2010/2/5 Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
> On Thu, 4 Feb 2010, Raymond Yau wrote:
>
> I would see your reply sooner, if you used reply-to-all.
>
> > if LIBASOUND_DEBUG = 1 cannot tell you which parameter fail in
> hw_params() ,
> > you will need to define RULES_DEBUG in alsa-kernel/core/pcm_native.c and
> > compile driver with debug=verbose
> >
> > -#undef RULES_DEBUG
> > +#define RULES DEBUG 1
>
> That's already on too. Not sure what you mean by "compile driver with
> debug=verbose," supposedly, some kernel ALSA debug parameter. Since this
> is my driver, I can certainly add any debugging there, but it seems
> obvious to me, that the kernel is still getting a mono configuration,
> which shouldn't be the cae.
>
> > you can find out how ALSA refine the hw parameters by examing the system
> log
>
> If you mean "dmesg" output, then, as I said, there isn't much to look for
> there - the kernel is configured for mono...
>
> Thanks
> Guennadi
>
your output is quite different from mine
arecord -v -f cd -c 1 -d 30 -r 8000 -Dplughw:1,0 any.wav
Recording WAVE 'any.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
Plug PCM: Route conversion PCM (sformat=S16_LE)
Transformation table:
0 <- 0*0.5 + 1*0.5
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 3968
period_size : 992
period_time : 124000
tstamp_mode : NONE
period_step : 1
avail_min : 992
period_event : 0
start_threshold : 1
stop_threshold : 3968
silence_threshold: 0
silence_size : 0
boundary : 2080374784
Slave: Hardware PCM card 1 'HDA Intel' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
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