webaudiofont-npm/npm/dist/channel.js

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

'use strict';
export class WebAudioFontChannel {
    audioContext;
    input;
    band32;
    band64;
    band128;
    band256;
    band512;
    band1k;
    band2k;
    band4k;
    band8k;
    band16k;
    output;
    constructor(audioContext) {
        this.audioContext = audioContext;
        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);
    }
    bandEqualizer(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;
    }
    ;
}