From: Arijit De <arijit.de@geosemi.com>
To: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>
Subject: stereo uac device control over mixer
Date: Mon, 4 May 2015 08:34:16 +0000 [thread overview]
Message-ID: <1430728456157.40941@geosemi.com> (raw)
Hi,
I am working on a USB audio MIC device(capture device),
implemented UAC1.0 spec inside the firmware for that,
my device is a stereo uac capture? device.
I am trying to enable left and write channel separate control(volume, mute etc.) over mixer interface.
my understanding about how to enable channel specific control is
in UAC Feature Unit Descriptor
if I add bmaControls(0) and bmaControls(1) with correct bitmap for Mute & Volume support
amixer is able to identify my device as a two MIC device,
amixer output for my usb audio capture device
**********************************
Simple mixer control 'Mic',0
Capabilities: cvolumecaps joined 780
cvolume-joined cswitch cswitch-joined
Capture channels: Mono
Limits: Capture 0 - 15
Mono: Capture 9 [60%] [27.00dB] [on]
Simple mixer control 'Mic',1
Capabilities: cvolumecaps joined 780
cvolume-joined cswitch cswitch-joined
Capture channels: Mono
Limits: Capture 0 - 15
Mono: Capture 9 [60%] [27.00dB] [on]
**********************************
is the correct way of achieving it
OR
ideally there should be a single Mic with "Front Left - Front Right" support ?
Thanks
Arijit
next reply other threads:[~2015-05-04 8:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-04 8:34 Arijit De [this message]
2015-05-04 13:03 ` stereo uac device control over mixer Clemens Ladisch
2015-05-05 4:31 ` Arijit De
2015-05-05 13:45 ` Clemens Ladisch
2015-05-11 15:28 ` Arijit De
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