| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 |
- .. 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.
|
