diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/vidioc-dv-timings-cap.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/vidioc-dv-timings-cap.rst | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/Documentation/media/uapi/v4l/vidioc-dv-timings-cap.rst b/Documentation/media/uapi/v4l/vidioc-dv-timings-cap.rst new file mode 100644 index 000000000000..5a35bb254b4b --- /dev/null +++ b/Documentation/media/uapi/v4l/vidioc-dv-timings-cap.rst @@ -0,0 +1,250 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _VIDIOC_DV_TIMINGS_CAP: + +********************************************************* +ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP +********************************************************* + +Name +==== + +VIDIOC_DV_TIMINGS_CAP - VIDIOC_SUBDEV_DV_TIMINGS_CAP - The capabilities of the Digital Video receiver/transmitter + + +Synopsis +======== + +.. cpp:function:: int ioctl( int fd, int request, struct v4l2_dv_timings_cap *argp ) + + +Arguments +========= + +``fd`` + File descriptor returned by :ref:`open() <func-open>`. + +``request`` + VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP + +``argp`` + + +Description +=========== + +To query the capabilities of the DV receiver/transmitter applications +initialize the ``pad`` field to 0, zero the reserved array of struct +:ref:`v4l2_dv_timings_cap <v4l2-dv-timings-cap>` and call the +``VIDIOC_DV_TIMINGS_CAP`` ioctl on a video node and the driver will fill +in the structure. Note that drivers may return different values after +switching the video input or output. + +When implemented by the driver DV capabilities of subdevices can be +queried by calling the ``VIDIOC_SUBDEV_DV_TIMINGS_CAP`` ioctl directly +on a subdevice node. The capabilities are specific to inputs (for DV +receivers) or outputs (for DV transmitters), applications must specify +the desired pad number in the struct +:ref:`v4l2_dv_timings_cap <v4l2-dv-timings-cap>` ``pad`` field and +zero the ``reserved`` array. Attempts to query capabilities on a pad +that doesn't support them will return an ``EINVAL`` error code. + + +.. _v4l2-bt-timings-cap: + +.. flat-table:: struct v4l2_bt_timings_cap + :header-rows: 0 + :stub-columns: 0 + :widths: 1 1 2 + + + - .. row 1 + + - __u32 + + - ``min_width`` + + - Minimum width of the active video in pixels. + + - .. row 2 + + - __u32 + + - ``max_width`` + + - Maximum width of the active video in pixels. + + - .. row 3 + + - __u32 + + - ``min_height`` + + - Minimum height of the active video in lines. + + - .. row 4 + + - __u32 + + - ``max_height`` + + - Maximum height of the active video in lines. + + - .. row 5 + + - __u64 + + - ``min_pixelclock`` + + - Minimum pixelclock frequency in Hz. + + - .. row 6 + + - __u64 + + - ``max_pixelclock`` + + - Maximum pixelclock frequency in Hz. + + - .. row 7 + + - __u32 + + - ``standards`` + + - The video standard(s) supported by the hardware. See + :ref:`dv-bt-standards` for a list of standards. + + - .. row 8 + + - __u32 + + - ``capabilities`` + + - Several flags giving more information about the capabilities. See + :ref:`dv-bt-cap-capabilities` for a description of the flags. + + - .. row 9 + + - __u32 + + - ``reserved``\ [16] + + - Reserved for future extensions. Drivers must set the array to + zero. + + + +.. _v4l2-dv-timings-cap: + +.. flat-table:: struct v4l2_dv_timings_cap + :header-rows: 0 + :stub-columns: 0 + :widths: 1 1 2 1 + + + - .. row 1 + + - __u32 + + - ``type`` + + - Type of DV timings as listed in :ref:`dv-timing-types`. + + - .. row 2 + + - __u32 + + - ``pad`` + + - Pad number as reported by the media controller API. This field is + only used when operating on a subdevice node. When operating on a + video node applications must set this field to zero. + + - .. row 3 + + - __u32 + + - ``reserved``\ [2] + + - Reserved for future extensions. Drivers and applications must set + the array to zero. + + - .. row 4 + + - union + + - + - + + - .. row 5 + + - + - struct :ref:`v4l2_bt_timings_cap <v4l2-bt-timings-cap>` + + - ``bt`` + + - BT.656/1120 timings capabilities of the hardware. + + - .. row 6 + + - + - __u32 + + - ``raw_data``\ [32] + + - + + + +.. _dv-bt-cap-capabilities: + +.. flat-table:: DV BT Timing capabilities + :header-rows: 0 + :stub-columns: 0 + + + - .. row 1 + + - Flag + + - Description + + - .. row 2 + + - + - + + - .. row 3 + + - ``V4L2_DV_BT_CAP_INTERLACED`` + + - Interlaced formats are supported. + + - .. row 4 + + - ``V4L2_DV_BT_CAP_PROGRESSIVE`` + + - Progressive formats are supported. + + - .. row 5 + + - ``V4L2_DV_BT_CAP_REDUCED_BLANKING`` + + - CVT/GTF specific: the timings can make use of reduced blanking + (CVT) or the 'Secondary GTF' curve (GTF). + + - .. row 6 + + - ``V4L2_DV_BT_CAP_CUSTOM`` + + - Can support non-standard timings, i.e. timings not belonging to + the standards set in the ``standards`` field. + + +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. |