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225 lines
6.4 KiB
225 lines
6.4 KiB
15 years ago
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<refentry id="vidioc-g-dv-timings">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_G_DV_TIMINGS</refname>
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<refname>VIDIOC_S_DV_TIMINGS</refname>
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<refpurpose>Get or set custom DV timings for input or output</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>&v4l2-dv-timings;
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*<parameter>argp</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Arguments</title>
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<variablelist>
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<varlistentry>
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<term><parameter>fd</parameter></term>
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<listitem>
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<para>&fd;</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>request</parameter></term>
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<listitem>
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<para>VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>argp</parameter></term>
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<listitem>
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<para></para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>To set custom DV timings for the input or output, applications use the
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<constant>VIDIOC_S_DV_TIMINGS</constant> ioctl and to get the current custom timings,
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applications use the <constant>VIDIOC_G_DV_TIMINGS</constant> ioctl. The detailed timing
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information is filled in using the structure &v4l2-dv-timings;. These ioctls take
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a pointer to the &v4l2-dv-timings; structure as argument. If the ioctl is not supported
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or the timing values are not correct, the driver returns &EINVAL;.</para>
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</refsect1>
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<refsect1>
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&return-value;
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<variablelist>
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<varlistentry>
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<term><errorcode>EINVAL</errorcode></term>
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<listitem>
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<para>This ioctl is not supported, or the
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<constant>VIDIOC_S_DV_TIMINGS</constant> parameter was unsuitable.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>EBUSY</errorcode></term>
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<listitem>
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<para>The device is busy and therefore can not change the timings.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<table pgwide="1" frame="none" id="v4l2-bt-timings">
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<title>struct <structname>v4l2_bt_timings</structname></title>
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<tgroup cols="3">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>__u32</entry>
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<entry><structfield>width</structfield></entry>
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<entry>Width of the active video in pixels</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>height</structfield></entry>
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<entry>Height of the active video in lines</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>interlaced</structfield></entry>
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<entry>Progressive (0) or interlaced (1)</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>polarities</structfield></entry>
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<entry>This is a bit mask that defines polarities of sync signals.
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bit 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
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(1) it is positive polarity and if is cleared (0), it is negative polarity.</entry>
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</row>
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<row>
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<entry>__u64</entry>
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<entry><structfield>pixelclock</structfield></entry>
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<entry>Pixel clock in Hz. Ex. 74.25MHz->74250000</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>hfrontporch</structfield></entry>
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<entry>Horizontal front porch in pixels</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>hsync</structfield></entry>
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<entry>Horizontal sync length in pixels</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>hbackporch</structfield></entry>
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<entry>Horizontal back porch in pixels</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>vfrontporch</structfield></entry>
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<entry>Vertical front porch in lines</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>vsync</structfield></entry>
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<entry>Vertical sync length in lines</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>vbackporch</structfield></entry>
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<entry>Vertical back porch in lines</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>il_vfrontporch</structfield></entry>
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<entry>Vertical front porch in lines for bottom field of interlaced field formats</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>il_vsync</structfield></entry>
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<entry>Vertical sync length in lines for bottom field of interlaced field formats</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>il_vbackporch</structfield></entry>
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<entry>Vertical back porch in lines for bottom field of interlaced field formats</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table pgwide="1" frame="none" id="v4l2-dv-timings">
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<title>struct <structname>v4l2_dv_timings</structname></title>
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<tgroup cols="4">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>__u32</entry>
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<entry><structfield>type</structfield></entry>
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<entry></entry>
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<entry>Type of DV timings as listed in <xref linkend="dv-timing-types"/>.</entry>
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</row>
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<row>
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<entry>union</entry>
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<entry><structfield></structfield></entry>
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<entry></entry>
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</row>
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<row>
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<entry></entry>
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<entry>&v4l2-bt-timings;</entry>
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<entry><structfield>bt</structfield></entry>
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<entry>Timings defined by BT.656/1120 specifications</entry>
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</row>
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<row>
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<entry></entry>
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<entry>__u32</entry>
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<entry><structfield>reserved</structfield>[32]</entry>
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<entry></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table pgwide="1" frame="none" id="dv-timing-types">
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<title>DV Timing types</title>
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<tgroup cols="3">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>Timing type</entry>
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<entry>value</entry>
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<entry>Description</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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</row>
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<row>
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<entry>V4L2_DV_BT_656_1120</entry>
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<entry>0</entry>
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<entry>BT.656/1120 timings</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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</refentry>
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<!--
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Local Variables:
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mode: sgml
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sgml-parent-document: "v4l2.sgml"
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indent-tabs-mode: nil
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End:
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-->
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