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alsa播放8k音频时，音频最后1.6秒左右会丢失，通过snd_pcm_avail_update获取多少frame未被播放，直到返回0，会有回声，对于44.1k音频，0.4秒左右会丢失。可能是因为alsa在close后，直接把内存中的数据free掉了，导致数据丢失。直接madplay播放也是一样的效果。奇葩的是，Ubuntu上面用madplay播放，貌似也有这种情况，但是数据丢失要小很多
