Lennart Poettering wrote: > Hi! > > In PulseAudio I want to schedule on my own when I need to write audio > data into the device and when not. To achieve that I want to be > notified via poll() whenever a period boundary is passed (i.e. when an > IRQ happens), but only then. That's different from the usual mode > where you are notified via poll() whether there is space in the > playback buffer that needs to be filled up. > > On OSS the mmap() mode enables a mode like I described above. After > enabling mmap() the application can decide by itself what it considers > full and what empty in the dma buffer, and use GETOPTR to query the > playback position. poll() on the OSS fd will directly reflect the > sound card IRQs and is not influenced if you ever wrote data to device > or not. > > I assume that I can enable a mode like that with one of the SW > params. But quite frankly the docs for it are not enlighening at all. > > Lennart > What would you want to do that for? Surely you just want to be told "I need X samples now please", and that is what the current alsa poll/callback method does. James _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
