projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 47d23e36 MCC |
1 | .. -*- coding: utf-8; mode: rst -*- |
| 2 | ||
| 3 | .. _DMX_GET_STC: | |
| 4 | ||
| 586027ce | 5 | =========== |
| 47d23e36 MCC |
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 | |
| 47d23e36 MCC |
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 | --------- |
| 47d23e36 MCC |
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. |