SND_PCM_PLAYBACK_DAT(9)                      PCM API                      SND_PCM_PLAYBACK_DAT(9)



NAME
       snd_pcm_playback_data - check whether any data exists on the playback buffer

SYNOPSIS
       int snd_pcm_playback_data(struct snd_pcm_substream * substream);

ARGUMENTS
       substream
           the pcm substream instance

DESCRIPTION
       Checks whether any data exists on the playback buffer.

RETURN
       Non-zero if any data exists, or zero if not. If stop_threshold is bigger or equal to
       boundary, then this function returns always non-zero.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   SND_PCM_PLAYBACK_DAT(9)