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https://github.com/dirtydishes/dreamio.git
synced 2026-06-06 13:37:24 +00:00
616 lines
21 KiB
Swift
616 lines
21 KiB
Swift
import UIKit
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#if canImport(MobileVLCKit)
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import MobileVLCKit
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#endif
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final class VLCNativePlaybackBackend: NSObject, NativePlaybackBackend {
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private static let seekBufferMilliseconds = 30_000
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private static let stalledJumpRecoveryDelay: TimeInterval = 3.0
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private static let stalledJumpProgressTolerance: TimeInterval = 0.75
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private static let stalledJumpTargetTolerance: TimeInterval = 2.0
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static var isAvailable: Bool {
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#if canImport(MobileVLCKit)
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true
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#else
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false
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#endif
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}
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let view = UIView()
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var onReady: (() -> Void)?
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var onFailure: ((Error) -> Void)?
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var onStateChange: (() -> Void)?
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var onSubtitleTracksChange: (() -> Void)?
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var onAudioTracksChange: (() -> Void)?
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#if canImport(MobileVLCKit)
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private let mediaPlayer = VLCMediaPlayer()
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private var currentRequest: NativePlaybackRequest?
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private var recoveryGeneration = 0
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#endif
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private var attachedSubtitleURLs = Set<URL>()
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private var attachedSubtitleCandidates: [SubtitleCandidate] = []
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private var didAutoSelectSubtitleTrack = false
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private var didUserSelectSubtitleTrack = false
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private var autoSelectedSubtitleTrackID: Int32?
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private var externalSubtitleBaselineTrackIDs = Set<Int32>()
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private var hasPendingExternalSubtitleSelection = false
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private var pendingExternalSubtitleDisplayNames: [String] = []
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private var externalSubtitleDisplayNamesByTrackID: [Int32: String] = [:]
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override init() {
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super.init()
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#if canImport(MobileVLCKit)
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mediaPlayer.delegate = self
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#endif
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view.backgroundColor = .black
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}
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func prepare(in viewController: UIViewController) {
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#if canImport(MobileVLCKit)
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mediaPlayer.drawable = view
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#endif
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}
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func play(request: NativePlaybackRequest) {
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#if canImport(MobileVLCKit)
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currentRequest = request
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recoveryGeneration += 1
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attachedSubtitleURLs.removeAll()
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attachedSubtitleCandidates.removeAll()
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didAutoSelectSubtitleTrack = false
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didUserSelectSubtitleTrack = false
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autoSelectedSubtitleTrackID = nil
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externalSubtitleBaselineTrackIDs.removeAll()
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hasPendingExternalSubtitleSelection = false
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pendingExternalSubtitleDisplayNames.removeAll()
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externalSubtitleDisplayNamesByTrackID.removeAll()
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mediaPlayer.media = configuredMedia(for: request)
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#if DEBUG
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print("[DreamioVLC] opening url=\(URLRedactor.redactedURLString(request.playbackURL.absoluteString)) seekBufferMilliseconds=\(Self.seekBufferMilliseconds)")
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#endif
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mediaPlayer.play()
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#else
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onFailure?(NativePlaybackError.backendUnavailable)
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#endif
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}
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func play() {
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#if canImport(MobileVLCKit)
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mediaPlayer.play()
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#endif
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}
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#if canImport(MobileVLCKit)
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private func configureSeekBuffer(for media: VLCMedia) {
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let cachingOptions = [
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":network-caching=\(Self.seekBufferMilliseconds)",
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":http-caching=\(Self.seekBufferMilliseconds)",
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":file-caching=\(Self.seekBufferMilliseconds)",
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":live-caching=\(Self.seekBufferMilliseconds)",
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":input-fast-seek"
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]
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cachingOptions.forEach { media.addOption($0) }
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}
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private func configuredMedia(for request: NativePlaybackRequest, startTime: TimeInterval? = nil) -> VLCMedia {
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let media = VLCMedia(url: request.playbackURL)
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let headerValue = request.headers
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.map { "\($0.key): \($0.value)" }
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.joined(separator: "\r\n")
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media.addOption(":http-referrer=\(request.referer)")
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if let userAgent = request.userAgent {
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media.addOption(":http-user-agent=\(userAgent)")
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}
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if !headerValue.isEmpty {
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media.addOption(":http-header=\(headerValue)")
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}
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if let startTime {
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media.addOption(":start-time=\(Int(startTime.rounded()))")
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}
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configureSeekBuffer(for: media)
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return media
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}
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#endif
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func pause() {
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#if canImport(MobileVLCKit)
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mediaPlayer.pause()
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#endif
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}
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func togglePlayPause() {
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isPlaying ? pause() : play()
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}
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func seek(to position: Float) {
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#if canImport(MobileVLCKit)
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guard isSeekable else {
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return
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}
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let nextPosition = max(0, min(1, position))
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#if DEBUG
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print("[DreamioVLC] seek position from=\(mediaPlayer.position) to=\(nextPosition) currentTime=\(currentTime) duration=\(duration)")
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#endif
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mediaPlayer.position = nextPosition
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#endif
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}
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func jump(by seconds: TimeInterval) {
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#if canImport(MobileVLCKit)
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guard isSeekable else {
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return
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}
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let nextTime = max(0, min(duration, currentTime + seconds))
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#if DEBUG
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print("[DreamioVLC] jump seconds=\(seconds) from=\(currentTime) to=\(nextTime) duration=\(duration) seekBufferMilliseconds=\(Self.seekBufferMilliseconds)")
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#endif
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guard duration > 0 else {
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return
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}
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mediaPlayer.position = Float(nextTime / duration)
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mediaPlayer.play()
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scheduleStalledJumpRecovery(from: currentTime, targetTime: nextTime)
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#if DEBUG
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schedulePostSeekDiagnostics(label: "jump", expectedTime: nextTime)
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#endif
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#endif
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}
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func selectAudioTrack(id: Int32) {
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#if canImport(MobileVLCKit)
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#if DEBUG
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logAudioTracks(reason: "before-select-\(id)")
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#endif
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mediaPlayer.currentAudioTrackIndex = id
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#if DEBUG
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logAudioTracks(reason: "after-select-\(id)")
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#endif
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onAudioTracksChange?()
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#endif
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}
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func selectSubtitleTrack(id: Int32) {
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#if canImport(MobileVLCKit)
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didUserSelectSubtitleTrack = true
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autoSelectedSubtitleTrackID = nil
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#if DEBUG
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logSubtitleTracks(reason: "before-select-\(id)")
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#endif
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mediaPlayer.currentVideoSubTitleIndex = id
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#if DEBUG
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logSubtitleTracks(reason: "after-select-\(id)")
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#endif
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onSubtitleTracksChange?()
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#endif
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}
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func adjustSubtitleDelay(by seconds: TimeInterval) {
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#if canImport(MobileVLCKit)
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#if DEBUG
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print("[DreamioVLC] subtitle delay before=\(subtitleDelay) delta=\(seconds)")
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#endif
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mediaPlayer.currentVideoSubTitleDelay += Int(seconds * 1_000_000)
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#if DEBUG
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print("[DreamioVLC] subtitle delay after=\(subtitleDelay)")
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#endif
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onSubtitleTracksChange?()
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#endif
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}
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@discardableResult
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func addSubtitleCandidates(_ candidates: [SubtitleCandidate]) -> Int {
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#if canImport(MobileVLCKit)
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return attachSubtitles(candidates)
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#else
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return 0
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#endif
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}
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func stop() {
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#if canImport(MobileVLCKit)
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mediaPlayer.stop()
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mediaPlayer.drawable = nil
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mediaPlayer.media = nil
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currentRequest = nil
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recoveryGeneration += 1
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#endif
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}
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var isPlaying: Bool {
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#if canImport(MobileVLCKit)
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mediaPlayer.isPlaying
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#else
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false
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#endif
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}
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var isSeekable: Bool {
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#if canImport(MobileVLCKit)
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mediaPlayer.isSeekable
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#else
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false
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#endif
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}
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var duration: TimeInterval {
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#if canImport(MobileVLCKit)
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TimeInterval(max(0, mediaPlayer.media?.length.intValue ?? 0)) / 1000
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#else
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0
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#endif
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}
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var currentTime: TimeInterval {
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#if canImport(MobileVLCKit)
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TimeInterval(max(0, mediaPlayer.time.intValue)) / 1000
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#else
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0
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#endif
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}
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var remainingTime: TimeInterval {
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max(0, duration - currentTime)
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}
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var position: Float {
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#if canImport(MobileVLCKit)
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mediaPlayer.position
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#else
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0
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#endif
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}
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var audioTracks: [AudioTrack] {
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#if canImport(MobileVLCKit)
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let names = mediaPlayer.audioTrackNames as? [String] ?? []
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let indexes = mediaPlayer.audioTrackIndexes as? [NSNumber] ?? []
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return zip(indexes, names).map { index, name in
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AudioTrack(id: index.int32Value, name: name)
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}
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#else
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[]
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#endif
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}
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var selectedAudioTrackID: Int32 {
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#if canImport(MobileVLCKit)
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mediaPlayer.currentAudioTrackIndex
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#else
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-1
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#endif
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}
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var subtitleTracks: [SubtitleTrack] {
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#if canImport(MobileVLCKit)
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reconcileExternalSubtitleDisplayNames()
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return rawSubtitleTracks().map { track in
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SubtitleTrack(
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id: track.id,
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name: SubtitleDisplayName.name(
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forVLCTrackName: track.name,
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preservedName: externalSubtitleDisplayNamesByTrackID[track.id]
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)
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)
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}
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#else
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[]
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#endif
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}
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var selectedSubtitleTrackID: Int32 {
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#if canImport(MobileVLCKit)
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mediaPlayer.currentVideoSubTitleIndex
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#else
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-1
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#endif
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}
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var subtitleDelay: TimeInterval {
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#if canImport(MobileVLCKit)
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TimeInterval(mediaPlayer.currentVideoSubTitleDelay) / 1_000_000
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#else
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0
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#endif
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}
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#if canImport(MobileVLCKit)
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private func attachSubtitles(_ candidates: [SubtitleCandidate]) -> Int {
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var attachedCount = 0
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var duplicateCount = 0
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let baselineTrackIDs = Set(rawSubtitleTracks().filter { $0.id >= 0 }.map(\.id))
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candidates.forEach { candidate in
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guard !attachedSubtitleURLs.contains(candidate.url) else {
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duplicateCount += 1
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return
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}
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attachedSubtitleURLs.insert(candidate.url)
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attachedSubtitleCandidates.append(candidate)
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externalSubtitleBaselineTrackIDs.formUnion(baselineTrackIDs)
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hasPendingExternalSubtitleSelection = true
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pendingExternalSubtitleDisplayNames.append(SubtitleDisplayName.displayName(for: candidate))
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mediaPlayer.addPlaybackSlave(candidate.url, type: .subtitle, enforce: false)
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attachedCount += 1
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#if DEBUG
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print("[DreamioVLC] attach accepted subtitle=\(URLRedactor.redactedURLString(candidate.url.absoluteString)) label=\(candidate.label) language=\(candidate.language ?? "unknown") ext=\(candidate.url.pathExtension.lowercased()) visibleBefore=\(baselineTrackIDs.count)")
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logSubtitleTracks(reason: "after-addPlaybackSlave")
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#endif
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}
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#if DEBUG
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if !candidates.isEmpty {
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print("[DreamioVLC] subtitle candidates=\(candidates.count) attached=\(attachedCount) duplicates=\(duplicateCount) visible=\(subtitleTracks.filter { $0.id >= 0 }.count)")
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}
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#endif
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guard attachedCount > 0 else {
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return attachedCount
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}
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[0.2, 0.6, 1.0, 2.0, 4.0].forEach { delay in
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
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self?.selectPreferredSubtitleTrackIfNeeded(reason: "delayed-refresh-\(String(format: "%.1f", delay))")
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#if DEBUG
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self?.logSubtitleTracks(reason: "delayed-refresh-\(String(format: "%.1f", delay))")
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if delay == 4.0 {
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self?.logMissingExternalSubtitleTrackIfNeeded()
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}
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#endif
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self?.onSubtitleTracksChange?()
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}
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}
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return attachedCount
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}
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private func rawSubtitleTracks() -> [SubtitleTrack] {
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let names = mediaPlayer.videoSubTitlesNames as? [String] ?? []
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let indexes = mediaPlayer.videoSubTitlesIndexes as? [NSNumber] ?? []
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return zip(indexes, names).map { index, name in
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SubtitleTrack(id: index.int32Value, name: name)
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}
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}
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private func reconcileExternalSubtitleDisplayNames() {
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guard !pendingExternalSubtitleDisplayNames.isEmpty else {
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return
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}
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rawSubtitleTracks()
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.filter { $0.id >= 0 }
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.filter { !externalSubtitleBaselineTrackIDs.contains($0.id) }
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.filter { externalSubtitleDisplayNamesByTrackID[$0.id] == nil }
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.filter { SubtitleDisplayName.isGenericLabel($0.name) }
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.sorted { $0.id < $1.id }
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.forEach { track in
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guard !pendingExternalSubtitleDisplayNames.isEmpty else {
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return
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}
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externalSubtitleDisplayNamesByTrackID[track.id] = pendingExternalSubtitleDisplayNames.removeFirst()
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}
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}
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private func scheduleStalledJumpRecovery(from originalTime: TimeInterval, targetTime: TimeInterval) {
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recoveryGeneration += 1
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let generation = recoveryGeneration
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DispatchQueue.main.asyncAfter(deadline: .now() + Self.stalledJumpRecoveryDelay) { [weak self] in
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self?.recoverStalledJumpIfNeeded(
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generation: generation,
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originalTime: originalTime,
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targetTime: targetTime
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)
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}
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}
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private func recoverStalledJumpIfNeeded(
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generation: Int,
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originalTime: TimeInterval,
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targetTime: TimeInterval
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) {
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guard generation == recoveryGeneration,
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let request = currentRequest,
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mediaPlayer.state == .buffering else {
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return
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}
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let hasMadeProgress = abs(currentTime - originalTime) > Self.stalledJumpProgressTolerance
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let hasReachedTarget = abs(currentTime - targetTime) <= Self.stalledJumpTargetTolerance
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guard !hasMadeProgress && !hasReachedTarget else {
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return
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}
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let subtitleCandidates = attachedSubtitleCandidates
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let selectedAudioTrackID = mediaPlayer.currentAudioTrackIndex
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let selectedSubtitleTrackID = mediaPlayer.currentVideoSubTitleIndex
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let wasUserSubtitleSelection = didUserSelectSubtitleTrack
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#if DEBUG
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print("[DreamioVLC] stalled jump recovery target=\(targetTime) original=\(originalTime) current=\(currentTime) position=\(mediaPlayer.position)")
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#endif
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recoveryGeneration += 1
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attachedSubtitleURLs.removeAll()
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attachedSubtitleCandidates.removeAll()
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externalSubtitleBaselineTrackIDs.removeAll()
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hasPendingExternalSubtitleSelection = false
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pendingExternalSubtitleDisplayNames.removeAll()
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externalSubtitleDisplayNamesByTrackID.removeAll()
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didUserSelectSubtitleTrack = wasUserSubtitleSelection
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mediaPlayer.stop()
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mediaPlayer.media = configuredMedia(for: request, startTime: targetTime)
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mediaPlayer.play()
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_ = attachSubtitles(subtitleCandidates)
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scheduleTrackRecovery(audioTrackID: selectedAudioTrackID, subtitleTrackID: selectedSubtitleTrackID)
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}
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private func scheduleTrackRecovery(audioTrackID: Int32, subtitleTrackID: Int32) {
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[0.4, 1.2, 2.5].forEach { delay in
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
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guard let self else {
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return
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}
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if audioTrackID >= 0,
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self.audioTracks.contains(where: { $0.id == audioTrackID }) {
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self.mediaPlayer.currentAudioTrackIndex = audioTrackID
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}
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if subtitleTrackID >= 0,
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self.subtitleTracks.contains(where: { $0.id == subtitleTrackID }) {
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self.mediaPlayer.currentVideoSubTitleIndex = subtitleTrackID
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}
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self.onAudioTracksChange?()
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self.onSubtitleTracksChange?()
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}
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}
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}
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#if DEBUG
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private func logPlaybackSnapshot(reason: String) {
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print("[DreamioVLC] snapshot reason=\(reason) state=\(stateName(mediaPlayer.state)) isPlaying=\(mediaPlayer.isPlaying) isSeekable=\(mediaPlayer.isSeekable) time=\(currentTime) duration=\(duration) position=\(mediaPlayer.position) selectedAudio=\(mediaPlayer.currentAudioTrackIndex) selectedSubtitle=\(mediaPlayer.currentVideoSubTitleIndex)")
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}
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private func schedulePostSeekDiagnostics(label: String, expectedTime: TimeInterval) {
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[0.25, 1.0, 3.0, 6.0].forEach { delay in
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
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self?.logPlaybackSnapshot(reason: "\(label)-after-\(String(format: "%.2f", delay))s expected=\(String(format: "%.3f", expectedTime))")
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}
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}
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}
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private func logAudioTracks(reason: String) {
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let names = mediaPlayer.audioTrackNames as? [String] ?? []
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let indexes = mediaPlayer.audioTrackIndexes as? [NSNumber] ?? []
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print("[DreamioVLC] audio tracks reason=\(reason) names=\(names) indexes=\(indexes.map { $0.int32Value }) selected=\(mediaPlayer.currentAudioTrackIndex)")
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}
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private func logSubtitleTracks(reason: String) {
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let names = mediaPlayer.videoSubTitlesNames as? [String] ?? []
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let indexes = mediaPlayer.videoSubTitlesIndexes as? [NSNumber] ?? []
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print("[DreamioVLC] subtitle tracks reason=\(reason) names=\(names) indexes=\(indexes.map { $0.int32Value }) selected=\(mediaPlayer.currentVideoSubTitleIndex)")
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}
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#endif
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private func selectPreferredSubtitleTrackIfNeeded(reason: String) {
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guard !didUserSelectSubtitleTrack else {
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return
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}
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if hasPendingExternalSubtitleSelection,
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let externalTrack = subtitleTracks.first(where: { $0.id >= 0 && !externalSubtitleBaselineTrackIDs.contains($0.id) }) {
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selectAutoSubtitleTrack(externalTrack, reason: "\(reason)-external")
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hasPendingExternalSubtitleSelection = false
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return
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}
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guard !didAutoSelectSubtitleTrack,
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mediaPlayer.currentVideoSubTitleIndex < 0,
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let track = subtitleTracks.first(where: { $0.id >= 0 }) else {
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return
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}
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selectAutoSubtitleTrack(track, reason: reason)
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}
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private func selectAutoSubtitleTrack(_ track: SubtitleTrack, reason: String) {
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didAutoSelectSubtitleTrack = true
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autoSelectedSubtitleTrackID = track.id
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#if DEBUG
|
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print("[DreamioVLC] auto-select subtitle id=\(track.id) name=\(track.name) reason=\(reason)")
|
|
#endif
|
|
mediaPlayer.currentVideoSubTitleIndex = track.id
|
|
scheduleAutoSubtitleSelectionReapply(trackID: track.id)
|
|
}
|
|
|
|
#if DEBUG
|
|
private func logMissingExternalSubtitleTrackIfNeeded() {
|
|
guard hasPendingExternalSubtitleSelection else {
|
|
return
|
|
}
|
|
print("[DreamioVLC] attach accepted but no new external subtitle track visible baseline=\(externalSubtitleBaselineTrackIDs.sorted()) visible=\(subtitleTracks.filter { $0.id >= 0 }.map(\.id))")
|
|
}
|
|
#endif
|
|
|
|
private func scheduleAutoSubtitleSelectionReapply(trackID: Int32) {
|
|
[0.3, 1.0, 2.0, 4.0].forEach { delay in
|
|
DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
|
|
self?.reapplyAutoSelectedSubtitleTrackIfNeeded(
|
|
reason: "delayed-\(String(format: "%.1f", delay))",
|
|
shouldLogNoop: true
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
private func reapplyAutoSelectedSubtitleTrackIfNeeded(reason: String, shouldLogNoop: Bool = false) {
|
|
guard !didUserSelectSubtitleTrack,
|
|
let trackID = autoSelectedSubtitleTrackID,
|
|
subtitleTracks.contains(where: { $0.id == trackID }) else {
|
|
return
|
|
}
|
|
|
|
let selectedTrackID = mediaPlayer.currentVideoSubTitleIndex
|
|
guard selectedTrackID < 0 || (selectedTrackID == trackID && shouldLogNoop) else {
|
|
return
|
|
}
|
|
|
|
if selectedTrackID < 0 {
|
|
mediaPlayer.currentVideoSubTitleIndex = trackID
|
|
}
|
|
#if DEBUG
|
|
let action = selectedTrackID == trackID ? "confirm" : "recover"
|
|
print("[DreamioVLC] reapply subtitle id=\(trackID) reason=\(reason) action=\(action) selected=\(mediaPlayer.currentVideoSubTitleIndex)")
|
|
#endif
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#if canImport(MobileVLCKit)
|
|
extension VLCNativePlaybackBackend: VLCMediaPlayerDelegate {
|
|
func mediaPlayerStateChanged(_ aNotification: Notification) {
|
|
#if DEBUG
|
|
print("[DreamioVLC] state=\(stateName(mediaPlayer.state))")
|
|
logPlaybackSnapshot(reason: "state-\(stateName(mediaPlayer.state))")
|
|
#endif
|
|
switch mediaPlayer.state {
|
|
case .buffering, .playing:
|
|
reapplyAutoSelectedSubtitleTrackIfNeeded(reason: stateName(mediaPlayer.state))
|
|
onReady?()
|
|
onStateChange?()
|
|
onAudioTracksChange?()
|
|
case .error:
|
|
onFailure?(NativePlaybackError.playbackFailed)
|
|
case .paused, .stopped, .ended:
|
|
onStateChange?()
|
|
case .esAdded:
|
|
selectPreferredSubtitleTrackIfNeeded(reason: "esAdded")
|
|
#if DEBUG
|
|
logAudioTracks(reason: "esAdded")
|
|
logSubtitleTracks(reason: "esAdded")
|
|
#endif
|
|
onAudioTracksChange?()
|
|
onSubtitleTracksChange?()
|
|
default:
|
|
break
|
|
}
|
|
}
|
|
|
|
private func stateName(_ state: VLCMediaPlayerState) -> String {
|
|
switch state {
|
|
case .opening:
|
|
return "opening"
|
|
case .buffering:
|
|
return "buffering"
|
|
case .playing:
|
|
return "playing"
|
|
case .ended:
|
|
return "ended"
|
|
case .stopped:
|
|
return "stopped"
|
|
case .error:
|
|
return "error"
|
|
case .paused:
|
|
return "paused"
|
|
case .esAdded:
|
|
return "elementary-stream-added"
|
|
@unknown default:
|
|
return "unknown"
|
|
}
|
|
}
|
|
}
|
|
#endif
|