The library should be able to show a simple UI to pick an audio file from storage.

I think of the following method signature:

• Future<AudioFile> showPicker() - opens a simple picker for an audio file. The type AudioFile is the same as defined in #8.

I think we need to cleanup some files and code lines.

For example, in the following classes, MCMediaPickerController.h and MCMediaPickerController.m use the word MC, which was our first organization's name.

And here, audio_player is still used.

Shouldn't we rename all of these to relate more to stereo (if stereo is definitive ?) ? I haven't checked all the repo, at the moment.

The library should be able to load an audio file to be played.

I see the following methods:

• void load(String) - load the audio file from a string representing the URI to the file
• void load(URI) - load the audio file from an URI pointing to the file
• void load(AudioFile) - load the audio file directly from an audio file

The two firsts methods would call the later one to avoid redundancy.

These methods should throw an exception if the audio file can't be loaded.

Hi There

After selecting an audio file the app crashes

The code I'm using is

Future<Null> _selectAudio(BuildContext context) async {
    print("Selecting audio");
    try {
      var track = await _stereo.picker();  
      File newFile = File(track.path);
      print(newFile.length());
    } catch (e) {
      print(e);
    }
  }

The exception is

Shutting down VM
FATAL EXCEPTION: main
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://com.android.externalstorage.documents/document/3430-6463:Android/output/Afrik.mp3 flg=0x1 }} to activity {com.example.mobile/com.example.mobile.MainActivity}: java.lang.IllegalArgumentException
E/AndroidRuntime(18479): at android.app.ActivityThread.deliverResults(ActivityThread.java:3742)
E/AndroidRuntime(18479): 	at android.app.ActivityThread.handleSendResult(ActivityThread.java:3785)
E/AndroidRuntime(18479): 	at android.app.ActivityThread.access$1400(ActivityThread.java:157)
E/AndroidRuntime(18479): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
E/AndroidRuntime(18479): 	at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime(18479): 	at android.os.Looper.loop(Looper.java:148)
E/AndroidRuntime(18479): 	at android.app.ActivityThread.main(ActivityThread.java:5527)
E/AndroidRuntime(18479): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(18479): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
E/AndroidRuntime(18479): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
E/AndroidRuntime(18479): Caused by: java.lang.IllegalArgumentException
E/AndroidRuntime(18479): 	at android.media.MediaMetadataRetriever.setDataSource(MediaMetadataRetriever.java:73)
E/AndroidRuntime(18479): 	at com.twofind.stereo.AudioTrack.toJson(AudioTrack.java:14)
E/AndroidRuntime(18479): 	at com.twofind.stereo.StereoPlugin.onActivityResult(StereoPlugin.java:242)
E/AndroidRuntime(18479): 	at io.flutter.app.FlutterPluginRegistry.onActivityResult(FlutterPluginRegistry.java:194)
E/AndroidRuntime(18479): 	at io.flutter.app.FlutterActivityDelegate.onActivityResult(FlutterActivityDelegate.java:146)
E/AndroidRuntime(18479): 	at io.flutter.app.FlutterActivity.onActivityResult(FlutterActivity.java:139)
E/AndroidRuntime(18479): 	at android.app.Activity.dispatchActivityResult(Activity.java:6463)
E/AndroidRuntime(18479): 	at android.app.ActivityThread.deliverResults(ActivityThread.java:3738)

The audio file I'm selecting is in external storage, I moved it to internal and still got the same error.

The library should be able to unload an audio file. I see the following method:

• void unload() - unload the audio file

This method should throw an exception if the audio file can't be unloaded.

The library should be able to play/pause an audio file.

When an audio file is playing, calling this method should pause the audio file and when an audio file is in pause, calling this method should play/resume the audio file.

I see the following method:

• void togglePlaying() - toggle the play/pause state

This method should throw an exception if the audio file can't have its play/pause state changed.

First of all, what should we name it? I was thinking of something like Track, Song, StereoItem, MediaItem. Please let me know if you have other ideas.

What information should this class hold? Here are some thoughts:

• Title
• Artist
• Album
• URI
• Length
• Artwork URI

I'm getting the following error message when I try to run the Stereo example on iOS

Failed to build iOS app Error output from Xcode build: ↳ ** BUILD FAILED **

Xcode's output: ↳ === BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug === /Users/leehunter/Documents/GitHub/stereo/example/ios/Runner/GeneratedPluginRegistrant.m:13:4: error: unknown receiver 'STStereoPlugin'; did you mean 'StereoPlugin'? [STStereoPlugin registerWithRegistrar:[registry registrarForPlugin:@"STStereoPlugin"]]; ^~~~~~~~~~~~~~ StereoPlugin In file included from /Users/leehunter/Documents/GitHub/stereo/example/ios/Runner/GeneratedPluginRegistrant.m:7: /Users/leehunter/Documents/GitHub/stereo/example/ios/Pods/Headers/Public/stereo/StereoPlugin.h: 5:12: note: 'StereoPlugin' declared here @interface StereoPlugin : NSObject ^ 1 error generated.

Could not build the application for the simulator. Error launching application on iPhone XR.

In the example app, I can only play the sample files and no others. So far I've tried to load four MP3 files (i.e. by changing the yaml file and main.dart) and I get the "File not playable" message each time I tried to load the file.

This happens even if I leave the example app code the same but simply rename my substitute files to dubstep.mp3.

Because the stereo library initiates a playback session on loading of the application, apps that want to use this with a recording library will fail on a physical iPhone. See https://stackoverflow.com/questions/50687163/how-can-i-track-down-interference-between-the-flutter-libraries-audo-recorder-an

This change defers the initiating of the audio playback session until it is needed so that it doesn't interfere when another library needs to initiate an audio recording session.

This pull request adds the following method to the library:

• Future<AudioTrack> picker(): shows an UI to pick a track from storage (closes #26)

It also adds the following members:

• ValueNotifier<AudioTrack> currentTrackNotifier: notifies listeners every time the playing track changes.
• AudioTrack currentTrack: current playing track.

The class AudioTrack has been added (closes #8). It currently represents a track with the following fileds:

• String album
• String artist
• Uint8List artwork
• String path
• String title

The example has been updated to reflect library changes.

Currently trying to use stereo to play background music in my app and I keep receiving issues whenever I call the load(String) from the Stereo.dart class.

Whenever I looked further into the issue I figured out that the issue comes directly from the AudioTrack.java class whenever this line is called

mmr.setDataSource(path);

To replicate the issue, just add this code into the example project.

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
import 'package:stereo/stereo.dart';

void main() {
  runApp(new MaterialApp(home: new ExampleApp()));
}

class ExampleApp extends StatefulWidget {
  @override
  _ExampleAppState createState() => new _ExampleAppState();
}

class _ExampleAppState extends State<ExampleApp> {

  Stereo _stereo;

  @override
  initState() {
    super.initState();
    _stereo = new Stereo();
    _playMusic();
  }


  _playMusic() async {
    await _copyFiles();
    await _loadMusic();
  }

  _loadMusic() async {
    String dir = '';
    String mp3 = "pi.mp3";
    await getApplicationDocumentsDirectory().then(
            (Directory directory) => dir = 'file://' + directory.path + '/');
    try {
      await _stereo.load('$dir$mp3');
//      _stereo.play();
    } on StereoFileNotPlayableException {
      var alert = new AlertDialog(
          title: new Text('File not playable'),
          content: new Text('The file you specified is not playable.'));
      showDialog(context: context, child: alert);
    }
  }

  _copyFiles() async {
    final Directory dir = await getApplicationDocumentsDirectory();

    final File song = new File('${dir.path}/pi.mp3');

    if (!(await song.exists())) {
      final data = await rootBundle.load('assets/songs/pi.mp3');
      final bytes = data.buffer.asUint8List();
      await song.writeAsBytes(bytes, flush: true);
    }
  }


  @override
  Widget build(BuildContext context) {
    return Material(
      child: Scaffold(
        body: Container(),
      ),
    );
  }
}

Flutter --version

Flutter 1.2.2 • channel dev • https://github.com/flutter/flutter.git
Framework • revision 007a415c2a (9 weeks ago) • 2019-02-21 20:22:47 -0800
Engine • revision f1f19bba8f
Tools • Dart 2.2.0 (build 2.2.0-dev.2.1 c92d5ca288)

when i run the example and try to pick a file from my music on a real iPhone (emulator doesn't work AFAIK, since you can't put songs on the emulator) nothing happens.

None of the songs get loaded into the player. In fact I can't even hit cancel to go back (edit 2: i can cancel if i hit it immediately, but if i try to select a song, then cancel, it hangs). Just stuck in the music file picker. so i have to manually close and restart the example (edit: apparently if i leave it long enough, it just crashes the app).

error output in the xcode console (not sure if i can get a flutter error since I'm running it on a real device):

https://pastebin.com/E44pCMFM

I'm testing the plugin on an Android device - tried to play the two given files (pi.mp3 and dubstep.mp3). but getting the StereoFileNotPlayableException. Tried reinstalling as per another issue but still the same error.

For other files, getting a PlatformException(error, null, null) exception.

Would appreciate some help getting around this. Thanks to @faku99 for working on a Flutter audio plugin - much needed!

I have tried to load the example and get this error:

E/MediaPlayerNative(20252): stop called in state 1, mPlayer(0x0)
E/MediaPlayerNative(20252): error (-38, 0)
V/MediaPlayer(20252): resetDrmState:  mDrmInfo=null mDrmProvisioningThread=null mPrepareDrmInProgress=false mActiveDrmScheme=false
V/MediaPlayer(20252): cleanDrmObj: mDrmObj=null mDrmSessionId=null
E/MethodChannel#com.twofind.stereo(20252): Failed to handle method call
E/MethodChannel#com.twofind.stereo(20252): java.lang.IllegalArgumentException
E/MethodChannel#com.twofind.stereo(20252): 	at android.media.MediaMetadataRetriever.setDataSource(MediaMetadataRetriever.java:74)
E/MethodChannel#com.twofind.stereo(20252): 	at com.twofind.stereo.AudioTrack.toJson(AudioTrack.java:14)
E/MethodChannel#com.twofind.stereo(20252): 	at com.twofind.stereo.StereoPlugin.load(StereoPlugin.java:155)
E/MethodChannel#com.twofind.stereo(20252): 	at com.twofind.stereo.StereoPlugin.onMethodCall(StereoPlugin.java:75)
E/MethodChannel#com.twofind.stereo(20252): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:191)
E/MethodChannel#com.twofind.stereo(20252): 	at io.flutter.view.FlutterNativeView.handlePlatformMessage(FlutterNativeView.java:152)
E/MethodChannel#com.twofind.stereo(20252): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#com.twofind.stereo(20252): 	at android.os.MessageQueue.next(MessageQueue.java:325)
E/MethodChannel#com.twofind.stereo(20252): 	at android.os.Looper.loop(Looper.java:142)
E/MethodChannel#com.twofind.stereo(20252): 	at android.app.ActivityThread.main(ActivityThread.java:6494)
E/MethodChannel#com.twofind.stereo(20252): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#com.twofind.stereo(20252): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
E/MethodChannel#com.twofind.stereo(20252): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
W/MediaPlayer(20252): mediaplayer went away with unhandled events