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NAME

       snd_pcm_playback_data  -  check whether any data exists on the playback
       buffer

SYNOPSIS

       int snd_pcm_playback_data  (snd_pcm_substream_t * substream);

ARGUMENTS

       substream
              the pcm substream instance

DESCRIPTION

       Checks  whether  any  data  exists   on   the   playback   buffer.   If
       stop_threshold  is  bigger  or  equal  to  boundary, then this function
       returns always non-zero.

       Returns non-zero if exists, or zero if not.