MediaTrackSettings.sampleSize

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MediaTrackSettings dictionary's sampleSize property is an integer indicating the linear sample size (in bits per sample) the MediaStreamTrack is currently configured for. This lets you determine what value was selected to comply with your specified constraints for this property's value as described in the MediaTrackConstraints.sampleSize property you provided when calling either getUserMedia() or MediaStreamTrack.applyConstraints() .

If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.sampleSize as returned by a call to MediaDevices.getSupportedConstraints() . However, typically this is unnecessary since browsers will simply ignore any constraints they're unfamiliar with.

句法

var sampleSize = MediaTrackSettings.sampleSize;

值

An integer value indicating how many bits each audio sample is represented by. The most commonly used sample size for many years now is 16 bits per sample, which was used for CD audio among others. Other common sample sizes are 8 (for reduced bandwidth requirements) and 24 (for high-resolution professional audio).

Each audio channel on the track requires sampleSize bits. That means that a given sample actually uses ( sampleSize /8)* channelCount bytes of data. For example, 16-bit stereo audio requires (16/8)*2 or 4 bytes per sample.

范例

见 Example: Constraint exerciser in Capabilities, constraints, and settings 范例。

规范

规范	状态	注释
媒体捕获和流 The definition of 'sampleSize' in that specification.	候选推荐	最初的规范。

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`sampleSize`	Chrome Yes	Edge ≤79	Firefox No	IE ?	Opera Yes	Safari ?	WebView Android Yes	Chrome Android Yes	Firefox Android No	Opera Android Yes	Safari iOS ?	Samsung Internet Android Yes

图例

完整支持
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元数据

最后修改： 2020 年 1 月 22 日

Media Streams API
MediaTrackSettings
特性
1. aspectRatio
2. autoGainControl
3. channelCount
4. cursor
5. deviceId
6. displaySurface
7. echoCancellation
8. facingMode
9. frameRate
10. groupId
11. height
12. latency
13. noiseSuppression
14. sampleRate
15. sampleSize
16. volume
17. width
Related pages for Media Capture and Streams

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句法

值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题