1 .. SPDX-License-Identifier: GFDL-1.1-no-invari 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2 .. c:namespace:: V4L 2 .. c:namespace:: V4L
3 3
4 .. _VIDIOC_DV_TIMINGS_CAP: 4 .. _VIDIOC_DV_TIMINGS_CAP:
5 5
6 ********************************************** 6 *********************************************************
7 ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_ 7 ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP
8 ********************************************** 8 *********************************************************
9 9
10 Name 10 Name
11 ==== 11 ====
12 12
13 VIDIOC_DV_TIMINGS_CAP - VIDIOC_SUBDEV_DV_TIMIN 13 VIDIOC_DV_TIMINGS_CAP - VIDIOC_SUBDEV_DV_TIMINGS_CAP - The capabilities of the Digital Video receiver/transmitter
14 14
15 Synopsis 15 Synopsis
16 ======== 16 ========
17 17
18 .. c:macro:: VIDIOC_DV_TIMINGS_CAP 18 .. c:macro:: VIDIOC_DV_TIMINGS_CAP
19 19
20 ``int ioctl(int fd, VIDIOC_DV_TIMINGS_CAP, str 20 ``int ioctl(int fd, VIDIOC_DV_TIMINGS_CAP, struct v4l2_dv_timings_cap *argp)``
21 21
22 .. c:macro:: VIDIOC_SUBDEV_DV_TIMINGS_CAP 22 .. c:macro:: VIDIOC_SUBDEV_DV_TIMINGS_CAP
23 23
24 ``int ioctl(int fd, VIDIOC_SUBDEV_DV_TIMINGS_C 24 ``int ioctl(int fd, VIDIOC_SUBDEV_DV_TIMINGS_CAP, struct v4l2_dv_timings_cap *argp)``
25 25
26 Arguments 26 Arguments
27 ========= 27 =========
28 28
29 ``fd`` 29 ``fd``
30 File descriptor returned by :c:func:`open( 30 File descriptor returned by :c:func:`open()`.
31 31
32 ``argp`` 32 ``argp``
33 Pointer to struct :c:type:`v4l2_dv_timings 33 Pointer to struct :c:type:`v4l2_dv_timings_cap`.
34 34
35 Description 35 Description
36 =========== 36 ===========
37 37
38 To query the capabilities of the DV receiver/t 38 To query the capabilities of the DV receiver/transmitter applications
39 initialize the ``pad`` field to 0, zero the re 39 initialize the ``pad`` field to 0, zero the reserved array of struct
40 :c:type:`v4l2_dv_timings_cap` and call the 40 :c:type:`v4l2_dv_timings_cap` and call the
41 ``VIDIOC_DV_TIMINGS_CAP`` ioctl on a video nod 41 ``VIDIOC_DV_TIMINGS_CAP`` ioctl on a video node and the driver will fill
42 in the structure. 42 in the structure.
43 43
44 .. note:: 44 .. note::
45 45
46 Drivers may return different values after 46 Drivers may return different values after
47 switching the video input or output. 47 switching the video input or output.
48 48
49 When implemented by the driver DV capabilities 49 When implemented by the driver DV capabilities of subdevices can be
50 queried by calling the ``VIDIOC_SUBDEV_DV_TIMI 50 queried by calling the ``VIDIOC_SUBDEV_DV_TIMINGS_CAP`` ioctl directly
51 on a subdevice node. The capabilities are spec 51 on a subdevice node. The capabilities are specific to inputs (for DV
52 receivers) or outputs (for DV transmitters), a 52 receivers) or outputs (for DV transmitters), applications must specify
53 the desired pad number in the struct 53 the desired pad number in the struct
54 :c:type:`v4l2_dv_timings_cap` ``pad`` field an 54 :c:type:`v4l2_dv_timings_cap` ``pad`` field and
55 zero the ``reserved`` array. Attempts to query 55 zero the ``reserved`` array. Attempts to query capabilities on a pad
56 that doesn't support them will return an ``EIN 56 that doesn't support them will return an ``EINVAL`` error code.
57 57
58 .. tabularcolumns:: |p{1.2cm}|p{3.2cm}|p{12.9c 58 .. tabularcolumns:: |p{1.2cm}|p{3.2cm}|p{12.9cm}|
59 59
60 .. c:type:: v4l2_bt_timings_cap 60 .. c:type:: v4l2_bt_timings_cap
61 61
62 .. flat-table:: struct v4l2_bt_timings_cap 62 .. flat-table:: struct v4l2_bt_timings_cap
63 :header-rows: 0 63 :header-rows: 0
64 :stub-columns: 0 64 :stub-columns: 0
65 :widths: 1 1 2 65 :widths: 1 1 2
66 66
67 * - __u32 67 * - __u32
68 - ``min_width`` 68 - ``min_width``
69 - Minimum width of the active video in p 69 - Minimum width of the active video in pixels.
70 * - __u32 70 * - __u32
71 - ``max_width`` 71 - ``max_width``
72 - Maximum width of the active video in p 72 - Maximum width of the active video in pixels.
73 * - __u32 73 * - __u32
74 - ``min_height`` 74 - ``min_height``
75 - Minimum height of the active video in 75 - Minimum height of the active video in lines.
76 * - __u32 76 * - __u32
77 - ``max_height`` 77 - ``max_height``
78 - Maximum height of the active video in 78 - Maximum height of the active video in lines.
79 * - __u64 79 * - __u64
80 - ``min_pixelclock`` 80 - ``min_pixelclock``
81 - Minimum pixelclock frequency in Hz. 81 - Minimum pixelclock frequency in Hz.
82 * - __u64 82 * - __u64
83 - ``max_pixelclock`` 83 - ``max_pixelclock``
84 - Maximum pixelclock frequency in Hz. 84 - Maximum pixelclock frequency in Hz.
85 * - __u32 85 * - __u32
86 - ``standards`` 86 - ``standards``
87 - The video standard(s) supported by the 87 - The video standard(s) supported by the hardware. See
88 :ref:`dv-bt-standards` for a list of s 88 :ref:`dv-bt-standards` for a list of standards.
89 * - __u32 89 * - __u32
90 - ``capabilities`` 90 - ``capabilities``
91 - Several flags giving more information 91 - Several flags giving more information about the capabilities. See
92 :ref:`dv-bt-cap-capabilities` for a de 92 :ref:`dv-bt-cap-capabilities` for a description of the flags.
93 * - __u32 93 * - __u32
94 - ``reserved``\ [16] 94 - ``reserved``\ [16]
95 - Reserved for future extensions. 95 - Reserved for future extensions.
96 Drivers must set the array to zero. 96 Drivers must set the array to zero.
97 97
98 98
99 .. tabularcolumns:: |p{4.4cm}|p{3.6cm}|p{9.3cm 99 .. tabularcolumns:: |p{4.4cm}|p{3.6cm}|p{9.3cm}|
100 100
101 .. c:type:: v4l2_dv_timings_cap 101 .. c:type:: v4l2_dv_timings_cap
102 102
103 .. flat-table:: struct v4l2_dv_timings_cap 103 .. flat-table:: struct v4l2_dv_timings_cap
104 :header-rows: 0 104 :header-rows: 0
105 :stub-columns: 0 105 :stub-columns: 0
106 :widths: 1 1 2 106 :widths: 1 1 2
107 107
108 * - __u32 108 * - __u32
109 - ``type`` 109 - ``type``
110 - Type of DV timings as listed in :ref:` 110 - Type of DV timings as listed in :ref:`dv-timing-types`.
111 * - __u32 111 * - __u32
112 - ``pad`` 112 - ``pad``
113 - Pad number as reported by the media co 113 - Pad number as reported by the media controller API. This field is
114 only used when operating on a subdevic 114 only used when operating on a subdevice node. When operating on a
115 video node applications must set this 115 video node applications must set this field to zero.
116 * - __u32 116 * - __u32
117 - ``reserved``\ [2] 117 - ``reserved``\ [2]
118 - Reserved for future extensions. 118 - Reserved for future extensions.
119 119
120 Drivers and applications must set the 120 Drivers and applications must set the array to zero.
121 * - union { 121 * - union {
122 - (anonymous) 122 - (anonymous)
123 * - struct :c:type:`v4l2_bt_timings_cap` 123 * - struct :c:type:`v4l2_bt_timings_cap`
124 - ``bt`` 124 - ``bt``
125 - BT.656/1120 timings capabilities of th 125 - BT.656/1120 timings capabilities of the hardware.
126 * - __u32 126 * - __u32
127 - ``raw_data``\ [32] 127 - ``raw_data``\ [32]
128 * - } 128 * - }
129 - 129 -
130 130
131 .. tabularcolumns:: |p{7.2cm}|p{10.3cm}| 131 .. tabularcolumns:: |p{7.2cm}|p{10.3cm}|
132 132
133 .. _dv-bt-cap-capabilities: 133 .. _dv-bt-cap-capabilities:
134 134
135 .. flat-table:: DV BT Timing capabilities 135 .. flat-table:: DV BT Timing capabilities
136 :header-rows: 0 136 :header-rows: 0
137 :stub-columns: 0 137 :stub-columns: 0
138 138
139 * - Flag 139 * - Flag
140 - Description 140 - Description
141 * - 141 * -
142 - 142 -
143 * - ``V4L2_DV_BT_CAP_INTERLACED`` 143 * - ``V4L2_DV_BT_CAP_INTERLACED``
144 - Interlaced formats are supported. 144 - Interlaced formats are supported.
145 * - ``V4L2_DV_BT_CAP_PROGRESSIVE`` 145 * - ``V4L2_DV_BT_CAP_PROGRESSIVE``
146 - Progressive formats are supported. 146 - Progressive formats are supported.
147 * - ``V4L2_DV_BT_CAP_REDUCED_BLANKING`` 147 * - ``V4L2_DV_BT_CAP_REDUCED_BLANKING``
148 - CVT/GTF specific: the timings can make 148 - CVT/GTF specific: the timings can make use of reduced blanking
149 (CVT) or the 'Secondary GTF' curve (GT 149 (CVT) or the 'Secondary GTF' curve (GTF).
150 * - ``V4L2_DV_BT_CAP_CUSTOM`` 150 * - ``V4L2_DV_BT_CAP_CUSTOM``
151 - Can support non-standard timings, i.e. 151 - Can support non-standard timings, i.e. timings not belonging to
152 the standards set in the ``standards`` 152 the standards set in the ``standards`` field.
153 153
154 Return Value 154 Return Value
155 ============ 155 ============
156 156
157 On success 0 is returned, on error -1 and the 157 On success 0 is returned, on error -1 and the ``errno`` variable is set
158 appropriately. The generic error codes are des 158 appropriately. The generic error codes are described at the
159 :ref:`Generic Error Codes <gen-errors>` chapte 159 :ref:`Generic Error Codes <gen-errors>` chapter.
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