About the matrix control...

About the matrix control...

[Giuliano Pochini]

About the matrix control, what did you decide ?


Bye.




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Re: About the matrix control...

[Takashi Iwai]

At 06 Apr 2003 22:35:56 +0000,
Giuliano Pochini wrote:
> 
> 
> About the matrix control, what did you decide ?

it's accessed via normal control API.
you can create "duplicated" entries by specifying the count field for
snd_kcontrol_new_t.  for each duplicated entry, only the volatile part
is created uniquely, which is accessed via ctl->vd[index].


Takashi


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Re: About the matrix control...

[Giuliano Pochini]

>> About the matrix control, what did you decide ?
> it's accessed via normal control API.
> you can create "duplicated" entries by specifying the count field for
> snd_kcontrol_new_t.  for each duplicated entry, only the volatile part
> is created uniquely, which is accessed via ctl->vd[index].

I can't think of any use of ->vd... Inside callbacks do I get the
control number by kcontrol->index ?  Ok, but why ?  It was much simpler
to make struct sndrv_ctl_elem_value.value.integer.value[] larger or put
data in .value_ptr-> . What am I missing ?

Bye.




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Re: About the matrix control...

[Jaroslav Kysela]

On 10 Apr 2003, Giuliano Pochini wrote:

> 
> >> About the matrix control, what did you decide ?
> > it's accessed via normal control API.
> > you can create "duplicated" entries by specifying the count field for
> > snd_kcontrol_new_t.  for each duplicated entry, only the volatile part
> > is created uniquely, which is accessed via ctl->vd[index].
> 
> I can't think of any use of ->vd... Inside callbacks do I get the
> control number by kcontrol->index ?  Ok, but why ?  It was much simpler
> to make struct sndrv_ctl_elem_value.value.integer.value[] larger or put
> data in .value_ptr-> . What am I missing ?

Please, reread the thread. It's better to lock only one element than
whole row (one dimension) in the matrix. Imagine applications sharing only 
a part of matrix.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs



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