'\" te
.\"  Copyright (c) 2005, 4Front Technologies 2005\&.
.TH ossddk_dmap_get_buffused 9ossddk "12 Sep 2005" "SunOS 5.10" "OSS DDK Services"
.SH "NAME"
ossddk_dmap_get_buffused \- Returns the size of buffer that is actually in use
.PP
.SH "SYNOPSIS"
.nf
#include <sys/soundcard.h>
.LP
#include <sys/ossddk/ossddk.h>
.fi
.LP
\fBint\fR ossddk_dmap_get_buffused(\fBdmap_t *\fIdmap\fP);
.PP
.SH "INTERFACE LEVEL"
.PP
Open Sound System specific (OSS 4.0 DDK)\&.
.PP
.SH "ARGUMENTS"
.PP
.sp
.ne 2
.mk
\fB\fIdmap\fR
.in +16n
.rt
Audio buffer handle.
.in -16n
.PP
.SH "DESCRIPTION"
.PP
OSS audio devices have a DMA buffer with the maximum size returned by 
\fIossddk_dmap_get_buffsize\fR. However in most cases just part of the available
buffer is actually in use. The driver can call \fIossddk_dmap_get_buffused\fR
to find out the transfer count to be programmed in the device registers.
.PP
.SH "RETURN VALUES"
Amount of buffer currently in use (in bytes). This value equals to
fragment_size*num_fragments.
.PP
.SH "SEE ALSO"
.PP
\fIWriting Sound Device Drivers with OSS DDK\fR
.LP
\fIOpen Sound System Programmer's Guide\fR