From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nilhcraiv <nilhcraiv@gmail.com>
Subject: Re: Playback - Overwrite buffer with silence
Date: Mon, 13 Apr 2015 16:45:23 +0200
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To: Clemens Ladisch <clemens@ladisch.de>, alsa-devel@alsa-project.org
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Clemens wrote:
    It is impossible for the boundar to be zero.

In my code snd_pcm_sw_params_get_boundary(swparams, &boundary) function 
does not return a negative value and the boundary variable is set to zero 
then, the boundar is zero.

In any case, How I can put silence in buffer to avoid underrun? Do you know 
the answer?

Thank you in advance.