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

yarn add @picovoice/pvrecorder-node

Usage

Initialize and begin recording:

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:

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

const devices = PvRecorder.getAvailableDevices()

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

Read frames of audio:

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:

recorder.stop();

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

recorder.release();

Demos

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