From: Clemens Ladisch <clemens@ladisch.de>
To: Jon Smirl <jonsmirl@gmail.com>
Cc: ALSA-devel <alsa-devel@alsa-project.org>
Subject: Re: ASOC PCM formats
Date: Mon, 09 Jun 2008 09:20:25 +0200 [thread overview]
Message-ID: <484CD9B9.8000208@ladisch.de> (raw)
In-Reply-To: <9e4733910806061700r6650ded8j7c7680e4774d327d@mail.gmail.com>
Jon Smirl wrote:
> Why is the AC97 format set to S16 in all of the drivers? The link is
> 20b and my codec takes 20b, how do I get 20b data to the device?
You can only use sample formats that are supported by the AC97
controller.
> I tried using SNDRV_PCM_FORMAT_S20_3BE but all I get is static.
S20_3LE could in theory be used by USB devices. There is no hardware
that supports S20_3BE.
How did you use this format? Which driver is this?
> If I use S24 for the format it works but volume is divided by 16.
S24 means that the 24 sample bits are in the least significant bits of
a 32-bit memory word. 24 sample bits in the most significant bits of
a 32-bit memory word would be S32. (It might be possible that your
driver gets this wrong.)
Regards,
Clemens
next prev parent reply other threads:[~2008-06-09 7:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-07 0:00 ASOC PCM formats Jon Smirl
2008-06-09 7:20 ` Clemens Ladisch [this message]
2008-06-09 9:17 ` Mark Brown
2008-06-09 13:08 ` Jon Smirl
2008-06-09 16:42 ` Mark Brown
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