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| <div class="refentry"> |
| <a name="gst-plugins-base-libs-GstVideoScaler"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-GstVideoScaler.top_of_page"></a>GstVideoScaler</span></h2> |
| <p>GstVideoScaler — Utility object for rescaling video frames</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoScaler.functions"></a><h2>Functions</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="functions_return"> |
| <col class="functions_name"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#gst-video-scaler-2d" title="gst_video_scaler_2d ()">gst_video_scaler_2d</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="returnvalue">GstVideoScaler</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#gst-video-scaler-combine-packed-YUV" title="gst_video_scaler_combine_packed_YUV ()">gst_video_scaler_combine_packed_YUV</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#gst-video-scaler-free" title="gst_video_scaler_free ()">gst_video_scaler_free</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#gst-video-scaler-get-coeff" title="gst_video_scaler_get_coeff ()">gst_video_scaler_get_coeff</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#gst-video-scaler-horizontal" title="gst_video_scaler_horizontal ()">gst_video_scaler_horizontal</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="returnvalue">GstVideoScaler</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#gst-video-scaler-new" title="gst_video_scaler_new ()">gst_video_scaler_new</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#gst-video-scaler-vertical" title="gst_video_scaler_vertical ()">gst_video_scaler_vertical</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoScaler.other"></a><h2>Types and Values</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="name"> |
| <col class="description"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="datatype_keyword"> </td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler">GstVideoScaler</a></td> |
| </tr> |
| <tr> |
| <td class="datatype_keyword">enum</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScalerFlags" title="enum GstVideoScalerFlags">GstVideoScalerFlags</a></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoScaler.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gst/video/video-scaler.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoScaler.description"></a><h2>Description</h2> |
| <p><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> is a utility object for rescaling and resampling |
| video frames using various interpolation / sampling methods.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoScaler.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="gst-video-scaler-2d"></a><h3>gst_video_scaler_2d ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_video_scaler_2d (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *hscale</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *vscale</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> format</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> src</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> src_stride</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> dest</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> dest_stride</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> x</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> y</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> width</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> height</code></em>);</pre> |
| <p>Scale a rectangle of pixels in <em class="parameter"><code>src</code></em> |
| with <em class="parameter"><code>src_stride</code></em> |
| to <em class="parameter"><code>dest</code></em> |
| with |
| <em class="parameter"><code>dest_stride</code></em> |
| using the horizontal scaler <em class="parameter"><code>hscaler</code></em> |
| and the vertical |
| scaler <em class="parameter"><code>vscale</code></em> |
| .</p> |
| <p>One or both of <em class="parameter"><code>hscale</code></em> |
| and <em class="parameter"><code>vscale</code></em> |
| can be NULL to only perform scaling in |
| one dimension or do a copy without scaling.</p> |
| <p><em class="parameter"><code>x</code></em> |
| and <em class="parameter"><code>y</code></em> |
| are the coordinates in the destination image to process.</p> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-2d.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>hscale</p></td> |
| <td class="parameter_description"><p>a horzontal <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>vscale</p></td> |
| <td class="parameter_description"><p>a vertical <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>format</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> for <em class="parameter"><code>srcs</code></em> |
| and <em class="parameter"><code>dest</code></em> |
| </p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src</p></td> |
| <td class="parameter_description"><p>source pixels</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_stride</p></td> |
| <td class="parameter_description"><p>source pixels stride</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest</p></td> |
| <td class="parameter_description"><p>destination pixels</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_stride</p></td> |
| <td class="parameter_description"><p>destination pixels stride</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>x</p></td> |
| <td class="parameter_description"><p>the horizontal destination offset</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>y</p></td> |
| <td class="parameter_description"><p>the vertical destination offset</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>width</p></td> |
| <td class="parameter_description"><p>the number of output pixels to scale</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>height</p></td> |
| <td class="parameter_description"><p>the number of output lines to scale</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-scaler-combine-packed-YUV"></a><h3>gst_video_scaler_combine_packed_YUV ()</h3> |
| <pre class="programlisting"><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="returnvalue">GstVideoScaler</span></a> * |
| gst_video_scaler_combine_packed_YUV (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *y_scale</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *uv_scale</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> in_format</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> out_format</code></em>);</pre> |
| <p>Combine a scaler for Y and UV into one scaler for the packed <em class="parameter"><code>format</code></em> |
| .</p> |
| <p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-combine-packed-YUV.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>y_scale</p></td> |
| <td class="parameter_description"><p>a scaler for the Y component</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>uv_scale</p></td> |
| <td class="parameter_description"><p>a scaler for the U and V components</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>in_format</p></td> |
| <td class="parameter_description"><p>the input video format</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>out_format</p></td> |
| <td class="parameter_description"><p>the output video format</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-combine-packed-YUV.returns"></a><h4>Returns</h4> |
| <p> a new horizontal videoscaler for <em class="parameter"><code>format</code></em> |
| .</p> |
| </div> |
| <p class="since">Since: 1.6</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-scaler-free"></a><h3>gst_video_scaler_free ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_video_scaler_free (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *scale</code></em>);</pre> |
| <p>Free a previously allocated <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> <em class="parameter"><code>scale</code></em> |
| .</p> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-free.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody><tr> |
| <td class="parameter_name"><p>scale</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-scaler-get-coeff"></a><h3>gst_video_scaler_get_coeff ()</h3> |
| <pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> * |
| gst_video_scaler_get_coeff (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *scale</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> out_offset</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> *in_offset</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> *n_taps</code></em>);</pre> |
| <p>For a given pixel at <em class="parameter"><code>out_offset</code></em> |
| , get the first required input pixel at |
| <em class="parameter"><code>in_offset</code></em> |
| and the <em class="parameter"><code>n_taps</code></em> |
| filter coefficients.</p> |
| <p>Note that for interlaced content, <em class="parameter"><code>in_offset</code></em> |
| needs to be incremented with |
| 2 to get the next input line.</p> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-get-coeff.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>scale</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>out_offset</p></td> |
| <td class="parameter_description"><p>an output offset</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>in_offset</p></td> |
| <td class="parameter_description"><p>result input offset</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>n_taps</p></td> |
| <td class="parameter_description"><p>result n_taps</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-get-coeff.returns"></a><h4>Returns</h4> |
| <p> an array of <em class="parameter"><code>n_tap</code></em> |
| gdouble values with filter coefficients.</p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-scaler-horizontal"></a><h3>gst_video_scaler_horizontal ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_video_scaler_horizontal (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *scale</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> format</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> src</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> dest</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> dest_offset</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> width</code></em>);</pre> |
| <p>Horizontally scale the pixels in <em class="parameter"><code>src</code></em> |
| to <em class="parameter"><code>dest</code></em> |
| , starting from <em class="parameter"><code>dest_offset</code></em> |
| |
| for <em class="parameter"><code>width</code></em> |
| samples.</p> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-horizontal.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>scale</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>format</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> for <em class="parameter"><code>src</code></em> |
| and <em class="parameter"><code>dest</code></em> |
| </p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src</p></td> |
| <td class="parameter_description"><p>source pixels</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest</p></td> |
| <td class="parameter_description"><p>destination pixels</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_offset</p></td> |
| <td class="parameter_description"><p>the horizontal destination offset</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>width</p></td> |
| <td class="parameter_description"><p>the number of pixels to scale</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-scaler-new"></a><h3>gst_video_scaler_new ()</h3> |
| <pre class="programlisting"><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="returnvalue">GstVideoScaler</span></a> * |
| gst_video_scaler_new (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerMethod" title="enum GstVideoResamplerMethod"><span class="type">GstVideoResamplerMethod</span></a> method</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScalerFlags" title="enum GstVideoScalerFlags"><span class="type">GstVideoScalerFlags</span></a> flags</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> n_taps</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> in_size</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> out_size</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *options</code></em>);</pre> |
| <p>Make a new <em class="parameter"><code>method</code></em> |
| video scaler. <em class="parameter"><code>in_size</code></em> |
| source lines/pixels will |
| be scaled to <em class="parameter"><code>out_size</code></em> |
| destination lines/pixels.</p> |
| <p><em class="parameter"><code>n_taps</code></em> |
| specifies the amount of pixels to use from the source for one output |
| pixel. If n_taps is 0, this function chooses a good value automatically based |
| on the <em class="parameter"><code>method</code></em> |
| and <em class="parameter"><code>in_size</code></em> |
| /<em class="parameter"><code>out_size</code></em> |
| .</p> |
| <p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-new.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>method</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerMethod" title="enum GstVideoResamplerMethod"><span class="type">GstVideoResamplerMethod</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>flags</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScalerFlags" title="enum GstVideoScalerFlags"><span class="type">GstVideoScalerFlags</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>n_taps</p></td> |
| <td class="parameter_description"><p>number of taps to use</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>in_size</p></td> |
| <td class="parameter_description"><p>number of source elements</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>out_size</p></td> |
| <td class="parameter_description"><p>number of destination elements</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>options</p></td> |
| <td class="parameter_description"><p> extra options. </p></td> |
| <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-new.returns"></a><h4>Returns</h4> |
| <p> a <span class="type">GstVideoResample</span></p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-scaler-vertical"></a><h3>gst_video_scaler_vertical ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_video_scaler_vertical (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a> *scale</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> format</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> src_lines[]</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> dest</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> dest_offset</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> width</code></em>);</pre> |
| <p>Vertically combine <em class="parameter"><code>width</code></em> |
| pixels in the lines in <em class="parameter"><code>src_lines</code></em> |
| to <em class="parameter"><code>dest</code></em> |
| . |
| <em class="parameter"><code>dest</code></em> |
| is the location of the target line at <em class="parameter"><code>dest_offset</code></em> |
| and |
| <em class="parameter"><code>srcs</code></em> |
| are the input lines for <em class="parameter"><code>dest_offset</code></em> |
| , as obtained with |
| <code class="function">gst_video_scaler_get_info()</code>.</p> |
| <div class="refsect3"> |
| <a name="gst-video-scaler-vertical.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>scale</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoScaler.html#GstVideoScaler" title="GstVideoScaler"><span class="type">GstVideoScaler</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>format</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> for <em class="parameter"><code>srcs</code></em> |
| and <em class="parameter"><code>dest</code></em> |
| </p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_lines</p></td> |
| <td class="parameter_description"><p>source pixels lines</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest</p></td> |
| <td class="parameter_description"><p>destination pixels</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_offset</p></td> |
| <td class="parameter_description"><p>the vertical destination offset</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>width</p></td> |
| <td class="parameter_description"><p>the number of pixels to scale</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoScaler.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstVideoScaler"></a><h3>GstVideoScaler</h3> |
| <pre class="programlisting">typedef struct _GstVideoScaler GstVideoScaler;</pre> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoScalerFlags"></a><h3>enum GstVideoScalerFlags</h3> |
| <p>Different scale flags.</p> |
| <div class="refsect3"> |
| <a name="GstVideoScalerFlags.members"></a><h4>Members</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="300px" class="enum_members_name"> |
| <col class="enum_members_description"> |
| <col width="200px" class="enum_members_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-VIDEO-SCALER-FLAG-NONE:CAPS"></a>GST_VIDEO_SCALER_FLAG_NONE</p></td> |
| <td class="enum_member_description"> |
| <p>no flags</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-VIDEO-SCALER-FLAG-INTERLACED:CAPS"></a>GST_VIDEO_SCALER_FLAG_INTERLACED</p></td> |
| <td class="enum_member_description"> |
| <p>Set up a scaler for interlaced content</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="footer"> |
| <hr>Generated by GTK-Doc V1.25</div> |
| </body> |
| </html> |
