[alsa-devel] [RFC PATCH 2/3] ALSA:core: Add rate 24kHz

[Pierre-Louis Bossart]

>>>> Adds SNDRV_PCM_RATE_24000 at the bottom to keep backward compability
>>>> with alsa library.
>>>>
>>>> Signed-off-by: Pawel Harlozinski <pawel.harlozinski at linux.intel.com>
>>>
>>> No.  Such a fancy rate has to be handled inside the driver locally
>>> instead of adding to the common rate.
>>
>> It's not that crazy, this is supported in the HDaudio spec:
>>
>> Sample Base Rate Divisor (DIV):
>> 000 = Divide by 1 (48 kHz, 44.1 kHz)
>> 001 = Divide by 2 (24 kHz, 22.05 kHz)
>>
>> I am not sure why 22.05 made the cut and not 24 kHz, they are both
>> derived from common clocks with the same divider... Same for 11.025
>> and 12...
> 
> I'm not against supporting it.  It'd be fine if it were the changes
> that are applied only to HD-audio driver side.  What I'm against is to
> change the ALSA PCM core.  It's not necessarily done there at all.

Humm, out of curiosity what is the issue here? Would this addition break 
anything? I don't personally care too much but I've never quite 
understood why the ALSA core only defined a subset of 'common' rates.