On Tue, Nov 9, 2010 at 6:21 PM, Jaroslav Kysela <perex@xxxxxxxx> wrote: > On Tue, 9 Nov 2010, Manu Abraham wrote: > >> On Tue, Nov 9, 2010 at 5:31 PM, Jaroslav Kysela <perex@xxxxxxxx> wrote: >>> >>> On Tue, 9 Nov 2010, Manu Abraham wrote: >>> >>>> testbox ~ # arecord -Dhw:2,0 >>>> Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono >>> >>>> Any idea, why saa7231_hw_params is not getting invoked ? >>> >>> Your hw probably does not support directly 8-bit sample at 8000Hz, one >>> channel. Use 'plughw:2,0' device instead 'hw:2,0' to let alsa-lib do all >>> stream format conversions. >> >> That didn't make any difference at all. > > Check your code. You probably created wrong hw_ops, looking to your code: > > .buffer_bytes_max = 512 * 4096, > .period_bytes_min = 8192, > .period_bytes_max = 8192, > .periods_min = 8192, > .periods_max = 8192, > > It's definitely an empty configuration space. > > You have buffer_bytes_max 2097152, but restricted number of periods to 8192 > and period_bytes to 8192. > > 8192 * 8192 = 67108864 which is not less than 2097152 (and I'm not counting > the bytes for channels and formats). Bingo, the ALSA PCM code does not know > what to configure. > > Decrease periods_min and probably also periods_max. > oh ! The error message was really a weird one. I can say that the hardware can do 192 audio frames in an interrupt, whatever the frame size is. So, what periods and period_bytes should I describe in the configuration ? Best Regards, Manu _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
