From: Clemens Ladisch <clemens@ladisch.de>
To: alberto Villa <a.villa@seletech.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: Using MMAP feature
Date: Mon, 23 Jul 2012 12:38:27 +0200 [thread overview]
Message-ID: <500D29A3.50204@ladisch.de> (raw)
In-Reply-To: <500CF994.5090901@seletech.com>
alberto Villa wrote:> Hello,
> I'm going to use the MMAP feature of ALSA.
Why do you need to do this?
> snd_pcm_mmap_begin(capture, &c_area, &c_offset, &c_frames);
>
> it keeps to return c_frames = 0: is it right ? what does this mean?
It means that there are no samples available at the moment.
(Or that you forgot to call snd_pcm_avail_update(), or that you
didn't set c_frames before the call.)
Regards,
Clemens
next prev parent reply other threads:[~2012-07-23 10:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-23 7:13 Using MMAP feature alberto Villa
2012-07-23 10:38 ` Clemens Ladisch [this message]
[not found] ` <500D40D5.6050606@seletech.com>
2012-07-23 14:46 ` Clemens Ladisch
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