| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| |
| .. _VIDEO_SELECT_SOURCE: |
| |
| =================== |
| VIDEO_SELECT_SOURCE |
| =================== |
| |
| Name |
| ---- |
| |
| VIDEO_SELECT_SOURCE |
| |
| .. attention:: This ioctl is deprecated. |
| |
| Synopsis |
| -------- |
| |
| .. c:function:: int ioctl(fd, VIDEO_SELECT_SOURCE, video_stream_source_t source) |
| :name: VIDEO_SELECT_SOURCE |
| |
| |
| Arguments |
| --------- |
| |
| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
| |
| |
| - .. row 1 |
| |
| - int fd |
| |
| - File descriptor returned by a previous call to open(). |
| |
| - .. row 2 |
| |
| - int request |
| |
| - Equals VIDEO_SELECT_SOURCE for this command. |
| |
| - .. row 3 |
| |
| - video_stream_source_t source |
| |
| - Indicates which source shall be used for the Video stream. |
| |
| |
| Description |
| ----------- |
| |
| This ioctl is for Digital TV devices only. This ioctl was also supported by the |
| V4L2 ivtv driver, but that has been replaced by the ivtv-specific |
| ``IVTV_IOC_PASSTHROUGH_MODE`` ioctl. |
| |
| This ioctl call informs the video device which source shall be used for |
| the input data. The possible sources are demux or memory. If memory is |
| selected, the data is fed to the video device through the write command. |
| |
| .. c:type:: video_stream_source_t |
| |
| .. code-block:: c |
| |
| typedef enum { |
| VIDEO_SOURCE_DEMUX, /* Select the demux as the main source */ |
| VIDEO_SOURCE_MEMORY /* If this source is selected, the stream |
| comes from the user through the write |
| system call */ |
| } video_stream_source_t; |
| |
| Return Value |
| ------------ |
| |
| On success 0 is returned, on error -1 and the ``errno`` variable is set |
| appropriately. The generic error codes are described at the |
| :ref:`Generic Error Codes <gen-errors>` chapter. |
