On Wed, Apr 9, 2008 at 11:29 PM, Rong-Jhe <r93922118@xxxxxxxxxx> wrote: > Thanks to all that answer my question. > My application is receiving audio data from newtork and play it with ALSA > library. > 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 multithreaded. The duration probably varies because the call to snd_pcm_writei() will block until there is enough space in the ALSA ringbuffer to receive your data. Lee _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
