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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
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<title>GstVideoDither: GStreamer Base Plugins 1.0 Library Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-GstVideoDither.description" class="shortcut">Description</a></span>
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<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="gstreamer-video.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
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<div class="refentry">
<a name="gst-plugins-base-libs-GstVideoDither"></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-GstVideoDither.top_of_page"></a>GstVideoDither</span></h2>
<p>GstVideoDither — Utility object for dithering and quantizing lines of video</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDither.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-GstVideoDither.html#gst-video-dither-free" title="gst_video_dither_free ()">gst_video_dither_free</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-GstVideoDither.html#gst-video-dither-line" title="gst_video_dither_line ()">gst_video_dither_line</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDither" title="GstVideoDither"><span class="returnvalue">GstVideoDither</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDither.html#gst-video-dither-new" title="gst_video_dither_new ()">gst_video_dither_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDither.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-GstVideoDither.html#GstVideoDither" title="GstVideoDither">GstVideoDither</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDitherFlags" title="enum GstVideoDitherFlags">GstVideoDitherFlags</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDitherMethod" title="enum GstVideoDitherMethod">GstVideoDitherMethod</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDither.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/video/video-dither.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDither.description"></a><h2>Description</h2>
<p>GstVideoDither provides implementations of several dithering algorithms
that can be applied to lines of video pixels to quantize and dither them.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDither.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-video-dither-free"></a><h3>gst_video_dither_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_dither_free (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDither" title="GstVideoDither"><span class="type">GstVideoDither</span></a> *dither</code></em>);</pre>
<p>Free <em class="parameter"><code>dither</code></em>
</p>
<div class="refsect3">
<a name="id-1.2.15.8.7.2.5"></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>dither</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDither" title="GstVideoDither"><span class="type">GstVideoDither</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-dither-line"></a><h3>gst_video_dither_line ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_dither_line (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDither" title="GstVideoDither"><span class="type">GstVideoDither</span></a> *dither</code></em>,
                       <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> line</code></em>,
                       <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> x</code></em>,
                       <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> y</code></em>,
                       <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> width</code></em>);</pre>
<p>Dither <em class="parameter"><code>width</code></em>
 pixels starting from offset <em class="parameter"><code>x</code></em>
 in <em class="parameter"><code>line</code></em>
 using <em class="parameter"><code>dither</code></em>
.</p>
<p><em class="parameter"><code>y</code></em>
 is the line number of <em class="parameter"><code>line</code></em>
 in the output image.</p>
<div class="refsect3">
<a name="id-1.2.15.8.7.3.6"></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>dither</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDither" title="GstVideoDither"><span class="type">GstVideoDither</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>line</p></td>
<td class="parameter_description"><p>pointer to the pixels of the line</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>x coordinate</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>y coordinate</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>the width</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-dither-new"></a><h3>gst_video_dither_new ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDither" title="GstVideoDither"><span class="returnvalue">GstVideoDither</span></a> *
gst_video_dither_new (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDitherMethod" title="enum GstVideoDitherMethod"><span class="type">GstVideoDitherMethod</span></a> method</code></em>,
                      <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDitherFlags" title="enum GstVideoDitherFlags"><span class="type">GstVideoDitherFlags</span></a> flags</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/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> quantizer[GST_VIDEO_MAX_COMPONENTS]</code></em>,
                      <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> width</code></em>);</pre>
<p>Make a new dither object for dithering lines of <em class="parameter"><code>format</code></em>
 using the
algorithm described by <em class="parameter"><code>method</code></em>
.</p>
<p>Each component will be quantized to a multiple of <em class="parameter"><code>quantizer</code></em>
. Better
performance is achived when <em class="parameter"><code>quantizer</code></em>
 is a power of 2.</p>
<p><em class="parameter"><code>width</code></em>
 is the width of the lines that this ditherer will handle.</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="id-1.2.15.8.7.4.8"></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-GstVideoDither.html#GstVideoDitherMethod" title="enum GstVideoDitherMethod"><span class="type">GstVideoDitherMethod</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 <a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDitherFlags" title="enum GstVideoDitherFlags"><span class="type">GstVideoDitherFlags</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></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>quantizer</p></td>
<td class="parameter_description"><p>quantizer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>the width of the lines</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.8.7.4.9"></a><h4>Returns</h4>
<p> a new <a class="link" href="gst-plugins-base-libs-GstVideoDither.html#GstVideoDither" title="GstVideoDither"><span class="type">GstVideoDither</span></a></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDither.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstVideoDither"></a><h3>GstVideoDither</h3>
<pre class="programlisting">typedef struct _GstVideoDither GstVideoDither;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoDitherFlags"></a><h3>enum GstVideoDitherFlags</h3>
<p>Extra flags that influence the result from <a class="link" href="gst-plugins-base-libs-GstVideoChroma.html#gst-video-chroma-resample-new" title="gst_video_chroma_resample_new ()"><code class="function">gst_video_chroma_resample_new()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.15.8.8.3.4"></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-DITHER-FLAG-NONE:CAPS"></a>GST_VIDEO_DITHER_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-DITHER-FLAG-INTERLACED:CAPS"></a>GST_VIDEO_DITHER_FLAG_INTERLACED</p></td>
<td class="enum_member_description">
<p>the input is interlaced</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-VIDEO-DITHER-FLAG-QUANTIZE:CAPS"></a>GST_VIDEO_DITHER_FLAG_QUANTIZE</p></td>
<td class="enum_member_description">
<p>quantize values in addition to adding dither.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoDitherMethod"></a><h3>enum GstVideoDitherMethod</h3>
<p>Different dithering methods to use.</p>
<div class="refsect3">
<a name="id-1.2.15.8.8.4.4"></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-DITHER-NONE:CAPS"></a>GST_VIDEO_DITHER_NONE</p></td>
<td class="enum_member_description">
<p>no dithering</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-VIDEO-DITHER-VERTERR:CAPS"></a>GST_VIDEO_DITHER_VERTERR</p></td>
<td class="enum_member_description">
<p>propagate rounding errors downwards</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-VIDEO-DITHER-FLOYD-STEINBERG:CAPS"></a>GST_VIDEO_DITHER_FLOYD_STEINBERG</p></td>
<td class="enum_member_description">
<p>Dither with floyd-steinberg error diffusion</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-VIDEO-DITHER-SIERRA-LITE:CAPS"></a>GST_VIDEO_DITHER_SIERRA_LITE</p></td>
<td class="enum_member_description">
<p>Dither with Sierra Lite error diffusion</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-VIDEO-DITHER-BAYER:CAPS"></a>GST_VIDEO_DITHER_BAYER</p></td>
<td class="enum_member_description">
<p>ordered dither using a bayer pattern</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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