mastodon-ios/Mastodon/Service/VideoPlaybackService.swift

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//
// ViedeoPlaybackService.swift
// Mastodon
//
// Created by xiaojian sun on 2021/3/10.
//
import AVKit
import Combine
import CoreDataStack
import Foundation
import os.log
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final class VideoPlaybackService {
var disposeBag = Set<AnyCancellable>()
let workingQueue = DispatchQueue(label: "org.joinmastodon.app.VideoPlaybackService.working-queue")
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private(set) var viewPlayerViewModelDict: [URL: VideoPlayerViewModel] = [:]
// only for video kind
weak var latestPlayingVideoPlayerViewModel: VideoPlayerViewModel?
}
extension VideoPlaybackService {
private func playerViewModel(_ playerViewModel: VideoPlayerViewModel, didUpdateTimeControlStatus: AVPlayer.TimeControlStatus) {
switch playerViewModel.videoKind {
case .gif:
// do nothing
return
case .video:
if playerViewModel.timeControlStatus.value != .paused {
latestPlayingVideoPlayerViewModel = playerViewModel
// pause other player
for viewModel in viewPlayerViewModelDict.values {
guard viewModel.timeControlStatus.value != .paused else { continue }
guard viewModel !== playerViewModel else { continue }
viewModel.pause()
}
} else {
if latestPlayingVideoPlayerViewModel === playerViewModel {
latestPlayingVideoPlayerViewModel = nil
// try? AVAudioSession.sharedInstance().setCategory(.soloAmbient, mode: .default)
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}
}
}
}
}
extension VideoPlaybackService {
func dequeueVideoPlayerViewModel(for media: Attachment) -> VideoPlayerViewModel? {
// Core Data entity not thread-safe. Save attribute before enter working queue
guard let height = media.meta?.original?.height,
let width = media.meta?.original?.width,
let url = URL(string: media.url),
media.type == .gifv || media.type == .video
else { return nil }
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let previewImageURL = media.previewURL.flatMap { URL(string: $0) }
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let videoKind: VideoPlayerViewModel.Kind = media.type == .gifv ? .gif : .video
var _viewModel: VideoPlayerViewModel?
workingQueue.sync {
if let viewModel = viewPlayerViewModelDict[url] {
_viewModel = viewModel
} else {
let viewModel = VideoPlayerViewModel(
previewImageURL: previewImageURL,
videoURL: url,
videoSize: CGSize(width: width, height: height),
videoKind: videoKind
)
viewPlayerViewModelDict[url] = viewModel
setupListener(for: viewModel)
_viewModel = viewModel
}
}
return _viewModel
}
func playerViewModel(for playerViewController: AVPlayerViewController) -> VideoPlayerViewModel? {
guard let url = (playerViewController.player?.currentItem?.asset as? AVURLAsset)?.url else { return nil }
return viewPlayerViewModelDict[url]
}
private func setupListener(for viewModel: VideoPlayerViewModel) {
viewModel.timeControlStatus
.sink { [weak self] timeControlStatus in
guard let self = self else { return }
self.playerViewModel(viewModel, didUpdateTimeControlStatus: timeControlStatus)
}
.store(in: &disposeBag)
NotificationCenter.default.publisher(for: AudioPlaybackService.appWillPlayAudioNotification)
.sink { [weak self] _ in
guard let self = self else { return }
self.pauseWhenPlayAudio()
}
.store(in: &disposeBag)
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}
}
extension VideoPlaybackService {
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func markTransitioning(for status: Status) {
guard let videoAttachment = status.mediaAttachments?.filter({ $0.type == .gifv || $0.type == .video }).first else { return }
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guard let videoPlayerViewModel = dequeueVideoPlayerViewModel(for: videoAttachment) else { return }
videoPlayerViewModel.isTransitioning = true
}
func viewDidDisappear(from viewController: UIViewController?) {
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", (#file as NSString).lastPathComponent, #line, #function)
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// note: do not retain view controller
// pause all player when view disappear exclude full screen player and other transitioning scene
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for viewModel in viewPlayerViewModelDict.values {
guard !viewModel.isTransitioning else {
viewModel.isTransitioning = false
continue
}
guard !viewModel.isFullScreenPresentationing else {
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: isFullScreenPresentationing", (#file as NSString).lastPathComponent, #line, #function)
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continue
}
guard viewModel.videoKind == .video else { continue }
viewModel.pause()
}
}
func pauseWhenPlayAudio() {
for viewModel in viewPlayerViewModelDict.values {
guard !viewModel.isTransitioning else {
viewModel.isTransitioning = false
continue
}
guard !viewModel.isFullScreenPresentationing else {
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: isFullScreenPresentationing", (#file as NSString).lastPathComponent, #line, #function)
continue
}
viewModel.pause()
}
}
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}