使用计算机自带的报警小喇叭发生来播放音乐，音乐数据在data.txt中。具体说明见readme.txt-Using a computer built-in alarm to the occurrence of small speakers to play music, music data in data.txt. Details, see readme.txt

AsyncReadFilter 将由SDK自带的例子async修改而来，async是把文件先全部读取到内存然后播放。现在要把它修改成从文件直接读取数据。 -The AsyncReadFilter by SDK comes with examples of async modified from, the async file first of all read into memory and then play. It should now be modified to read data