.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: DTV.dmx
.. _DMX_GET_STC:
===========
DMX_GET_STC
===========
Name
----
DMX_GET_STC
Synopsis
--------
.. c:macro:: DMX_GET_STC
``int ioctl(int fd, DMX_GET_STC, struct dmx_stc *stc)``
Arguments
---------
``fd``
File descriptor returned by :c:func:`open()`.
``stc``
Pointer to :c:type:`dmx_stc` where the stc data is to be stored.
Description
-----------
This ioctl call returns the current value of the system time counter
(which is driven by a PES filter of type :c:type:`DMX_PES_PCR <dmx_ts_pes>`).
Some hardware supports more than one STC, so you must specify which one by
setting the :c:type:`num <dmx_stc>` field of stc before the ioctl (range 0...n).
The result is returned in form of a ratio with a 64 bit numerator
and a 32 bit denominator, so the real 90kHz STC value is
``stc->stc / stc->base``.
Return Value
------------
On success 0 is returned.
On error -1 is returned, and the ``errno`` variable is set
appropriately.
.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
.. flat-table::
:header-rows: 0
:stub-columns: 0
:widths: 1 16
- .. row 1
- ``EINVAL``
- Invalid stc number.
The generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.
[ Dauer der Verarbeitung: 0.2 Sekunden
(vorverarbeitet)
]
