webaudiofont/npm/src/channel.js

Soundfonts for web. About of 2000 musical instruments. GM MIDI compatible.

'use strict'
console.log('WebAudioFont Channel v1.06 GPL3');
function WebAudioFontChannel(audioContext) {
	this.audioContext = audioContext;
	this.bandEqualizer = function (from, frequency) {
		var filter = this.audioContext.createBiquadFilter();
		filter.frequency.setTargetAtTime(frequency,0,0.0001);
		filter.type = "peaking";
		filter.gain.setTargetAtTime(0,0,0.0001);
		filter.Q.setTargetAtTime(1.0,0,0.0001);
		from.connect(filter);
		return filter;
	};
	this.input = audioContext.createGain();
	this.band32 = this.bandEqualizer(this.input, 32);
	this.band64 = this.bandEqualizer(this.band32, 64);
	this.band128 = this.bandEqualizer(this.band64, 128);
	this.band256 = this.bandEqualizer(this.band128, 256);
	this.band512 = this.bandEqualizer(this.band256, 512);
	this.band1k = this.bandEqualizer(this.band512, 1024);
	this.band2k = this.bandEqualizer(this.band1k, 2048);
	this.band4k = this.bandEqualizer(this.band2k, 4096);
	this.band8k = this.bandEqualizer(this.band4k, 8192);
	this.band16k = this.bandEqualizer(this.band8k, 16384);
	this.output = audioContext.createGain();
	this.band16k.connect(this.output);
	return this;
}
if (typeof module === 'object' && module.exports) {
	module.exports = WebAudioFontChannel;
}
if (typeof window !== 'undefined') {
	window.WebAudioFontChannel = WebAudioFontChannel;
}