Re: mixer control - Captuer Source - rename item name in enumerated control

[Raymond <rayau@netvigator.com>]

Is it possible to detect which daugther card is connected (e.g Yamaha
DB50XG, TurtleBeach Cancun FX, Roland SCD-15...) and replace "Video"
with the name of daugther card on the mixer control ?

The hardware driver know how the hardware are connected more than the
alsa-lib

Not only the capture source will need to be changed.

numid=33,iface=MIXER,name='Video Playback Switch'
   ; type=BOOLEAN,access=rw---,values=1
   : values=on
numid=34,iface=MIXER,name='Video Playback Volume'
   ; type=INTEGER,access=rw---,values=2,min=0,max=31,step=0
   : values=9,9

It seem that get_compare_weight() use pre-defined names to perform
matching


Takashi Iwai wrote:
> At Tue, 13 Sep 2005 23:22:14 +0800,
> Raymond wrote:
> 
>>Is it possible to rename "Video" to "MPU401" in enumerated "Capture 
>>Source" mixer control by the au88x0 driver ?
>>
>>numid=39,iface=MIXER,name='Capture Source'
>>   ; type=ENUMERATED,access=rw---,values=2,items=8
>>   ; Item #0 'Mic'
>>   ; Item #1 'CD'
>>   ; Item #2 'Video' <---------------MPU 401 / wavetable daugther card
>>   ; Item #3 'Aux'
>>   ; Item #4 'Line'
>>   ; Item #5 'Mix'
>>   ; Item #6 'Mix Mono'
>>   ; Item #7 'Phone'
>>   : values=0,0
> 
> 
> Currently, you need an ugly hack.
> 
> Find "Capture Source" control and replace the private_value field with
> the point to a new own struct ac97_enum.  For example,
> 
> /* taken from ac97/ac97_local.h */
> #define AC97_ENUM_DOUBLE(xreg, xshift_l, xshift_r, xmask, xtexts) \
> { .reg = xreg, .shift_l = xshift_l, .shift_r = xshift_r, \
>   .mask = xmask, .texts = xtexts }
> 
> static const char *my_own_sel[] = { "Mic", "CD", "WaveTable", "Aux",
> "line", Mix", "Mix Mono", "Phone" };
> 
> static const struct ac97_enum my_own_enum =
> AC97_ENUM_DOUBLE(AC97_REC_SEL, 8, 0, 8, my_own_sel);
> 
> 
> Then use snd_ctl_find_id() to get a snd_kcontrol_t object, and
> replace its private_value field with (unsigned long)&my_own_enum.
> 
> 
> Takashi
> 




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