AudioBufferBaseSourceNode

The AudioBufferBaseSourceNode interface is an AudioScheduledSourceNode which aggregates behavior of nodes that requires AudioBuffer.

Child classes:

• AudioBufferSourceNode
• AudioBufferQueueSourceNode

Properties

It inherits all properties from AudioScheduledSourceNode.

Name	Type	Description
detune	AudioParam	k-rate AudioParam representing detuning of oscillation in cents.
playbackRate	AudioParam	k-rate AudioParam defining speed factor at which the audio will be played.

Methods

AudioBufferBaseSourceNode does not define any additional methods. It inherits all methods from AudioScheduledSourceNode.

Events

onPositionChanged

Mobile only

Allow to set (or remove) callback that will be fired after processing certain part of an audio. Frequency is defined by onPositionChangedInterval. By setting this callback you can achieve pause functionality. You can remove callback by passing null.

onPositionChangedInterval

Mobile only

Allow to set frequency for onPositionChanged event. Value that can be set is around 1000/x Hz.

import { AudioContext, AudioBufferSourceNode } from 'react-native-audio-api';

function App() {
    const ctx = new AudioContext();
    const sourceNode = ctx.createBufferSource();
    sourceNode.buffer = null; //set your buffer
    let offset = 0;

    sourceNode.onPositionChanged = (event) => { //setting callback
        this.offset = event.value;
    };

    sourceNode.onPositionChangedInterval = 100; //setting frequency to ~10Hz

    sourceNode.start();
}

Remarks

detune

• Default value is 0.0.
• Nominal range is -∞ to ∞.
• For example value of 100 detune the source up by one semitone, whereas -1200 down by one octave.
• When createBufferSource(true) it is clamped to range -1200 to 1200.

playbackRate

• Default value is 1.0.
• Nominal range is -∞ to ∞.
• For example value of 1.0 plays audio at normal speed, whereas value of 2.0 plays audio twice as fast as normal speed.
• When created with createBufferSource(true) it is clamped to range 0 to 3 and uses pitch correction algorithm.