FlutterMethodChannel(
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name: "com.stormg.lumadrama/share",
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binaryMessenger: engineBridge.applicationRegistrar.messenger()
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)
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channel.setMethodCallHandler { [weak self] call, result in
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guard call.method == "shareText",
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let arguments = call.arguments as? [String: Any],
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let text = arguments["text"] as? String,
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!text.isEmpty,
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let controller = self?.window?.rootViewController else {
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result(FlutterError(code: "share_unavailable", message: "Share sheet is unavailable", details: nil))
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return
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}
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let activity = UIActivityViewController(activityItems: [text], applicationActivities: nil)
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activity.popoverPresentationController?.sourceView = controller.view
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activity.completionWithItemsHandler = { _, _, _, _ in result(nil) }
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controller.present(activity, animated: true)
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}
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let thumbnailChannel = FlutterMethodChannel(
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name: "com.stormg.lumadrama/thumbnail",
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binaryMessenger: engineBridge.applicationRegistrar.messenger()
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)
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thumbnailChannel.setMethodCallHandler { [weak self] call, result in
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guard call.method == "frame" else {
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result(FlutterMethodNotImplemented)
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return
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}
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guard let self,
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let arguments = call.arguments as? [String: Any],
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let timeNumber = arguments["timeMs"] as? NSNumber else {
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result(nil)
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return
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}
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let localPath = arguments["localPath"] as? String ?? ""
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let remoteUrl = arguments["url"] as? String ?? ""
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let headers = arguments["headers"] as? [String: String] ?? [:]
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let assetUrl: URL?
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if !localPath.isEmpty {
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assetUrl = localPath.hasPrefix("file:")
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? URL(string: localPath)
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: URL(fileURLWithPath: localPath)
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} else if !remoteUrl.isEmpty {
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assetUrl = URL(string: remoteUrl)
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} else {
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assetUrl = nil
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}
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guard let assetUrl else {
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result(nil)
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return
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}
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let options: [String: Any]? = headers.isEmpty
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? nil
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: [thumbnailHTTPHeaderFieldsKey: headers]
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let asset = AVURLAsset(url: assetUrl, options: options)
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let generator = AVAssetImageGenerator(asset: asset)
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generator.appliesPreferredTrackTransform = true
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generator.maximumSize = CGSize(width: 240, height: 426)
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generator.requestedTimeToleranceBefore = CMTime(seconds: 0.5, preferredTimescale: 600)
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generator.requestedTimeToleranceAfter = CMTime(seconds: 0.5, preferredTimescale: 600)
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let time = CMTime(value: timeNumber.int64Value, timescale: 1000)
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let gate = ThumbnailResponseGate()
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self.thumbnailQueue.async {
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do {
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let image = try generator.copyCGImage(at: time, actualTime: nil)
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let data = UIImage(cgImage: image).jpegData(compressionQuality: 0.7)
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gate.send(result, data: data)
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} catch {
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gate.send(result, data: nil)
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}
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}
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DispatchQueue.global(qos: .userInitiated).asyncAfter(
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deadline: .now() + 1.5
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) {
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gate.send(result, data: nil)
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}
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}
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}
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/// iOS 画中画：影子播放器通道，与 Android 共用同一 channel 名。
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private func registerPipChannel(_ engineBridge: FlutterImplicitEngineBridge) {
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let channel = FlutterMethodChannel(
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name: "com.stormg.lumadrama/pip",
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binaryMessenger: engineBridge.applicationRegistrar.messenger()
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)
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let pip = PipShadowCoordinator.shared
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pip.channel = channel
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channel.setMethodCallHandler { call, result in
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switch call.method {
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case "isAvailable":
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result(PipShadowCoordinator.isSupported)
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case "enter":
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guard let args = call.arguments as? [String: Any],
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let url = args["url"] as? String else {
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result(false)
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return
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}
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let positionMs = (args["positionMs"] as? NSNumber)?.int64Value ?? 0
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pip.prepare(urlString: url, positionMs: positionMs, autoEnter: false)
|
|
// 等一拍让 AVPlayerLayer 完成挂载再请求进入画中画。
|
|
DispatchQueue.main.async {
|
|
result(pip.start())
|
|
}
|
|
case "prepareShadow":
|
|
guard let args = call.arguments as? [String: Any],
|
|
let url = args["url"] as? String else {
|
|
result(nil)
|
|
return
|
|
}
|
|
pip.prepare(
|
|
urlString: url,
|
|
positionMs: (args["positionMs"] as? NSNumber)?.int64Value ?? 0,
|
|
autoEnter: (args["autoEnter"] as? NSNumber)?.boolValue ?? false
|
|
)
|
|
result(nil)
|
|
case "armAutoEnter":
|
|
pip.armAutoEnter(
|
|
positionMs: (call.arguments as? [String: Any])?["positionMs"] as? Int64 ?? 0
|
|
)
|
|
result(nil)
|
|
case "showRestoreOverlay":
|
|
pip.showRestoreOverlay()
|
|
result(nil)
|
|
case "hideRestoreOverlay":
|
|
pip.hideRestoreOverlay()
|
|
result(nil)
|
|
case "disarmAutoEnter":
|
|
pip.disarmAutoEnter()
|
|
result(nil)
|
|
case "unmute":
|
|
pip.unmuteAndPlay()
|
|
result(nil)
|
|
case "replaceItem":
|
|
guard let args = call.arguments as? [String: Any],
|
|
let url = args["url"] as? String else {
|
|
result(nil)
|
|
return
|
|
}
|
|
pip.replaceItem(
|
|
urlString: url,
|
|
positionMs: (args["positionMs"] as? NSNumber)?.int64Value ?? 0
|
|
)
|
|
result(nil)
|
|
case "stop":
|
|
pip.stopPip()
|
|
result(nil)
|
|
case "teardown":
|
|
pip.teardown()
|
|
result(nil)
|
|
default:
|
|
result(FlutterMethodNotImplemented)
|
|
}
|
|
}
|
|
pip.onPipChanged = { active, positionMs in
|
|
channel.invokeMethod(
|
|
"onPipChanged",
|
|
arguments: ["active": active, "positionMs": positionMs]
|
|
)
|
|
}
|
|
pip.onPlaybackEnded = {
|
|
channel.invokeMethod("onPipPlaybackEnded", arguments: nil)
|
|
}
|
|
}
|
|
|
|
/// 设备标识：IDFV 免权限，卸载本 App 不变，避免客户端自生成的 id 每次重装都变。
|
|
/// 同通道顺带提供设备区域（ISO-2），注册时作为服务端 IP 解析失败后的兜底。
|
|
private func registerDeviceIdChannel(_ engineBridge: FlutterImplicitEngineBridge) {
|
|
let channel = FlutterMethodChannel(
|
|
name: "com.stormg.lumadrama/device",
|
|
binaryMessenger: engineBridge.applicationRegistrar.messenger()
|
|
)
|
|
channel.setMethodCallHandler { call, result in
|
|
switch call.method {
|
|
case "idfv":
|
|
result(UIDevice.current.identifierForVendor?.uuidString)
|
|
case "region":
|
|
if #available(iOS 16.0, *) {
|
|
result(Locale.current.region?.identifier)
|
|
} else {
|
|
result(Locale.current.regionCode)
|
|
}
|
|
default:
|
|
result(FlutterMethodNotImplemented)
|
|
}
|
|
}
|
|
}
|
|
|
|
private func registerWirelessDataChannel(_ engineBridge: FlutterImplicitEngineBridge) {
|
|
let channel = FlutterMethodChannel(
|
|
name: WirelessDataPrompt.channelName,
|
|
binaryMessenger: engineBridge.applicationRegistrar.messenger()
|
|
)
|
|
channel.setMethodCallHandler { [weak self] call, result in
|
|
guard call.method == WirelessDataPrompt.awaitDecisionMethod else {
|
|
result(FlutterMethodNotImplemented)
|
|
return
|
|
}
|
|
guard let self else {
|
|
result(nil)
|
|
return
|
|
}
|
|
self.wirelessDataPrompt.awaitDecision(result)
|
|
}
|
|
}
|
|
}
|