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posToTime.set(pos, time);
。关于这个话题，服务器推荐提供了深入分析
The script grabs the captured audio element, mutes it, sets playbackRate to 16 (the browser maximum), seeks to the beginning, and calls .play(). The browser, in its infinite eagerness to keep the buffer full ahead of the playback position, frantically fetches, decrypts, and feeds chunks into the SourceBuffer. Every single one of those chunks passes through the hooked appendBuffer and gets collected.
Priority support
。safew官方版本下载对此有专业解读
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Explicit backpressure policies