From: Clemens Ladisch <clemens@ladisch.de>
To: alsa-devel@alsa-project.org
Subject: Re: what is period_size, buffer_size and boundary size, i confuse them
Date: Sun, 09 Dec 2012 17:22:27 +0100 [thread overview]
Message-ID: <50C4BAC3.4030300@ladisch.de> (raw)
In-Reply-To: <65bdafa4.4e24.13b8019be47.Coremail.l9jj@163.com>
l9jj wrote:
> can anyone help me to figure out the concepts between period_size ,buffer_size and boundary size?
> n * period_size = buffer_size?
Yes. On many devices, n is not required to be an integer.
> m * buffer_size = boundary_size?
Yes, where m is very big. In applications, the actual value of the boundary
size does not matter (except as a special value for some sw params).
> and how the dma buffer mapped to the alsa buffer?
The DMA buffer _is_ the ALSA buffer.
Regards,
Clemens
next prev parent reply other threads:[~2012-12-09 16:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-09 14:37 what is period_size, buffer_size and boundary size, i confuse them l9jj
2012-12-09 16:22 ` Clemens Ladisch [this message]
-- strict thread matches above, loose matches on Subject: below --
2012-12-10 8:09 l9jj
2012-12-10 8:24 ` Clemens Ladisch
2012-12-10 9:19 l9jj
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=50C4BAC3.4030300@ladisch.de \
--to=clemens@ladisch.de \
--cc=alsa-devel@alsa-project.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.