yattee/Model/Player/Backends/AVPlayerBackend.swift

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Swift
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import AVFoundation
import Defaults
import Foundation
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import Logging
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import MediaPlayer
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#if !os(macOS)
import UIKit
#endif
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final class AVPlayerBackend: PlayerBackend {
static let assetKeysToLoad = ["tracks", "playable", "duration"]
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private var logger = Logger(label: "avplayer-backend")
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var model: PlayerModel!
var controls: PlayerControlsModel!
var playerTime: PlayerTimeModel!
var networkState: NetworkStateModel!
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var seek: SeekModel!
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var stream: Stream?
var video: Video?
var currentTime: CMTime? {
avPlayer.currentTime()
}
var loadedVideo: Bool {
!avPlayer.currentItem.isNil
}
var isLoadingVideo: Bool {
model.currentItem == nil || model.time == nil || !model.time!.isValid
}
var isPlaying: Bool {
avPlayer.timeControlStatus == .playing
}
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var aspectRatio: Double {
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#if os(iOS)
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playerLayer.videoRect.width / playerLayer.videoRect.height
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#else
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VideoPlayerView.defaultAspectRatio
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#endif
}
var isSeeking: Bool {
// TODO: implement this maybe?
false
}
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var playerItemDuration: CMTime? {
avPlayer.currentItem?.asset.duration
}
private(set) var avPlayer = AVPlayer()
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private(set) var playerLayer = AVPlayerLayer()
#if os(tvOS)
var controller: AppleAVPlayerViewController?
#endif
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var startPictureInPictureOnPlay = false
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var startPictureInPictureOnSwitch = false
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private var asset: AVURLAsset?
private var composition = AVMutableComposition()
private var loadedCompositionAssets = [AVMediaType]()
private var frequentTimeObserver: Any?
private var infrequentTimeObserver: Any?
private var playerTimeControlStatusObserver: Any?
private var statusObservation: NSKeyValueObservation?
private var timeObserverThrottle = Throttle(interval: 2)
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internal var controlsUpdates = false
init(model: PlayerModel, controls: PlayerControlsModel?, playerTime: PlayerTimeModel?) {
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self.model = model
self.controls = controls
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self.playerTime = playerTime ?? PlayerTimeModel.shared
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addFrequentTimeObserver()
addInfrequentTimeObserver()
addPlayerTimeControlStatusObserver()
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playerLayer.player = avPlayer
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}
func bestPlayable(_ streams: [Stream], maxResolution: ResolutionSetting) -> Stream? {
let sortedByResolution = streams
.filter { ($0.kind == .adaptive || $0.kind == .stream) && $0.resolution <= maxResolution.value }
.sorted { $0.resolution > $1.resolution }
return streams.first { $0.kind == .hls } ??
sortedByResolution.first { $0.kind == .stream } ??
sortedByResolution.first
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}
func canPlay(_ stream: Stream) -> Bool {
stream.kind == .hls || stream.kind == .stream || (stream.kind == .adaptive && stream.format == .mp4)
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}
func playStream(
_ stream: Stream,
of video: Video,
preservingTime: Bool,
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upgrading _: Bool
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) {
if let url = stream.singleAssetURL {
model.logger.info("playing stream with one asset\(stream.kind == .hls ? " (HLS)" : ""): \(url)")
loadSingleAsset(url, stream: stream, of: video, preservingTime: preservingTime)
} else {
model.logger.info("playing stream with many assets:")
model.logger.info("composition audio asset: \(stream.audioAsset.url)")
model.logger.info("composition video asset: \(stream.videoAsset.url)")
loadComposition(stream, of: video, preservingTime: preservingTime)
}
}
func play() {
guard avPlayer.timeControlStatus != .playing else {
return
}
avPlayer.play()
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model.objectWillChange.send()
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}
func pause() {
guard avPlayer.timeControlStatus != .paused else {
return
}
avPlayer.pause()
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model.objectWillChange.send()
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}
func togglePlay() {
isPlaying ? pause() : play()
}
func stop() {
avPlayer.replaceCurrentItem(with: nil)
}
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func seek(to time: CMTime, seekType _: SeekType, completionHandler: ((Bool) -> Void)?) {
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guard !model.live else { return }
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avPlayer.seek(
to: time,
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toleranceBefore: .zero,
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toleranceAfter: .zero,
completionHandler: completionHandler ?? { _ in }
)
}
func setRate(_ rate: Float) {
avPlayer.rate = rate
}
func closeItem() {
avPlayer.replaceCurrentItem(with: nil)
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video = nil
stream = nil
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}
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func closePiP() {
model.pipController?.stopPictureInPicture()
}
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private func loadSingleAsset(
_ url: URL,
stream: Stream,
of video: Video,
preservingTime: Bool = false
) {
asset?.cancelLoading()
asset = AVURLAsset(url: url)
asset?.loadValuesAsynchronously(forKeys: Self.assetKeysToLoad) { [weak self] in
var error: NSError?
switch self?.asset?.statusOfValue(forKey: "duration", error: &error) {
case .loaded:
DispatchQueue.main.async { [weak self] in
self?.insertPlayerItem(stream, for: video, preservingTime: preservingTime)
}
case .failed:
DispatchQueue.main.async { [weak self] in
self?.model.playerError = error
}
default:
return
}
}
}
private func loadComposition(
_ stream: Stream,
of video: Video,
preservingTime: Bool = false
) {
loadedCompositionAssets = []
loadCompositionAsset(stream.audioAsset, stream: stream, type: .audio, of: video, preservingTime: preservingTime, model: model)
loadCompositionAsset(stream.videoAsset, stream: stream, type: .video, of: video, preservingTime: preservingTime, model: model)
}
private func loadCompositionAsset(
_ asset: AVURLAsset,
stream: Stream,
type: AVMediaType,
of video: Video,
preservingTime: Bool = false,
model: PlayerModel
) {
asset.loadValuesAsynchronously(forKeys: Self.assetKeysToLoad) { [weak self] in
guard let self = self else {
return
}
model.logger.info("loading \(type.rawValue) track")
let assetTracks = asset.tracks(withMediaType: type)
guard let compositionTrack = self.composition.addMutableTrack(
withMediaType: type,
preferredTrackID: kCMPersistentTrackID_Invalid
) else {
model.logger.critical("composition \(type.rawValue) addMutableTrack FAILED")
return
}
guard let assetTrack = assetTracks.first else {
model.logger.critical("asset \(type.rawValue) track FAILED")
return
}
try! compositionTrack.insertTimeRange(
CMTimeRange(start: .zero, duration: CMTime.secondsInDefaultTimescale(video.length)),
of: assetTrack,
at: .zero
)
model.logger.critical("\(type.rawValue) LOADED")
guard model.streamSelection == stream else {
model.logger.critical("IGNORING LOADED")
return
}
self.loadedCompositionAssets.append(type)
if self.loadedCompositionAssets.count == 2 {
self.insertPlayerItem(stream, for: video, preservingTime: preservingTime)
}
}
}
private func insertPlayerItem(
_ stream: Stream,
for video: Video,
preservingTime: Bool = false
) {
removeItemDidPlayToEndTimeObserver()
model.playerItem = playerItem(stream)
guard model.playerItem != nil else {
return
}
addItemDidPlayToEndTimeObserver()
attachMetadata()
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DispatchQueue.main.async {
self.stream = stream
self.video = video
self.model.stream = stream
self.composition = AVMutableComposition()
self.asset = nil
}
let startPlaying = {
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self.setRate(self.model.currentRate)
guard let item = self.model.playerItem, self.isAutoplaying(item) else { return }
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DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) { [weak self] in
guard let self = self else {
return
}
if !preservingTime,
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!self.model.transitioningToPiP,
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let segment = self.model.sponsorBlock.segments.first,
segment.start < 3,
self.model.lastSkipped.isNil
{
self.avPlayer.seek(
to: segment.endTime,
toleranceBefore: .secondsInDefaultTimescale(1),
toleranceAfter: .zero
) { finished in
guard finished else {
return
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}
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self.model.lastSkipped = segment
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self.model.play()
}
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} else {
self.model.play()
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}
}
}
let replaceItemAndSeek = {
guard video == self.model.currentVideo else {
return
}
self.avPlayer.replaceCurrentItem(with: self.model.playerItem)
self.seekToPreservedTime { finished in
guard finished else {
return
}
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DispatchQueue.main.async { [weak self] in
self?.model.preservedTime = nil
}
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startPlaying()
}
}
if preservingTime {
if model.preservedTime.isNil {
model.saveTime {
replaceItemAndSeek()
startPlaying()
}
} else {
replaceItemAndSeek()
startPlaying()
}
} else {
avPlayer.replaceCurrentItem(with: model.playerItem)
startPlaying()
}
}
private func seekToPreservedTime(completionHandler: @escaping (Bool) -> Void = { _ in }) {
guard let time = model.preservedTime else {
return
}
avPlayer.seek(
to: time,
toleranceBefore: .secondsInDefaultTimescale(1),
toleranceAfter: .zero,
completionHandler: completionHandler
)
}
private func playerItem(_: Stream) -> AVPlayerItem? {
if let asset = asset {
return AVPlayerItem(asset: asset)
} else {
return AVPlayerItem(asset: composition)
}
}
private func attachMetadata() {
guard let video = model.currentVideo else { return }
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#if !os(macOS)
var externalMetadata = [
makeMetadataItem(.commonIdentifierTitle, value: video.title),
makeMetadataItem(.quickTimeMetadataGenre, value: video.genre ?? ""),
makeMetadataItem(.commonIdentifierDescription, value: video.description ?? "")
]
if let thumbnailURL = video.thumbnailURL(quality: .medium) {
let task = URLSession.shared.dataTask(with: thumbnailURL) { [weak self] thumbnailData, _, _ in
guard let thumbnailData = thumbnailData else { return }
let image = UIImage(data: thumbnailData)
if let pngData = image?.pngData() {
if let artworkItem = self?.makeMetadataItem(.commonIdentifierArtwork, value: pngData) {
externalMetadata.append(artworkItem)
}
}
self?.avPlayer.currentItem?.externalMetadata = externalMetadata
}
task.resume()
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}
#endif
if let item = model.playerItem {
#if !os(macOS)
item.externalMetadata = externalMetadata
#endif
item.preferredForwardBufferDuration = 5
observePlayerItemStatus(item)
}
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}
#if !os(macOS)
private func makeMetadataItem(_ identifier: AVMetadataIdentifier, value: Any) -> AVMetadataItem {
let item = AVMutableMetadataItem()
item.identifier = identifier
item.value = value as? NSCopying & NSObjectProtocol
item.extendedLanguageTag = "und"
return item.copy() as! AVMetadataItem
}
#endif
func isAutoplaying(_ item: AVPlayerItem) -> Bool {
avPlayer.currentItem == item
}
private func observePlayerItemStatus(_ item: AVPlayerItem) {
statusObservation?.invalidate()
statusObservation = item.observe(\.status, options: [.old, .new]) { [weak self] playerItem, _ in
guard let self = self else {
return
}
switch playerItem.status {
case .readyToPlay:
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if self.model.playingInPictureInPicture {
self.startPictureInPictureOnSwitch = false
self.startPictureInPictureOnPlay = false
}
if self.model.activeBackend == .appleAVPlayer,
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self.isAutoplaying(playerItem)
{
self.model.updateAspectRatio()
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if self.startPictureInPictureOnPlay,
let controller = self.model.pipController,
controller.isPictureInPicturePossible
{
self.tryStartingPictureInPicture()
} else {
self.model.play()
}
} else if self.startPictureInPictureOnPlay {
self.startPictureInPictureOnPlay = false
self.model.stream = self.stream
self.model.streamSelection = self.stream
if self.model.activeBackend != .appleAVPlayer {
self.startPictureInPictureOnSwitch = true
let seconds = self.model.mpvBackend.currentTime?.seconds ?? 0
self.seek(to: seconds, seekType: .backendSync) { _ in
DispatchQueue.main.async {
self.model.pause()
self.model.changeActiveBackend(from: .mpv, to: .appleAVPlayer, changingStream: false)
}
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}
}
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}
case .failed:
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DispatchQueue.main.async {
self.model.playerError = item.error
}
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default:
return
}
}
}
private func addItemDidPlayToEndTimeObserver() {
NotificationCenter.default.addObserver(
self,
selector: #selector(itemDidPlayToEndTime),
name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
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object: model.playerItem
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)
}
private func removeItemDidPlayToEndTimeObserver() {
NotificationCenter.default.removeObserver(
self,
name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
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object: model.playerItem
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)
}
@objc func itemDidPlayToEndTime() {
if Defaults[.closeLastItemOnPlaybackEnd] {
model.prepareCurrentItemForHistory(finished: true)
}
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eofPlaybackModeAction()
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}
private func addFrequentTimeObserver() {
let interval = CMTime.secondsInDefaultTimescale(0.5)
frequentTimeObserver = avPlayer.addPeriodicTimeObserver(
forInterval: interval,
queue: .main
) { [weak self] _ in
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guard let self = self, self.model.activeBackend == .appleAVPlayer else {
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return
}
guard !self.model.currentItem.isNil else {
return
}
self.model.updateNowPlayingInfo()
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#if os(macOS)
MPNowPlayingInfoCenter.default().playbackState = self.avPlayer.timeControlStatus == .playing ? .playing : .paused
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#endif
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if self.controls.isPlaying != self.isPlaying {
DispatchQueue.main.async {
self.controls.isPlaying = self.isPlaying
}
}
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if let currentTime = self.currentTime {
self.model.handleSegments(at: currentTime)
}
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#if !os(macOS)
guard UIApplication.shared.applicationState != .background else {
print("not performing controls updates in background")
return
}
#endif
if self.controlsUpdates {
self.updateControls()
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}
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}
}
private func addInfrequentTimeObserver() {
let interval = CMTime.secondsInDefaultTimescale(5)
infrequentTimeObserver = avPlayer.addPeriodicTimeObserver(
forInterval: interval,
queue: .main
) { [weak self] _ in
guard let self = self else {
return
}
guard !self.model.currentItem.isNil else {
return
}
self.timeObserverThrottle.execute {
self.model.updateWatch()
}
}
}
private func addPlayerTimeControlStatusObserver() {
playerTimeControlStatusObserver = avPlayer.observe(\.timeControlStatus) { [weak self] player, _ in
guard let self = self,
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self.avPlayer == player,
self.model.activeBackend == .appleAVPlayer
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else {
return
}
let isPlaying = player.timeControlStatus == .playing
if self.controls.isPlaying != isPlaying {
DispatchQueue.main.async {
self.controls.isPlaying = player.timeControlStatus == .playing
}
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}
if player.timeControlStatus != .waitingToPlayAtSpecifiedRate {
DispatchQueue.main.async { [weak self] in
self?.model.objectWillChange.send()
}
}
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if player.timeControlStatus == .playing {
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self.model.objectWillChange.send()
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if player.rate != self.model.currentRate {
player.rate = self.model.currentRate
}
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}
#if os(macOS)
if player.timeControlStatus == .playing {
ScreenSaverManager.shared.disable(reason: "Yattee is playing video")
} else {
ScreenSaverManager.shared.enable()
}
#endif
self.timeObserverThrottle.execute {
self.model.updateWatch()
}
}
}
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func startControlsUpdates() {
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guard model.presentingPlayer, model.controls.presentingControls, !model.controls.presentingOverlays else {
logger.info("ignored controls update start")
return
}
logger.info("starting controls updates")
controlsUpdates = true
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model.objectWillChange.send()
}
func stopControlsUpdates() {
controlsUpdates = false
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model.objectWillChange.send()
}
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func startMusicMode() {
if model.playingInPictureInPicture {
closePiP()
}
playerLayer.player = nil
toggleVisualTracksEnabled(false)
}
func stopMusicMode() {
playerLayer.player = avPlayer
toggleVisualTracksEnabled(true)
}
func toggleVisualTracksEnabled(_ value: Bool) {
if let item = avPlayer.currentItem {
for playerItemTrack in item.tracks {
if let assetTrack = playerItemTrack.assetTrack,
assetTrack.hasMediaCharacteristic(AVMediaCharacteristic.visual)
{
playerItemTrack.isEnabled = value
}
}
}
}
func didChangeTo() {
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if startPictureInPictureOnSwitch {
startPictureInPictureOnSwitch = false
tryStartingPictureInPicture()
} else if model.musicMode {
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startMusicMode()
} else {
stopMusicMode()
}
}
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func tryStartingPictureInPicture() {
guard let controller = model.pipController else { return }
var opened = false
for delay in [0.1, 0.3, 0.5, 1, 2, 3, 5] {
Delay.by(delay) {
guard !opened else { return }
if controller.isPictureInPicturePossible {
opened = true
controller.startPictureInPicture()
} else {
print("PiP not possible, waited \(delay) seconds")
}
}
}
}
func getTimeUpdates() {}
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func setNeedsDrawing(_: Bool) {}
func setSize(_: Double, _: Double) {}
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func setNeedsNetworkStateUpdates(_: Bool) {}
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}