wavesurfer.js

<!doctype html> <html lang="en"> <head> <title>Code coverage report for src/webaudio.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../prettify.css" /> <link rel="stylesheet" href="../base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="../index.html">all files</a> / <a href="index.html">src/</a> webaudio.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 3.49% Statements 6/172 </div> <div class='fl pad1y space-right2'> 0% Branches 0/86 </div> <div class='fl pad1y space-right2'> 0% Functions 0/44 </div> <div class='fl pad1y space-right2'> 3.55% Lines 6/169 </div> </div> </div> <div class='status-line low'></div> <pre><table class="coverage"> <tr><td class="line-count quiet">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428</td><td class="line-coverage quiet">    1×                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             1×   1×                         1×                         1×                         1×  </td><td class="text"><pre class="prettyprint lang-js">'use strict';   WaveSurfer.WebAudio = { scriptBufferSize: 256, PLAYING_STATE: 0, PAUSED_STATE: 1, FINISHED_STATE: 2,   supportsWebAudio: function () { return !!(window.AudioContext || window.webkitAudioContext); },   getAudioContext: function () { if (!WaveSurfer.WebAudio.audioContext) { WaveSurfer.WebAudio.audioContext = new ( window.AudioContext || window.webkitAudioContext ); } return WaveSurfer.WebAudio.audioContext; },   getOfflineAudioContext: function (sampleRate) { if (!WaveSurfer.WebAudio.offlineAudioContext) { WaveSurfer.WebAudio.offlineAudioContext = new ( window.OfflineAudioContext || window.webkitOfflineAudioContext )(1, 2, sampleRate); } return WaveSurfer.WebAudio.offlineAudioContext; },   init: function (params) { this.params = params; this.ac = params.audioContext || this.getAudioContext();   this.lastPlay = this.ac.currentTime; this.startPosition = 0; this.scheduledPause = null;   this.states = [ Object.create(WaveSurfer.WebAudio.state.playing), Object.create(WaveSurfer.WebAudio.state.paused), Object.create(WaveSurfer.WebAudio.state.finished) ];   this.createVolumeNode(); this.createScriptNode(); this.createAnalyserNode();   this.setState(this.PAUSED_STATE); this.setPlaybackRate(this.params.audioRate); },   disconnectFilters: function () { if (this.filters) { this.filters.forEach(function (filter) { filter && filter.disconnect(); }); this.filters = null; // Reconnect direct path this.analyser.connect(this.gainNode); } },   setState: function (state) { if (this.state !== this.states[state]) { this.state = this.states[state]; this.state.init.call(this); } },   // Unpacked filters setFilter: function () { this.setFilters([].slice.call(arguments)); },   /** * @param {Array} filters Packed ilters array */ setFilters: function (filters) { // Remove existing filters this.disconnectFilters();   // Insert filters if filter array not empty if (filters && filters.length) { this.filters = filters;   // Disconnect direct path before inserting filters this.analyser.disconnect();   // Connect each filter in turn filters.reduce(function (prev, curr) { prev.connect(curr); return curr; }, this.analyser).connect(this.gainNode); }   },   createScriptNode: function () { if (this.ac.createScriptProcessor) { this.scriptNode = this.ac.createScriptProcessor(this.scriptBufferSize); } else { this.scriptNode = this.ac.createJavaScriptNode(this.scriptBufferSize); }   this.scriptNode.connect(this.ac.destination); },   addOnAudioProcess: function () { var my = this;   this.scriptNode.onaudioprocess = function () { var time = my.getCurrentTime();   if (time >= my.getDuration()) { my.setState(my.FINISHED_STATE); my.fireEvent('pause'); } else if (time >= my.scheduledPause) { my.pause(); } else if (my.state === my.states[my.PLAYING_STATE]) { my.fireEvent('audioprocess', time); } }; },   removeOnAudioProcess: function () { this.scriptNode.onaudioprocess = null; },   createAnalyserNode: function () { this.analyser = this.ac.createAnalyser(); this.analyser.connect(this.gainNode); },   /** * Create the gain node needed to control the playback volume. */ createVolumeNode: function () { // Create gain node using the AudioContext if (this.ac.createGain) { this.gainNode = this.ac.createGain(); } else { this.gainNode = this.ac.createGainNode(); } // Add the gain node to the graph this.gainNode.connect(this.ac.destination); },   /** * Set the gain to a new value. * * @param {Number} newGain The new gain, a floating point value * between 0 and 1. 0 being no gain and 1 being maximum gain. */ setVolume: function (newGain) { this.gainNode.gain.value = newGain; },   /** * Get the current gain. * * @returns {Number} The current gain, a floating point value * between 0 and 1. 0 being no gain and 1 being maximum gain. */ getVolume: function () { return this.gainNode.gain.value; },   decodeArrayBuffer: function (arraybuffer, callback, errback) { if (!this.offlineAc) { this.offlineAc = this.getOfflineAudioContext(this.ac ? this.ac.sampleRate : 44100); } this.offlineAc.decodeAudioData(arraybuffer, (function (data) { callback(data); }).bind(this), errback); },   /** * Set pre-decoded peaks. */ setPeaks: function (peaks) { this.peaks = peaks; },   /** * Compute the max and min value of the waveform when broken into * <length> subranges. * @param {Number} How many subranges to break the waveform into. * @returns {Array} Array of 2*<length> peaks or array of arrays * of peaks consisting of (max, min) values for each subrange. */ getPeaks: function (length) { if (this.peaks) { return this.peaks; }   var sampleSize = this.buffer.length / length; var sampleStep = ~~(sampleSize / 10) || 1; var channels = this.buffer.numberOfChannels; var splitPeaks = []; var mergedPeaks = [];   for (var c = 0; c < channels; c++) { var peaks = splitPeaks[c] = []; var chan = this.buffer.getChannelData(c);   for (var i = 0; i < length; i++) { var start = ~~(i * sampleSize); var end = ~~(start + sampleSize); var min = 0; var max = 0;   for (var j = start; j < end; j += sampleStep) { var value = chan[j];   if (value > max) { max = value; }   if (value < min) { min = value; } }   peaks[2 * i] = max; peaks[2 * i + 1] = min;   if (c == 0 || max > mergedPeaks[2 * i]) { mergedPeaks[2 * i] = max; }   if (c == 0 || min < mergedPeaks[2 * i + 1]) { mergedPeaks[2 * i + 1] = min; } } }   return this.params.splitChannels ? splitPeaks : mergedPeaks; },   getPlayedPercents: function () { return this.state.getPlayedPercents.call(this); },   disconnectSource: function () { if (this.source) { this.source.disconnect(); } },   destroy: function () { if (!this.isPaused()) { this.pause(); } this.unAll(); this.buffer = null; this.disconnectFilters(); this.disconnectSource(); this.gainNode.disconnect(); this.scriptNode.disconnect(); this.analyser.disconnect(); },   load: function (buffer) { this.startPosition = 0; this.lastPlay = this.ac.currentTime; this.buffer = buffer; this.createSource(); },   createSource: function () { this.disconnectSource(); this.source = this.ac.createBufferSource();   //adjust for old browsers. this.source.start = this.source.start || this.source.noteGrainOn; this.source.stop = this.source.stop || this.source.noteOff;   this.source.playbackRate.value = this.playbackRate; this.source.buffer = this.buffer; this.source.connect(this.analyser); },   isPaused: function () { return this.state !== this.states[this.PLAYING_STATE]; },   getDuration: function () { if (!this.buffer) { return 0; } return this.buffer.duration; },   seekTo: function (start, end) { if (!this.buffer) { return; }   this.scheduledPause = null;   if (start == null) { start = this.getCurrentTime(); if (start >= this.getDuration()) { start = 0; } } if (end == null) { end = this.getDuration(); }   this.startPosition = start; this.lastPlay = this.ac.currentTime;   if (this.state === this.states[this.FINISHED_STATE]) { this.setState(this.PAUSED_STATE); }   return { start: start, end: end }; },   getPlayedTime: function () { return (this.ac.currentTime - this.lastPlay) * this.playbackRate; },   /** * Plays the loaded audio region. * * @param {Number} start Start offset in seconds, * relative to the beginning of a clip. * @param {Number} end When to stop * relative to the beginning of a clip. */ play: function (start, end) { if (!this.buffer) { return; }   // need to re-create source on each playback this.createSource();   var adjustedTime = this.seekTo(start, end);   start = adjustedTime.start; end = adjustedTime.end;   this.scheduledPause = end;   this.source.start(0, start, end - start);   this.setState(this.PLAYING_STATE);   this.fireEvent('play'); },   /** * Pauses the loaded audio. */ pause: function () { this.scheduledPause = null;   this.startPosition += this.getPlayedTime(); this.source && this.source.stop(0);   this.setState(this.PAUSED_STATE);   this.fireEvent('pause'); },   /** * Returns the current time in seconds relative to the audioclip's duration. */ getCurrentTime: function () { return this.state.getCurrentTime.call(this); },   /** * Set the audio source playback rate. */ setPlaybackRate: function (value) { value = value || 1; if (this.isPaused()) { this.playbackRate = value; } else { this.pause(); this.playbackRate = value; this.play(); } } };   WaveSurfer.WebAudio.state = {};   WaveSurfer.WebAudio.state.playing = { init: function () { this.addOnAudioProcess(); }, getPlayedPercents: function () { var duration = this.getDuration(); return (this.getCurrentTime() / duration) || 0; }, getCurrentTime: function () { return this.startPosition + this.getPlayedTime(); } };   WaveSurfer.WebAudio.state.paused = { init: function () { this.removeOnAudioProcess(); }, getPlayedPercents: function () { var duration = this.getDuration(); return (this.getCurrentTime() / duration) || 0; }, getCurrentTime: function () { return this.startPosition; } };   WaveSurfer.WebAudio.state.finished = { init: function () { this.removeOnAudioProcess(); this.fireEvent('finish'); }, getPlayedPercents: function () { return 1; }, getCurrentTime: function () { return this.getDuration(); } };   WaveSurfer.util.extend(WaveSurfer.WebAudio, WaveSurfer.Observer);  </pre></td></tr> </table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="http://istanbul-js.org/" target="_blank">istanbul</a> at Sat Oct 01 2016 11:49:33 GMT+0200 (CEST) </div> </div> <script src="../prettify.js"></script> <script> window.