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1<refentry id="vidioc-g-dv-timings">
2 <refmeta>
3 <refentrytitle>ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS</refentrytitle>
4 &manvol;
5 </refmeta>
6
7 <refnamediv>
8 <refname>VIDIOC_G_DV_TIMINGS</refname>
9 <refname>VIDIOC_S_DV_TIMINGS</refname>
10 <refpurpose>Get or set custom DV timings for input or output</refpurpose>
11 </refnamediv>
12
13 <refsynopsisdiv>
14 <funcsynopsis>
15 <funcprototype>
16 <funcdef>int <function>ioctl</function></funcdef>
17 <paramdef>int <parameter>fd</parameter></paramdef>
18 <paramdef>int <parameter>request</parameter></paramdef>
19 <paramdef>&v4l2-dv-timings;
20*<parameter>argp</parameter></paramdef>
21 </funcprototype>
22 </funcsynopsis>
23 </refsynopsisdiv>
24
25 <refsect1>
26 <title>Arguments</title>
27
28 <variablelist>
29 <varlistentry>
30 <term><parameter>fd</parameter></term>
31 <listitem>
32 <para>&fd;</para>
33 </listitem>
34 </varlistentry>
35 <varlistentry>
36 <term><parameter>request</parameter></term>
37 <listitem>
38 <para>VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS</para>
39 </listitem>
40 </varlistentry>
41 <varlistentry>
42 <term><parameter>argp</parameter></term>
43 <listitem>
44 <para></para>
45 </listitem>
46 </varlistentry>
47 </variablelist>
48 </refsect1>
49
50 <refsect1>
51 <title>Description</title>
52 <para>To set custom DV timings for the input or output, applications use the
53<constant>VIDIOC_S_DV_TIMINGS</constant> ioctl and to get the current custom timings,
54applications use the <constant>VIDIOC_G_DV_TIMINGS</constant> ioctl. The detailed timing
55information is filled in using the structure &v4l2-dv-timings;. These ioctls take
56a pointer to the &v4l2-dv-timings; structure as argument. If the ioctl is not supported
57or the timing values are not correct, the driver returns &EINVAL;.</para>
58 </refsect1>
59
60 <refsect1>
61 &return-value;
62
63 <variablelist>
64 <varlistentry>
65 <term><errorcode>EINVAL</errorcode></term>
66 <listitem>
67 <para>This ioctl is not supported, or the
68<constant>VIDIOC_S_DV_TIMINGS</constant> parameter was unsuitable.</para>
69 </listitem>
70 </varlistentry>
71 <varlistentry>
72 <term><errorcode>EBUSY</errorcode></term>
73 <listitem>
74 <para>The device is busy and therefore can not change the timings.</para>
75 </listitem>
76 </varlistentry>
77 </variablelist>
78
79 <table pgwide="1" frame="none" id="v4l2-bt-timings">
80 <title>struct <structname>v4l2_bt_timings</structname></title>
81 <tgroup cols="3">
82 &cs-str;
83 <tbody valign="top">
84 <row>
85 <entry>__u32</entry>
86 <entry><structfield>width</structfield></entry>
87 <entry>Width of the active video in pixels</entry>
88 </row>
89 <row>
90 <entry>__u32</entry>
91 <entry><structfield>height</structfield></entry>
92 <entry>Height of the active video in lines</entry>
93 </row>
94 <row>
95 <entry>__u32</entry>
96 <entry><structfield>interlaced</structfield></entry>
97 <entry>Progressive (0) or interlaced (1)</entry>
98 </row>
99 <row>
100 <entry>__u32</entry>
101 <entry><structfield>polarities</structfield></entry>
102 <entry>This is a bit mask that defines polarities of sync signals.
103bit 0 (V4L2_DV_VSYNC_POS_POL) is for vertical sync polarity and bit 1 (V4L2_DV_HSYNC_POS_POL) is for horizontal sync polarity. If the bit is set
104(1) it is positive polarity and if is cleared (0), it is negative polarity.</entry>
105 </row>
106 <row>
107 <entry>__u64</entry>
108 <entry><structfield>pixelclock</structfield></entry>
109 <entry>Pixel clock in Hz. Ex. 74.25MHz->74250000</entry>
110 </row>
111 <row>
112 <entry>__u32</entry>
113 <entry><structfield>hfrontporch</structfield></entry>
114 <entry>Horizontal front porch in pixels</entry>
115 </row>
116 <row>
117 <entry>__u32</entry>
118 <entry><structfield>hsync</structfield></entry>
119 <entry>Horizontal sync length in pixels</entry>
120 </row>
121 <row>
122 <entry>__u32</entry>
123 <entry><structfield>hbackporch</structfield></entry>
124 <entry>Horizontal back porch in pixels</entry>
125 </row>
126 <row>
127 <entry>__u32</entry>
128 <entry><structfield>vfrontporch</structfield></entry>
129 <entry>Vertical front porch in lines</entry>
130 </row>
131 <row>
132 <entry>__u32</entry>
133 <entry><structfield>vsync</structfield></entry>
134 <entry>Vertical sync length in lines</entry>
135 </row>
136 <row>
137 <entry>__u32</entry>
138 <entry><structfield>vbackporch</structfield></entry>
139 <entry>Vertical back porch in lines</entry>
140 </row>
141 <row>
142 <entry>__u32</entry>
143 <entry><structfield>il_vfrontporch</structfield></entry>
144 <entry>Vertical front porch in lines for bottom field of interlaced field formats</entry>
145 </row>
146 <row>
147 <entry>__u32</entry>
148 <entry><structfield>il_vsync</structfield></entry>
149 <entry>Vertical sync length in lines for bottom field of interlaced field formats</entry>
150 </row>
151 <row>
152 <entry>__u32</entry>
153 <entry><structfield>il_vbackporch</structfield></entry>
154 <entry>Vertical back porch in lines for bottom field of interlaced field formats</entry>
155 </row>
156 </tbody>
157 </tgroup>
158 </table>
159
160 <table pgwide="1" frame="none" id="v4l2-dv-timings">
161 <title>struct <structname>v4l2_dv_timings</structname></title>
162 <tgroup cols="4">
163 &cs-str;
164 <tbody valign="top">
165 <row>
166 <entry>__u32</entry>
167 <entry><structfield>type</structfield></entry>
168 <entry></entry>
169 <entry>Type of DV timings as listed in <xref linkend="dv-timing-types"/>.</entry>
170 </row>
171 <row>
172 <entry>union</entry>
173 <entry><structfield></structfield></entry>
174 <entry></entry>
175 </row>
176 <row>
177 <entry></entry>
178 <entry>&v4l2-bt-timings;</entry>
179 <entry><structfield>bt</structfield></entry>
180 <entry>Timings defined by BT.656/1120 specifications</entry>
181 </row>
182 <row>
183 <entry></entry>
184 <entry>__u32</entry>
185 <entry><structfield>reserved</structfield>[32]</entry>
186 <entry></entry>
187 </row>
188 </tbody>
189 </tgroup>
190 </table>
191
192 <table pgwide="1" frame="none" id="dv-timing-types">
193 <title>DV Timing types</title>
194 <tgroup cols="3">
195 &cs-str;
196 <tbody valign="top">
197 <row>
198 <entry>Timing type</entry>
199 <entry>value</entry>
200 <entry>Description</entry>
201 </row>
202 <row>
203 <entry></entry>
204 <entry></entry>
205 <entry></entry>
206 </row>
207 <row>
208 <entry>V4L2_DV_BT_656_1120</entry>
209 <entry>0</entry>
210 <entry>BT.656/1120 timings</entry>
211 </row>
212 </tbody>
213 </tgroup>
214 </table>
215 </refsect1>
216</refentry>
217
218<!--
219Local Variables:
220mode: sgml
221sgml-parent-document: "v4l2.sgml"
222indent-tabs-mode: nil
223End:
224-->
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