From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Alexander E. Patrakov" <patrakov@ums.usu.ru>
Subject: Re: Sample format coversion bug?
Date: Mon, 29 Oct 2007 16:01:12 +0500
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References: <4721E932.5090603@ums.usu.ru> <s5hpryyny19.wl%tiwai@suse.de>
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To: Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org
List-Id: alsa-devel@alsa-project.org

Takashi Iwai wrote:
> Well, apparently something wrong with mmap, then.

Do you mean "something is wrong with the kernel driver" or "plug really 
expects mmap access to the card to be available"?

>   Does the device really support 24bit format?

No, it doesn't - that's the whole point of the test. I expected "plug" 
to guess that the device supports a 16-bit format, record 16-bit samples 
from the hardware, multiply all recorded samples by 256, and return the 
result as 32-bit words (so that the result is a set of valid S24_LE 
samples, even though the least significant byte is always zero).

>   S24_LE isn't 3bytes format but packed
> into the lower 3 bytes in 4 byte frames.
>   

Yes, I know.

-- 
Alexander E. Patrakov