'\" t .\" Title: snd_pcm_playback_data .\" Author: [FIXME: author] [see http://docbook.sf.net/el/author] .\" Generator: DocBook XSL Stylesheets v1.79.1 .\" Date: January 2017 .\" Manual: PCM API .\" Source: Kernel Hackers Manual 4.8.15 .\" Language: English .\" .TH "SND_PCM_PLAYBACK_DAT" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "PCM API" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" snd_pcm_playback_data \- check whether any data exists on the playback buffer .SH "SYNOPSIS" .HP \w'int\ snd_pcm_playback_data('u .BI "int snd_pcm_playback_data(struct\ snd_pcm_substream\ *\ " "substream" ");" .SH "ARGUMENTS" .PP \fIsubstream\fR .RS 4 the pcm substream instance .RE .SH "DESCRIPTION" .PP Checks whether any data exists on the playback buffer\&. .SH "RETURN" .PP 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\&. .SH "COPYRIGHT" .br