2008/6/17 Takashi Iwai <tiwai@xxxxxxx>: > At Thu, 12 Jun 2008 20:32:51 +0200, > Christian Morales Vega wrote: >> >> 2008/6/12 Takashi Iwai <tiwai@xxxxxxx>: >> > It's unlikely a driver issue but an incompatibility of dmix, I guess. >> > But still I don't figure out why this happens. The hwsync is done at >> > each snd_pcm_dmix_delay() call (as long as slowptr is set, and it's so >> > as default). So, there shouldn't be any difference... >> > >> > What happens if you use "hw" or "plughw"? >> With both plughw and hw works fine. >> >> If helps, I have simplified the problematic bsnes code into this: > > The program looks running fine on my machine with another HD-audio > codec. What is expected in the output and how wrong on yours? I knew I should not put it under the code :-p "The listened effect is that when fails you listen the noise for just buffer_time, and when works the noise never ends." So the output with the SB Live! is: State: 2 Delay: 0 Passed State: 2 Delay: 882 Passed State: 2 Delay: 1764 Passed State: 2 Delay: 2646 Passed State: 2 Delay: 3528 Passed State: 3 Delay: 4410 Delay/Goal: 4410/3528 State: 3 Delay: 4410 Delay/Goal: 4410/3528 State: 3 Delay: 4410 Delay/Goal: 4410/3528 State: 3 Delay: 4410 Delay/Goal: 4410/3528 State: 3 Delay: 4409 Delay/Goal: 4409/3528 and so until delay reaches 3528, when a new snd_pcm_writei() is done. With the AD1988 the buffer is fulled one time. After that never again reaches snd_pcm_writei(). The output is: State: 2 Delay: 0 Passed State: 2 Delay: 940 Passed State: 2 Delay: 1880 Passed State: 2 Delay: 2820 Passed State: 2 Delay: 3760 Passed State: 3 Delay: 4700 Delay/Goal: 4700/3764 State: 3 Delay: 4700 Delay/Goal: 4700/3764 State: 3 Delay: 4700 Delay/Goal: 4700/3764 and so. Delay never decreases. But after some time you see. State: 4 Delay: 4700 Delay/Goal: 4700/3764 There has been an underrun even if appl_ptr is 4700 frames ahead of hw_ptr??? If you uncomment snd_pcm_avail_update() delay decreases and everything is ok. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
