AudioBuffer
接口的 sampleRate
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。
语法
var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate); myArrayBuffer.sampleRate;
返回值
一个浮点数,表示缓冲区数据的当前采样率。
示例
// 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); }
规范
Specification | Status | Comment |
---|---|---|
Web Audio API sampleRate |
Working Draft |
浏览器兼容性
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
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Desktop | Mobile | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic support | Chrome Full support 14 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support 15 | Safari Full support 6 | WebView Android Full support Yes | Chrome Android Full support 18 | Edge Mobile Full support Yes | Firefox Android Full support 26 | Opera Android Full support 15 | Safari iOS ? | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown