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

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@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