At Mon, 14 Apr 2008 07:47:02 +0000 (UTC), Rong-Jhe wrote: > > > What you're trying to do? The server process will timeout (ends) > > itself when dmix clients are inactive. > > > > Jaroslav > > > > Thanks for your response. > My application uses two ways to play audio. > One is using pcm interface in ALSA library, and another is using dsp file. > My goal is to change the ways to play audio dynamically. > The pcm in ALSA library also uses the audio device. > There is only process can open the audio device at a time, so the audio device > must be closed before changing the way. > For example, if I open dsp file first and use write() to play audio, I need to > close the dsp file and then open pcm to use snd_pcm_writei(). > Similarly, if I open pcm first and use snd_pcm_writei(), I need to close the > pcm and then open the dsp file immediately. > Sometimes, when I change the way from using pcm to using dsp file, opening dsp > file will get errors. > I think it may be caused by the busy audio device. > Is there any methods that can indicate whether the audio device used by pcm is > free? Not quite, AFAIK. The server process keeps opening the device, so it actually "uses" it. BTW, with a recent version of ALSA drivers and libs, this server process won't be needed and won't be started at all. Think about updating the ALSA version, too. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
