241 lines
8.4 KiB
Dart
241 lines
8.4 KiB
Dart
import 'dart:async';
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import 'dart:io';
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import 'package:flutter/services.dart';
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import 'package:flutter/widgets.dart';
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import 'package:path/path.dart' as p;
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import 'package:path_provider/path_provider.dart';
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import 'package:rxdart/rxdart.dart';
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/// An object to manage playing audio from a URL, a locale file or an asset.
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///
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/// ```
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/// final player = AudioPlayer();
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/// await player.setUrl('https://foo.com/bar.mp3');
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/// await player.play();
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/// await player.pause();
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/// await player.play(untilPosition: Duration(minutes: 1));
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/// await player.stop()
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/// await player.setUrl('https://foo.com/baz.mp3');
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/// await player.seek(Duration(minutes: 5));
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/// await player.play();
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/// await player.stop();
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/// await player.dispose();
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/// ```
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///
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/// You must call [dispose] to release the resources used by this player,
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/// including any temporary files created to cache assets.
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///
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/// The [AudioPlayer] instance transitions through different states as follows:
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///
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/// * [AudioPlaybackState.none]: immediately after instantiation.
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/// * [AudioPlaybackState.stopped]: eventually after [setUrl], [setFilePath] or
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/// [setAsset] completes, immediately after [stop], and immediately after
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/// playback naturally reaches the end of the media.
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/// * [AudioPlaybackState.paused]: after [pause] and after reaching the end of
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/// the requested [play] segment.
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/// * [AudioPlaybackState.playing]: after [play] and after sufficiently
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/// buffering during normal playback.
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/// * [AudioPlaybackState.buffering]: immediately after a seek request and
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/// during normal playback when the next buffer is not ready to be played.
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/// * [AudioPlaybackState.connecting]: immediately after [setUrl],
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/// [setFilePath] and [setAsset] while waiting for the media to load.
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///
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/// Additionally, after a [seek] request completes, the state will return to
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/// whatever state the player was in prior to the seek request.
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class AudioPlayer {
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static final _mainChannel =
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MethodChannel('com.ryanheise.just_audio.methods');
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static Future<MethodChannel> _createChannel(int id) async {
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await _mainChannel.invokeMethod('init', id);
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return MethodChannel('com.ryanheise.just_audio.methods.$id');
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}
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final Future<MethodChannel> _channel;
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final int _id;
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Future<Duration> _durationFuture;
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final _durationSubject = BehaviorSubject<Duration>();
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AudioPlayerState _audioPlayerState;
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Stream<AudioPlayerState> _eventChannelStream;
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StreamSubscription<AudioPlayerState> _eventChannelStreamSubscription;
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final _playerStateSubject = BehaviorSubject<AudioPlayerState>();
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final _playbackStateSubject = BehaviorSubject<AudioPlaybackState>();
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/// Creates an [AudioPlayer].
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factory AudioPlayer() =>
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AudioPlayer._internal(DateTime.now().microsecondsSinceEpoch);
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AudioPlayer._internal(this._id) : _channel = _createChannel(_id) {
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_eventChannelStream = EventChannel('com.ryanheise.just_audio.events.$_id')
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.receiveBroadcastStream()
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.map((data) => _audioPlayerState = AudioPlayerState(
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state: AudioPlaybackState.values[data[0]],
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updatePosition: Duration(milliseconds: data[1]),
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updateTime: Duration(milliseconds: data[2]),
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));
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_eventChannelStreamSubscription =
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_eventChannelStream.listen(_playerStateSubject.add);
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_playbackStateSubject
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.addStream(playerStateStream.map((state) => state.state).distinct());
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}
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/// The duration of any media set via [setUrl], [setFilePath] or [setAsset],
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/// or null otherwise.
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Future<Duration> get durationFuture => _durationFuture;
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/// The duration of any media set via [setUrl], [setFilePath] or [setAsset].
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Stream<Duration> get durationStream => _durationSubject.stream;
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/// The current [AudioPlayerState].
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AudioPlayerState get playerState => _audioPlayerState;
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/// The current [AudioPlayerState].
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Stream<AudioPlayerState> get playerStateStream => _playerStateSubject.stream;
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/// The current [AudioPlaybackState].
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Stream<AudioPlaybackState> get playbackStateStream =>
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_playbackStateSubject.stream;
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/// A stream periodically tracking the current position of this player.
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Stream<Duration> getPositionStream(
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[final Duration period = const Duration(milliseconds: 200)]) =>
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Observable.combineLatest2<AudioPlayerState, void, Duration>(
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playerStateStream,
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Observable.periodic(period),
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(state, _) => state.position);
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/// Loads audio media from a URL and returns the duration of that audio.
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Future<Duration> setUrl(final String url) async {
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_durationFuture =
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_invokeMethod('setUrl', [url]).then((ms) => Duration(milliseconds: ms));
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final duration = await _durationFuture;
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_durationSubject.add(duration);
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return duration;
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}
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/// Loads audio media from a file and returns the duration of that audio.
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Future<Duration> setFilePath(final String filePath) => setUrl('file://$filePath');
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/// Loads audio media from an asset and returns the duration of that audio.
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Future<Duration> setAsset(final String assetPath) async {
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final file = await _cacheFile;
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if (!file.existsSync()) {
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await file.create(recursive: true);
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}
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await file.writeAsBytes(
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(await rootBundle.load(assetPath)).buffer.asUint8List());
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return await setFilePath(file.path);
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}
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Future<File> get _cacheFile async => File(p.join((await getTemporaryDirectory()).path, 'just_audio_asset_cache', '$_id'));
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/// Plays the currently loaded media from the current position. It is legal
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/// to invoke this method only from one of the following states:
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///
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/// * [AudioPlaybackState.stopped]
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/// * [AudioPlaybackState.paused]
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Future<void> play({final Duration untilPosition}) async {
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StreamSubscription subscription;
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Completer completer = Completer();
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subscription = playbackStateStream
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.skip(1)
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.where((state) =>
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state == AudioPlaybackState.paused ||
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state == AudioPlaybackState.stopped)
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.listen((state) {
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subscription.cancel();
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completer.complete();
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});
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await _invokeMethod('play', [untilPosition?.inMilliseconds]);
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await completer.future;
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}
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/// Pauses the currently playing media. It is legal to invoke this method
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/// only from the following states:
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///
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/// * [AudioPlaybackState.playing]
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/// * [AudioPlaybackState.buffering]
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Future<void> pause() async {
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await _invokeMethod('pause');
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}
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/// Stops the currently playing media such that the next [play] invocation
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/// will start from position 0. It is legal to invoke this method from any
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/// state except for:
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///
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/// * [AudioPlaybackState.none]
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/// * [AudioPlaybackState.stopped]
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Future<void> stop() async {
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await _invokeMethod('stop');
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}
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/// Sets the volume of this player, where 1.0 is normal volume.
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Future<void> setVolume(final double volume) async {
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await _invokeMethod('setVolume', [volume]);
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}
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/// Seeks to a particular position. It is legal to invoke this method
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/// from any state except for [AudioPlaybackState.none].
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Future<void> seek(final Duration position) async {
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await _invokeMethod('seek', [position.inMilliseconds]);
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}
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/// Release all resources associated with this player. You must invoke
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/// this after you are done with the player.
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Future<void> dispose() async {
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if ((await _cacheFile).existsSync()) {
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(await _cacheFile).deleteSync();
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}
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await _invokeMethod('dispose');
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await _durationSubject.close();
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await _eventChannelStreamSubscription.cancel();
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await _playerStateSubject.close();
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}
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Future<dynamic> _invokeMethod(String method, [dynamic args]) async =>
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(await _channel).invokeMethod(method, args);
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}
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/// Encapsulates the playback state and current position of the player.
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class AudioPlayerState {
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/// The current playback state.
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final AudioPlaybackState state;
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/// When the last time a position discontinuity happened, as measured in time
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/// since the epoch.
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final Duration updateTime;
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/// The position at [updateTime].
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final Duration updatePosition;
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AudioPlayerState({
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@required this.state,
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@required this.updateTime,
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@required this.updatePosition,
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});
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/// The current position of the player.
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Duration get position => state == AudioPlaybackState.playing
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? updatePosition +
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(Duration(milliseconds: DateTime.now().millisecondsSinceEpoch) -
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updateTime)
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: updatePosition;
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}
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/// Enumerates the different playback states of a player.
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enum AudioPlaybackState {
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none,
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stopped,
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paused,
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playing,
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buffering,
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connecting,
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}
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