Modifies style of scroll bar, and adds option of audio buffer length.

修改滚动条样式，增加音频缓冲选项。

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In particular, it's often the case that you need to keep track of a buffer length, or read a length of something.

特别是，当您需要跟踪缓冲区长度或读取某个内容的长度时，通常就是这种情况。

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A formula for calculating receiving buffer length was proposed, based on the analysis and research on network parameters, such as jitter, average speed and packet loss fraction.

在分析研究延时抖动、平均速率和丢包率等网络参数的基础上，给出客户端接收缓冲区长度估算公式。根据客户端反馈网络参数在服务器端实现流量控制。

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