snd_pcm_playback_data
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## 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.

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