[alsa-devel] [PATCH] Add support for gain in softvol plugin

[Steve Longerbeam]

Takashi Iwai wrote:
> At Thu, 10 May 2007 12:57:10 -0700,
> Steve Longerbeam wrote:
>   
>> Hi Takashi,
>>
>> Thanks, that's much better. I tried doing that myself a while ago, but I 
>> must have been doing something wrong because the capture device wasn't 
>> being recognized. But your version works.
>>
>> Version 4 of the patch is attached. It's much better, only two modified 
>> files: pcm_softvol.c and HDA-Intel.conf.
>>
>> I also reduced the gain range, it's now -30 to +30 dB.
>>     
>
> I'm afraid that this choice would be bad for the current TLV
> representation.  The default resolution is 256, so -30/30 dB range
> doesn't match to this resolution.  We should change either resolution
> (e.g. 120, corresponding to 0.5dB step), or the range.
>   

ok, that's no problem. How about we change the range to (in HDA-Intel.conf):

min_dB: -21.0
max_dB: 30.0

Steve
> Otherwise it looks fine to me.
>
>
> Thanks,
>
> Takashi
>
>