mastodon-ios/Mastodon/Service/AudioPlaybackService.swift

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//
// AudioPlayer.swift
// Mastodon
//
// Created by sxiaojian on 2021/3/8.
//
import AVFoundation
import Combine
import CoreDataStack
import Foundation
import UIKit
import os.log
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final class AudioPlaybackService: NSObject {
static let appWillPlayAudioNotification = NSNotification.Name(rawValue: "org.joinmastodon.app.audio-playback-service.appWillPlayAudio")
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var disposeBag = Set<AnyCancellable>()
var player = AVPlayer()
var timeObserver: Any?
var statusObserver: Any?
var attachment: Attachment?
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let playbackState = CurrentValueSubject<PlaybackState, Never>(PlaybackState.unknown)
let currentTimeSubject = CurrentValueSubject<TimeInterval, Never>(0)
override init() {
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super.init()
addObserver()
playbackState
.receive(on: RunLoop.main)
.sink { status in
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: audio status: %s", ((#file as NSString).lastPathComponent), #line, #function, status.description)
switch status {
case .unknown, .buffering, .readyToPlay:
break
case .playing:
try? AVAudioSession.sharedInstance().setCategory(.playback)
try? AVAudioSession.sharedInstance().setActive(true)
case .paused, .stopped, .failed:
try? AVAudioSession.sharedInstance().setCategory(.soloAmbient) // reset to default
try? AVAudioSession.sharedInstance().setActive(false, options: .notifyOthersOnDeactivation)
}
}
.store(in: &disposeBag)
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}
}
extension AudioPlaybackService {
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func playAudio(audioAttachment: Attachment) {
guard let url = URL(string: audioAttachment.url) else {
return
}
notifyWillPlayAudioNotification()
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if audioAttachment == attachment {
if self.playbackState.value == .stopped {
self.seekToTime(time: .zero)
}
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player.play()
self.playbackState.value = .playing
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return
}
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player.pause()
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let playerItem = AVPlayerItem(url: url)
player.replaceCurrentItem(with: playerItem)
attachment = audioAttachment
player.play()
playbackState.value = .playing
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}
func addObserver() {
NotificationCenter.default.publisher(for: VideoPlayerViewModel.appWillPlayVideoNotification)
.sink { [weak self] _ in
guard let self = self else { return }
self.pauseIfNeed()
}
.store(in: &disposeBag)
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timeObserver = player.addPeriodicTimeObserver(forInterval: CMTimeMake(value: 1, timescale: CMTimeScale(NSEC_PER_SEC)), queue: DispatchQueue.main, using: { [weak self] time in
guard let self = self else { return }
self.currentTimeSubject.value = time.seconds
})
player.publisher(for: \.status, options: [.initial, .new])
.sink(receiveValue: { [weak self] status in
guard let self = self else { return }
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switch status {
case .failed:
self.playbackState.value = .failed
case .readyToPlay:
self.playbackState.value = .readyToPlay
case .unknown:
self.playbackState.value = .unknown
@unknown default:
assertionFailure()
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}
})
.store(in: &disposeBag)
NotificationCenter.default.publisher(for: .AVPlayerItemDidPlayToEndTime, object: nil)
.sink { [weak self] _ in
guard let self = self else { return }
self.player.seek(to: .zero)
self.playbackState.value = .stopped
self.currentTimeSubject.value = 0
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}
.store(in: &disposeBag)
NotificationCenter.default.publisher(for: AVAudioSession.interruptionNotification, object: nil)
.sink { [weak self] _ in
guard let self = self else { return }
self.pause()
}
.store(in: &disposeBag)
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}
func notifyWillPlayAudioNotification() {
NotificationCenter.default.post(name: AudioPlaybackService.appWillPlayAudioNotification, object: nil)
}
func isPlaying() -> Bool {
return playbackState.value == .readyToPlay || playbackState.value == .playing
}
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func resume() {
notifyWillPlayAudioNotification()
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player.play()
playbackState.value = .playing
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}
func pause() {
player.pause()
playbackState.value = .paused
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}
func pauseIfNeed() {
if isPlaying() {
pause()
}
}
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func seekToTime(time: TimeInterval) {
player.seek(to: CMTimeMake(value:Int64(time), timescale: 1))
}
}
extension AudioPlaybackService {
func viewDidDisappear(from viewController: UIViewController?) {
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", (#file as NSString).lastPathComponent, #line, #function)
pause()
}
}