Constants

React Track Player Web provides several constants for player states, events, capabilities, and repeat modes.

State

Enum representing the different states the player can be in.

import { State } from "react-track-player-web"

Constant	Description
State.None	Player is not initialized
State.Ready	Player is ready but not playing
State.Playing	Audio is playing
State.Paused	Playback is paused
State.Stopped	Playback is stopped (at start position)
State.Buffering	Player is buffering audio
State.Error	An error occurred

Example

import { State } from "react-track-player-web"

// Check if player is currently playing
if (TrackPlayer.getPlaybackState() === State.Playing) {
  console.log("Music is playing!")
}

Event

Enum representing the different events that can be emitted by the player.

import { Event } from "react-track-player-web"

Constant	Description	Event Data
Event.PlaybackState	Fired when the playback state changes	{ state: State }
Event.PlaybackTrackChanged	Fired when the current track changes	{ prevTrack: number | null, nextTrack: number | null }
Event.PlaybackProgressUpdated	Fired periodically with position updates	{ position: number, duration: number, buffered: number }
Event.PlaybackError	Fired when an error occurs during playback	{ error: string, code?: string }

Example

import { Event } from "react-track-player-web"

// Listen for playback errors
TrackPlayer.addEventListener(Event.PlaybackError, (data) => {
  console.error("Playback error:", data.error)
  if (data.code) {
    console.error("Error code:", data.code)
  }
})

// Listen for track changes
TrackPlayer.addEventListener(Event.PlaybackTrackChanged, (data) => {
  console.log("Track changed from", data.prevTrack, "to", data.nextTrack)
})

Capability

Enum representing the different capabilities that can be enabled for the player.

import { Capability } from "react-track-player-web"

Constant	Description
Capability.Play	Enable play functionality
Capability.Pause	Enable pause functionality
Capability.Stop	Enable stop functionality
Capability.Skip	Enable skip to any track in the queue
Capability.SkipToNext	Enable skip to next track
Capability.SkipToPrevious	Enable skip to previous track
Capability.SeekTo	Enable seeking to position
Capability.SeekBy	Enable seeking forward or backward by a relative amount of time
Capability.SetVolume	Enable volume control
Capability.SetRate	Enable playback rate control

Example

import { Capability } from "react-track-player-web"

// Setup player with specific capabilities
await TrackPlayer.setupPlayer({
  capabilities: [
    Capability.Play,
    Capability.Pause,
    Capability.SkipToNext,
    Capability.SkipToPrevious,
    Capability.SeekTo
  ]
})

RepeatMode

Enum representing the different repeat modes for playback.

import { RepeatMode } from "react-track-player-web"

Constant	Description
RepeatMode.Off	No repeat, play through queue once
RepeatMode.Track	Repeat the current track
RepeatMode.Queue	Repeat the entire queue

Example

import { RepeatMode } from "react-track-player-web"

// Set player to repeat the current track
await TrackPlayer.setRepeatMode(RepeatMode.Track)

// Check current repeat mode
const currentMode = TrackPlayer.getRepeatMode()
if (currentMode === RepeatMode.Queue) {
  console.log("Player is set to repeat the entire queue")
}

EqualizerFrequency

Type representing the standard 10-band equalizer frequencies in Hz.

import { EqualizerFrequency } from "react-track-player-web"

Frequency	Band Description
32	Sub-bass
64	Bass
125	Low mids
250	Midrange
500	Upper mids
1000	Presence
2000	Upper presence
4000	Brilliance
8000	Treble
16000	Air

Example

// Get all available frequencies
const frequencies = [32, 64, 125, 250, 500, 1000, 2000, 4000, 8000, 16000]

// Set gain for specific frequency
TrackPlayer.setEqualizerBandGain(0, 4) // Set 32Hz band to +4dB

EqualizerPreset

Type representing predefined equalizer configurations for different music genres.

import { EqualizerPreset } from "react-track-player-web"

Preset	Description
"flat"	No adjustments (0dB on all bands)
"rock"	Enhanced bass and treble for rock music
"pop"	Balanced with slight bass and treble boost
"jazz"	Smooth mid-range emphasis
"classical"	Natural sound with subtle enhancements
"electronic"	Heavy bass and crisp highs for electronic music
"vocal"	Mid-range boost for vocal clarity
"bass"	Heavy low-frequency emphasis
"treble"	High-frequency emphasis

Example

// Apply different presets
await TrackPlayer.setEqualizerPreset("rock")
await TrackPlayer.setEqualizerPreset("jazz")
await TrackPlayer.setEqualizerPreset("flat") // Reset to flat response