* Spdif: Control interface
@ 2011-11-08 14:01 ajay khandelwal
2011-11-08 20:43 ` Pavel Hofman
0 siblings, 1 reply; 6+ messages in thread
From: ajay khandelwal @ 2011-11-08 14:01 UTC (permalink / raw)
To: alsa-devel
Hi All,
On my PC SPDIF control is exposing mute and volume control.
I understand for mute but how volume control is exported for digital audio.
Best Regards,
Ajay
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Spdif: Control interface
2011-11-08 14:01 Spdif: Control interface ajay khandelwal
@ 2011-11-08 20:43 ` Pavel Hofman
2011-11-09 5:28 ` ajay khandelwal
0 siblings, 1 reply; 6+ messages in thread
From: Pavel Hofman @ 2011-11-08 20:43 UTC (permalink / raw)
To: ajay khandelwal; +Cc: alsa-devel
Dne 8.11.2011 15:01, ajay khandelwal napsal(a):
> Hi All,
> On my PC SPDIF control is exposing mute and volume control.
>
> I understand for mute but how volume control is exported for digital audio.
>
Please post output of amixer contents to see the details.
Thanks,
Pavel.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Spdif: Control interface
2011-11-08 20:43 ` Pavel Hofman
@ 2011-11-09 5:28 ` ajay khandelwal
2011-11-09 7:50 ` Pavel Hofman
0 siblings, 1 reply; 6+ messages in thread
From: ajay khandelwal @ 2011-11-09 5:28 UTC (permalink / raw)
To: Pavel Hofman; +Cc: alsa-devel
Hi Pavel,
Thanks for reply
Following is output of amixer.
you can search with iec958
[root@dlhl1071 smp_scripts]# amixer
Simple mixer control 'Master',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB] [off]
Front Right: Playback 31 [100%] [0.00dB] [off]
Simple mixer control 'Master Mono',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 31
Mono: Playback 0 [0%] [-46.50dB] [off]
Simple mixer control 'Headphone',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB] [on]
Front Right: Playback 31 [100%] [0.00dB] [on]
Simple mixer control 'Headphone Jack Sense',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'PCM',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [12.00dB] [on]
Front Right: Playback 31 [100%] [12.00dB] [on]
Simple mixer control 'Line',0
Capabilities: pvolume pswitch cswitch cswitch-exclusive penum
Capture exclusive group: 0
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: Playback 0 - 31
Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]
Simple mixer control 'Line Jack Sense',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'CD',0
Capabilities: pvolume pswitch cswitch cswitch-exclusive penum
Capture exclusive group: 0
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: Playback 0 - 31
Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]
Simple mixer control 'Mic',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch
cswitch-exclusive penum
Capture exclusive group: 0
Playback channels: Mono
Capture channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono: Playback 0 [0%] [-34.50dB] [off]
Front Left: Capture [on]
Front Right: Capture [on]
Simple mixer control 'Mic Boost (+20dB)',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Mic Select',0
Capabilities: enum
Items: 'Mic1' 'Mic2'
Item0: 'Mic2'
Simple mixer control 'Video',0
Capabilities: cswitch cswitch-exclusive penum
Capture exclusive group: 0
Capture channels: Front Left - Front Right
Front Left: Capture [off]
Front Right: Capture [off]
Simple mixer control 'Phone',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch
cswitch-exclusive penum
Capture exclusive group: 0
Playback channels: Mono
Capture channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono: Playback 0 [0%] [-34.50dB] [off]
Front Left: Capture [off]
Front Right: Capture [off]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'IEC958 Playback AC97-SPSA',0
Capabilities: volume volume-joined penum
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 3
Mono: 3 [100%]
Simple mixer control 'IEC958 Playback Source',0
Capabilities: enum
Items: 'AC-Link' 'A/D Converter'
Item0: 'AC-Link'
Simple mixer control 'Aux',0
Capabilities: pvolume pswitch cswitch cswitch-exclusive penum
Capture exclusive group: 0
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: Playback 0 - 31
Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]
Simple mixer control 'Mono Output Select',0
Capabilities: enum
Items: 'Mix' 'Mic'
Item0: 'Mix'
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 15
Front Left: Capture 15 [100%] [22.50dB] [on]
Front Right: Capture 15 [100%] [22.50dB] [on]
Simple mixer control 'Mix',0
Capabilities: cswitch cswitch-exclusive penum
Capture exclusive group: 0
Capture channels: Front Left - Front Right
Front Left: Capture [off]
Front Right: Capture [off]
Simple mixer control 'Mix Mono',0
Capabilities: cswitch cswitch-exclusive penum
Capture exclusive group: 0
Capture channels: Front Left - Front Right
Front Left: Capture [off]
Front Right: Capture [off]
Simple mixer control 'External Amplifier',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Stereo Mic',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
On Wed, Nov 9, 2011 at 2:13 AM, Pavel Hofman <pavel.hofman@ivitera.com>wrote:
>
> Dne 8.11.2011 15:01, ajay khandelwal napsal(a):
> > Hi All,
> > On my PC SPDIF control is exposing mute and volume control.
> >
> > I understand for mute but how volume control is exported for digital
> audio.
> >
>
> Please post output of amixer contents to see the details.
>
> Thanks,
>
> Pavel.
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Spdif: Control interface
2011-11-09 5:28 ` ajay khandelwal
@ 2011-11-09 7:50 ` Pavel Hofman
2011-11-09 8:13 ` Takashi Iwai
0 siblings, 1 reply; 6+ messages in thread
From: Pavel Hofman @ 2011-11-09 7:50 UTC (permalink / raw)
To: ajay khandelwal; +Cc: alsa-devel
Dne 9.11.2011 06:28, ajay khandelwal napsal(a):
> Hi Pavel,
> Thanks for reply
>
> Simple mixer control 'IEC958 Playback AC97-SPSA',0
> Capabilities: volume volume-joined penum
> Playback channels: Mono
> Capture channels: Mono
> Limits: 0 - 3
> Mono: 3 [100%]
Thanks. I assume you mean this control. For meaning of this control see
e.g. http://alsa.opensrc.org/Realtek_ALC650#SPDIF_support
It is not related to volume, IMO capabilities of this control are
incorrect, there should be "enum" instead. Perhaps changing
SNDRV_CTL_ELEM_TYPE_INTEGER to SNDRV_CTL_ELEM_TYPE_ENUMERATED ?
The code around this control is
http://git.alsa-project.org/?p=alsa-kmirror.git;a=blob;f=pci/ac97/ac97_codec.c;hb=HEAD#l874
. Perhaps the
.info = snd_ac97_info_volsw
should use a different method, setting the ENUM type.
Unfortunately, I do not have the HW to test any changes.
Regards,
Pavel.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Spdif: Control interface
2011-11-09 7:50 ` Pavel Hofman
@ 2011-11-09 8:13 ` Takashi Iwai
2011-11-09 8:19 ` Pavel Hofman
0 siblings, 1 reply; 6+ messages in thread
From: Takashi Iwai @ 2011-11-09 8:13 UTC (permalink / raw)
To: Pavel Hofman; +Cc: ajay khandelwal, alsa-devel
At Wed, 09 Nov 2011 08:50:12 +0100,
Pavel Hofman wrote:
>
> Dne 9.11.2011 06:28, ajay khandelwal napsal(a):
> > Hi Pavel,
> > Thanks for reply
> >
> > Simple mixer control 'IEC958 Playback AC97-SPSA',0
> > Capabilities: volume volume-joined penum
> > Playback channels: Mono
> > Capture channels: Mono
> > Limits: 0 - 3
> > Mono: 3 [100%]
>
> Thanks. I assume you mean this control. For meaning of this control see
> e.g. http://alsa.opensrc.org/Realtek_ALC650#SPDIF_support
>
> It is not related to volume, IMO capabilities of this control are
> incorrect, there should be "enum" instead. Perhaps changing
> SNDRV_CTL_ELEM_TYPE_INTEGER to SNDRV_CTL_ELEM_TYPE_ENUMERATED ?
Yes, from the design POV, it should have been an enum.
But changing this would break many working user-space setups, so no-go
for now. Since AC97 is a legacy stuff, the worst thing is to break
something.
Takashi
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Spdif: Control interface
2011-11-09 8:13 ` Takashi Iwai
@ 2011-11-09 8:19 ` Pavel Hofman
0 siblings, 0 replies; 6+ messages in thread
From: Pavel Hofman @ 2011-11-09 8:19 UTC (permalink / raw)
To: Takashi Iwai; +Cc: ajay khandelwal, alsa-devel
Dne 9.11.2011 09:13, Takashi Iwai napsal(a):
> At Wed, 09 Nov 2011 08:50:12 +0100,
> Pavel Hofman wrote:
>>
>> Dne 9.11.2011 06:28, ajay khandelwal napsal(a):
>>> Hi Pavel,
>>> Thanks for reply
>>>
>>> Simple mixer control 'IEC958 Playback AC97-SPSA',0
>>> Capabilities: volume volume-joined penum
>>> Playback channels: Mono
>>> Capture channels: Mono
>>> Limits: 0 - 3
>>> Mono: 3 [100%]
>>
>> Thanks. I assume you mean this control. For meaning of this control see
>> e.g. http://alsa.opensrc.org/Realtek_ALC650#SPDIF_support
>>
>> It is not related to volume, IMO capabilities of this control are
>> incorrect, there should be "enum" instead. Perhaps changing
>> SNDRV_CTL_ELEM_TYPE_INTEGER to SNDRV_CTL_ELEM_TYPE_ENUMERATED ?
>
> Yes, from the design POV, it should have been an enum.
> But changing this would break many working user-space setups, so no-go
> for now. Since AC97 is a legacy stuff, the worst thing is to break
> something.
Fair enough :)
Thanks,
Pavel.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-11-09 8:19 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-11-08 14:01 Spdif: Control interface ajay khandelwal
2011-11-08 20:43 ` Pavel Hofman
2011-11-09 5:28 ` ajay khandelwal
2011-11-09 7:50 ` Pavel Hofman
2011-11-09 8:13 ` Takashi Iwai
2011-11-09 8:19 ` Pavel Hofman
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