Hi Clemens,
Am 10.09.2010 09:18, schrieb Clemens Ladisch:
> I'm using the mixer_vol_tlv TLV
>> callback right now but I'm not sure it produces correct data.
>>
> Try alsamixer. Or just post the output of "amixer contents" here.
>
>
Well, according to alsamixer the mixer values are mapped to a range from
0 to -128 dB.
'amixer contents' show entries of the form
numid=112,iface=MIXER,name='DIn8 - Out7 Playback Volume'
; type=INTEGER,access=rw---R--,values=1,min=0,max=32768,step=0
: values=-32768
| unk-4-0xffffce00,0x00000000,
(numid and name changing of xourse for each control ).
Here are some examples of setting values with amixer:
:~$ amixer -c 2 cset numid=1 50%
numid=1,iface=MIXER,name='AIn1 - Out1 Playback Volume'
; type=INTEGER,access=rw---R--,values=1,min=0,max=32768,step=0
: values=16384
| unk-4-0xffffce00,0x00000000,
:~$ amixer -c 2 cset numid=1 80%
numid=1,iface=MIXER,name='AIn1 - Out1 Playback Volume'
; type=INTEGER,access=rw---R--,values=1,min=0,max=32768,step=0
: values=26215
| unk-4-0xffffce00,0x00000000,
:~$ amixer -c 2 cset numid=1 100%
numid=1,iface=MIXER,name='AIn1 - Out1 Playback Volume'
; type=INTEGER,access=rw---R--,values=1,min=0,max=32768,step=0
: values=32768
| unk-4-0xffffce00,0x00000000,
cat /proc/asound/F8R/usbmixer gives lines like this:
Unit: 5
Control: name="DIn8 - Out7 Playback Volume", index=0
Info: id=5, control=7, cmask=0x8000, channels=1, type="S16"
Volume: min=-32768, max=0, dBmin=-12800, dBmax=0
How do I tell the controls value range is correctly mapped to the dB values?
Kind regards,
Felix
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