105 lines
2.8 KiB
Dart
105 lines
2.8 KiB
Dart
import 'dart:async';
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import 'package:audio_service/audio_service.dart';
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import '../../domain/entities/playback_state.dart' as entity;
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import '../models/playback_state_model.dart';
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import '../models/song_model.dart';
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import 'audio_manager_contract.dart';
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import 'audio_player_task.dart';
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typedef Conversion<S, T> = T Function(S);
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class AudioManagerImpl implements AudioManager {
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final Stream<MediaItem> _currentMediaItemStream =
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AudioService.currentMediaItemStream;
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final Stream<PlaybackState> _sourcePlaybackStateStream =
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AudioService.playbackStateStream;
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@override
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Stream<SongModel> get currentSongStream =>
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_filterStream<MediaItem, SongModel>(
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_currentMediaItemStream,
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(MediaItem mi) => SongModel.fromMediaItem(mi),
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);
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@override
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Stream<entity.PlaybackState> get playbackStateStream => _filterStream(
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_sourcePlaybackStateStream,
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(PlaybackState ps) => PlaybackStateModel.fromASPlaybackState(ps),
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);
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@override
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Stream<int> get currentPositionStream => _position().distinct();
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@override
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Future<void> playSong(int index, List<SongModel> songList) async {
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await _startAudioService();
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final List<MediaItem> queue = songList.map((s) => s.toMediaItem()).toList();
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await AudioService.addQueueItem(queue[index]);
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AudioService.playFromMediaId(queue[index].id);
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}
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@override
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Future<void> play() async {
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await AudioService.play();
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}
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@override
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Future<void> pause() async {
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await AudioService.pause();
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}
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Future<void> _startAudioService() async {
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if (!await AudioService.running) {
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await AudioService.start(
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backgroundTaskEntrypoint: _backgroundTaskEntrypoint,
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enableQueue: true,
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);
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}
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}
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Stream<T> _filterStream<S, T>(Stream<S> stream, Conversion<S, T> fn) async* {
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T lastItem;
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await for (final S item in stream) {
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final T newItem = fn(item);
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if (newItem != lastItem) {
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lastItem = newItem;
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yield newItem;
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}
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}
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}
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Stream<int> _position() async* {
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BasicPlaybackState state;
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int updateTime;
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int statePosition;
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// should this class get an init method for this?
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_sourcePlaybackStateStream.listen((currentState) {
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state = currentState?.basicState;
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updateTime = currentState?.updateTime;
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statePosition = currentState?.position;
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});
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while (true) {
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if (statePosition != null && updateTime != null && state != null) {
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if (state == BasicPlaybackState.playing) {
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yield statePosition +
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(DateTime.now().millisecondsSinceEpoch - updateTime);
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} else {
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yield statePosition;
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}
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} else {
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yield 0;
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}
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await Future.delayed(const Duration(milliseconds: 200));
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}
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}
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}
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void _backgroundTaskEntrypoint() {
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AudioServiceBackground.run(() => AudioPlayerTask());
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}
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