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| <tr><td colspan="5" class="shortcuts"> |
| <a href="#gst-plugins-base-plugins-videoscale.synopsis" class="shortcut">Top</a> |
| | |
| <a href="#gst-plugins-base-plugins-videoscale.description" class="shortcut">Description</a> |
| | |
| <a href="#gst-plugins-base-plugins-videoscale.object-hierarchy" class="shortcut">Object Hierarchy</a> |
| | |
| <a href="#gst-plugins-base-plugins-videoscale.properties" class="shortcut">Properties</a> |
| </td></tr> |
| </table> |
| <div class="refentry"> |
| <a name="gst-plugins-base-plugins-videoscale"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-videoscale.top_of_page"></a>videoscale</span></h2> |
| <p>videoscale — Resizes video</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsynopsisdiv"> |
| <a name="gst-plugins-base-plugins-videoscale.synopsis"></a><h2>Synopsis</h2> |
| <a name="GstVideoScale"></a><pre class="synopsis">struct <a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScale-struct" title="struct GstVideoScale">GstVideoScale</a>; |
| enum <a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScaleMethod" title="enum GstVideoScaleMethod">GstVideoScaleMethod</a>; |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-videoscale.object-hierarchy"></a><h2>Object Hierarchy</h2> |
| <pre class="synopsis"> |
| <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a> |
| +----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> |
| +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a> |
| +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a> |
| +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseTransform.html">GstBaseTransform</a> |
| +----<a href="../gst-plugins-base-libs-1.0/gst-plugins-base-libs-gstvideofilter.html#GstVideoFilter">GstVideoFilter</a> |
| +----GstVideoScale |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-videoscale.properties"></a><h2>Properties</h2> |
| <pre class="synopsis"> |
| "<a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScale--method" title='The "method" property'>method</a>" <a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScaleMethod" title="enum GstVideoScaleMethod"><span class="type">GstVideoScaleMethod</span></a> : Read / Write |
| "<a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScale--add-borders" title='The "add-borders" property'>add-borders</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write |
| "<a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScale--dither" title='The "dither" property'>dither</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScale--envelope" title='The "envelope" property'>envelope</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScale--sharpen" title='The "sharpen" property'>sharpen</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScale--sharpness" title='The "sharpness" property'>sharpness</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-videoscale.description"></a><h2>Description</h2> |
| <p> |
| This element resizes video frames. By default the element will try to |
| negotiate to the same size on the source and sinkpad so that no scaling |
| is needed. It is therefore safe to insert this element in a pipeline to |
| get more robust behaviour without any cost if no scaling is needed. |
| </p> |
| <p> |
| This element supports a wide range of color spaces including various YUV and |
| RGB formats and is therefore generally able to operate anywhere in a |
| pipeline. |
| </p> |
| <p> |
| </p> |
| <div class="refsect2"> |
| <a name="idp13963808"></a><h3>Example pipelines</h3> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1</pre></td> |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch <span class="gtkdoc opt">-</span>v filesrc location<span class="gtkdoc opt">=</span>videotestsrc<span class="gtkdoc opt">.</span>ogg <span class="gtkdoc opt">!</span> oggdemux <span class="gtkdoc opt">!</span> theoradec <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> videoscale <span class="gtkdoc opt">!</span> ximagesink</pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| Decode an Ogg/Theora and display the video using ximagesink. Since |
| ximagesink cannot perform scaling, the video scaling will be performed by |
| videoscale when you resize the video window. |
| To create the test Ogg/Theora file refer to the documentation of theoraenc. |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1</pre></td> |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch <span class="gtkdoc opt">-</span>v filesrc location<span class="gtkdoc opt">=</span>videotestsrc<span class="gtkdoc opt">.</span>ogg <span class="gtkdoc opt">!</span> oggdemux <span class="gtkdoc opt">!</span> theoradec <span class="gtkdoc opt">!</span> videoscale <span class="gtkdoc opt">!</span> video<span class="gtkdoc opt">/</span>x<span class="gtkdoc opt">-</span>raw<span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">=</span><span class="number">50</span> <span class="gtkdoc opt">!</span> xvimagesink</pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| Decode an Ogg/Theora and display the video using xvimagesink with a width |
| of 50. |
| </div> |
| <p> |
| </p> |
| <p> |
| Last reviewed on 2006-03-02 (0.10.4) |
| </p> |
| <div class="refsynopsisdiv"> |
| <h2>Synopsis</h2> |
| <div class="refsect2"> |
| <a name="idp13968208"></a><h3>Element Information</h3> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">plugin</span></p></td> |
| <td> |
| <a class="link" href="gst-plugins-base-plugins-plugin-videoscale.html#plugin-videoscale">videoscale</a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term">author</span></p></td> |
| <td>Wim Taymans <wim.taymans@chello.be></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">class</span></p></td> |
| <td>Filter/Converter/Video/Scaler</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="idp13975680"></a><h3>Element Pads</h3> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">name</span></p></td> |
| <td>sink</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">direction</span></p></td> |
| <td>sink</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">presence</span></p></td> |
| <td>always</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">details</span></p></td> |
| <td>video/x-raw, format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, GRAY8, GRAY16_BE, GRAY16_LE, v308, Y800, Y16, RGB16, RGB15, ARGB64, AYUV64, NV12 }, width=(int)[ 1, 32767 ], height=(int)[ 1, 32767 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> |
| </tr> |
| </tbody> |
| </table></div> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">name</span></p></td> |
| <td>src</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">direction</span></p></td> |
| <td>source</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">presence</span></p></td> |
| <td>always</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">details</span></p></td> |
| <td>video/x-raw, format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, GRAY8, GRAY16_BE, GRAY16_LE, v308, Y800, Y16, RGB16, RGB15, ARGB64, AYUV64, NV12 }, width=(int)[ 1, 32767 ], height=(int)[ 1, 32767 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-videoscale.details"></a><h2>Details</h2> |
| <div class="refsect2"> |
| <a name="GstVideoScale-struct"></a><h3>struct GstVideoScale</h3> |
| <pre class="programlisting">struct GstVideoScale;</pre> |
| <p> |
| Opaque data structure |
| </p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoScaleMethod"></a><h3>enum GstVideoScaleMethod</h3> |
| <pre class="programlisting">typedef enum { |
| GST_VIDEO_SCALE_NEAREST, |
| GST_VIDEO_SCALE_BILINEAR, |
| GST_VIDEO_SCALE_4TAP, |
| GST_VIDEO_SCALE_LANCZOS |
| } GstVideoScaleMethod; |
| </pre> |
| <p> |
| The videoscale method to use. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><a name="GST-VIDEO-SCALE-NEAREST:CAPS"></a><span class="term"><code class="literal">GST_VIDEO_SCALE_NEAREST</code></span></p></td> |
| <td>use nearest neighbour scaling (fast and ugly) |
| </td> |
| </tr> |
| <tr> |
| <td><p><a name="GST-VIDEO-SCALE-BILINEAR:CAPS"></a><span class="term"><code class="literal">GST_VIDEO_SCALE_BILINEAR</code></span></p></td> |
| <td>use bilinear scaling (slower but prettier). |
| </td> |
| </tr> |
| <tr> |
| <td><p><a name="GST-VIDEO-SCALE-4TAP:CAPS"></a><span class="term"><code class="literal">GST_VIDEO_SCALE_4TAP</code></span></p></td> |
| <td>use a 4-tap filter for scaling (slow). |
| </td> |
| </tr> |
| <tr> |
| <td><p><a name="GST-VIDEO-SCALE-LANCZOS:CAPS"></a><span class="term"><code class="literal">GST_VIDEO_SCALE_LANCZOS</code></span></p></td> |
| <td>use a multitap Lanczos filter for scaling (slow). |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-videoscale.property-details"></a><h2>Property Details</h2> |
| <div class="refsect2"> |
| <a name="GstVideoScale--method"></a><h3>The <code class="literal">"method"</code> property</h3> |
| <pre class="programlisting"> "method" <a class="link" href="gst-plugins-base-plugins-videoscale.html#GstVideoScaleMethod" title="enum GstVideoScaleMethod"><span class="type">GstVideoScaleMethod</span></a> : Read / Write</pre> |
| <p>method.</p> |
| <p>Default value: Bilinear</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoScale--add-borders"></a><h3>The <code class="literal">"add-borders"</code> property</h3> |
| <pre class="programlisting"> "add-borders" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write</pre> |
| <p>Add black borders if necessary to keep the display aspect ratio.</p> |
| <p>Default value: FALSE</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoScale--dither"></a><h3>The <code class="literal">"dither"</code> property</h3> |
| <pre class="programlisting"> "dither" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write / Construct</pre> |
| <p>Add dither (only used for Lanczos method).</p> |
| <p>Default value: FALSE</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoScale--envelope"></a><h3>The <code class="literal">"envelope"</code> property</h3> |
| <pre class="programlisting"> "envelope" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct</pre> |
| <p>Size of filter envelope.</p> |
| <p>Allowed values: [0,5]</p> |
| <p>Default value: 2</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoScale--sharpen"></a><h3>The <code class="literal">"sharpen"</code> property</h3> |
| <pre class="programlisting"> "sharpen" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct</pre> |
| <p>Sharpening.</p> |
| <p>Allowed values: [0,1]</p> |
| <p>Default value: 0</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoScale--sharpness"></a><h3>The <code class="literal">"sharpness"</code> property</h3> |
| <pre class="programlisting"> "sharpness" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct</pre> |
| <p>Sharpness of filter.</p> |
| <p>Allowed values: [0,2]</p> |
| <p>Default value: 1</p> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-plugins-videoscale.see-also"></a><h2>See Also</h2> |
| videorate, videoconvert |
| </div> |
| </div> |
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