snd_pcm_playback_data (9) Linux Manual Page
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.