Hi Takashi,
On Mon, Sep 04, 2006 at 08:28:32PM +0200, Takashi Iwai wrote:
> OK, maybe the problem is its naming.
I ignored this for the moment. Once we are sure how many controls
there are, we can think about the naming.
> % amixer set "PCM Gain" 2
> % amixer set "PCM Gain" 0
> % amixer set "Capture" 0
> % amixer set "Capture" 80%
> recording...
>
> % amixer set "PCM Gain" 0
> % amixer set "PCM Gain" 2
> % amixer set "Capture" 0
> % amixer set "Capture" 80%
> recording...
>
> If the volumes of two cases are same, the IPGA isn't independent and
> both controls should be merged to a single control.
I read the AK4524 data sheet and I see now what you mean. The
descriptions there are almost identical.
I tried the following. My amixer output is at the end of the mail for
reference. first I created two shell scripts:
-- s1.sh -------------------------------------------------------------
#! /bin/sh
amixer set "PCM Capture Gain" 2
amixer set "PCM Capture Gain" 0
amixer set "PCM" 0
amixer set "PCM" 80%
----------------------------------------------------------------------
-- s2.sh -------------------------------------------------------------
#! /bin/sh
amixer set "PCM Capture Gain" 0
amixer set "PCM Capture Gain" 2
amixer set "PCM" 0
amixer set "PCM" 80%
----------------------------------------------------------------------
and then I run the following command on the shell
while true; do ./s1.sh; sleep 1; ./s2.sh; sleep 1; done
While this was running I recorded a wav file with arecord. The volume
of the recorded file was extremely low (is this normal?) so I
normalised it with audacity. I looked at the wave form in audacity
and I played the normalised file with alsamixer.
Results:
1) I cannot hear or see the difference between the settings from s1.sh
and s2.sh.
2) As a test I tried the following: I can hear (and maybe just see)
the difference between 80% (value 102) and 82% (value 104). I cannot
notice any difference between 80% (value 102) and 81% (value 103).
Do you have any idea how different the volumes would be if IPGA and
DATT were independent?
All the best,
Jochen
-- amixer output -----------------------------------------------------
Simple mixer control 'PCM',0
Capabilities: pvolume cvolume cswitch cswitch-joined
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: Playback 0 - 127 Capture 0 - 127
Front Left: Playback 102 [80%] Capture 102 [80%] [on]
Front Right: Playback 102 [80%] Capture 102 [80%] [on]
Simple mixer control 'PCM Capture Gain',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 36
Front Left: 2 [6%]
Front Right: 2 [6%]
Simple mixer control 'PCM Center',0
Capabilities: pvolume pvolume-joined
Playback channels: Mono
Limits: Playback 0 - 127
Mono: Playback 127 [100%]
Simple mixer control 'PCM LFE',0
Capabilities: pvolume pvolume-joined
Playback channels: Mono
Limits: Playback 0 - 127
Mono: Playback 127 [100%]
Simple mixer control 'PCM Rear',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 127 [100%]
Front Right: Playback 127 [100%]
Simple mixer control 'IEC958',0
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'H/W In 0'
Simple mixer control 'IEC958 Output',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'IEC958',1
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'H/W In 1'
Simple mixer control 'Deemphasis',0
Capabilities: enum
Items: '44.1kHz' 'Off' '48kHz' '32kHz'
Item0: 'Off'
Simple mixer control 'H/W',0
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'PCM Out'
Simple mixer control 'H/W',1
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'PCM Out'
Simple mixer control 'H/W',2
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'H/W In 0'
Simple mixer control 'H/W',3
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'H/W In 1'
Simple mixer control 'H/W',4
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'IEC958 In L'
Simple mixer control 'H/W',5
Capabilities: enum
Items: 'PCM Out' 'H/W In 0' 'H/W In 1' 'IEC958 In L' 'IEC958 In R'
Item0: 'IEC958 In R'
Simple mixer control 'Multi Track Internal Clock',0
Capabilities: enum
Items: '8000' '9600' '11025' '12000' '16000' '22050' '24000' '32000' '44100' '48000' '64000' '88200' '96000' '176400' '192000' 'IEC958 Input'
Item0: '44100'
Simple mixer control 'Multi Track Peak',0
Capabilities: volume
Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front Center - Woofer - Side Left - Side Right - Rear Center - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
Capture channels: Front Left - Front Right - Rear Left - Rear Right - Front Center - Woofer - Side Left - Side Right - Rear Center - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
Limits: 0 - 255
Front Left: 0 [0%]
Front Right: 0 [0%]
Rear Left: 0 [0%]
Rear Right: 0 [0%]
Front Center: 0 [0%]
Woofer: 0 [0%]
Side Left: 0 [0%]
Side Right: 0 [0%]
Rear Center: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
?: 0 [0%]
Simple mixer control 'Multi Track Rate Locking',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Multi Track Rate Reset',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
----------------------------------------------------------------------
Attachment:
signature.asc
Description: Digital signature
------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
