Source: https://docs.expo.dev/versions/v52.0.0/sdk/audio

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Expo Audio (expo-audio)

GitHub Changelog npm

A library that provides an API to implement audio playback and recording in apps.

GitHub Changelog npm

Android

iOS

Web

Bundled version:

~0.3.5

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---

This page documents an upcoming version of the Audio library. Expo Audio is currently in alpha and subject to breaking changes.

expo-audio is a cross-platform audio library for accessing the native audio capabilities of the device.

Note that audio automatically stops if headphones/bluetooth audio devices are disconnected.

Installation

---

Terminal

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- npx expo install expo-audio

If you are installing this in an existing React Native app , make sure to install expo in your project.

Configuration in app config

---

You can configure expo-audio using its built-in config plugin if you use config plugins in your project (Continuous Native Generation (CNG) ). The plugin allows you to configure various properties that cannot be set at runtime and require building a new app binary to take effect. If your app does not use CNG, then you'll need to manually configure the library.

Example app.json with config plugin

app.json

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{ "expo": { "plugins": [ [ "expo-audio", { "microphonePermission": "Allow $(PRODUCT_NAME) to access your microphone." } ] ] } }

Configurable properties

| Name | Default | Description | | --- | --- | --- | | microphonePermission | "Allow $(PRODUCT_NAME) to access your microphone" | Only for: <br><br>iOS<br><br> <br><br>A string to set the NSMicrophoneUsageDescription<br> permission message. |

Usage

---

Playing sounds

Playing sounds

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Open in Snack

import { View, StyleSheet, Button } from 'react-native'; import { useAudioPlayer } from 'expo-audio'; const audioSource = require('./assets/Hello.mp3'); export default function App() { const player = useAudioPlayer(audioSource); return ( <View style={styles.container}> <Button title="Play Sound" onPress={() => player.play()} /> </View> ); } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', backgroundColor: '#ecf0f1', padding: 10, }, });

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Recording sounds

Recording sounds

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Open in Snack

import { useState } from 'react'; import { View, StyleSheet, Button } from 'react-native'; import { useAudioRecorder, AudioModule, RecordingPresets } from 'expo-audio'; export default function App() { const audioRecorder = useAudioRecorder(RecordingPresets.HIGH_QUALITY); const record = async () => { await audioRecorder.prepareToRecordAsync(); audioRecorder.record(); }; const stopRecording = async () => { // The recording will be available on `audioRecorder.uri`. await audioRecorder.stop(); }; useEffect(() => { (async () => { const status = await AudioModule.requestRecordingPermissionsAsync(); if (!status.granted) { Alert.alert('Permission to access microphone was denied'); } })(); }, []); return ( <View style={styles.container}> <Button title={audioRecorder.isRecording ? 'Stop Recording' : 'Start Recording'} onPress={audioRecorder.isRecording ? stopRecording : record} /> </View> ); } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', backgroundColor: '#ecf0f1', padding: 10, }, });

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Playing or recording audio in background 

iOS

On iOS, audio playback and recording in background is only available in standalone apps, and it requires some extra configuration. On iOS, each background feature requires a special key in UIBackgroundModes array in your Info.plist file. In standalone apps this array is empty by default, so to use background features you will need to add appropriate keys to your app.json configuration.

See an example of app.json that enables audio playback in background:

{ "expo": { ... "ios": { ... "infoPlist": { ... "UIBackgroundModes": [ "audio" ] } } } }

Notes on web usage

• A MediaRecorder issue on Chrome produces WebM files missing the duration metadata. See the open Chromium issue .
• MediaRecorder encoding options and other configurations are inconsistent across browsers, utilizing a Polyfill such as kbumsik/opus-media-recorder or ai/audio-recorder-polyfill in your application will improve your experience. Any options passed to prepareToRecordAsync will be passed directly to the MediaRecorder API and as such the polyfill.
• Web browsers require sites to be served securely for them to listen to a mic. See MediaDevices getUserMedia() security for more details.

API

---

import { useAudioPlayer, useAudioRecorder } from 'expo-audio';

Constants

---

Audio.AUDIO_SAMPLE_UPDATE

Android

iOS

Web

Type: 'audioSampleUpdate'

Audio.PLAYBACK_STATUS_UPDATE

Android

iOS

Web

Type: 'playbackStatusUpdate'

Audio.RECORDING_STATUS_UPDATE

Android

iOS

Web

Type: 'recordingStatusUpdate'

Audio.RecordingPresets

Android

iOS

Web

Type: Record<string, [RecordingOptions](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingoptions) >

Constant which contains definitions of the two preset examples of RecordingOptions, as implemented in the Audio SDK.

HIGH_QUALITY

RecordingPresets.HIGH_QUALITY = { extension: '.m4a', sampleRate: 44100, numberOfChannels: 2, bitRate: 128000, android: { outputFormat: 'mpeg4', audioEncoder: 'aac', }, ios: { outputFormat: IOSOutputFormat.MPEG4AAC, audioQuality: AudioQuality.MAX, linearPCMBitDepth: 16, linearPCMIsBigEndian: false, linearPCMIsFloat: false, }, web: { mimeType: 'audio/webm', bitsPerSecond: 128000, }, };

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LOW_QUALITY

RecordingPresets.LOW_QUALITY = { extension: '.m4a', sampleRate: 44100, numberOfChannels: 2, bitRate: 64000, android: { extension: '.3gp', outputFormat: '3gp', audioEncoder: 'amr_nb', }, ios: { audioQuality: AudioQuality.MIN, outputFormat: IOSOutputFormat.MPEG4AAC, linearPCMBitDepth: 16, linearPCMIsBigEndian: false, linearPCMIsFloat: false, }, web: { mimeType: 'audio/webm', bitsPerSecond: 128000, }, };

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Hooks

---

useAudioPlayer(source, updateInterval)

Android

iOS

Web

| Parameter | Type | | --- | --- | | source(optional) | number \| [AudioSource](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiosource) | | updateInterval(optional) | number |

Returns:

[AudioPlayer](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audioplayer)

useAudioPlayerStatus(player)

Android

iOS

Web

| Parameter | Type | | --- | --- | | player | [AudioPlayer](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audioplayer) |

Returns:

[AudioStatus](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiostatus)

useAudioRecorder(options, statusListener)

Android

iOS

Web

| Parameter | Type | | --- | --- | | options | [RecordingOptions](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingoptions) | | statusListener(optional) | (status: [RecordingStatus](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingstatus) ) => void |

Returns:

[AudioRecorder](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiorecorder)

useAudioRecorderState(recorder, interval)

Android

iOS

Web

| Parameter | Type | | --- | --- | | recorder | [AudioRecorder](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiorecorder) | | interval(optional) | number |

Returns:

[RecorderState](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recorderstate)

useAudioSampleListener(player, listener)

Android

iOS

Web

| Parameter | Type | | --- | --- | | player | [AudioPlayer](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audioplayer) | | listener | (data: [AudioSample](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiosample) ) => void |

Returns:

void

Classes

---

AudioPlayer

Android

iOS

Web

Type: Class extends [SharedObject](https://docs.expo.dev/versions/v52.0.0/sdk/expo#sharedobject) <[AudioEvents](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audioevents) >

AudioPlayer Properties

currentTime

Android

iOS

Web

Type: number

The current position through the audio item, in seconds.

duration

Android

iOS

Web

Type: number

The total duration of the audio in seconds.

id

Android

iOS

Web

Type: number

Unique identifier for the player object.

isAudioSamplingSupported

Android

iOS

Web

Type: boolean

Boolean value indicating whether audio sampling is supported on the platform.

isBuffering

Android

iOS

Web

Type: boolean

Boolean value indicating whether the player is buffering.

isLoaded

Android

iOS

Web

Type: boolean

Boolean value indicating whether the player is finished loading.

loop

Android

iOS

Web

Type: boolean

Boolean value indicating whether the player is currently looping.

muted

Android

iOS

Web

Type: boolean

Boolean value indicating whether the player is currently muted.

paused

Android

iOS

Web

Type: boolean

Boolean value indicating whether the player is currently paused.

playbackRate

Android

iOS

Web

Type: number

The current playback rate of the audio.

playing

Android

iOS

Web

Type: boolean

Boolean value indicating whether the player is currently playing.

shouldCorrectPitch

Android

iOS

Web

Type: boolean

A boolean describing if we are correcting the pitch for a changed rate.

volume

Android

iOS

Web

Type: number

The current volume of the audio.

AudioPlayer Methods

pause()

Android

iOS

Web

Pauses the player.

Returns:

void

play()

Android

iOS

Web

Start playing audio.

Returns:

void

remove()

Android

iOS

Web

Remove the player from memory to free up resources.

Returns:

void

replace(source)

Android

iOS

Web

| Parameter | Type | | --- | --- | | source | [AudioSource](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiosource) |

Replaces the current audio source with a new one.

Returns:

void

seekTo(seconds)

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | seconds | number | The number of seconds to seek by. |

Seeks the playback by the given number of seconds.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

setPlaybackRate(rate, pitchCorrectionQuality)

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | rate | number | The playback rate of the audio. | | pitchCorrectionQuality(optional) | [PitchCorrectionQuality](https://docs.expo.dev/versions/v52.0.0/sdk/audio#pitchcorrectionquality) | The quality of the pitch correction. |

Sets the current playback rate of the audio.

Returns:

void

AudioRecorder

Android

iOS

Web

Type: Class extends [SharedObject](https://docs.expo.dev/versions/v52.0.0/sdk/expo#sharedobject) <[RecordingEvents](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingevents) >

AudioRecorder Properties

currentTime

Android

iOS

Web

Type: number

The current length of the recording, in seconds.

id

Android

iOS

Web

Type: number

Unique identifier for the recorder object.

isRecording

Android

iOS

Web

Type: boolean

Boolean value indicating whether the recording is in progress.

uri

Android

iOS

Web

Literal type: union

The uri of the recording.

Acceptable values are: null | string

AudioRecorder Methods

getAvailableInputs()

Android

iOS

Web

Returns a list of available recording inputs. This method can only be called if the Recording has been prepared.

Returns:

[RecordingInput[]](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordinginput)

A Promise that is fulfilled with an array of RecordingInput objects.

getCurrentInput()

Android

iOS

Web

Returns the currently-selected recording input. This method can only be called if the Recording has been prepared.

Returns:

[RecordingInput](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordinginput)

A Promise that is fulfilled with a RecordingInput object.

getStatus()

Android

iOS

Web

Status of the current recording.

Returns:

[RecorderState](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recorderstate)

pause()

Android

iOS

Web

Pause the recording.

Returns:

void

prepareToRecordAsync(options)

Android

iOS

Web

| Parameter | Type | | --- | --- | | options(optional) | [Partial](https://www.typescriptlang.org/docs/handbook/utility-types.html#partialtype) <[RecordingOptions](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingoptions) > |

Prepares the recording for recording.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

record()

Android

iOS

Web

Starts the recording.

Returns:

void

recordForDuration(seconds)

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | seconds | number | The time in seconds to stop recording at. |

Stops the recording once the specified time has elapsed.

Returns:

void

setInput(inputUid)

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | inputUid | string | The uid of a RecordingInput. |

Sets the current recording input.

Returns:

void

A Promise that is resolved if successful or rejected if not.

startRecordingAtTime(seconds)

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | seconds | number | The time in seconds to start recording at. |

Starts the recording at the given time.

Returns:

void

stop()

Android

iOS

Web

Stop the recording.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

Methods

---

Audio.getRecordingPermissionsAsync()

Android

iOS

Web

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <PermissionResponse>

Audio.requestRecordingPermissionsAsync()

Android

iOS

Web

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <PermissionResponse>

Audio.setAudioModeAsync(mode)

Android

iOS

Web

| Parameter | Type | | --- | --- | | mode | [Partial](https://www.typescriptlang.org/docs/handbook/utility-types.html#partialtype) <[AudioMode](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiomode) > |

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

Audio.setIsAudioActiveAsync(active)

Android

iOS

Web

| Parameter | Type | | --- | --- | | active | boolean |

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

Event Subscriptions

---

Audio.useAudioSampleListener(player, listener)

Android

iOS

Web

| Parameter | Type | | --- | --- | | player | [AudioPlayer](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audioplayer) | | listener | (data: [AudioSample](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiosample) ) => void |

Returns:

void

Interfaces

---

PermissionResponse

Android

iOS

Web

An object obtained by permissions get and request functions.

| Property | Type | Description | | --- | --- | --- | | canAskAgain | boolean | Indicates if user can be asked again for specific permission. If not, one should be directed to the Settings app in order to enable/disable the permission. | | expires | [PermissionExpiration](https://docs.expo.dev/versions/v52.0.0/sdk/audio#permissionexpiration) | Determines time when the permission expires. | | granted | boolean | A convenience boolean that indicates if the permission is granted. | | status | [PermissionStatus](https://docs.expo.dev/versions/v52.0.0/sdk/audio#permissionstatus) | Determines the status of the permission. |

Types

---

AndroidAudioEncoder

Android

iOS

Web

Literal Type: string

Acceptable values are: 'default' | 'amr_nb' | 'amr_wb' | 'aac' | 'he_aac' | 'aac_eld'

AndroidOutputFormat

Android

iOS

Web

Literal Type: string

Acceptable values are: 'default' | '3gp' | 'mpeg4' | 'amrnb' | 'amrwb' | 'aac_adts' | 'mpeg2ts' | 'webm'

AudioEvents

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | audioSampleUpdate | (data: [AudioSample](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiosample) ) => void | - | | playbackStatusUpdate | (status: [AudioStatus](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiostatus) ) => void | - |

AudioMode

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | allowsRecording | boolean | - | | interruptionMode | [InterruptionMode](https://docs.expo.dev/versions/v52.0.0/sdk/audio#interruptionmode) | - | | playsInSilentMode | boolean | - | | shouldPlayInBackground | boolean | - | | shouldRouteThroughEarpiece | boolean | - |

AudioSample

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | channels | [AudioSampleChannel[]](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audiosamplechannel) | - | | timestamp | number | - |

AudioSampleChannel

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | frames | number[] | - |

AudioSource

Android

iOS

Web

Type: string or null or object shaped as below:

| Property | Type | Description | | --- | --- | --- | | headers(optional) | Record<string, string> | An object representing the HTTP headers to send along with the request for a remote audio source. On web requires the Access-Control-Allow-Origin header returned by the server to include the current domain. | | uri(optional) | string | A string representing the resource identifier for the audio, which could be an HTTPS address, a local file path, or the name of a static audio file resource. |

AudioStatus

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | currentTime | number | - | | duration | number | - | | id | number | - | | isBuffering | boolean | - | | isLoaded | boolean | - | | loop | boolean | - | | mute | boolean | - | | playbackRate | number | - | | playbackState | string | - | | playing | boolean | - | | reasonForWaitingToPlay | string | - | | shouldCorrectPitch | boolean | - | | timeControlStatus | string | - |

BitRateStrategy

Android

iOS

Web

Literal Type: string

Acceptable values are: 'constant' | 'longTermAverage' | 'variableConstrained' | 'variable'

InterruptionMode

Android

iOS

Web

Literal Type: string

Acceptable values are: 'mixWithOthers' | 'doNotMix' | 'duckOthers'

PermissionExpiration

Android

iOS

Web

Literal Type: union

Permission expiration time. Currently, all permissions are granted permanently.

Acceptable values are: 'never' | number

PitchCorrectionQuality

Android

iOS

Web

Literal Type: string

Acceptable values are: 'low' | 'medium' | 'high'

RecorderState

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | canRecord | boolean | - | | durationMillis | number | - | | isRecording | boolean | - | | mediaServicesDidReset | boolean | - | | metering(optional) | number | - | | url | string \| null | - |

RecordingEvents

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | recordingStatusUpdate | (status: [RecordingStatus](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingstatus) ) => void | - |

RecordingInput

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | name | string | - | | type | string | - | | uid | string | - |

RecordingOptions

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | android | [RecordingOptionsAndroid](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingoptionsandroid) | Recording options for the Android platform. | | bitRate | number | The desired bit rate.<br><br>Example<br><br>128000 | | extension | string | The desired file extension.<br><br>Example<br><br>.caf | | ios | [RecordingOptionsIos](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingoptionsios) | Recording options for the iOS platform. | | numberOfChannels | number | The desired number of channels.<br><br>Example<br><br>2 | | sampleRate | number | The desired sample rate.<br><br>Example<br><br>44100 | | web(optional) | [RecordingOptionsWeb](https://docs.expo.dev/versions/v52.0.0/sdk/audio#recordingoptionsweb) | Recording options for the Web platform. |

RecordingOptionsAndroid

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | audioEncoder | [AndroidAudioEncoder](https://docs.expo.dev/versions/v52.0.0/sdk/audio#androidaudioencoder) | The desired audio encoder. See the AndroidAudioEncoder<br> enum for all valid values. | | extension(optional) | string | The desired file extension.<br><br>Example<br><br>.caf | | maxFileSize(optional) | number | The desired maximum file size in bytes, after which the recording will stop (but stopAndUnloadAsync() must still be called after this point).<br><br>Example<br><br>65536 | | outputFormat | [AndroidOutputFormat](https://docs.expo.dev/versions/v52.0.0/sdk/audio#androidoutputformat) | The desired file format. See the AndroidOutputFormat<br> enum for all valid values. | | sampleRate(optional) | number | The desired sample rate.<br><br>Example<br><br>44100 |

RecordingOptionsIos

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | audioQuality | [AudioQuality](https://docs.expo.dev/versions/v52.0.0/sdk/audio#audioquality) \| number | The desired audio quality. See the AudioQuality<br> enum for all valid values. | | bitDepthHint(optional) | number | The desired bit depth hint.<br><br>Example<br><br>16 | | bitRateStrategy(optional) | number | The desired bit rate strategy. See the next section for an enumeration of all valid values of bitRateStrategy. | | extension(optional) | string | The desired file extension.<br><br>Example<br><br>.caf | | linearPCMBitDepth(optional) | number | The desired PCM bit depth.<br><br>Example<br><br>16 | | linearPCMIsBigEndian(optional) | boolean | A boolean describing if the PCM data should be formatted in big endian. | | linearPCMIsFloat(optional) | boolean | A boolean describing if the PCM data should be encoded in floating point or integral values. | | outputFormat(optional) | string \| [IOSOutputFormat](https://docs.expo.dev/versions/v52.0.0/sdk/audio#iosoutputformat) \| number | The desired file format. See the IOSOutputFormat<br> enum for all valid values. | | sampleRate(optional) | number | The desired sample rate.<br><br>Example<br><br>44100 |

RecordingOptionsWeb

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | bitsPerSecond(optional) | number | - | | mimeType(optional) | string | - |

RecordingStatus

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | error | string \| null | - | | hasError | boolean | - | | id | number | - | | isFinished | boolean | - | | url | string \| null | - |

Enums

---

AudioQuality

Android

iOS

Web

MIN

AudioQuality.MIN ＝ 0

LOW

AudioQuality.LOW ＝ 32

MEDIUM

AudioQuality.MEDIUM ＝ 64

HIGH

AudioQuality.HIGH ＝ 96

MAX

AudioQuality.MAX ＝ 127

IOSOutputFormat

Android

iOS

Web

MPEGLAYER1

IOSOutputFormat.MPEGLAYER1 ＝ ".mp1"

MPEGLAYER2

IOSOutputFormat.MPEGLAYER2 ＝ ".mp2"

MPEGLAYER3

IOSOutputFormat.MPEGLAYER3 ＝ ".mp3"

MPEG4AAC

IOSOutputFormat.MPEG4AAC ＝ "aac "

MPEG4AAC_ELD

IOSOutputFormat.MPEG4AAC_ELD ＝ "aace"

MPEG4AAC_ELD_SBR

IOSOutputFormat.MPEG4AAC_ELD_SBR ＝ "aacf"

MPEG4AAC_ELD_V2

IOSOutputFormat.MPEG4AAC_ELD_V2 ＝ "aacg"

MPEG4AAC_HE

IOSOutputFormat.MPEG4AAC_HE ＝ "aach"

MPEG4AAC_LD

IOSOutputFormat.MPEG4AAC_LD ＝ "aacl"

MPEG4AAC_HE_V2

IOSOutputFormat.MPEG4AAC_HE_V2 ＝ "aacp"

MPEG4AAC_SPATIAL

IOSOutputFormat.MPEG4AAC_SPATIAL ＝ "aacs"

AC3

IOSOutputFormat.AC3 ＝ "ac-3"

AES3

IOSOutputFormat.AES3 ＝ "aes3"

APPLELOSSLESS

IOSOutputFormat.APPLELOSSLESS ＝ "alac"

ALAW

IOSOutputFormat.ALAW ＝ "alaw"

AUDIBLE

IOSOutputFormat.AUDIBLE ＝ "AUDB"

60958AC3

IOSOutputFormat.60958AC3 ＝ "cac3"

MPEG4CELP

IOSOutputFormat.MPEG4CELP ＝ "celp"

ENHANCEDAC3

IOSOutputFormat.ENHANCEDAC3 ＝ "ec-3"

MPEG4HVXC

IOSOutputFormat.MPEG4HVXC ＝ "hvxc"

ILBC

IOSOutputFormat.ILBC ＝ "ilbc"

APPLEIMA4

IOSOutputFormat.APPLEIMA4 ＝ "ima4"

LINEARPCM

IOSOutputFormat.LINEARPCM ＝ "lpcm"

MACE3

IOSOutputFormat.MACE3 ＝ "MAC3"

MACE6

IOSOutputFormat.MACE6 ＝ "MAC6"

AMR

IOSOutputFormat.AMR ＝ "samr"

AMR_WB

IOSOutputFormat.AMR_WB ＝ "sawb"

DVIINTELIMA

IOSOutputFormat.DVIINTELIMA ＝ 1836253201

MICROSOFTGSM

IOSOutputFormat.MICROSOFTGSM ＝ 1836253233

QUALCOMM

IOSOutputFormat.QUALCOMM ＝ "Qclp"

QDESIGN2

IOSOutputFormat.QDESIGN2 ＝ "QDM2"

QDESIGN

IOSOutputFormat.QDESIGN ＝ "QDMC"

MPEG4TWINVQ

IOSOutputFormat.MPEG4TWINVQ ＝ "twvq"

ULAW

IOSOutputFormat.ULAW ＝ "ulaw"

PermissionStatus

Android

iOS

Web

DENIED

PermissionStatus.DENIED ＝ "denied"

User has denied the permission.

GRANTED

PermissionStatus.GRANTED ＝ "granted"

User has granted the permission.

UNDETERMINED

PermissionStatus.UNDETERMINED ＝ "undetermined"

User hasn't granted or denied the permission yet.