Audify.js

Audify.js - Play/Stream/Record PCM audio data & Encode/Decode Opus to PCM audio data

Features

- Encode 16-bit integer PCM or floating point PCM to Opus packet using C++ Opus library.
- Decode Opus packets to 16-bit integer PCM or floating point PCM using C++ Opus library.
- Complete API for realtime audio input/output across Linux (native ALSA, JACK, PulseAudio and OSS), Macintosh OS X (CoreAudio and JACK), and Windows (DirectSound, ASIO and WASAPI) operating systems using C++ RtAudio library.

Installation

``
npm install audify
`

_Most regular installs will support prebuilds that are built with each release._

_Prebuilds are available for Node/Electron versions that support N-API 5-9._

#### Requirements for source build

- Node or Electron versions that support N-API 5 and up (N-API Node Version Matrix)
- CMake
- A proper C/C++ compiler toolchain of the given platform
- Windows:
- Visual C++ Build Tools or a recent version of Visual C++ will do (the free Community version works well)
- Unix/Posix:
- Clang or GCC
- Ninja or Make (Ninja will be picked if both present)

Example

#### Opus Encode & Decode

`javascript
const { OpusEncoder, OpusDecoder, OpusApplication } = require("audify");

// Init encoder and decoder
// Sample rate is 48kHz and the amount of channels is 2
// The opus coding mode is optimized for audio
const encoder = new OpusEncoder(48000, 2, OpusApplication.OPUS_APPLICATION_AUDIO);
const decoder = new OpusDecoder(48000, 2);

const frameSize = 1920; // 40ms
const buffer = ...

// Encode and then decode
var encoded = encoder.encode(buffer, frameSize);
var decoded = decoder.decode(encoded, frameSize);
`

#### Record audio and play it back realtime

`javascript
const { RtAudio, RtAudioFormat } = require("audify");

// Init RtAudio instance using default sound API
const rtAudio = new RtAudio(/ Insert here specific API if needed /);

// Open the input/output stream
rtAudio.openStream(
{
deviceId: rtAudio.getDefaultOutputDevice(), // Output device id (Get all devices using getDevices)
nChannels: 1, // Number of channels
firstChannel: 0, // First channel index on device (default = 0).
},
{
deviceId: rtAudio.getDefaultInputDevice(), // Input device id (Get all devices using getDevices)
nChannels: 1, // Number of channels
firstChannel: 0, // First channel index on device (default = 0).
},
RtAudioFormat.RTAUDIO_SINT16, // PCM Format - Signed 16-bit integer
48000, // Sampling rate is 48kHz
1920, // Frame size is 1920 (40ms)
"MyStream", // The name of the stream (used for JACK Api)
(pcm) => rtAudio.write(pcm) // Input callback function, write every input pcm data to the output buffer
);

// Start the stream
rtAudio.start();
``

Documentation

Full documentation available here.

Legal

This project is licensed under the MIT license.