1.. Permission is granted to copy, distribute and/or modify this 2.. document under the terms of the GNU Free Documentation License, 3.. Version 1.1 or any later version published by the Free Software 4.. Foundation, with no Invariant Sections, no Front-Cover Texts 5.. and no Back-Cover Texts. A copy of the license is included at 6.. Documentation/userspace-api/media/fdl-appendix.rst. 7.. 8.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections 9 10.. _DMX_GET_STC: 11 12=========== 13DMX_GET_STC 14=========== 15 16Name 17---- 18 19DMX_GET_STC 20 21 22Synopsis 23-------- 24 25.. c:function:: int ioctl( int fd, DMX_GET_STC, struct dmx_stc *stc) 26 :name: DMX_GET_STC 27 28Arguments 29--------- 30 31``fd`` 32 File descriptor returned by :c:func:`open() <dvb-dmx-open>`. 33 34``stc`` 35 Pointer to :c:type:`dmx_stc` where the stc data is to be stored. 36 37 38Description 39----------- 40 41This ioctl call returns the current value of the system time counter 42(which is driven by a PES filter of type :c:type:`DMX_PES_PCR <dmx_ts_pes>`). 43Some hardware supports more than one STC, so you must specify which one by 44setting the :c:type:`num <dmx_stc>` field of stc before the ioctl (range 0...n). 45The result is returned in form of a ratio with a 64 bit numerator 46and a 32 bit denominator, so the real 90kHz STC value is 47``stc->stc / stc->base``. 48 49 50Return Value 51------------ 52 53On success 0 is returned. 54 55On error -1 is returned, and the ``errno`` variable is set 56appropriately. 57 58.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| 59 60.. flat-table:: 61 :header-rows: 0 62 :stub-columns: 0 63 :widths: 1 16 64 65 - .. row 1 66 67 - ``EINVAL`` 68 69 - Invalid stc number. 70 71 72The generic error codes are described at the 73:ref:`Generic Error Codes <gen-errors>` chapter. 74