如何利用js实现录音上传功能

灰太狼 2020-06-07 15:39 923阅读 0赞

# 如何利用js实现录音上传功能

具体代码如下所示：

1、html页面

```html
<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title id="title"></title>
 
</head>
<body>
<audio id="player" autoplay controls></audio>
<p>
 <button onclick="start_reco()">开始录音</button>
</p>
<p>
 <button onclick="ai_reco()" style="background-color: cornflowerblue">发送语音指令</button>
</p>
</body>
<script type="application/javascript" src="/static/jquery-3.3.1.min.js"></script>
<script type="text/javascript" src="/static/Recorder.js"></script>
<script type="application/javascript">
 var reco = null;
 var audio_context = new AudioContext();//音频内容对象
 navigator.getUserMedia = (navigator.getUserMedia ||
  navigator.webkitGetUserMedia ||
  navigator.mozGetUserMedia ||
  navigator.msGetUserMedia); // 兼容其他浏览器
 
 navigator.getUserMedia({audio: true}, create_stream, function (err) {
  console.log(err)
 });
 
 function create_stream(user_media) {
  var stream_input = audio_context.createMediaStreamSource(user_media);
  reco = new Recorder(stream_input);
 }
 
 
 function start_reco() {
  reco.record();
 }
 
 function ai_reco() {
  reco.stop();
 
  reco.exportWAV(function (wav_file) {
   console.log(wav_file);
   var formdata = new FormData(); // form 表单 {key:value}
   formdata.append("audio", wav_file); // form input type="file"
   $.ajax({
    url: "/receive_audio",
    type: 'post',
    processData: false,
    contentType: false,
    data: formdata,
    dataType: 'json',
    success: function (data) {
     console.log(data);
     document.getElementById("player").src = "/get_audio/" + data.filename;
    }
   })
  });
  reco.clear();
 }
 
</script>
</html>
```

2、Recorder.js内容

```javascript
(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){
"use strict";
 
module.exports = require("./recorder").Recorder;
 
},{"./recorder":2}],2:[function(require,module,exports){
'use strict';
 
var _createClass = (function () {
 function defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
   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);
  }
 }return function (Constructor, protoProps, staticProps) {
  if (protoProps) defineProperties(Constructor.prototype, protoProps);if (staticProps) defineProperties(Constructor, staticProps);return Constructor;
 };
})();
 
Object.defineProperty(exports, "__esModule", {
 value: true
});
exports.Recorder = undefined;
 
var _inlineWorker = require('inline-worker');
 
var _inlineWorker2 = _interopRequireDefault(_inlineWorker);
 
function _interopRequireDefault(obj) {
 return obj && obj.__esModule ? obj : { default: obj };
}
 
function _classCallCheck(instance, Constructor) {
 if (!(instance instanceof Constructor)) {
  throw new TypeError("Cannot call a class as a function");
 }
}
 
var Recorder = exports.Recorder = (function () {
 function Recorder(source, cfg) {
  var _this = this;
 
  _classCallCheck(this, Recorder);
 
  this.config = {
   bufferLen: 4096,
   numChannels: 2,
   mimeType: 'audio_pcm/wav'
  };
  this.recording = false;
  this.callbacks = {
   getBuffer: [],
   exportWAV: []
  };
 
  Object.assign(this.config, cfg);
  this.context = source.context;
  this.node = (this.context.createScriptProcessor || this.context.createJavaScriptNode).call(this.context, this.config.bufferLen, this.config.numChannels, this.config.numChannels);
 
  this.node.onaudioprocess = function (e) {
   if (!_this.recording) return;
 
   var buffer = [];
   for (var channel = 0; channel < _this.config.numChannels; channel++) {
    buffer.push(e.inputBuffer.getChannelData(channel));
   }
   _this.worker.postMessage({
    command: 'record',
    buffer: buffer
   });
  };
 
  source.connect(this.node);
  this.node.connect(this.context.destination); //this should not be necessary
 
  var self = {};
  this.worker = new _inlineWorker2.default(function () {
   var recLength = 0,
    recBuffers = [],
    sampleRate = undefined,
    numChannels = undefined;
 
   self.onmessage = function (e) {
    switch (e.data.command) {
     case 'init':
      init(e.data.config);
      break;
     case 'record':
      record(e.data.buffer);
      break;
     case 'exportWAV':
      exportWAV(e.data.type);
      break;
     case 'getBuffer':
      getBuffer();
      break;
     case 'clear':
      clear();
      break;
    }
   };
 
   function init(config) {
    sampleRate = config.sampleRate;
    numChannels = config.numChannels;
    initBuffers();
   }
 
   function record(inputBuffer) {
    for (var channel = 0; channel < numChannels; channel++) {
     recBuffers[channel].push(inputBuffer[channel]);
    }
    recLength += inputBuffer[0].length;
   }
 
   function exportWAV(type) {
    var buffers = [];
    for (var channel = 0; channel < numChannels; channel++) {
     buffers.push(mergeBuffers(recBuffers[channel], recLength));
    }
    var interleaved = undefined;
    if (numChannels === 2) {
     interleaved = interleave(buffers[0], buffers[1]);
    } else {
     interleaved = buffers[0];
    }
    var dataview = encodeWAV(interleaved);
    var audioBlob = new Blob([dataview], { type: type });
 
    self.postMessage({ command: 'exportWAV', data: audioBlob });
   }
 
   function getBuffer() {
    var buffers = [];
    for (var channel = 0; channel < numChannels; channel++) {
     buffers.push(mergeBuffers(recBuffers[channel], recLength));
    }
    self.postMessage({ command: 'getBuffer', data: buffers });
   }
 
   function clear() {
    recLength = 0;
    recBuffers = [];
    initBuffers();
   }
 
   function initBuffers() {
    for (var channel = 0; channel < numChannels; channel++) {
     recBuffers[channel] = [];
    }
   }
 
   function mergeBuffers(recBuffers, recLength) {
    var result = new Float32Array(recLength);
    var offset = 0;
    for (var i = 0; i < recBuffers.length; i++) {
     result.set(recBuffers[i], offset);
     offset += recBuffers[i].length;
    }
    return result;
   }
 
   function interleave(inputL, inputR) {
    var length = inputL.length + inputR.length;
    var result = new Float32Array(length);
 
    var index = 0,
     inputIndex = 0;
 
    while (index < length) {
     result[index++] = inputL[inputIndex];
     result[index++] = inputR[inputIndex];
     inputIndex++;
    }
    return result;
   }
 
   function floatTo16BitPCM(output, offset, input) {
    for (var i = 0; i < input.length; i++, offset += 2) {
     var s = Math.max(-1, Math.min(1, input[i]));
     output.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
    }
   }
 
   function writeString(view, offset, string) {
    for (var i = 0; i < string.length; i++) {
     view.setUint8(offset + i, string.charCodeAt(i));
    }
   }
 
   function encodeWAV(samples) {
    var buffer = new ArrayBuffer(44 + samples.length * 2);
    var view = new DataView(buffer);
 
    /* RIFF identifier */
    writeString(view, 0, 'RIFF');
    /* RIFF chunk length */
    view.setUint32(4, 36 + samples.length * 2, true);
    /* RIFF type */
    writeString(view, 8, 'WAVE');
    /* format chunk identifier */
    writeString(view, 12, 'fmt ');
    /* format chunk length */
    view.setUint32(16, 16, true);
    /* sample format (raw) */
    view.setUint16(20, 1, true);
    /* channel count */
    view.setUint16(22, numChannels, true);
    /* sample rate */
    view.setUint32(24, sampleRate, true);
    /* byte rate (sample rate * block align) */
    view.setUint32(28, sampleRate * 4, true);
    /* block align (channel count * bytes per sample) */
    view.setUint16(32, numChannels * 2, true);
    /* bits per sample */
    view.setUint16(34, 16, true);
    /* data chunk identifier */
    writeString(view, 36, 'data');
    /* data chunk length */
    view.setUint32(40, samples.length * 2, true);
 
    floatTo16BitPCM(view, 44, samples);
 
    return view;
   }
  }, self);
 
  this.worker.postMessage({
   command: 'init',
   config: {
    sampleRate: this.context.sampleRate,
    numChannels: this.config.numChannels
   }
  });
 
  this.worker.onmessage = function (e) {
   var cb = _this.callbacks[e.data.command].pop();
   if (typeof cb == 'function') {
    cb(e.data.data);
   }
  };
 }
 
 _createClass(Recorder, [{
  key: 'record',
  value: function record() {
   this.recording = true;
  }
 }, {
  key: 'stop',
  value: function stop() {
   this.recording = false;
  }
 }, {
  key: 'clear',
  value: function clear() {
   this.worker.postMessage({ command: 'clear' });
  }
 }, {
  key: 'getBuffer',
  value: function getBuffer(cb) {
   cb = cb || this.config.callback;
   if (!cb) throw new Error('Callback not set');
 
   this.callbacks.getBuffer.push(cb);
 
   this.worker.postMessage({ command: 'getBuffer' });
  }
 }, {
  key: 'exportWAV',
  value: function exportWAV(cb, mimeType) {
   mimeType = mimeType || this.config.mimeType;
   cb = cb || this.config.callback;
   if (!cb) throw new Error('Callback not set');
 
   this.callbacks.exportWAV.push(cb);
 
   this.worker.postMessage({
    command: 'exportWAV',
    type: mimeType
   });
  }
 }], [{
  key: 'forceDownload',
  value: function forceDownload(blob, filename) {
   var url = (window.URL || window.webkitURL).createObjectURL(blob);
   var link = window.document.createElement('a');
   link.href = url;
   link.download = filename || 'output.wav';
   var click = document.createEvent("Event");
   click.initEvent("click", true, true);
   link.dispatchEvent(click);
  }
 }]);
 
 return Recorder;
})();
 
exports.default = Recorder;
 
},{"inline-worker":3}],3:[function(require,module,exports){
"use strict";
 
module.exports = require("./inline-worker");
},{"./inline-worker":4}],4:[function(require,module,exports){
(function (global){
"use strict";
 
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; }; })();
 
var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
 
var WORKER_ENABLED = !!(global === global.window && global.URL && global.Blob && global.Worker);
 
var InlineWorker = (function () {
 function InlineWorker(func, self) {
 var _this = this;
 
 _classCallCheck(this, InlineWorker);
 
 if (WORKER_ENABLED) {
  var functionBody = func.toString().trim().match(/^function\s*\w*\s*$[\w\s,]*$\s*{([\w\W]*?)}$/)[1];
  var url = global.URL.createObjectURL(new global.Blob([functionBody], { type: "text/javascript" }));
 
  return new global.Worker(url);
 }
 
 this.self = self;
 this.self.postMessage = function (data) {
  setTimeout(function () {
  _this.onmessage({ data: data });
  }, 0);
 };
 
 setTimeout(function () {
  func.call(self);
 }, 0);
 }
 
 _createClass(InlineWorker, {
 postMessage: {
  value: function postMessage(data) {
  var _this = this;
 
  setTimeout(function () {
   _this.self.onmessage({ data: data });
  }, 0);
  }
 }
 });
 
 return InlineWorker;
})();
 
module.exports = InlineWorker;
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}]},{},[1])(1)
});
```

3、flask写法

```javascript
...
@app.route("/")
def index():
 return render_template("index.html")
 
@app.route("/receive_audio", methods=["POST"])
def receive_audio():
 file = request.files.get("audio")
 if file:
  filepath = os.path.join(BAISE_DIR, "data", "%s.m4a" % uuid4())
  file.save(filepath)
 
  text = baidu.auido2text(filepath)
 
  answer = tuling.chat(text)
 
  res = baidu.text2audio(answer)
  if res.get("err_no") == 200:
   return {"code": 200, "filename": res.get("filename")}
 
 return {"code": 201, "msg": "上传失败"}
 
 
@app.route("/get_audio/<filename>")
def get_audio(filename):
 return send_file(os.path.join(BAISE_DIR, "data", filename))
 
...
```

**注意：flask启动ip写成127.0.0.1，其他地址js可能会报错。**