mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-06-25 00:32:27 +00:00
506 lines
18 KiB
JavaScript
506 lines
18 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.TssChannelAdapter = exports.SampledAudio = exports.SampleAudio = exports.WorkerSoundChannel = exports.POKEYDeviceChannel = exports.newPOKEYAudio = exports.SN76489_Audio = exports.AY38910_Audio = exports.MasterAudio = void 0;
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class MasterAudio {
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constructor() {
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this.master = new MasterChannel();
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}
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start() {
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if (!this.looper) {
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this.looper = new AudioLooper(512);
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this.looper.setChannel(this.master);
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this.looper.activate();
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}
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}
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stop() {
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if (this.looper) {
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this.looper.setChannel(null);
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this.looper = null;
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}
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}
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}
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exports.MasterAudio = MasterAudio;
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class AY38910_Audio {
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constructor(master) {
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this.psg = new PsgDeviceChannel();
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this.curreg = 0;
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this.master = master;
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this.psg.setMode(PsgDeviceChannel.MODE_SIGNED);
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this.psg.setDevice(PsgDeviceChannel.DEVICE_AY_3_8910);
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master.master.addChannel(this.psg);
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}
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reset() {
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for (var i = 15; i >= 0; i--) {
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this.selectRegister(i);
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this.setData(0);
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}
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}
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selectRegister(val) {
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this.curreg = val & 0xf;
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}
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setData(val) {
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this.psg.writeRegisterAY(this.curreg, val & 0xff);
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}
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readData() {
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return this.psg.readRegister(this.curreg);
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}
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currentRegister() { return this.curreg; }
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}
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exports.AY38910_Audio = AY38910_Audio;
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class SN76489_Audio {
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constructor(master) {
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this.psg = new PsgDeviceChannel();
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this.master = master;
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this.psg.setMode(PsgDeviceChannel.MODE_SIGNED);
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this.psg.setDevice(PsgDeviceChannel.DEVICE_SN76489);
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master.master.addChannel(this.psg);
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}
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reset() {
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// TODO
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}
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setData(val) {
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this.psg.writeRegisterSN(0, val & 0xff);
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}
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}
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exports.SN76489_Audio = SN76489_Audio;
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// https://en.wikipedia.org/wiki/POKEY
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// https://user.xmission.com/~trevin/atari/pokey_regs.html
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// http://krap.pl/mirrorz/atari/homepage.ntlworld.com/kryten_droid/Atari/800XL/atari_hw/pokey.htm
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function newPOKEYAudio(count) {
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var audio = new MasterAudio();
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for (var i = 1; i <= count; i++) {
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var pokey = new exports.POKEYDeviceChannel();
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audio['pokey' + i] = pokey; // TODO: cheezy
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audio.master.addChannel(pokey);
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}
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return audio;
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}
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exports.newPOKEYAudio = newPOKEYAudio;
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function combinePolys(a, b) {
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var arr = new Uint8Array(a.length * b.length);
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var n = 0;
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for (var i = 0; i < arr.length; i++) {
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arr[i] = b[n % b.length];
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if (a[i % a.length])
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n++;
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}
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return arr;
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}
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function divideBy(n) {
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var arr = new Uint8Array(n * 2);
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arr.fill(1, 0, n);
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return arr;
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}
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var POKEYDeviceChannel = function () {
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/* definitions for AUDCx (D201, D203, D205, D207) */
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var NOTPOLY5 = 0x80; /* selects POLY5 or direct CLOCK */
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var POLY4 = 0x40; /* selects POLY4 or POLY17 */
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var PURE = 0x20; /* selects POLY4/17 or PURE tone */
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var VOL_ONLY = 0x10; /* selects VOLUME OUTPUT ONLY */
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var VOLUME_MASK = 0x0f; /* volume mask */
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/* definitions for AUDCTL (D208) */
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var POLY9 = 0x80; /* selects POLY9 or POLY17 */
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var CH1_179 = 0x40; /* selects 1.78979 MHz for Ch 1 */
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var CH3_179 = 0x20; /* selects 1.78979 MHz for Ch 3 */
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var CH1_CH2 = 0x10; /* clocks channel 1 w/channel 2 */
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var CH3_CH4 = 0x08; /* clocks channel 3 w/channel 4 */
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var CH1_FILTER = 0x04; /* selects channel 1 high pass filter */
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var CH2_FILTER = 0x02; /* selects channel 2 high pass filter */
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var CLOCK_15 = 0x01; /* selects 15.6999kHz or 63.9210kHz */
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/* for accuracy, the 64kHz and 15kHz clocks are exact divisions of
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the 1.79MHz clock */
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var DIV_64 = 28; /* divisor for 1.79MHz clock to 64 kHz */
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var DIV_15 = 114; /* divisor for 1.79MHz clock to 15 kHz */
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/* the size (in entries) of the 4 polynomial tables */
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var POLY4_SIZE = 0x000f;
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var POLY5_SIZE = 0x001f;
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var POLY9_SIZE = 0x01ff;
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var POLY17_SIZE = 0x0001ffff; /* else use the full 17 bits */
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/* channel/chip definitions */
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var CHAN1 = 0;
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var CHAN2 = 1;
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var CHAN3 = 2;
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var CHAN4 = 3;
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var CHIP1 = 0;
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var CHIP2 = 4;
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var CHIP3 = 8;
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var CHIP4 = 12;
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var SAMPLE = 127;
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var FREQ_17_EXACT = 1789790.0; /* exact 1.79 MHz clock freq */
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var FREQ_17_APPROX = 1787520.0; /* approximate 1.79 MHz clock freq */
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// LFSR sequences
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var bit1 = new Uint8Array([1]);
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var bit2 = new Uint8Array([0, 1]); // TODO?
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var bit4 = new Uint8Array([1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0]);
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var bit5 = new Uint8Array([0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1]);
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var bit9 = new Uint8Array([0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0]);
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var bit15 = new Uint8Array([1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
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var bit31 = new Uint8Array([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
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var bit17 = new Uint8Array(1 << 14);
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for (var i = 0; i < bit17.length; i++) {
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bit17[i] = Math.random() > 0.5 ? 1 : 0;
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}
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var bit17_5 = combinePolys(bit17, bit5);
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var bit5_4 = combinePolys(bit5, bit4);
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var wavetones = [
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bit17_5, bit5, bit5_4, bit5,
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bit17, bit2, bit4, bit2
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];
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// TIA
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var div2 = divideBy(2);
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var div6 = divideBy(6);
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var div31 = divideBy(31);
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var div93 = divideBy(93);
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var bit15_4 = combinePolys(bit15, bit4);
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var bit5_2 = combinePolys(bit5, div2);
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var bit5_6 = combinePolys(bit5, div6);
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var tiawavetones = [
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bit1, bit4, bit15_4, bit5_4,
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div2, div2, div31, bit5_2,
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bit9, bit5, div31, bit1,
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div6, div6, div93, bit5_6
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];
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// registers
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var regs = new Uint8Array(16);
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var counters = new Float32Array(4);
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var deltas = new Float32Array(4);
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var volume = new Float32Array(4);
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var audc = new Uint8Array(4);
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var waveforms = [bit1, bit1, bit1, bit1];
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var buffer;
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var sampleRate;
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var clock, baseDelta;
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var dirty = true;
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//
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this.setBufferLength = function (length) {
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buffer = new Int32Array(length);
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};
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this.getBuffer = function () {
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return buffer;
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};
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this.setSampleRate = function (rate) {
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sampleRate = rate;
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baseDelta = FREQ_17_EXACT / rate;
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};
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function updateValues(addr) {
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var ctrl = regs[8];
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var base = (ctrl & CLOCK_15) ? DIV_15 : DIV_64;
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var div;
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var i = addr & 4;
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var j = i >> 1;
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var k = i >> 2;
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if (ctrl & (CH1_CH2 >> k)) {
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if (ctrl & (CH1_179 >> k))
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div = regs[i + 2] * 256 + regs[i + 0] + 7;
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else
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div = (regs[i + 2] * 256 + regs[i + 0] + 1) * base;
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deltas[j + 1] = baseDelta / div;
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deltas[j + 0] = 0;
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}
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else {
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if (ctrl & (CH1_179 >> k)) {
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div = regs[i + 0] + 4;
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}
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else {
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div = (regs[i + 0] + 1) * base;
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}
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deltas[j + 0] = baseDelta / div;
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div = (regs[i + 2] + 1) * base;
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deltas[j + 1] = baseDelta / div;
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}
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//console.log(addr, ctrl.toString(16), div, deltas[j+0], deltas[j+1]);
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}
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this.setRegister = function (addr, value) {
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addr &= 0xf;
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value &= 0xff;
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if (regs[addr] != value) {
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regs[addr] = value;
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switch (addr) {
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case 0:
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case 2:
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case 4:
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case 6: // AUDF
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case 8: // ctrl
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dirty = true;
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break;
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case 1:
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case 3:
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case 5:
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case 7: // AUDC
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volume[addr >> 1] = value & 0xf;
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waveforms[addr >> 1] = wavetones[value >> 5];
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break;
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}
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}
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};
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this.getRegister = function (addr) {
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addr &= 0xf;
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return regs[addr];
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};
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this.setTIARegister = function (addr, value) {
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switch (addr) {
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case 0x17:
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case 0x18:
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regs[(addr & 1) * 4] = value & 0x1f;
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dirty = true;
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break;
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case 0x15:
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case 0x16:
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waveforms[(addr & 1) * 2] = tiawavetones[value & 0xf];
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break;
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case 0x19:
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case 0x1a:
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volume[(addr & 1) * 2] = value & 0xf;
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break;
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}
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};
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this.generate = function (length) {
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if (dirty) {
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updateValues(0);
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updateValues(4);
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dirty = false;
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}
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for (var s = 0; s < length; s += 2) {
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var sample = 0;
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for (var i = 0; i < 4; i++) {
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var d = deltas[i];
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var v = volume[i];
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if (d > 0 && d < 1 && v > 0) {
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var wav = waveforms[i];
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var cnt = counters[i] += d;
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if (cnt > wav.length) {
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cnt = counters[i] = cnt - Math.floor(cnt / wav.length) * wav.length;
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}
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var on = wav[Math.floor(cnt)];
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if (on) {
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sample += v;
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}
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}
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}
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sample *= 64;
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buffer[s] = sample;
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buffer[s + 1] = sample;
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}
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};
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};
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exports.POKEYDeviceChannel = POKEYDeviceChannel;
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////// Worker sound
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var WorkerSoundChannel = function (worker) {
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var sampleRate;
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var output;
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var pending = [];
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var pendingLength = 0;
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worker.onmessage = function (e) {
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if (e && e.data && e.data.samples && output) {
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pending.push(e.data.samples);
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pendingLength += e.data.samples.length;
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}
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};
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this.setBufferLength = function (length) {
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output = new Int16Array(length);
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//worker.postMessage({bufferLength:length,numChannels:2});
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pendingLength = 0;
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};
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this.getBuffer = function () {
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return output;
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};
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this.setSampleRate = function (rate) {
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sampleRate = rate;
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worker.postMessage({ sampleRate: rate });
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};
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this.generate = function (length) {
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if (pendingLength < length * 3) {
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//console.log(length, pendingLength);
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output.fill(0);
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return; // TODO: send sync msg?
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}
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for (var i = 0; i < output.length;) {
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if (pending.length == 0)
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break; // TODO?
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var buf = pending.shift();
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pendingLength -= buf.length;
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var l = output.length - i;
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if (buf.length < l) {
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output.set(buf, i);
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}
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else {
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output.set(buf.slice(0, l), i);
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pending.unshift(buf.slice(l));
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pendingLength += buf.length - l;
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}
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i += buf.length;
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}
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};
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};
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exports.WorkerSoundChannel = WorkerSoundChannel;
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// SampleAudio
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var SampleAudio = function (clockfreq) {
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var self = this;
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var sfrac, sinc, accum;
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var buffer, bufpos, bufferlist;
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var idrain, ifill;
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var nbuffers = 4;
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function mix(ape) {
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var buflen = ape.outputBuffer.length;
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var lbuf = ape.outputBuffer.getChannelData(0);
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var m = this.module;
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if (!m)
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m = ape.srcElement.module;
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if (!m)
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return;
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if (m.callback) {
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m.callback(lbuf);
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return;
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}
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else {
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var buf = bufferlist[idrain];
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for (var i = 0; i < lbuf.length; i++) {
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lbuf[i] = buf[i];
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//lbuf[i] = (i&128) ? 1.0 : 0.33;
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}
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idrain = (idrain + 1) % bufferlist.length;
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}
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}
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function clearBuffers() {
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if (bufferlist)
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for (var buf of bufferlist)
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buf.fill(0);
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}
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function createContext() {
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var AudioContext = window['AudioContext'] || window['webkitAudioContext'] || window['mozAudioContext'];
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if (!AudioContext) {
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console.log("no web audio context");
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return;
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}
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var ctx = new AudioContext();
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self.context = ctx;
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self.sr = self.context.sampleRate;
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self.bufferlen = 2048;
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// remove DC bias
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self.filterNode = self.context.createBiquadFilter();
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self.filterNode.type = 'lowshelf';
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self.filterNode.frequency.value = 100;
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self.filterNode.gain.value = -6;
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// mixer
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if (typeof self.context.createScriptProcessor === 'function') {
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self.mixerNode = self.context.createScriptProcessor(self.bufferlen, 1, 1);
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}
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else {
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self.mixerNode = self.context.createJavaScriptNode(self.bufferlen, 1, 1);
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}
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self.mixerNode.module = self;
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self.mixerNode.onaudioprocess = mix;
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// compressor for a bit of volume boost, helps with multich tunes
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self.compressorNode = self.context.createDynamicsCompressor();
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// patch up some cables :)
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self.mixerNode.connect(self.filterNode);
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self.filterNode.connect(self.compressorNode);
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self.compressorNode.connect(self.context.destination);
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}
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this.start = function () {
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if (this.context) {
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// Chrome autoplay (https://goo.gl/7K7WLu)
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if (this.context.state == 'suspended') {
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this.context.resume();
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}
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return; // already created
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}
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createContext(); // create it
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if (!this.context)
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return; // not created?
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sinc = this.sr * 1.0 / clockfreq;
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sfrac = 0;
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accum = 0;
|
|
bufpos = 0;
|
|
bufferlist = [];
|
|
idrain = 1;
|
|
ifill = 0;
|
|
for (var i = 0; i < nbuffers; i++) {
|
|
var arrbuf = new ArrayBuffer(self.bufferlen * 4);
|
|
bufferlist[i] = new Float32Array(arrbuf);
|
|
}
|
|
buffer = bufferlist[0];
|
|
};
|
|
this.stop = function () {
|
|
this.context && this.context.suspend && this.context.suspend();
|
|
clearBuffers(); // just in case it doesn't stop immediately
|
|
};
|
|
this.close = function () {
|
|
if (this.context) {
|
|
this.context.close();
|
|
this.context = null;
|
|
}
|
|
};
|
|
this.addSingleSample = function (value) {
|
|
if (!buffer)
|
|
return;
|
|
buffer[bufpos++] = value;
|
|
if (bufpos >= buffer.length) {
|
|
bufpos = 0;
|
|
bufferlist[ifill] = buffer;
|
|
var inext = (ifill + 1) % bufferlist.length;
|
|
if (inext == idrain) {
|
|
ifill = Math.floor(idrain + nbuffers / 2) % bufferlist.length;
|
|
//console.log('SampleAudio: skipped buffer', idrain, ifill); // TODO
|
|
}
|
|
else {
|
|
ifill = inext;
|
|
}
|
|
buffer = bufferlist[ifill];
|
|
}
|
|
};
|
|
this.feedSample = function (value, count) {
|
|
accum += value * count;
|
|
sfrac += sinc * count;
|
|
if (sfrac >= 1) {
|
|
accum /= sfrac;
|
|
while (sfrac >= 1) {
|
|
this.addSingleSample(accum * sinc);
|
|
sfrac -= 1;
|
|
}
|
|
accum *= sfrac;
|
|
}
|
|
};
|
|
};
|
|
exports.SampleAudio = SampleAudio;
|
|
class SampledAudio {
|
|
constructor(sampleRate) {
|
|
this.sa = new exports.SampleAudio(sampleRate);
|
|
}
|
|
feedSample(value, count) {
|
|
this.sa.feedSample(value, count);
|
|
}
|
|
start() {
|
|
this.sa.start();
|
|
}
|
|
stop() {
|
|
this.sa.stop();
|
|
}
|
|
}
|
|
exports.SampledAudio = SampledAudio;
|
|
class TssChannelAdapter {
|
|
constructor(chans, oversample, sampleRate) {
|
|
this.audioGain = 1.0 / 8192;
|
|
this.bufferLength = oversample * 2;
|
|
this.channels = chans.generate ? [chans] : chans; // array or single channel
|
|
this.channels.forEach((c) => {
|
|
c.setBufferLength(this.bufferLength);
|
|
c.setSampleRate(sampleRate);
|
|
});
|
|
}
|
|
generate(sink) {
|
|
var l = this.bufferLength;
|
|
var bufs = this.channels.map((ch) => ch.getBuffer());
|
|
this.channels.forEach((ch) => {
|
|
ch.generate(l);
|
|
});
|
|
for (let i = 0; i < l; i += 2) {
|
|
var total = 0;
|
|
bufs.forEach((buf) => total += buf[i]);
|
|
sink.feedSample(total * this.audioGain, 1);
|
|
}
|
|
;
|
|
}
|
|
}
|
|
exports.TssChannelAdapter = TssChannelAdapter;
|
|
//# sourceMappingURL=audio.js.map
|