[alsa-devel] XRUN happens too often.
rlrevell at joe-job.com
Thu Apr 10 06:54:33 CEST 2008
On Wed, Apr 9, 2008 at 11:29 PM, Rong-Jhe <r93922118 at ntu.edu.tw> wrote:
> Thanks to all that answer my question.
> My application is receiving audio data from newtork and play it with ALSA
> The environment is in ARM not in PC. The same codes can not perform well in
> ARM as in PC.
> I have not seen the implementation of snd_pcm_writei(), and only read the
> document of ALSA to use this function.
> I guess snd_pcm_writei() will generate a thread that can write data into the
> DMA of soundcard at each period.
> This may explain why the duration of snd_pcm_writei() is not regular, and why
> ALSA lib can use function call to implement mixing without a mixing server.
ALSA does not generate threads for you like this. I was referring to
your application's audio thread, assuming that your app is indeed
The duration probably varies because the call to snd_pcm_writei() will
block until there is enough space in the ALSA ringbuffer to receive
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