src/yuu/audio.js

   1 /* Copyright 2014 Yukkuri Games
   2    Licensed under the terms of the GNU GPL v2 or later
   3    @license https://www.gnu.org/licenses/gpl-2.0.html
   4    @source: https://yukkurigames.com/yuu/
   5 */
   6
   7 (function (yuu) {
   8     "use strict";
   9
  10     var yT = this.yT || require("./yT");
  11     var yf = this.yf || require("./yf");
  12
  13     yuu.Audio = yT({
  14         /** Audio context/source/buffer accessor
  15
  16             You probably don't need to make this yourself; one is made
  17             named yuu.audio during initialization.
  18
  19             You can set the master volume with yuu.audio.masterVolume.
  20         */
  21         constructor: function () {
  22             this._ctx = new window.AudioContext();
  23             this._compressor = this._ctx.createDynamicsCompressor();
  24             this._masterVolume = this._ctx.createGain();
  25             this._masterVolume.connect(this._compressor);
  26             this._compressor.connect(this._ctx.destination);
  27             this._musicVolume = this._ctx.createGain();
  28             this._musicVolume.connect(this._masterVolume);
  29             this._masterVolume.gain.value = 0.5;
  30             this._musicVolume.gain.value = 0.5;
  31
  32             this._bufferCache = {};
  33             this._mute = false;
  34             this._storage = null;
  35             this._volume = this._masterVolume.gain.value;
  36         },
  37
  38         destination: { alias: "_masterVolume", readonly: true },
  39         music: { alias: "_musicVolume", readonly: true },
  40
  41         _readStorage: function () {
  42             if (!this._storage)
  43                 return;
  44             yf.each.call(this, function (prop) {
  45                 this[prop] = this._storage.getObject(prop, this[prop]);
  46             }, ["volume", "musicVolume", "mute"]);
  47         },
  48
  49         _writeStorage: yf.debounce(function () {
  50             if (!this._storage)
  51                 return;
  52             yf.each.call(this, function (prop) {
  53                 this._storage.setObject(prop, this[prop]);
  54             }, ["volume", "musicVolume", "mute"]);
  55         }),
  56
  57         storage: {
  58             get: function () { return this._storage; },
  59             set: function (v) {
  60                 this._storage = v;
  61                 this._readStorage();
  62             }
  63         },
  64
  65         mute: {
  66             get: function () { return this._mute; },
  67             set: function (v) {
  68                 this._mute = !!v;
  69                 this.volume = this.volume;
  70             }
  71         },
  72
  73         volume: {
  74             get: function () { return this._volume; },
  75             set: function (v) {
  76                 this._volume = v;
  77                 v = this._mute ? 0 : v;
  78                 this._masterVolume.gain.value = v;
  79                 this._writeStorage();
  80             }
  81         },
  82
  83         musicVolume: {
  84             get: function () { return this._musicVolume.gain.value; },
  85             set: function (v) {
  86                 this._musicVolume.gain.value = v;
  87                 this._writeStorage();
  88             }
  89         },
  90
  91         currentTime: { alias: "_ctx.currentTime" },
  92
  93         decodeAudioData: function (data) {
  94             var ctx = this._ctx;
  95             try {
  96                 return ctx.decodeAudioData(data);
  97             } catch (exc) {
  98                 return new Promise(function (resolve, reject) {
  99                     ctx.decodeAudioData(data, function (buffer) {
 100                         resolve(buffer);
 101                     }, function () {
 102                         reject(new Error("Error decoding audio buffer"));
 103                     });
 104                 });
 105             }
 106         },
 107
 108         createBufferSource: function (path) {
 109             var source = this._ctx.createBufferSource();
 110             var sample = new yuu.AudioSample(path, this);
 111             if ((source.buffer = sample.buffer) === null) {
 112                 sample.ready.then(function () {
 113                     source.buffer = sample.buffer;
 114                 });
 115             }
 116             return source;
 117         },
 118
 119         sampleRate: { alias: "_ctx.sampleRate" },
 120         createGain: { proxy: "_ctx.createGain" },
 121         createOscillator: { proxy: "_ctx.createOscillator" },
 122     });
 123
 124     // FIXME: This parsing is garbagey, would be better to parse when
 125     // first handed a dfn and turn everything into a function.
 126     function applyMod (s, v) {
 127         if (yf.isFunction(s))
 128             return s(v);
 129         else if (s === +s)
 130             return s;
 131         else if (s[0] === "-" || s[0] === "+")
 132             return v + (+s);
 133         else if (s[0] === "x" || s[0] === "*")
 134             return v * +s.substring(1);
 135         else if (s[s.length - 1] === "%")
 136             return v * (parseFloat(s) / 100);
 137         else
 138             return +s;
 139     }
 140
 141     var Envelope = yuu.Envelope = yT({
 142         constructor: yf.argcd(
 143             function (pairs) {
 144                 Envelope.call(this, pairs, 1);
 145             },
 146             function (pairs, scale) {
 147                 pairs = pairs || { "0": 1, "100%": 1 };
 148                 this.ts = Object.keys(pairs);
 149                 this.vs = yf.map.call(pairs, yf.getter, this.ts);
 150                 this.scale = scale;
 151                 var a = 0, b = 0;
 152                 var unlimited = false;
 153                 yf.each(function (t) {
 154                     if (+t) {
 155                         a = Math.max(+t, a);
 156                         b = Math.min(+t, b);
 157                     }
 158                     unlimited = unlimited || (t[t.length - 1] === "%");
 159                 }, this.ts);
 160                 this.minDuration = a - b;
 161                 this.maxDuration = (unlimited || a === b)
 162                     ? Infinity
 163                     : this.minDuration;
 164                 var vMin = Math.min.apply(Math, this.vs);
 165                 var vMax = Math.max.apply(Math, this.vs);
 166                 this.constant = vMin === vMax && this.vs[0] * this.scale;
 167             }
 168         ),
 169
 170         schedule: function (param, t0, scale, duration) {
 171             if (this.constant !== false) {
 172                 param.setValueAtTime(scale * this.constant, t0);
 173             } else {
 174                 yf.each.call(this, function (s, v) {
 175                     v = v * scale * this.scale;
 176                     var t = t0 + applyMod(s, duration);
 177                     if (t === t0)
 178                         param.setValueAtTime(v, t);
 179                     else
 180                         param.linearRampToValueAtTime(v, t);
 181                 }, this.ts, this.vs);
 182             }
 183         }
 184     });
 185
 186     yuu.AudioSample = yuu.Caching(yT({
 187         constructor: function (path, ctx) {
 188             ctx = ctx || yuu.audio;
 189             var url = yuu.resourcePath(path, "sound", "wav");
 190             this.data = null;
 191             this.ready = yuu.GET(url, { responseType: "arraybuffer" })
 192                 .then(ctx.decodeAudioData.bind(ctx))
 193                 .then(yf.setter.bind(this, "buffer"))
 194                 .then(yf.K(this));
 195         }
 196     }), function (args) { return args.length <= 2 ? args[0] : null; });
 197
 198     yuu.Modulator = yT({
 199         constructor: function (dfn) {
 200             this.envelope = new yuu.Envelope(dfn.envelope);
 201             this.frequency = dfn.frequency;
 202             this.index = dfn.index || 1.0;
 203         },
 204
 205         createModulator: function (ctx, t0, fundamental, duration) {
 206             var modulator = ctx.createOscillator();
 207             modulator.frequency.value = applyMod(
 208                 this.frequency, fundamental);
 209             modulator.start(t0);
 210             modulator.stop(t0 + duration);
 211             var modulatorG = ctx.createGain();
 212             modulator.connect(modulatorG);
 213             this.envelope.schedule(
 214                 modulatorG.gain, t0, this.index * fundamental, duration);
 215             return modulatorG;
 216         }
 217     });
 218
 219     yuu.Instrument = yT({
 220         constructor: function (dfn) {
 221             if (yf.isString(dfn)) {
 222                 var sampleName = dfn;
 223                 dfn = { sample: {} };
 224                 dfn.sample[sampleName] = {};
 225             }
 226             this.envelope = new yuu.Envelope(dfn.envelope);
 227             this.frequency = dfn.frequency || (dfn.sample ? {} : { "x1": 1.0 });
 228             this.modulator = yf.map(
 229                 yf.new_(yuu.Modulator), yf.arrayify(dfn.modulator || []));
 230             this.sample = dfn.sample || {};
 231             this.ready = yuu.ready(
 232                 yf.map(yf.new_(yuu.AudioSample), Object.keys(this.sample)),
 233                 this);
 234         },
 235
 236         createSound: function (ctx, t0, fundamental, amplitude, duration) {
 237             // TODO: In the case of exactly one sample with a constant
 238             // envelope, optimize out the extra gain node.
 239             duration = yf.clamp(duration || 0,
 240                                 this.envelope.minDuration,
 241                                 this.envelope.maxDuration);
 242             var ret = ctx.createGain();
 243             var dst = ret;
 244
 245             yf.ipairs(function (name, params) {
 246                 var buffer = new yuu.AudioSample(name).buffer;
 247                 if (buffer && !params.loop)
 248                     duration = Math.max(buffer.duration, duration);
 249             }, this.sample);
 250
 251             var modulators = yf.map(function (modulator) {
 252                 return modulator.createModulator(
 253                     ctx, t0, fundamental, duration);
 254             }, this.modulator);
 255
 256             yf.ipairs.call(this, function (name, params) {
 257                 var src = ctx.createBufferSource(name);
 258                 src.loop = params.loop || false;
 259                 src.playbackRate.value = applyMod(
 260                     params.playbackRate || 1, fundamental || ctx.sampleRate);
 261                 yf.each(function (mod) { mod.connect(src.playbackRate); },
 262                         modulators);
 263                 if (params.duration)
 264                     src.start(t0, params.offset || 0, params.duration);
 265                 else
 266                     src.start(t0, params.offset || 0);
 267                 src.stop(t0 + duration);
 268                 src.connect(dst);
 269             }, this.sample);
 270
 271             yf.ipairs.call(this, function (mfreq, mamp) {
 272                 var osc = ctx.createOscillator();
 273                 osc.frequency.value = applyMod(mfreq, fundamental);
 274                 osc.start(t0);
 275                 osc.stop(t0 + duration);
 276                 yf.each(function (mod) { mod.connect(osc.frequency); },
 277                         modulators);
 278                 if (mamp !== 1) {
 279                     var gain = ctx.createGain();
 280                     gain.gain.value = mamp;
 281                     osc.connect(gain);
 282                     gain.connect(dst);
 283                 } else {
 284                     osc.connect(dst);
 285                 }
 286             }, this.frequency);
 287
 288             ret.gain.value = 0;
 289             this.envelope.schedule(ret.gain, t0, amplitude, duration);
 290             return ret;
 291         },
 292
 293         play: yf.argcd(
 294             function () {
 295                 return this.play(null, 0, 0, 1, 1);
 296             },
 297             function (ctx, t, freq, amp, duration) {
 298                 ctx = ctx || yuu.audio;
 299                 t = t || ctx.currentTime;
 300                 var g = this.createSound(ctx, t, freq, amp, duration);
 301                 g.connect(ctx.destination);
 302                 return g;
 303             }
 304         )
 305     });
 306
 307     yuu.Instruments = yf.mapValues(yf.new_(yuu.Instrument), {
 308         SINE: {
 309             envelope: { "0": 0, "0.016": 1, "-0.016": 1, "100%": 0 },
 310         },
 311
 312         ORGAN: {
 313             envelope: { "0": 0, "0.016": 1, "-0.016": 1, "100%": 0 },
 314             frequency: { "x1": 0.83, "x1.5": 0.17 }
 315         },
 316
 317         SIREN: {
 318             envelope: { "0": 1 },
 319             modulator: {
 320                 envelope: { "0": 1 },
 321                 frequency: "1",
 322                 index: 0.2
 323             }
 324         },
 325
 326         BELL: {
 327             envelope: { "0": 1, "2.5": 0.2, "5": 0 },
 328             modulator: {
 329                 envelope: { "0": 1, "2.5": 0.2, "5": 0 },
 330                 frequency: "x1.5",
 331             }
 332         },
 333
 334         BRASS: {
 335             envelope: { "0": 0, "0.2": 1, "0.4": 0.6, "-0.1": 0.5, "100%": 0 },
 336             modulator: {
 337                 envelope: { "0": 0, "0.2": 1, "0.4": 0.6,
 338                             "-0.1": 0.5, "100%": 0 },
 339                 frequency: "x1",
 340                 index: 5.0
 341             }
 342         },
 343     });
 344
 345     // Tune to A440 by default, although every interface should provide
 346     // some ways to work around this. This gives C4 = ~261.63 Hz.
 347     // https://en.wikipedia.org/wiki/Scientific_pitch_notation
 348     yuu.C4_HZ = 440 * Math.pow(2, -9/12);
 349
 350     yuu.Scale = yT({
 351         constructor: function (intervals) {
 352             this.intervals = intervals;
 353             this.length = this.intervals.length;
 354             this.span = yf.foldl(function (a, b) { return a + b; }, intervals);
 355         },
 356
 357         hz: function (tonic, degree, accidental) {
 358             accidental = accidental || 0;
 359             var s = this.span * ((degree / this.intervals.length) | 0)
 360                 + accidental;
 361             degree %= this.intervals.length;
 362             if (degree < 0) {
 363                 degree += this.intervals.length;
 364                 s -= this.span;
 365             }
 366             var i = 0;
 367             while (degree >= 1) {
 368                 degree -= 1;
 369                 s += this.intervals[i];
 370                 i++;
 371             }
 372             if (degree > 0)
 373                 s += this.intervals[i] * degree;
 374             return tonic * Math.pow(2, s / 1200.0);
 375         }
 376     });
 377
 378     yuu.Scales = yf.mapValues(yf.new_(yuu.Scale), {
 379         CHROMATIC: yf.repeat(100, 12),
 380         MINOR: [200, 100, 200, 200, 100, 200, 200],
 381         MAJOR: [200, 200, 100, 200, 200, 200, 100],
 382         WHOLE_TONE: [200, 200, 200, 200, 200, 200],
 383         AUGMENTED: [300, 100, 300, 100, 300, 100],
 384         _17ET: yf.repeat(1200 / 17, 17),
 385         DOUBLE_HARMONIC: [100, 300, 100, 200, 100, 300, 100],
 386     });
 387
 388     var DURATION = { T: 1/8, S: 1/4, I: 1/2, Q: 1, H: 2, W: 4,
 389                      ".": 1.5, "/": 1/3, "<": -1 };
 390     var ACCIDENTAL = { b: -1, "#": 1, t: 0.5, d: -0.5 };
 391
 392     var NOTE = /([TSIQHW][<.\/]*)?(?:([XZ]|(?:[A-G][b#dt]*[0-9]+))|([+-]?[0-9.]+)([b#dt]*))|([-+<>{]|(?:[TSIQHW][.\/]?))/g;
 393
 394     var LETTERS = { Z: null, X: null };
 395
 396     yuu.parseNote = function (note, scale, C4) {
 397         return (C4 || yuu.C4_HZ) * Math.pow(2, LETTERS[note] / 12);
 398     };
 399
 400     yuu.parseScore = function (score, scale, tonic, C4) {
 401         // Note language:
 402         //
 403         // To play a scientific pitch note and advance the time, just
 404         // use its name: G4, Cb2, A#0
 405         //
 406         // To adjust the length of the note, use T, S, I, Q (default),
 407         // H, W for 32nd through whole. Append . to do
 408         // time-and-a-half. Append / to cut into a third. Append < to
 409         // go back in time.
 410         //
 411         // To play a note on the provided scale, use a 0-based number
 412         // (which can be negative). To move the current scale up or
 413         // down, use + or -. For example, in C major, 0 and C4 produce
 414         // the same note; after a -, 0 and C3 produce the same note.
 415         //
 416         // To rest, use Z or X.
 417         //
 418         // To play multiple notes at the same time, enclose them all with
 419         // < ... >. The time will advance in accordance with the shortest
 420         // one.
 421         //
 422         // To reset the time, scale offset, and duration, use a {.
 423         // This can be more convenient when writing pieces with
 424         // multiple parts than grouping, e.g.
 425         //     H < 1 8 > < 2 7 > < 3 6 > < 4 5 >
 426         // is easier to understand when split into multiple lines:
 427         //       H 1 2 3 4
 428         //     { H 8 7 6 5
 429
 430         scale = scale || yuu.Scales.MAJOR;
 431         C4 = C4 || yuu.C4_HZ;
 432         tonic = tonic || scale.tonic || C4;
 433         if (yf.isString(tonic))
 434             tonic = yuu.parseNote(tonic, C4);
 435
 436         var t = 0;
 437         var notes = [];
 438         var degree = 0;
 439         var groupLength = 0;
 440         var defaultDuration = "Q";
 441         var match;
 442
 443         function calcDuration (d, m) { return d * DURATION[m]; }
 444         function calcAccidental (d, m) { return d * ACCIDENTAL[m]; }
 445
 446         while ((match = NOTE.exec(score))) {
 447             switch (match[5]) {
 448             case "<":
 449                 groupLength = Infinity;
 450                 break;
 451             case ">":
 452                 t += groupLength === Infinity ? 0 : groupLength;
 453                 groupLength = 0;
 454                 break;
 455             case "+":
 456                 degree += scale.length;
 457                 break;
 458             case "-":
 459                 degree -= scale.length;
 460                 break;
 461             case "{":
 462                 t = 0;
 463                 degree = 0;
 464                 groupLength = 0;
 465                 defaultDuration = "Q";
 466                 break;
 467             default:
 468                 if (match[5]) {
 469                     defaultDuration = match[5];
 470                     continue;
 471                 }
 472                 var letter = match[2];
 473                 var duration = yf.foldl(
 474                     calcDuration, match[1] || defaultDuration, 1);
 475                 if (LETTERS[letter] !== null) {
 476                     var offset = match[3];
 477                     var accidental = yf.foldl(
 478                         calcAccidental, match[4] || "", 0) * 100;
 479                     notes.push({
 480                         time: t,
 481                         duration: duration,
 482                         hz: letter
 483                             ? C4 * Math.pow(2, LETTERS[letter]/12.0)
 484                             : scale.hz(tonic, degree + (+offset || 0), accidental)
 485                     });
 486                 }
 487                 if (groupLength && duration > 0)
 488                     groupLength = Math.min(groupLength, duration);
 489                 else
 490                     t += duration;
 491             }
 492         }
 493
 494         notes.sort(function (a, b) { return a.time - b.time; });
 495         return notes;
 496     };
 497
 498     yf.irange.call(LETTERS, function (i) {
 499         yf.ipairs.call(this, function (l, o) {
 500             var b = o + 12 * (i - 4);
 501             this[l + i] = b;
 502             yf.ipairs.call(this, function (s, m) {
 503                 this[l + s + i] = b + m;
 504             }, ACCIDENTAL);
 505         }, { C: 0, D: 2, E: 4, F: 5, G: 7, A: 9, B: 11 });
 506     }, 11);
 507
 508     yuu.registerInitHook(function () {
 509         if (!window.AudioContext)
 510             throw new Error("Web Audio isn't supported.");
 511         yuu.audio = new yuu.Audio();
 512         yuu.defaultCommands.volume = yuu.propcmd(
 513             yuu.audio, "volume",
 514             "get/set the current master audio volume", "0...1");
 515         yuu.defaultCommands.musicVolume = yuu.propcmd(
 516             yuu.audio, "musicVolume",
 517             "get/set the current music volume", "0...1");
 518         yuu.defaultCommands.mute = yuu.propcmd(
 519             yuu.audio, "mute", "mute or unmute audio");
 520     });
 521
 522 }).call(typeof exports === "undefined" ? this : exports,
 523         typeof exports === "undefined"
 524         ? this.yuu : (module.exports = require('./core')));