react-native-voice-changer

react-native-voice-changer is a wrapper of un4seen Bass a native voice processing library

Demo

Playstore

Getting started

$ npm install react-native-voice-changer --save

Mostly automatic installation

For RN >=0.60 linking is automatic, else:
$ react-native link react-native-voice-changer

Android permissions

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />

You may use react-native-permissions to grant permissions

Usage

Example

Full example for Android

import voiceChanger from 'react-native-voice-changer';

const effects = [
          {
              id: 1,
              icon: require('./icons/default_fx.png'),
              name: "helium",
              pitch: 10,
              rate: 0,
              reverb: []
          },
          {
              id: "3",
              icon: require('./icons/default_fx.png'),
              name: "Robot",
              pitch: 3,
              rate: 5,
              amplify: 10,
              echo: [100, 100, 40]
          },
          {
              id: "4",
              icon: require('./icons/default_fx.png'),
              name: "Cave",
              pitch: 0,
              rate: 0,
              reverb: [-3.25, 2000, 0.8]
          },
      ];

class VoiceChangerExample extends Component {
    componentDidMount() {
        this.initMedia();
    }
        
    initMedia = () => {
      voiceChanger.setPath(AudioUtils.DocumentDirectoryPath + '/record.wav');
      voiceChanger.createDBMedia();
      effects.forEach(e => voiceChanger.insertEffect(JSON.stringify(e)));
    };
    
    onPlay = (idx) => {
        voiceChanger.playEffect(idx)
    };
    
    onSave = (idx) => {
        voiceChanger
        .saveEffect(idx)
        .then(path => {
            console.log('Saved to: ', path);
            /* Do something with your saved file */
        });
    };
  ...
}

API

Method	Description
VoiceChanger.setPath(path)	Set current path of media to be processed
VoiceChanger.createOutputDir	Create folder to save processed media
VoiceChanger.createDBMedia	Prepare media player
VoiceChanger.insertEffect(effect)	Add effect to effects list
VoiceChanger.playEffect(effectIndex)	Play specified effect by index
VoiceChanger.saveEffect(effectIdx)	Save processed media with a specific effect

EFFECTS

Effect object has the following properties

Property	Type	Decription
pitch:	Int	The pitch of a channel, [-60...0...+60] semitones.
rate:	float	The tempo of a channel, [-95...0...+5000] percents.
reverb:	[fReverbMix, fReverbTime, fHighFreqRTRatio]	fReverbMix: Reverb mix, in dB, in the range from -96 through 0. The default value is 0 dB. fReverbTime: Reverb time, in milliseconds, in the range from 0.001 through 3000. The default value is 1000. fHighFreqRTRatio: High-frequency reverb time ratio, in the range from 0.001 through 0.999. The default value is 0.001.
filter:	[lFilter, fCenter, fBandwidth]	lFilter: Defines which BiQuad filter should be used. Filters list fCenter: Cut-off frequency (Center in PEAKINGEQ and Shelving filters) in Hz (1...info.freq/2). Default = 200Hz. fBandwidth: Bandwidth in octaves (0.1...4...n), Q is not in use (fBandwidth has priority over fQ). Default = 1 (0=not in use).
flanger:	[fWetDryMix, fDepth, fFeedback, fDelay, lPhase, fFrequency]	fWetDryMix: Ratio of wet (processed) signal to dry (unprocessed) signal. Must be in the range from 0 through 100 (all wet). The default value is 50. fDepth: Percentage by which the delay time is modulated by the low-frequency oscillator (LFO). Must be in the range from 0 through 100. The default value is 100. fFeedback: Percentage of output signal to feed back into the effect's input, in the range from -99 to 99. The default value is -50. fDelay: Number of milliseconds the input is delayed before it is played back, in the range from 0 to 4. The default value is 2 ms. lPhase: Phase differential between left and right LFOs, one of BASS_DX8_PHASE_NEG_180, BASS_DX8_PHASE_NEG_90, BASS_DX8_PHASE_ZERO, BASS_DX8_PHASE_90 and BASS_DX8_PHASE_180. The default value is BASS_DX8_PHASE_ZERO. fFrequency: Frequency of the LFO, in the range from 0 to 10. The default value is 0.25.
chorus:	[fDryMix, fWetMix, fFeedback, fMinSweep, fMaxSweep, fRate]	fDryMix: Dry (unaffected) signal mix (-2...+2). Default = 0. fWetMix: Wet (affected) signal mix (-2...+2). Default = 0. fFeedback: Feedback (-1...+1). Default = 0. fMinSweep: Minimum delay in ms (0<...6000). Default = 0. fMaxSweep: Maximum delay in ms (0<...6000). Default = 0. fRate: Rate in ms/s (0<...1000). Default = 0.
distort:	[fEdge, fGain, fPostEQBandwidth, fPostEQCenterFrequency, fPreLowpassCutoff]	fEdge: Percentage of distortion intensity, in the range in the range from 0 through 100. The default value is 15 percent. fGain: Amount of signal change after distortion, in the range from -60 through 0. The default value is -18 dB. fPostEQBandwidth: Width of frequency band that determines range of harmonic content addition, in the range from 100 through 8000. The default value is 2400 Hz. fPostEQCenterFrequency: Center frequency of harmonic content addition, in the range from 100 through 8000. The default value is 2400 Hz. fPreLowpassCutoff: Filter cutoff for high-frequency harmonics attenuation, in the range from 100 through 8000. The default value is 8000 Hz.
reverse:	boolean	Reverse playback direction
echo:	[fLeftDelay, fRightDelay, fFeedback, fWetDryMix]	fLeftDelay: Delay for left channel, in milliseconds, in the range from 1 through 2000. The default value is 500 ms. fRightDelay: Delay for right channel, in milliseconds, in the range from 1 through 2000. The default value is 500 ms. fFeedback: Percentage of output fed back into input, in the range from 0 through 100. The default value is 50. fWetDryMix: Ratio of wet (processed) signal to dry (unprocessed) signal. Must be in the range from 0 through 100 (all wet). The default value is 50.
echo4:	[fDryMix, fWetMix, fFeedback, fDelay]	fDryMix: Dry (unaffected) signal mix (-2...+2). Default = 0. fWetMix: Wet (affected) signal mix (-2...+2). Default = 0. fFeedback: Percentage of output signal to feed back into the effect's input, in the range from -99 to 99. The default value is -50. fDelay: Delay in seconds (0<...6). Default = 0.
eq1:	[fCenter, fBandwidth, fGain]	fCenter: Center frequency, in hertz. fBandwidth: Bandwidth, in semitones, in the range from 1 to 36. The default value is 12. fGain: Gain, in the range from -15 to 15. The default value is 0 dB.
eq2:	[fCenter, fBandwidth, fGain]	Same as eq1
eq3:	[fCenter, fBandwidth, fGain]	Same as eq1
amplify:	float	Amplification level (0...1...n, linear). Default = 0.
rotate:	float	Rotation rate/speed in Hz (A negative rate can be used for reverse direction).
phaser:	[fDryMix, fWetMix, fFeedback, fRate, fRange, fFreq]	fDryMix: Dry (unaffected) signal mix (-2...+2). Default = 0. fWetMix: Wet (affected) signal mix (-2...+2). Default = 0. fFeedback: Feedback (-1...+1). Default = 0. fRate: Rate of sweep in cycles per second (0<...<10). Default = 0. fRange: Sweep range in octaves (0<...<10). Default = 0. fFreq: Base frequency of sweep range (0<...1000). Default = 0.
autoWah:	[fDryMix, fWetMix, fFeedback, fRate, fRange, fFreq]	Same as phaser
compressor:	[fGain, fThreshold, fRatio, fAttack, fRelease]	fGain: Output gain in dB of signal after compression, in the range from -60 to 60. The default value is 5 dB. fThreshold: Point in dB at which compression begins, in decibels, in the range from -60 to 0. The default value is -15 dB. fRatio: Compression ratio, in the range from 1 to 100. The default value is 3, which means 3:1 compression. fAttack: Time in ms before compression reaches its full value, in the range from 0.01 to 500. The default value is 20 ms. fRelease: Time (speed) in ms at which compression is stopped after input drops below fThreshold, in the range from 50 to 3000. The default value is 200 ms.

Resources

• Un4seen
• BassFX Effects