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From: Clemens Ladisch <clemens@ladisch.de>
To: Zhang wei <zhangwei@vimicro.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: what is the difference between SNDRV_PCM_FMTBIT_S24_LE and SNDRV_PCM_FMTBIT_S24_3LE
Date: Thu, 11 Apr 2013 11:00:44 +0200	[thread overview]
Message-ID: <51667BBC.3070609@ladisch.de> (raw)
In-Reply-To: <6B947C8AC4195040A8C6876A496C644A082F1EB2@BJ-MAIL-04.vimicro.com>

Zhang wei wrote:
> SNDRV_PCM_FORMAT_S24_3LE and SNDRV_PCM_FORMAT_S24_LE.
>
> What is the difference between them?

SNDRV_PCM_FORMAT_S24_3LE stores the 24 in three bytes, and is used only
for USB.

SNDRV_PCM_FORMAT_S24_LE stores the 24 bits in the lower bits of a 32-bit
word, and is almost never used.

Most devices that support 24 bits use SNDRV_PCM_FORMAT_S32_LE, which
stores the sample's bits in the upper bits of a 32-bit word.


Regards,
Clemens

  reply	other threads:[~2013-04-11  9:00 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-11  8:55 what is the difference between SNDRV_PCM_FMTBIT_S24_LE and SNDRV_PCM_FMTBIT_S24_3LE Zhang wei
2013-04-11  9:00 ` Clemens Ladisch [this message]
     [not found]   ` <6B947C8AC4195040A8C6876A496C644A082F1EEE@BJ-MAIL-04.vimicro.com>
2013-04-11  9:35     ` Clemens Ladisch
2013-04-11 15:27       ` Gabriel M. Beddingfield
2013-04-30 13:24         ` Mark Brown

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