* [alsa-devel] about pop chime on pcm api
@ 2019-08-30 8:31 Yang, Xiaotao (X.)
2019-09-09 17:47 ` Takashi Iwai
0 siblings, 1 reply; 2+ messages in thread
From: Yang, Xiaotao (X.) @ 2019-08-30 8:31 UTC (permalink / raw)
To: mailing list
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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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [alsa-devel] about pop chime on pcm api
2019-08-30 8:31 [alsa-devel] about pop chime on pcm api Yang, Xiaotao (X.)
@ 2019-09-09 17:47 ` Takashi Iwai
0 siblings, 0 replies; 2+ messages in thread
From: Takashi Iwai @ 2019-09-09 17:47 UTC (permalink / raw)
To: Yang, Xiaotao (X.); +Cc: mailing list
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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> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>
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2019-09-09 17:47 ` Takashi Iwai
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