小猿圈web前端開發之HTML5聲音錄製/播放功能的實現代碼

時間  2019-12-05
標籤 web 前端 開發 html5 html 聲音 錄製 播放 功能 實現 代碼 欄目 HTML 简体版
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對於學習前端的小夥伴來講，不少其餘技術不能實現的功能，web前端均可以完成，今天小猿圈web前端講師就分享一個html5聲音錄製/播放功能的實現代碼，但願對你幫助。javascript


html代碼：html

<!DOCTYPE html>前端

<html>html5

<head>java

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />web

<title>小猿圈</title>瀏覽器

</head>緩存

<body>app

<div>學習

<audio autoplay></audio>

<input onclick="startRecording()" type="button" value="錄音" />

<input onclick="stopRecording()" type="button" value="中止" />

<input onclick="playRecording()" type="button" value="播放" />

<input onclick="uploadAudio()" type="button" value="提交" />

<br />

<div id="recordingslist"></div>

</div>

<script type="text/javascript" src="js/HZRecorder.js"></script>

<script>

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("上傳成功");

break;

case 'error':

alert("上傳失敗");

break;

case 'cancel':

alert("上傳被取消");

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 //採樣數位 8, 16

config.sampleRate = config.sampleRate || (44100 / 6); //採樣率(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 //錄音文件長度

, buffer: [] //錄音緩存

, inputSampleRate: context.sampleRate //輸入採樣率

, inputSampleBits: 16 //輸入採樣數位 8, 16

, outputSampleRate: config.sampleRate //輸出採樣率

, oututSampleBits: config.sampleBits //輸出採樣數位 8, 16

, input: function (data) {

this.buffer.push(new Float32Array(data));

this.size += data.length;

}

, compress: function () { //合併壓縮

//合併

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;

}

//壓縮

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;//單聲道

var offset = 0;

var writeString = function (str) {

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

data.setUint8(offset + i, str.charCodeAt(i));

}

}

// 資源交換文件標識符

writeString('RIFF'); offset += 4;

// 下個地址開始到文件尾總字節數,即文件大小-8

data.setUint32(offset, 36 + dataLength, true); offset += 4;

// WAV文件標誌

writeString('WAVE'); offset += 4;

// 波形格式標誌

writeString('fmt '); offset += 4;

// 過濾字節,通常爲 0x10 = 16

data.setUint32(offset, 16, true); offset += 4;

// 格式類別 (PCM形式採樣數據)

data.setUint16(offset, 1, true); offset += 2;

// 通道數

data.setUint16(offset, channelCount, true); offset += 2;

// 採樣率,每秒樣本數,表示每一個通道的播放速度

data.setUint32(offset, sampleRate, true); offset += 4;

// 波形數據傳輸率 (每秒平均字節數) 單聲道×每秒數據位數×每樣本數據位/8

data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;

// 快數據調整數 採樣一次佔用字節數 單聲道×每樣本的數據位數/8

data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;

// 每樣本數據位數

data.setUint16(offset, sampleBits, true); offset += 2;

// 數據標識符

writeString('data'); offset += 4;

// 採樣數據總數,即數據總大小-44

data.setUint32(offset, dataLength, true); offset += 4;

// 寫入採樣數據

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' });

}

};

//開始錄音

this.start = function () {

audioInput.connect(recorder);

recorder.connect(context.destination);

}

//中止

this.stop = function () {

recorder.disconnect();

}

//獲取音頻文件

this.getBlob = function () {

this.stop();

return audioData.encodeWAV();

}

//回放

this.play = function (audio) {

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

}

//上傳

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);

}

//音頻採集

recorder.onaudioprocess = function (e) {

audioData.input(e.inputBuffer.getChannelData(0));

//record(e.inputBuffer.getChannelData(0));

}

};

//拋出異常

HZRecorder.throwError = function (message) {

alert(message);

throw new function () { this.toString = function () { return message; } }

}

//是否支持錄音

HZRecorder.canRecording = (navigator.getUserMedia != null);

//獲取錄音機

HZRecorder.get = function (callback, config) {

if (callback) {

if (navigator.getUserMedia) {

navigator.getUserMedia(

{ audio: true } //只啓用音頻

, function (stream) {

var rec = new HZRecorder(stream, config);

callback(rec);

}

, function (error) {

switch (error.code || error.name) {

case 'PERMISSION_DENIED':

case 'PermissionDeniedError':

HZRecorder.throwError('用戶拒絕提供信息。');

break;

case 'NOT_SUPPORTED_ERROR':

case 'NotSupportedError':

HZRecorder.throwError('瀏覽器不支持硬件設備。');

break;

case 'MANDATORY_UNSATISFIED_ERROR':

case 'MandatoryUnsatisfiedError':

HZRecorder.throwError('沒法發現指定的硬件設備。');

break;

default:

HZRecorder.throwError('沒法打開麥克風。異常信息:' + (error.code || error.name));

break;

}

});

} else {

HZRecorder.throwErr('當前瀏覽器不支持錄音功能。'); return;

}

}

}

window.HZRecorder = HZRecorder;

})(window);

以上就是關於HTML5聲音錄製/播放功能的實現代碼的詳細介紹，但願對同窗們有所幫助。那還在等什麼快去學習吧，若是你沒有好的學習平臺能夠了解一下小猿圈的，它是你學習中的燈塔web前端自學②羣：738735873，指路燈明燈，只要你堅持就會有成爲工程師的可能，學習就是堅持，堅持改變本身的人生的過程。

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