note-player-stream

Plays different notes with the Web Audio API based on a stream of input

This module expects to be used with web-midi-note-stream, but accepts any stream which outputs objects that look like the following:

{
    pressed: Boolean, // Whether the button has been pressed/released
    note: Number, // Integer between [0-127] which represents a midi note
    frequency: Number, // The frequency to play the oscillator at (note required for custom nodes)
}

Usage

Install:

npm install --save note-player-stream

Require:

var playerStream = require("note-player-stream");
var player = playerStream({type: "square"});

Example

This example will listen for input from a Launchpad and play sound when a button is pressed

var playerStream = require("note-player-stream");
var noteStream = require("web-midi-note-stream");
var webMidi = require("web-midi");
 
webMidi("Launchpad")
    .pipe(noteStream())
    .pipe(playerStream());

API

playerStream([options])

Returns an object stream which takes in objects representing device input, and plays sound using the Web Audio API.

Options

Property	Default	Explanation
gain	0.2	How loud the output should be
output	ctx.destination	What node to output to
node	make oscillator	Function that takes data and returns an AudioNode
update	no-op	Function that takes data and a node that can be used to update the node on new data
type	sine	Type of oscillator to create