blob: 1de2c66fb5f027b665d1f0f09393e44ca1c062eb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
---
title: AudioBuffer.sampleRate
slug: Web/API/AudioBuffer/sampleRate
tags:
- API
- AudioBuffer
- Web Audio API
- sampleRate
translation_of: Web/API/AudioBuffer/sampleRate
---
<p>{{ APIRef("Web Audio API") }}</p>
<div>
<p>{{ domxref("AudioBuffer") }} 接口的 <code style="">sampleRate</code><span style='background-color: transparent; color: #333333; display: inline !important; float: none; font-family: "Open Sans",arial,x-locale-body,sans-serif; font-size: 16px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; white-space: normal;'> </span>属性返回一个以浮点数表示的采样率。该采样率是存储在缓冲区的PCM数据每秒钟的采样。</p>
</div>
<h2 id="语法">语法</h2>
<pre class="brush: js;highlight[22]">var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
myArrayBuffer.sampleRate;</pre>
<h3 id="返回值">返回值</h3>
<p>一个浮点数，表示缓冲区数据的当前采样率。</p>
<h2 id="示例">示例</h2>
<pre class="brush: js;highlight[22]">// Stereo
var channels = 2;
// Create an empty two second stereo buffer at the
// sample rate of the AudioContext
var frameCount = audioCtx.sampleRate * 2.0;
var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
button.onclick = function() {
// Fill the buffer with white noise;
// just random values between -1.0 and 1.0
for (var channel = 0; channel < channels; channel++) {
// This gives us the actual ArrayBuffer that contains the data
var nowBuffering = myArrayBuffer.getChannelData(channel);
for (var i = 0; i < frameCount; i++) {
// Math.random() is in [0; 1.0]
// audio needs to be in [-1.0; 1.0]
nowBuffering[i] = Math.random() * 2 - 1;
}
}
console.log(myArrayBuffer.sampleRate);
}</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('Web Audio API', '#widl-AudioBuffer-sampleRate', 'sampleRate')}}</td>
<td>{{Spec2('Web Audio API')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div>
<p>{{Compat("api.AudioBuffer.sampleRate")}}</p>
</div>
<h2 id="相关链接">相关链接</h2>
<ul>
<li><a href="/en-US/docs/Web/API/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
</ul>
|
