426 lines
14 KiB
Dart
426 lines
14 KiB
Dart
import 'dart:math';
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import 'package:audio_session/audio_session.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:just_audio/just_audio.dart';
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void main() => runApp(MyApp());
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class MyApp extends StatefulWidget {
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@override
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_MyAppState createState() => _MyAppState();
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}
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class _MyAppState extends State<MyApp> {
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AudioPlayer _player;
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ConcatenatingAudioSource _playlist = ConcatenatingAudioSource(children: [
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LoopingAudioSource(
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count: 2,
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child: ClippingAudioSource(
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start: Duration(seconds: 60),
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end: Duration(seconds: 65),
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child: AudioSource.uri(Uri.parse(
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"https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3")),
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tag: AudioMetadata(
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album: "Science Friday",
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title: "A Salute To Head-Scratching Science (5 seconds)",
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artwork:
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"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
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),
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),
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),
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AudioSource.uri(
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Uri.parse(
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"https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3"),
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tag: AudioMetadata(
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album: "Science Friday",
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title: "A Salute To Head-Scratching Science",
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artwork:
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"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
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),
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),
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AudioSource.uri(
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Uri.parse("https://s3.amazonaws.com/scifri-segments/scifri201711241.mp3"),
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tag: AudioMetadata(
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album: "Science Friday",
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title: "From Cat Rheology To Operatic Incompetence",
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artwork:
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"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg",
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),
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),
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]);
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@override
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void initState() {
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super.initState();
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_player = AudioPlayer();
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SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
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statusBarColor: Colors.black,
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));
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_init();
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}
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_init() async {
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final session = await AudioSession.instance;
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await session.configure(AudioSessionConfiguration.speech());
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try {
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await _player.load(_playlist);
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} catch (e) {
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// catch load errors: 404, invalid url ...
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print("An error occured $e");
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}
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}
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@override
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void dispose() {
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_player.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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debugShowCheckedModeBanner: false,
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home: Scaffold(
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body: SafeArea(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.center,
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Expanded(
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child: StreamBuilder<SequenceState>(
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stream: _player.sequenceStateStream,
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builder: (context, snapshot) {
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final state = snapshot.data;
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if (state?.sequence?.isEmpty ?? true) return SizedBox();
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final metadata = state.currentSource.tag as AudioMetadata;
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return Column(
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crossAxisAlignment: CrossAxisAlignment.center,
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children: [
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Expanded(
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child: Padding(
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padding: const EdgeInsets.all(8.0),
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child:
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Center(child: Image.network(metadata.artwork)),
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),
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),
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Text(metadata.album ?? '',
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style: Theme.of(context).textTheme.headline6),
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Text(metadata.title ?? ''),
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],
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);
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},
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),
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),
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ControlButtons(_player),
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StreamBuilder<Duration>(
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stream: _player.durationStream,
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builder: (context, snapshot) {
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final duration = snapshot.data ?? Duration.zero;
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return StreamBuilder<Duration>(
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stream: _player.positionStream,
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builder: (context, snapshot) {
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var position = snapshot.data ?? Duration.zero;
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if (position > duration) {
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position = duration;
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}
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return SeekBar(
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duration: duration,
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position: position,
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onChangeEnd: (newPosition) {
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_player.seek(newPosition);
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},
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);
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},
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);
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},
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),
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SizedBox(height: 8.0),
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Row(
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children: [
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StreamBuilder<LoopMode>(
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stream: _player.loopModeStream,
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builder: (context, snapshot) {
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final loopMode = snapshot.data ?? LoopMode.off;
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const icons = [
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Icon(Icons.repeat, color: Colors.grey),
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Icon(Icons.repeat, color: Colors.orange),
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Icon(Icons.repeat_one, color: Colors.orange),
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];
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const cycleModes = [
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LoopMode.off,
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LoopMode.all,
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LoopMode.one,
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];
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final index = cycleModes.indexOf(loopMode);
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return IconButton(
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icon: icons[index],
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onPressed: () {
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_player.setLoopMode(cycleModes[
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(cycleModes.indexOf(loopMode) + 1) %
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cycleModes.length]);
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},
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);
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},
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),
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Expanded(
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child: Text(
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"Playlist",
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style: Theme.of(context).textTheme.headline6,
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textAlign: TextAlign.center,
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),
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),
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StreamBuilder<bool>(
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stream: _player.shuffleModeEnabledStream,
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builder: (context, snapshot) {
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final shuffleModeEnabled = snapshot.data ?? false;
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return IconButton(
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icon: shuffleModeEnabled
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? Icon(Icons.shuffle, color: Colors.orange)
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: Icon(Icons.shuffle, color: Colors.grey),
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onPressed: () {
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_player.setShuffleModeEnabled(!shuffleModeEnabled);
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},
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);
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},
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),
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],
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),
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Container(
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height: 240.0,
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child: StreamBuilder<SequenceState>(
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stream: _player.sequenceStateStream,
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builder: (context, snapshot) {
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final state = snapshot.data;
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final sequence = state?.sequence ?? [];
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return ListView.builder(
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itemCount: sequence.length,
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itemBuilder: (context, index) => Material(
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color: index == state.currentIndex
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? Colors.grey.shade300
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: null,
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child: ListTile(
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title: Text(sequence[index].tag.title),
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onTap: () {
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_player.seek(Duration.zero, index: index);
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},
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),
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),
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);
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},
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),
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),
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],
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),
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),
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),
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);
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}
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}
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class ControlButtons extends StatelessWidget {
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final AudioPlayer player;
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ControlButtons(this.player);
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@override
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Widget build(BuildContext context) {
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return Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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IconButton(
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icon: Icon(Icons.volume_up),
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onPressed: () {
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_showSliderDialog(
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context: context,
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title: "Adjust volume",
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divisions: 10,
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min: 0.0,
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max: 1.0,
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stream: player.volumeStream,
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onChanged: player.setVolume,
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);
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},
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),
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StreamBuilder<SequenceState>(
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stream: player.sequenceStateStream,
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builder: (context, snapshot) => IconButton(
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icon: Icon(Icons.skip_previous),
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onPressed: player.hasPrevious ? player.seekToPrevious : null,
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),
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),
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StreamBuilder<PlayerState>(
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stream: player.playerStateStream,
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builder: (context, snapshot) {
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final playerState = snapshot.data;
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final processingState = playerState?.processingState;
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final playing = playerState?.playing;
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if (processingState == ProcessingState.loading ||
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processingState == ProcessingState.buffering) {
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return Container(
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margin: EdgeInsets.all(8.0),
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width: 64.0,
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height: 64.0,
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child: CircularProgressIndicator(),
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);
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} else if (playing != true) {
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return IconButton(
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icon: Icon(Icons.play_arrow),
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iconSize: 64.0,
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onPressed: player.play,
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);
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} else if (processingState != ProcessingState.completed) {
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return IconButton(
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icon: Icon(Icons.pause),
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iconSize: 64.0,
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onPressed: player.pause,
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);
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} else {
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return IconButton(
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icon: Icon(Icons.replay),
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iconSize: 64.0,
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onPressed: () => player.seek(Duration.zero, index: 0),
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);
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}
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},
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),
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StreamBuilder<SequenceState>(
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stream: player.sequenceStateStream,
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builder: (context, snapshot) => IconButton(
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icon: Icon(Icons.skip_next),
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onPressed: player.hasNext ? player.seekToNext : null,
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),
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),
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StreamBuilder<double>(
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stream: player.speedStream,
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builder: (context, snapshot) => IconButton(
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icon: Text("${snapshot.data?.toStringAsFixed(1)}x",
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style: TextStyle(fontWeight: FontWeight.bold)),
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onPressed: () {
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_showSliderDialog(
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context: context,
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title: "Adjust speed",
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divisions: 10,
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min: 0.5,
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max: 1.5,
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stream: player.speedStream,
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onChanged: player.setSpeed,
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);
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},
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),
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),
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],
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);
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}
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}
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class SeekBar extends StatefulWidget {
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final Duration duration;
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final Duration position;
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final ValueChanged<Duration> onChanged;
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final ValueChanged<Duration> onChangeEnd;
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SeekBar({
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@required this.duration,
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@required this.position,
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this.onChanged,
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this.onChangeEnd,
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});
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@override
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_SeekBarState createState() => _SeekBarState();
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}
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class _SeekBarState extends State<SeekBar> {
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double _dragValue;
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@override
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Widget build(BuildContext context) {
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return Stack(
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children: [
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Slider(
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min: 0.0,
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max: widget.duration.inMilliseconds.toDouble(),
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value: min(_dragValue ?? widget.position.inMilliseconds.toDouble(),
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widget.duration.inMilliseconds.toDouble()),
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onChanged: (value) {
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setState(() {
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_dragValue = value;
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});
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if (widget.onChanged != null) {
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widget.onChanged(Duration(milliseconds: value.round()));
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}
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},
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onChangeEnd: (value) {
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if (widget.onChangeEnd != null) {
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widget.onChangeEnd(Duration(milliseconds: value.round()));
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}
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_dragValue = null;
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},
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),
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Positioned(
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right: 16.0,
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bottom: 0.0,
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child: Text(
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RegExp(r'((^0*[1-9]\d*:)?\d{2}:\d{2})\.\d+$')
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.firstMatch("$_remaining")
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?.group(1) ??
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'$_remaining',
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style: Theme.of(context).textTheme.caption),
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),
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],
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);
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}
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Duration get _remaining => widget.duration - widget.position;
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}
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_showSliderDialog({
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BuildContext context,
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String title,
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int divisions,
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double min,
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double max,
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String valueSuffix = '',
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Stream<double> stream,
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ValueChanged<double> onChanged,
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}) {
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showDialog(
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context: context,
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builder: (context) => AlertDialog(
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title: Text(title, textAlign: TextAlign.center),
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content: StreamBuilder<double>(
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stream: stream,
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builder: (context, snapshot) => Container(
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height: 100.0,
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child: Column(
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children: [
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Text('${snapshot.data?.toStringAsFixed(1)}$valueSuffix',
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style: TextStyle(
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fontFamily: 'Fixed',
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fontWeight: FontWeight.bold,
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fontSize: 24.0)),
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Slider(
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divisions: divisions,
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min: min,
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max: max,
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value: snapshot.data ?? 1.0,
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onChanged: onChanged,
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),
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],
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),
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),
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),
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),
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);
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}
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class AudioMetadata {
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final String album;
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final String title;
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final String artwork;
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AudioMetadata({this.album, this.title, this.artwork});
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}
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