diff options
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-g-selection.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-g-selection.xml | 106 |
1 files changed, 55 insertions, 51 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-selection.xml b/Documentation/DocBook/media/v4l/vidioc-g-selection.xml index a9d36e0..bb04eff 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-selection.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-selection.xml @@ -58,43 +58,43 @@ <para>The ioctls are used to query and configure selection rectangles.</para> -<para> To query the cropping (composing) rectangle set <structfield> -&v4l2-selection;::type </structfield> to the respective buffer type. Do not -use multiplanar buffers. Use <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE +<para> To query the cropping (composing) rectangle set &v4l2-selection; +<structfield> type </structfield> field to the respective buffer type. +Do not use multiplanar buffers. Use <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE </constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE </constant>. Use <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE </constant>. The next step is -setting <structfield> &v4l2-selection;::target </structfield> to value -<constant> V4L2_SEL_TGT_CROP_ACTIVE </constant> (<constant> +setting the value of &v4l2-selection; <structfield>target</structfield> field +to <constant> V4L2_SEL_TGT_CROP_ACTIVE </constant> (<constant> V4L2_SEL_TGT_COMPOSE_ACTIVE </constant>). Please refer to table <xref linkend="v4l2-sel-target" /> or <xref linkend="selection-api" /> for additional -targets. Fields <structfield> &v4l2-selection;::flags </structfield> and -<structfield> &v4l2-selection;::reserved </structfield> are ignored and they -must be filled with zeros. The driver fills the rest of the structure or +targets. The <structfield>flags</structfield> and <structfield>reserved +</structfield> fields of &v4l2-selection; are ignored and they must be filled +with zeros. The driver fills the rest of the structure or returns &EINVAL; if incorrect buffer type or target was used. If cropping (composing) is not supported then the active rectangle is not mutable and it is -always equal to the bounds rectangle. Finally, structure <structfield> -&v4l2-selection;::r </structfield> is filled with the current cropping +always equal to the bounds rectangle. Finally, the &v4l2-rect; +<structfield>r</structfield> rectangle is filled with the current cropping (composing) coordinates. The coordinates are expressed in driver-dependent units. The only exception are rectangles for images in raw formats, whose coordinates are always expressed in pixels. </para> -<para> To change the cropping (composing) rectangle set <structfield> -&v4l2-selection;::type </structfield> to the respective buffer type. Do not +<para> To change the cropping (composing) rectangle set the &v4l2-selection; +<structfield>type</structfield> field to the respective buffer type. Do not use multiplanar buffers. Use <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE </constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE </constant>. Use <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE </constant>. The next step is -setting <structfield> &v4l2-selection;::target </structfield> to value -<constant> V4L2_SEL_TGT_CROP_ACTIVE </constant> (<constant> +setting the value of &v4l2-selection; <structfield>target</structfield> to +<constant>V4L2_SEL_TGT_CROP_ACTIVE</constant> (<constant> V4L2_SEL_TGT_COMPOSE_ACTIVE </constant>). Please refer to table <xref linkend="v4l2-sel-target" /> or <xref linkend="selection-api" /> for additional -targets. Set desired active area into the field <structfield> -&v4l2-selection;::r </structfield>. Field <structfield> -&v4l2-selection;::reserved </structfield> is ignored and must be filled with -zeros. The driver may adjust the rectangle coordinates. An application may -introduce constraints to control rounding behaviour. Set the field -<structfield> &v4l2-selection;::flags </structfield> to one of values: +targets. The &v4l2-rect; <structfield>r</structfield> rectangle need to be +set to the desired active area. Field &v4l2-selection; <structfield> reserved +</structfield> is ignored and must be filled with zeros. The driver may adjust +coordinates of the requested rectangle. An application may +introduce constraints to control rounding behaviour. The &v4l2-selection; +<structfield>flags</structfield> field must be set to one of the following: <itemizedlist> <listitem> @@ -129,7 +129,7 @@ and vertical offset and sizes are chosen according to following priority: <orderedlist> <listitem> - <para>Satisfy constraints from <structfield>&v4l2-selection;::flags</structfield>.</para> + <para>Satisfy constraints from &v4l2-selection; <structfield>flags</structfield>.</para> </listitem> <listitem> <para>Adjust width, height, left, and top to hardware limits and alignments.</para> @@ -145,7 +145,7 @@ and vertical offset and sizes are chosen according to following priority: </listitem> </orderedlist> -On success the field <structfield> &v4l2-selection;::r </structfield> contains +On success the &v4l2-rect; <structfield>r</structfield> field contains the adjusted rectangle. When the parameters are unsuitable the application may modify the cropping (composing) or image parameters and repeat the cycle until satisfactory parameters have been negotiated. If constraints flags have to be @@ -162,38 +162,38 @@ exist no rectangle </emphasis> that satisfies the constraints.</para> <tbody valign="top"> <row> <entry><constant>V4L2_SEL_TGT_CROP_ACTIVE</constant></entry> - <entry>0</entry> - <entry>area that is currently cropped by hardware</entry> + <entry>0x0000</entry> + <entry>The area that is currently cropped by hardware.</entry> </row> <row> <entry><constant>V4L2_SEL_TGT_CROP_DEFAULT</constant></entry> - <entry>1</entry> - <entry>suggested cropping rectangle that covers the "whole picture"</entry> + <entry>0x0001</entry> + <entry>Suggested cropping rectangle that covers the "whole picture".</entry> </row> <row> <entry><constant>V4L2_SEL_TGT_CROP_BOUNDS</constant></entry> - <entry>2</entry> - <entry>limits for the cropping rectangle</entry> + <entry>0x0002</entry> + <entry>Limits for the cropping rectangle.</entry> </row> <row> <entry><constant>V4L2_SEL_TGT_COMPOSE_ACTIVE</constant></entry> - <entry>256</entry> - <entry>area to which data are composed by hardware</entry> + <entry>0x0100</entry> + <entry>The area to which data is composed by hardware.</entry> </row> <row> <entry><constant>V4L2_SEL_TGT_COMPOSE_DEFAULT</constant></entry> - <entry>257</entry> - <entry>suggested composing rectangle that covers the "whole picture"</entry> + <entry>0x0101</entry> + <entry>Suggested composing rectangle that covers the "whole picture".</entry> </row> <row> <entry><constant>V4L2_SEL_TGT_COMPOSE_BOUNDS</constant></entry> - <entry>258</entry> - <entry>limits for the composing rectangle</entry> + <entry>0x0102</entry> + <entry>Limits for the composing rectangle.</entry> </row> <row> <entry><constant>V4L2_SEL_TGT_COMPOSE_PADDED</constant></entry> - <entry>259</entry> - <entry>the active area and all padding pixels that are inserted or modified by the hardware</entry> + <entry>0x0103</entry> + <entry>The active area and all padding pixels that are inserted or modified by hardware.</entry> </row> </tbody> </tgroup> @@ -209,12 +209,14 @@ exist no rectangle </emphasis> that satisfies the constraints.</para> <row> <entry><constant>V4L2_SEL_FLAG_GE</constant></entry> <entry>0x00000001</entry> - <entry>indicate that adjusted rectangle must contain a rectangle from <structfield>&v4l2-selection;::r</structfield></entry> + <entry>Indicates that the adjusted rectangle must contain the original + &v4l2-selection; <structfield>r</structfield> rectangle.</entry> </row> <row> <entry><constant>V4L2_SEL_FLAG_LE</constant></entry> <entry>0x00000002</entry> - <entry>indicate that adjusted rectangle must be inside a rectangle from <structfield>&v4l2-selection;::r</structfield></entry> + <entry>Indicates that the adjusted rectangle must be inside the original + &v4l2-rect; <structfield>r</structfield> rectangle.</entry> </row> </tbody> </tgroup> @@ -245,27 +247,29 @@ exist no rectangle </emphasis> that satisfies the constraints.</para> <row> <entry>__u32</entry> <entry><structfield>type</structfield></entry> - <entry>Type of the buffer (from &v4l2-buf-type;)</entry> + <entry>Type of the buffer (from &v4l2-buf-type;).</entry> </row> <row> <entry>__u32</entry> <entry><structfield>target</structfield></entry> - <entry>used to select between <link linkend="v4l2-sel-target"> cropping and composing rectangles </link></entry> + <entry>Used to select between <link linkend="v4l2-sel-target"> cropping + and composing rectangles</link>.</entry> </row> <row> <entry>__u32</entry> <entry><structfield>flags</structfield></entry> - <entry>control over coordinates adjustments, refer to <link linkend="v4l2-sel-flags">selection flags</link></entry> + <entry>Flags controlling the selection rectangle adjustments, refer to + <link linkend="v4l2-sel-flags">selection flags</link>.</entry> </row> <row> <entry>&v4l2-rect;</entry> <entry><structfield>r</structfield></entry> - <entry>selection rectangle</entry> + <entry>The selection rectangle.</entry> </row> <row> <entry>__u32</entry> <entry><structfield>reserved[9]</structfield></entry> - <entry>Reserved fields for future use</entry> + <entry>Reserved fields for future use.</entry> </row> </tbody> </tgroup> @@ -278,24 +282,24 @@ exist no rectangle </emphasis> that satisfies the constraints.</para> <varlistentry> <term><errorcode>EINVAL</errorcode></term> <listitem> - <para>The buffer <structfield> &v4l2-selection;::type </structfield> -or <structfield> &v4l2-selection;::target </structfield> is not supported, or -the <structfield> &v4l2-selection;::flags </structfield> are invalid.</para> + <para>Given buffer type <structfield>type</structfield> or +the selection target <structfield>target</structfield> is not supported, +or the <structfield>flags</structfield> argument is not valid.</para> </listitem> </varlistentry> <varlistentry> <term><errorcode>ERANGE</errorcode></term> <listitem> - <para>it is not possible to adjust a rectangle <structfield> -&v4l2-selection;::r </structfield> that satisfies all contraints from -<structfield> &v4l2-selection;::flags </structfield>.</para> + <para>It is not possible to adjust &v4l2-rect; <structfield> +r</structfield> rectangle to satisfy all contraints given in the +<structfield>flags</structfield> argument.</para> </listitem> </varlistentry> <varlistentry> <term><errorcode>EBUSY</errorcode></term> <listitem> - <para>it is not possible to apply change of selection rectangle at the moment. -Usually because streaming is in progress.</para> + <para>It is not possible to apply change of the selection rectangle +at the moment. Usually because streaming is in progress.</para> </listitem> </varlistentry> </variablelist> |
