Hi,
On Mar 27 2018 03:42, Kirill Marinushkin wrote:
On 03/26/18 10:19, Takashi Sakamoto wrote:
Hi,
On Mar 26 2018 14:11, Kirill Marinushkin wrote:
Currently, all playback switches are described as mute. It is shown as:
[OO] == sound is on (left and right channels)
[MM] == sound is muted (left and right channels)
But cards can have different kinds of switch controls, not only mute. At
least usb-audio provides boolean controls as playback switches for:
* clock source validity (read only switch)
* processing features on/off (rw switch)
* potentially other similar use-cases
It becames confusing, because it is shown as:
[OO] == clock source is valid
[MM] == clock source is invalid
[OO] == processing feature is on
[MM] == processing feature is off
And from the help, it is not clear how to toggle such switches.
Could you show such control elements to help reviewers? For example, output from 'amixer' might be enough.
Hello Takashi Sakamoto,
I misread your message. You mean the amixer output, not the alsamixer.
Below I attach the output from amixer.
$ amixer -c2
Simple mixer control 'Clock Source 15 Validity',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Up Down',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Up Down Mode Select',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 1
Mono: 1 [100%]
Thanks. Then you can see corresponding control elements with the same
name in output of 'amixer -c2 contents'. I guess:
$ amixer -c 2 contents | grep -B1 -A1 BOOLEAN
...
numid=?,iface=MIXER,name='Clock Source 15 Validity'
; type=BOOLEAN,access=rw------,values=1
: values=on
numid=?,iface=MIXER,name='Up Down'
; type=BOOLEAN,access=rw------,values=1
: values=on
...
A control element of 'Up Down Mode Select' is not the one of BOOLEAN
type so it's not issued one in your patch.
For example, in my case (E-MU 0404 USB, kernel v4.13):
$ amixer -c 1
...
Simple mixer control 'AnalogueIn Soft Limit ',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Clock rate Selector',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 5
Mono: 0 [0%]
Simple mixer control 'DigitalIn CLK source External',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'DigitalOut format: SPDIF/AC3',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
These mixer elements are translated by alsa-lib's mixer API
implementation from control elements maintained by ALSA control core. In
my case:
$ amixer -c 1 contents | grep -B1 -A1 BOOLEAN
numid=4,iface=MIXER,name='PCM Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=on
--
numid=9,iface=MIXER,name='AnalogueIn Soft Limit '
; type=BOOLEAN,access=rw------,values=1
: values=on
--
numid=8,iface=MIXER,name='DigitalIn CLK source External'
; type=BOOLEAN,access=rw------,values=1
: values=off
numid=6,iface=MIXER,name='DigitalOut format: SPDIF/AC3'
; type=BOOLEAN,access=rw------,values=1
: values=off
Well, if your aim is just to focus on UI issue, it's enough to change
alsamixer. On the other hand, developers tend to add any control element
categorized to 'mixer' iface without enough care of its meaning. What
you see is this kind of control elements, I guess. If you wish to
suppress alsamixer to handle such non-traditional mixer controls (I mean
they're not for gain/level/pan/mute etc), it's better to have extra
care; e.g. backward compatibility.
Regards
Takashi Sakamoto
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