1 <!DOCTYPE html>
2
3 <html>
4 <head>
5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
6 <title>Live input record and playback</title>
7 <style type='text/css'>
8 ul { list-style: none; }
9 #recordingslist audio { display: block; margin-bottom: 10px; }
10 </style>
11 </head>
12 <body>
13
14 <h1>Recorder.js simple WAV export example</h1>
15
16 <p>Make sure you are using a recent version of Google Chrome.</p>
17 <p>Also before you enable microphone input either plug in headphones or turn the volume down if you want to avoid ear splitting feedback!</p>
18
19 <button onclick="startRecording(this);">开始录音</button>
20 <button onclick="stopRecording(this);" disabled>停止</button>
21
22 <h2>Recordings</h2>
23 <ul id="recordingslist"></ul>
24
25 <h2>Log</h2>
26 <pre id="log"></pre>
27
28 <script>
29 function __log(e, data) {
30 log.innerHTML += "\n" + e + " " + (data || '');
31 }
32
33 var audio_context;
34 var recorder;
35
36 function startUserMedia(stream) {
37 var input = audio_context.createMediaStreamSource(stream);
38 __log('Media stream created.');
39
40 // Uncomment if you want the audio to feedback directly
41 //input.connect(audio_context.destination);
42 //__log('Input connected to audio context destination.');
43
44 recorder = new Recorder(input);
45 __log('Recorder initialised.');
46 }
47
48 function startRecording(button) {
49 recorder && recorder.record();
50 button.disabled = true;
51 button.nextElementSibling.disabled = false;
52 __log('Recording...');
53 }
54
55 function stopRecording(button) {
56 recorder && recorder.stop();
57 button.disabled = true;
58 button.previousElementSibling.disabled = false;
59 __log('Stopped recording.');
60
61 // create WAV download link using audio data blob
62 createDownloadLink();
63
64 recorder.clear();
65 }
66
67 function createDownloadLink() {
68 recorder && recorder.exportWAV(function(blob) {
69 var url = URL.createObjectURL(blob);
70 var li = document.createElement('li');
71 var au = document.createElement('audio');
72 var hf = document.createElement('a');
73
74 au.controls = true;
75 au.src = url;
76 hf.href = url;
77 hf.download = new Date().toISOString() + '.wav';
78 hf.innerHTML = hf.download;
79 li.appendChild(au);
80 li.appendChild(hf);
81 recordingslist.appendChild(li);
82 });
83 }
84
85 window.onload = function init() {
86 try {
87 // webkit shim
88 window.AudioContext = window.AudioContext || window.webkitAudioContext;
89 navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia;
90 window.URL = window.URL || window.webkitURL;
91
92 audio_context = new AudioContext;
93 __log('Audio context set up.');
94 __log('navigator.getUserMedia ' + (navigator.getUserMedia ? 'available.' : 'not present!'));
95 } catch (e) {
96 alert('No web audio support in this browser!');
97 }
98
99 navigator.getUserMedia({audio: true}, startUserMedia, function(e) {
100 __log('No live audio input: ' + e);
101 });
102 };
103 </script>
104
105 <script src="./dist/recorder.js"></script>
106 </body>
107 </html>
这是HTML代码部份，
1 (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Recorder = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
2 "use strict";
3
4 module.exports = require("./recorder").Recorder;
5
6 },{"./recorder":2}],2:[function(require,module,exports){
7 'use strict';
8
9 var _createClass = (function () {
10 function defineProperties(target, props) {
11 for (var i = 0; i < props.length; i++) {
12 var descriptor = props[i];descriptor.enumerable = descriptor.enumerable || false;descriptor.configurable = true;if ("value" in descriptor) descriptor.writable = true;Object.defineProperty(target, descriptor.key, descriptor);
13 }
14 }return function (Constructor, protoProps, staticProps) {
15 if (protoProps) defineProperties(Constructor.prototype, protoProps);if (staticProps) defineProperties(Constructor, staticProps);return Constructor;
16 };
17 })();
18
19 Object.defineProperty(exports, "__esModule", {
20 value: true
21 });
22 exports.Recorder = undefined;
23
24 var _inlineWorker = require('inline-worker');
25
26 var _inlineWorker2 = _interopRequireDefault(_inlineWorker);
27
28 function _interopRequireDefault(obj) {
29 return obj && obj.__esModule ? obj : { default: obj };
30 }
31
32 function _classCallCheck(instance, Constructor) {
33 if (!(instance instanceof Constructor)) {
34 throw new TypeError("Cannot call a class as a function");
35 }
36 }
37
38 var Recorder = exports.Recorder = (function () {
39 function Recorder(source, cfg) {
40 var _this = this;
41
42 _classCallCheck(this, Recorder);
43
44 this.config = {
45 bufferLen: 4096,
46 numChannels: 2,
47 mimeType: 'audio/wav'
48 };
49 this.recording = false;
50 this.callbacks = {
51 getBuffer: [],
52 exportWAV: []
53 };
54
55 Object.assign(this.config, cfg);
56 this.context = source.context;
57 this.node = (this.context.createScriptProcessor || this.context.createJavaScriptNode).call(this.context, this.config.bufferLen, this.config.numChannels, this.config.numChannels);
58
59 this.node.onaudioprocess = function (e) {
60 if (!_this.recording) return;
61
62 var buffer = [];
63 for (var channel = 0; channel < _this.config.numChannels; channel++) {
64 buffer.push(e.inputBuffer.getChannelData(channel));
65 }
66 _this.worker.postMessage({
67 command: 'record',
68 buffer: buffer
69 });
70 };
71
72 source.connect(this.node);
73 this.node.connect(this.context.destination); //this should not be necessary
74
75 var self = {};
76 this.worker = new _inlineWorker2.default(function () {
77 var recLength = 0,
78 recBuffers = [],
79 sampleRate = undefined,
80 numChannels = undefined;
81
82 self.onmessage = function (e) {
83 switch (e.data.command) {
84 case 'init':
85 init(e.data.config);
86 break;
87 case 'record':
88 record(e.data.buffer);
89 break;
90 case 'exportWAV':
91 exportWAV(e.data.type);
92 break;
93 case 'getBuffer':
94 getBuffer();
95 break;
96 case 'clear':
97 clear();
98 break;
99 }
100 };
101
102 function init(config) {
103 sampleRate = config.sampleRate;
104 numChannels = config.numChannels;
105 initBuffers();
106 }
107
108 function record(inputBuffer) {
109 for (var channel = 0; channel < numChannels; channel++) {
110 recBuffers[channel].push(inputBuffer[channel]);
111 }
112 recLength += inputBuffer[0].length;
113 }
114
115 function exportWAV(type) {
116 var buffers = [];
117 for (var channel = 0; channel < numChannels; channel++) {
118 buffers.push(mergeBuffers(recBuffers[channel], recLength));
119 }
120 var interleaved = undefined;
121 if (numChannels === 2) {
122 interleaved = interleave(buffers[0], buffers[1]);
123 } else {
124 interleaved = buffers[0];
125 }
126 var dataview = encodeWAV(interleaved);
127 var audioBlob = new Blob([dataview], { type: type });
128
129 self.postMessage({ command: 'exportWAV', data: audioBlob });
130 }
131
132 function getBuffer() {
133 var buffers = [];
134 for (var channel = 0; channel < numChannels; channel++) {
135 buffers.push(mergeBuffers(recBuffers[channel], recLength));
136 }
137 self.postMessage({ command: 'getBuffer', data: buffers });
138 }
139
140 function clear() {
141 recLength = 0;
142 recBuffers = [];
143 initBuffers();
144 }
145
146 function initBuffers() {
147 for (var channel = 0; channel < numChannels; channel++) {
148 recBuffers[channel] = [];
149 }
150 }
151
152 function mergeBuffers(recBuffers, recLength) {
153 var result = new Float32Array(recLength);
154 var offset = 0;
155 for (var i = 0; i < recBuffers.length; i++) {
156 result.set(recBuffers[i], offset);
157 offset += recBuffers[i].length;
158 }
159 return result;
160 }
161
162 function interleave(inputL, inputR) {
163 var length = inputL.length + inputR.length;
164 var result = new Float32Array(length);
165
166 var index = 0,
167 inputIndex = 0;
168
169 while (index < length) {
170 result[index++] = inputL[inputIndex];
171 result[index++] = inputR[inputIndex];
172 inputIndex++;
173 }
174 return result;
175 }
176
177 function floatTo16BitPCM(output, offset, input) {
178 for (var i = 0; i < input.length; i++, offset += 2) {
179 var s = Math.max(-1, Math.min(1, input[i]));
180 output.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
181 }
182 }
183
184 function writeString(view, offset, string) {
185 for (var i = 0; i < string.length; i++) {
186 view.setUint8(offset + i, string.charCodeAt(i));
187 }
188 }
189
190 function encodeWAV(samples) {
191 var buffer = new ArrayBuffer(44 + samples.length * 2);
192 var view = new DataView(buffer);
193
194 /* RIFF identifier */
195 writeString(view, 0, 'RIFF');
196 /* RIFF chunk length */
197 view.setUint32(4, 36 + samples.length * 2, true);
198 /* RIFF type */
199 writeString(view, 8, 'WAVE');
200 /* format chunk identifier */
201 writeString(view, 12, 'fmt ');
202 /* format chunk length */
203 view.setUint32(16, 16, true);
204 /* sample format (raw) */
205 view.setUint16(20, 1, true);
206 /* channel count */
207 view.setUint16(22, numChannels, true);
208 /* sample rate */
209 view.setUint32(24, sampleRate, true);
210 /* byte rate (sample rate * block align) */
211 view.setUint32(28, sampleRate * 4, true);
212 /* block align (channel count * bytes per sample) */
213 view.setUint16(32, numChannels * 2, true);
214 /* bits per sample */
215 view.setUint16(34, 16, true);
216 /* data chunk identifier */
217 writeString(view, 36, 'data');
218 /* data chunk length */
219 view.setUint32(40, samples.length * 2, true);
220
221 floatTo16BitPCM(view, 44, samples);
222
223 return view;
224 }
225 }, self);
226
227 this.worker.postMessage({
228 command: 'init',
229 config: {
230 sampleRate: this.context.sampleRate,
231 numChannels: this.config.numChannels
232 }
233 });
234
235 this.worker.onmessage = function (e) {
236 var cb = _this.callbacks[e.data.command].pop();
237 if (typeof cb == 'function') {
238 cb(e.data.data);
239 }
240 };
241 }
242
243 _createClass(Recorder, [{
244 key: 'record',
245 value: function record() {
246 this.recording = true;
247 }
248 }, {
249 key: 'stop',
250 value: function stop() {
251 this.recording = false;
252 }
253 }, {
254 key: 'clear',
255 value: function clear() {
256 this.worker.postMessage({ command: 'clear' });
257 }
258 }, {
259 key: 'getBuffer',
260 value: function getBuffer(cb) {
261 cb = cb || this.config.callback;
262 if (!cb) throw new Error('Callback not set');
263
264 this.callbacks.getBuffer.push(cb);
265
266 this.worker.postMessage({ command: 'getBuffer' });
267 }
268 }, {
269 key: 'exportWAV',
270 value: function exportWAV(cb, mimeType) {
271 mimeType = mimeType || this.config.mimeType;
272 cb = cb || this.config.callback;
273 if (!cb) throw new Error('Callback not set');
274
275 this.callbacks.exportWAV.push(cb);
276
277 this.worker.postMessage({
278 command: 'exportWAV',
279 type: mimeType
280 });
281 }
282 }], [{
283 key: 'forceDownload',
284 value: function forceDownload(blob, filename) {
285 var url = (window.URL || window.webkitURL).createObjectURL(blob);
286 var link = window.document.createElement('a');
287 link.href = url;
288 link.download = filename || 'output.wav';
289 var click = document.createEvent("Event");
290 click.initEvent("click", true, true);
291 link.dispatchEvent(click);
292 }
293 }]);
294
295 return Recorder;
296 })();
297
298 exports.default = Recorder;
299
300 },{"inline-worker":3}],3:[function(require,module,exports){
301 "use strict";
302
303 module.exports = require("./inline-worker");
304 },{"./inline-worker":4}],4:[function(require,module,exports){
305 (function (global){
306 "use strict";
307
308 var _createClass = (function () { function defineProperties(target, props) { for (var key in props) { var prop = props[key]; prop.configurable = true; if (prop.value) prop.writable = true; } Object.defineProperties(target, props); } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();
309
310 var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
311
312 var WORKER_ENABLED = !!(global === global.window && global.URL && global.Blob && global.Worker);
313
314 var InlineWorker = (function () {
315 function InlineWorker(func, self) {
316 var _this = this;
317
318 _classCallCheck(this, InlineWorker);
319
320 if (WORKER_ENABLED) {
321 var functionBody = func.toString().trim().match(/^function\s*\w*\s*\([\w\s,]*\)\s*{([\w\W]*?)}$/)[1];
322 var url = global.URL.createObjectURL(new global.Blob([functionBody], { type: "text/javascript" }));
323
324 return new global.Worker(url);
325 }
326
327 this.self = self;
328 this.self.postMessage = function (data) {
329 setTimeout(function () {
330 _this.onmessage({ data: data });
331 }, 0);
332 };
333
334 setTimeout(function () {
335 func.call(self);
336 }, 0);
337 }
338
339 _createClass(InlineWorker, {
340 postMessage: {
341 value: function postMessage(data) {
342 var _this = this;
343
344 setTimeout(function () {
345 _this.self.onmessage({ data: data });
346 }, 0);
347 }
348 }
349 });
350
351 return InlineWorker;
352 })();
353
354 module.exports = InlineWorker;
355 }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
356 },{}]},{},[1])(1)
357 });
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