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. 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.