音频输入流是具有指定音频格式和一个输入流

*长度。样本框，而不是字节长度表示。

*提供几种方法，用于读取目标的字节数，从

*流，或指定的字节数。

*音频输入流跟踪的最后一个字节被读取。

*您可以跳过任意的字节数到一个更高的位置

*阅读。的音频输入流可支持标记。当你设置一个标志，

*记住当前位置，让您可以稍后再返回。-An audio input stream is an input stream with a specified audio format and

* length.　The length is expressed in sample frames, not bytes.

* Several methods are provided for reading a certain number of bytes from

* the stream, or an unspecified number of bytes.

* The audio input stream keeps track　of the last byte that was read.

* You can skip over an arbitrary number of bytes to get to a later position

* for reading. An audio input stream may support marks.　When you set a mark,

* the current position is remembered so that you can return to it later.