这次给大家带来h5如何操作声音录制/播放，h5操作声音录制/播放的注意事项有哪些，下面就是实战案例，一起来看一下。
html代码：
<!doctype html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>h5调用声音</title>
</head>
<body>
<p>
<audio autoplay></audio>
<input onclick="startrecording()" type="button" value="录音" />
<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 />
<p id="recordingslist"></p>
</p>
<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 p = document.createelement('p');
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;
p.appendchild(au);
p.appendchild(hf);
recordingslist.appendchild(p);
}
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);
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以上就是h5如何操作声音录制/播放的详细内容。