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sjk
332
client/lib/shared/services/audio_service.dart
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332
client/lib/shared/services/audio_service.dart
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import 'dart:io';
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import 'package:path_provider/path_provider.dart';
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import 'package:dio/dio.dart';
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import '../../core/network/api_client.dart';
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import '../../core/errors/app_error.dart';
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import '../models/api_response.dart';
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/// 音频播放状态
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enum AudioPlayerState {
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stopped,
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playing,
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paused,
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loading,
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error,
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}
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/// 音频服务
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class AudioService {
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static final AudioService _instance = AudioService._internal();
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factory AudioService() => _instance;
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AudioService._internal();
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final ApiClient _apiClient = ApiClient.instance;
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AudioPlayerState _state = AudioPlayerState.stopped;
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Duration _duration = Duration.zero;
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Duration _position = Duration.zero;
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double _volume = 1.0;
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double _playbackRate = 1.0;
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String? _currentUrl;
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// 回调函数
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Function(AudioPlayerState)? onStateChanged;
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Function(Duration)? onDurationChanged;
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Function(Duration)? onPositionChanged;
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Function(String)? onError;
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/// 更新播放状态
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void _updateState(AudioPlayerState state) {
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_state = state;
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onStateChanged?.call(state);
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}
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/// 播放网络音频
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Future<void> playFromUrl(String url) async {
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try {
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_updateState(AudioPlayerState.loading);
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_currentUrl = url;
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// TODO: 实现音频播放逻辑
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_updateState(AudioPlayerState.playing);
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} catch (e) {
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_updateState(AudioPlayerState.error);
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onError?.call('播放失败: $e');
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}
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}
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/// 播放本地音频文件
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Future<void> playFromFile(String filePath) async {
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try {
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_updateState(AudioPlayerState.loading);
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_currentUrl = filePath;
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// TODO: 实现本地音频播放逻辑
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_updateState(AudioPlayerState.playing);
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} catch (e) {
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_updateState(AudioPlayerState.error);
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onError?.call('播放失败: $e');
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}
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}
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/// 播放资源文件
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Future<void> playFromAsset(String assetPath) async {
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try {
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_updateState(AudioPlayerState.loading);
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_currentUrl = assetPath;
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// TODO: 实现资源音频播放逻辑
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_updateState(AudioPlayerState.playing);
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} catch (e) {
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_updateState(AudioPlayerState.error);
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onError?.call('播放失败: $e');
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}
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}
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/// 暂停播放
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Future<void> pause() async {
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try {
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// TODO: 实现暂停逻辑
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_updateState(AudioPlayerState.paused);
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} catch (e) {
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onError?.call('暂停失败: $e');
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}
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}
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/// 恢复播放
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Future<void> resume() async {
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try {
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// TODO: 实现恢复播放逻辑
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_updateState(AudioPlayerState.playing);
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} catch (e) {
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onError?.call('恢复播放失败: $e');
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}
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}
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/// 停止播放
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Future<void> stop() async {
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try {
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// TODO: 实现停止播放逻辑
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_updateState(AudioPlayerState.stopped);
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_position = Duration.zero;
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} catch (e) {
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onError?.call('停止播放失败: $e');
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}
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}
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/// 跳转到指定位置
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Future<void> seek(Duration position) async {
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try {
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// TODO: 实现跳转逻辑
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_position = position;
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} catch (e) {
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onError?.call('跳转失败: $e');
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}
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}
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/// 设置音量 (0.0 - 1.0)
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Future<void> setVolume(double volume) async {
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try {
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_volume = volume.clamp(0.0, 1.0);
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// TODO: 实现音量设置逻辑
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} catch (e) {
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onError?.call('设置音量失败: $e');
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}
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}
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/// 设置播放速度 (0.5 - 2.0)
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Future<void> setPlaybackRate(double rate) async {
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try {
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_playbackRate = rate.clamp(0.5, 2.0);
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// TODO: 实现播放速度设置逻辑
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} catch (e) {
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onError?.call('设置播放速度失败: $e');
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}
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}
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/// 下载音频文件
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Future<ApiResponse<String>> downloadAudio({
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required String url,
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required String fileName,
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Function(int, int)? onProgress,
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}) async {
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try {
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final directory = await getApplicationDocumentsDirectory();
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final audioDir = Directory('${directory.path}/audio');
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if (!await audioDir.exists()) {
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await audioDir.create(recursive: true);
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}
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final filePath = '${audioDir.path}/$fileName';
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// TODO: 实现文件下载逻辑
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final response = await _apiClient.get(url);
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final file = File(filePath);
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await file.writeAsBytes(response.data);
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return ApiResponse.success(
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message: '音频下载成功',
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data: filePath,
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);
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} catch (e) {
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return ApiResponse.failure(
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message: '音频下载失败: $e',
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error: e.toString(),
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);
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}
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}
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/// 上传音频文件
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Future<ApiResponse<Map<String, dynamic>>> uploadAudio({
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required String filePath,
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required String type, // 'pronunciation', 'speaking', etc.
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Map<String, dynamic>? metadata,
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Function(int, int)? onProgress,
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}) async {
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try {
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final file = File(filePath);
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if (!await file.exists()) {
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return ApiResponse.failure(
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message: '音频文件不存在',
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error: 'FILE_NOT_FOUND',
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);
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}
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final formData = FormData.fromMap({
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'audio': await MultipartFile.fromFile(
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filePath,
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filename: file.path.split('/').last,
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),
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'type': type,
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if (metadata != null) 'metadata': metadata,
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});
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final response = await _apiClient.post(
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'/audio/upload',
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data: formData,
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);
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if (response.statusCode == 200) {
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return ApiResponse.success(
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message: response.data['message'] ?? '音频上传成功',
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data: response.data['data'],
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);
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} else {
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return ApiResponse.failure(
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message: response.data['message'] ?? '音频上传失败',
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code: response.statusCode,
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);
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}
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} catch (e) {
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return ApiResponse.failure(
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message: '音频上传失败: $e',
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error: e.toString(),
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);
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}
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}
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/// 获取音频文件信息
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Future<ApiResponse<Map<String, dynamic>>> getAudioInfo(String audioId) async {
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try {
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final response = await _apiClient.get('/audio/$audioId');
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if (response.statusCode == 200) {
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return ApiResponse.success(
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message: 'Audio info retrieved successfully',
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data: response.data['data'],
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);
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} else {
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return ApiResponse.failure(
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message: response.data['message'] ?? 'Failed to get audio info',
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code: response.statusCode,
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);
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}
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} catch (e) {
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return ApiResponse.failure(
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message: 'Failed to get audio info: $e',
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error: e.toString(),
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);
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}
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}
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/// 删除本地音频文件
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Future<bool> deleteLocalAudio(String filePath) async {
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try {
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final file = File(filePath);
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if (await file.exists()) {
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await file.delete();
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return true;
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}
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return false;
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} catch (e) {
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onError?.call('删除音频文件失败: $e');
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return false;
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}
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}
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/// 清理缓存的音频文件
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Future<void> clearAudioCache() async {
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try {
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final directory = await getApplicationDocumentsDirectory();
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final audioDir = Directory('${directory.path}/audio');
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if (await audioDir.exists()) {
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await audioDir.delete(recursive: true);
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}
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} catch (e) {
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onError?.call('清理音频缓存失败: $e');
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}
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}
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/// 检查音频文件是否存在
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Future<bool> isAudioCached(String fileName) async {
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try {
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final directory = await getApplicationDocumentsDirectory();
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final filePath = '${directory.path}/audio/$fileName';
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final file = File(filePath);
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return await file.exists();
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} catch (e) {
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return false;
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}
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}
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/// 获取缓存音频文件路径
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Future<String?> getCachedAudioPath(String fileName) async {
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try {
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final directory = await getApplicationDocumentsDirectory();
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final filePath = '${directory.path}/audio/$fileName';
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final file = File(filePath);
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if (await file.exists()) {
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return filePath;
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}
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return null;
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} catch (e) {
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return null;
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}
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}
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/// 释放资源
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Future<void> dispose() async {
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// TODO: 实现资源释放逻辑
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}
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// Getters
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AudioPlayerState get state => _state;
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Duration get duration => _duration;
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Duration get position => _position;
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double get volume => _volume;
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double get playbackRate => _playbackRate;
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String? get currentUrl => _currentUrl;
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bool get isPlaying => _state == AudioPlayerState.playing;
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bool get isPaused => _state == AudioPlayerState.paused;
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bool get isStopped => _state == AudioPlayerState.stopped;
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bool get isLoading => _state == AudioPlayerState.loading;
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/// 获取播放进度百分比 (0.0 - 1.0)
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double get progress {
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if (_duration.inMilliseconds == 0) return 0.0;
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return _position.inMilliseconds / _duration.inMilliseconds;
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}
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}
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