[alsa-devel] Fwd: ALSA queries

[Chakravarthi Pradeep]

>In the case above it's in frames.  But it can be defined in bytes
>depending on the hardware spec.  Some hardware defines in the time
>unit (like msec), too.

Can you please tell me how to define in bytes ?

>Now you know it.  And remember that PA is often die-hard.
So it means that I can not do rmmod until pulseaudio is removed , is
it correct ?

Regards,
Chakravarthi
On Tue, Aug 7, 2018 at 6:45 PM Takashi Iwai <tiwai at suse.de> wrote:
>
> On Tue, 07 Aug 2018 15:12:08 +0200,
> Chakravarthi Pradeep wrote:
> >
> > Dear Takashi,
> >
> > Thanks for your reply.
> >
> > > The "period" in ALSA PCM definition represents the interval time (or
> > > frames) of the periodical interrupts on the ring buffer.  If the irq
> > > is issued for each 256 frames while the ring buffer size is 1024
> > > frames, periods = 1024/256 = 4.  The periods_min defines the minimal
> > > number of periods the hardware may accept.
> >
> > Is it  256 frames or  256 bytes ?
>
> In the case above it's in frames.  But it can be defined in bytes
> depending on the hardware spec.  Some hardware defines in the time
> unit (like msec), too.
>
> > fuser -v /dev/snd/* output is
> >                                          USER
> >   PID   ACCESS    COMMAND
> > /dev/snd/controlC0         Dell                                   1815
> > F.....           pulseaudio
>
> Now you know it.  And remember that PA is often die-hard.
>
>
> Takashi



-- 
Thanks and Regards
Chakravarthi Pradeep.K
Ph: 91 9980434900