[alsa-devel] Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII

[Raymond Yau]

2010/2/20 Jaroslav Kysela <perex at perex.cz>

> On Fri, 19 Feb 2010, James Courtier-Dutton wrote:
>
> > On 19 February 2010 08:17, Jaroslav Kysela <perex at perex.cz> wrote:
> >> On Thu, 18 Feb 2010, Lennart Poettering wrote:
> >>
> >>>> For the Mic Boost +20dB case , how PA handle this +20dB switch in the
> "Flat
> >>>> Volume" model if you did not expost the Mic Boost switch to the user
> in the
> >>>> mixer control ?
> >>>>
> >>>> +20dB is quite significant in with the Capture Volume control
> >>>
> >>> We currently don't cover boost switches, simply because tehre is no dB
> >>> data queriable for them.
> >>>
> >>> I'd really prefer if those boost switches would be turned into binary
> >>> volume elements which carry normal dB information like any other
> >>> volume element. After all they are just a volume element, with only
> >>> two steps.
> >>
> >> I like this idea.
> >>
> >
> > Seems like a good idea but what should we call it.
> > If we already have a mic capture gain control, what shall we call the
> > mic boost gain control so as not to confuse it with each other?
> > Would keeping its current name be OK?
>
> I would keep the Boost suffix. It's easy to understand.
>
>                                        Jaroslav
>
> -


Some HDA codec has Front Mic Boost and Mic Boost  and three sets of input
sources

it is not easy to know the exact audio path

Card hw:1 'Intel'/'HDA Intel at 0xff9f4000 irq 22'
  Mixer name    : 'Analog Devices AD1988'
  Components    : 'HDA:11d41988'
  Controls      : 48
  Simple ctrls  : 26


    control.25 {
        comment.access 'read write'
        comment.type INTEGER
        comment.count 2
        comment.range '0 - 3'
        comment.dbmin 0
        comment.dbmax 3000
        iface MIXER
        name 'Front Mic Boost'
        value.0 0
        value.1 0
    }
    control.26 {
        comment.access 'read write'
        comment.type INTEGER
        comment.count 2
        comment.range '0 - 3'
        comment.dbmin 0
        comment.dbmax 3000
        iface MIXER
        name 'Mic Boost'
        value.0 0
        value.1 0
    }

    control.27 {
        comment.access 'read write'
        comment.type INTEGER
        comment.count 2
        comment.range '0 - 54'
        comment.dbmin -5850
        comment.dbmax 2250
        iface MIXER
        name 'Capture Volume'
        value.0 39
        value.1 39
    }
    control.28 {
        comment.access 'read write'
        comment.type BOOLEAN
        comment.count 2
        iface MIXER
        name 'Capture Switch'
        value.0 false
        value.1 false
    }
    control.29 {
        comment.access 'read write'
        comment.type INTEGER
        comment.count 2
        comment.range '0 - 54'
        comment.dbmin -5850
        comment.dbmax 2250
        iface MIXER
        name 'Capture Volume'
        index 1
        value.0 39
        value.1 39
    }
    control.30 {
        comment.access 'read write'
        comment.type BOOLEAN
        comment.count 2
        iface MIXER
        name 'Capture Switch'
        index 1
        value.0 false
        value.1 false
    }
    control.31 {
        comment.access 'read write'
        comment.type INTEGER
        comment.count 2
        comment.range '0 - 54'
        comment.dbmin -5850
        comment.dbmax 2250
        iface MIXER
        name 'Capture Volume'
        index 2
        value.0 39
        value.1 39
    }
    control.32 {
        comment.access 'read write'
        comment.type BOOLEAN
        comment.count 2
        iface MIXER
        name 'Capture Switch'
        index 2
        value.0 false
        value.1 false
    }
    control.33 {
        comment.access 'read write'
        comment.type ENUMERATED
        comment.count 1
        comment.item.0 'Front Mic'
        comment.item.1 Line
        comment.item.2 Mic
        comment.item.3 CD
        comment.item.4 Mix
        iface MIXER
        name 'Input Source'
        value Mic
    }
    control.34 {
        comment.access 'read write'
        comment.type ENUMERATED
        comment.count 1
        comment.item.0 'Front Mic'
        comment.item.1 Line
        comment.item.2 Mic
        comment.item.3 CD
        comment.item.4 Mix
        iface MIXER
        name 'Input Source'
        index 1
        value 'Front Mic'
    }
    control.35 {
        comment.access 'read write'
        comment.type ENUMERATED
        comment.count 1
        comment.item.0 'Front Mic'
        comment.item.1 Line
        comment.item.2 Mic
        comment.item.3 CD
        comment.item.4 Mix
        iface MIXER
        name 'Input Source'
        index 2
        value 'Front Mic'
    }