About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / DocBook / media / v4l / vidioc-dv-timings-cap.xml




Custom Search

Based on kernel version 3.16. Page generated on 2014-08-06 21:39 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	    <note>
53	      <title>Experimental</title>
54	      <para>This is an <link linkend="experimental"> experimental </link>
55	      interface and may change in the future.</para>
56	    </note>
57	
58	    <para>To query the capabilities of the DV receiver/transmitter applications
59	can call the <constant>VIDIOC_DV_TIMINGS_CAP</constant> ioctl on a video node
60	and the driver will fill in the structure. Note that drivers may return
61	different values after switching the video input or output.</para>
62	
63	    <para>When implemented by the driver DV capabilities of subdevices can be
64	queried by calling the <constant>VIDIOC_SUBDEV_DV_TIMINGS_CAP</constant> ioctl
65	directly on a subdevice node. The capabilities are specific to inputs (for DV
66	receivers) or outputs (for DV transmitters), applications must specify the
67	desired pad number in the &v4l2-dv-timings-cap; <structfield>pad</structfield>
68	field. Attempts to query capabilities on a pad that doesn't support them will
69	return an &EINVAL;.</para>
70	
71	    <table pgwide="1" frame="none" id="v4l2-bt-timings-cap">
72	      <title>struct <structname>v4l2_bt_timings_cap</structname></title>
73	      <tgroup cols="3">
74		&cs-str;
75		<tbody valign="top">
76		  <row>
77		    <entry>__u32</entry>
78		    <entry><structfield>min_width</structfield></entry>
79		    <entry>Minimum width of the active video in pixels.</entry>
80		  </row>
81		  <row>
82		    <entry>__u32</entry>
83		    <entry><structfield>max_width</structfield></entry>
84		    <entry>Maximum width of the active video in pixels.</entry>
85		  </row>
86		  <row>
87		    <entry>__u32</entry>
88		    <entry><structfield>min_height</structfield></entry>
89		    <entry>Minimum height of the active video in lines.</entry>
90		  </row>
91		  <row>
92		    <entry>__u32</entry>
93		    <entry><structfield>max_height</structfield></entry>
94		    <entry>Maximum height of the active video in lines.</entry>
95		  </row>
96		  <row>
97		    <entry>__u64</entry>
98		    <entry><structfield>min_pixelclock</structfield></entry>
99		    <entry>Minimum pixelclock frequency in Hz.</entry>
100		  </row>
101		  <row>
102		    <entry>__u64</entry>
103		    <entry><structfield>max_pixelclock</structfield></entry>
104		    <entry>Maximum pixelclock frequency in Hz.</entry>
105		  </row>
106		  <row>
107		    <entry>__u32</entry>
108		    <entry><structfield>standards</structfield></entry>
109		    <entry>The video standard(s) supported by the hardware.
110		    See <xref linkend="dv-bt-standards"/> for a list of standards.</entry>
111		  </row>
112		  <row>
113		    <entry>__u32</entry>
114		    <entry><structfield>capabilities</structfield></entry>
115		    <entry>Several flags giving more information about the capabilities.
116		    See <xref linkend="dv-bt-cap-capabilities"/> for a description of the flags.
117		    </entry>
118		  </row>
119		  <row>
120		    <entry>__u32</entry>
121		    <entry><structfield>reserved</structfield>[16]</entry>
122		    <entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
123		  </row>
124		</tbody>
125	      </tgroup>
126	    </table>
127	
128	    <table pgwide="1" frame="none" id="v4l2-dv-timings-cap">
129	      <title>struct <structname>v4l2_dv_timings_cap</structname></title>
130	      <tgroup cols="4">
131		&cs-str;
132		<tbody valign="top">
133		  <row>
134		    <entry>__u32</entry>
135		    <entry><structfield>type</structfield></entry>
136		    <entry>Type of DV timings as listed in <xref linkend="dv-timing-types"/>.</entry>
137		  </row>
138		  <row>
139		    <entry>__u32</entry>
140		    <entry><structfield>pad</structfield></entry>
141		    <entry>Pad number as reported by the media controller API. This field
142		    is only used when operating on a subdevice node. When operating on a
143		    video node applications must set this field to zero.</entry>
144		  </row>
145		  <row>
146		    <entry>__u32</entry>
147		    <entry><structfield>reserved</structfield>[2]</entry>
148		    <entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
149		  </row>
150		  <row>
151		    <entry>union</entry>
152		    <entry><structfield></structfield></entry>
153		    <entry></entry>
154		  </row>
155		  <row>
156		    <entry></entry>
157		    <entry>&v4l2-bt-timings-cap;</entry>
158		    <entry><structfield>bt</structfield></entry>
159		    <entry>BT.656/1120 timings capabilities of the hardware.</entry>
160		  </row>
161		  <row>
162		    <entry></entry>
163		    <entry>__u32</entry>
164		    <entry><structfield>raw_data</structfield>[32]</entry>
165		    <entry></entry>
166		  </row>
167		</tbody>
168	      </tgroup>
169	    </table>
170	
171	    <table pgwide="1" frame="none" id="dv-bt-cap-capabilities">
172	      <title>DV BT Timing capabilities</title>
173	      <tgroup cols="2">
174		&cs-str;
175		<tbody valign="top">
176		  <row>
177		    <entry>Flag</entry>
178		    <entry>Description</entry>
179		  </row>
180		  <row>
181		    <entry></entry>
182		    <entry></entry>
183		  </row>
184		  <row>
185		    <entry>V4L2_DV_BT_CAP_INTERLACED</entry>
186		    <entry>Interlaced formats are supported.
187		    </entry>
188		  </row>
189		  <row>
190		    <entry>V4L2_DV_BT_CAP_PROGRESSIVE</entry>
191		    <entry>Progressive formats are supported.
192		    </entry>
193		  </row>
194		  <row>
195		    <entry>V4L2_DV_BT_CAP_REDUCED_BLANKING</entry>
196		    <entry>CVT/GTF specific: the timings can make use of reduced blanking (CVT)
197	or the 'Secondary GTF' curve (GTF).
198		    </entry>
199		  </row>
200		  <row>
201		    <entry>V4L2_DV_BT_CAP_CUSTOM</entry>
202		    <entry>Can support non-standard timings, i.e. timings not belonging to the
203	standards set in the <structfield>standards</structfield> field.
204		    </entry>
205		  </row>
206		</tbody>
207	      </tgroup>
208	    </table>
209	  </refsect1>
210	
211	  <refsect1>
212	    &return-value;
213	  </refsect1>
214	</refentry>
215	
216	<!--
217	Local Variables:
218	mode: sgml
219	sgml-parent-document: "v4l2.sgml"
220	indent-tabs-mode: nil
221	End:
222	-->
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.