小猿圈web前端开发之HTML5声音录制/播放功能的实现代码

对于学习前端的小伙伴来说，很多其他技术不能实现的功能，web前端都可以完成，今天小猿圈web前端讲师就分享一个html5声音录制/播放功能的实现代码，希望对你帮助。

html代码：

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<div>

<br />

</div>

var recorder;

var audio = document.querySelector('audio');

function startRecording() {

HZRecorder.get(function(rec) {

recorder = rec;

recorder.start();

}, {

sampleBits: 16,

sampleRate: 16000

});

}

function stopRecording() {

recorder.stop();

var blob = recorder.getBlob();

var url = URL.createObjectURL(blob);

var div = document.createElement('div');

var au = document.createElement('audio');

var hf = document.createElement('a');

au.controls = true;

au.src = url;

hf.href = url;

hf.download = new Date().toISOString() + '.wav';

hf.innerHTML = hf.download;

div.appendChild(au);

div.appendChild(hf);

recordingslist.appendChild(div);

}

function playRecording() {

recorder.play(audio);

}

function uploadAudio() {

recorder.upload("Handler1.ashx", function(state, e) {

switch(state) {

case 'uploading':

//var percentComplete = Math.round(e.loaded * 100 / e.total) + '%';

break;

case 'ok':

//alert(e.target.responseText);

alert("上传成功");

break;

case 'error':

alert("上传失败");

break;

case 'cancel':

alert("上传被取消");

break;

}

});

}

</script>

</body>

</html>

HZRecorder.js

(function (window) {

//兼容

window.URL = window.URL || window.webkitURL;

navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;

var 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)

var context = new (window.webkitAudioContext || window.AudioContext)();

var audioInput = context.createMediaStreamSource(stream);

var createScript = context.createScriptProcessor || context.createJavaScriptNode;

var recorder = createScript.apply(context, [4096, 1, 1]);

var mp3ReceiveSuccess, currentErrorCallback;

var 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

var data = new Float32Array(this.size);

var offset = 0;

for (var i = 0; i < this.buffer.length; i++) {

data.set(this.buffer[i], offset);

offset += this.buffer[i].length;

}

//压缩

var compression = parseInt(this.inputSampleRate / this.outputSampleRate);

var length = data.length / compression;

var result = new Float32Array(length);

var index = 0, j = 0;

while (index < length) {

result[index] = data[j];

j += compression;

index++;

}

return result;

}

, encodeWAV: function () {

var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);

var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);

var bytes = this.compress();

var dataLength = bytes.length * (sampleBits / 8);

var buffer = new ArrayBuffer(44 + dataLength);

var data = new DataView(buffer);

var channelCount = 1;//单声道

var offset = 0;

var writeString = function (str) {

for (var 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 (var i = 0; i < bytes.length; i++, offset++) {

var s = Math.max(-1, Math.min(1, bytes[i]));

var val = s < 0 ? s * 0x8000 : s * 0x7FFF;

val = parseInt(255 / (65535 / (val + 32768)));

data.setInt8(offset, val, true);

}

} else {

for (var i = 0; i < bytes.length; i++, offset += 2) {

var 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/wav' });

}

};

//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) {

audio.src = window.URL.createObjectURL(this.getBlob());

}

//上传

this.upload = function (url, callback) {

var fd = new FormData();

fd.append("audioData", this.getBlob());

var xhr = new XMLHttpRequest();

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);

}

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) {

var 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;

}

window.HZRecorder = HZRecorder;

})(window);

以上就是关于HTML5声音录制/播放功能的实现代码的详细介绍，希望对同学们有所帮助。那还在等什么快去学习吧，如果你没有好的学习平台可以了解一下小猿圈的，它是你学习中的灯塔web前端自学②群：738735873，指路灯明灯，只要你坚持就会有成为工程师的可能，学习就是坚持，坚持改变自己的人生的过程。

转载于:https://juejin.im/post/5d034c45e51d4577523f2370

小猿圈web前端开发之HTML5声音录制/播放功能的实现代码

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