import AVFAudio import CoreMedia import Defaults import Foundation import Logging import Repeat import SwiftUI final class MPVBackend: PlayerBackend { static var controlsUpdateInterval = 0.5 static var networkStateUpdateInterval = 0.3 private var logger = Logger(label: "mpv-backend") var model: PlayerModel! var controls: PlayerControlsModel! var playerTime: PlayerTimeModel! var networkState: NetworkStateModel! var stream: Stream? var video: Video? var captions: Captions? { didSet { guard let captions = captions else { client.removeSubs() return } addSubTrack(captions.url) }} var currentTime: CMTime? var loadedVideo = false var isLoadingVideo = true { didSet { DispatchQueue.main.async { [weak self] in guard let self = self else { return } self.controls?.isLoadingVideo = self.isLoadingVideo self.setNeedsNetworkStateUpdates(true) self.model?.objectWillChange.send() } }} var isPlaying = true { didSet { networkStateTimer.start() if isPlaying { self.model.updateAspectRatio() startClientUpdates() } else { stopControlsUpdates() } updateControlsIsPlaying() #if !os(macOS) DispatchQueue.main.async { UIApplication.shared.isIdleTimerDisabled = self.model.presentingPlayer && self.isPlaying } #endif }} var isSeeking = false { didSet { DispatchQueue.main.async { [weak self] in guard let self = self else { return } self.model.isSeeking = self.isSeeking } } } var playerItemDuration: CMTime? #if !os(macOS) var controller: MPVViewController! #endif var client: MPVClient! { didSet { client.backend = self } } private var clientTimer: Repeater! private var networkStateTimer: Repeater! private var onFileLoaded: (() -> Void)? private var controlsUpdates = false private var timeObserverThrottle = Throttle(interval: 2) var tracks: Int { client?.tracksCount ?? -1 } var aspectRatio: Double { client?.aspectRatio ?? VideoPlayerView.defaultAspectRatio } var frameDropCount: Int { client?.frameDropCount ?? 0 } var outputFps: Double { client?.outputFps ?? 0 } var hwDecoder: String { client?.hwDecoder ?? "unknown" } var bufferingState: Double { client?.bufferingState ?? 0 } var cacheDuration: Double { client?.cacheDuration ?? 0 } init( model: PlayerModel, controls: PlayerControlsModel? = nil, playerTime: PlayerTimeModel? = nil, networkState: NetworkStateModel? = nil ) { self.model = model self.controls = controls self.playerTime = playerTime self.networkState = networkState clientTimer = .init(interval: .seconds(Self.controlsUpdateInterval), mode: .infinite) { [weak self] _ in self?.getClientUpdates() } networkStateTimer = .init(interval: .seconds(Self.networkStateUpdateInterval), mode: .infinite) { [weak self] _ in self?.updateNetworkState() } } typealias AreInIncreasingOrder = (Stream, Stream) -> Bool func bestPlayable(_ streams: [Stream], maxResolution: ResolutionSetting) -> Stream? { streams .filter { $0.kind != .hls && $0.resolution <= maxResolution.value } .max { lhs, rhs in let predicates: [AreInIncreasingOrder] = [ { $0.resolution < $1.resolution }, { $0.format > $1.format } ] for predicate in predicates { if !predicate(lhs, rhs), !predicate(rhs, lhs) { continue } return predicate(lhs, rhs) } return false } ?? streams.first { $0.kind == .hls } ?? streams.first } func canPlay(_ stream: Stream) -> Bool { stream.resolution != .unknown && stream.format != .av1 } func playStream(_ stream: Stream, of video: Video, preservingTime: Bool, upgrading _: Bool) { #if !os(macOS) if model.presentingPlayer { UIApplication.shared.isIdleTimerDisabled = true } #endif var captions: Captions? if let captionsLanguageCode = Defaults[.captionsLanguageCode] { captions = video.captions.first { $0.code == captionsLanguageCode } ?? video.captions.first { $0.code.contains(captionsLanguageCode) } } let updateCurrentStream = { DispatchQueue.main.async { [weak self] in self?.stream = stream self?.video = video self?.model.stream = stream self?.captions = captions } } let startPlaying = { #if !os(macOS) try? AVAudioSession.sharedInstance().setActive(true) #endif DispatchQueue.main.async { [weak self] in guard let self = self else { return } self.startClientUpdates() if !preservingTime, let segment = self.model.sponsorBlock.segments.first, self.model.lastSkipped.isNil { self.seek(to: segment.endTime) { finished in guard finished else { return } self.model.lastSkipped = segment self.play() } } else { self.play() } } } let replaceItem: (CMTime?) -> Void = { [weak self] time in guard let self = self else { return } self.stop() DispatchQueue.main.async { [weak self] in guard let self = self else { return } if let url = stream.singleAssetURL { self.onFileLoaded = { updateCurrentStream() startPlaying() } self.client.loadFile(url, sub: captions?.url, time: time) { [weak self] _ in self?.isLoadingVideo = true } } else { self.onFileLoaded = { updateCurrentStream() startPlaying() } let fileToLoad = self.model.musicMode ? stream.audioAsset.url : stream.videoAsset.url let audioTrack = self.model.musicMode ? nil : stream.audioAsset.url self.client?.loadFile(fileToLoad, audio: audioTrack, sub: captions?.url, time: time) { [weak self] _ in self?.isLoadingVideo = true self?.pause() } } } } if preservingTime { if model.preservedTime.isNil { model.saveTime { replaceItem(self.model.preservedTime) } } else { replaceItem(self.model.preservedTime) } } else { replaceItem(nil) } startClientUpdates() } func play() { isPlaying = true startClientUpdates() if controls?.presentingControls ?? false { startControlsUpdates() } setRate(model.currentRate) client?.play() } func pause() { isPlaying = false stopClientUpdates() client?.pause() } func togglePlay() { isPlaying ? pause() : play() } func stop() { client?.stop() } func seek(to time: CMTime, completionHandler: ((Bool) -> Void)?) { client?.seek(to: time) { [weak self] _ in self?.getClientUpdates() self?.updateControls() completionHandler?(true) } } func seek(relative time: CMTime, completionHandler: ((Bool) -> Void)? = nil) { client?.seek(relative: time) { [weak self] _ in self?.getClientUpdates() self?.updateControls() completionHandler?(true) } } func setRate(_ rate: Float) { client?.setDoubleAsync("speed", Double(rate)) } func closeItem() { client?.pause() client?.stop() } func closePiP(wasPlaying _: Bool) {} func updateControls() { guard model.presentingPlayer else { return } DispatchQueue.main.async { [weak self] in guard let self = self else { return } self.playerTime.currentTime = self.currentTime ?? .zero self.playerTime.duration = self.playerItemDuration ?? .zero } } func startControlsUpdates() { self.logger.info("starting controls updates") controlsUpdates = true } func stopControlsUpdates() { self.logger.info("stopping controls updates") controlsUpdates = false } func startClientUpdates() { clientTimer.start() } private var handleSegmentsThrottle = Throttle(interval: 1) private func getClientUpdates() { currentTime = client?.currentTime playerItemDuration = client?.duration if controlsUpdates { updateControls() } model.updateNowPlayingInfo() handleSegmentsThrottle.execute { if let currentTime = currentTime { model.handleSegments(at: currentTime) } } timeObserverThrottle.execute { self.model.updateWatch() } } private func stopClientUpdates() { clientTimer.pause() } private func updateControlsIsPlaying() { DispatchQueue.main.async { [weak self] in self?.controls?.isPlaying = self?.isPlaying ?? false } } func handle(_ event: UnsafePointer!) { logger.info(.init(stringLiteral: "RECEIVED event: \(String(cString: mpv_event_name(event.pointee.event_id)))")) switch event.pointee.event_id { case MPV_EVENT_SHUTDOWN: mpv_destroy(client.mpv) client.mpv = nil case MPV_EVENT_LOG_MESSAGE: let logmsg = UnsafeMutablePointer(OpaquePointer(event.pointee.data)) logger.info(.init(stringLiteral: "\(String(cString: (logmsg!.pointee.prefix)!)), " + "\(String(cString: (logmsg!.pointee.level)!)), " + "\(String(cString: (logmsg!.pointee.text)!))")) case MPV_EVENT_FILE_LOADED: onFileLoaded?() startClientUpdates() onFileLoaded = nil case MPV_EVENT_PLAYBACK_RESTART: isLoadingVideo = false isSeeking = false onFileLoaded?() startClientUpdates() onFileLoaded = nil case MPV_EVENT_PAUSE: DispatchQueue.main.async { [weak self] in self?.handleEndOfFile() } isPlaying = false networkStateTimer.start() case MPV_EVENT_UNPAUSE: isPlaying = true isLoadingVideo = false isSeeking = false networkStateTimer.start() case MPV_EVENT_SEEK: isSeeking = true case MPV_EVENT_END_FILE: DispatchQueue.main.async { [weak self] in self?.handleEndOfFile() } default: logger.info(.init(stringLiteral: "UNHANDLED event: \(String(cString: mpv_event_name(event.pointee.event_id)))")) } } func handleEndOfFile() { guard client.eofReached else { return } getClientUpdates() eofPlaybackModeAction() } func setNeedsDrawing(_ needsDrawing: Bool) { client?.setNeedsDrawing(needsDrawing) } func setSize(_ width: Double, _ height: Double) { client?.setSize(width, height) } func addVideoTrack(_ url: URL) { client?.addVideoTrack(url) } func addSubTrack(_ url: URL) { client?.removeSubs() client?.addSubTrack(url) } func setVideoToAuto() { client?.setVideoToAuto() } func setVideoToNo() { client?.setVideoToNo() } func updateNetworkState() { guard let client = client, let networkState = networkState else { return } DispatchQueue.main.async { networkState.pausedForCache = client.pausedForCache networkState.cacheDuration = client.cacheDuration networkState.bufferingState = client.bufferingState } if !networkState.needsUpdates { networkStateTimer.pause() } } func setNeedsNetworkStateUpdates(_ needsUpdates: Bool) { if needsUpdates { networkStateTimer.start() } else { networkStateTimer.pause() } } }