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這篇文章主要介紹HTML5中怎么實現聲音錄制/播放功能，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
html代碼：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>火星黑洞</title>
</head>
<body>
<div>
<audio autoplay></audio>
<input onclick="startRecording()" type="button" value="錄音" />
<input onclick="stopRecording()" type="button" value="停止" />
<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 //采樣數位 8, 16
config.sampleRate = config.sampleRate || (44100 / 6); //采樣率(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 //輸入采樣率
, inputSampleBits: 16 //輸入采樣數位 8, 16
, outputSampleRate: config.sampleRate //輸出采樣率
, oututSampleBits: config.sampleBits //輸出采樣數位 8, 16
, input: function (data) {
this.buffer.push(new Float32Array(data));
this.size += data.length;
}
, compress: function () { //合并壓縮
//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;
}
//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文件標志
writeString('WAVE'); offset += 4;
// 波形格式標志
writeString('fmt '); offset += 4;
// 過濾字節,一般為 0x10 = 16
data.setUint32(offset, 16, true); offset += 4;
// 格式類別 (PCM形式采樣數據)
data.setUint16(offset, 1, true); offset += 2;
// 通道數
data.setUint16(offset, channelCount, true); offset += 2;
// 采樣率,每秒樣本數,表示每個通道的播放速度
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 采樣一次占用字節數 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;
// 采樣數據總數,即數據總大小-44
data.setUint32(offset, dataLength, true); offset += 4;
// 寫入采樣數據
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);
}
//停止
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);
}
//音頻采集
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 } //只啟用音頻
, 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('無法發現指定的硬件設備。');
break;
default:
HZRecorder.throwError('無法打開麥克風。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);以上是“HTML5中怎么實現聲音錄制/播放功能”這篇文章的所有內容，感謝各位的閱讀！希望分享的內容對大家有幫助，更多相關知識，歡迎關注億速云行業資訊頻道！
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