import AVFAudio import CoreMedia import Foundation import Logging import SwiftUI final class MPVBackend: PlayerBackend { private var logger = Logger(label: "mpv-backend") var model: PlayerModel! var controls: PlayerControlsModel! var stream: Stream? var video: Video? var currentTime: CMTime? var loadedVideo = false var isLoadingVideo = true { didSet { DispatchQueue.main.async { [weak self] in self?.controls.isLoadingVideo = self?.isLoadingVideo ?? true } }} var isPlaying = true { didSet { if isPlaying { startClientUpdates() } else { stopControlsUpdates() } updateControlsIsPlaying() }} var playerItemDuration: CMTime? #if !os(macOS) var controller: MPVViewController! #endif var client: MPVClient! { didSet { client.backend = self } } private var clientTimer: RepeatingTimer! private var onFileLoaded: (() -> Void)? private var controlsUpdates = false private var timeObserverThrottle = Throttle(interval: 2) init(model: PlayerModel, controls: PlayerControlsModel? = nil) { self.model = model self.controls = controls clientTimer = .init(timeInterval: 1) clientTimer.eventHandler = getClientUpdates } func bestPlayable(_ streams: [Stream]) -> Stream? { streams.filter { $0.kind == .adaptive }.max { $0.resolution < $1.resolution } ?? 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) { let updateCurrentStream = { DispatchQueue.main.async { [weak self] in self?.stream = stream self?.video = video self?.model.stream = stream } } 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, segment.start < 3, 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() if let url = stream.singleAssetURL { self.onFileLoaded = { updateCurrentStream() startPlaying() } self.client.loadFile(url, time: time) { [weak self] _ in self?.isLoadingVideo = true } } else { self.onFileLoaded = { [weak self] in DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) { self?.client.addAudio(stream.audioAsset.url) { _ in updateCurrentStream() startPlaying() } } } self.client.loadFile(stream.videoAsset.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) } } func play() { isPlaying = true startClientUpdates() if controls.presentingControls { startControlsUpdates() } 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(_: Float) { // TODO: Implement rate change } func closeItem() {} func enterFullScreen() {} func exitFullScreen() {} func closePiP(wasPlaying _: Bool) {} func updateControls() { DispatchQueue.main.async { [weak self] in self?.logger.info("updating controls") self?.controls.currentTime = self?.currentTime ?? .zero self?.controls.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.resume() } private func getClientUpdates() { self.logger.info("getting client updates") currentTime = client?.currentTime playerItemDuration = client?.duration if controlsUpdates { updateControls() } model.updateNowPlayingInfo() if let currentTime = currentTime { model.handleSegments(at: currentTime) } timeObserverThrottle.execute { self.model.updateWatch() } } private func stopClientUpdates() { clientTimer.suspend() } private func updateControlsIsPlaying() { DispatchQueue.main.async { [weak self] in self?.controls.isPlaying = self?.isPlaying ?? false } } func handle(_ event: UnsafePointer!) { logger.info("\(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: "log: \(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_UNPAUSE: isLoadingVideo = false case MPV_EVENT_END_FILE: DispatchQueue.main.async { [weak self] in self?.handleEndOfFile(event) } default: logger.info(.init(stringLiteral: "event: \(String(cString: mpv_event_name(event.pointee.event_id)))")) } } func handleEndOfFile(_: UnsafePointer!) { guard !isLoadingVideo else { return } model.prepareCurrentItemForHistory(finished: true) if model.queue.isEmpty { #if !os(macOS) try? AVAudioSession.sharedInstance().setActive(false) #endif model.resetQueue() model.hide() } else { model.advanceToNextItem() } } func setNeedsDrawing(_ needsDrawing: Bool) { client?.setNeedsDrawing(needsDrawing) } func setSize(_ width: Double, _ height: Double) { self.client?.setSize(width, height) } }