From mboxrd@z Thu Jan  1 00:00:00 1970
From: Irfan shaikh <irfan.shaikh@sasken.com>
Subject: ALSA Underrun / Silence playback
Date: Mon, 5 Dec 2011 12:10:10 +0530
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Hello devel,

          I am trying to implement s/w params for ALSA playback device 
such that there is SILENCE playback for UNDERRUN (-32).
          To achieve above i used below s/w params API's. But still i 
observe UNDERRUN in my AUDIO Playback.
          Please correct me if i am mising somenting.
{When i do get boundry, i get some weird value 1572864000. Thus i tried 
to use alsa buffer size for threshold}

/*************************************************************************************/ 

   if (snd_pcm_sw_params_get_boundary (alsaParams->p_swparams, 
&boundary) < 0)
         {
                 printf ("Could not gete snd_pcm_sw_params_get_boundary");
                 return NULL;
         }

//      threshold = boundary;
         threshold = alsaParams->periodsize * alsaParams->no_of_periods;

         if (snd_pcm_sw_params_set_stop_threshold 
(alsaParams->pcm_handle, alsaParams->p_swparams, threshold) < 0)
         {
                 printf("Could not gete snd_pcm_sw_params_get_boundary");
                 return NULL;
         }

         if (snd_pcm_sw_params_set_silence_threshold 
(alsaParams->pcm_handle, alsaParams->p_swparams, 0) < 0 ||
                         snd_pcm_sw_params_set_silence_size 
(alsaParams->pcm_handle, alsaParams->p_swparams, boundary) < 0)      /* 
play silence on XRUN */
         {
                 printf("Could not set silence params");
                 return NULL;
         }
/*************************************************************************************/

Thanks in advance !!

Regards,