Re: stereo uac device control over mixer

[Arijit De <arijit.de@geosemi.com>]

Hi Clemens,

I want to do Left/Right Mic mute independently,
but I dont see that kind of control is provided in alsamixer(GUI) for capture devices.

Is Left/Right Mic mute is supported ?

because I can see a api for the same
snd_mixer_selem_set_capture_switch (snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, int value);

Thanks
Arijit
________________________________________
From: Clemens Ladisch <clemens@ladisch.de>
Sent: Tuesday, May 5, 2015 7:15 PM
To: Arijit De; alsa-devel@alsa-project.org
Subject: Re: [alsa-devel] stereo uac device control over mixer

Arijit De wrote:
>       AudioControl Interface Descriptor:
>         bLength                 9
>         bDescriptorType        36
>         bDescriptorSubtype      6 (FEATURE_UNIT)
>         bUnitID                 2
>         bSourceID               1
>         bControlSize            1
>         bmaControls( 0)      0x03
>           Mute Control
>           Volume Control

These are the controls for the master channel.

>         bmaControls( 1)      0x03
>           Mute Control
>           Volume Control

These are the controls for the mic's left channel.

>         iFeature                0

The controls for the mic's right channel are missing.


There are no descriptors for playback, but this does not matter for the
mixer.


Regards,
Clemens