1SND_PCM_PLAYBACK_DAT(9)          Sound Devices         SND_PCM_PLAYBACK_DAT(9)
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NAME

6       snd_pcm_playback_data - check whether any data exists on the playback
7       buffer
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SYNOPSIS

10       int snd_pcm_playback_data(struct snd_pcm_substream * substream);
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ARGUMENTS

13       substream
14           the pcm substream instance
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DESCRIPTION

17       Checks whether any data exists on the playback buffer.
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RETURN

20       Non-zero if any data exists, or zero if not. If stop_threshold is
21       bigger or equal to boundary, then this function returns always
22       non-zero.
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25Kernel Hackers Manual 3.10         June 2019           SND_PCM_PLAYBACK_DAT(9)
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