录音功能一般来说在移动端比较常见，但是在pc端也要实现按住说话的功能呢？项目需求：按住说话，时长不超过60秒，生成语音文件并上传，我这里用的是recorder.js
1.项目中新建一个recorder.js文件，内容如下，也可在百度上直接搜一个
// 兼容 window.URL = window.URL || window.webkitURL navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia let HZRecorder = function (stream, config) { config = config || {} config.sampleBits = config.sampleBits || 8 // 采样数位 8, 16 config.sampleRate = config.sampleRate || (44100 / 6) // 采样率(1/6 44100) let context = new (window.webkitAudioContext || window.AudioContext)() let audioInput = context.createMediaStreamSource(stream) let createScript = context.createScriptProcessor || context.createJavaScriptNode let recorder = createScript.apply(context, [4096, 1, 1]) let audioData = { size: 0, // 录音文件长度 buffer: [], // 录音缓存 inputSampleRate: context.sampleRate, // 输入采样率 inputSampleBits: 16, // 输入采样数位 8, 16 outputSampleRate: config.sampleRate, // 输出采样率 oututSampleBits: config.sampleBits, // 输出采样数位 8, 16 input: function (data) { this.buffer.push(new Float32Array(data)) this.size += data.length }, compress: function () { // 合并压缩 // 合并 let data = new Float32Array(this.size) let offset = 0 for (let i = 0; i < this.buffer.length; i++) { data.set(this.buffer[i], offset) offset += this.buffer[i].length } // 压缩 let compression = parseInt(this.inputSampleRate / this.outputSampleRate) let length = data.length / compression let result = new Float32Array(length) let index = 0; let j = 0 while (index < length) { result[index] = data[j] j += compression index++ } return result }, encodeWAV: function () { let sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate) let sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits) let bytes = this.compress() let dataLength = bytes.length * (sampleBits / 8) let buffer = new ArrayBuffer(44 + dataLength) let data = new DataView(buffer) let channelCount = 1// 单声道 let offset = 0 let writeString = function (str) { for (let i = 0; i < str.length; i++) { data.setUint8(offset + i, str.charCodeAt(i)) } } // 资源交换文件标识符 writeString('RIFF'); offset += 4 // 下个地址开始到文件尾总字节数,即文件大小-8 data.setUint32(offset, 36 + dataLength, true); offset += 4 // WAV文件标志 writeString('WAVE'); offset += 4 // 波形格式标志 writeString('fmt '); offset += 4 // 过滤字节,一般为 0x10 = 16 data.setUint32(offset, 16, true); offset += 4 // 格式类别 (PCM形式采样数据) data.setUint16(offset, 1, true); offset += 2 // 通道数 data.setUint16(offset, channelCount, true); offset += 2 // 采样率,每秒样本数,表示每个通道的播放速度 data.setUint32(offset, sampleRate, true); offset += 4 // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8 data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4 // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8 data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2 // 每样本数据位数 data.setUint16(offset, sampleBits, true); offset += 2 // 数据标识符 writeString('data'); offset += 4 // 采样数据总数,即数据总大小-44 data.setUint32(offset, dataLength, true); offset += 4 // 写入采样数据 if (sampleBits === 8) { for (let i = 0; i < bytes.length; i++ , offset++) { let s = Math.max(-1, Math.min(1, bytes[i])) let val = s < 0 ? s * 0x8000 : s * 0x7FFF val = parseInt(255 / (65535 / (val + 32768))) data.setInt8(offset, val, true) } } else { for (let i = 0; i < bytes.length; i++ , offset += 2) { let s = Math.max(-1, Math.min(1, bytes[i])) data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true) } } return new Blob([data], { type: 'audio/mp3' }) } } // 开始录音 this.start = function () { audioInput.connect(recorder) recorder.connect(context.destination) } // 停止 this.stop = function () { recorder.disconnect() } // 获取音频文件 this.getBlob = function () { this.stop() return audioData.encodeWAV() } // 回放 this.play = function (audio) { let downRec = document.getElementById('downloadRec') downRec.href = window.URL.createObjectURL(this.getBlob()) downRec.download = new Date().toLocaleString() + '.mp3' audio.src = window.URL.createObjectURL(this.getBlob()) } // 上传 this.upload = function (url, callback) { let fd = new FormData() fd.append('audioData', this.getBlob()) let xhr = new XMLHttpRequest() /* eslint-disable */ if (callback) { xhr.upload.addEventListener('progress', function (e) { callback('uploading', e) }, false) xhr.addEventListener('load', function (e) { callback('ok', e) }, false) xhr.addEventListener('error', function (e) { callback('error', e) }, false) xhr.addEventListener('abort', function (e) { callback('cancel', e) }, false) } /* eslint-disable */ xhr.open('POST', url) xhr.send(fd) } // 音频采集 recorder.onaudioprocess = function (e) { audioData.input(e.inputBuffer.getChannelData(0)) // record(e.inputBuffer.getChannelData(0)); } } // 抛出异常 HZRecorder.throwError = function (message) { alert(message) throw new function () { this.toString = function () { return message } }() } // 是否支持录音 HZRecorder.canRecording = (navigator.getUserMedia != null) // 获取录音机 HZRecorder.get = function (callback, config) { if (callback) { if (navigator.getUserMedia) { navigator.getUserMedia( { audio: true } // 只启用音频 , function (stream) { let rec = new HZRecorder(stream, config) callback(rec) } , function (error) { switch (error.code || error.name) { case 'PERMISSION_DENIED': case 'PermissionDeniedError': HZRecorder.throwError('用户拒绝提供信息。') break case 'NOT_SUPPORTED_ERROR': case 'NotSupportedError': HZRecorder.throwError('浏览器不支持硬件设备。') break case 'MANDATORY_UNSATISFIED_ERROR': case 'MandatoryUnsatisfiedError': HZRecorder.throwError('无法发现指定的硬件设备。') break default: HZRecorder.throwError('无法打开麦克风。异常信息:' + (error.code || error.name)) break } }) } else { HZRecorder.throwErr('当前浏览器不支持录音功能。'); return } } } export default HZRecorder
2.页面中使用，具体如下