121 lines
2.6 KiB
Dart
121 lines
2.6 KiB
Dart
// lib/services/audio_service.dart
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import 'dart:async'; // ⬅️ 添加这个导入
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import 'package:flutter/material.dart';
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import 'playback_service.dart';
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class Song {
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final String id;
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final String title;
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final String artist;
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final String? url;
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Song({
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required this.id,
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required this.title,
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required this.artist,
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this.url,
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});
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}
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class AudioService extends ChangeNotifier {
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Song? _currentSong;
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bool _isPlaying = false;
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Duration _position = Duration.zero;
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Duration _duration = Duration.zero;
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bool _listening = false;
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final List<StreamSubscription> _subscriptions = [];
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Song? get currentSong => _currentSong;
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bool get isPlaying => _isPlaying;
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Duration get position => _position;
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Duration get duration => _duration;
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// ✅ 完整的播放入口
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Future<void> playSong(Song song) async {
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_currentSong = song;
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_position = Duration.zero;
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_duration = Duration.zero;
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_startListening();
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notifyListeners();
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if (song.url == null || song.url!.isEmpty) {
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return;
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}
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// 播放由 PlaybackService 执行，状态由 stream 更新
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await PlaybackService().play(song.url!);
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}
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// ✅ 只调用播放器方法，不手动修改 _isPlaying
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void togglePlay() {
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if (_currentSong == null) return;
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if (_isPlaying) {
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PlaybackService().pause();
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} else {
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PlaybackService().resume();
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}
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// _isPlaying 由 player.stream.playing 更新
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}
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void stopPlay() {
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_currentSong = null;
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_isPlaying = false;
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_position = Duration.zero;
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_duration = Duration.zero;
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_stopListening();
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notifyListeners();
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}
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void seekTo(Duration position) {
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PlaybackService().seek(position);
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_position = position;
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notifyListeners();
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}
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// ✅ 直接监听 media_kit 的三个独立 Stream
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void _startListening() {
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if (_listening) return;
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_listening = true;
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final player = PlaybackService().player;
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_subscriptions.add(
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player.stream.playing.listen((playing) {
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if (_isPlaying != playing) {
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_isPlaying = playing;
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notifyListeners();
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}
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}),
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);
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_subscriptions.add(
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player.stream.position.listen((position) {
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if (_position != position) {
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_position = position;
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notifyListeners();
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}
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}),
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);
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_subscriptions.add(
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player.stream.duration.listen((duration) {
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if (_duration != duration) {
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_duration = duration;
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notifyListeners();
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}
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}),
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);
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}
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void _stopListening() {
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_listening = false;
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for (final subscription in _subscriptions) {
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subscription.cancel();
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}
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_subscriptions.clear();
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}
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}
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