1 .. SPDX-License-Identifier: GFDL-1.1-no-invari !! 1 .. Permission is granted to copy, distribute and/or modify this
2 .. c:namespace:: V4L !! 2 .. document under the terms of the GNU Free Documentation License,
>> 3 .. Version 1.1 or any later version published by the Free Software
>> 4 .. Foundation, with no Invariant Sections, no Front-Cover Texts
>> 5 .. and no Back-Cover Texts. A copy of the license is included at
>> 6 .. Documentation/userspace-api/media/fdl-appendix.rst.
>> 7 ..
>> 8 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
3 9
4 .. _VIDIOC_G_DV_TIMINGS: 10 .. _VIDIOC_G_DV_TIMINGS:
5 11
6 ********************************************** 12 **********************************************
7 ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS 13 ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS
8 ********************************************** 14 **********************************************
9 15
10 Name 16 Name
11 ==== 17 ====
12 18
13 VIDIOC_G_DV_TIMINGS - VIDIOC_S_DV_TIMINGS - VI 19 VIDIOC_G_DV_TIMINGS - VIDIOC_S_DV_TIMINGS - VIDIOC_SUBDEV_G_DV_TIMINGS - VIDIOC_SUBDEV_S_DV_TIMINGS - Get or set DV timings for input or output
14 20
>> 21
15 Synopsis 22 Synopsis
16 ======== 23 ========
17 24
18 .. c:macro:: VIDIOC_G_DV_TIMINGS !! 25 .. c:function:: int ioctl( int fd, VIDIOC_G_DV_TIMINGS, struct v4l2_dv_timings *argp )
19 !! 26 :name: VIDIOC_G_DV_TIMINGS
20 ``int ioctl(int fd, VIDIOC_G_DV_TIMINGS, struc <<
21 <<
22 .. c:macro:: VIDIOC_S_DV_TIMINGS <<
23 27
24 ``int ioctl(int fd, VIDIOC_S_DV_TIMINGS, struc !! 28 .. c:function:: int ioctl( int fd, VIDIOC_S_DV_TIMINGS, struct v4l2_dv_timings *argp )
>> 29 :name: VIDIOC_S_DV_TIMINGS
25 30
26 .. c:macro:: VIDIOC_SUBDEV_G_DV_TIMINGS !! 31 .. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_G_DV_TIMINGS, struct v4l2_dv_timings *argp )
>> 32 :name: VIDIOC_SUBDEV_G_DV_TIMINGS
27 33
28 ``int ioctl(int fd, VIDIOC_SUBDEV_G_DV_TIMINGS !! 34 .. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_S_DV_TIMINGS, struct v4l2_dv_timings *argp )
>> 35 :name: VIDIOC_SUBDEV_S_DV_TIMINGS
29 36
30 .. c:macro:: VIDIOC_SUBDEV_S_DV_TIMINGS <<
31 <<
32 ``int ioctl(int fd, VIDIOC_SUBDEV_S_DV_TIMINGS <<
33 37
34 Arguments 38 Arguments
35 ========= 39 =========
36 40
37 ``fd`` 41 ``fd``
38 File descriptor returned by :c:func:`open( !! 42 File descriptor returned by :ref:`open() <func-open>`.
39 43
40 ``argp`` 44 ``argp``
41 Pointer to struct :c:type:`v4l2_dv_timings 45 Pointer to struct :c:type:`v4l2_dv_timings`.
42 46
>> 47
43 Description 48 Description
44 =========== 49 ===========
45 50
46 To set DV timings for the input or output, app 51 To set DV timings for the input or output, applications use the
47 :ref:`VIDIOC_S_DV_TIMINGS <VIDIOC_G_DV_TIMINGS 52 :ref:`VIDIOC_S_DV_TIMINGS <VIDIOC_G_DV_TIMINGS>` ioctl and to get the current timings,
48 applications use the :ref:`VIDIOC_G_DV_TIMINGS 53 applications use the :ref:`VIDIOC_G_DV_TIMINGS <VIDIOC_G_DV_TIMINGS>` ioctl. The detailed timing
49 information is filled in using the structure s 54 information is filled in using the structure struct
50 :c:type:`v4l2_dv_timings`. These ioctls take a 55 :c:type:`v4l2_dv_timings`. These ioctls take a
51 pointer to the struct :c:type:`v4l2_dv_timings 56 pointer to the struct :c:type:`v4l2_dv_timings`
52 structure as argument. If the ioctl is not sup 57 structure as argument. If the ioctl is not supported or the timing
53 values are not correct, the driver returns ``E 58 values are not correct, the driver returns ``EINVAL`` error code.
54 59
55 Calling ``VIDIOC_SUBDEV_S_DV_TIMINGS`` on a su 60 Calling ``VIDIOC_SUBDEV_S_DV_TIMINGS`` on a subdev device node that has been
56 registered in read-only mode is not allowed. A 61 registered in read-only mode is not allowed. An error is returned and the errno
57 variable is set to ``-EPERM``. 62 variable is set to ``-EPERM``.
58 63
59 The ``linux/v4l2-dv-timings.h`` header can be 64 The ``linux/v4l2-dv-timings.h`` header can be used to get the timings of
60 the formats in the :ref:`cea861` and :ref:`ves 65 the formats in the :ref:`cea861` and :ref:`vesadmt` standards. If
61 the current input or output does not support D 66 the current input or output does not support DV timings (e.g. if
62 :ref:`VIDIOC_ENUMINPUT` does not set the 67 :ref:`VIDIOC_ENUMINPUT` does not set the
63 ``V4L2_IN_CAP_DV_TIMINGS`` flag), then ``ENODA 68 ``V4L2_IN_CAP_DV_TIMINGS`` flag), then ``ENODATA`` error code is returned.
64 69
>> 70
65 Return Value 71 Return Value
66 ============ 72 ============
67 73
68 On success 0 is returned, on error -1 and the 74 On success 0 is returned, on error -1 and the ``errno`` variable is set
69 appropriately. The generic error codes are des 75 appropriately. The generic error codes are described at the
70 :ref:`Generic Error Codes <gen-errors>` chapte 76 :ref:`Generic Error Codes <gen-errors>` chapter.
71 77
72 EINVAL 78 EINVAL
73 This ioctl is not supported, or the :ref:` 79 This ioctl is not supported, or the :ref:`VIDIOC_S_DV_TIMINGS <VIDIOC_G_DV_TIMINGS>`
74 parameter was unsuitable. 80 parameter was unsuitable.
75 81
76 ENODATA 82 ENODATA
77 Digital video timings are not supported fo 83 Digital video timings are not supported for this input or output.
78 84
79 EBUSY 85 EBUSY
80 The device is busy and therefore can not c 86 The device is busy and therefore can not change the timings.
81 87
82 EPERM 88 EPERM
83 ``VIDIOC_SUBDEV_S_DV_TIMINGS`` has been ca 89 ``VIDIOC_SUBDEV_S_DV_TIMINGS`` has been called on a read-only subdevice.
84 90
85 .. c:type:: v4l2_bt_timings !! 91 .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
86 <<
87 .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm <<
88 92
89 .. cssclass:: longtable !! 93 .. c:type:: v4l2_bt_timings
90 94
91 .. flat-table:: struct v4l2_bt_timings 95 .. flat-table:: struct v4l2_bt_timings
92 :header-rows: 0 96 :header-rows: 0
93 :stub-columns: 0 97 :stub-columns: 0
94 :widths: 1 1 2 98 :widths: 1 1 2
95 99
96 * - __u32 100 * - __u32
97 - ``width`` 101 - ``width``
98 - Width of the active video in pixels. 102 - Width of the active video in pixels.
99 * - __u32 103 * - __u32
100 - ``height`` 104 - ``height``
101 - Height of the active video frame in li 105 - Height of the active video frame in lines. So for interlaced
102 formats the height of the active video 106 formats the height of the active video in each field is
103 ``height``/2. 107 ``height``/2.
104 * - __u32 108 * - __u32
105 - ``interlaced`` 109 - ``interlaced``
106 - Progressive (``V4L2_DV_PROGRESSIVE``) 110 - Progressive (``V4L2_DV_PROGRESSIVE``) or interlaced (``V4L2_DV_INTERLACED``).
107 * - __u32 111 * - __u32
108 - ``polarities`` 112 - ``polarities``
109 - This is a bit mask that defines polari 113 - This is a bit mask that defines polarities of sync signals. bit 0
110 (``V4L2_DV_VSYNC_POS_POL``) is for ver 114 (``V4L2_DV_VSYNC_POS_POL``) is for vertical sync polarity and bit
111 1 (``V4L2_DV_HSYNC_POS_POL``) is for h 115 1 (``V4L2_DV_HSYNC_POS_POL``) is for horizontal sync polarity. If
112 the bit is set (1) it is positive pola 116 the bit is set (1) it is positive polarity and if is cleared (0),
113 it is negative polarity. 117 it is negative polarity.
114 * - __u64 118 * - __u64
115 - ``pixelclock`` 119 - ``pixelclock``
116 - Pixel clock in Hz. Ex. 74.25MHz->74250 120 - Pixel clock in Hz. Ex. 74.25MHz->74250000
117 * - __u32 121 * - __u32
118 - ``hfrontporch`` 122 - ``hfrontporch``
119 - Horizontal front porch in pixels 123 - Horizontal front porch in pixels
120 * - __u32 124 * - __u32
121 - ``hsync`` 125 - ``hsync``
122 - Horizontal sync length in pixels 126 - Horizontal sync length in pixels
123 * - __u32 127 * - __u32
124 - ``hbackporch`` 128 - ``hbackporch``
125 - Horizontal back porch in pixels 129 - Horizontal back porch in pixels
126 * - __u32 130 * - __u32
127 - ``vfrontporch`` 131 - ``vfrontporch``
128 - Vertical front porch in lines. For int 132 - Vertical front porch in lines. For interlaced formats this refers
129 to the odd field (aka field 1). 133 to the odd field (aka field 1).
130 * - __u32 134 * - __u32
131 - ``vsync`` 135 - ``vsync``
132 - Vertical sync length in lines. For int 136 - Vertical sync length in lines. For interlaced formats this refers
133 to the odd field (aka field 1). 137 to the odd field (aka field 1).
134 * - __u32 138 * - __u32
135 - ``vbackporch`` 139 - ``vbackporch``
136 - Vertical back porch in lines. For inte 140 - Vertical back porch in lines. For interlaced formats this refers
137 to the odd field (aka field 1). 141 to the odd field (aka field 1).
138 * - __u32 142 * - __u32
139 - ``il_vfrontporch`` 143 - ``il_vfrontporch``
140 - Vertical front porch in lines for the 144 - Vertical front porch in lines for the even field (aka field 2) of
141 interlaced field formats. Must be 0 fo 145 interlaced field formats. Must be 0 for progressive formats.
142 * - __u32 146 * - __u32
143 - ``il_vsync`` 147 - ``il_vsync``
144 - Vertical sync length in lines for the 148 - Vertical sync length in lines for the even field (aka field 2) of
145 interlaced field formats. Must be 0 fo 149 interlaced field formats. Must be 0 for progressive formats.
146 * - __u32 150 * - __u32
147 - ``il_vbackporch`` 151 - ``il_vbackporch``
148 - Vertical back porch in lines for the e 152 - Vertical back porch in lines for the even field (aka field 2) of
149 interlaced field formats. Must be 0 fo 153 interlaced field formats. Must be 0 for progressive formats.
150 * - __u32 154 * - __u32
151 - ``standards`` 155 - ``standards``
152 - The video standard(s) this format belo 156 - The video standard(s) this format belongs to. This will be filled
153 in by the driver. Applications must se 157 in by the driver. Applications must set this to 0. See
154 :ref:`dv-bt-standards` for a list of s 158 :ref:`dv-bt-standards` for a list of standards.
155 * - __u32 159 * - __u32
156 - ``flags`` 160 - ``flags``
157 - Several flags giving more information 161 - Several flags giving more information about the format. See
158 :ref:`dv-bt-flags` for a description o 162 :ref:`dv-bt-flags` for a description of the flags.
159 * - struct :c:type:`v4l2_fract` 163 * - struct :c:type:`v4l2_fract`
160 - ``picture_aspect`` 164 - ``picture_aspect``
161 - The picture aspect if the pixels are n 165 - The picture aspect if the pixels are not square. Only valid if the
162 ``V4L2_DV_FL_HAS_PICTURE_ASPECT`` flag 166 ``V4L2_DV_FL_HAS_PICTURE_ASPECT`` flag is set.
163 * - __u8 167 * - __u8
164 - ``cea861_vic`` 168 - ``cea861_vic``
165 - The Video Identification Code accordin 169 - The Video Identification Code according to the CEA-861 standard.
166 Only valid if the ``V4L2_DV_FL_HAS_CEA 170 Only valid if the ``V4L2_DV_FL_HAS_CEA861_VIC`` flag is set.
167 * - __u8 171 * - __u8
168 - ``hdmi_vic`` 172 - ``hdmi_vic``
169 - The Video Identification Code accordin 173 - The Video Identification Code according to the HDMI standard.
170 Only valid if the ``V4L2_DV_FL_HAS_HDM 174 Only valid if the ``V4L2_DV_FL_HAS_HDMI_VIC`` flag is set.
171 * - __u8 175 * - __u8
172 - ``reserved[46]`` 176 - ``reserved[46]``
173 - Reserved for future extensions. Driver 177 - Reserved for future extensions. Drivers and applications must set
174 the array to zero. 178 the array to zero.
175 179
176 .. tabularcolumns:: |p{3.5cm}|p{3.5cm}|p{7.0cm !! 180
>> 181 .. tabularcolumns:: |p{3.5cm}|p{3.5cm}|p{7.0cm}|p{3.5cm}|
177 182
178 .. c:type:: v4l2_dv_timings 183 .. c:type:: v4l2_dv_timings
179 184
180 .. flat-table:: struct v4l2_dv_timings 185 .. flat-table:: struct v4l2_dv_timings
181 :header-rows: 0 186 :header-rows: 0
182 :stub-columns: 0 187 :stub-columns: 0
183 :widths: 1 1 2 188 :widths: 1 1 2
184 189
185 * - __u32 190 * - __u32
186 - ``type`` 191 - ``type``
187 - Type of DV timings as listed in :ref:` 192 - Type of DV timings as listed in :ref:`dv-timing-types`.
188 * - union { 193 * - union {
189 - (anonymous) 194 - (anonymous)
190 * - struct :c:type:`v4l2_bt_timings` 195 * - struct :c:type:`v4l2_bt_timings`
191 - ``bt`` 196 - ``bt``
192 - Timings defined by BT.656/1120 specifi 197 - Timings defined by BT.656/1120 specifications
193 * - __u32 198 * - __u32
194 - ``reserved``\ [32] 199 - ``reserved``\ [32]
195 - 200 -
196 * - } 201 * - }
197 - 202 -
198 203
199 .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm !! 204 .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
200 205
201 .. _dv-timing-types: 206 .. _dv-timing-types:
202 207
203 .. flat-table:: DV Timing types 208 .. flat-table:: DV Timing types
204 :header-rows: 0 209 :header-rows: 0
205 :stub-columns: 0 210 :stub-columns: 0
206 :widths: 1 1 2 211 :widths: 1 1 2
207 212
208 * - Timing type 213 * - Timing type
209 - value 214 - value
210 - Description 215 - Description
211 * - 216 * -
212 - 217 -
213 - 218 -
214 * - ``V4L2_DV_BT_656_1120`` 219 * - ``V4L2_DV_BT_656_1120``
215 - 0 220 - 0
216 - BT.656/1120 timings 221 - BT.656/1120 timings
217 222
218 .. tabularcolumns:: |p{6.5cm}|p{11.0cm}| !! 223 .. tabularcolumns:: |p{4.5cm}|p{12.8cm}|
219 <<
220 .. cssclass:: longtable <<
221 224
222 .. _dv-bt-standards: 225 .. _dv-bt-standards:
223 226
224 .. flat-table:: DV BT Timing standards 227 .. flat-table:: DV BT Timing standards
225 :header-rows: 0 228 :header-rows: 0
226 :stub-columns: 0 229 :stub-columns: 0
227 230
228 * - Timing standard 231 * - Timing standard
229 - Description 232 - Description
230 * - ``V4L2_DV_BT_STD_CEA861`` 233 * - ``V4L2_DV_BT_STD_CEA861``
231 - The timings follow the CEA-861 Digital 234 - The timings follow the CEA-861 Digital TV Profile standard
232 * - ``V4L2_DV_BT_STD_DMT`` 235 * - ``V4L2_DV_BT_STD_DMT``
233 - The timings follow the VESA Discrete M 236 - The timings follow the VESA Discrete Monitor Timings standard
234 * - ``V4L2_DV_BT_STD_CVT`` 237 * - ``V4L2_DV_BT_STD_CVT``
235 - The timings follow the VESA Coordinate 238 - The timings follow the VESA Coordinated Video Timings standard
236 * - ``V4L2_DV_BT_STD_GTF`` 239 * - ``V4L2_DV_BT_STD_GTF``
237 - The timings follow the VESA Generalize 240 - The timings follow the VESA Generalized Timings Formula standard
238 * - ``V4L2_DV_BT_STD_SDI`` 241 * - ``V4L2_DV_BT_STD_SDI``
239 - The timings follow the SDI Timings sta 242 - The timings follow the SDI Timings standard.
240 There are no horizontal syncs/porches 243 There are no horizontal syncs/porches at all in this format.
241 Total blanking timings must be set in 244 Total blanking timings must be set in hsync or vsync fields only.
242 245
243 .. tabularcolumns:: |p{7.7cm}|p{9.8cm}| !! 246 .. tabularcolumns:: |p{7.0cm}|p{10.5cm}|
244 <<
245 .. cssclass:: longtable <<
246 247
247 .. _dv-bt-flags: 248 .. _dv-bt-flags:
248 249
249 .. flat-table:: DV BT Timing flags 250 .. flat-table:: DV BT Timing flags
250 :header-rows: 0 251 :header-rows: 0
251 :stub-columns: 0 252 :stub-columns: 0
252 253
253 * - Flag 254 * - Flag
254 - Description 255 - Description
255 * - ``V4L2_DV_FL_REDUCED_BLANKING`` 256 * - ``V4L2_DV_FL_REDUCED_BLANKING``
256 - CVT/GTF specific: the timings use redu 257 - CVT/GTF specific: the timings use reduced blanking (CVT) or the
257 'Secondary GTF' curve (GTF). In both c 258 'Secondary GTF' curve (GTF). In both cases the horizontal and/or
258 vertical blanking intervals are reduce 259 vertical blanking intervals are reduced, allowing a higher
259 resolution over the same bandwidth. Th 260 resolution over the same bandwidth. This is a read-only flag,
260 applications must not set this. 261 applications must not set this.
261 * - ``V4L2_DV_FL_CAN_REDUCE_FPS`` 262 * - ``V4L2_DV_FL_CAN_REDUCE_FPS``
262 - CEA-861 specific: set for CEA-861 form 263 - CEA-861 specific: set for CEA-861 formats with a framerate that is
263 a multiple of six. These formats can b 264 a multiple of six. These formats can be optionally played at 1 /
264 1.001 speed to be compatible with 60 H 265 1.001 speed to be compatible with 60 Hz based standards such as
265 NTSC and PAL-M that use a framerate of 266 NTSC and PAL-M that use a framerate of 29.97 frames per second. If
266 the transmitter can't generate such fr 267 the transmitter can't generate such frequencies, then the flag
267 will also be cleared. This is a read-o 268 will also be cleared. This is a read-only flag, applications must
268 not set this. 269 not set this.
269 * - ``V4L2_DV_FL_REDUCED_FPS`` 270 * - ``V4L2_DV_FL_REDUCED_FPS``
270 - CEA-861 specific: only valid for video 271 - CEA-861 specific: only valid for video transmitters or video
271 receivers that have the ``V4L2_DV_FL_C 272 receivers that have the ``V4L2_DV_FL_CAN_DETECT_REDUCED_FPS``
272 set. This flag is cleared otherwise. I 273 set. This flag is cleared otherwise. It is also only valid for
273 formats with the ``V4L2_DV_FL_CAN_REDU 274 formats with the ``V4L2_DV_FL_CAN_REDUCE_FPS`` flag set, for other
274 formats the flag will be cleared by th 275 formats the flag will be cleared by the driver.
275 276
276 If the application sets this flag for 277 If the application sets this flag for a transmitter, then the
277 pixelclock used to set up the transmit 278 pixelclock used to set up the transmitter is divided by 1.001 to
278 make it compatible with NTSC framerate 279 make it compatible with NTSC framerates. If the transmitter can't
279 generate such frequencies, then the fl 280 generate such frequencies, then the flag will be cleared.
280 281
281 If a video receiver detects that the f 282 If a video receiver detects that the format uses a reduced framerate,
282 then it will set this flag to signal t 283 then it will set this flag to signal this to the application.
283 * - ``V4L2_DV_FL_HALF_LINE`` 284 * - ``V4L2_DV_FL_HALF_LINE``
284 - Specific to interlaced formats: if set 285 - Specific to interlaced formats: if set, then the vertical
285 frontporch of field 1 (aka the odd fie 286 frontporch of field 1 (aka the odd field) is really one half-line
286 longer and the vertical backporch of f 287 longer and the vertical backporch of field 2 (aka the even field)
287 is really one half-line shorter, so ea 288 is really one half-line shorter, so each field has exactly the
288 same number of half-lines. Whether hal 289 same number of half-lines. Whether half-lines can be detected or
289 used depends on the hardware. 290 used depends on the hardware.
290 * - ``V4L2_DV_FL_IS_CE_VIDEO`` 291 * - ``V4L2_DV_FL_IS_CE_VIDEO``
291 - If set, then this is a Consumer Electr 292 - If set, then this is a Consumer Electronics (CE) video format.
292 Such formats differ from other formats 293 Such formats differ from other formats (commonly called IT
293 formats) in that if R'G'B' encoding is 294 formats) in that if R'G'B' encoding is used then by default the
294 R'G'B' values use limited range (i.e. 295 R'G'B' values use limited range (i.e. 16-235) as opposed to full
295 range (i.e. 0-255). All formats define 296 range (i.e. 0-255). All formats defined in CEA-861 except for the
296 640x480p59.94 format are CE formats. 297 640x480p59.94 format are CE formats.
297 * - ``V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE`` 298 * - ``V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE``
298 - Some formats like SMPTE-125M have an i 299 - Some formats like SMPTE-125M have an interlaced signal with a odd
299 total height. For these formats, if th 300 total height. For these formats, if this flag is set, the first
300 field has the extra line. Else, it is 301 field has the extra line. Else, it is the second field.
301 * - ``V4L2_DV_FL_HAS_PICTURE_ASPECT`` 302 * - ``V4L2_DV_FL_HAS_PICTURE_ASPECT``
302 - If set, then the picture_aspect field 303 - If set, then the picture_aspect field is valid. Otherwise assume that
303 the pixels are square, so the picture 304 the pixels are square, so the picture aspect ratio is the same as the
304 width to height ratio. 305 width to height ratio.
305 * - ``V4L2_DV_FL_HAS_CEA861_VIC`` 306 * - ``V4L2_DV_FL_HAS_CEA861_VIC``
306 - If set, then the cea861_vic field is v 307 - If set, then the cea861_vic field is valid and contains the Video
307 Identification Code as per the CEA-861 308 Identification Code as per the CEA-861 standard.
308 * - ``V4L2_DV_FL_HAS_HDMI_VIC`` 309 * - ``V4L2_DV_FL_HAS_HDMI_VIC``
309 - If set, then the hdmi_vic field is val 310 - If set, then the hdmi_vic field is valid and contains the Video
310 Identification Code as per the HDMI st 311 Identification Code as per the HDMI standard (HDMI Vendor Specific
311 InfoFrame). 312 InfoFrame).
312 * - ``V4L2_DV_FL_CAN_DETECT_REDUCED_FPS`` 313 * - ``V4L2_DV_FL_CAN_DETECT_REDUCED_FPS``
313 - CEA-861 specific: only valid for video 314 - CEA-861 specific: only valid for video receivers, the flag is
314 cleared by transmitters. 315 cleared by transmitters.
315 If set, then the hardware can detect t 316 If set, then the hardware can detect the difference between
316 regular framerates and framerates redu 317 regular framerates and framerates reduced by 1000/1001. E.g.:
317 60 vs 59.94 Hz, 30 vs 29.97 Hz or 24 v 318 60 vs 59.94 Hz, 30 vs 29.97 Hz or 24 vs 23.976 Hz.
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