On Fri, 29 Oct 2010, Raymond Yau wrote: >>> On Sat, 30 Jan 2010, Louise Hoffman wrote: > >>> Dear ALSA developers, >>> >>> When I compile ALSA's pcm_min.c[0] example with >>> >>> gcc -Wall -lasound pcm_min.c -o pcm_min >>> >>> Everything is fine, but running it, I get the white noise as expected, >>> but I also get this warning/error: >>> >>> Short write (expected 16384, wrote 7616) > >> It was a bug in alsa-lib. I fixed it in patch bellow. Thank you for your >> report. > >> http://git.alsa-project.org/?p=alsa-lib.git;a=commitdiff;h=2e48439ad93f6c8d99a2d72928ac71285b5211bb <http://git.alsa-project.org/?p=alsa-lib.git;a=commitdiff;h=2e48439ad93f6c8d99a2d72928ac71285b5211bb> > > Add snd_pcm_dump() after call snd_pcm_set_params in pcm_min.c > > The start threshold is equal to buffer size , so there should be a > short write at the second write since > 16384 + 7616 = 24000 ( start threshold ) > > your patch had changed the behaviour The pcm_min uses the blocked mode, so all layers tries to queue all given samples and wait for the ring buffer. > buffer_size : 24000 > start_threshold : 24000 > state = 2 > write 16384 frames > state = 2 > write 16384 frames > state = 3 This looks correct. Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
