How can I play this function in background services in flutter - flutter

Question

How can I play this function in background services in flutter?
Kindly elaborate or also attach documentation or video link if possible.
I'm trying to play some music from a dependency named assets_audio_player.
I tried to use the didAppLifeCycleChange but in this way, I was facing a new
issuer it plays 2 songs. now I want to play songs directly in the background does not matter
app is in background or in foreground
void setupPlaylist() async {
await audioplayer.open(
showNotification: true,
Playlist(audios: [
Audio(
'assets/1.mp4',
metas: Metas(
title: "Bazz aa by YS",
artist: 'Talha',
image: const MetasImage.network(
'https://www.musicgrotto.com/wp-content/uploads/2021/09/best-songs-of-all-time-graphic-art.jpg'),
),
),
// Audio(SongsList[2].,
// metas: Metas(
// title: "Bazz01",
// artist: 'Talha',
// )),
Audio.network(
'https://audio-ssl.itunes.apple.com/itunes-assets/AudioPreview125/v4/09/17/bb/0917bbe1-58c3-6252-d00e-9b70d42ef5dc/mzaf_2269500085377778268.plus.aac.p.m4a',
metas: Metas(
id: 'Online',
title: 'Online',
artist: 'Florent Champigny',
album: 'OnlineAlbum',
// image: MetasImage.network('https://www.google.com')
image: const MetasImage.network(
'https://i.dawn.com/large/2021/09/61399fb500900.png'),
),
),
Audio(
'assets/2.mp4',
metas: Metas(
title: "Bazz aa by YS",
artist: 'Talha',
image: const MetasImage.network(
'https://www.musicgrotto.com/wp-content/uploads/2021/09/best-songs-of-all-time-graphic-art.jpg'),
),
),
Audio('assets/3.mp4',
metas: Metas(
title: "Bazz aa song",
artist: 'Talha',
image: const MetasImage.network(
'https://www.thenews.com.pk/assets/uploads/updates/2021-12-27/920292_6757937_hgjhj_updates.jpg'),
)),
Audio('assets/1.mp4',
metas: Metas(
title: "Bazz03",
artist: 'Talha',
image: const MetasImage.network(
'https://www.thenews.com.pk/assets/uploads/updates/2021-12-27/920292_6757937_hgjhj_updates.jpg'),
)),
]),
autoStart: true,
loopMode: LoopMode.playlist,
);
}