[alsa-devel] about pop chime on pcm api

[Takashi Iwai]

On Fri, 30 Aug 2019 10:31:25 +0200,
Yang, Xiaotao (X.) wrote:
> 
> 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();

It's not clear what "pop chime" means, so a bit hard to answer.

If the pop chime means some clicking noise, it shouldn't be a problem
in the second case, either.  It's more likely some issues in the
application side.


Takashi

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