Re: Volume per voices [Feature Request]

[Raymond <rayau@netvigator.com>]

Clemens Ladisch wrote:
> Raymond wrote:
> 
>>In theory, and sound cards with hardware mixing can support this kind of
>>volume control.
>>
>>au88x0 driver may provide this kind of volume control on playing PCM
>>streams by using hardware mixers.
>>
>>However the hardware mixers are dynamically allocated in routine
>>snd_vortex_pcm_hw_params(), this means that the kcontrol can be put/get
>>only between snd_pcm_hw_params() (return no error) and
>>snd_pcm_hw_free()/snd_pcm_close().
> 
> 
> The driver could save the value and apply it when a stream is opened.
> 
>
>>Is there any flag in kcontrol which enable/disable the put/get from
>>mixer application ?
>
>
> Controls can be locked.
>
>

What is the meaning of SNDRV_CTL_ELEM_ACCESS_INACTIVE ?

Is it just a flag which the driver should check whether the value can be
written to the hardware registers ?

It seem to me that snd_vortex_pcm_adb_vol_put() are called even when
kcontrol is inactive (e.g alsactl restore after the driver is loaded)

What value (0 or 1) will be return by snd_vortex_pcm_adb_vol_put() when
kcontrol is inactive/locked ?









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