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| <a href="#gst-plugins-base-libs-GstVideoResampler.description" class="shortcut">Description</a></span> |
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| <div class="refentry"> |
| <a name="gst-plugins-base-libs-GstVideoResampler"></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-GstVideoResampler.top_of_page"></a>GstVideoResampler</span></h2> |
| <p>GstVideoResampler — Utility structure for resampler information</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoResampler.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-GstVideoResampler.html#gst-video-resampler-clear" title="gst_video_resampler_clear ()">gst_video_resampler_clear</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#gst-video-resampler-init" title="gst_video_resampler_init ()">gst_video_resampler_init</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoResampler.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">struct</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler">GstVideoResampler</a></td> |
| </tr> |
| <tr> |
| <td class="datatype_keyword">enum</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerFlags" title="enum GstVideoResamplerFlags">GstVideoResamplerFlags</a></td> |
| </tr> |
| <tr> |
| <td class="datatype_keyword">enum</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerMethod" title="enum GstVideoResamplerMethod">GstVideoResamplerMethod</a></td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-CUBIC-B:CAPS" title="GST_VIDEO_RESAMPLER_OPT_CUBIC_B">GST_VIDEO_RESAMPLER_OPT_CUBIC_B</a></td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-CUBIC-C:CAPS" title="GST_VIDEO_RESAMPLER_OPT_CUBIC_C">GST_VIDEO_RESAMPLER_OPT_CUBIC_C</a></td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-ENVELOPE:CAPS" title="GST_VIDEO_RESAMPLER_OPT_ENVELOPE">GST_VIDEO_RESAMPLER_OPT_ENVELOPE</a></td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-MAX-TAPS:CAPS" title="GST_VIDEO_RESAMPLER_OPT_MAX_TAPS">GST_VIDEO_RESAMPLER_OPT_MAX_TAPS</a></td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-SHARPEN:CAPS" title="GST_VIDEO_RESAMPLER_OPT_SHARPEN">GST_VIDEO_RESAMPLER_OPT_SHARPEN</a></td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-SHARPNESS:CAPS" title="GST_VIDEO_RESAMPLER_OPT_SHARPNESS">GST_VIDEO_RESAMPLER_OPT_SHARPNESS</a></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoResampler.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gst/video/video-resampler.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoResampler.description"></a><h2>Description</h2> |
| <p><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> is a structure which holds the information |
| required to perform various kinds of resampling filtering.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoResampler.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="gst-video-resampler-clear"></a><h3>gst_video_resampler_clear ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_video_resampler_clear (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> *resampler</code></em>);</pre> |
| <p>Clear a previously initialized <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> <em class="parameter"><code>resampler</code></em> |
| .</p> |
| <div class="refsect3"> |
| <a name="gst-video-resampler-clear.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>resampler</p></td> |
| <td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a></p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: 1.6</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-video-resampler-init"></a><h3>gst_video_resampler_init ()</h3> |
| <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> |
| gst_video_resampler_init (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> *resampler</code></em>, |
| <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-GstVideoResampler.html#GstVideoResamplerFlags" title="enum GstVideoResamplerFlags"><span class="type">GstVideoResamplerFlags</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_phases</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#gdouble"><span class="type">gdouble</span></a> shift</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> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-GstVideoResampler.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstVideoResampler"></a><h3>struct GstVideoResampler</h3> |
| <pre class="programlisting">struct GstVideoResampler { |
| gint in_size; |
| gint out_size; |
| guint max_taps; |
| guint n_phases; |
| guint32 *offset; |
| guint32 *phase; |
| guint32 *n_taps; |
| gdouble *taps; |
| }; |
| </pre> |
| <p>A structure holding resampler information.</p> |
| <div class="refsect3"> |
| <a name="GstVideoResampler.members"></a><h4>Members</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="300px" class="struct_members_name"> |
| <col class="struct_members_description"> |
| <col width="200px" class="struct_members_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoResampler.in-size"></a>in_size</code></em>;</p></td> |
| <td class="struct_member_description"><p>the input size</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoResampler.out-size"></a>out_size</code></em>;</p></td> |
| <td class="struct_member_description"><p>the output size</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstVideoResampler.max-taps"></a>max_taps</code></em>;</p></td> |
| <td class="struct_member_description"><p>the maximum number of taps</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstVideoResampler.n-phases"></a>n_phases</code></em>;</p></td> |
| <td class="struct_member_description"><p>the number of phases</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *<em class="structfield"><code><a name="GstVideoResampler.offset"></a>offset</code></em>;</p></td> |
| <td class="struct_member_description"><p>array with the source offset for each output element</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *<em class="structfield"><code><a name="GstVideoResampler.phase"></a>phase</code></em>;</p></td> |
| <td class="struct_member_description"><p>array with the phase to use for each output element</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *<em class="structfield"><code><a name="GstVideoResampler.n-taps"></a>n_taps</code></em>;</p></td> |
| <td class="struct_member_description"><p>array with new number of taps for each phase</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *<em class="structfield"><code><a name="GstVideoResampler.taps"></a>taps</code></em>;</p></td> |
| <td class="struct_member_description"><p>the taps for all phases</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: 1.6</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoResamplerFlags"></a><h3>enum GstVideoResamplerFlags</h3> |
| <p>Different resampler flags.</p> |
| <div class="refsect3"> |
| <a name="GstVideoResamplerFlags.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-RESAMPLER-FLAG-NONE:CAPS"></a>GST_VIDEO_RESAMPLER_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-RESAMPLER-FLAG-HALF-TAPS:CAPS"></a>GST_VIDEO_RESAMPLER_FLAG_HALF_TAPS</p></td> |
| <td class="enum_member_description"> |
| <p>when no taps are given, half the |
| number of calculated taps. This can be used when making scalers |
| for the different fields of an interlaced picture. Since 1.10</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: 1.6</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoResamplerMethod"></a><h3>enum GstVideoResamplerMethod</h3> |
| <p>Different subsampling and upsampling methods</p> |
| <div class="refsect3"> |
| <a name="GstVideoResamplerMethod.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-RESAMPLER-METHOD-NEAREST:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_NEAREST</p></td> |
| <td class="enum_member_description"> |
| <p>Duplicates the samples when |
| upsampling and drops when downsampling</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-LINEAR:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_LINEAR</p></td> |
| <td class="enum_member_description"> |
| <p>Uses linear interpolation to reconstruct |
| missing samples and averaging to downsample</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-CUBIC:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_CUBIC</p></td> |
| <td class="enum_member_description"> |
| <p>Uses cubic interpolation</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-SINC:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_SINC</p></td> |
| <td class="enum_member_description"> |
| <p>Uses sinc interpolation</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-LANCZOS:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</p></td> |
| <td class="enum_member_description"> |
| <p>Uses lanczos interpolation</p> |
| </td> |
| <td class="enum_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: 1.6</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GST-VIDEO-RESAMPLER-OPT-CUBIC-B:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_CUBIC_B</h3> |
| <pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_CUBIC_B "GstVideoResampler.cubic-b" |
| </pre> |
| <p>G_TYPE_DOUBLE, B parameter of the cubic filter. The B |
| parameter controls the bluriness. Values between 0.0 and |
| 2.0 are accepted. 1/3 is the default.</p> |
| <p>Below are some values of popular filters: |
| B C |
| Hermite 0.0 0.0 |
| Spline 1.0 0.0 |
| Catmull-Rom 0.0 1/2 |
| Mitchell 1/3 1/3 |
| Robidoux 0.3782 0.3109 |
| Robidoux |
| Sharp 0.2620 0.3690 |
| Robidoux |
| Soft 0.6796 0.1602</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GST-VIDEO-RESAMPLER-OPT-CUBIC-C:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_CUBIC_C</h3> |
| <pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_CUBIC_C "GstVideoResampler.cubic-c" |
| </pre> |
| <p>G_TYPE_DOUBLE, C parameter of the cubic filter. The C |
| parameter controls the Keys alpha value. Values between 0.0 and |
| 2.0 are accepted. 1/3 is the default.</p> |
| <p>See <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-CUBIC-B:CAPS" title="GST_VIDEO_RESAMPLER_OPT_CUBIC_B"><span class="type">GST_VIDEO_RESAMPLER_OPT_CUBIC_B</span></a> for some more common values</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GST-VIDEO-RESAMPLER-OPT-ENVELOPE:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_ENVELOPE</h3> |
| <pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_ENVELOPE "GstVideoResampler.envelope" |
| </pre> |
| <p>G_TYPE_DOUBLE, specifies the size of filter envelope for |
| <em class="parameter"><code>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</code></em> |
| . values are clamped between |
| 1.0 and 5.0. 2.0 is the default.</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GST-VIDEO-RESAMPLER-OPT-MAX-TAPS:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_MAX_TAPS</h3> |
| <pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_MAX_TAPS "GstVideoResampler.max-taps" |
| </pre> |
| <p>G_TYPE_INT, limits the maximum number of taps to use. |
| 16 is the default.</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GST-VIDEO-RESAMPLER-OPT-SHARPEN:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_SHARPEN</h3> |
| <pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_SHARPEN "GstVideoResampler.sharpen" |
| </pre> |
| <p>G_TYPE_DOUBLE, specifies sharpening of the filter for |
| <em class="parameter"><code>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</code></em> |
| . values are clamped between |
| 0.0 and 1.0. 0.0 is the default.</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GST-VIDEO-RESAMPLER-OPT-SHARPNESS:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_SHARPNESS</h3> |
| <pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_SHARPNESS "GstVideoResampler.sharpness" |
| </pre> |
| <p>G_TYPE_DOUBLE, specifies sharpness of the filter for |
| <em class="parameter"><code>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</code></em> |
| . values are clamped between |
| 0.5 and 1.5. 1.0 is the default.</p> |
| </div> |
| </div> |
| </div> |
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