[alsa-devel] [PATCH 06/11] ucm: docs: Add DisableSoftwareVolume

[Jaroslav Kysela]

Dne 07. 11. 19 v 2:58 Curtis Malainey napsal(a):
> Some userspace audio servers might default to software volume, this
> allows the ucm to force its behaviour
> 
> Signed-off-by: Curtis Malainey <cujomalainey at chromium.org>
> ---
>   include/use-case.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/include/use-case.h b/include/use-case.h
> index 05628303..1aeaf9d4 100644
> --- a/include/use-case.h
> +++ b/include/use-case.h
> @@ -334,6 +334,8 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
>    *      - This is used on platform where reported buffer level is not accurate.
>    *        E.g. "512", which holds 512 samples in device buffer. Note: this will
>    *        increase latency.
> + *   - DisableSoftwareVolume
> + *      - Set to "1" to force userspace to use hardware volume controls
>    */
>   int snd_use_case_get(snd_use_case_mgr_t *uc_mgr,
>                        const char *identifier,
> 


My understanding is that if the hardware volume controls are defined in UCM, 
then the UCM user (audio server) should use them. Otherwise, the software 
volume control should be applied. I don't see the reason to have this info 
doubled.

					Jaroslav

-- 
Jaroslav Kysela <perex at perex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.