PvRecorder Binding for Node.js

PvRecorder

PvRecorder is an easy-to-use, cross-platform audio recorder designed for real-time speech audio processing. It allows developers access to an audio device's input stream, broken up into data frames of a given size.

Compatibility

- Node.js 18+
- Runs on Linux (x86_64), macOS (x86_64 and arm64), Windows (x86_64 and arm64), and Raspberry Pi (3, 4, 5).

Installation

``console
yarn add @picovoice/pvrecorder-node
`

Usage

Initialize and begin recording:

`javascript
const { PvRecorder } = require("@picovoice/pvrecorder-node");

const recorder = new PvRecorder(/frameLength/ 512);
recorder.start()
`

(or)

Use get_available_devices() to get a list of available devices and then initialize the instance based on the index of a device:

`javascript

const { PvRecorder } = require("@picovoice/pvrecorder-node");

const devices = PvRecorder.getAvailableDevices()

const recorder = new PvRecorder(512, /device index/0);
recorder.start()
`

Read frames of audio:

`javascript
while (recorder.isRecording) {
// const frame = recorder.readSync(), for synchronous calls
const frame = await recorder.read();
// process audio frame
}
`

To stop recording, call stop() on the instance:

`javascript
recorder.stop();
`

Once you are done, free the resources acquired by PvRecorder. You do not have to call stop() before release():

`javascript
recorder.release();
``

Demos

@picovoice/pvrecorder-node-demo provides command-line utilities for recording audio to a file.