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Diffstat (limited to 'misc/man9ossddk/ossddk_dmap_get_qhead.9ossddk')
| -rw-r--r-- | misc/man9ossddk/ossddk_dmap_get_qhead.9ossddk | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/misc/man9ossddk/ossddk_dmap_get_qhead.9ossddk b/misc/man9ossddk/ossddk_dmap_get_qhead.9ossddk new file mode 100644 index 0000000..93a8271 --- /dev/null +++ b/misc/man9ossddk/ossddk_dmap_get_qhead.9ossddk @@ -0,0 +1,50 @@ +'\" te +.\" Copyright (c) 2005, 4Front Technologies 2005\&. +.TH ossddk_dmap_get_qhead 9ossddk "12 Sep 2005" "SunOS 5.10" "OSS DDK Services" +.SH "NAME" +ossddk_dmap_get_qhead, ossddk_dmap_get_qtail \- Return the DMA buffer head/tail fragment numbers. +.PP +.SH "SYNOPSIS" +.nf +#include <sys/soundcard.h> +.LP +#include <sys/ossddk/ossddk.h> +.fi +.LP +\fBint\fR ossddk_dmap_get_qhead(\fBdmap_t *\fIdmap\fP); +\fBint\fR ossddk_dmap_get_qtail(\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 +Some drivers need to know which fragment it should copy to/from the device. +The \fIossddk_dmap_get_qhead\fR function can be used to get the current +fragment number during playback. The \fIossddk_dmap_get_qtail\fR function +returns the current fragment the device is expected to fill in next during +recording. The fragment number will be in range 0 to num_fragments-1. +.PP +Pointer to the current fragment can be computed using formula +\fptr =d mabuf_address + Ifragment_number*fragment_size\fR. +.PP +.SH "RETURN VALUES" +These functions return the current fragment number. +.PP +.SH "SEE ALSO" +.PP +\fIWriting Sound Device Drivers with OSS DDK\fR +.LP +\fIOpen Sound System Programmer's Guide\fR |