> > I found that there will be a thread generated after calling snd_pcm_open(). > I use command 'ps' to check it. > Due to this I guess snd_pcm_writei() only put the data into the buffer of the > thread 'pcm'. > > This thread then schedules of mixes the audio data, and put it into the buffer > of ALSA driver. > ALSA ringbuffer only belongs to ALSA library, and ALSA driver uses anoother > buffer in kernel. > Thus, there must be a thread that can put the data in ALSA ringbuffer into the > buffer of ALSA driver. > I found that snd_pcm_direct_server_create() in ALSA library will create a thread. This resolves my problem that why ALSA library needn't use a daemon to mixing audio like other mixing server. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
