John Donson wrote: > I want to realize an application that features a constant but realtime > adjustable So, "_not_ constant". :) > delay between playback and capture PulseAudio does this. > I know this can be accomplished by proper buffer length settings for > a fixed delay. But it should be adjustable to use it for other purpose > as well. Unfortunately I am not able to find a detailed diagram how > alsa uses its ring-buffer and how interrupts do affect delay as well. When you write into a specific position in the buffer where the hardware has just finished playing, the time until the hardware plays this data is the buffer length. This is the maximum latency. Interrupts (at period boundaries) are used to wake up the application when it waits for more free space to become available. PulseAudio reduces latency by not filling the entire buffer. It ignores period boundaries and wakes up by using its own timer. Regards, Clemens ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
