[alsa-devel] Maximum 50 dB gain in ALSA softvol plugin

[Takashi Iwai]

On Fri, 12 Jan 2018 17:02:03 +0100,
Ricard Wanderlof wrote:
> 
> 
> Hi,
> 
> The ALSA softvol plugin has a maximum gain of 50 dB (MAX_DB_UPPER_LIMIT is 
> fixed to 50 in pcm/pcm_softvol.c). Is there some technical reason for this 
> limit? These days when >16 bit audio is becoming common, it's not 
> unreasonable to have large gain figures, and that is in fact a usecase I 
> have right now.
> 
> I'm looking through the CONVERT_AREA and MULTI_DIV_foo macros to see if 
> there's something there that degenerates when the gain factor becomes too 
> large, but I'd thought I'd ask too rather than just do reverse 
> engineering.

There is no more reason than "some reasonable limit".


Takashi