about pop chime on pcm api

["Yang, Xiaotao (X.)" <xyang25@xxxxxxxxxxx>]

Hi:
               Why should I call api<snd_pcm_close()> between the interval if  I want to play a wav file two times repeatly, Otherwise pop chime occurs?

Eg: (fake code as follows):
         Following codes works good.
         Pcm.open();//open pcm device
         Pcm.play(demo.wav);//set parameter and call snd_pcm_writei() to play
         Pcm.close();//close pcm device
         Pcm.open();
         Pcm.play(demo.wav);
         Pcm.close();

        But following codes works with pop chime
        Pcm.open();
        Pcm.play(demo.wav);
        Pcm.play(demo.wav);
        Pcm.close();
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