summaryrefslogtreecommitdiff
path: root/Documentation/media/uapi/v4l/vidioc-dv-timings-cap.rst
blob: e14e780eb0d1e1c519b355bbeb52b72c8bf538a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
.. -*- 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::

   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:

.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|

.. 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:

.. tabularcolumns:: |p{3.5cm}|p{3.5cm}|p{7.0cm}|p{3.5cm}|

.. 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.