linux-kernel - PCM format support (24 bit data stored in 32-bit word) in ALSA?

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Message-ID: <c058f1520806232346q5c963083x214b658e85523d95@mail.gmail.com>
Date:	Mon, 23 Jun 2008 23:46:11 -0700
From:	"X Jin" <jinx080808@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: PCM format support (24 bit data stored in 32-bit word) in ALSA?

Hi,

I have a capture card using a TI PCM1803a chip, which is a 24-bit AD
converter. However a 24-bit digital information is stored in a 32-bit
word. I searched the ALSA PCM code and found that the format
SNDRV_PCM_FORMAT_S24_LE (and others) defines the physical bit width as
32. I guess these definitions are designed to handle exactly the
situation I'm facing now. In other words, ALSA can handle the 24-bit
format in a 32-bit physical data.

Is my understanding correct?

TIA
-XJ
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