Based on kernel version 4.7.2. Page generated on 2016-08-22 22:45 EST.
1 <refentry id="vidioc-dv-timings-cap"> 2 <refmeta> 3 <refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</refentrytitle> 4 &manvol; 5 </refmeta> 6 7 <refnamediv> 8 <refname>VIDIOC_DV_TIMINGS_CAP</refname> 9 <refname>VIDIOC_SUBDEV_DV_TIMINGS_CAP</refname> 10 <refpurpose>The capabilities of the Digital Video receiver/transmitter</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>struct v4l2_dv_timings_cap *<parameter>argp</parameter></paramdef> 20 </funcprototype> 21 </funcsynopsis> 22 </refsynopsisdiv> 23 24 <refsect1> 25 <title>Arguments</title> 26 27 <variablelist> 28 <varlistentry> 29 <term><parameter>fd</parameter></term> 30 <listitem> 31 <para>&fd;</para> 32 </listitem> 33 </varlistentry> 34 <varlistentry> 35 <term><parameter>request</parameter></term> 36 <listitem> 37 <para>VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</para> 38 </listitem> 39 </varlistentry> 40 <varlistentry> 41 <term><parameter>argp</parameter></term> 42 <listitem> 43 <para></para> 44 </listitem> 45 </varlistentry> 46 </variablelist> 47 </refsect1> 48 49 <refsect1> 50 <title>Description</title> 51 52 <para>To query the capabilities of the DV receiver/transmitter applications initialize the 53 <structfield>pad</structfield> field to 0, zero the reserved array of &v4l2-dv-timings-cap; 54 and call the <constant>VIDIOC_DV_TIMINGS_CAP</constant> ioctl on a video node 55 and the driver will fill in the structure. Note that drivers may return 56 different values after switching the video input or output.</para> 57 58 <para>When implemented by the driver DV capabilities of subdevices can be 59 queried by calling the <constant>VIDIOC_SUBDEV_DV_TIMINGS_CAP</constant> ioctl 60 directly on a subdevice node. The capabilities are specific to inputs (for DV 61 receivers) or outputs (for DV transmitters), applications must specify the 62 desired pad number in the &v4l2-dv-timings-cap; <structfield>pad</structfield> 63 field and zero the <structfield>reserved</structfield> array. Attempts to query 64 capabilities on a pad that doesn't support them will return an &EINVAL;.</para> 65 66 <table pgwide="1" frame="none" id="v4l2-bt-timings-cap"> 67 <title>struct <structname>v4l2_bt_timings_cap</structname></title> 68 <tgroup cols="3"> 69 &cs-str; 70 <tbody valign="top"> 71 <row> 72 <entry>__u32</entry> 73 <entry><structfield>min_width</structfield></entry> 74 <entry>Minimum width of the active video in pixels.</entry> 75 </row> 76 <row> 77 <entry>__u32</entry> 78 <entry><structfield>max_width</structfield></entry> 79 <entry>Maximum width of the active video in pixels.</entry> 80 </row> 81 <row> 82 <entry>__u32</entry> 83 <entry><structfield>min_height</structfield></entry> 84 <entry>Minimum height of the active video in lines.</entry> 85 </row> 86 <row> 87 <entry>__u32</entry> 88 <entry><structfield>max_height</structfield></entry> 89 <entry>Maximum height of the active video in lines.</entry> 90 </row> 91 <row> 92 <entry>__u64</entry> 93 <entry><structfield>min_pixelclock</structfield></entry> 94 <entry>Minimum pixelclock frequency in Hz.</entry> 95 </row> 96 <row> 97 <entry>__u64</entry> 98 <entry><structfield>max_pixelclock</structfield></entry> 99 <entry>Maximum pixelclock frequency in Hz.</entry> 100 </row> 101 <row> 102 <entry>__u32</entry> 103 <entry><structfield>standards</structfield></entry> 104 <entry>The video standard(s) supported by the hardware. 105 See <xref linkend="dv-bt-standards"/> for a list of standards.</entry> 106 </row> 107 <row> 108 <entry>__u32</entry> 109 <entry><structfield>capabilities</structfield></entry> 110 <entry>Several flags giving more information about the capabilities. 111 See <xref linkend="dv-bt-cap-capabilities"/> for a description of the flags. 112 </entry> 113 </row> 114 <row> 115 <entry>__u32</entry> 116 <entry><structfield>reserved</structfield>[16]</entry> 117 <entry>Reserved for future extensions. Drivers must set the array to zero.</entry> 118 </row> 119 </tbody> 120 </tgroup> 121 </table> 122 123 <table pgwide="1" frame="none" id="v4l2-dv-timings-cap"> 124 <title>struct <structname>v4l2_dv_timings_cap</structname></title> 125 <tgroup cols="4"> 126 &cs-str; 127 <tbody valign="top"> 128 <row> 129 <entry>__u32</entry> 130 <entry><structfield>type</structfield></entry> 131 <entry>Type of DV timings as listed in <xref linkend="dv-timing-types"/>.</entry> 132 </row> 133 <row> 134 <entry>__u32</entry> 135 <entry><structfield>pad</structfield></entry> 136 <entry>Pad number as reported by the media controller API. This field 137 is only used when operating on a subdevice node. When operating on a 138 video node applications must set this field to zero.</entry> 139 </row> 140 <row> 141 <entry>__u32</entry> 142 <entry><structfield>reserved</structfield>[2]</entry> 143 <entry>Reserved for future extensions. Drivers and applications must 144 set the array to zero.</entry> 145 </row> 146 <row> 147 <entry>union</entry> 148 <entry><structfield></structfield></entry> 149 <entry></entry> 150 </row> 151 <row> 152 <entry></entry> 153 <entry>&v4l2-bt-timings-cap;</entry> 154 <entry><structfield>bt</structfield></entry> 155 <entry>BT.656/1120 timings capabilities of the hardware.</entry> 156 </row> 157 <row> 158 <entry></entry> 159 <entry>__u32</entry> 160 <entry><structfield>raw_data</structfield>[32]</entry> 161 <entry></entry> 162 </row> 163 </tbody> 164 </tgroup> 165 </table> 166 167 <table pgwide="1" frame="none" id="dv-bt-cap-capabilities"> 168 <title>DV BT Timing capabilities</title> 169 <tgroup cols="2"> 170 &cs-str; 171 <tbody valign="top"> 172 <row> 173 <entry>Flag</entry> 174 <entry>Description</entry> 175 </row> 176 <row> 177 <entry></entry> 178 <entry></entry> 179 </row> 180 <row> 181 <entry>V4L2_DV_BT_CAP_INTERLACED</entry> 182 <entry>Interlaced formats are supported. 183 </entry> 184 </row> 185 <row> 186 <entry>V4L2_DV_BT_CAP_PROGRESSIVE</entry> 187 <entry>Progressive formats are supported. 188 </entry> 189 </row> 190 <row> 191 <entry>V4L2_DV_BT_CAP_REDUCED_BLANKING</entry> 192 <entry>CVT/GTF specific: the timings can make use of reduced blanking (CVT) 193 or the 'Secondary GTF' curve (GTF). 194 </entry> 195 </row> 196 <row> 197 <entry>V4L2_DV_BT_CAP_CUSTOM</entry> 198 <entry>Can support non-standard timings, i.e. timings not belonging to the 199 standards set in the <structfield>standards</structfield> field. 200 </entry> 201 </row> 202 </tbody> 203 </tgroup> 204 </table> 205 </refsect1> 206 207 <refsect1> 208 &return-value; 209 </refsect1> 210 </refentry>
