From: Alan Young <Alan.Young@IEE.org>
To: alsa-devel@alsa-project.org
Subject: Difference between boundary and buffer_size
Date: Thu, 3 Nov 2016 09:11:04 +0000 [thread overview]
Message-ID: <581AFF28.5060500@IEE.org> (raw)
The code in the kernel, in /pcm_lib.c/ and /pcm_native.c/, uses fields
buffer_size and boundary in struct snd_pcm_runtime. As far as I can see,
there are always initialized to the same value. In what circumstance
might they be different? There is clearly some relationship to
hw_ptr_base, as illustrated by this repeated snipped from
snd_pcm_update_hw_ptr0()
hw_base += runtime->buffer_size;
if (hw_base >= runtime->boundary) {
hw_base = 0;
crossed_boundary++;
}
new_hw_ptr = hw_base + pos;
Alan.
next reply other threads:[~2016-11-03 9:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-03 9:11 Alan Young [this message]
2016-11-03 16:45 ` Difference between boundary and buffer_size Lars-Peter Clausen
2016-11-03 22:56 ` Lars-Peter Clausen
2016-11-03 20:01 ` Clemens Ladisch
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