mirror of https://gitee.com/openkylin/linux.git
231 lines
6.7 KiB
XML
231 lines
6.7 KiB
XML
<refentry id="vidioc-enum-dv-presets">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_ENUM_DV_PRESETS</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_ENUM_DV_PRESETS</refname>
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<refpurpose>Enumerate supported Digital Video presets</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>struct v4l2_dv_enum_preset *<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_ENUM_DV_PRESETS</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 query the attributes of a DV preset, applications initialize the
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<structfield>index</structfield> field and zero the reserved array of &v4l2-dv-enum-preset;
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and call the <constant>VIDIOC_ENUM_DV_PRESETS</constant> ioctl with a pointer to this
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structure. Drivers fill the rest of the structure or return an
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&EINVAL; when the index is out of bounds. To enumerate all DV Presets supported,
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applications shall begin at index zero, incrementing by one until the
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driver returns <errorcode>EINVAL</errorcode>. Drivers may enumerate a
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different set of DV presets after switching the video input or
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output.</para>
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<table pgwide="1" frame="none" id="v4l2-dv-enum-preset">
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<title>struct <structname>v4l2_dv_enum_presets</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>index</structfield></entry>
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<entry>Number of the DV preset, set by the
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application.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>preset</structfield></entry>
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<entry>This field identifies one of the DV preset values listed in <xref linkend="v4l2-dv-presets-vals"/>.</entry>
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</row>
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<row>
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<entry>__u8</entry>
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<entry><structfield>name</structfield>[24]</entry>
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<entry>Name of the preset, a NUL-terminated ASCII string, for example: "720P-60", "1080I-60". This information is
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intended for the user.</entry>
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</row>
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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 for the DV preset.</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 for the DV preset.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>reserved</structfield>[4]</entry>
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<entry>Reserved for future extensions. Drivers must set the array to zero.</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-presets-vals">
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<title>struct <structname>DV Presets</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>Preset</entry>
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<entry>Preset 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_INVALID</entry>
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<entry>0</entry>
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<entry>Invalid preset value.</entry>
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</row>
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<row>
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<entry>V4L2_DV_480P59_94</entry>
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<entry>1</entry>
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<entry>720x480 progressive video at 59.94 fps as per BT.1362.</entry>
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</row>
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<row>
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<entry>V4L2_DV_576P50</entry>
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<entry>2</entry>
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<entry>720x576 progressive video at 50 fps as per BT.1362.</entry>
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</row>
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<row>
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<entry>V4L2_DV_720P24</entry>
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<entry>3</entry>
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<entry>1280x720 progressive video at 24 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_720P25</entry>
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<entry>4</entry>
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<entry>1280x720 progressive video at 25 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_720P30</entry>
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<entry>5</entry>
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<entry>1280x720 progressive video at 30 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_720P50</entry>
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<entry>6</entry>
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<entry>1280x720 progressive video at 50 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_720P59_94</entry>
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<entry>7</entry>
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<entry>1280x720 progressive video at 59.94 fps as per SMPTE 274M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_720P60</entry>
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<entry>8</entry>
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<entry>1280x720 progressive video at 60 fps as per SMPTE 274M/296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080I29_97</entry>
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<entry>9</entry>
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<entry>1920x1080 interlaced video at 29.97 fps as per BT.1120/SMPTE 274M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080I30</entry>
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<entry>10</entry>
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<entry>1920x1080 interlaced video at 30 fps as per BT.1120/SMPTE 274M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080I25</entry>
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<entry>11</entry>
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<entry>1920x1080 interlaced video at 25 fps as per BT.1120.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080I50</entry>
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<entry>12</entry>
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<entry>1920x1080 interlaced video at 50 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080I60</entry>
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<entry>13</entry>
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<entry>1920x1080 interlaced video at 60 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080P24</entry>
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<entry>14</entry>
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<entry>1920x1080 progressive video at 24 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080P25</entry>
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<entry>15</entry>
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<entry>1920x1080 progressive video at 25 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080P30</entry>
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<entry>16</entry>
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<entry>1920x1080 progressive video at 30 fps as per SMPTE 296M.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080P50</entry>
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<entry>17</entry>
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<entry>1920x1080 progressive video at 50 fps as per BT.1120.</entry>
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</row>
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<row>
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<entry>V4L2_DV_1080P60</entry>
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<entry>18</entry>
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<entry>1920x1080 progressive video at 60 fps as per BT.1120.</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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<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>The &v4l2-dv-enum-preset; <structfield>index</structfield>
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is out of bounds.</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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</refentry>
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