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1 | .. -*- coding: utf-8; mode: rst -*- |
2 | ||
3 | .. _DMX_GET_STC: | |
4 | ||
586027ce | 5 | =========== |
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6 | DMX_GET_STC |
7 | =========== | |
8 | ||
15e7d615 | 9 | Name |
586027ce | 10 | ---- |
47d23e36 | 11 | |
586027ce | 12 | DMX_GET_STC |
47d23e36 | 13 | |
15e7d615 MCC |
14 | |
15 | Synopsis | |
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16 | -------- |
17 | ||
5929cb17 | 18 | .. cpp:function:: int ioctl( int fd, int request = DMX_GET_STC, struct dmx_stc *stc) |
47d23e36 | 19 | |
47d23e36 | 20 | |
15e7d615 | 21 | Arguments |
586027ce | 22 | --------- |
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23 | |
24 | .. flat-table:: | |
25 | :header-rows: 0 | |
26 | :stub-columns: 0 | |
27 | ||
28 | ||
29 | - .. row 1 | |
30 | ||
31 | - int fd | |
32 | ||
33 | - File descriptor returned by a previous call to open(). | |
34 | ||
35 | - .. row 2 | |
36 | ||
37 | - int request | |
38 | ||
39 | - Equals DMX_GET_STC for this command. | |
40 | ||
41 | - .. row 3 | |
42 | ||
43 | - struct dmx_stc \*stc | |
44 | ||
45 | - Pointer to the location where the stc is to be stored. | |
46 | ||
47 | ||
15e7d615 | 48 | Description |
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49 | ----------- |
50 | ||
51 | This ioctl call returns the current value of the system time counter | |
52 | (which is driven by a PES filter of type DMX_PES_PCR). Some hardware | |
53 | supports more than one STC, so you must specify which one by setting the | |
54 | num field of stc before the ioctl (range 0...n). The result is returned | |
55 | in form of a ratio with a 64 bit numerator and a 32 bit denominator, so | |
56 | the real 90kHz STC value is stc->stc / stc->base . | |
57 | ||
58 | ||
15e7d615 | 59 | Return Value |
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60 | ------------ |
61 | ||
62 | On success 0 is returned, on error -1 and the ``errno`` variable is set | |
63 | appropriately. The generic error codes are described at the | |
64 | :ref:`Generic Error Codes <gen-errors>` chapter. | |
65 | ||
66 | ||
67 | ||
68 | .. flat-table:: | |
69 | :header-rows: 0 | |
70 | :stub-columns: 0 | |
71 | ||
72 | ||
73 | - .. row 1 | |
74 | ||
75 | - ``EINVAL`` | |
76 | ||
77 | - Invalid stc number. |