What to use instead of AudioPlaybackState, cannot find the documentation

Question

I was looking at a clients app but I cannot find the solution. It was a really old code and I have updated the just_audio plugin to the latest version and i am getting errors in the code below I don't know what to do. I understand the mapping but I don't know what to write instead of "AudioPlaybackState".

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:just_audio/just_audio.dart';
import 'package:online_radio/radio/radio_player.dart';
import 'package:online_radio/radio/radio_state.dart';

class JustAudioPlayer extends RadioPlayer {
  final AudioPlayer _audioPlayer = AudioPlayer();
  Stream<RadioState> radioStateStream;

  JustAudioPlayer() {
    radioStateStream = _audioPlayer.playbackStateStream.map(_mapToRadioState);
  }

  @override
  Future<void> setUrl(String url) async {
    return _audioPlayer.setUrl(url);
  }

  @override
  Future<void> play({@required String url}) async {
    return _audioPlayer.play();
  }

  @override
  Future<void> pause() {
    return _audioPlayer.pause();
  }

  RadioState _mapToRadioState(AudioPlaybackState audioState) {
    switch (audioState) {
      case AudioPlaybackState.none:
      case AudioPlaybackState.stopped:
        return RadioState.STOPPED;
      case AudioPlaybackState.paused:
        return RadioState.PAUSED;
      case AudioPlaybackState.playing:
        return RadioState.PLAYING;
      default:
        return RadioState.UNKNOWN;
    }
  }
}

These are the errors i am getting:

score 1 · Accepted Answer · answered Jun 26 '22 at 21:37

This is probably something you could have found by reading their current documentation. Specifically this section (https://github.com/ryanheise/just_audio/tree/minor/just_audio#working-with-state-streams):

player.playerStateStream.listen((state) {
  if (state.playing) ... else ...
  switch (state.processingState) {
    case ProcessingState.idle: ...
    case ProcessingState.loading: ...
    case ProcessingState.buffering: ...
    case ProcessingState.ready: ...
    case ProcessingState.completed: ...
  }
});

// See also:
// - durationStream
// - positionStream
// - bufferedPositionStream
// - sequenceStateStream
// - sequenceStream
// - currentIndexStream
// - icyMetadataStream
// - playingStream
// - processingStateStream
// - loopModeStream
// - shuffleModeEnabledStream
// - volumeStream
// - speedStream
// - playbackEventStream

As you can see there are now multiple streams which can be used to achieve the same behaviour as before:

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:just_audio/just_audio.dart';
import 'package:online_radio/radio/radio_player.dart';
import 'package:online_radio/radio/radio_state.dart';

class JustAudioPlayer extends RadioPlayer {
  final AudioPlayer _audioPlayer = AudioPlayer();
  Stream<RadioState> radioStateStream;

  JustAudioPlayer() {
    radioStateStream = _audioPlayer.playerStateStream.map(_mapToRadioState);
  }

  @override
  Future<void> setUrl(String url) async {
    return _audioPlayer.setUrl(url);
  }

  @override
  Future<void> play({@required String url}) async {
    return _audioPlayer.play();
  }

  @override
  Future<void> pause() {
    return _audioPlayer.pause();
  }

  RadioState _mapToRadioState(PlayerState playerState) {
    final processingState = playerState?.processingState;
    final playing = playerState?.playing;


    if (playing == true) return RadioState.PLAYING;
    if (processingState == ProcessingState.completed || 
         processingState == ProcessingState.idle) return RadioState.STOPPED;
    if (processingState == ProcessingState.ready) return RadioState.PAUSED;
    return RadioState.UNKNOWN;
    }
  }
}

Please note: This code was not tested and you should do more testing to make sure that it works in the way you need it.

What to use instead of AudioPlaybackState, cannot find the documentation

1 Answers1