AudioTrack：sourceBuffer 属性
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
AudioTrack 接口的只读属性 sourceBuffer 返回创建该轨道的 SourceBuffer。如果轨道不是由 SourceBuffer 创建，或 SourceBuffer 已从其父媒体源的 MediaSource.sourceBuffers 属性中移除，则返回 null。
值
SourceBuffer 或 null。
规范
| Specification |
|---|
| Media Source Extensions™ # dom-audiotrack-sourcebuffer |
浏览器兼容性
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