Garrett D'Amore wrote:
> Bart Smaalders wrote:
>> Garrett D'Amore wrote:
>>> Please let us know if there are any concerns about any of the above.
>>>
>>
>>
>> This looks good, Garrett. Can we also obsolete the ability to
>> disable the mixer in mixerctl? I don't want to force all applications
>> to have to deal with open calls to /dev/audio blocking indefinitely.
>
> Yes, I'm sorry -- I thought I had already indicated this in the
> inception materials. It is not possible to disable the mixer. All
> support for any kind of "exclusive mode" access was removed in the
> Boomer gate a long time ago. :-)
>
> I suppose there might be certain *ancient* applications this breaks...
> but such applications would not have played well with other uses of
> the audio device anyway (include any use by desktop environments like
> gnome!)
>
> -- Garrett
>
>
A few more notes on this topic:
mixerctl has other changes:
-e is silently ignored (and no longer documented)
-i has very slightly different output (the format was never documented)
-o returns a failure (you can't disable the mixer!)
-v no longer dumps a meaningful audio_info structure -- this structure
was intrinsic to SADA, and doesn't work well with OSS. The -v flag
still means "verbose", but the details are quite different. When used
by itself or with -i, no additional output is given:
gdamore at tabasco{27}> mixerctl -iv
Device: /dev/sound/0mixer
Name = audio810#0
Config = NVIDIA AC'97 (CK804)
HW Info = AC'97 codec: Avance Logic ALC655
And when used with new options, it tells you more about it. For
example, with -c volume to query information about the volume control:
gdamore at tabasco{30}> mixerctl -c volume
DEVICE CONTROL VALUE
POSSIBLE
audio810#0 volume 75
0-100
gdamore at tabasco{32}> mixerctl -v -c volume
Device: /dev/sound/0mixer
Name = audio810#0
Config = NVIDIA AC'97 (CK804)
HW Info = AC'97 codec: Avance Logic ALC655
CONTROL VALUE TYPE POSSIBLE
volume 75 mono 0-100
With -C (dump all controls) it will show lots of information about each
control:
gdamore at tabasco{33}> mixerctl -v -C
Device: /dev/sound/sndstat
Name = audio#0
Config = Audio Common Code (pseudo)
CONTROL VALUE TYPE POSSIBLE
Device: /dev/sound/0mixer
Name = audio810#0
Config = NVIDIA AC'97 (CK804)
HW Info = AC'97 codec: Avance Logic ALC655
CONTROL VALUE TYPE POSSIBLE
volume 75 mono 0-100
front 75:75 stereo 0-100:0-100
surround 75:75 stereo 0-100:0-100
center 75 mono 0-100
lfe 75 mono 0-100
record-gain 18:12 stereo 0-100:0-100
mic 0:0 stereo 0-100:0-100
line-in 0:0 stereo 0-100:0-100
cd 0:0 stereo 0-100:0-100
aux1-in 0:0 stereo 0-100:0-100
phone 0 mono 0-100
beep 75 mono 0-100
micboost off boolean on,off
loopback off boolean on,off
record-source mic enum mic,cd,aux1-in
line-in,stereo-mix
mono-mix,phone
mic-source mic1 enum mic1,mic2
jack1 line-in enum line-in,surround
jack2 mic enum mic,center/lfe
And, when used with -c <control> -w <value>, it shows the effect being
changed:
gdamore at tabasco{34}> mixerctl -v -c volume -w 50
audio810#0: 'volume' set to '50'
The fact is, that dumping the audio_info_t structure, while documented,
was unlikely to have ever been particularly useful to anyone. We
believe that the new output formats are far more useful, and somewhat in
line with other commands like dladm. (And yes, we're working on a
"parseable" version of the above formats, as well. That work is still
not complete yet.)
-- Garrett
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